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API Documentation Generator from OpenAPI Spec or Natural Language
x402
API Documentation Generator from OpenAPI Spec or Natural Language is a paid API for AI agents from api.strale.io, paid per call via x402, $0.216001/call, status unknown (last checked 2026-09-14).
Generates markdown API documentation from an OpenAPI spec or natural language description, including parameters, examples, and error codes
Price / call$0.216001
Success—
StatusUnknown
How this service works
Generate markdown API documentation from an OpenAPI spec or natural language description. Returns documentation with parameters, examples, error codes.
Output
Returns formatted markdown API documentation including parameter descriptions, request/response examples, and error code explanations, ready to publish or embed in a developer portal.
Example use cases
Example prompt
“Generate markdown API documentation for my endpoint — here's the OpenAPI spec: {paste spec here}. I need it to include parameters, usage examples, and error codes.”
Technical details
Endpoint
GEThttps://api.strale.io/x402/api-docs-generateWhen to prefer
Use this endpoint when you need to rapidly generate structured, readable markdown API documentation from either a machine-readable OpenAPI/Swagger spec or a plain English description of an endpoint. Ideal for teams that want to automate their doc pipeline, bootstrap documentation for new APIs, or produce consistent reference material without manual writing.
Side effects
- Missing both openapi_spec and endpoint_description parameters — returns error requiring at least one input
- Invalid or malformed OpenAPI spec — may return partial documentation or parsing error
- Natural language description too vague — may produce incomplete or inaccurate documentation
- Payment failure via x402 protocol — returns 402 with payment details
- Rate limit or server error — returns 5xx response
Input
{
"endpoint_description": "A REST API endpoint that retrieves user profile information. Accepts a user ID as a path parameter and returns JSON containing name, email, created_date, and account_status fields. Returns 404 if user not found, 401 if unauthorized."
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.21600000000000003,
"settlement_id": "0x72fe1ae23809457449f8db06083a04720a9a8d07275bcd63b129b138eaa1edfe"
},
"capability": "api-docs-generate",
"latency_ms": 3340,
"provenance": {
"source": "claude-haiku",
"fetched_at": "2026-06-13T04:23:37.132Z"
}
},
"markdown": "# User Profile API Documentation\n\n## Description\nA REST API endpoint that retrieves user profile information. This endpoint allows clients to fetch detailed user profile data by providing a user ID as a path parameter. The response includes comprehensive user information in JSON format.\n\n## Authentication\nThis API requires Bearer token authentication. Include your authentication token in the Authorization header of your request.\n\n## Endpoints\n\n### GET /api/users/{userId}\nRetrieves user profile information for a specified user ID.\n\n#### Parameters\n| Name | Type | Location | Required | Description |\n|------|------|----------|----------|-------------|\n| userId | string | path | yes | The unique identifier of the user |\n\n#### Request Example\n```bash\ncurl -X GET https://api.example.com/api/users/12345 \\\n -H \"Authorization: Bearer YOUR_TOKEN\" \\\n -H \"Content-Type: application/json\"\n```\n\n#### Response Example\n```json\n{\n \"id\": \"12345\",\n \"name\": \"John Doe\",\n \"email\": \"john.doe@example.com\",\n \"created_date\": \"2023-01-15T10:30:00Z\",\n \"account_status\": \"active\"\n}\n```\n\n#### Error Codes\n| Status Code | Error | Description |\n|-------------|-------|-------------|\n| 200 | OK | User profile retrieved successfully |\n| 401 | Unauthorized | Missing or invalid authentication token |\n| 404 | Not Found | User with specified ID does not exist |\n| 500 | Internal Server Error | Server error occurred while processing the request |",
"source_type": "natural_language",
"total_endpoints": 1,
"authentication_type": "bearer",
"endpoints_documented": [
{
"path": "/api/users/{userId}",
"method": "GET",
"summary": "Retrieves user profile information by user ID",
"requires_auth": true,
"parameters_count": 1
}
]
}Tags
x402
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