# FAQ

> Common questions about payment, models, privacy and errors.

## Payment

**How do I top up?** Currently manually — email us at support@example.com. Crypto
top-up is coming soon.

**Is there a subscription or a minimum payment?** No, only pay-as-you-go
charges from a prepaid balance. How requests are priced is covered in
[Balance and pricing](https://ai-seller.vibe-codes.ru/en/docs/pricing).

**Am I charged for errors?** No, if the request was rejected before the
response started. If a stream broke off mid-response, or you aborted the
request yourself after HTTP 200, the input and the output generated so far are
charged.

**Why do I get a 402 when there is money on the balance?** The remainder is
held by the reserve of requests still in progress. Retry once they finish.

## Models and formats

**Which models are available?** `GET /v1/models` returns the current list — see
[Models](https://ai-seller.vibe-codes.ru/en/docs/models).

**Why does a model work in Chat Completions but not in Messages?** The gateway
does not translate between request formats: a model works on endpoints whose
format its provider supports. See
[API overview](https://ai-seller.vibe-codes.ru/en/docs/endpoints#request-format-and-model).

**Can I use `previous_response_id` or the Files API?** No: the gateway keeps no
provider-side state. Send the conversation history and files (base64 or links)
with every request.

## Keys and security

**Can I see my key again?** Yes, with “Show key” in the cabinet's Keys
section. The key is stored encrypted.

**How do I cap one application's spending?** Issue a separate key for it and
set a spend limit on the key.

**Does the gateway pass my identifiers to the provider?** No: `user`,
`safety_identifier`, `metadata` and your request headers do not reach the
provider; the gateway's identifier is sent instead. On `/v1/responses`
conversations are not stored at the provider (`store: false`).

## Errors

**What do I do about a 429?** Wait for the pause in `Retry-After` and retry —
SDKs do it themselves. It usually means your account has too many concurrent
requests. See [Limits](https://ai-seller.vibe-codes.ru/en/docs/limits).

**What should I include when contacting support?** The `request_id` from the
error body or the `x-request-id` response header — it identifies the exact
request.