blockchain APIs

Bitquery provides GraphQL APIs for querying on-chain data across 40+ blockchains including Ethereum, Solana, and BSC.

Chainlink is a decentralized oracle network that connects smart contracts to real-world data like price feeds, random numbers, and external APIs.

Chainpoint anchors any data hash to the Bitcoin blockchain, creating a tamper-proof proof of existence for documents, records, or any digital content.

Etherscan's API gives programmatic access to Ethereum blockchain data — account balances, transaction histories, token transfers, smart contract ABIs, and gas prices.

The Helium API provides access to legacy blockchain data for the Helium IoT network — hotspot locations, earnings, network coverage, and device activity.

NOWNodes provides hosted blockchain node access for 50+ cryptocurrencies via a simple API key — no need to run your own full node for Bitcoin, Ethereum, or other chains.

Steem is a blockchain-based social media platform with a public API for reading posts, comments, votes, account data, and blockchain operations.

The Graph is a decentralized indexing protocol that lets you query Ethereum and other blockchain networks using GraphQL.

Watchdata provides a simple JSON-RPC and REST gateway to the Ethereum blockchain, giving you account balances, transaction history, and token data without syncing a node.

CoinGecko provides comprehensive cryptocurrency market data covering 10,000+ coins across 700+ exchanges, including prices, market caps, trading volume, and developer or community statistics.

CoinMarketCap provides the most widely referenced cryptocurrency market data, covering 9,000+ coins with prices, rankings, market caps, and OHLCV history.