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api.onesource.io

Latest Ethereum block height - current chain tip via eth_blockNumber

Host	api.onesource.io
Price	$0.001–$0.05 per call
Network	Base
Paid endpoints listed	70
Calls, last 30 days*	8,752
Most unique payers on one endpoint (30 days)*	382
Last paid call*	2026-10-16

* From the public x402 Bazaar index (snapshot 2026-10-18T04:07Z); reported by the facilitator, not measured by us.

Endpoints

URL	Method	Price
`https://api.onesource.io/api/chain/block-number` Latest Ethereum block height - current chain tip via eth_blockNumber	GET	$0.001
`https://api.onesource.io/deepstate/v1/book/:book` Deepstate, the on-chain order-book exchange on Robinhood Chain. Order-book snapshot for a market, bids descending and…	GET	$0.005
`https://api.onesource.io/api/chain/erc20-balance` ERC20 token balance for any Ethereum wallet - USDC, USDT, DAI, or any token - via balanceOf (eth_call) on OneSource…	GET	$0.003
`https://api.onesource.io/deepstate/v1/stats/:book` Deepstate, the on-chain order-book exchange on Robinhood Chain. Rolling 24h / 7d / 30d volume and price change for a…	GET	$0.005
`https://api.onesource.io/deepstate/v1/candles/:book` Deepstate, the on-chain order-book exchange on Robinhood Chain. OHLCV candles for a market.	GET	$0.005
`https://api.onesource.io/api/chain/live-balance` Live wallet balance - native ETH plus up to 20 caller-supplied ERC20 tokens in one bounded RPC batch	GET	$0.003
`https://api.onesource.io/api/chain/erc20-transfers` ERC20 Transfer logs via eth_getLogs - raw Transfer events for a token or wallet	GET	$0.005
`https://api.onesource.io/api/chain/contract/:address` Best-effort contract introspection via batched RPC - bytecode presence, token metadata, and ERC20-like/ERC721/ERC1155…	GET	$0.005
`https://api.onesource.io/api/chain/block/:number` Fetch an Ethereum block header and transaction hashes by number, tag, or hex via eth_getBlockByNumber	GET	$0.003
`https://api.onesource.io/api/chain/total-supply` Total supply of an ERC20 or ERC721 token contract via totalSupply (eth_call)	GET	$0.003
`https://api.onesource.io/api/chain/network-info` EVM network info - chain ID, block height, gas price, chain head age, and chain characteristics in one batched RPC…	GET	$0.001
`https://api.onesource.io/api/chain/ens/:input` ENS resolve - turn a .eth name into an address, or an address into its primary .eth name, via eth_call on OneSource…	GET	$0.005
`https://api.onesource.io/api/chain/nonce/:address` Next transaction nonce for any Ethereum wallet via eth_getTransactionCount - how many txs it has sent	GET	$0.003
`https://api.onesource.io/deepstate/v1/markets` Deepstate, the on-chain order-book exchange on Robinhood Chain. Lists the markets this service serves with their token…	GET	$0.005
`https://api.onesource.io/deepstate/v1/trades/:book` Deepstate, the on-chain order-book exchange on Robinhood Chain. Trade tape for a market, newest first.	GET	$0.005
`https://api.onesource.io/api/chain/chain-id` Ethereum chain ID (EIP-155) via eth_chainId - confirm which chain a network is on	GET	$0.001
`https://api.onesource.io/api/chain/events` Query Ethereum contract event logs via eth_getLogs - filter by contract, topic, and block range	GET	$0.005
`https://api.onesource.io/api/chain/tx/:hash` Full Ethereum transaction details by hash via eth_getTransactionByHash - from, to, value, calldata, block	GET	$0.008
`https://api.onesource.io/api/chain/estimate-gas` Estimate the gas a transaction will consume via eth_estimateGas before signing it	POST	$0.004
`https://api.onesource.io/api/chain/receipt/:hash` Transaction receipt via eth_getTransactionReceipt - status, gas, and event logs for a mined Ethereum transaction	GET	$0.005
`https://api.onesource.io/api/chain/nft-metadata` NFT metadata for ERC721 or ERC1155 tokens via eth_call, with IPFS, Arweave, data URI, and public HTTP(S) resolution	GET	$0.008
`https://api.onesource.io/api/chain/allowance` ERC20 allowance via allowance (eth_call) - how much a spender is approved to move from an owner's wallet	GET	$0.003
`https://api.onesource.io/api/chain/erc721-tokens` List every ERC721 NFT token_id a wallet owns in a collection via tokenOfOwnerByIndex (eth_call)	GET	$0.008
`https://api.onesource.io/deepstate/v1/analytics/makers` Deepstate, the on-chain order-book exchange on Robinhood Chain. Per-maker time-at-top, notional rested, fills, and…	GET	$0.02
`https://api.onesource.io/api/chain/code/:address` Check if an Ethereum address is a contract via eth_getCode - returns deployed bytecode	GET	$0.003

Source: x402 Bazaar discovery API (Coinbase CDP) · Licence: Public discovery metadata; descriptions by each provider. Listed in x402 pay-per-call APIs. We list tools; we do not test, rate or endorse them.

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