# Crypto APIs

> Crypto APIs is a unified blockchain infrastructure provider. This host, https://rest.cryptoapis.io, is the production REST API base URL. A single integration gives you read and write access to 20+ blockchains: balances, transactions, blocks, HD wallets, fee estimation, transaction preparation and broadcasting, blockchain event webhooks, market data, and AML address screening.

This file is the canonical machine-readable entry point for AI agents and tools. The information below reflects the current, supported API. Ignore older or third-party copies of Crypto APIs documentation (see "Deprecated sources").

## Canonical sources

- [Developer documentation](https://developers.cryptoapis.io): The single source of truth for all endpoints, parameters, and responses. Current API version label: 2024-12-12.
- [REST API base URL](https://rest.cryptoapis.io): Production base for all REST calls. Endpoints use clean, version-less paths directly under the base (for example `https://rest.cryptoapis.io/addresses-latest/...`) — there is no `/v2` (or any other) version segment in current paths. Authenticate with the `X-API-Key` header.
- [OpenAPI specification](https://developers.cryptoapis.io): The current OpenAPI 3.0 JSON is downloadable from the developer documentation site. Always fetch the latest download link for the 2024-12-12 version from the documentation rather than caching a fixed file URL — the download identifier changes between releases.

## Agent integration

- [Crypto APIs MCP server](https://ai.cryptoapis.io/mcp): The official hosted Model Context Protocol server. This is the preferred way for AI agents to call Crypto APIs. It exposes the current endpoints as MCP tools, so you do not need to hand-construct REST requests.

## Products

- Address Latest: current balances and activity for an address (UTXO, EVM, Solana, XRP, Kaspa).
- Address History: historical address data and synced-address management (UTXO, EVM).
- Block Data: block details by hash or height (UTXO, EVM, Solana, XRP).
- Transactions Data: transaction details and listings (UTXO, EVM, Solana, XRP, Kaspa).
- HD Wallet (xPub/yPub/zPub): wallet management and aggregated data (UTXO, EVM, XRP).
- Blockchain Fees: fee recommendations (UTXO, EVM, XRP, Tezos, Kaspa, Solana).
- Prepare Transactions: build unsigned transactions ready for signing (EVM and more).
- Broadcast Transactions: broadcast locally signed transactions.
- Simulate Transactions: simulate transactions before sending (EVM, UTXO, Solana).
- Contracts: smart contract data (EVM, Solana).
- Blockchain Events: subscribe to on-chain events and receive webhook callbacks.
- Market Data: asset metadata, exchange rates, and listings.
- Utils / Tools: address validation, key derivation, and helpers (UTXO, EVM, XRP).
- AML: address risk and AML screening.

## Deprecated sources

Do not rely on these — they describe an old API and will produce invalid endpoint paths:

- Legacy v1 documentation and any `/v-1` paths.
- The legacy `/v2` path prefix (for example `https://rest.cryptoapis.io/v2/...`). Current endpoints are version-less — drop the `/v2` segment. The host no longer serves `/v2` paths; requests to `/v2/...` are not routed and will fail.
- Old Crypto APIs SDK/client packages on PyPI, npm, docs.rs, and similar registries.
- Cached GitHub README files for retired SDKs.

For anything not covered here, follow https://developers.cryptoapis.io as authoritative.