# Buy AI credit

> Start buying AI credit.

<div class="g1t-endpoint"><span class="g1t-method" data-method="post">POST</span><code>/workspaces/{workspace}/ai_credit/checkout</code></div>

Returns `url`, a payment page to open in a browser and pay by card; it comes back to the workspace's billing page. `amount_cents` is the credit, in whole dollars from $10 (1000) to $1,000 (100000); any card fee is added on top. The credit is added once the payment goes through. Owners only, as a person: signed in or with a personal access token. A workspace's own token and g1t's agents never buy credit.

Open `url` in a browser to pay. Nothing is charged until the payment is made there; the credit then shows in [`get_ai_credit`](/reference/api/billing/get-ai-credit/). An amount outside `min_cents` to `max_cents`, or not in whole dollars, is refused with `invalid`; a workspace that cannot buy credit (see `can_buy`) gets `conflict` or `payment_required`.

- **Authentication:** Required. Send an [access token](/reference/api/#authentication) as `Authorization: Bearer`.
- **MCP tool:** [`billing`](/reference/mcp/#billing) with `action` `buy_ai_credit`, and the same inputs
- **Scope:** An access token needs [`billing:write`](/guides/authentication/#scopes).

## Path parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `workspace` | string | Yes | The workspace's slug, e.g. "flagon-io". |

## Body parameters

Send a JSON object. Names are `snake_case`, as in responses; the `camelCase` spelling is accepted too.

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `amount_cents` | integer | Yes | The credit to buy, in cents, in whole dollars: 5000 is $50. |

## Example request

```sh
curl -X POST https://api.g1t.sh/workspaces/flagon-io/ai_credit/checkout \
  -H "Authorization: Bearer $G1T_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "amount_cents": 5000
  }'
```

## Example response

A successful request answers `200` with:

```json
{
  "url": "https://checkout.example.com/c/pay/cs_test_a1b2c3"
}
```

## Errors

A failed request answers with one of these statuses and a body like `{"error": {"code": "not_found", "message": "Repository not found."}}`. See [errors](/reference/api/#errors).

| Status | Code | When |
| --- | --- | --- |
| 401 | `unauthenticated` | A token is required, or the one sent is not valid. |
| 403 | `forbidden` | The token is valid but not allowed to do this, such as a member-only change or an agent token outside its repository. |
| 404 | `not_found` | It does not exist, or you cannot see it. |
| 409 | `conflict` | The request conflicts with the current state. |
| 422 | `invalid` | The input is not valid. `message` says which field and why. |