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AgentSpendGuard x402 Endpoint Risk Preflight API
x402
AgentSpendGuard x402 Endpoint Risk Preflight API is a paid API for AI agents from api-production-2800.up.railway.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Performs risk assessment on an x402 payment endpoint before an autonomous agent pays, returning an allow/caution/block verdict with score, reason codes, and evidence.
Price / call$0.003
Success—
StatusUnknown
Output
A strict JSON object containing a verdict of 'allow', 'caution', or 'block'; a numeric risk score; reason codes explaining the assessment; evidence data (e.g. unique payer count, recent call volume, CDP Bazaar discovery status, price anomalies, metadata quality, network match); and suggested alternative endpoints when available.
Example use cases
Example prompt
“Before paying that x402 API at https://api.example.com/data, run a risk preflight on it and tell me whether I should allow, caution, or block the payment — show me the risk score and any red flags like low payer count or metadata issues.”
Technical details
Endpoint
POSThttps://api-production-2800.up.railway.app/v1/x402-riskWhen to prefer
Use this endpoint when an AI agent is about to pay an unknown or first-seen x402 resource and needs a fast, structured risk verdict before committing funds. Ideal for autonomous buyer agents operating without human oversight that need a guardrail layer. Prefer this over manual checks when you need CDP Bazaar discovery status, payer history, and metadata quality bundled into a single scored verdict.
Side effects
- Endpoint URL not reachable or malformed — returns error or block verdict
- x402 endpoint not found in CDP Bazaar — flagged as undiscovered, may return caution/block
- Network mismatch between specified network and endpoint's actual network — returns block with network_mismatch reason code
- Price outside expected range — returns caution or block with price_anomaly reason code
- Low or zero unique payer count — returns caution or block with low_adoption reason code
- Service unavailable — HTTP 500 or timeout from the railway.app host
Input
{
"input": {
"body": {
"payTo": "0x1234567890123456789012345678901234567890",
"expectedNetwork": "eip155:8453",
"expectedMaxPriceUsd": 100,
"requireRecentActivityDays": 30
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
}Output
{
"score": 40,
"matched": false,
"quality": {
"l30DaysTotalCalls": 0,
"l30DaysUniquePayers": 0,
"metadataQualityScore": 0
},
"reasons": [
{
"code": "X402_RESOURCE_NOT_DISCOVERED",
"message": "The endpoint was not found in CDP Bazaar discovery. It may be new, unindexed, or risky to call without more evidence.",
"evidence": [],
"severity": "warning"
}
],
"verdict": "caution",
"decision": {
"retryable": true,
"shouldPay": false,
"requiresHumanReview": true,
"maxRecommendedPriceUsd": 100
},
"riskLevel": "high",
"alternatives": [],
"recommendedAction": "Do not auto-pay this endpoint unless the buyer explicitly trusts the seller or has independent evidence."
}Tags
x402
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