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Best pay-per-call onchain data APIs for AI agents (September 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Sep 29, 2026 · 9 agents searched Zero for this in the last 90 days

Zero indexes 28 pay-per-call services for onchain data. Of the 10 ranked here, 10 answered a live probe in the last 7 days. Quoted prices run from $0.001 to $0.1 per call, median $0.01, paid per call over x402 or MPP with no API key. None has recorded agent calls in the last 30 days, so the order below is set by reviews and how closely each matches the use case. The cheapest live option is Codex GraphQL API at $0.001.

  1. chainray.onlineChainRay Contract Scanx402

    Scans a smart contract or wallet address on a specified blockchain and returns on-chain intelligence about it

    $0.02/message

    Live · checked Sep 28, 20260 calls · 30 days

  2. chainray.onlineChainRay Cross-Chain Address Lookupx402

    Retrieves on-chain data and intelligence for a given wallet or contract address across multiple blockchain networks

    $0.02/message

    Live · checked Sep 30, 20260 calls · 30 days

  3. chainray.onlineChainRay Wallet Intelligencex402

    Retrieves comprehensive on-chain intelligence and analytics for a specific blockchain wallet address across supported chains

    $0.02/message

    Live · checked Sep 29, 20260 calls · 30 days

  4. graph.codex.ioCodex GraphQL APIgraphql6mpp

    Executes GraphQL queries against Codex's onchain data platform to retrieve token data, trades, liquidity, NFTs, and wallet analytics across 80+ blockchain networks

    $0.001/message

    Live · checked Oct 1, 20260 calls · 30 days

  5. defi-api.agenticfi.wtfAgenticFi Block Height Lookupx402

    Returns the current block height for a specified blockchain network (e.g. Ethereum, Base, Arbitrum)

    $0.001/message

    Live · checked Sep 30, 20260 calls · 30 days

  6. chainray.onlineChainRay Stablecoin Monitorx402

    Monitors stablecoin metrics and health data across specified blockchain networks in real time

    $0.01/message

    Live · checked Oct 2, 20260 calls · 30 days

  7. chainray.onlineChainRay NFT Token Metadata Lookupx402

    Fetches on-chain metadata and details for a specific NFT token by contract address and token ID on a given blockchain network

    $0.001/message

    Live · checked Sep 30, 20260 calls · 30 days

  8. graphadvocate.comGraphAdvocate /route — Plain-English to GraphQL/REST Onchain Data Routerx402

    Converts plain-English queries into working GraphQL or REST calls across 15,500+ blockchain subgraphs on 8 chains, covering protocols like Uniswap, Aave, Compound, ENS, Polymarket, and more

    $0.01/message

    Live · checked Oct 2, 20260 calls · 30 days

  9. pro-api.coingecko.comCoinGecko Pro Onchain Token Price — Base Network (0x00c9c681)x402

    Returns real-time onchain DEX price and market data for a specific token contract (0x00c9c681d803d27d9c2e1e8612de073db0c5c390) on the Base network via CoinGecko Pro.

    $0.010000/message

    Live · checked Oct 2, 20260 calls · 30 days

  10. defi-shield-hazel.vercel.appDeFi Shield Chain Health Monitorx402

    Returns real-time health metrics for a specified blockchain including TVL, gas prices, block production status, finality details, and chain type

    $0.1/message

    Live · checked Oct 2, 20260 calls · 30 days

Call one from an agent

zero fetch --capability chainray-contract-scan-206b4f0b --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.