> For the complete documentation index, see [llms.txt](https://docs.koinbay.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.koinbay.com/api/overview.md).

# Overview

This document is the consolidated, live-verified API reference for the Koinbay spot and futures REST APIs plus the market WebSocket. 

## Live hosts

| Surface           | Base URL                                  |
| ----------------- | ----------------------------------------- |
| Spot REST         | <https://openapi.koinbay.com>             |
| Futures REST      | <https://futuresopenapi.koinbay.com>      |
| Spot WebSocket    | wss\://ws.koinbay.com/kline-api/ws        |
| Futures WebSocket | wss\://futuresws.koinbay.com/kline-api/ws |

## Authentication & signing

Trade and account endpoints require three headers:

| Header      | Value                                      |
| ----------- | ------------------------------------------ |
| X-CH-APIKEY | Your API key                               |
| X-CH-TS     | Request timestamp, Unix epoch MILLISECONDS |
| X-CH-SIGN   | HMAC-SHA256 signature, LOWERCASE HEX       |

The signature is computed over the pre-hash string:

```
timestamp + METHOD + requestPath [+ "?" + queryString] [+ body]
```

* METHOD is uppercase (GET / POST).
* **For GET with query params, append \`?\` + the exact query string.**
* For POST, append the exact JSON body string you send.
* HMAC key = your API secret. Output = **hex**.
* recvWindow (default 5000ms) bounds clock skew. Content-Type is always application/json.

**Three distinct error envelopes** (all confirmed live — clients must handle all three):

* Spot business error: \`{"code": \<int>, "msg": \<str>}\`
* Futures business error: \`{"code": "\<str>", "succ": false, "msgData": null, "msg": \<str>}\` (string code).
* Infrastructure / 404: \`{"timestamp","status","error","message","path"}\` (Spring-style) — returned by paths that don't exist.

**Order-ID precision warning:** orderId values exceed 2^53, so 64-bit-float JSON parsers (e.g. JavaScript JSON.parse) silently corrupt them. Always use the string form — spot returns orderId (number) AND orderIdString (string); futures POST /order and POST /cancel return orderId as a string. Treat all order IDs as strings.


---

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