---
title: Rate limits — Reference
description: None today. The product is unlimited SMS + voice for the subscription year.
url: https://agentnumber.really.com/docs/reference/rate-limits
doc_version: "1.0.0"
last_updated: "2026-05-15"
---

> ## Documentation index
> Fetch the complete documentation index at: https://agentnumber.really.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Rate limits

> None today. The product is unlimited SMS + voice for the subscription year. We don't impose per-token, per-number, or per-IP throttles at the API layer.

## What you might still hit

- **Carrier-level limits** — the upstream wireless carrier may rate-limit very high outbound SMS volumes, like any consumer line. Not a contract from us; a fact of cellular.
- **Single-active-call constraint on voice** — one number, one live call. [/voice/dial](/docs/reference/voice-dial) returns `409` if the number is already on a call.
- **Compute capacity** — sustained pathological load (e.g. thousands of concurrent presence WS connections per number) can degrade. We don't pre-throttle; we'll talk if it happens.

## What we don't do

- No `X-RateLimit-*` headers.
- No `429` responses on normal traffic.
- No tiered pricing. One subscription = unlimited use.

## Why

Agent Number is sold as carrier-grade SMS + voice for AI agents. Rate-limiting an agent's API would defeat the use case (OTP catchers, voice agents at scale). The price reflects unlimited use; we plan capacity to it.

## Sitemap

- [Overview](/docs/)
- [Quickstart](/docs/quickstart)
- [Authentication](/docs/auth)
- [SMS](/docs/sms)
- [Voice](/docs/voice)
- [MCP](/docs/mcp)
- [Payment](/docs/payment)

See the full [sitemap.md](/sitemap.md) for the complete index of docs pages.

---

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