{"id":"evidence-bundle-check","title":"Check that every claim in an evidence bundle has enough independent, fresh, quote-verified support","description":"Checks a bundle an agent assembled before answering: each claim must be backed by at least N evidence items from distinct source groups, each item's quote must actually appear in the supplied text (with offsets), publication dates must be within the caller's maximum age relative to a caller-supplied asOf, and duplicates are collapsed. Does not fetch URLs or judge whether a source is reliable or whether the quote supports the claim; source groups come from the caller or an approximate host reduction.","roi":"Catches unsupported or single-source claims before they are asserted. 100 claims and 300 evidence items per $0.005 call.","audience":"agent-infra","package":"context-evidence-kit","channels":["x402","mcp"],"endpoint":{"method":"POST","url":"https://agents.writerslogic.com/api/v1/evidence-bundle-check","path":"/api/v1/evidence-bundle-check","contentType":"application/json"},"price":{"amount":"0.005","currency":"USDC","network":"base","perCall":true,"failedCallsCharged":false},"inputSchema":{"type":"object","additionalProperties":false,"required":["claims","evidence"],"properties":{"claims":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string","maxLength":100,"minLength":1,"description":"Unique id."},"text":{"type":"string","maxLength":2000},"minEvidence":{"type":"integer","minimum":1,"maximum":20,"description":"Distinct source groups needed. Default 1."}},"required":["id"]},"maxItems":100,"minItems":1,"description":"Claims to support."},"evidence":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string","maxLength":100,"minLength":1,"description":"Unique id."},"claimIds":{"type":"array","items":{"type":"string","maxLength":100},"maxItems":50,"description":"Claims this item is offered for."},"url":{"type":"string","maxLength":2000},"sourceGroup":{"type":"string","maxLength":200,"description":"Independent-source key (publisher/owner). Overrides the host reduction."},"publishedAt":{"type":"string","maxLength":40,"description":"ISO 8601 date or date-time."},"text":{"type":"string","maxLength":50000,"description":"Source text the quote should appear in."},"quote":{"type":"string","maxLength":2000,"description":"Verbatim excerpt claimed from text."}},"required":["id","claimIds"]},"maxItems":300,"description":"Up to 300 items; 300000 characters of text in total."},"asOf":{"type":"string","maxLength":40,"description":"Reference instant (ISO 8601) for age checks; required with maxAgeDays. The check never reads the clock."},"maxAgeDays":{"type":"integer","minimum":0,"maximum":36500,"description":"Evidence published longer ago than this (relative to asOf) is stale."},"requireQuotes":{"type":"boolean","description":"Evidence without a verifiable quote does not count as support. Default true."}}},"resultSchema":{"type":"object","properties":{"status":{"type":"string","enum":["pass","fail","unknown","unsupported"],"description":"pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass."},"claims":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string"},"verdict":{"type":"string","enum":["supported","unsupported","unverified"]},"independentSources":{"type":"integer"},"needed":{"type":"integer"},"evidenceIds":{"type":"array","items":{"type":"string","maxLength":100},"maxItems":300}}},"maxItems":100},"evidence":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string"},"state":{"type":"string","enum":["verified","unverifiable","quote-not-found","stale","undated","duplicate"]},"group":{"type":"string"},"quoteSpan":{"type":"object","description":"Half-open [start,end) range in four coordinate systems: UTF-16 code units, code points, UTF-8 bytes, extended grapheme clusters (Intl.Segmenter).","properties":{"utf16":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"codePoint":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"utf8":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"grapheme":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"graphemeAligned":{"type":"boolean"}}}}},"maxItems":300},"witnesses":{"type":"array","items":{"type":"object","properties":{"ruleId":{"type":"string"},"detail":{"type":"string"},"path":{"type":"string","description":"JSON pointer or dotted path into the input."},"offset":{"type":"integer"},"index":{"type":"integer"},"expected":{"description":"What the rule required."},"actual":{"description":"What the input had."}}}},"versions":{"type":"object","description":"Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile)."},"limits":{"type":"array","items":{"type":"string"}},"deterministic":{"type":"boolean","description":"Always true: pure code, no model."