---
title: "Check whether a send would be allowed"
method: POST
path: "/sendability"
tags: ["Sending"]
---

# Check whether a send would be allowed

`POST /sendability`

## Request

- Base URL: `https://api.primitive.dev/v1`
- URL: `https://api.primitive.dev/v1/sendability`
- Auth: HTTP bearer

Answer whether the caller could send to the given recipient (from the given address, if any) without sending anything. summary explains a refusal in plain words.

## Headers

- `Idempotency-Key` string

## Request body

- CheckSendabilityRequest
  - `to` string, required
  - `from` string

## Response `200`

Check whether a send would be allowed

- object
  - `success` true, required
  - `data` CheckSendabilityResult, required
    - `allowed` boolean, required
    - `summary` string, required

## Other responses

- `400`: Invalid request parameters
- `401`: Invalid or missing API key
- `403`: Authenticated caller lacks permission for the operation
- `429`: Rate limit exceeded. The `ratelimit-*` headers describe the limiter that rejected this request, with its own limit and window, not the API budget that successful responses report. A limiter that reports only a wait sends `Retry-After` alone.

---

[API](https://skmtc.dev/primitive/apis/primitive-api.md) - [All operations](https://skmtc.dev/primitive/apis/primitive-api/llms.txt) - [OpenAPI document](https://skmtc.dev/primitive/apis/primitive-api/revisions/bce409c97acb?raw)