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x402-secure Agent Payment Evaluation
x402
x402-secure Agent Payment Evaluation is a paid API for AI agents from x402-secure-api.t54.ai, paid per call via x402, $0.0001/call, status unknown (last checked 2026-09-14).
Evaluates an agent's pending payment plan by analyzing its execution trace, returning a risk decision (allow/deny/challenge) with confidence score and risk level
Price / call$0.0001
Success—
StatusUnknown
How this service works
Evaluate an agent's pending payment plan by submitting agent_id, wallet_address, and a full agent_trace. Returns a normalized summary acknowledging the payload. Price: $0.0001 USDC
Output
Returns a structured decision object containing: a decision field (allow/deny/challenge), risk_level (low/medium/high/critical/unknown), confidence_score, list of reasons and warnings, trace_id, session_id, decision_id, ttl_seconds indicating how long the decision is valid, and a flag indicating whether a mandate was used.
Example use cases
Example prompt
“Can you evaluate whether agent_123 at wallet address 0xABC...123 should be allowed to make this payment? Here's the full execution trace showing the task it completed and all the events it triggered — I need a risk decision with confidence score before I approve anything.”
Technical details
Endpoint
POSThttps://x402-secure-api.t54.ai/x402/tools/evaluate_agent_paymentWhen to prefer
Use this endpoint when an AI agent needs a security gate before executing a blockchain payment — specifically when you have a full agent execution trace and need a structured allow/deny/challenge decision with risk scoring. Prefer this over generic fraud checks when working within the x402 payment protocol ecosystem on Base L2 or similar chains.
Side effects
- Missing required fields (agent_id, wallet_address, agent_trace, authorization) returns 400 validation error
- Invalid or expired authorization token returns 401 unauthorized
- Malformed agent_trace object (missing task, events, or completed_at) may result in low-confidence or unknown risk decision
- Network timeout if trace payload is excessively large
- Service unavailability returns 503 with health check recommended
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| agent_idrequired | string | Unique identifier of the agent performing the action (e.g., 'agent_123'). |
| agent_tracerequired | object | Agent execution trace object. Include 'task' (string), 'events' (array of event objects with fields like 'ts', 'type', 'role'/'name', 'content'/'arguments'/'result'), and 'completed_at' (ISO timestamp). This field is nested; provide the full trace payload for evaluation. |
| authorizationrequired | string | Upstream Authorization token. |
| wallet_addressrequired | string | User or agent wallet address on chain (e.g., Base L2 address). |
Output
Schema · Response
{
"extra": {
"type": "object",
"properties": {
"mode": "string",
"final_tier": "string",
"confidence_score": "number",
"processing_time_ms": "number"
}
},
"reasons": "array",
"decision": {
"enum": [
"allow",
"deny",
"challenge"
],
"type": "string"
},
"trace_id": "string",
"warnings": "array",
"risk_level": {
"enum": [
"low",
"medium",
"high",
"critical",
"unknown"
],
"type": "string"
},
"session_id": "string",
"decision_id": "string",
"ttl_seconds": "number",
"used_mandate": "boolean"
}Tags
x402
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