Blockchain Data & Nodes APIs
Blockchain data APIs read chains directly, either as raw node access or as indexed explorer data. Infura, GetBlock and NOWNodes give JSON-RPC endpoints, and Solana's public mainnet endpoint is free and keyless. Indexers such as Etherscan, Blockscout and The Graph return balances, transactions and token transfers without running a node. Others focus on one chain, like Mempool for Bitcoin fees or Blockfrost for Cardano.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
Alchemy NFT APINFT ownership, metadata, collections, sales and floor prices on Ethereum and other EVM chains. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | — | Live |
Bitcoin HalvingComputes Bitcoin's halving era, block subsidy and blocks-to-next-halving for any block height. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Live |
BitqueryGraphQL API for real-time and historical on-chain data: DEX trades, transfers, balances, NFTs on 40+ chains. Crypto › Blockchain Data & Nodes | Free trial | API key | JSON | — | Live |
Block.ioBitcoin, Dogecoin and Litecoin blockchain data: balances, transactions, blocks and unspent outputs. Crypto › Blockchain Data & Nodes | Paid | API key | JSON | — | Deprecated |
Blockchain.com Data APILive Bitcoin blockchain data: blocks, transactions, addresses, and market/network charts. Crypto › Blockchain Data & Nodes | Freemium | None | JSON | Unlimited | Live |
BlockfrostQueries the Cardano blockchain — blocks, transactions, addresses, pools, assets — and pins to IPFS. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | — | Live |
BlockscoutOpen-source EVM block explorer data — blocks, transactions, addresses, tokens — across 100+ chains. Crypto › Blockchain Data & Nodes | Freemium | None | JSON | Unlimited | Live |
BTCGlobeLive Bitcoin data from two home full nodes: block height, fees, mempool, peer counts and price. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Live |
btcnode.ukLive Bitcoin node data (blocks, mempool, fees, addresses), paid per call in USDC or Lightning, no signup. Crypto › Blockchain Data & Nodes | Paid | Other | JSON | — | Live |
CryptoLabelResolves Bitcoin, Ethereum and Tron addresses into known entity names and public risk/activity labels. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Live |
Deep Blue AlphaReal-time Ethereum whale-wallet tracking: DEX swaps, exchange flows, and sentiment scoring. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | Unlimited | Degraded |
EtherscanEthereum and 60+ EVM chain blockchain data: balances, transactions, contracts, token transfers. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | 10k+/day | Live |
EthplorerEthereum token balances, prices, transactions, and contract data across several EVM chains. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | 1k–10k/day | Live |
GetBlockJSON-RPC node access to 130+ blockchains (Ethereum, Bitcoin, Solana, and more) for on-chain data. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | 10k+/day | Live |
Helium Entity APILook up Helium network Hotspot metadata, wallet Hotspot lists and OUI organizations on Solana. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Live |
INFURA EthereumHosted Ethereum node access (mainnet and testnets) via JSON-RPC, over HTTPS or WebSocket. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | — | Untested |
MempoolLive Bitcoin mempool, fee estimates, block, address and Lightning Network data. Crypto › Blockchain Data & Nodes | Freemium | None | JSON | — | Live |
monerometricsMonero network health, reorg detection, mining-pool centralization, and live Haveno XMR/USD market data. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Live |
Moralis NFT APINFT metadata, owners, transfers, collections and floor prices across Ethereum and other EVM chains. Crypto › Blockchain Data & Nodes | Paid | API key | JSON | — | Live |
NOWNodesBlockchain node access (JSON-RPC, WebSocket, gRPC, Blockbook) on 120+ networks, with free public RPC. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | 1k–10k/day | Untested |
