---
title: "Create Flex Investment"
method: POST
path: "/api/v4/main-account/smart-flex/investments/invest"
tags: ["Crypto Lending - Flex"]
---

# Create Flex Investment

`POST /api/v4/main-account/smart-flex/investments/invest`

## Request

- Base URL: `https://whitebit.com`
- URL: `https://whitebit.com/api/v4/main-account/smart-flex/investments/invest`
- Auth: API key in header `X-TXC-APIKEY` and API key in header `X-TXC-PAYLOAD` and API key in header `X-TXC-SIGNATURE`
- TypeScript: <https://skmtc.dev/whitebit/apis/whitebit-private-http-api-v4/docs/api/v4/main-account/smart-flex/investments/invest/post.ts> (a function with typed inputs; its response is checked against the schema)

Create new investment in a Flex plan.

<Warning>
Rate limit: 1000 requests/10 sec.
</Warning>

<Note>
The API does not cache the response.
</Note>

## Request body

- object
  - `plan` string, required: Plan external ID (UUID).
  - `amount` string, required: Investment amount.
  - `withReinvest` boolean: Enable auto-reinvestment.
  - `request` string, required: Request signature
  - `nonce` integer, required: Unique request identifier

## Response `201`

Investment created successfully

- object
  - `data` object
    - `transaction_id` string: Transaction ID for the investment

## Other responses

- `400`: Request validation failed
- `422`: Inner validation failed Response error codes: - 0 - Validation failed (plan unavailable/paused, amount too small, private plan, investment cap exceeded) - 2 - Amount is less than min investment amount - 3 - Amount is greater than max investment amount - 4 - Not enough balance to create investment

---

[API](https://skmtc.dev/whitebit/apis/whitebit-private-http-api-v4.md) - [All operations](https://skmtc.dev/whitebit/apis/whitebit-private-http-api-v4/llms.txt) - [OpenAPI document](https://skmtc.dev/whitebit/apis/whitebit-private-http-api-v4/revisions/76c9def9942f?raw)