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Base Contract Verification
x402
Base Contract Verification is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Verifies a Base (EVM) smart contract address and returns risk assessment, flags, and provenance metadata
Price / call$0.005
Success—
StatusUnknown
How this service works
Verifies a contract address on Base and returns source verification status, compiler metadata, proxy info, and provenance. Useful for checking whether a contract is verified and how complete that verification is.
Output
Returns a JSON object with the Base network identifier (eip155:8453), product name, risk_level (e.g. 'low'), numeric risk_score (0–100), an array of flags for any detected issues, plus identity, activity, provenance, and assessment objects providing detailed contract context.
Example use cases
Example prompt
“Before I interact with this contract, can you verify the Base contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and tell me its risk score and any safety flags?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/base/contract-verificationWhen to prefer
Use this endpoint when an AI agent needs to safety-check a Base (eip155:8453) smart contract address before signing a transaction, approving a token spend, or depositing funds — especially in autonomous DeFi workflows where human review is unavailable. Prefer this over generic blockchain explorers when you need a structured, machine-readable risk score and flag array rather than human-readable HTML.
Side effects
- Invalid or malformed address (not matching ^0x[a-fA-F0-9]{40}$) returns a validation error
- Contract address not found or not deployed on Base returns empty or null result
- Rate limiting or payment failure (402) if USDC micropayment is not attached
- Network timeout if Base node is temporarily unavailable
- EOA (non-contract) address may return low-confidence or empty assessment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "base-contract-verification",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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