Comparing coingecko with farcaster

coingecko

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skills/coingecko/SKILL.md

CoinGecko Solana API Development Guide

A comprehensive guide for integrating CoinGecko's on-chain API for Solana. Access real-time token prices, DEX pool data, OHLCV charts, trade history, and market analytics across 1,700+ decentralized exchanges.

Overview

CoinGecko's Solana API provides:

Token Prices: Real-time prices by contract address (single or batch)
Pool Data: Liquidity pool information, trending pools, top pools
OHLCV Charts: Candlestick data for technical analysis
Trade History: Recent trades for any pool
DEX Discovery: List all DEXes operating on Solana
Search: Find pools by token name, symbol, or address
Megafilter: Advanced filtering across pools, tokens, and DEXes

Key Features

Feature	Description
250+ Networks	Multi-chain support including Solana
1,700+ DEXes	Raydium, Orca, Jupiter, Meteora, Pump.fun, etc.
15M+ Tokens	Comprehensive token coverage
Real-time Data	Updates every 10-30 seconds
Historical Data	OHLCV charts and trade history

Quick Start

Get Your API Key

Demo API (Free): Visit coingecko.com/en/api
Pro API (Paid): Visit coingecko.com/en/api/pricing

Environment Setup

# .env file
COINGECKO_API_KEY=your_api_key_here
COINGECKO_API_TYPE=demo  # or 'pro'

API Configuration

// Configuration for both Demo and Pro APIs
const CONFIG = {
  demo: {
    baseUrl: 'https://api.coingecko.com/api/v3/onchain',
    headerKey: 'x-cg-demo-api-key',
    rateLimit: 30, // calls per minute
  },
  pro: {
    baseUrl: 'https://pro-api.coingecko.com/api/v3/onchain',
    headerKey: 'x-cg-pro-api-key',
    rateLimit: 500, // calls per minute (varies by plan)
  },
};

const apiType = process.env.COINGECKO_API_TYPE || 'demo';
const apiKey = process.env.COINGECKO_API_KEY;

const BASE_URL = CONFIG[apiType].baseUrl;
const HEADER_KEY = CONFIG[apiType].headerKey;

// Solana network identifier
const NETWORK = 'solana';

Basic Token Price Fetch

async function getTokenPrice(tokenAddress: string): Promise<number | null> {
  const url = `${BASE_URL}/simple/networks/${NETWORK}/token_price/${tokenAddress}`;

  const response = await fetch(url, {
    headers: {
      [HEADER_KEY]: apiKey,
      'Accept': 'application/json',
    },
  });

  if (!response.ok) {
    throw new Error(`API error: ${response.status}`);
  }

  const data = await response.json();
  return data.data?.attributes?.token_prices?.[tokenAddress] ?? null;
}

// Usage
const USDC = 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v';
const price = await getTokenPrice(USDC);
console.log(`USDC Price: $${price}`);

API Endpoints Reference

Simple Token Price

Get token prices by contract address.

Endpoint: GET /simple/networks/{network}/token_price/{addresses}

Parameters:

Parameter	Type	Required	Description
`network`	string	Yes	Network ID (`solana`)
`addresses`	string	Yes	Comma-separated token addresses (max 30 Demo, 100 Pro)
`include_market_cap`	boolean	No	Include market cap data
`include_24hr_vol`	boolean	No	Include 24h volume
`include_24hr_price_change`	boolean	No	Include 24h price change %

async function getTokenPrices(addresses: string[]): Promise<Record<string, TokenPriceData>> {
  const addressList = addresses.join(',');
  const url = `${BASE_URL}/simple/networks/${NETWORK}/token_price/${addressList}`;

  const params = new URLSearchParams({
    include_market_cap: 'true',
    include_24hr_vol: 'true',
    include_24hr_price_change: 'true',
  });

  const response = await fetch(`${url}?${params}`, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.attributes || {};
}

Token Data by Address

Get detailed token information.

Endpoint: GET /networks/{network}/tokens/{address}

Parameters:

Parameter	Type	Required	Description
`network`	string	Yes	Network ID
`address`	string	Yes	Token contract address
`include`	string	No	Include `top_pools` for liquidity data

interface TokenData {
  address: string;
  name: string;
  symbol: string;
  decimals: number;
  image_url: string;
  price_usd: string;
  fdv_usd: string;
  market_cap_usd: string;
  total_supply: string;
  volume_usd: {
    h24: string;
  };
  price_change_percentage: {
    h24: string;
  };
}

async function getTokenData(address: string): Promise<TokenData> {
  const url = `${BASE_URL}/networks/${NETWORK}/tokens/${address}?include=top_pools`;

  const response = await fetch(url, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.attributes;
}

Multi-Token Data

Batch fetch multiple tokens.

