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Financial Data x402 – Smart Contract Source Lookup
x402
Financial Data x402 – Smart Contract Source Lookup is a paid API for AI agents from x402financialdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-08).
Retrieves verified ABI, source code, and metadata for a smart contract at a given blockchain address via pay-per-call x402 micropayment.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call stock, macro, on-chain, and crypto data over the x402 protocol. USDC on Base or Solana, no API keys, no subscriptions.
Output
Returns a JSON object containing the contract's ABI (array of function/event descriptors), raw Solidity source code, contract name, compiler version, chain identifier, whether the contract is verified, whether optimization was used during compilation, whether the contract is a proxy, and the implementation address if applicable.
Example use cases
Audit proxy contract implementation
“I need to check whether the contract at 0x1234567890abcdef1234567890abcdef12345678 is a proxy, and if so what the implementation address is — can you fetch its on-chain metadata?”
Retrieve ABI for DeFi integration
“Get me the full ABI for the deployed contract at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 so I can figure out which functions it exposes.”
Verify compiler and optimization settings
“What compiler version and optimization settings were used to deploy the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48? I want to make sure it matches the published source.”
Technical details
Endpoint
GEThttps://x402financialdata.com/contract-source/%7Baddress%7DWhen to prefer
Choose this endpoint when you need on-chain smart contract source code, ABI, and deployment metadata without setting up API keys or subscriptions — especially in agent workflows that pay micropayments per call via the x402 protocol using USDC on Base or Solana. Prefer it over Etherscan API or similar when you want a pay-as-you-go, keyless approach suitable for autonomous agents.
Side effects
- Invalid or malformed contract address returns an error or empty result
- Unverified contracts may return partial data or no source code
- Contract addresses on unsupported chains return no data
- Payment failure via x402 protocol results in HTTP 402 and no data returned
- Network timeouts on slow RPC nodes may delay response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"abi": [
{
"name": "someFunction",
"type": "function",
"inputs": [],
"outputs": [],
"constant": false
}
],
"chain": "eth",
"address": "0xbb9bc244d798123fde783fcc1c72d3bb8c189413",
"is_proxy": false,
"verified": true,
"source_code": "pragma solidity ^0.4.26;\n\ncontract Test12345 { ... }",
"contract_name": "Test12345",
"compiler_version": "v0.4.26+commit.4563c3fc",
"optimization_used": true,
"implementation_address": null
}
}Tags
x402
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