# BlockRun Voice Call — AI Agent Phone Caller

> BlockRun Voice Call — AI Agent Phone Caller is a paid API for AI agents from blockrun.ai, paid per call via x402, $0.54/call, status unknown (last checked 2026-09-15).

Places an AI-driven outbound phone call to a specified number, executing a defined task on behalf of the agent, settled in USDC per call.

## Facts

- Endpoint: POST https://blockrun.ai/api/v1/voice/call
- Price: $0.54/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockrun-voice-call-ai-agent-phone-caller-e57098fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ulnOedAFvtxuX6U3U7gGz

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 blockrun-voice-call-ai-agent-phone-caller-e57098fe -d '<json body>'
```

Example prompt: Call +1-415-555-0198 and ask them to confirm our reservation for tomorrow at 7pm under the name Johnson — make the call right now.

## When to prefer this

Choose this endpoint when you need an AI agent to make a real outbound phone call to complete a task — such as booking appointments, gathering information, or delivering a message — and want pay-per-call USDC billing with no API key setup. Prefer this over SMS or email endpoints when voice interaction is required.

## Known failure modes

- Invalid E.164 phone number format — call cannot be routed
- Insufficient USDC balance — payment fails, call not placed
- Ambiguous or malformed task description — AI agent unable to execute call objective
- Destination number unreachable or busy — call fails mid-execution
- Payment settlement failure on Base or Solana — call rejected before connection

## How this service works

Pay for the outcome. One endpoint for every model, tool and data source an agent needs — each call priced before it runs, at the best value per dollar. 103 models and 100 data and tool APIs.

## Output

The agent receives a response indicating whether the outbound AI phone call was placed and what the AI agent accomplished during the call, including any information gathered or confirmations obtained.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string",
   "description": "Destination phone number (E.164)."
  },
  "task": {
   "type": "string",
   "description": "What the AI agent should do on the call."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockrun-voice-call-ai-agent-phone-caller-e57098fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockrun.ai](https://www.zero.xyz/host/blockrun.ai/llms.txt)