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VulnHunt Smart Contract Security Snapshot API
x402
VulnHunt Smart Contract Security Snapshot API is a paid API for AI agents from vulnhunt-agent-api-production.up.railway.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Returns a read-only historical security intelligence snapshot for a smart contract, including risk score, bytecode hash, source verification status, and evidence metadata.
Price / call$0.02
Success—
StatusUnknown
How this service works
Read-only historical smart-contract security intelligence for autonomous agents.
Output
Returns a JSON object containing: a risk object with level (e.g. 'low'), numeric score, and disclaimer flags (not_an_audit, not_a_vulnerability_verdict); a contract object with address, is_contract boolean, bytecode SHA256 hash, and verified_source boolean; an evidence object with source_verified and bytecode_present booleans; and a schema_version string.
Example use cases
DeFi protocol safety check before investing
“Before I deposit funds into this DeFi protocol, can you check the security risk score and source verification status for the contract 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D on Ethereum mainnet (chain ID 1)?”
NFT marketplace contract risk assessment
“I'm about to approve a transaction with an NFT marketplace contract at 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB on chain 1 — can you get me a VulnHunt security snapshot to check its risk level and whether the bytecode has been verified?”
Cross-chain bridge contract verification
“Can you check the VulnHunt security intelligence for the bridge contract 0x40ec5B33f54e0E8A33A975908C5BA1c14e5BbbDf on Polygon (chain ID 137) — specifically whether the source is verified and what risk score it has?”
Technical details
Endpoint
GEThttps://vulnhunt-agent-api-production.up.railway.app/v1/contracts/%7Bchain_id%7D/%7Baddress%7D/snapshotWhen to prefer
Choose this endpoint when you need a fast, read-only historical security intelligence snapshot for a specific smart contract on a known chain, particularly for pre-transaction due diligence or DeFi risk screening. It is ideal for agents that need machine-readable risk scores and bytecode/source verification status without requiring a full on-chain audit. Prefer this over general blockchain explorers when you need structured security signals rather than raw transaction data.
Side effects
- Contract address not found on specified chain — returns empty or 404 response
- Invalid chain_id or unsupported blockchain — returns error
- Address is an EOA (externally owned account), not a contract — is_contract will be false
- No historical data available for the contract — may return null risk score
- Malformed address format — returns 400 bad request
- Payment not fulfilled (x402 protocol) — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"risk": {
"level": "low",
"score": 0,
"not_an_audit": true,
"not_a_vulnerability_verdict": true
},
"contract": {
"address": "0x0000000000000000000000000000000000000000",
"is_contract": true,
"bytecode_sha256": "<sha256>",
"verified_source": true
},
"evidence": {
"source_verified": true,
"bytecode_present": true
},
"schema_version": "0.3"
}
}Tags
x402
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