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SignGate Agent Buyer Identity Preflight – Transaction Decode Risk
x402
SignGate Agent Buyer Identity Preflight – Transaction Decode Risk is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Decodes and risk-scores an on-chain transaction before an AI agent pays for an x402 resource, flagging mismatches between buyer identity, product category, price, and approval policy.
Price / call$0.01
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 a risk_level (e.g. 'low', 'medium', 'high'), a numeric risk_score, an array of risk flags, plus contextual fields for network, product, identity, activity, and provenance — giving the agent a clear go/no-go signal before signing the payment.
Example use cases
Pre-authorize x402 API purchase
“My agent is about to pay for an x402 data API — can you decode the transaction and give me a risk score before it goes through? The recipient is 0xDEAD1234567890abcdef1234567890abcdef1234 on Base (eip155:8453), calldata is 0xa9059cbb000000, and the value is 0.50 USDC.”
Screen high-value dataset purchase
“My AI agent wants to buy an x402 dataset for 25.00 USDC on eip155:8453 — run a transaction decode risk check against recipient 0xBEEF5678901234abcdef5678901234abcdef5678 with calldata 0x23b872dd before I let it proceed.”
Validate agent role fits product category
“Before my autonomous agent approves this x402 tool purchase, check whether the buyer role matches the product category and sensitivity — the transaction is on Base, recipient 0xCAFE9012345678abcdef9012345678abcdef9012, calldata 0x, value 5.00 USDC.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent-risk/transaction-decode-riskWhen to prefer
Choose this endpoint when an AI agent is operating within the x402 micropayment ecosystem on EVM-compatible chains (especially Base) and needs a lightweight, on-the-fly risk assessment before authorizing a payment. It is purpose-built for agent-governed purchasing workflows where buyer identity, product sensitivity, and approval policy must align before funds are spent — not for general blockchain analytics or wallet monitoring.
Side effects
- Invalid 'to' address format returns a validation error (must match ^0x[a-fA-F0-9]{40}$)
- Invalid or missing 'chain' parameter causes a 400 bad request
- Malformed or oversized calldata (>4096 chars) is rejected
- Missing required query parameters 'chain' or 'to' returns an error
- Unrecognized chain label may result in an unknown network assessment
- Service unavailable on Cloudflare Worker returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "transaction-decode-risk",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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