Observed JSON sample shapes
Build an optional, open observational JSON Schema draft and counted evidence from supplied JSON samples; never infer a real API contract.
structured · Operation ID: json-sample-shape-infer
Choose this operation when
- Review a recursive open schema draft inferred from bounded supplied examples
- Inspect sample counts, optional properties and unobserved empty-array items
Outside this profile
- Establishing a universal API contract or production rejection policy
- Inferring required fields, enums, formats, ranges, cross-field correlations or compatibility
- Generating a tool definition or assuming generalized fixture-generator compatibility
- Network access, filesystem changes, target execution, publishing or deployment
Exact release references
Static JSON contract · Markdown reference · Fixed example response
Complete input schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"samples": {
"minItems": 1,
"maxItems": 64,
"type": "array",
"items": {
"$ref": "#/$defs/__schema0"
}
}
},
"required": [
"samples"
],
"additionalProperties": false,
"$defs": {
"__schema0": {
"anyOf": [
{
"type": "string"
},
{
"type": "number"
},
{
"type": "boolean"
},
{
"type": "null"
},
{
"type": "array",
"items": {
"$ref": "#/$defs/__schema0"
}
},
{
"type": "object",
"propertyNames": {
"type": "string"
},
"additionalProperties": {
"$ref": "#/$defs/__schema0"
}
}
]
}
}
}
Complete output-envelope schema
{
"type": "object",
"required": [
"operation",
"version",
"result",
"provenance"
],
"properties": {
"operation": {
"const": "json-sample-shape-infer",
"type": "string"
},
"version": {
"const": "0.29.0",
"type": "string"
},
"result": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"profile": {
"type": "string",
"const": "observed-json-shapes-v1"
},
"evidence": {
"type": "string",
"const": "observed-structure-only"
},
"contractEstablished": {
"type": "boolean",
"const": false
},
"sampleCount": {
"type": "integer",
"minimum": 1,
"maximum": 64
},
"dialect": {
"type": "string",
"const": "https://json-schema.org/draft/2020-12/schema"
},
"schema": {
"$ref": "#/properties/result/$defs/__schema0"
},
"observations": {
"minItems": 1,
"maxItems": 128,
"type": "array",
"items": {
"type": "object",
"properties": {
"schemaPointer": {
"type": "string",
"maxLength": 4096
},
"occurrences": {
"type": "integer",
"minimum": 0,
"maximum": 5000
},
"typeCounts": {
"maxItems": 6,
"type": "array",
"items": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"null",
"boolean",
"number",
"string",
"array",
"object"
]
},
"count": {
"type": "integer",
"minimum": 1,
"maximum": 5000
}
},
"required": [
"type",
"count"
],
"additionalProperties": false
}
},
"objectOccurrences": {
"type": "integer",
"minimum": 0,
"maximum": 5000
},
"properties": {
"maxItems": 32,
"type": "array",
"items": {
"type": "object",
"properties": {
"name": {
"type": "string",
"maxLength": 96
},
"presentCount": {
"type": "integer",
"minimum": 0,
"maximum": 5000
},
"objectCount": {
"type": "integer",
"minimum": 0,
"maximum": 5000
}
},
"required": [
"name",
"presentCount",
"objectCount"
],
"additionalProperties": false
}
},
"elementOccurrences": {
"type": "integer",
"minimum": 0,
"maximum": 5000
}
},
"required": [
"schemaPointer",
"occurrences",
"typeCounts"
],
"additionalProperties": false
}
}
},
"required": [
"profile",
"evidence",
"contractEstablished",
"sampleCount",
"dialect",
"schema",
"observations"
],
"additionalProperties": false,
"$defs": {
"__schema0": {
"anyOf": [
{
"type": "boolean",
"const": true
},
{
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"null",
"boolean",
"number",
"string"
]
}
},
"required": [
"type"
],
"additionalProperties": false
},
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "array"
},
"items": {
"$ref": "#/properties/result/$defs/__schema0"
}
},
"required": [
"type",
"items"
],
"additionalProperties": false
},
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "object"
},
"properties": {
"type": "object",
"propertyNames": {
"type": "string"
},
"additionalProperties": {
"$ref": "#/properties/result/$defs/__schema0"
}
},
"additionalProperties": {
"type": "boolean",
"const": true
}
},
"required": [
"type",
"properties",
"additionalProperties"
],
"additionalProperties": false
},
{
"type": "object",
"properties": {
"anyOf": {
"minItems": 2,
"maxItems": 6,
"type": "array",
"items": {
"$ref": "#/properties/result/$defs/__schema0"
}
}
},
"required": [
"anyOf"
],
"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
}
Fixed example
One accepted fixed example, not a custom-input trial. No operation runs when this static page is requested.