Endpoint: GET /networks/{network}/tokens/multi/{addresses}

async function getMultipleTokens(addresses: string[]): Promise<TokenData[]> {
  const addressList = addresses.join(',');
  const url = `${BASE_URL}/networks/${NETWORK}/tokens/multi/${addressList}`;

  const response = await fetch(url, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.map((item: any) => item.attributes) || [];
}

Pool Data by Address

Get detailed pool information.

Endpoint: GET /networks/{network}/pools/{address}

Parameters:

Parameter	Type	Required	Description
`include`	string	No	`base_token`, `quote_token`, `dex`
`include_volume_breakdown`	boolean	No	Volume breakdown by timeframe

interface PoolData {
  address: string;
  name: string;
  pool_created_at: string;
  base_token_price_usd: string;
  quote_token_price_usd: string;
  base_token_price_native_currency: string;
  fdv_usd: string;
  market_cap_usd: string;
  reserve_in_usd: string;
  price_change_percentage: {
    m5: string;
    h1: string;
    h6: string;
    h24: string;
  };
  transactions: {
    m5: { buys: number; sells: number };
    h1: { buys: number; sells: number };
    h24: { buys: number; sells: number };
  };
  volume_usd: {
    m5: string;
    h1: string;
    h6: string;
    h24: string;
  };
}

async function getPoolData(poolAddress: string): Promise<PoolData> {
  const url = `${BASE_URL}/networks/${NETWORK}/pools/${poolAddress}`;

  const params = new URLSearchParams({
    include: 'base_token,quote_token,dex',
  });

  const response = await fetch(`${url}?${params}`, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.attributes;
}

Trending Pools

Get trending pools across all networks or filtered by network.

Endpoint: GET /networks/trending_pools

Parameters:

Parameter	Type	Default	Description
`include`	string	`base_token`	Attributes to include
`page`	integer	1	Page number
`duration`	string	`24h`	`5m`, `1h`, `6h`, `24h`

async function getTrendingPools(duration: '5m' | '1h' | '6h' | '24h' = '24h'): Promise<PoolData[]> {
  const url = `${BASE_URL}/networks/trending_pools`;

  const params = new URLSearchParams({
    include: 'base_token,quote_token,dex,network',
    duration,
    page: '1',
  });

  const response = await fetch(`${url}?${params}`, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.map((item: any) => item.attributes) || [];
}

// Filter for Solana pools
async function getSolanaTrendingPools(): Promise<PoolData[]> {
  const allPools = await getTrendingPools();
  return allPools.filter(pool => pool.network === 'solana');
}

Top Pools on Network

Get top pools by volume on Solana.

Endpoint: GET /networks/{network}/pools

async function getTopPools(page: number = 1): Promise<PoolData[]> {
  const url = `${BASE_URL}/networks/${NETWORK}/pools`;

  const params = new URLSearchParams({
    include: 'base_token,quote_token,dex',
    page: page.toString(),
  });

  const response = await fetch(`${url}?${params}`, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.map((item: any) => item.attributes) || [];
}

Search Pools

Search for pools by token name, symbol, or address.

Endpoint: GET /search/pools

Parameters:

Parameter	Type	Description
`query`	string	Search term (name, symbol, address)
`network`	string	Filter by network
`page`	integer	Page number

async function searchPools(query: string): Promise<PoolData[]> {
  const url = `${BASE_URL}/search/pools`;

  const params = new URLSearchParams({
    query,
    network: NETWORK,
    include: 'base_token,quote_token,dex',
  });

  const response = await fetch(`${url}?${params}`, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.map((item: any) => item.attributes) || [];
}

// Search for SOL pools
const solPools = await searchPools('SOL');

Pool OHLCV Chart

Get candlestick data for technical analysis.

Endpoint: GET /networks/{network}/pools/{pool_address}/ohlcv/{timeframe}

Timeframes: day, hour, minute

Parameters:

Parameter	Type	Description
`aggregate`	integer	Candle aggregation (1, 5, 15 for minute; 1, 4, 12 for hour)
`before_timestamp`	integer	Unix timestamp for pagination
`limit`	integer	Number of candles (max 1000)
`currency`	string	`usd` or `token`

interface OHLCVData {
  timestamp: number;
  open: number;
  high: number;
  low: number;
  close: number;
  volume: number;
}

async function getPoolOHLCV(
  poolAddress: string,
  timeframe: 'day' | 'hour' | 'minute' = 'hour',
  aggregate: number = 1,
  limit: number = 100
): Promise<OHLCVData[]> {
  const url = `${BASE_URL}/networks/${NETWORK}/pools/${poolAddress}/ohlcv/${timeframe}`;

  const params = new URLSearchParams({
    aggregate: aggregate.toString(),
    limit: limit.toString(),
    currency: 'usd',
  });

  const response = await fetch(`${url}?${params}`, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();

  return data.data?.attributes?.ohlcv_list?.map((candle: number[]) => ({
    timestamp: candle[0],
    open: candle[1],
    high: candle[2],
    low: candle[3],
    close: candle[4],
    volume: candle[5],
  })) || [];
}

// Get hourly candles
const hourlyCandles = await getPoolOHLCV(poolAddress, 'hour', 1, 24);

// Get 5-minute candles
const fiveMinCandles = await getPoolOHLCV(poolAddress, 'minute', 5, 100);

Recent Trades

Get recent trades for a pool.

