{ "id": "keyed-changefeed-materialize", "name": "Atomic keyed changefeed snapshot materializer", "description": "Fold supplied ordered revision-checked put/delete events into a fresh complete keyed snapshot with tombstones and receipts, or return the first tentative-fold conflict without partial state. Valid conflicts are normal paid results; never reads or writes a database.", "category": "data-assurance", "priceUsd": "0.006", "pricingStatus": "proposed-unverified", "pricing": { "unit": "one successful operation call", "proposedNominalUsd": "0.006", "sixDecimalTokenBaseUnits": "6000", "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": [ "materialize revision checked keyed event batch", "build next offline snapshot with tombstones", "locate first atomic changefeed conflict" ], "whenToUse": [ "Preparing a complete next snapshot from caller-supplied records and events", "Keeping exact typed tuple identity and explicit revision arithmetic", "Inspecting an offline ordered event fold before separately authorized persistence" ], "whenNotToUse": [ "Live CDC ingestion, database CAS or transactions, cursor advancement or durable writes", "Historical event deduplication, exactly-once execution or authenticated event provenance", "Partial record patches, last-writer-wins, tombstone garbage collection or CRDT convergence", "Fetching sources, changing external state or executing supplied data" ], "capabilities": [ "Atomic complete snapshot or first-conflict diagnostic with no partial receipts", "Tombstones and explicit recreation preserve snapshot insertion order", "Conflict precedence is revision mismatch, delete not live, then revision exhaustion", "Valid materialized and conflict outcomes each incur the proposed per-result price", "Deterministic supplied-input-only inert artifact; no network, clock, randomness or external state change" ], "related": [ "json-patch", "idempotency-conflict-check", "replay-divergence-check", "message-batch-plan" ], "limits": { "inputBytes": 100000, "outputBytes": 300000, "jsonNodes": 10000, "depth": 20, "profile": "explicit-key-revision-fold-v1", "snapshotEntries": 512, "events": 256, "finalKeys": 768, "keyComponentsPerTuple": 4, "keyComponentVisits": 3072, "identifierUtf8Bytes": 128, "aggregateKeyTupleUtf8Bytes": 64000, "revisionMaximum": "999999999999999999999999", "foldSteps": 256 }, "errorCodes": [ "INPUT_LIMIT", "OUTPUT_LIMIT", "COMPLEXITY_LIMIT", "INVALID_JSON", "INVALID_NUMBER", "INVALID_UNICODE", "UNSAFE_KEY", "INVALID_INPUT", "MATERIALIZER_DUPLICATE_KEY", "MATERIALIZER_EVENT_ID", "MATERIALIZER_KEY_LIMIT", "STATE_WORK_LIMIT" ], "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": "keyed-changefeed-materialize", "operation.category": "data-assurance", "limit.httpRequestBytes": 131072, "limit.requestBytes": 100000, "limit.responseBytes": 524288, "limit.resultBytes": 300000, "limit.jsonDepth": 20, "limit.jsonNodes": 10000, "materializer.profile": "explicit-key-revision-fold-v1", "materializer.keyIdentity": "typed-scalar-tuples", "materializer.revisionModel": "canonical-unsigned-decimal-strings", "materializer.revisionMaximum": "999999999999999999999999", "materializer.eventOrder": "supplied-array-order", "materializer.atomicResult": true, "materializer.conflictObservationScope": "tentative-input-fold", "materializer.nullIsTombstone": true, "materializer.maxSnapshotEntries": 512, "materializer.maxEvents": 256, "materializer.maxFinalKeys": 768, "materializer.maxKeyComponents": 4, "materializer.maxAggregateKeyTupleBytes": 64000, "materializer.validConflictsArePaidResults": true, "materializer.databaseTransaction": false, "materializer.persistentState": false, "materializer.cursorAdvancement": false, "materializer.historicalEventDeduplication": false, "materializer.exactlyOnceGuarantee": false, "materializer.eventAuthenticity": false, "materializer.partialFieldPatches": false, "materializer.crdtConvergence": false, "input.snapshot.maxItems": 512, "input.events.maxItems": 256 }, "unknownPolicy": "Undeclared requirements are unknown, never compatible. Matching declared facts does not establish semantic fit or input validity.", "preflight": "/preflight" }, "documentation": "/reference/tools/keyed-changefeed-materialize.md", "serviceContract": "/reference/services/keyed-changefeed-materialize.