# AgentLine Webhook Subscription for AI Agent Phone Numbers

> AgentLine Webhook Subscription for AI Agent Phone Numbers is a paid API for AI agents from api.agentline.cloud, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Lists or filters webhook subscriptions associated with owned phone numbers on the AgentLine platform for AI agents

## Facts

- Endpoint: GET https://api.agentline.cloud/v1/x402/webhooks
- 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/agentline-webhook-subscription-for-ai-agent-phone-numbers-af383c08
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g5rBaopytl30R2YxCjw1u

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 agentline-webhook-subscription-for-ai-agent-phone-numbers-af383c08
```

Example prompt: Show me all the webhooks configured for my AgentLine number +14155550199 so I can check which events my voice agent is currently subscribed to.

## When to prefer this

Use this endpoint when you need to inspect, audit, or debug webhook configurations for AI agent phone numbers provisioned on AgentLine. It is the right choice when you want to verify which events (inbound calls, SMS) are being forwarded to your agent's webhook endpoints, or when troubleshooting missed call/message events.

## Known failure modes

- Invalid or expired lease_token returns 401 unauthorized
- Phone number not owned by the lease returns empty result or 403
- Malformed phone number format causes validation error
- Service unavailable returns 5xx with no subscription data
- Empty response body if no webhooks are registered yet

## How this service works

Get a real phone number for your AI agent in under 10 minutes. Works with OpenClaw, Hermes Agent, and any LLM. Outbound calls, SMS, and inbound voice — one API. No telecom experience needed.

## Output

Returns webhook subscription records associated with the authenticated lease token, optionally filtered to a specific owned phone number — including event types, callback URLs, and configuration details for inbound voice and SMS routing.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url",
  "phone_number"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "HTTPS URL receiving the agent's events as signed JSON POSTs"
  },
  "secret": {
   "type": "string",
   "description": "HMAC signing secret (auto-generated if omitted)"
  },
  "phone_number": {
   "type": "string",
   "description": "Your wallet-owned number whose agent gets the webhook"
  },
  "signature_header": {
   "type": "string",
   "description": "HMAC header name (default 'X-Webhook-Signature')"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string"
  },
  "secret": {
   "type": "string"
  },
  "agent_id": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentline-webhook-subscription-for-ai-agent-phone-numbers-af383c08/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentline.cloud](https://www.zero.xyz/host/api.agentline.cloud/llms.txt)