Decide whether an API change breaks your clients, operation by operation
Decide whether an API change breaks your clients, operation by operation. Compares parameters, request bodies, responses and security across two OpenAPI documents, and classifies each change by who it breaks: the clients that call the API or the clients that read its responses. A newly required parameter breaks callers; a widened response enum breaks readers. A change it cannot classify is never counted as safe.
Not tested: has real-world effectsour last check, 2026-10-04
0 of 0checks answered this week
n/amedian answer time
$0.25listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.zfinia.com/x402/v1/openapi-breaking-change-audit
| Category | Code and developer |
|---|---|
| Provider host | api.zfinia.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"after": {
"components": {
"schemas": {
"Order": {
"properties": {
"id": {
"type": "string"
},
"status": {
"enum": [
"open",
"shipped",
"disputed"
],
"type": "string"
},
"tenant_id": {
"type": "string"
},
"total": {
"type": "number"
}
},
"required": [
"id",
"total",
"tenant_id"
],
"type": "object"
}
},
"securitySchemes": {
"apiKey": {
"in": "query",
"name": "api_key",
"type": "apiKey"
}
}
},
"info": {
"title": "Orders API",
"version": "2.0.0"
},
"openapi": "3.1.0",
"paths": {
"/orders": {
"get": {
"operationId": "listOrdersV2",
"parameters": [
{
"in": "query",
"name": "tenant",
"required": true,
"schema": {
"type": "string"
}
}
],
"responses": {
"200": {
"content": {
"application/json": {
"schema": {
"items": {
"$ref": "#/components/schemas/Order"
},
"type": "array"
}
}
},
"description": "A page of orders"
}
},
"summary": "List orders"
},
"parameters": [
{
"in": "query",
"name": "page",
"schema": {
"minimum": 1,
"type": "integer"
}
}
],
"post": {
"operationId": "createOrder",
"requestBody": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Order"
}
}
},
"required": true
},
"responses": {
"201": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Order"
}
}
},
"description": "Created"
}
},
"summary": "Create an order"
}
},
"/orders/{id}": {
"get": {
"deprecated": true,
"operationId": "getOrder",
"parameters": [
{
"in": "path",
"name": "id",
"schema": {
"type": "string"
}
}
],
"responses": {
"200": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Order"
}
}
},
"description": "The order"
},
"404": {
"description": "Not found"
}
},
"summary": "Fetch one order"
}
}
},
"security": [
{
"apiKey": []
}
]
},
"before": {
"components": {
"schemas": {
"Order": {
"properties": {
"id": {
"type": "string"
},
"legacy_ref": {
"type": "string"
},
"status": {
"enum": [
"open",
"shipped"
],
"type": "string"
},
"total": {
"type": "number"
}
},
"required": [
"id",
"total"
],
"type": "object"
}
},
"securitySchemes": {
"apiKey": {
"in": "header",
"name": "X-Api-Key",
"type": "apiKey"
}
}
},
"info": {
"title": "Orders API",
"version": "1.4.0"
},
"openapi": "3.1.0",
"paths": {
"/legacy/export": {
"get": {
"operationId": "legacyExport",
"responses": {
"200": {
"description": "A CSV export"
}
},
"summary": "Legacy export"
}
},
"/orders": {
"get": {
"operationId": "listOrders",
"responses": {
"200": {
"content": {
"application/json": {
"schema": {
"items": {
"$ref": "#/components/schemas/Order"
},
"type": "array"
}
}
},
"description": "A page of orders"
},
"429": {
"description": "Rate limited"
}
},
"summary": "List orders"
},
"parameters": [
{
"in": "query",
"name": "page",
"schema": {
"minimum": 1,
"type": "integer"
}
}
],
"post": {
"operationId": "createOrder",
"requestBody": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Order"
}
}
}
},
"responses": {
"201": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Order"
}
}
},
"description": "Created"
}
},
"summary": "Create an order"
}
},
"/orders/{id}": {
"get": {
"operationId": "getOrder",
"parameters": [
{
"in": "path",
"name": "id",
"schema": {
"type": "string"
}
}
],
"responses": {
"200": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/Order"
}
}
},
"description": "The order"
},
"404": {
"description": "Not found"
}
},
"summary": "Fetch one order"
}
}
},
"security": [
{
"apiKey": []
}
]
},
"role": "both"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"after": {
"type": "object"
},
"before": {
"type": "object"
},
"role": {
"enum": [
"producers",
"consumers",
"both"
],
"type": "string"
}
},
"required": [
"before",
"after"
],
"type": "object"
},
"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": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}