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Build with Fathom(x)

Developers: Build faster with our multi-chain crypto API

Welcome to the Fathom(x) API documentation! Our REST API provides cryptocurrency address transaction data across multiple blockchains, giving you access to comprehensive crypto data through a simple, unified interface.

What is Fathom(x)?

Fathom(x) is a multi-currency crypto data API that provides:

  • Transaction History: Get detailed transaction data for cryptocurrency addresses
  • Balance Information: Check current balances for addresses across supported chains
  • Multi-Chain Support: Access data for Bitcoin, Ethereum, Litecoin, Dogecoin, Zcash, THORChain, Base, and Bitcoin Cash
  • Real-time Data: Get up-to-date blockchain information through our robust infrastructure

Getting Started

Start building with Fathom(x) by exploring our endpoints for transactions, balances, and currency information. All endpoints work without authentication but have higher rate limits with a Bearer token.

API Reference
Key Concepts
SDKs
Supported Currencies

Quick Example

Here’s a quick example of fetching Bitcoin transaction data:

$curl "https://api.fathomx.dev/api/v0/addresses/BTC/bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh/transactions?limit=10"

Authentication (Optional)

While all endpoints work without authentication, you can include a Bearer token for higher rate limits:

$curl -H "Authorization: Bearer YOUR_JWT_TOKEN" \
>  "https://api.fathomx.dev/api/v0/addresses/BTC/bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh/balance"

Get Support

Need help with the Fathom(x) API? We’re here to assist you with integration questions, troubleshooting, and feature requests. Reach out to us via email for prompt assistance.