---
title: "Door 2, step 2: bind the key to the wallet — persistent identity, 1M units/month, one key per wallet"
method: POST
path: "/keys/bind"
---

# Door 2, step 2: bind the key to the wallet — persistent identity, 1M units/month, one key per wallet

`POST /keys/bind`

## Request

- Base URL: `https://flexyield.io`
- URL: `https://flexyield.io/keys/bind`
- Auth: HTTP bearer

## Request body

- object
  - `address` string, required
  - `signature` string, required

## Response `200`

bound: true plus the welcome

- object

## Other responses

- `401`: Invalid or missing API key (-32001)
- `422`: Signature or nonce invalid

---

[API](https://skmtc.dev/flexyield/apis/flexyield-api.md) · [All operations](https://skmtc.dev/flexyield/apis/flexyield-api/llms.txt) · [OpenAPI document](https://skmtc.dev/flexyield/apis/flexyield-api/revisions/bad139887e25?raw)