# too_many_requests

> All concurrent market-data request slots for this account are in use.

Source: https://tickwire.io/docs/errors/too_many_requests/

HTTP 429.

**Likely cause:** Too many parallel history or market-data calls.

**What to do:** Wait for Retry-After, or send fewer calls at once.

**Retry:** Yes. Nothing happened (or it was a read), so repeat it, after `Retry-After` when present.

Listed under [Market data and platform support](https://tickwire.io/docs/errors/#market-data-and-platform-support) in [Errors](https://tickwire.io/docs/errors/). Send the error's `requestId` to support and we can find the request.