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

# API reference

> Every endpoint of the One Pay API, generated from its OpenAPI description.

**Base URL**

```
https://onepay-api-eiy9.onrender.com
```

Your API key decides the mode: `sk_test_…` for test data, `sk_live_…` for
real money. Send it as `Authorization: Bearer …` on every request
([authentication](https://pay.onemarketc.com/docs/essentials/authentication.md)).

The pages that follow are generated from the API's OpenAPI 3.1
description, also served at
[`/openapi.json`](https://onepay-api-eiy9.onrender.com/openapi.json):
import it into Postman or a code generator. Try any endpoint from its page
with a test key.

Before your first integration, read:

* [Amounts, ids and lists](https://pay.onemarketc.com/docs/essentials/conventions.md)
* [Idempotency](https://pay.onemarketc.com/docs/essentials/idempotency.md)
* [Errors](https://pay.onemarketc.com/docs/essentials/errors.md)
* [Webhooks](https://pay.onemarketc.com/docs/guides/webhooks.md)


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.