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Openapi Resolve Refs

by OpenAPI $ref resolver in Documents & files

x402 APIPassing, checked 3 h ago

Inline every local `$ref` in an OpenAPI 3.x or Swagger 2.x document so downstream tools see a self-contained spec. Resolves `#/components/...` (OpenAPI) and `#/definitions/...` (Swagger) JSON-pointer refs anywhere in the document, including inside components themselves. Per-branch cycle detection: if A→B→A, the second A is left as a `$ref` and recorded under `circular`. External refs (http://, file://, ./other.yaml) are never fetched - they're reported under `external` and left as-is.

POST
https://agent402.tools/api/openapi-resolve-refs
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
273 ms
434 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agent402.tools/api/openapi-resolve-refs

Each call costs $0.001 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://agent402.tools/api/openapi-resolve-refs
content-type: application/json

{
  "spec": {
    "components": {
      "parameters": {
        "UserId": {
          "in": "path",
          "name": "id",
          "required": true,
          "schema": {
            "type": "string"
          }
        }
      },
      "schemas": {
        "User": {
          "properties": {
            "id": {
              "type": "string"
            },
            "name": {
              "type": "string"
            }
          },
          "type": "object"
        }
      }
    },
    "info": {
      "title": "Demo",
      "version": "1.0.0"
    },
    "openapi": "3.0.0",
    "paths": {
      "/users/{id}": {
        "get": {
          "parameters": [
            {
              "$ref": "#/components/parameters/UserId"
            }
          ],
          "responses": {
            "200": {
              "content": {
                "application/json": {
                  "schema": {
                    "$ref": "#/components/schemas/User"
                  }
                }
              },
              "description": "ok"
            }
          }
        }
      }
    }
  }
}

Parameters

ParameterTypeRequiredDescription
specanyYesOpenAPI/Swagger document (object or JSON string)

Example response

The provider's example. We can't check it without paying. Shortened for display.

Example response, 62 lines
{
  "circular": [],
  "external": [],
  "resolved": 2,
  "spec": {
    "components": {
      "parameters": {
        "UserId": {
          "in": "path",
          "name": "id",
          "required": true,
          "schema": {
            "type": "string"
          }
        }
      },
      "schemas": {
        "User": {
          "properties": {
            "id": {
              "type": "string"
            },
            "name": {
              "type": "string"
            }
          },
          "type": "object"
        }
      }
    },
    "info": {
      "title": "Demo",
      "version": "1.0.0"
    },
    "openapi": "3.0.0",
    "paths": {
      "/users/{id}": {
        "get": {
          "parameters": [
            {
              "in": "path",
              "name": "id",
              "required": true,
              "schema": {
                "type": "string"
              }
            }
          ],
          "responses": {
            "200": {
              "content": {
                "application/json": {}
              },
              "description": "ok"
            }
          }
        }
      }
    }
  },
  "unresolved": []
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent402.tools/api/openapi-resolve-refs' \
  -H 'content-type: application/json' \
  --data-raw '{"spec":{"components":{"parameters":{"UserId":{"in":"path","name":"id","required":true,"schema":{"type":"string"}}},"schemas":{"User":{"properties":{"id":{"type":"string"},"name":{"type":"string"}},"type":"object"}}},"info":{"title":"Demo","version":"1.0.0"},"openapi":"3.0.0","paths":{"/users/{id}":{"get":{"parameters":[{"$ref":"#/components/parameters/UserId"}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/User"}}},"description":"ok"}}}}}}}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://agent402.tools/api/openapi-resolve-refs' \
  -H 'content-type: application/json' \
  --data-raw '{"spec":{"components":{"parameters":{"UserId":{"in":"path","name":"id","required":true,"schema":{"type":"string"}}},"schemas":{"User":{"properties":{"id":{"type":"string"},"name":{"type":"string"}},"type":"object"}}},"info":{"title":"Demo","version":"1.0.0"},"openapi":"3.0.0","paths":{"/users/{id}":{"get":{"parameters":[{"$ref":"#/components/parameters/UserId"}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/User"}}},"description":"ok"}}}}}}}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fopenapi-resolve-refs&method=POST
const res = await pay("https://agent402.tools/api/openapi-resolve-refs", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "spec": {
      "components": {
        "parameters": {
          "UserId": {
            "in": "path",
            "name": "id",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        },
        "schemas": {
          "User": {
            "properties": {
              "id": {
                "type": "string"
              },
              "name": {
                "type": "string"
              }
            },
            "type": "object"
          }
        }
      },
      "info": {
        "title": "Demo",
        "version": "1.0.0"
      },
      "openapi": "3.0.0",
      "paths": {
        "/users/{id}": {
          "get": {
            "parameters": [
              {
                "$ref": "#/components/parameters/UserId"
              }
            ],
            "responses": {
              "200": {
                "content": {
                  "application/json": {
                    "schema": {
                      "$ref": "#/components/schemas/User"
                    }
                  }
                },
                "description": "ok"
              }
            }
          }
        }
      }
    }
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agent402.tools/api/openapi-resolve-refs",
        json={
            "spec": {
                "components": {
                    "parameters": {
                        "UserId": {
                            "in": "path",
                            "name": "id",
                            "required": True,
                            "schema": {
                                "type": "string",
                            },
                        },
                    },
                    "schemas": {
                        "User": {
                            "properties": {
                                "id": {
                                    "type": "string",
                                },
                                "name": {
                                    "type": "string",
                                },
                            },
                            "type": "object",
                        },
                    },
                },
                "info": {
                    "title": "Demo",
                    "version": "1.0.0",
                },
                "openapi": "3.0.0",
                "paths": {
                    "/users/{id}": {
                        "get": {
                            "parameters": [
                                {
                                    "$ref": "#/components/parameters/UserId",
                                },
                            ],
                            "responses": {
                                "200": {
                                    "content": {
                                        "application/json": {
                                            "schema": {
                                                "$ref": "#/components/schemas/User",
                                            },
                                        },
                                    },
                                    "description": "ok",
                                },
                            },
                        },
                    },
                },
            },
        },
    )
    print(res.status_code, res.text)

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