{"uid":"cap_ELNlD-R5jQSIb9_PgKSp6","slug":"factstamp-c8206315","name":"FactStamp","description":"Figure, entity, citation and dependency verification for other agents. Cited to dated primary sources. Unknown is valid.","url":"https://factstamp.agentrails.workers.dev/mcp?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input","output"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"body":{"type":"object"},"type":{"const":"http"},"method":{"const":"POST"},"bodyType":{"const":"application/json"}},"additionalProperties":true},"output":{"type":"object","required":["type","example"],"properties":{"type":{"const":"json"},"example":{"type":"object"}},"additionalProperties":true}},"additionalProperties":false},"responseSchema":{"type":"json","example":{"best":{"id":"549300HGQ43STJLLP808","name":"SHOPIFY INC.","source":"gleif","jurisdiction":"CA-ON","registration_status":"ISSUED"},"query":"Shopify Inc.","sources":[{"source":"gleif","licence":"CC0 1.0 Universal","http_status":200}],"verdict":"found","accepted":1}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_yO8bnHMrwkbgxQoMo3TiO","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies figures, named entities, citations, and dependencies against dated primary sources, returning a sourced verdict for AI agent fact-checking pipelines.","exampleAgentPrompt":"Can you verify that 'Shopify Inc.' is a real registered company and tell me its official jurisdiction and registration status, with a citation to the primary source?","exampleUseCases":[{"title":"AI report citation audit","prompt":"I have a research report generated by another agent — can you verify that 'Shopify Inc.' is correctly named and registered, and flag it with a dated primary-source citation so I know the claim is solid?"},{"title":"Legal entity due diligence","prompt":"Before we sign this contract, can you confirm that 'Klarna Bank AB' is a legitimately registered entity, what jurisdiction it's in, and whether its registration status is currently active?"},{"title":"Unknown entity triage in agent pipeline","prompt":"Our pipeline encountered the entity 'Acme Holdings Ltd' — can you check if it's verifiable against any primary source registry, and return 'unknown' if it can't be confirmed so we can flag it for human review?"}],"resultDescription":"Returns a JSON object with a verdict field ('found' or 'unknown'), the canonical entity name, a best-match record including LEI ID, jurisdiction, and registration status, the original query string, and an array of sources with licence info and HTTP status codes from the primary-source registries consulted.","failureModes":["Entity not found in any registry — returns verdict 'unknown', which is a valid and intentional outcome","Ambiguous entity name matches multiple records — best match returned but confidence may be low","Registry source temporarily unavailable — HTTP status codes in sources array will reflect errors","Malformed input body — 400-level error returned","Payment not completed via x402 protocol — 402 Payment Required before verification proceeds"],"whenToPreferThis":"Choose FactStamp when you need verified, cited facts about named entities or figures backed by dated primary sources rather than LLM-generated plausible answers. Especially valuable in multi-agent pipelines where one agent's output needs independent verification before being used downstream. Prefer it over web search when authoritative registry-level confirmation (e.g. GLEIF LEI data) is required, or when 'unknown' is an acceptable and important outcome that must be explicitly flagged.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T00:40:02.967Z","isFirstParty":false,"canonicalSlug":"factstamp-c8206315"}