---
title: "Send an SMS from an agent's phone number. First message compliance: Your initial SMS to any new contact must include (1) your brand name, (2) opt-in confirmation, and (3) opt-out instructions (e.g., \"Reply STOP to unsubscribe\"). Non-compliant first messages may be silently filtered by carriers."
method: POST
path: "/agentphone/v1/messages"
tags: ["AgentPhone"]
---

# Send an SMS from an agent's phone number. First message compliance: Your initial SMS to any new contact must include (1) your brand name, (2) opt-in confirmation, and (3) opt-out instructions (e.g., "Reply STOP to unsubscribe"). Non-compliant first messages may be silently filtered by carriers.

`POST /agentphone/v1/messages`

## Response `200`

Successful response

## Other responses

- `402` — Payment Required (x402 / MPP / np)

---

[API](https://skmtc.net/orthogonal/apis/orthogonal-api-marketplace.md) · [All operations](https://skmtc.net/orthogonal/apis/orthogonal-api-marketplace/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/orthogonal/orthogonal-api-marketplace/revisions/fe6145f924f0/schema)