Endpoint: GET /networks/{network}/pools/{pool_address}/trades

interface TradeData {
  block_number: number;
  block_timestamp: string;
  tx_hash: string;
  tx_from_address: string;
  from_token_amount: string;
  to_token_amount: string;
  price_from_in_currency_token: string;
  price_to_in_currency_token: string;
  price_from_in_usd: string;
  price_to_in_usd: string;
  kind: 'buy' | 'sell';
  volume_in_usd: string;
}

async function getRecentTrades(poolAddress: string): Promise<TradeData[]> {
  const url = `${BASE_URL}/networks/${NETWORK}/pools/${poolAddress}/trades`;

  const response = await fetch(url, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.map((item: any) => item.attributes) || [];
}

List DEXes on Solana

Get all decentralized exchanges on Solana.

Endpoint: GET /networks/{network}/dexes

interface DexData {
  id: string;
  name: string;
}

async function getSolanaDexes(): Promise<DexData[]> {
  const url = `${BASE_URL}/networks/${NETWORK}/dexes`;

  const response = await fetch(url, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.map((item: any) => ({
    id: item.id,
    name: item.attributes.name,
  })) || [];
}

Megafilter (Advanced)

Advanced filtering for pools across networks, DEXes, and tokens.

Endpoint: GET /pools/megafilter

Parameters:

Parameter	Type	Description
`networks`	string	Filter by network(s)
`dexes`	string	Filter by DEX(es)
`sort`	string	Sort order (e.g., `pool_created_at_desc`)
`min_reserve_in_usd`	number	Minimum liquidity
`min_h24_volume_usd`	number	Minimum 24h volume

async function getMegafilterPools(options: {
  dexes?: string[];
  minLiquidity?: number;
  minVolume?: number;
  sort?: string;
}): Promise<PoolData[]> {
  const url = `${BASE_URL}/pools/megafilter`;

  const params = new URLSearchParams({
    networks: NETWORK,
    page: '1',
  });

  if (options.dexes) {
    params.set('dexes', options.dexes.join(','));
  }
  if (options.minLiquidity) {
    params.set('min_reserve_in_usd', options.minLiquidity.toString());
  }
  if (options.minVolume) {
    params.set('min_h24_volume_usd', options.minVolume.toString());
  }
  if (options.sort) {
    params.set('sort', options.sort);
  }

  const response = await fetch(`${url}?${params}`, {
    headers: { [HEADER_KEY]: apiKey },
  });

  const data = await response.json();
  return data.data?.map((item: any) => item.attributes) || [];
}

// Get newest Pump.fun pools
const pumpfunPools = await getMegafilterPools({
  dexes: ['pump-fun'],
  sort: 'pool_created_at_desc',
});

// Get high-volume Raydium pools
const raydiumPools = await getMegafilterPools({
  dexes: ['raydium'],
  minVolume: 100000,
  minLiquidity: 50000,
});

Common Solana DEX Identifiers

DEX	ID	Description
Raydium	`raydium`	Leading AMM on Solana
Orca	`orca`	User-friendly DEX
Jupiter	`jupiter`	Aggregator with pools
Meteora	`meteora`	Dynamic AMM
Pump.fun	`pump-fun`	Memecoin launchpad
OpenBook	`openbook`	Order book DEX
Lifinity	`lifinity`	Proactive market maker
Phoenix	`phoenix`	On-chain order book

Common Token Addresses

Token	Address
USDC	`EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v`
USDT	`Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB`
SOL (Wrapped)	`So11111111111111111111111111111111111111112`
JUP	`JUPyiwrYJFskUPiHa7hkeR8VUtAeFoSYbKedZNsDvCN`
BONK	`DezXAZ8z7PnrnRJjz3wXBoRgixCa6xjnB7YaB1pPB263`
WIF	`EKpQGSJtjMFqKZ9KQanSqYXRcF8fBopzLHYxdM65zcjm`
PYTH	`HZ1JovNiVvGrGNiiYvEozEVgZ58xaU3RKwX8eACQBCt3`
RAY	`4k3Dyjzvzp8eMZWUXbBCjEvwSkkk59S5iCNLY3QrkX6R`
ORCA	`orcaEKTdK7LKz57vaAYr9QeNsVEPfiu6QeMU1kektZE`

