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OpenAPI 3.x Document Validator
x402
OpenAPI 3.x Document Validator is a paid API for AI agents from modell.halowerk.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Validates an OpenAPI 3.x document and reports structural errors that would prevent a machine consumer from parsing or using it correctly.
Price / call$0.002
Success—
StatusUnknown
How this service works
Reads an OpenAPI 3.x document and reports what would stop a machine consumer. Errors: missing openapi, info or paths; a path that declares no method; an internal $ref that resolves to nothing; a parameter without a name, location or schema; a request body without content.
Output
A structured report listing each validation error found in the submitted OpenAPI 3.x document. Errors include: missing top-level fields (openapi, info, paths), paths declaring no HTTP method, internal $ref values that resolve to nothing, parameters missing name, location, or schema, and request bodies missing a content definition. A clean document returns no errors.
Example use cases
Pre-publish API spec sanity check
“Before I publish this OpenAPI spec to our developer portal, can you run it through the validator and tell me every structural error that would stop a client from generating an SDK from it?”
CI pipeline spec linting
“I want to add a step to my CI pipeline that rejects any OpenAPI 3.x document with broken internal $refs or parameters missing their name, location, or schema — can you validate this spec and show me all the issues?”
Debugging a broken MCP tool conversion
“I'm trying to convert my OpenAPI spec into MCP tools but the conversion keeps failing — can you validate the spec and pinpoint whether there are paths with no methods or request bodies missing content definitions?”
Technical details
Endpoint
POSThttps://modell.halowerk.com/v1/openapi-validateWhen to prefer
Choose this endpoint when you need fast, machine-focused validation of an OpenAPI 3.x document — specifically to catch the structural errors that break API client generators, MCP converters, or other automated consumers. It is purpose-built to flag the exact issues (missing fields, broken $refs, incomplete parameters, empty request bodies) that cause downstream tooling failures, making it ideal as a pre-processing step before passing a spec to OpenAPI-to-MCP converters or schema comparison tools.
Side effects
- Submitting a non-OpenAPI document (e.g. JSON Schema or Swagger 2.x) may produce unexpected or misleading errors
- Malformed JSON/YAML that cannot be parsed will fail before validation begins
- Very large specifications may exceed request size limits
- External $refs (URLs or file paths) are not resolved — only internal $refs are checked
- Partial or truncated documents may produce incomplete error reports
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| document | object | The OpenAPI document as JSON. |
| require_examples | boolean | Report operations with no example as a warning. |
| require_operation_ids | boolean | Report operations without operationId as a warning. |
Tags
x402
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