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Agent Buyer Identity Preflight | x402 Purchase Governance
x402
Agent Buyer Identity Preflight | x402 Purchase Governance is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-14).
Performs a pre-purchase risk and identity check on a merchant wallet before an AI agent executes an x402 micropayment, returning a risk score and flags.
Price / call$0.15
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
Returns a JSON object containing the network (eip155:8453 for Base), product identifier, risk_score (0–1 numeric), risk_level (e.g. 'low', 'medium', 'high'), an array of flags describing specific concerns, an identity object with wallet provenance details, and an activity summary covering recent on-chain behavior within the specified time window.
Example use cases
Safe merchant check before API purchase
“My AI agent is about to pay 0x4f8a...c291 on Base for access to a weather data API — can you run a preflight check on that merchant wallet and tell me the risk score before we proceed?”
Verify payment recipient for dataset access
“Before sending 5.00 USDC to 0x9d3b...17ae as the expected recipient for that genomics dataset, check whether that wallet address passes the x402 governance preflight and flag any issues.”
Governance review using known transaction hash
“We just saw a transaction hash 0x8f2e1a...b4c9d on Base — can you run a preflight assessment on merchant 0x7c1d...e8a2 using that tx as proof and tell me the risk level and any flags?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/transaction/preflight-liteWhen to prefer
Choose this endpoint when an AI agent needs to perform a governance preflight check before executing an x402 micropayment on the Base network — specifically when you want a structured risk score and flags on a merchant wallet before committing funds. Prefer this over generic on-chain explorers when you need a single opinionated risk/identity verdict rather than raw transaction data, and when operating in an automated agentic payment workflow where a human approval gate is not present.
Side effects
- Missing required merchant_address parameter returns 400 validation error
- Invalid Ethereum address format (not 0x + 40 hex chars) causes schema rejection
- Unknown or brand-new wallet with no on-chain history may return empty activity and indeterminate risk
- Invalid transaction hash format (not 0x + 64 hex chars) returns validation error
- Cloudflare Worker cold-start or rate limiting may return 503 or timeout
- Wallet on a network other than Base (eip155:8453) may return unsupported network error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "x402-transaction-preflight-lite",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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