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GW8 Signal API – Seller Reputation Verdict
x402
GW8 Signal API – Seller Reputation Verdict is a paid API for AI agents from micro-saas-agent.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).
Returns a scored reputation verdict (0-100, safe/caution/danger) for an x402 API seller address or endpoint, based on payment history, buyer diversity, wash trading, and wallet age.
Price / call$0.01
Success—
StatusUnknown
How this service works
[Seller reputation: x402 seller risk check, verdict] Before an AI agent pays an x402 seller: POST {address} (Base wallet) and/or {endpoint} (x402 URL; payTo read from its 402). Returns score 0-100 + trusted / caution / avoid / unknown from public USDC history: distinct buyers, wash share, wallet age, top-payer share, 30d volume, with reasons and a signed receipt. Stateless; never pays anyone. No charge on bad body or if data is down. $0.01 USDC.
Output
A JSON object containing: a numeric reputation score (0-100), a verdict string (safe/caution/danger), a list of human-readable reasons, a breakdown of component scores (30-day volume, wallet age, wash share, concentration, distinct buyers), and a signed Ed25519 reputation receipt with a verification URL for tamper-proof auditability.
Example use cases
Pre-payment seller vetting for autonomous agent
“My agent is about to pay an x402 seller at address 0xAbCd1234... for market data — can you check their reputation over the last 60 days and tell me if they're trustworthy before we send any USDC?”
Wash trading detection for API marketplace
“I want to know if the seller behind https://some-data-api.xyz/api/prices has inflated their transaction history with wash trades — run a 90-day reputation check on them and flag any concentration or wash-share issues.”
Onboarding audit for a new x402 data vendor
“We're evaluating a new pay-per-call data provider at wallet 0xDeF9876... — can you pull their seller reputation score and break down why they got that score, looking back 30 days?”
Technical details
Endpoint
POSThttps://micro-saas-agent.onrender.com/api/seller/reputation?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to vet an x402 API seller before spending USDC — especially when wash trading risk, buyer concentration, or seller wallet age are concerns. Prefer this over generic blockchain analytics when you need a single opinionated verdict (safe/caution/danger) with signed proof, specifically calibrated for the x402 pay-per-call ecosystem.
Side effects
- Unknown seller address returns a low score with limited data components
- Address with zero payment history may return minimal signal and a caution/danger verdict by default
- Invalid Ethereum address format causes a 400 validation error
- lookbackDays outside supported range may return an error or be clamped
- Service unavailability on render.com hosting returns a 5xx error
- Payment failure via x402 means no charge and no data returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | |
| endpoint | string | |
| lookbackDays | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"score": 58,
"engine": "gw8-seller-reputation/1",
"reasons": [
"only 4 distinct organic paying buyer(s)"
],
"verdict": "caution",
"components": {
"volume30d": {
"max": 10,
"points": 3,
"organicUsd": 0.6
},
"walletAge": {
"max": 15,
"days": 86,
"points": 10
},
"washShare": {
"max": 25,
"value": 0.1,
"points": 23
},
"concentration": {
"max": 20,
"points": 14,
"topPayerShare": 0.45
},
"distinctBuyers": {
"max": 30,
"value": 4,
"points": 12
}
},
"reputationReceipt": {
"alg": "Ed25519",
"query": {
"score": 58,
"verdict": "caution",
"dataSha256": "…",
"requestSha256": "…"
},
"signed": true,
"endpoint": "POST /api/seller/reputation",
"accessType": "SELLER_REPUTATION",
"verify_url": "https://micro-saas-agent.onrender.com/api/receipt/verify"
}
}
}Tags
x402
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