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/keyed-changefeed-materialize", "mpp": "/v1/mpp/keyed-changefeed-materialize" }, "inputSchema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "type": "object", "properties": { "snapshot": { "maxItems": 512, "type": "array", "items": { "type": "object", "properties": { "key": { "minItems": 1, "maxItems": 4, "type": "array", "items": { "anyOf": [ { "type": "string", "minLength": 1, "maxLength": 128 }, { "type": "boolean" }, { "type": "integer", "minimum": -9007199254740991, "maximum": 9007199254740991 } ] } }, "revision": { "type": "string", "maxLength": 24, "pattern": "^[1-9]\\d{0,23}$" }, "value": { "anyOf": [ { "type": "object", "propertyNames": { "type": "string" }, "additionalProperties": {} }, { "type": "null" } ] } }, "required": [ "key", "revision", "value" ], "additionalProperties": false } }, "events": { "maxItems": 256, "type": "array", "items": { "oneOf": [ { "type": "object", "properties": { "id": { "type": "string", "minLength": 1, "maxLength": 128 }, "key": { "minItems": 1, "maxItems": 4, "type": "array", "items": { "anyOf": [ { "type": "string", "minLength": 1, "maxLength": 128 }, { "type": "boolean" }, { "type": "integer", "minimum": -9007199254740991, "maximum": 9007199254740991 } ] } }, "expectedRevision": { "type": "string", "maxLength": 24, "pattern": "^(?:0|[1-9]\\d{0,23})$" }, "op": { "type": "string", "const": "put" }, "value": { "type": "object", "propertyNames": { "type": "string" }, "additionalProperties": {} } }, "required": [ "id", "key", "expectedRevision", "op", "value" ], "additionalProperties": false }, { "type": "object", "properties": { "id": { "type": "string", "minLength": 1, "maxLength": 128 }, "key": { "minItems": 1, "maxItems": 4, "type": "array", "items": { "anyOf": [ { "type": "string", "minLength": 1, "maxLength": 128 }, { "type": "boolean" }, { "type": "integer", "minimum": -9007199254740991, "maximum": 9007199254740991 } ] } }, "expectedRevision": { "type": "string", "maxLength": 24, "pattern": "^(?:0|[1-9]\\d{0,23})$" }, "op": { "type": "string", "const": "delete" } }, "required": [ "id", "key", "expectedRevision", "op" ], "additionalProperties": false } ] } } }, "required": [ "snapshot", "events" ], "additionalProperties": false }, "outputSchema": { "type": "object", "required": [ "operation", "version", "result", "provenance" ], "properties": { "operation": { "const": "keyed-changefeed-materialize", "type": "string" }, "version": { "const": "0.29.0", "type": "string" }, "result": { "$schema": "https://json-schema.org/draft/2020-12/schema", "oneOf": [ { "type": "object", "properties": { "profile": { "type": "string", "const": "explicit-key-revision-fold-v1" }, "status": { "type": "string", "const": "materialized" }, "snapshot": { "maxItems": 768, "type": "array", "items": { "type": "object", "properties": { "key": { "minItems": 1, "maxItems": 4, "type": "array", "items": { "anyOf": [ { "type": "string", "minLength": 1, "maxLength": 128 }, { "type": "boolean" }, { "type": "integer", "minimum": -9007199254740991, "maximum": 9007199254740991 } ] } }, "revision": { "type": "string", "maxLength": 24, "pattern": "^[1-9]\\d{0,23}$" }, "value": { "anyOf": [ { "type": "object", "propertyNames": { "type": "string" }, "additionalProperties": {} }, { "type": "null" } ] } }, "required": [ "key", "revision", "value" ], "additionalProperties": false } }, "receipts": { "maxItems": 256, "type": "array", "items": { "type": "object", "properties": { "eventIndex": { "type": "integer", "minimum": 0, "maximum": 255 }, "eventId": { "type": "string", "minLength": 1, "maxLength": 128 }, "key": { "minItems": 1, "maxItems": 4, "type": "array", "items": { "anyOf": [ { "type": "string", "minLength": 1, "maxLength": 128 }, { "type": "boolean" }, { "type": "integer", "minimum": -9007199254740991, "maximum": 9007199254740991 } ] } }, "previousRevision": { "type": "string", "maxLength": 24, "pattern": "^(?:0|[1-9]\\d{0,23})$" }, "revision": { "type": "string", "maxLength": 