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Agent Payment Guard — x402 Server Trust Assessment
x402
Agent Payment Guard — x402 Server Trust Assessment 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).
Returns a risk score, risk level, and flags for a given x402 payment server URL to help AI agents decide whether to trust and pay it.
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
A JSON object containing the network (e.g. eip155:8453), product identifier ('x402-server-trust'), and an assessment object with risk_score (numeric), risk_level (e.g. 'low', 'medium', 'high'), and a flags array listing any detected risk signals, plus optional activity, identity, and provenance objects.
Example use cases
Pre-payment fraud screen for agent
“My AI agent is about to autonomously pay an x402 server at https://data.somevendor.io — before it sends any USDC, can you run a trust and risk check on that URL? The seller address is 0xabc123, it's on Base, and the listing claims about 80 transactions and 5000 USDC in volume.”
Dataset purchase risk assessment
“I found an x402-gated dataset at https://datasets.researchprovider.com/climate-data that my agent wants to buy for 25 USDC on Base. Can you do a preflight risk assessment on that payment server before I let my agent proceed — I want to know the risk score, risk level, and any red flags?”
Batch screen multiple x402 endpoints
“My agent is comparing three x402 API tools to purchase and I want to screen them for fraud before it commits. Can you check the trust score for https://tools.providerA.com/summarize — it's on Base, the seller address is 0xdef456, and the marketplace shows 12 transactions and 300 USDC volume so far?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/x402/server-trustWhen to prefer
Use this endpoint when an AI agent is about to make an autonomous x402 payment and needs a pre-flight risk assessment of the target server. Prefer this over generic URL reputation services because it is x402-protocol-aware, understands seller addresses, on-chain transaction counts, and USDC volume signals specific to the x402 ecosystem.
Side effects
- Missing required server_url parameter returns a validation error
- Invalid seller address format (not 0x + 40 hex chars) causes a 400 error
- Unreachable or unknown server_url may return a higher risk_score or empty provenance
- Rate limiting or quota exhaustion returns a 429 or payment-required response
- Malformed numeric query params (txns, buyers, volume_usdc) fail schema validation
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "x402-server-trust",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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