}}},"outputSchema":{"type":"object","properties":{"data":{"type":"object","properties":{"status":{"type":"string","enum":["pass","fail","unknown","unsupported"],"description":"pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass."},"claims":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string"},"verdict":{"type":"string","enum":["supported","unsupported","unverified"]},"independentSources":{"type":"integer"},"needed":{"type":"integer"},"evidenceIds":{"type":"array","items":{"type":"string","maxLength":100},"maxItems":300}}},"maxItems":100},"evidence":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string"},"state":{"type":"string","enum":["verified","unverifiable","quote-not-found","stale","undated","duplicate"]},"group":{"type":"string"},"quoteSpan":{"type":"object","description":"Half-open [start,end) range in four coordinate systems: UTF-16 code units, code points, UTF-8 bytes, extended grapheme clusters (Intl.Segmenter).","properties":{"utf16":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"codePoint":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"utf8":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"grapheme":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"graphemeAligned":{"type":"boolean"}}}}},"maxItems":300},"witnesses":{"type":"array","items":{"type":"object","properties":{"ruleId":{"type":"string"},"detail":{"type":"string"},"path":{"type":"string","description":"JSON pointer or dotted path into the input."},"offset":{"type":"integer"},"index":{"type":"integer"},"expected":{"description":"What the rule required."},"actual":{"description":"What the input had."}}}},"versions":{"type":"object","description":"Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile)."},"limits":{"type":"array","items":{"type":"string"}},"deterministic":{"type":"boolean","description":"Always true: pure code, no model."}}},"_provenance":{"type":"object","description":"C2PA-aligned manifest and W3C VC 2.0 (eddsa-jcs-2022) issued by the hub DID; verify at POST /api/v1/verify-provenance"}},"required":["data","_provenance"]},"example":{"claims":[{"id":"c1","text":"Revenue grew 12%.","minEvidence":2}],"evidence":[{"id":"e1","claimIds":["c1"],"url":"https://www.example.com/q3","publishedAt":"2026-10-01","text":"Q3 revenue grew 12% year over year.","quote":"revenue grew 12%"},{"id":"e2","claimIds":["c1"],"url":"https://news.example.org/a","publishedAt":"2026-10-02","text":"Analysts noted that revenue grew 12% in the quarter.","quote":"revenue grew 12%"}],"asOf":"2026-11-04","maxAgeDays":90},"openapiOperation":{"operationId":"evidence_bundle_check","summary":"Check that every claim in an evidence bundle has enough independent, fresh, quote-verified support","description":"Checks a bundle an agent assembled before answering: each claim must be backed by at least N evidence items from distinct source groups, each item's quote must actually appear in the supplied text (with offsets), publication dates must be within the caller's maximum age relative to a caller-supplied asOf, and duplicates are collapsed. Does not fetch URLs or judge whether a source is reliable or whether the quote supports the claim; source groups come from the caller or an approximate host reduction.\n\nPrice: 0.005 USDC on Base (x402).","x-x402-price-usdc":"0.005","x-x402-amount":"5000","x-payment-info":{"protocols":["x402"],"price":{"mode":"fixed","currency":"USD","amount":"0.005"}},"x-audience":"agent-infra","x-sample-url":"https://agents.writerslogic.com/api/v1/samples/evidence-bundle-check","security":[{"x402":[]},{"apiKey":[]}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","additionalProperties":false,"required":["claims","evidence"],"properties":{"claims":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string","maxLength":100,"minLength":1,"description":"Unique id."},"text":{"type":"string","maxLength":2000},"minEvidence":{"type":"integer","minimum":1,"maximum":20,"description":"Distinct source groups needed. Default 1."}},"required":["id"]},"maxItems":100,"minItems":1,"description":"Claims to support."},"evidence":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string","maxLength":100,"minLength":1,"description":"Unique id."},"claimIds":{"type":"array","items":{"type":"string","maxLength":100},"maxItems":50,"description":"Claims this item is offered for."},"url":{"type":"string","maxLength":2000},"sourceGroup":{"type":"string","maxLength":200,"description":"Independent-source key (publisher/owner). Overrides the host reduction."},"publishedAt":{"type":"string","maxLength":40,"description":"ISO 8601 date or date-time."},"text":{"type":"string","maxLength":50000,"description":"Source text the quote should appear in."