24, "pattern": "^[1-9]\\d{0,23}$" }, "op": { "type": "string", "enum": [ "put", "delete" ] } }, "required": [ "eventIndex", "eventId", "key", "previousRevision", "revision", "op" ], "additionalProperties": false } }, "conflict": { "type": "null" } }, "required": [ "profile", "status", "snapshot", "receipts", "conflict" ], "additionalProperties": false }, { "type": "object", "properties": { "profile": { "type": "string", "const": "explicit-key-revision-fold-v1" }, "status": { "type": "string", "const": "conflict" }, "snapshot": { "type": "null" }, "receipts": { "maxItems": 0, "type": "array", "items": { "type": "object", "properties": { "eventIndex": { "type": "integer", "minimum": 0, "maximum": 255 }, "eventId": { "type": "string", "minLength": 1, "maxLength": 128 }, "key": { "minItems": 1, "maxItems": 4, "type": "array", "items": { "anyOf": [ { "type": "string", "minLength": 1, "maxLength": 128 }, { "type": "boolean" }, { "type": "integer", "minimum": -9007199254740991, "maximum": 9007199254740991 } ] } }, "previousRevision": { "type": "string", "maxLength": 24, "pattern": "^(?:0|[1-9]\\d{0,23})$" }, "revision": { "type": "string", "maxLength": 24, "pattern": "^[1-9]\\d{0,23}$" }, "op": { "type": "string", "enum": [ "put", "delete" ] } }, "required": [ "eventIndex", "eventId", "key", "previousRevision", "revision", "op" ], "additionalProperties": false } }, "conflict": { "type": "object", "properties": { "eventIndex": { "type": "integer", "minimum": 0, "maximum": 255 }, "eventId": { "type": "string", "minLength": 1, "maxLength": 128 }, "key": { "minItems": 1, "maxItems": 4, "type": "array", "items": { "anyOf": [ { "type": "string", "minLength": 1, "maxLength": 128 }, { "type": "boolean" }, { "type": "integer", "minimum": -9007199254740991, "maximum": 9007199254740991 } ] } }, "code": { "type": "string", "enum": [ "REVISION_MISMATCH", "DELETE_NOT_LIVE", "REVISION_EXHAUSTED" ] }, "expectedRevision": { "type": "string", "maxLength": 24, "pattern": "^(?:0|[1-9]\\d{0,23})$" }, "observedRevision": { "type": "string", "maxLength": 24, "pattern": "^(?:0|[1-9]\\d{0,23})$" }, "observedState": { "type": "string", "enum": [ "absent", "live", "tombstone" ] }, "tentativePrefixLength": { "type": "integer", "minimum": 0, "maximum": 255 }, "observationScope": { "type": "string", "const": "tentative-input-fold" } }, "required": [ "eventIndex", "eventId", "key", "code", "expectedRevision", "observedRevision", "observedState", "tentativePrefixLength", "observationScope" ], "additionalProperties": false } }, "required": [ "profile", "status", "snapshot", "receipts", "conflict" ], "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": { "snapshot": [ { "key": [ "a" ], "revision": "1", "value": { "qty": 2 } } ], "events": [ { "id": "p1", "key": [ "a" ], "expectedRevision": "1", "op": "put", "value": { "qty": 3 } }, { "id": "d1", "key": [ "a" ], "expectedRevision": "2", "op": "delete" }, { "id": "p2", "key": [ "b" ], "expectedRevision": "0", "op": "put", "value": { "qty": 4 } } ] }, "exampleResponse": { "operation": "keyed-changefeed-materialize", "version": "0.29.0", "result": { "profile": "explicit-key-revision-fold-v1", "status": "materialized", "snapshot": [ { "key": [ "a" ], "revision": "3", "value": null }, { "key": [ "b" ], "revision": "1", "value": { "qty": 4 } } ], "receipts": [ { "eventIndex": 0, "eventId": "p1", "key": [ "a" ], "previousRevision": "1", "revision": "2", "op": "put" }, { "eventIndex": 1, "eventId": "d1", "key": [ "a" ], "previousRevision": "2", "revision": "3", "op": "delete" }, { "eventIndex": 2, "eventId": "p2", "key": [ "b" ], "previousRevision": "0", "revision": "1", "op": "put" } ], "conflict": null }, "provenance": { "inputSha256": "0806420b48aaad2e7df90f6c368d04a2f588e308b57e6536133b1b3593c84b21", "outputSha256": "8e3b4cfcf12793cfa950f05dde67e059ad2da1b5ec7be8f17024463b28337204", "deterministic": true, "externalRequests": 0 } }, "requiredHeaders": { "Content-Type": "application/json", "Idempotency-Key": "random 16–128 character operation identifier" }, "fixedExample": "/reference/examples/keyed-changefeed-materialize.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." } }