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Vextorium Contract Verification Checker
x402
Vextorium Contract Verification Checker is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-11).
Checks whether a smart contract's source code is verified and public on Sourcify for any EVM-compatible chain, returning match type, contract name, compiler version, and function list.
Price / call$0.004
Success—
StatusUnknown
How this service works
Checks whether a smart contract's source code is verified and public on Sourcify, on any EVM chain: match type, contract name, compiler, number of functions and a sample. Verified code = transparent and auditable (not a safety guarantee). Live from Sourcify.
Output
Returns a JSON object with: verified (boolean), match type (e.g. 'match'), contract name, compiler version, network name, chain ID, number of public functions, a sample list of function names, verification date, and a note clarifying that verification means transparency, not safety. Source is live Sourcify data.
Example use cases
DeFi protocol due diligence
“Before I interact with this DeFi protocol, can you check if the contract at 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D on Ethereum is verified on Sourcify? I want to know the contract name, compiler version, and whether the source code is actually public.”
Token contract transparency check
“I'm researching this token — can you verify whether the contract 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 on Ethereum has its source code verified? Tell me the match type and how many functions it has.”
Multi-chain smart contract audit prep
“Can you check if the contract 0x4200000000000000000000000000000000000006 deployed on Base has verified source code on Sourcify? I need to know if it's auditable before my team reviews it.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/contract-verified?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to confirm whether a specific smart contract's source code is publicly available and auditable on Sourcify across any EVM chain. Prefer this over block explorer APIs (Etherscan, etc.) when you want a chain-agnostic verification check that works across Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, and many other EVM networks in a single call. Ideal for pre-interaction due diligence, DeFi protocol research, or feeding contract metadata into an AI agent pipeline.
Side effects
- Contract not verified — returns verified: false with null fields for match/compiler/functions
- Invalid or malformed contract address — likely returns an error or unverified response
- Unsupported network/chain — chain not indexed by Sourcify may return unverified
- Contract deployed but source never submitted to Sourcify — returns verified: false
- Network connectivity or Sourcify API downtime — may result in upstream error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Verified code = what the contract does is public and auditable. It does not guarantee it is safe. Source: Sourcify.",
"match": "match",
"source": "Sourcify (sourcify.dev)",
"address": "0xdAC17F958D2ee523a2206206994597C13D831ec7",
"network": "ethereum",
"chain_id": 1,
"compiler": "0.4.18+commit.9cf6e910",
"verified": true,
"functions": [
"name",
"deprecate"
],
"verified_on": "2024-08-08T13:56:23Z",
"contract_name": "TetherToken",
"num_functions": 32
}
}Tags
x402
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