# TD Agent Utility · Inbox Create

> TD Agent Utility · Inbox Create is a paid API for AI agents from tdagentutility.co.uk, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).

Creates a temporary callback inbox that can receive webhook events from website/deployment verification checks, returning an inbox ID and callback URL with configurable TTL.

## Facts

- Endpoint: POST https://tdagentutility.co.uk/v1/inbox-create?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/td-agent-utility-inbox-create-70a7e40b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Mdgaq-rt1WlL50bRgFoz7

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 td-agent-utility-inbox-create-70a7e40b -d '<json body>'
```

Example prompt: Create a verification inbox for me that will stay open for 3600 seconds so I can collect the results from a website deployment check.

## When to prefer this

Use this endpoint as the first step in a multi-step verification workflow where you need to receive asynchronous results from HTTP, DNS, TLS, or Chromium screenshot checks. It is the correct choice when you need a deterministic, short-lived callback URL rather than polling or synchronous responses. Prefer this over generic webhook services when the downstream tools are the TD Agent Utility verification suite.

## Known failure modes

- TTL value exceeds maximum of 86400 seconds — returns validation error
- TTL value below minimum of 1 second — returns validation error
- Payment not provided or insufficient USDC — returns 402 Payment Required
- Service temporarily unavailable — returns 5xx error
- Inbox creation quota exceeded — may return error with quota details

## How this service works

Independent website and deployment verification for AI agents: HTTP, DNS, TLS and Chromium screenshot evidence. Three deterministic tools, x402 V2 Base USDC.

## Output

Returns a JSON object containing a unique inbox_id, a callback_url where verification events should be posted, an expires_at Unix timestamp, max_event_size and max_event_count limits, a result_status of PASS or FAIL, a checked_at ISO timestamp, and any warnings encountered during creation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ttl": {
   "anyOf": [
    {
     "type": "integer",
     "maximum": 86400,
     "minimum": 1
    },
    {
     "type": "null"
    }
   ],
   "title": "Ttl",
   "default": null
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tool": "inbox_create",
  "inbox_id": "",
  "warnings": [],
  "checked_at": "2026-10-15T00:00:00Z",
  "expires_at": 0,
  "callback_url": "",
  "result_status": "PASS",
  "max_event_size": 0,
  "max_event_count": 0
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/td-agent-utility-inbox-create-70a7e40b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tdagentutility.co.uk](https://www.zero.xyz/host/tdagentutility.co.uk/llms.txt)