# Vextorium Contract Verification Checker

> 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.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/contract-verified?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-contract-verification-checker-eea3f2b6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AoW2a7u5eUC_f8w8Htvbf

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vextorium-contract-verification-checker-eea3f2b6 -d '<json body>'
```

Example prompt: Can you check if the contract at 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Ethereum is verified on Sourcify — I want to know if its source code is public, what it's called, and what functions it exposes?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "Contract address (0x…)"
      },
      "network": {
       "type": "string",
       "description": "Chain: ethereum, base, arbitrum, optimism, polygon, bsc… or a chainId"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "note": {
       "type": [
        "string",
        "null"
       ]
      },
      "match": {
       "type": [
        "string",
        "null"
       ]
      },
      "source": {
       "type": [
        "string",
        "null"
       ]
      },
      "address": {
       "type": [
        "string",
        "null"
       ]
      },
      "network": {
       "type": [
        "string",
        "null"
       ]
      },
      "chain_id": {
       "type": [
        "number",
        "null"
       ]
      },
      "compiler": {
       "type": [
        "string",
        "null"
       ]
      },
      "verified": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "functions": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "string"
        ]
       }
      },
      "verified_on": {
       "type": [
        "string",
        "null"
       ]
      },
      "contract_name": {
       "type": [
        "string",
        "null"
       ]
      },
      "num_functions": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-contract-verification-checker-eea3f2b6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)