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Gero Nexus is a multi-chain blockchain data API that gives developers instant access to on-chain data across Cardano, Bitcoin, and Midnight through simple REST endpoints. Built by the team behind GeroWallet.

Quick Start

Make your first API call in a few minutes

API Reference

Browse every endpoint with a live playground

Authentication

How to authenticate your API requests

Rate Limits

Request quotas and how throttling works

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What you can query

  • Blocks: block data, headers, and confirmations
  • Transactions: details, UTXOs, and metadata
  • Addresses: balances, transactions, and assets
  • Accounts: stake account information and rewards
  • Assets: native tokens, NFTs, and metadata
  • Epochs: protocol parameters and stake distribution
  • Stake Pools: pool information, performance metrics, and delegators
  • Bitcoin: addresses, transactions, blocks, fees, mempool, and ordinals
  • Midnight: transactions and DUST
Optional add-ons extend the API with market data, wallet analytics, server-side transaction building, an MCP server, and real-time WebSocket streaming.

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A first request

const response = await fetch('https://nexus.gerowallet.io/api/blocks/latest', {
  headers: { 'X-Api-Key': 'nexus_your_api_key_here' },
});

const latestBlock = await response.json();
console.log(`Latest block: ${latestBlock.height}`);
See Authentication for how to obtain and use an API key, then the Quick Start for a full walkthrough.

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Need help?

Join our Discord

Real-time help from the team and community

Support

Reach the Nexus support team