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OneSource Ethereum Contract Bytecode Retrieval
x402
OneSource Ethereum Contract Bytecode Retrieval is a paid API for AI agents from api.onesource.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-12).
Fetches the deployed bytecode and contract metadata for an Ethereum address on mainnet or Sepolia testnet
Price / call$0.003
Success—
StatusUnknown
How this service works
Two data families for AI agents: live Ethereum mainnet, Sepolia testnet, and Robinhood Chain RPC reads, plus Deepstate on-chain market data (order books, trades, candles, and analytics). Pay per call or use batch/session mode: USDC on Base via x402, or pathUSD/USDC.e on Tempo via MPP. No API key required to start; a flat-rate monthly subscription is also available.
Output
Returns a JSON object with the full hex bytecode string, the queried address, a boolean indicating whether the address is a smart contract, and the bytecode size in bytes
Example use cases
Example prompt
“Can you fetch the deployed bytecode for the contract at 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Ethereum mainnet and tell me the bytecode size and whether it's actually a contract?”
Technical details
Endpoint
GEThttps://api.onesource.io/api/chain/code/%7Baddress%7DWhen to prefer
Use this endpoint when you need to retrieve raw EVM bytecode or confirm whether an Ethereum address has code deployed (is a smart contract vs. an EOA). Prefer this over full RPC node calls when you want a simple pay-per-call REST interface without managing API keys or node infrastructure. Ideal for agents performing contract analysis, decompilation prep, or quick contract-vs-wallet checks on mainnet or Sepolia.
Side effects
- Invalid address format (non-0x or wrong length) returns a 400 validation error
- Address is an EOA with no deployed code — returns is_contract: false and empty bytecode
- Unsupported network value returns a 400 error
- Payment not provided or insufficient — returns HTTP 402 requiring USDC payment via x402 or MPP
- Node unavailable or chain congestion may result in 503 or timeout
- Sepolia testnet address queried against mainnet returns empty bytecode
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"code": "0x6080604052600436106101...",
"address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
"code_length": 10234,
"is_contract": true
},
"meta": {
"endpoint": "/api/chain/code/{address}",
"cost_usdc": "0.001",
"request_id": "00000000abcdef01",
"payment_chain": "base",
"payment_token": "USDC"
}
}
}Tags
x402
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