Validate a JSON payload against the request or response schema for one operation
Validate a JSON payload against the request or response schema for one operation in an OpenAPI 3.x or Swagger 2.x spec. Locate the operation by operationId or method+path; choose `part: "request"` or `part: "response"` (status defaults to the first 2xx). Deterministic subset of JSON Schema: type, required, enum, properties, items, additionalProperties:false, oneOf/anyOf/allOf, $ref-detection (not dereferenced).
Answeringour last check, 2026-09-24
1 of 1checks answered this week
938 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://agent402.tools/api/openapi-validate-payload
| Category | Code and developer |
|---|---|
| Provider host | agent402.tools |
| Networks | algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=, eip155:10, eip155:1329, eip155:137, eip155:143, eip155:42161, eip155:42220, eip155:43114, eip155:4663, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp, stellar:pubnet |
| Payment schemes | exact, upto |
| Self-reported calls, 30 days | 5 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 938 ms |
Example input (from the provider)
{
"body": {
"operationId": "createUser",
"part": "request",
"payload": {
"age": "thirty",
"extra": "noise",
"name": "Alice"
},
"spec": {
"openapi": "3.0.0",
"paths": {
"/users": {
"post": {
"operationId": "createUser",
"requestBody": {
"content": {
"application/json": {
"schema": {
"additionalProperties": false,
"properties": {
"age": {
"type": "integer"
},
"email": {
"type": "string"
},
"name": {
"type": "string"
},
"role": {
"enum": [
"admin",
"user"
],
"type": "string"
}
},
"required": [
"name",
"email"
],
"type": "object"
}
}
}
},
"responses": {
"201": {
"description": "ok"
}
}
}
}
}
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"method": {
"description": "HTTP method (use with `path` if no operationId)"
},
"operationId": {
"description": "operationId to validate against (preferred)"
},
"part": {
"description": "Schema to validate against: \"request\" or \"response\""
},
"path": {
"description": "Path template (use with `method` if no operationId)"
},
"payload": {
"description": "JSON value to validate"
},
"spec": {
"description": "OpenAPI/Swagger document (object or JSON string)"
},
"status": {
"description": "Response status when part=\"response\" (defaults to first 2xx)"
}
},
"required": [
"spec",
"part",
"payload"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"errors": {
"items": {
"properties": {
"message": {
"type": "string"
},
"path": {
"type": "string"
},
"rule": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"schemaPresent": {
"type": "boolean"
},
"valid": {
"type": "boolean"
}
},
"required": [
"valid",
"schemaPresent",
"errors"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}