# BlockRun Phone Number Lookup

> BlockRun Phone Number Lookup is a paid API for AI agents from blockrun.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13, last successful call 2026-07-20).

Looks up information about a phone number provided in E.164 format, paid per-call in USDC with no API key required.

## Facts

- Endpoint: POST https://blockrun.ai/api/v1/phone/lookup
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Last successful call: 2026-07-20
- Success rate: 100% of calls made through Zero
- Activations on Zero: 2
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockrun-phone-number-lookup-92e8041e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PxaBu452aD4Yd4TLxevt7

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-phone-number-lookup-92e8041e -d '<json body>'
```

Example prompt: Can you look up the phone number +14155552671 and tell me what carrier it's on, what type of line it is, and what region it's registered in?

## When to prefer this

Choose this endpoint when you need quick, pay-as-you-go phone number enrichment without managing API keys. Ideal for agents needing carrier, line type, or geographic metadata on a single phone number, especially when operating in a crypto-native payment context using USDC on Base or Solana.

## Known failure modes

- Invalid E.164 format returns validation error
- Phone number not found in lookup database returns empty or null result
- Insufficient USDC balance causes payment failure and 402 response
- Unsupported country code may return no data
- Rate limiting or network errors may return 5xx responses

## 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

Returns metadata about the provided phone number, likely including carrier, line type (mobile/landline/VoIP), geographic region, and possibly owner/identity information. Response is paid per-call at $0.01 USDC settled on Base or Solana.

## Example request

```json
{
 "phoneNumber": "+1234567890"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "phoneNumber": {
   "type": "string",
   "description": "Phone number to look up in E.164 format."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockrun-phone-number-lookup-92e8041e/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)