{ "id": "corpus-bm25-search", "name": "Search a supplied text corpus", "description": "Rank supplied documents with fixed-parameter lexical BM25 and exact original UTF-16 token spans. Scores are binary64 logarithm approximations ordered at 12 decimal places, with exact ID ties. No embeddings, persistent index, web search or semantic relevance guarantee.", "category": "text", "priceUsd": "0.005", "pricingStatus": "proposed-unverified", "pricing": { "unit": "one successful operation call", "proposedNominalUsd": "0.005", "sixDecimalTokenBaseUnits": "5000", "subscription": false, "includesPayerWalletOrNetworkFees": false, "liveQuoteVerified": false, "condition": "Actual SDK challenge is authoritative only within the caller's explicit authorization; configured six-decimal token peg is an operator assertion, not a conversion guarantee." }, "intents": [ "Rank my supplied documents by lexical BM25", "Retrieve matching passages from caller-supplied text with exact token offsets" ], "whenToUse": [ "Rank my supplied documents by lexical BM25", "Retrieve matching passages from caller-supplied text with exact token offsets" ], "whenNotToUse": [ "Web search, semantic/vector search, linguistic segmentation, relevance certification or verifying whether a passage supports a claim", "Network calls, external actions, supplied-evidence authenticity or factual correctness certification" ], "capabilities": [ "128 supplied documents and 16 queries; k1=1.2, b=0.75; distinct sorted query terms", "Unicode Letter/Number followed by Letter/Mark/Number runs, locale-independent lowercase, no normalization", "12-decimal approximate scores, exact ID tie-breaks, omitted-candidate and omitted-span evidence", "Networkless bounded computation; advisoryOnly=true; externalRequests=0" ], "limits": { "inputBytes": 100000, "outputBytes": 400000, "jsonNodes": 12000, "depth": 20, "documents": 128, "queries": 16, "corpusBytes": 60000, "documentBytes": 20000, "corpusTokens": 12000, "corpusTerms": 4096, "queryTerms": 64, "queryCodePoints": 512, "tokenCodePoints": 128, "topK": 20, "hitSpans": 20, "contributionChecks": 131072 }, "errorCodes": [ "INPUT_LIMIT", "OUTPUT_LIMIT", "COMPLEXITY_LIMIT", "INVALID_NUMBER", "INVALID_UNICODE", "UNSAFE_KEY", "DUPLICATE_ID", "TEXT_LIMIT", "TOKEN_LIMIT", "TERM_LIMIT", "TOKEN_LENGTH_LIMIT" ], "related": [ "text-chunk", "ranking-evaluate", "context-budget-pack" ], "requirementsProfile": { "format": "declared-requirements-v1", "facts": { "execution.suppliedCode": false, "execution.remoteMutation": false, "execution.llmInference": false, "execution.paidMcp": false, "verification.semanticTruth": false, "verification.sourceAuthenticity": false, "verification.liveVulnerabilities": false, "numbers.arbitraryPrecisionJson": false, "numbers.model": "ieee754-binary64", "privacy.requestBodyPersisted": false, "execution.deterministic": true, "execution.networkAccess": false, "privacy.resultBodyPersisted": false, "payment.x402": true, "payment.mpp": true, "operation.id": "corpus-bm25-search", "operation.category": "text", "limit.httpRequestBytes": 131072, "limit.requestBytes": 100000, "limit.responseBytes": 524288, "limit.resultBytes": 400000, "limit.jsonDepth": 20, "limit.jsonNodes": 12000, "corpusSearch.profile": "supplied-unicode-word-bm25-v1", "corpusSearch.maxDocuments": 128, "corpusSearch.maxQueries": 16, "corpusSearch.maxCorpusBytes": 60000, "corpusSearch.maxDocumentBytes": 20000, "corpusSearch.maxTokens": 12000, "corpusSearch.maxCorpusTerms": 4096, "corpusSearch.maxQueryTerms": 64, "corpusSearch.maxQueryCodePoints": 512, "corpusSearch.maxTokenCodePoints": 128, "corpusSearch.maxHitSpans": 20, "corpusSearch.maxTopK": 20, "corpusSearch.offsets": "utf16-half-open", "corpusSearch.scoreArithmetic": "binary64-rounded-to-12-decimal-places", "corpusSearch.semanticRelevanceVerified": false, "corpusSearch.embeddings": false, "corpusSearch.networkRetrieval": false, "corpusSearch.persistentIndex": false, "corpusSearch.fullLinguisticSegmentation": false, "input.documents.maxItems": 128, "input.documents.minItems": 1, "input.queries.maxItems": 16, "input.queries.minItems": 1 }, "unknownPolicy": "Undeclared requirements are unknown, never compatible. Matching declared facts does not establish semantic fit or input validity.", "preflight": "/preflight" }, "documentation": "/reference/tools/corpus-bm25-search.md", "serviceContract": "/reference/services/corpus-bm25-search.json", "errors": [ { "status": 400, "meaning": "Malformed JSON, missing/invalid idempotency key, or payment identifier mismatch", "retry": "Correct the request before payment" }, { "status": 402, "meaning": "Payment challenge or rejected payment", "retry": "Use official protocol SDK; inspect payment outcome before another payment" }, { "status": 409, "meaning": "Idempotency conflict, duplicate proof, or PAYMENT_UNCERTAIN", "retry": "Keep original key, body, and proof; reconcile uncertainty with operator; never blindly repay" }, { "status": 413, "meaning": "Input or generated output too large", "retry": "Reduce input; no payment attempted for validation failure" }, { "status": 415, "meaning": "Unsupported media type or compression", "retry": "Send uncompressed application/json" }, { "status": 422, "meaning": "Schema or service-specific semantic validation failure", "retry": "Correct input using returned error code; no payment attempted" }, { "status": 429, "meaning": "Request/payment-attempt rate exceeded", "retry": "Wait for rate limit window; preserve existing payment identity" }, { "status": 503, "meaning": "Payment configuration/provider/state unavailable, or live DNS preparation failed before settlement", "retry": "Check readiness; DNS preparation failures may retry the identical key/body/credential only; uncertainty requires reconciliation" } ], "numericPrecision": "JavaScript IEEE-754 numbers; use strings for large integer IDs/exact decimals where the schema accepts strings. No lossless numeric parsing.", "paymentWorkflow": { "discoveryOnly": false, "supportedProtocols": [ "x402", "mpp" ], "x402": { "credentialHeader": "PAYMENT-SIGNATURE", "challengeHeader": "PAYMENT-REQUIRED", "receiptHeader": "PAYMENT-RESPONSE", "version": 2, "scheme": "exact", "paymentIdentifier": "payment-identifier extension MUST equal the HTTP Idempotency-Key", "sdk": "@x402/core with @x402/evm" }, "mpp": { "supported": true, "credentialHeader": "Authorization", "challengeHeader": "WWW-Authenticate", "receiptHeader": "Payment-Receipt", "method": "tempo", "intent": "charge", "sdk": "mppx", "tokenDecimals": 6 }, "steps": [ "Check configured readiness and the exact service schema", "Generate a fresh random Idempotency-Key for this operation; never use a discovery probe fixture for purchases", "Send valid input without a credential to obtain the official protocol challenge", "Use the official SDK and authorized wallet to fulfill the challenge", "Retry only with identical key, body, protocol and credential", "On PAYMENT_UNCERTAIN stop and request operator reconciliation; never blindly pay again" ], "versionedRetries": "Request fingerprint includes service release version. Retries across a version upgrade can conflict; coordinate upgrades outside the 24-hour replay window and reconcile pending attempts.", "docs": "/llms.txt" }, "method": "POST", "paths": { "x402": "/v1/x402/corpus-bm25-search", "mpp": "/v1/mpp/corpus-bm25-search" }, "inputSchema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "type": "object", "properties": { "documents": { "minItems": 1, "maxItems": 128, "type": "array", "items": { "type": "object", "properties": { "id": { "type": "string", "minLength": 1, "maxLength": 100 }, "text": { "type": "string", "maxLength": 20000 } }, "required": [ "id", "text" ], "additionalProperties": false } }, "queries": { "minItems": 1, "maxItems": 16, "type": "array", "items": { "type": "object", "properties": { "id": { "type": "string", "minLength": 1, "maxLength": 100 }, "text": { "type": "string", "maxLength": 1024 }, "topK": { "type": "integer", "minimum": 1, "maximum": 20 } }, "required": [ "id", "text", "topK" ], "additionalProperties": false } } }, "required": [ "documents", "queries" ], "additionalProperties": false }, "outputSchema": { "type": "object", "required": [ "operation", "version", "result", "provenance" ], "properties": { "operation": { "const": "corpus-bm25-search", "type": "string" }, "version": { "const": "0.29.0", "type": "string" }, "result": { "$schema": "https://json-schema.org/draft/2020-12/schema", "type": "object", "properties": { "advisoryOnly": { "type": "boolean", "const": true }, "externalRequests": { "type": "number", "const": 0 }, "profile": { "type": "string", "const": "supplied-unicode-word-bm25-v1" }, "documentCount": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 }, "tokenCount": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 }, "queries": { "maxItems": 