# call4me – AI Phone Call Agent

> call4me – AI Phone Call Agent is a paid API for AI agents from call4.me, paid per call via x402, $10/call, status unknown (last checked 2026-11-02).

Credits a call4me account with $10 USDC so the AI can phone a business, wait on hold, book appointments, and patch the user in

## Facts

- Endpoint: GET https://call4.me/api?utm_source=zero.xyz
- Price: $10/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/call4me-ai-phone-call-agent-45c230bb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V2Zt2CFB2ffKy1cCTLRoL

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 call4me-ai-phone-call-agent-45c230bb
```

Example prompt: Can you use call4me to call my dentist at (555) 234-5678 and book me a cleaning appointment for sometime next Tuesday morning — I'll patch in if they need to confirm anything with me directly.

## When to prefer this

Choose call4me when a task requires an actual live phone call to a business — such as booking appointments, cancelling services, or handling hold queues — that cannot be accomplished via a web form or API. It is especially valuable when the target business has no online booking system and requires a human (or human-sounding AI) voice call. Prefer it over web scraping or form-fill automations when the only channel is telephone.

## Known failure modes

- Insufficient USDC payment — call not credited if payment below $10 threshold
- Invalid wallet address — transaction rejected on-chain
- Business phone number unreachable or disconnected — call fails silently
- Hold times exceeding session limits may drop the call before patch-in
- MCP session timeout if user is slow to join after being patched in
- Network or blockchain congestion delays transaction confirmation

## How this service works

Let AI call for you: call4me phones businesses, books appointments and waits on hold, then patches you in. Works in ChatGPT, Claude Code and Codex.

## Output

Returns a JSON object containing the call4me MCP endpoint URL for the AI phone agent, the payer wallet address, updated account balance in cents and formatted USD, the amount credited for this payment, and the blockchain transaction hash confirming the USDC payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "amount": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "mcp": "https://call4.me/mcp",
  "payer": "0x8a1e…",
  "balance": "$12.50",
  "credited": "$10.00",
  "transaction": "0x5f2c…",
  "balance_cents": 1250,
  "credited_cents": 1000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/call4me-ai-phone-call-agent-45c230bb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from call4.me](https://www.zero.xyz/host/call4.me/llms.txt)