# Exende Temporary Callback URL Creator

> Exende Temporary Callback URL Creator is a paid API for AI agents from api.exende.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Creates a short-lived public webhook endpoint (callback URL) for receiving asynchronous HTTP callbacks without deploying infrastructure

## Facts

- Endpoint: POST https://api.exende.dev/v1/callbacks
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/exende-temporary-callback-url-creator-a5872a5b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_E9Fw00MbnZQrvTai-UVaJ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability exende-temporary-callback-url-creator-a5872a5b -d '<json body>'
```

Example prompt: Create a temporary public callback URL for me — I need an HTTP endpoint that accepts JSON POST requests so my workflow can receive an async response without me spinning up a server.

## When to prefer this

Choose this endpoint when an agent, script, or backend workflow needs a temporary public URL to receive a one-time or short-lived HTTP POST callback without provisioning real infrastructure. It is ideal for agentic pipelines where a third-party service or API requires a webhook URL to return async results, and no persistent server is available or warranted. Prefer it over dedicated webhook services when the x402 micropayment model fits and simplicity of provisioning matters.

## Known failure modes

- Invalid body structure — if the input object does not include required fields (type, method, bodyType, body), the request will fail with a validation error
- Unsupported method or body type — only POST method and JSON body type are accepted; other values will be rejected
- Payment failure — the $0.01 USDC x402 payment must succeed or the endpoint will not be provisioned
- URL expiry — the callback URL is short-lived and may expire before the async response arrives if timing is not accounted for
- Rate limiting — repeated rapid calls may be throttled

## How this service works

Create a temporary public webhook endpoint for AI agents and automated workflows that need to receive asynchronous callbacks from external services. Returns a callback URL plus read and wait endpoints. No server deployment, signup, API key, or subscription required.

## Output

A newly created temporary public callback URL (HTTP endpoint) that accepts POST requests with a JSON body, usable immediately by external services or agents to deliver asynchronous responses without requiring server deployment.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/exende-temporary-callback-url-creator-a5872a5b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.exende.dev](https://www.zero.xyz/host/api.exende.dev/llms.txt)