# AgentServices Voice Call — Text-to-Speech Phone Call

> AgentServices Voice Call — Text-to-Speech Phone Call is a paid API for AI agents from agentservices.to, paid per call via x402, $0.54/call, status healthy (last checked 2026-09-14, last successful call 2026-09-03).

Places an outbound phone call to a specified number and speaks a custom message using text-to-speech, paid via x402 micropayment on Base.

## Facts

- Endpoint: POST https://agentservices.to/v1/calls
- Price: $0.54/call
- Payment: x402
- Status: healthy
- Last checked: 2026-09-14
- Last successful call: 2026-09-03
- Success rate: 100% of calls made through Zero
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentservices-voice-call-text-to-speech-phone-call-1f10dec9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pwVBMJcbWp6BIuHzMxUMj

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 agentservices-voice-call-text-to-speech-phone-call-1f10dec9 -d '<json body>'
```

Example prompt: Call +12025551234 and say 'Your package has been delivered to the front door. Please collect it at your earliest convenience.'

## When to prefer this

Choose this endpoint when an AI agent needs to deliver a spoken message to a real phone number programmatically, especially in agentic workflows that require voice notifications, alerts, or reminders without requiring a human to manually place a call. Prefer it over SMS or email APIs when voice delivery is explicitly needed. Best suited for single, targeted outbound calls paid per-call via x402 micropayments on Base.

## Known failure modes

- Invalid or non-E.164 phone number format — call not placed
- Insufficient USDC balance for x402 micropayment — payment failure
- Empty or missing message field — TTS has nothing to speak
- Network or telephony provider error — call fails to connect
- Rate limiting or abuse prevention rejection

## How this service works

AI voice call — outbound phone call with text-to-speech

## Output

Returns a response indicating whether the outbound call was successfully initiated, including call status or confirmation details. The response schema is currently unspecified, so the agent should expect a basic success/failure indicator.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "to"
 ],
 "properties": {
  "to": {
   "type": "string",
   "description": "Phone number to call (E.164 format, e.g., +1234567890)"
  },
  "message": {
   "type": "string",
   "description": "Message to speak on the call (text-to-speech)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentservices-voice-call-text-to-speech-phone-call-1f10dec9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentservices.to](https://www.zero.xyz/host/agentservices.to/llms.txt)