{ "x402Version": 2, "id": 28458, "slug": "28458", "resource": "https://goodsong.dev/verify/seller", "description": "Verify an x402 seller before paying it: does it exist and respond with a well-formed 402 challenge, is its own declared input/output schema internally consistent, and is its payout address sanctioned? Checked live against the seller itself plus Chainalysis's sanctions oracle and Blockscout (Base payTo addresses only). Confirms the checkable things about a seller check out -- not a guarantee of trustworthiness, which no free source can promise.", "type": "http", "serviceName": "realx402-seller", "resourceType": "Monitoring", "accepts": [ { "scheme": "exact", "network": "eip155:8453", "payTo": "0xf3b36a95913eb2676fcdedb2ba6b0c96ade58de1", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "amount": "5000", "amountUsd": 0.005, "maxTimeoutSeconds": 300 } ], "outputSchema": { "properties": { "example": { "properties": { "canonical": { "type": [ "object", "null" ] }, "checks": { "type": "object" }, "cost": { "type": "object" }, "evidence": { "type": "array" }, "latency_ms": { "type": "integer" }, "verdict": { "enum": [ "confirmed", "contradicted", "unknown" ], "type": "string" } }, "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" }, "extensions": { "bazaar": { "info": { "input": { "body": { "method": "POST", "resource_url": "https://api.example.com/paid-endpoint" }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "example": { "canonical": { "cairn_conformance": { "date": "2026-09-02", "report_url": "https://cairnwake.com/r/df2f7a42.html", "score": { "inconclusive": 0, "observations": 2, "passed": 16, "total": 16 }, "verdict": "PASS" }, "description": "An example x402 service.", "network": "eip155:8453", "payto": "0x0000000000000000000000000000000000dEaD", "resource_url": "https://api.example.com/paid-endpoint", "service_name": "example-service", "tags": [ "example" ], "wallet_age_days": 412.3, "wallet_tx_count": 87 }, "checks": { "declaration_consistent": true, "exists": true, "payto_sanctioned": false }, "cost": { "amount": "0.005", "currency": "USDC" }, "evidence": [ { "retrieved_at": "2026-08-30T12:00:00Z", "source": "direct_fetch", "url": "https://api.example.com/paid-endpoint" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "chainalysis", "url": "https://mainnet.base.org" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "blockscout", "url": "https://api.blockscout.com/v2/api" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "cairn", "url": "https://cairnwake.com/r/df2f7a42.html" } ], "latency_ms": 640, "verdict": "confirmed" }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "description": "Provide the exact x402 resource URL; method defaults to POST.", "properties": { "method": { "description": "HTTP method that triggers the seller's 402 challenge.", "enum": [ "GET", "POST" ], "type": "string" }, "resource_url": { "description": "The x402 resource URL to verify.", "type": "string" } }, "required": [ "resource_url" ] }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST", "PUT", "PATCH" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "properties": { "canonical": { "type": [ "object", "null" ] }, "checks": { "type": "object" }, "cost": { "type": "object" }, "evidence": { "type": "array" }, "latency_ms": { "type": "integer" }, "verdict": { "enum": [ "confirmed", "contradicted", "unknown" ], "type": "string" } }, "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } } }, "tags": [ "seller", "trust", "x402", "due-diligence", "marketplace", "bazaar" ], "sourceHost": "goodsong.dev", "lastUpdated": "2026-10-08T21:57:29.787Z", "quality": { "calls30d": 1, "uniquePayers30d": 1, "lastCalledAt": "2026-10-08T21:57:29.658Z" }, "metadata": { "serviceName": "realx402-seller", "extensions": { "bazaar": { "info": { "input": { "body": { "method": "POST", "resource_url": "https://api.example.com/paid-endpoint" }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "example": { "canonical": { "cairn_conformance": { "date": "2026-09-02", "report_url": "https://cairnwake.com/r/df2f7a42.html", "score": { "inconclusive": 0, "observations": 2, "passed": 16, "total": 16 }, "verdict": "PASS" }, "description": "An example x402 service.", "network": "eip155:8453", "payto": "0x0000000000000000000000000000000000dEaD", "resource_url": "https://api.example.com/paid-endpoint", "service_name": "example-service", "tags": [ "example" ], "wallet_age_days": 412.3, "wallet_tx_count": 87 }, "checks": { "declaration_consistent": true, "exists": true, "payto_sanctioned": false }, "cost": { "amount": "0.005", "currency": "USDC" }, "evidence": [ { "retrieved_at": "2026-08-30T12:00:00Z", "source": "direct_fetch", "url": "https://api.example.com/paid-endpoint" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "chainalysis", "url": "https://mainnet.base.org" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "blockscout", "url": "https://api.blockscout.com/v2/api" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "cairn", "url": "https://cairnwake.com/r/df2f7a42.html" } ], "latency_ms": 640, "verdict": "confirmed" }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "description": "Provide the exact x402 resource URL; method defaults to POST.", "properties": { "method": { "description": "HTTP method that triggers the seller's 402 challenge.", "enum": [ "GET", "POST" ], "type": "string" }, "resource_url": { "description": "The x402 resource URL to verify.", "type": "string" } }, "required": [ "resource_url" ] }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST", "PUT", "PATCH" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "properties": { "canonical": { "type": [ "object", "null" ] }, "checks": { "type": "object" }, "cost": { "type": "object" }, "evidence": { "type": "array" }, "latency_ms": { "type": "integer" }, "verdict": { "enum": [ "confirmed", "contradicted", "unknown" ], "type": "string" } }, "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } } } }, "liveness": { "reliability": null }, "verified": false, "featured": false, "provider": { "host": "goodsong.dev", "manifest_name": "goodsong.dev", "source": "cdp-mirror", "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources", "submitted_at": "2026-10-14T01:15:01.050Z" }, "exampleResponse": { "canonical": { "cairn_conformance": { "date": "2026-09-02", "report_url": "https://cairnwake.com/r/df2f7a42.html", "score": { "inconclusive": 0, "observations": 2, "passed": 16, "total": 16 }, "verdict": "PASS" }, "description": "An example x402 service.", "network": "eip155:8453", "payto": "0x0000000000000000000000000000000000dEaD", "resource_url": "https://api.example.com/paid-endpoint", "service_name": "example-service", "tags": [ "example" ], "wallet_age_days": 412.3, "wallet_tx_count": 87 }, "checks": { "declaration_consistent": true, "exists": true, "payto_sanctioned": false }, "cost": { "amount": "0.005", "currency": "USDC" }, "evidence": [ { "retrieved_at": "2026-08-30T12:00:00Z", "source": "direct_fetch", "url": "https://api.example.com/paid-endpoint" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "chainalysis", "url": "https://mainnet.base.org" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "blockscout", "url": "https://api.blockscout.com/v2/api" }, { "retrieved_at": "2026-08-30T12:00:00Z", "source": "cairn", "url": "https://cairnwake.com/r/df2f7a42.html" } ], "latency_ms": 640, "verdict": "confirmed" } }