},"quote":{"type":"string","maxLength":2000,"description":"Verbatim excerpt claimed from text."}},"required":["id","claimIds"]},"maxItems":300,"description":"Up to 300 items; 300000 characters of text in total."},"asOf":{"type":"string","maxLength":40,"description":"Reference instant (ISO 8601) for age checks; required with maxAgeDays. The check never reads the clock."},"maxAgeDays":{"type":"integer","minimum":0,"maximum":36500,"description":"Evidence published longer ago than this (relative to asOf) is stale."},"requireQuotes":{"type":"boolean","description":"Evidence without a verifiable quote does not count as support. Default true."}}},"example":{"claims":[{"id":"c1","text":"Revenue grew 12%.","minEvidence":2}],"evidence":[{"id":"e1","claimIds":["c1"],"url":"https://www.example.com/q3","publishedAt":"2026-10-01","text":"Q3 revenue grew 12% year over year.","quote":"revenue grew 12%"},{"id":"e2","claimIds":["c1"],"url":"https://news.example.org/a","publishedAt":"2026-10-02","text":"Analysts noted that revenue grew 12% in the quarter.","quote":"revenue grew 12%"}],"asOf":"2026-11-04","maxAgeDays":90}}}},"responses":{"200":{"description":"Paid result with provenance","content":{"application/json":{"schema":{"type":"object","properties":{"data":{"type":"object","properties":{"status":{"type":"string","enum":["pass","fail","unknown","unsupported"],"description":"pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass."},"claims":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string"},"verdict":{"type":"string","enum":["supported","unsupported","unverified"]},"independentSources":{"type":"integer"},"needed":{"type":"integer"},"evidenceIds":{"type":"array","items":{"type":"string","maxLength":100},"maxItems":300}}},"maxItems":100},"evidence":{"type":"array","items":{"type":"object","additionalProperties":false,"properties":{"id":{"type":"string"},"state":{"type":"string","enum":["verified","unverifiable","quote-not-found","stale","undated","duplicate"]},"group":{"type":"string"},"quoteSpan":{"type":"object","description":"Half-open [start,end) range in four coordinate systems: UTF-16 code units, code points, UTF-8 bytes, extended grapheme clusters (Intl.Segmenter).","properties":{"utf16":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"codePoint":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"utf8":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"grapheme":{"type":"object","properties":{"start":{"type":"integer"},"end":{"type":"integer"}}},"graphemeAligned":{"type":"boolean"}}}}},"maxItems":300},"witnesses":{"type":"array","items":{"type":"object","properties":{"ruleId":{"type":"string"},"detail":{"type":"string"},"path":{"type":"string","description":"JSON pointer or dotted path into the input."},"offset":{"type":"integer"},"index":{"type":"integer"},"expected":{"description":"What the rule required."},"actual":{"description":"What the input had."}}}},"versions":{"type":"object","description":"Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile)."},"limits":{"type":"array","items":{"type":"string"}},"deterministic":{"type":"boolean","description":"Always true: pure code, no model."}}},"_provenance":{"type":"object","description":"C2PA-aligned manifest and W3C VC 2.0 (eddsa-jcs-2022) issued by the hub DID; verify at POST /api/v1/verify-provenance"}},"required":["data","_provenance"]}}}},"400":{"description":"Invalid request (no payment consumed)","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"string"},"code":{"type":"string"}}}}}},"401":{"description":"Invalid X-API-KEY","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"string"},"code":{"type":"string"}}}}}},"402":{"description":"Payment required or invalid","content":{"application/json":{"schema":{"type":"object","description":"x402 v2 PaymentRequired (also base64 in the PAYMENT-REQUIRED header)","properties":{"x402Version":{"type":"integer"},"error":{"type":"string"},"code":{"type":"string"},"resource":{"type":"object"},"accepts":{"type":"array","items":{"type":"object"}},"extensions":{"type":"object"}}}}}},"502":{"description":"Upstream failure; the payment is released or not settled","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"string"},"code":{"type":"string"}}}}}}}},"links":{"docs":"https://agents.writerslogic.com/docs/evidence-bundle-check/","docsJson":"https://agents.writerslogic.com/docs/evidence-bundle-check.json","sample":"https://agents.writerslogic.com/api/v1/samples/evidence-bundle-check","openapi":"https://agents.writerslogic.com/openapi.json","catalog":"https://agents.writerslogic.com/api/v1/catalog","verifyProvenance":"https://agents.writerslogic.com/api/v1/verify-provenance","index":"https://agents.writerslogic.com/docs/index.json"}}