# Task APIs FAQ

> Short answers to the questions developers ask most, each with the page that explains it.

### Am I charged for a failed job?

Only for what it delivered. Submitting holds the estimate; when the job ends, delivered outputs are
charged and the rest of the hold comes back, whether the job succeeded, failed or was cancelled
([Pricing](https://docs.refabric.com/task-apis/pricing#what-is-charged)).

### What happens when I run out of credits?

A submit your balance does not cover is refused with `402 insufficient_credits`, which says how much
was required and what you have; nothing runs. A job that already started keeps its hold
([Pricing](https://docs.refabric.com/task-apis/pricing#credits)).

### Do credits expire?

Yes. A plan's credits renew each billing period; a credit pack ends on its own date. `GET /v1/account/balance` lists when yours run out
([Pricing](https://docs.refabric.com/task-apis/pricing#credits)).

### How long are my files kept?

Until you delete them: files and records have no automatic deletion
([Data retention & storage](https://docs.refabric.com/task-apis/data-retention-and-storage)).

### Are file URLs public?

Yes. A file's `url` is not signed and does not expire, so anyone who has it can fetch the file
([Files and media](https://docs.refabric.com/task-apis/files-and-media#download-urls)).

### Can I call the API from a browser?

Call the API from your server, or put a proxy in front of it ([Proxy setup](https://docs.refabric.com/task-apis/calling-tasks/proxy-setup)).

### Why was my request refused for its content?

The request's content was refused, and the answer is `content_refused`. Change the input
and submit again; only delivered outputs are charged ([Task errors](https://docs.refabric.com/task-apis/errors/task-errors#errors-inside-a-job)).

### What happens to a field the task does not know?

A field the task does not know never fails the request; it simply has no effect. The flip side: a
misspelled name has no effect either, so check names against the task's schema
([Conventions](https://docs.refabric.com/api-reference/platform/conventions#requests)).

### What does `409 result_not_ready` mean?

You read the result of a job that has not ended yet. Read the job until its `lifecycle` is
`terminal`, or use a webhook ([Asynchronous jobs](https://docs.refabric.com/task-apis/calling-tasks/asynchronous-jobs#result)).

### Why do my images have a watermark?

Trial accounts receive watermarked images. The `file`
stays the same when your plan changes ([Files and media](https://docs.refabric.com/task-apis/files-and-media#download-urls)).

### Is there a rate limit?

Yes, a request rate per API key, and a rate per IP address for reads that need no key. Over it you
get `429` with `Retry-After` ([Limits](https://docs.refabric.com/task-apis/limits#rate-limits)).

### Can I get an invoice or a volume discount?

Your balance, with links to your plan and invoices, is in **Panel › Billing**. For volume pricing,
contact us ([Support](https://docs.refabric.com/support)).

### I can't access my account. What do I do?

Contact us from the address on [Support](https://docs.refabric.com/support) with the e-mail you sign in with. Never send an API
key.