16, "type": "array", "items": { "type": "object", "properties": { "id": { "type": "string", "minLength": 1, "maxLength": 100 }, "status": { "type": "string", "enum": [ "ranked", "empty-query" ] }, "terms": { "maxItems": 64, "type": "array", "items": { "type": "string", "maxLength": 512 } }, "candidateCount": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 }, "omittedCandidates": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 }, "hits": { "maxItems": 20, "type": "array", "items": { "type": "object", "properties": { "id": { "type": "string", "minLength": 1, "maxLength": 100 }, "sourceIndex": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 }, "score": { "type": "string", "pattern": "^\\d+\\.\\d{12}$" }, "matchedTerms": { "maxItems": 64, "type": "array", "items": { "type": "string", "maxLength": 512 } }, "spans": { "maxItems": 20, "type": "array", "items": { "type": "object", "properties": { "term": { "type": "string", "maxLength": 512 }, "start": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 }, "end": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 } }, "required": [ "term", "start", "end" ], "additionalProperties": false } }, "omittedSpans": { "type": "integer", "minimum": 0, "maximum": 9007199254740991 } }, "required": [ "id", "sourceIndex", "score", "matchedTerms", "spans", "omittedSpans" ], "additionalProperties": false } } }, "required": [ "id", "status", "terms", "candidateCount", "omittedCandidates", "hits" ], "additionalProperties": false } }, "semanticRelevanceVerified": { "type": "boolean", "const": false }, "scoreArithmetic": { "type": "string", "const": "binary64-logarithm-approximation" }, "scoreOrdering": { "type": "string", "const": "fixed-12-decimal-score-descending-then-UTF16-id" }, "offsetUnits": { "type": "string", "const": "UTF-16 code units; zero-based, end-exclusive" } }, "required": [ "advisoryOnly", "externalRequests", "profile", "documentCount", "tokenCount", "queries", "semanticRelevanceVerified", "scoreArithmetic", "scoreOrdering", "offsetUnits" ], "additionalProperties": false }, "provenance": { "type": "object", "required": [ "inputSha256", "outputSha256", "deterministic", "externalRequests" ], "properties": { "inputSha256": { "type": "string", "pattern": "^[a-f0-9]{64}$" }, "outputSha256": { "type": "string", "pattern": "^[a-f0-9]{64}$" }, "deterministic": { "const": true }, "externalRequests": { "const": 0 } } } }, "additionalProperties": false }, "exampleInput": { "documents": [ { "id": "d1", "text": "red fox" }, { "id": "d2", "text": "blue dog" } ], "queries": [ { "id": "q1", "text": "red", "topK": 2 } ] }, "exampleResponse": { "operation": "corpus-bm25-search", "version": "0.29.0", "result": { "advisoryOnly": true, "externalRequests": 0, "profile": "supplied-unicode-word-bm25-v1", "documentCount": 2, "tokenCount": 4, "queries": [ { "id": "q1", "status": "ranked", "terms": [ "red" ], "candidateCount": 1, "omittedCandidates": 0, "hits": [ { "id": "d1", "sourceIndex": 0, "score": "0.693147180560", "matchedTerms": [ "red" ], "spans": [ { "term": "red", "start": 0, "end": 3 } ], "omittedSpans": 0 } ] } ], "semanticRelevanceVerified": false, "scoreArithmetic": "binary64-logarithm-approximation", "scoreOrdering": "fixed-12-decimal-score-descending-then-UTF16-id", "offsetUnits": "UTF-16 code units; zero-based, end-exclusive" }, "provenance": { "inputSha256": "b0875c7142d0bbaaced040f155f697415bc61a604d6f69e4dda2ab57deae1de9", "outputSha256": "39eac80fbdd9d2318a7ab087a0a3fe92145f6ddb0ebfa26619059e4e5ffaa7d2", "deterministic": true, "externalRequests": 0 } }, "requiredHeaders": { "Content-Type": "application/json", "Idempotency-Key": "random 16–128 character operation identifier" }, "fixedExample": "/reference/examples/corpus-bm25-search.json", "execution": { "deterministic": true, "externalRequests": 0, "maxExternalRequests": 0, "resultSnapshotPersisted": false, "fixedExampleIsIllustrativeSnapshot": false, "requiresPayment": true, "supportsMcpExecution": false }, "releaseSnapshot": { "format": "static-release-reference-v1", "sourceVersion": "0.29.0", "sourceRegistrySha256": "a2b5ec09bf6c38b9d2879d746a4fded374f5928b445377b0270ef6aa8e6cac65", "generatedAt": "2026-10-06T15:38:00Z", "releaseAcceptance": "not-verified-by-generator", "runtimeReadiness": "not-evaluated", "livePaymentsVerified": false, "indexingVerified": false, "apiOrigin": null, "notice": "Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment." } }