# Block a code (POST /v1/classify/blocklist)

> POST /v1/classify/blocklist: Block a code. border.bot API reference (Classification).

Source: https://border.bot/docs/api/add-blocked-code

> Documentation index: https://border.bot/llms.txt. Every page is Markdown at its URL + `.md`.

`POST https://api.border.bot/v1/classify/blocklist`

Requires an API key (`Authorization: Bearer bb_live_…`).

Never suggest this code (or any line under it) again, for one destination or all. Adding a code that is already blocked updates its reason. Free; up to 5,000 codes.

API key scope: `settings`.

## Request body (JSON)

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `code` | string | yes |  |
| `destination` | "*" \| string | no |  |
| `reason` | string | no |  |

## Responses

- `200`: The blocked code. (`BlockedCodeResponse`)
- `400`: Invalid input (`invalid_input`). (`Error`)
- `401`: Missing, invalid, revoked or expired API key (`unauthorized`). (`Error`)
- `403`: The API key doesn’t have the `settings` scope (`forbidden`, `details.reason: "missing_scope"`). (`Error`)
- `429`: Rate limited (`rate_limited`). Retry after `Retry-After` seconds; `RateLimit` says which limit was hit (`r=0`, `t` seconds until its window ends) and `RateLimit-Policy` its quota. (`Error`)
- `500`: Unexpected error (`internal`). (`Error`)

## Example

```bash
curl -X POST 'https://api.border.bot/v1/classify/blocklist' \
  -H 'Authorization: Bearer bb_live_...' \
  -H 'Content-Type: application/json' \
  -d '{"code":"6109.10","destination":"US","reason":"Our broker files these under 6109.90"}'
```