Rate Limits

Plan	Calls/Minute	Max Addresses/Request
Demo (Free)	30	30
Analyst	500	50
Lite	500	50
Pro	1,000	100
Enterprise	Custom	Custom

Rate Limit Handling

class RateLimiter {
  private calls: number[] = [];
  private maxCalls: number;
  private windowMs: number = 60000; // 1 minute

  constructor(maxCallsPerMinute: number) {
    this.maxCalls = maxCallsPerMinute;
  }

  async waitForSlot(): Promise<void> {
    const now = Date.now();
    this.calls = this.calls.filter(t => now - t < this.windowMs);

    if (this.calls.length >= this.maxCalls) {
      const oldestCall = this.calls[0];
      const waitTime = this.windowMs - (now - oldestCall);
      await new Promise(resolve => setTimeout(resolve, waitTime));
    }

    this.calls.push(Date.now());
  }
}

// Usage
const rateLimiter = new RateLimiter(30); // Demo API

async function fetchWithRateLimit(url: string): Promise<any> {
  await rateLimiter.waitForSlot();
  const response = await fetch(url, {
    headers: { [HEADER_KEY]: apiKey },
  });
  return response.json();
}

Error Handling

async function safeApiCall<T>(url: string): Promise<T | null> {
  try {
    const response = await fetch(url, {
      headers: { [HEADER_KEY]: apiKey },
    });

    if (response.status === 401) {
      throw new Error('Invalid API key');
    }
    if (response.status === 429) {
      throw new Error('Rate limit exceeded - wait before retrying');
    }
    if (response.status === 404) {
      console.warn('Resource not found');
      return null;
    }
    if (!response.ok) {
      throw new Error(`API error: ${response.status}`);
    }

    return response.json();
  } catch (error) {
    console.error('CoinGecko API error:', error);
    throw error;
  }
}

Common Error Codes

Code	Meaning	Solution
401	Invalid API key	Check your API key
429	Rate limit exceeded	Wait and retry, or upgrade plan
404	Resource not found	Check address/network ID
500+	Server error	Retry with exponential backoff

Best Practices

Security

Never commit API keys to git
Use environment variables
Rotate keys periodically
Use separate keys for dev/prod

Performance

Batch token requests when possible
Cache frequently accessed data
Use appropriate timeframes for OHLCV
Implement request queuing for rate limits

Data Quality

Verify market cap data (may be null if unverified)
Check pool liquidity before trusting prices
Use multiple timeframes for price analysis
Monitor last trade timestamp for activity

Resources

Skill Structure

coingecko/
├── SKILL.md                      # This file
├── resources/
│   ├── api-reference.md          # Complete API endpoint reference
│   ├── network-dex-ids.md        # Solana network and DEX identifiers
│   └── token-addresses.md        # Common Solana token addresses
├── examples/
│   ├── token-prices/
│   │   └── get-token-price.ts    # Token price examples
│   ├── pools/
│   │   └── pool-data.ts          # Pool data examples
│   ├── ohlcv/
│   │   └── ohlcv-charts.ts       # OHLCV chart examples
│   ├── trades/
│   │   └── recent-trades.ts      # Trade history examples
│   └── integration/
│       └── full-client.ts        # Complete client example
├── templates/
│   └── coingecko-client.ts       # Production-ready client template
└── docs/
    └── troubleshooting.md        # Common issues and solutions

farcaster

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Author

@0xinit

Stars

Repository

0xinit/cryptoskills

skills/farcaster/SKILL.md

Farcaster

Farcaster is a sufficiently decentralized social protocol. Users register onchain identities (FIDs) on OP Mainnet and publish social data (casts, reactions, links) as offchain messages to Snapchain, a purpose-built message ordering layer. Neynar provides the primary API infrastructure and, since January 2026, owns the Farcaster protocol itself. Frames v2 (Mini Apps) enable full-screen interactive web applications embedded inside Farcaster clients like Warpcast.

