Data

OneSource

onesource.io

OneSource is an RPC API for Ethereum mainnet and Sepolia with 25 pay-per-call endpoints (blocks, balances, transactions, receipts, event logs, ENS, contracts, NFTs) payable in USDC on Base via x402, with no API key.

Back to x402 service market

Current block number for a chain.

GET

https://api.onesource.io/api/chain/block-number

Query parameters

Raw contract call on a chain.

POST

https://api.onesource.io/api/chain/call

Query parameters

Example request body

Contract bytecode for an address.

GET

https://api.onesource.io/api/chain/code/:address

Contract details for an address.

GET

https://api.onesource.io/api/chain/contract/:address

Resolve an ENS name or address.

GET

https://api.onesource.io/api/chain/ens/:input

ERC-20 transfers for an address.

GET

https://api.onesource.io/api/chain/erc20-transfers

Query parameters

Estimate gas for a transaction.

POST

https://api.onesource.io/api/chain/estimate-gas

Query parameters

Example request body

Chain network information.

GET

https://api.onesource.io/api/chain/network-info

Query parameters

Transaction nonce for an address.

GET

https://api.onesource.io/api/chain/nonce/:address

Transaction receipt for a hash.

GET

https://api.onesource.io/api/chain/receipt/:hash

Service information

Provider: onesource.io
Category: Data
Uptime (30 days): 14.2%
Avg response time (30 days): 106 ms
Information updated: Aug 31, 2026

Transactions · 30 days

Volume: 0 USDC
Transactions: 0
Payer addresses: 0

Based on Base USDC records and updated hourly. This does not represent fulfilled sales.

Service tags

ethereum

sepolia

blocks

balances

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