{"uid":"cap_1JAAe9LhQ3aqWZIhXnBce","slug":"annalist-x402-seller-reputation-check-b4a3b9d3","name":"Annalist x402 Seller Reputation Check","description":"Signed data for AI agents, paid per call over x402. Hyperliquid crowd state, smart money and liquidations with what historically happened next, plus independent checks of x402 services and MCP servers.","url":"https://api.annalist.dev/v1/checks/seller?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"data":{"usage":{"payments_30d":900},"address":"0xde48...","services":[{"host":"api.example.com","grade":"B"}]}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2jkD1U0_W0ZQRxC7Ky-wk","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns reputation, payment history, and service grades for an x402 seller address, helping agents evaluate trustworthiness of x402 API providers","exampleAgentPrompt":"Before I start paying this x402 seller at 0xde48...abcd, can you check their Annalist reputation — how many payments they've processed in the last 30 days and what grade their services have?","exampleUseCases":[{"title":"Vetting an unknown x402 API seller","prompt":"I found an x402 API I want to use but I've never heard of the provider — can you check the seller address 0xAb12...3456 on Annalist to see their payment history and service grades before I start calling it?"},{"title":"Comparing two x402 providers","prompt":"I'm choosing between two x402 sellers — address 0x1111...aaaa and 0x2222...bbbb. Can you look up both on Annalist and tell me which one has more payments in the last 30 days and better service grades?"},{"title":"Auditing a suspicious x402 charge","prompt":"I just got billed by an x402 service at address 0xDead...Beef and something feels off — can you pull their Annalist seller profile so I can see their track record and whether their services have any low grades?"}],"resultDescription":"Returns a JSON object with the seller's Ethereum address, 30-day payment count, and a list of services hosted under that seller with per-host letter grades (e.g. A, B, C) reflecting service quality and reliability checks.","failureModes":["Invalid or malformed Ethereum address returns a 400 or validation error","Unknown address with no recorded activity returns empty services array and zero payment count","Network or upstream data unavailability may return a 503 or timeout","Payment failure via x402 protocol prevents access to results"],"whenToPreferThis":"Use this endpoint when an AI agent needs to independently verify the trustworthiness of an x402 API seller before committing to paid calls. It is uniquely suited for pre-flight checks in agentic workflows that autonomously spend USDC via x402, where integrating an unvetted seller could waste funds or expose the agent to unreliable services. Prefer this over general blockchain explorers because it aggregates payment volume and service-level grades specific to the x402 ecosystem.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-14T06:35:04.167Z","isFirstParty":false,"canonicalSlug":"annalist-x402-seller-reputation-check-b4a3b9d3"}