What You Probably Got Wrong

Manifest accountAssociation domain MUST exactly match the FQDN where /.well-known/farcaster.json is hosted. A mismatch causes silent failure -- the Mini App will not load, no error is surfaced to the developer, and Warpcast simply shows nothing. The domain in the signature payload must be byte-identical to the hosting domain (no trailing slash, no protocol prefix, no port unless non-standard).
Neynar webhooks MUST be verified via HMAC-SHA512 at write time. Check the X-Neynar-Signature header against the raw request body. Never parse JSON before verification -- you must verify the raw bytes.

import crypto from "node:crypto";
import type { IncomingHttpHeaders } from "node:http";

function verifyNeynarWebhook(
  rawBody: Buffer,
  headers: IncomingHttpHeaders,
  webhookSecret: string
): boolean {
  const signature = headers["x-neynar-signature"];
  if (typeof signature !== "string") return false;

  const hmac = crypto.createHmac("sha512", webhookSecret);
  hmac.update(rawBody);
  const computedSignature = hmac.digest("hex");

  return crypto.timingSafeEqual(
    Buffer.from(signature, "hex"),
    Buffer.from(computedSignature, "hex")
  );
}

Farcaster is NOT a blockchain. It is a social protocol with an onchain registry (OP Mainnet) for identity and key management, plus an offchain message layer (Snapchain) for social data. Casts, reactions, and follows are never posted to any blockchain.
FIDs are onchain but casts are NOT. Farcaster IDs (FIDs) live in the IdRegistry contract on OP Mainnet. Casts, reactions, and link messages are stored on Snapchain and are not onchain data.
Frames v2 is NOT Frames v1 -- completely different spec. Frames v1 used static OG images with action buttons and server-side rendering. Frames v2 (Mini Apps) are full-screen interactive web applications loaded in an iframe with SDK access to wallet, user context, and notifications. Do not mix the two APIs.
Neynar is NOT just an API provider. Neynar acquired Farcaster from Merkle Manufactory in January 2026. Neynar now owns and operates the protocol, the Snapchain infrastructure, and the primary API layer.
Frame images must be static. Frame preview images (OG images shown in feed) cannot contain JavaScript. They are rendered as static images by the client. Interactive behavior only works inside the launched Mini App.
@farcaster/frame-sdk and @farcaster/miniapp-sdk are converging. Both packages exist but frame-sdk is the current stable package for Frames v2. Check import paths -- functionality overlaps but the packages are not yet unified.
Farcaster timestamps use a custom epoch. Timestamps are seconds since January 1, 2021 00:00:00 UTC (Farcaster epoch), not Unix epoch. To convert: unixTimestamp = farcasterTimestamp + 1609459200.
Cast text has a 1024 BYTE limit, not characters. UTF-8 multibyte characters (emoji, CJK, accented characters) consume 2-4 bytes each. A 1024-character cast with emoji will exceed the limit.
Warpcast aggressively caches OG/frame images. Changing content at the same URL will not update the preview in Warpcast feeds. Use cache-busting query parameters or new URLs when updating frame images.

Critical Context

Neynar acquired Farcaster from Merkle Manufactory in January 2026. This means:

Neynar operates the protocol, Snapchain validators, and the Hub network
The Neynar API is the canonical way to interact with Farcaster
Warpcast remains the primary client, now under Neynar's umbrella
The open-source protocol spec and hub software remain MIT-licensed
Third-party hubs can still run, but Neynar controls the reference implementation

Protocol Architecture

Snapchain

Snapchain replaced the Hub network in April 2025 as Farcaster's offchain message ordering layer.

Property	Detail
Consensus	Malachite BFT (Tendermint-derived)
Throughput	10,000+ messages per second
Sharding	Account-level -- each FID's messages are ordered independently
Finality	Sub-second for message acceptance
Data model	Append-only log of signed messages per FID
Validator set	Operated by Neynar (post-acquisition)

Messages on Snapchain are CRDTs (Conflict-free Replicated Data Types). Each message type has merge rules that ensure consistency across nodes without coordination:

CastAdd conflicts with a later CastRemove for the same hash -- remove wins
ReactionAdd conflicts with ReactionRemove for the same target -- last-write-wins by timestamp
LinkAdd conflicts with LinkRemove -- last-write-wins by timestamp

Message Structure

Every Farcaster message is an Ed25519-signed protobuf:

MessageData {
  type: MessageType     // CAST_ADD, REACTION_ADD, LINK_ADD, etc.
  fid: uint64           // Farcaster ID of the author
  timestamp: uint32     // Farcaster epoch seconds
  network: Network      // MAINNET = 1
  body: MessageBody     // Type-specific payload
}

Message {
  data: MessageData
  hash: bytes           // Blake3 hash of serialized MessageData
  hash_scheme: BLAKE3
  signature: bytes      // Ed25519 signature over hash
  signature_scheme: ED25519
  signer: bytes         // Public key of the signer (app key)
}

Onchain Registry (OP Mainnet)

Farcaster's onchain contracts manage identity, keys, and storage on OP Mainnet.