Example input
{
"samples": [
{
"id": 1,
"tag": "a",
"tags": []
},
{
"id": 2,
"tag": null,
"tags": [
"x"
]
}
]
}
Example response
{
"operation": "json-sample-shape-infer",
"version": "0.29.0",
"result": {
"profile": "observed-json-shapes-v1",
"evidence": "observed-structure-only",
"contractEstablished": false,
"sampleCount": 2,
"dialect": "https://json-schema.org/draft/2020-12/schema",
"schema": {
"type": "object",
"properties": {
"id": {
"type": "number"
},
"tag": {
"anyOf": [
{
"type": "null"
},
{
"type": "string"
}
]
},
"tags": {
"type": "array",
"items": {
"type": "string"
}
}
},
"additionalProperties": true
},
"observations": [
{
"schemaPointer": "",
"occurrences": 2,
"typeCounts": [
{
"type": "object",
"count": 2
}
],
"objectOccurrences": 2,
"properties": [
{
"name": "id",
"presentCount": 2,
"objectCount": 2
},
{
"name": "tag",
"presentCount": 2,
"objectCount": 2
},
{
"name": "tags",
"presentCount": 2,
"objectCount": 2
}
]
},
{
"schemaPointer": "/properties/id",
"occurrences": 2,
"typeCounts": [
{
"type": "number",
"count": 2
}
]
},
{
"schemaPointer": "/properties/tag",
"occurrences": 2,
"typeCounts": [
{
"type": "null",
"count": 1
},
{
"type": "string",
"count": 1
}
]
},
{
"schemaPointer": "/properties/tags",
"occurrences": 2,
"typeCounts": [
{
"type": "array",
"count": 2
}
],
"elementOccurrences": 1
},
{
"schemaPointer": "/properties/tags/items",
"occurrences": 1,
"typeCounts": [
{
"type": "string",
"count": 1
}
]
}
]
},
"provenance": {
"inputSha256": "cd6d60c9fe4a6bf4587ba834b28f344a6e856e95e517470ced05bb3f24dedeed",
"outputSha256": "f482c987df131aeecd8ca5571ce7edc472358b72167e0f4ca417278c34d7b52a",
"deterministic": true,
"externalRequests": 0
}
}
Bounds and precision
JavaScript IEEE-754 numbers; use strings for large integer IDs/exact decimals where the schema accepts strings. No lossless numeric parsing.
{
"global": {
"requestBytes": 131072,
"responseBytes": 524288,
"jsonDepth": 32,
"jsonNodes": 20000,
"requestsPerMinute": 60,
"paidAttemptsPerMinute": 20,
"idempotencyHours": 24
},
"operation": {
"inputBytes": 100000,
"outputBytes": 300000,
"jsonNodes": 10000,
"depth": 20,
"samples": 64,
"sourceNodes": 5000,
"semanticDepth": 8,
"pooledObjectKeys": 32,
"observationLocations": 128,
"emittedSchemaNodes": 180,
"schemaValidationDepth": 16,
"schemaRepresentationDepth": 20,
"keyBytes": 96,
"aggregateSourceKeyBytes": 64000,
"aggregateSchemaPointerBytes": 32768,
"nodeVisits": 5000
}
}
Complete schemas, descriptions and cross-field validation may impose additional limits.
Proposed price and protocol definitions
{
"unit": "one successful operation call",
"proposedNominalUsd": "0.004",
"sixDecimalTokenBaseUnits": "4000",
"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."
}
Protocol definitions: x402, mpp. MPP uses Tempo charge. Paid MCP execution is unsupported. All runtime readiness is not evaluated in this build.
API path templates, not endpoints on this documentation host
{
"x402": "/v1/x402/json-sample-shape-infer",
"mpp": "/v1/mpp/json-sample-shape-infer"
}
Required headers
{
"Content-Type": "application/json",
"Idempotency-Key": "random 16–128 character operation identifier"
}
Actual SDK challenge amount, asset, network, recipient and wallet costs must pass independent authorization. Preserve identical key, body, protocol and credential on retries; on PAYMENT_UNCERTAIN stop and reconcile.
Execution profile and provider conditions
{
"deterministic": true,
"externalRequests": 0,
"maxExternalRequests": 0,
"resultSnapshotPersisted": false,
"fixedExampleIsIllustrativeSnapshot": false,
"requiresPayment": true,
"supportsMcpExecution": false
}
Deterministic supplied-input operation with no external requests or stored request/result bodies. Payment infrastructure retains payment metadata and hashes.
Failure handling
- HTTP 400: Malformed JSON, missing/invalid idempotency key, or payment identifier mismatch Correct the request before payment
- HTTP 402: Payment challenge or rejected payment Use official protocol SDK; inspect payment outcome before another payment
- HTTP 409: Idempotency conflict, duplicate proof, or PAYMENT_UNCERTAIN Keep original key, body, and proof; reconcile uncertainty with operator; never blindly repay
- HTTP 413: Input or generated output too large Reduce input; no payment attempted for validation failure
- HTTP 415: Unsupported media type or compression Send uncompressed application/json
- HTTP 422: Schema or service-specific semantic validation failure Correct input using returned error code; no payment attempted
- HTTP 429: Request/payment-attempt rate exceeded Wait for rate limit window; preserve existing payment identity
- HTTP 503: Payment configuration/provider/state unavailable, or live DNS preparation failed before settlement Check readiness; DNS preparation failures may retry the identical key/body/credential only; uncertainty requires reconciliation
Declared requirements
Before any paid call, refresh the live operation contract and POST the complete bounded budgeted plan to the separate API's /preflight. Unknown requirements block selection; compatible preflight is not permission to spend.