# Palmyr Phone Number SMS Send

> Palmyr Phone Number SMS Send is a paid API for AI agents from palmyr.ai, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-10).

Sends an SMS or message via a specific Palmyr-provisioned phone number, paid with USDC on Solana or Base via x402.

## Facts

- Endpoint: POST https://palmyr.ai/phone/numbers/%7Bid%7D/send
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/palmyr-phone-number-sms-send-74f91e6b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N18e46mYgq4HPADu12v7F

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 palmyr-phone-number-sms-send-74f91e6b -d '<json body>'
```

Example prompt: Using my Palmyr phone number abc123, send a text message to +14155552671 saying 'Your appointment is confirmed for tomorrow at 10am'.

## When to prefer this

Use this endpoint when an AI agent needs to send an outbound SMS or text message from a specific Palmyr-provisioned phone number and is paying with USDC on Solana or Base via the x402 protocol. Prefer this over generic SMS APIs when operating in a crypto-native or agent-autonomous payment context.

## Known failure modes

- Invalid phone number ID returns 404 not found
- Insufficient USDC balance causes x402 payment failure
- Malformed recipient phone number causes 400 bad request
- Palmyr infrastructure downtime causes 503 service unavailable
- Message body too long triggers validation error

## How this service works

Autonomous infrastructure for AI agents — pay with USDC on Solana or Base via x402.

## Output

The agent receives a delivery status response indicating whether the SMS was successfully dispatched, along with a message ID for tracking, after the $0.05 USDC x402 payment is processed.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "properties": {
    "body": {
     "type": "object",
     "additionalProperties": true
    }
   }
  },
  "output": {
   "properties": {
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/palmyr-phone-number-sms-send-74f91e6b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from palmyr.ai](https://www.zero.xyz/host/palmyr.ai/llms.txt)