# x402 Seller Trust Score > x402 Seller Trust Score is a paid API for AI agents from x402-endpoints.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17). Analyzes an x402 seller wallet's on-chain USDC settlement history on Base to produce a trust score, verdict, and signed receipt for pre-payment due diligence ## Facts - Endpoint: GET https://x402-endpoints.onrender.com/x402/seller-trust?utm_source=zero.xyz - Price: $0.01/call - Payment: x402 - Status: unknown - Last checked: 2026-10-17 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/x402-seller-trust-score-401950c0 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A_E6w0IFD-GawfjZhWemQ Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability x402-seller-trust-score-401950c0 ``` Example prompt: Before my agent pays this x402 seller, run a shallow trust check on wallet 0x1D1B81247C407521E2A01F3E21514870dcf1620f and tell me the trust score, verdict, and how many unique counterparties have paid them on Base. ## When to prefer this Use this endpoint when an AI agent is about to pay an x402 API and needs machine-readable pre-payment clearance on the seller's wallet. It is specifically designed for the x402 micropayment ecosystem where no API key exists and payment is authentication — making trust verification critical before spending funds. Prefer this over generic blockchain explorers when you need a structured verdict, OFAC screening, and a cryptographically signed receipt in a single call. ## Known failure modes - Invalid wallet address format (not 0x + 40 hex) — returns 400 validation error - Unknown or zero-activity wallet — returns low trust score or UNTRUSTED verdict with sparse metrics - OFAC list unavailable — ofac_list_loaded: false, verdict may be degraded - Chain data temporarily unavailable — cached: false with stale or missing metrics - Payment not received (x402 protocol failure) — 402 Payment Required before data is returned ## How this service works Score an x402 seller wallet BEFORE paying it: verdict TRUSTED/CAUTION/AVOID + confidence from its on-chain settlement graph on Base — settlement count, unique paying counterparties, wallet age, wash-trade and sybil signals — with a signed, offline-verifiable receipt. Vet an unknown x402 endpoint or merchant wallet before you pay: scam, fake-volume wash-trader or sybil cluster? Agent counterparty risk, seller reputation and trust score for x402 / agentic payments. ## Output Returns a structured JSON with: trust_score (0-100), verdict (TRUSTED/UNTRUSTED), confidence (0-1), wallet_age_days, settlement_count, received_volume_usdc, unique_counterparties, top_counterparty_share, amount_uniformity, one_shot_payer_ratio, an array of reason codes with labels and weights, OFAC screening status, data freshness metadata, and a signed ed25519 receipt with verifiable claims about the verdict. ## Request schema (JSON Schema) ```json { "type": "object", "$schema": "https://json-schema.org/draft/2020-12/schema", "required": [ "input" ], "properties": { "input": { "type": "object", "required": [ "type", "method" ], "properties": { "type": { "type": "string", "const": "http" }, "method": { "enum": [ "GET", "HEAD", "DELETE" ], "type": "string" }, "queryParams": { "type": "object", "required": [ "seller_wallet" ], "properties": { "depth": { "type": "string", "description": "'shallow' (~200 settlements) or 'deep' (~500)" }, "seller_wallet": { "type": "string", "pattern": "^0x[a-fA-F0-9]{40}$", "description": "x402 seller payTo wallet (0x + 40 hex)" } } } }, "additionalProperties": false }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "type": "string" }, "example": { "type": "object" } } } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "error": null, "query": { "depth": "shallow", "seller_wallet": "0x1D1B81247C407521E2A01F3E21514870dcf1620f" }, "cached": false, "metrics": { "wallet_age_days": 168, "first_settlement": "2026-01-12T09:00:00Z", "settlement_count": 213, "amount_uniformity": 0.18, "one_shot_payer_ratio": 0.62, "received_volume_usdc": 19.4, "unique_counterparties": 47, "top_counterparty_share": 0.11, "counterparty_diversity_ratio": 0.221 }, "reasons": [ { "code": "UNIQUE_COUNTERPARTIES", "label": "47 distinct paying counterparties", "weight": -0.5 }, { "code": "COMPOSITE_SCORE", "label": "Composite trust score 88/100", "weight": -0.1 } ], "verdict": "TRUSTED", "timestamp": "2026-06-29T12:00:00Z", "confidence": 0.82, "disclaimer": "Trust derived from incoming USDC transfers on Base as a settlement proxy; not all incoming USDC is an x402 settlement. Not advice.", "trust_score": 88, "data_freshness": { "as_of": "2026-01-12T09:00:00Z", "chain": "base", "sources": [ "Base Blockscout USDC transfers (settlement proxy)", "OFAC SDN crypto addresses" ], "age_seconds": 14515200, "retrieved_at": "2026-06-29T12:00:00Z", "deterministic": true, "ofac_list_loaded": true }, "signed_receipt": { "claims": { "kind": "x402_seller_trust", "issuer": "x402-endpoints.onrender.com", "verdict": "TRUSTED", "issued_at": "2026-06-29T12:00:00Z", "trust_score": 88, "seller_wallet": "0x1D1B...620f", "settlement_count": 213, "unique_counterparties": 47 }, "algorithm": "ed25519", "available": true, "signature": "", "public_key": "5b77f2e95c3eee40403453e942834b703383e15fca50d11fdd28633ca5dd9f9d" } } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-seller-trust-score-401950c0/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from x402-endpoints.onrender.com](https://www.zero.xyz/host/x402-endpoints.onrender.com/llms.txt)