Last verified: March 2026

Contract	Address	Purpose
IdRegistry	`0x00000000Fc6c5F01Fc30151999387Bb99A9f489b`	Maps FIDs to custody addresses
KeyRegistry	`0x00000000Fc1237824fb747aBDE0FF18990E59b7e`	Maps FIDs to Ed25519 app keys (signers)
StorageRegistry	`0x00000000FcCe7f938e7aE6D3c335bD6a1a7c593D`	Manages storage units per FID
IdGateway	`0x00000000Fc25870C6eD6b6c7E41Fb078b7656f69`	Permissioned FID registration entry point
KeyGateway	`0x00000000fC56947c7E7183f8Ca4B62398CaaDF0B`	Permissioned key addition entry point
Bundler	`0x00000000FC04c910A0b5feA33b03E0447ad0B0aA`	Batches register + addKey + rent in one tx

# Verify IdRegistry is deployed on OP Mainnet
cast code 0x00000000Fc6c5F01Fc30151999387Bb99A9f489b --rpc-url https://mainnet.optimism.io

# Look up custody address for an FID
cast call 0x00000000Fc6c5F01Fc30151999387Bb99A9f489b \
  "custodyOf(uint256)(address)" 3 \
  --rpc-url https://mainnet.optimism.io

Registration Flow

1. User calls IdGateway.register() or Bundler.register()
   -> IdRegistry assigns next sequential FID to custody address
       |
2. User (or Bundler) calls KeyGateway.add()
   -> KeyRegistry maps FID to an Ed25519 public key (app key / signer)
       |
3. User (or Bundler) calls StorageRegistry.rent()
   -> Allocates storage units (each unit = 5,000 casts, 2,500 reactions, 2,500 links)
       |
4. App key can now sign Farcaster messages on behalf of the FID

Farcaster IDs (FIDs)

Every Farcaster user has an FID -- a sequentially assigned uint256 stored in IdRegistry on OP Mainnet.

Concept	Description
FID	The user's numeric identity, immutable once assigned
Custody address	The Ethereum address that owns the FID -- can transfer ownership
App key (signer)	Ed25519 key pair registered in KeyRegistry -- signs messages
Recovery address	Can initiate FID recovery if custody address is compromised

An FID can have multiple app keys. Each app (Warpcast, third-party client) registers its own app key via KeyGateway. The custody address can revoke any app key by calling KeyRegistry.remove().

Neynar API v2

Neynar provides the primary API for reading and writing Farcaster data. Current SDK version: @neynar/nodejs-sdk v3.131.0.

Setup

npm install @neynar/nodejs-sdk

import { NeynarAPIClient, Configuration } from "@neynar/nodejs-sdk";

const config = new Configuration({
  apiKey: process.env.NEYNAR_API_KEY,
});

const neynar = new NeynarAPIClient(config);

Fetch User by FID

const { users } = await neynar.fetchBulkUsers({ fids: [3] });
const user = users[0];
console.log(user.username, user.display_name, user.follower_count);

Publish a Cast

const response = await neynar.publishCast({
  signerUuid: process.env.SIGNER_UUID,
  text: "Hello from Neynar SDK",
});
console.log(response.cast.hash);

Fetch Feed

const feed = await neynar.fetchFeed({
  feedType: "following",
  fid: 3,
  limit: 25,
});

for (const cast of feed.casts) {
  console.log(`@${cast.author.username}: ${cast.text}`);
}

Search Users

const result = await neynar.searchUser({ q: "vitalik", limit: 5 });
for (const user of result.result.users) {
  console.log(`FID ${user.fid}: @${user.username}`);
}

Fetch Cast by Hash

const { cast } = await neynar.lookupCastByHashOrWarpcastUrl({
  identifier: "0xfe90f9de682273e05b201629ad2338bdcd89b6be",
  type: "hash",
});
console.log(cast.text, cast.reactions.likes_count);

Webhook Configuration

Create webhooks in the Neynar dashboard or via API. Webhooks fire on cast creation, reaction events, follow events, and more.

import express from "express";
import crypto from "node:crypto";

const app = express();

// Raw body is required for signature verification
app.use("/webhook", express.raw({ type: "application/json" }));

app.post("/webhook", (req, res) => {
  const rawBody = req.body as Buffer;
  const signature = req.headers["x-neynar-signature"] as string;

  if (!signature) {
    res.status(401).json({ error: "Missing signature" });
    return;
  }

  const hmac = crypto.createHmac("sha512", process.env.NEYNAR_WEBHOOK_SECRET!);
  hmac.update(rawBody);
  const computed = hmac.digest("hex");

  const isValid = crypto.timingSafeEqual(
    Buffer.from(signature, "hex"),
    Buffer.from(computed, "hex")
  );

  if (!isValid) {
    res.status(401).json({ error: "Invalid signature" });
    return;
  }

  const event = JSON.parse(rawBody.toString("utf-8"));
  console.log("Verified webhook event:", event.type);

  res.status(200).json({ status: "ok" });
});

app.listen(3001, () => console.log("Webhook listener on :3001"));

Frames v2 / Mini Apps

Frames v2 are full-screen interactive web applications embedded inside Farcaster clients. They replaced the static image + button model of Frames v1 with a rich SDK-powered experience.