OpenChainBenchLive, reproducible benchmarks for crypto infrastructure: RPC latency, bridge fees, oracle deviation. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Live |
Paycoin IndexHourly-updated index of stablecoin transfer costs across 9 blockchains, with daily history and source data. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Live |
Solana JSON RPCQuery Solana blockchain state, transactions and account data via JSON-RPC over the public mainnet endpoint. Crypto › Blockchain Data & Nodes | Free | None | JSON | — | Untested |
SoloLuckBitcoin solo-mining pool stats, per-address miner data, and an open dataset of verified solo-mined blocks. Crypto › Blockchain Data & Nodes | Free | None | JSON | 10k+/day | Live |
SteemJSON-RPC API for the Steem blockchain: blocks, accounts, balances and blogging/social content. Crypto › Blockchain Data & Nodes | Free | None | JSON | Unlimited | Untested |
SwiftNodesJSON-RPC and WebSocket access to 75+ blockchains (Ethereum, Solana, Bitcoin, Cosmos, etc.) via one API key. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | 1k–10k/day | Untested |
The GraphGraphQL access to indexed on-chain data (subgraphs) across Ethereum and other blockchain networks. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | 1k–10k/day | Untested |
WatchDataNode access (Ethereum, Bitcoin, Tron, BSC, Polygon) plus a token price and transfer-history API. Crypto › Blockchain Data & Nodes | Freemium | API key | JSON | — | Live |
Alchemy NFT APIFreemiumLive
NFT ownership, metadata, collections, sales and floor prices on Ethereum and other EVM chains.
API key · JSON
—
no machine-readable spec
Bitcoin HalvingFreeLive
Computes Bitcoin's halving era, block subsidy and blocks-to-next-halving for any block height.
None · JSON
Unlimited
llms.txt
BitqueryFree trialLive
GraphQL API for real-time and historical on-chain data: DEX trades, transfers, balances, NFTs on 40+ chains.
API key · JSON
—
MCP server
Block.ioPaidDeprecated
Bitcoin, Dogecoin and Litecoin blockchain data: balances, transactions, blocks and unspent outputs.
API key · JSON
—
no machine-readable spec
Blockchain.com Data APIFreemiumLive
Live Bitcoin blockchain data: blocks, transactions, addresses, and market/network charts.
None · JSON
Unlimited
OpenAPI spec
BlockfrostFreemiumLive
Queries the Cardano blockchain — blocks, transactions, addresses, pools, assets — and pins to IPFS.
API key · JSON
—
OpenAPI spec
BlockscoutFreemiumLive
Open-source EVM block explorer data — blocks, transactions, addresses, tokens — across 100+ chains.
None · JSON
Unlimited
MCP server · llms.txt
BTCGlobeFreeLive
Live Bitcoin data from two home full nodes: block height, fees, mempool, peer counts and price.
None · JSON
Unlimited
llms.txt
btcnode.ukPaidLive
Live Bitcoin node data (blocks, mempool, fees, addresses), paid per call in USDC or Lightning, no signup.
Other · JSON
—
OpenAPI spec · llms.txt
CryptoLabelFreeLive
Resolves Bitcoin, Ethereum and Tron addresses into known entity names and public risk/activity labels.
None · JSON
Unlimited
OpenAPI spec · llms.txt
Deep Blue AlphaFreemiumDegraded
Real-time Ethereum whale-wallet tracking: DEX swaps, exchange flows, and sentiment scoring.
API key · JSON
Unlimited
llms.txt
EtherscanFreemiumLive
Ethereum and 60+ EVM chain blockchain data: balances, transactions, contracts, token transfers.
API key · JSON
10k+/day
MCP server · llms.txt
EthplorerFreemiumLive
Ethereum token balances, prices, transactions, and contract data across several EVM chains.
API key · JSON
1k–10k/day
no machine-readable spec
GetBlockFreemiumLive
JSON-RPC node access to 130+ blockchains (Ethereum, Bitcoin, Solana, and more) for on-chain data.
API key · JSON
10k+/day
llms.txt
Helium Entity APIFreeLive
Look up Helium network Hotspot metadata, wallet Hotspot lists and OUI organizations on Solana.
None · JSON
Unlimited
llms.txt
INFURA EthereumFreemiumUntested
Hosted Ethereum node access (mainnet and testnets) via JSON-RPC, over HTTPS or WebSocket.
