openapi-to-mcp
Convert an OpenAPI spec (JSON/YAML, URL or inline) into MCP tool definitions: LLM-safe unique names, descriptions, JSON Schema inputSchema (query/path/header params + JSON body), MCP annotations (readOnly/destructive/idempotent), plus HTTP forwarding hints and a ready tools/list response.
Endpoint
GET|POST https://forge-tools.dentreprise.workers.dev/api/openapi-to-mcp
Parameters
| Name | Required | Type | Description |
|---|---|---|---|
url | Optional | string | Spec URL |
spec | Optional | object | Inline spec (POST) |
base_url | Optional | string | Override server URL |
Example request (unpaid — expect 402)
curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/openapi-to-mcp?url=https%3A%2F%2Fpetstore3.swagger.io%2Fapi%2Fv3%2Fopenapi.json"
Example 402 challenge
The same object is also sent as a base64 PAYMENT-REQUIRED header. Amounts are atomic USDC units (6 decimals).
{
"x402Version": 2,
"error": "Payment required",
"resource": {
"url": "https://forge-tools.dentreprise.workers.dev/api/openapi-to-mcp",
"description": "Convert an OpenAPI spec (JSON/YAML, URL or inline) into MCP tool definitions: LLM-safe unique names, descriptions, JSON Schema inputSchema (query/path/header params + JSON body), MCP annotations (readOnly/destructive/idempotent), plus HTTP forwarding hints and a ready tools/list response.",
"mimeType": "application/json"
},
"accepts": [
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "3000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]
}Retry with payment
curl -sS "https://forge-tools.dentreprise.workers.dev/api/openapi-to-mcp?url=https%3A%2F%2Fpetstore3.swagger.io%2Fapi%2Fv3%2Fopenapi.json" \ -H "PAYMENT-SIGNATURE: $PAYMENT"
Example response
{
"count": 19,
"tools": [
{
"name": "getPetById",
"inputSchema": {
"type": "object"
}
}
]
}Related endpoints
mcp-manifest-lint
MCP manifest linter: validates an MCP registry server.
mcp-inspect
Remote MCP server inspector (Streamable HTTP): initialize handshake, protocol version, serverInfo, capabilities, session, latency, tools/list with per-tool checks (name pattern, description, inputSchema object, undocumented or missing required params), resources/prompts counts.