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

# StableFX API rate limits

> Per-entity rate limits and throttling behavior for all StableFX API endpoints.

Rate limits control how many requests you can make per second to each StableFX
endpoint. Limits apply per entity. Your **entity ID** is the unique identifier
assigned to your organization when you register with Circle.

StableFX counts requests with a **sliding window** algorithm. The window is one
second long. If you send more requests than the limit allows in any rolling
one-second span, the API returns an HTTP `429 Too Many Requests` response until
your rate drops below the limit.

<Note>
  If you receive a `429` response, wait briefly and retry. Use exponential delay
  between retries. Sending requests at the same rate extends the throttle.
</Note>

The following table lists the per-entity rate limits for all StableFX API
endpoints. For examples of calling these endpoints, see the
[taker quickstart](/stablefx/quickstarts/fx-trade-taker) and
[maker quickstart](/stablefx/quickstarts/fx-trade-maker). To set up the
notifications endpoint, see
[Set up a webhook endpoint](/api-reference/webhook-endpoints).

| Method | Endpoint                               | Maximum requests per second |
| ------ | -------------------------------------- | --------------------------- |
| `POST` | `/v1/exchange/stablefx/quotes`         | 10                          |
| `POST` | `/v1/exchange/stablefx/trades`         | 10                          |
| `GET`  | `/v1/exchange/stablefx/trades`         | 15                          |
| `GET`  | `/v1/exchange/stablefx/signatures/*`   | 10                          |
| `POST` | `/v1/exchange/stablefx/signatures/*`   | 10                          |
| `POST` | `/v1/exchange/stablefx/fund`           | 10                          |
| `GET`  | `/v1/exchange/stablefx/fees/{tradeId}` | 15                          |
| `POST` | `/v1/exchange/stablefx/notifications`  | 25                          |