API key · JSON
—
no machine-readable spec
MempoolFreemiumLive
Live Bitcoin mempool, fee estimates, block, address and Lightning Network data.
None · JSON
—
no machine-readable spec
monerometricsFreeLive
Monero network health, reorg detection, mining-pool centralization, and live Haveno XMR/USD market data.
None · JSON
Unlimited
OpenAPI spec · llms.txt
Moralis NFT APIPaidLive
NFT metadata, owners, transfers, collections and floor prices across Ethereum and other EVM chains.
API key · JSON
—
no machine-readable spec
NOWNodesFreemiumUntested
Blockchain node access (JSON-RPC, WebSocket, gRPC, Blockbook) on 120+ networks, with free public RPC.
API key · JSON
1k–10k/day
llms.txt
OpenChainBenchFreeLive
Live, reproducible benchmarks for crypto infrastructure: RPC latency, bridge fees, oracle deviation.
None · JSON
Unlimited
OpenAPI spec · llms.txt
Paycoin IndexFreeLive
Hourly-updated index of stablecoin transfer costs across 9 blockchains, with daily history and source data.
None · JSON
Unlimited
llms.txt
Solana JSON RPCFreeUntested
Query Solana blockchain state, transactions and account data via JSON-RPC over the public mainnet endpoint.
None · JSON
—
llms.txt
SoloLuckFreeLive
Bitcoin solo-mining pool stats, per-address miner data, and an open dataset of verified solo-mined blocks.
None · JSON
10k+/day
llms.txt
SteemFreeUntested
JSON-RPC API for the Steem blockchain: blocks, accounts, balances and blogging/social content.
None · JSON
Unlimited
no machine-readable spec
SwiftNodesFreemiumUntested
JSON-RPC and WebSocket access to 75+ blockchains (Ethereum, Solana, Bitcoin, Cosmos, etc.) via one API key.
API key · JSON
1k–10k/day
llms.txt
The GraphFreemiumUntested
GraphQL access to indexed on-chain data (subgraphs) across Ethereum and other blockchain networks.
API key · JSON
1k–10k/day
llms.txt
WatchDataFreemiumLive
Node access (Ethereum, Bitcoin, Tron, BSC, Polygon) plus a token price and transfer-history API.
API key · JSON
—
llms.txt
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Choosing a Blockchain Data & Nodes API
Is there a free Blockchain Data & Nodes API?
Yes. Bitcoin Halving, BTCGlobe, CryptoLabel, Helium Entity API, monerometrics and 5 others are free to use, and Etherscan, INFURA Ethereum, Mempool, Alchemy NFT API, Blockchain.com Data API and 9 others have a free tier alongside paid plans.
Which Blockchain Data & Nodes APIs work without an API key?
Mempool, Bitcoin Halving, Blockchain.com Data API, Blockscout, BTCGlobe and 8 others need no key or sign-up, so you can try them with a plain request.
Can I call a Blockchain Data & Nodes API from front-end JavaScript?
Mempool, Bitcoin Halving, Blockscout, BTCGlobe, CryptoLabel and 4 others allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.
Can I use Blockchain Data & Nodes APIs in a commercial project?
INFURA Ethereum, Alchemy NFT API, Bitcoin Halving, Bitquery, btcnode.uk and 9 others permit commercial use. Etherscan restricts it, for example to non-commercial or attributed use, so read the terms first.
Which Blockchain Data & Nodes APIs work with AI agents?
Etherscan, Bitquery and Blockscout have an MCP server, so an AI agent can call them directly. Blockchain.com Data API, Blockfrost, btcnode.uk, CryptoLabel, monerometrics and 1 other publish an OpenAPI spec for generating clients and tools.
More specific: Bitcoin APIs · Ethereum APIs · Solana APIs · RPC Nodes APIs · Crypto Wallet APIs · NFT APIs
More in Crypto: Market Data APIs · DeFi & DEX APIs · Crypto Payments APIs