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Gero Nexus is a multi-chain blockchain data API that gives developers on-chain data across Cardano, Bitcoin, and Midnight through simple REST endpoints. Built by the team behind GeroWallet. One account, one base URL, one auth header, and one docs site across every chain. Each API key is scoped to one chain and one network, so you create a key per chain and network you call. See Authentication for the scoping rule and the error you get when a request and a key disagree.

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, metadata, submission, and script evaluation (execution units)
  • Scripts: resolve Plutus/native scripts and Plutus datums by hash
  • 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 enable market data, wallet analytics, server-side transaction building, an MCP server, and IPFS. WebSocket packages add live streaming. Add-on endpoints return HTTP 402 on a key whose plan does not carry the matching add-on.

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A first request

See Authentication for how to obtain and use an API key, then the Quick Start for a full walkthrough. Every endpoint in the API Reference also has a live playground that authenticates with your X-Api-Key.

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Need help?

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Real-time help from the team and community

Support

Reach the Nexus support team