Manifest (`/.well-known/farcaster.json`)

Every Mini App must serve a manifest at /.well-known/farcaster.json on its domain:

{
  "accountAssociation": {
    "header": "eyJmaWQiOjM...",
    "payload": "eyJkb21haW4iOiJleGFtcGxlLmNvbSJ9",
    "signature": "abc123..."
  },
  "frame": {
    "version": "1",
    "name": "My Mini App",
    "iconUrl": "https://example.com/icon.png",
    "homeUrl": "https://example.com/app",
    "splashImageUrl": "https://example.com/splash.png",
    "splashBackgroundColor": "#1a1a2e",
    "webhookUrl": "https://example.com/api/webhook"
  }
}

The accountAssociation proves that the FID owner controls the domain. The payload decoded is {"domain":"example.com"} -- this domain MUST match the FQDN hosting the manifest file.

Meta Tags

Add these to your app's HTML <head> for Farcaster clients to discover the Mini App:

<meta name="fc:frame" content='{"version":"next","imageUrl":"https://example.com/og.png","button":{"title":"Launch App","action":{"type":"launch_frame","name":"My App","url":"https://example.com/app","splashImageUrl":"https://example.com/splash.png","splashBackgroundColor":"#1a1a2e"}}}' />

Frame SDK Setup

npm install @farcaster/frame-sdk

import sdk from "@farcaster/frame-sdk";

async function initMiniApp() {
  const context = await sdk.context;

  // context.user contains the viewing user's FID, username, pfpUrl
  console.log(`User FID: ${context.user.fid}`);
  console.log(`Username: ${context.user.username}`);

  // Signal to the client that the app is ready to render
  sdk.actions.ready();
}

initMiniApp();

SDK Actions

// Open an external URL in the client's browser
sdk.actions.openUrl("https://example.com");

// Close the Mini App
sdk.actions.close();

// Compose a cast with prefilled text
sdk.actions.composeCast({
  text: "Check out this Mini App!",
  embeds: ["https://example.com/app"],
});

// Add a Mini App to the user's favorites (prompts confirmation)
sdk.actions.addFrame();

Transaction Frames

Mini Apps can trigger onchain transactions through the embedded wallet provider. The SDK exposes an EIP-1193 provider that connects to the user's wallet in the Farcaster client.

Wallet Provider Setup

import sdk from "@farcaster/frame-sdk";
import { createWalletClient, custom, parseEther, type Address } from "viem";
import { base } from "viem/chains";

async function sendTransaction() {
  const context = await sdk.context;

  const provider = sdk.wallet.ethProvider;

  const walletClient = createWalletClient({
    chain: base,
    transport: custom(provider),
  });

  const [address] = await walletClient.requestAddresses();

  const hash = await walletClient.sendTransaction({
    account: address,
    to: "0xRecipient..." as Address,
    value: parseEther("0.001"),
  });

  return hash;
}

With Wagmi Connector

For apps using wagmi, wrap the SDK's provider as a connector:

import sdk from "@farcaster/frame-sdk";
import { createConfig, http, useConnect, useSendTransaction } from "wagmi";
import { base } from "wagmi/chains";
import { farcasterFrame } from "@farcaster/frame-wagmi-connector";

const config = createConfig({
  chains: [base],
  transports: {
    [base.id]: http(),
  },
  connectors: [farcasterFrame()],
});

// In your React component:
function MintButton() {
  const { connect, connectors } = useConnect();
  const { sendTransaction } = useSendTransaction();

  async function handleMint() {
    connect({ connector: connectors[0] });
    sendTransaction({
      to: "0xNFTContract..." as `0x${string}`,
      data: "0x...", // mint function calldata
      value: parseEther("0.01"),
    });
  }

  return <button onClick={handleMint}>Mint</button>;
}

Warpcast Deep Links and Cast Intents

Cast Intent URL

Open Warpcast's compose screen with prefilled content:

https://warpcast.com/~/compose?text=Hello%20Farcaster&embeds[]=https://example.com

Parameter	Description
`text`	URL-encoded cast text
`embeds[]`	Up to 2 embed URLs
`channelKey`	Channel to post in (e.g., `farcaster`)

Deep Links

# Open a user's profile
https://warpcast.com/<username>

# Open a specific cast
https://warpcast.com/<username>/<cast-hash>

# Open a channel
https://warpcast.com/~/channel/<channel-id>

# Open direct cast composer
https://warpcast.com/~/inbox/create/<fid>

Channels

Channels are topic-based feeds identified by a parent_url. A cast is posted to a channel by setting its parent_url to the channel's URL.

// Post a cast to the "ethereum" channel
const response = await neynar.publishCast({
  signerUuid: process.env.SIGNER_UUID,
  text: "Pectra upgrade is live!",
  channelId: "ethereum",
});

Channel Lookup

const channel = await neynar.lookupChannel({ id: "farcaster" });
console.log(channel.channel.name, channel.channel.follower_count);

Channel Feed

const feed = await neynar.fetchFeed({
  feedType: "filter",
  filterType: "channel_id",
  channelId: "ethereum",
  limit: 25,
});

Neynar API Pricing

Current as of March 2026

Plan	Monthly Credits	Price	Webhooks	Rate Limit
Free	100K	$0	1	5 req/s
Starter	1M	$49/mo	5	20 req/s
Growth	10M	$249/mo	25	50 req/s
Scale	60M	$899/mo	100	200 req/s
Enterprise	Custom	Custom	Unlimited	Custom

Credit costs vary by endpoint. Read operations (user lookup, feed) cost 1-5 credits. Write operations (publish cast, react) cost 10-50 credits. Webhook deliveries are free but count against webhook limits.

Hub / Snapchain Endpoints

Direct hub access for reading raw Farcaster data without the Neynar API abstraction.

Provider	Endpoint	Auth
Neynar Hub API	`hub-api.neynar.com`	API key in `x-api-key` header
Self-hosted Hub	`localhost:2283`	None (local)

Hub HTTP API Examples

# Get casts by FID
curl -H "x-api-key: $NEYNAR_API_KEY" \
  "https://hub-api.neynar.com/v1/castsByFid?fid=3&pageSize=10"

# Get user data (display name, bio, pfp)
curl -H "x-api-key: $NEYNAR_API_KEY" \
  "https://hub-api.neynar.com/v1/userDataByFid?fid=3"

# Get reactions by FID
curl -H "x-api-key: $NEYNAR_API_KEY" \
  "https://hub-api.neynar.com/v1/reactionsByFid?fid=3&reactionType=1"

Hub gRPC API

# Install hubble CLI
npm install -g @farcaster/hubble

# Query via gRPC
hubble --insecure -r hub-api.neynar.com:2283 getCastsByFid --fid 3

Farcaster Epoch Conversion

// Farcaster epoch: January 1, 2021 00:00:00 UTC
const FARCASTER_EPOCH = 1609459200;

function farcasterTimestampToUnix(farcasterTs: number): number {
  return farcasterTs + FARCASTER_EPOCH;
}

function unixToFarcasterTimestamp(unixTs: number): number {
  return unixTs - FARCASTER_EPOCH;
}

function farcasterTimestampToDate(farcasterTs: number): Date {
  return new Date((farcasterTs + FARCASTER_EPOCH) * 1000);
}

Related Skills

viem -- Used for onchain interactions with Farcaster registry contracts on OP Mainnet and for building transaction frames with the wallet provider
wagmi -- React hooks for wallet connection in Mini Apps via the @farcaster/frame-wagmi-connector
x402 -- Payment protocol that can be integrated with Farcaster Mini Apps for paywalled content

Comparing coingecko with farcaster

coingecko

CoinGecko Solana API Development Guide

Overview

Key Features

Quick Start

Get Your API Key

Environment Setup

API Configuration

Basic Token Price Fetch

API Endpoints Reference

Simple Token Price

Token Data by Address

Multi-Token Data

Pool Data by Address

Trending Pools

Top Pools on Network

Search Pools

Pool OHLCV Chart

Recent Trades

List DEXes on Solana

Megafilter (Advanced)

Common Solana DEX Identifiers

Common Token Addresses

Rate Limits

Rate Limit Handling

Error Handling

Common Error Codes

Best Practices

Security

Performance

Data Quality

Resources

Skill Structure

farcaster

Farcaster

What You Probably Got Wrong

Critical Context

Protocol Architecture

Snapchain

Message Structure

Onchain Registry (OP Mainnet)

Registration Flow

Farcaster IDs (FIDs)

Neynar API v2

Setup

Fetch User by FID

Publish a Cast

Fetch Feed

Search Users

Fetch Cast by Hash

Webhook Configuration

Frames v2 / Mini Apps

Manifest (/.well-known/farcaster.json)

Meta Tags

Frame SDK Setup

SDK Actions

Transaction Frames

Wallet Provider Setup

With Wagmi Connector

Warpcast Deep Links and Cast Intents

Cast Intent URL

Deep Links

Channels

Channel Lookup

Channel Feed

Neynar API Pricing

Hub / Snapchain Endpoints

Hub HTTP API Examples

Hub gRPC API

Farcaster Epoch Conversion

Related Skills

References

AI Skill Finder

Manifest (`/.well-known/farcaster.json`)