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

# Build on Rampa Pay

> Hold a USDT balance at Rampa and let your users pay any Bolivian merchant QR in bolivianos.

You quote the end user a USDT price, they accept, and the QR is paid at that price — the merchant gets BOB. These docs are everything you need to go from zero to a completed payment in the sandbox.

| Environment | Base URL | Key |
| - | - | - |
| **Sandbox** | `https://api.staging.rampapay.com/v1` | Sandbox key from Rampa |
| **Production** | `https://api.rampapay.com/v1` | Production key from Rampa |

Sandbox and production share the same paths, bodies and errors: going live changes only the base URL and the key.

> **[A USDT wallet](/api-reference/wallet/get-wallet)**
>
> Top up by sending USDT to your address: it is credited automatically once it confirms. Your balance is what you can spend.

> **[Pay any merchant QR](/payment-flow)**
>
> Get a firm USDT quote for the QR's amount; once your user accepts, send the QR with it and it is paid at once.

> **[Nothing real moves](/sandbox)**
>
> The sandbox runs on a testnet (Tron Shasta) with a test token, and QRs go to the QR network's test environment: no merchant is ever paid.

> **[Quick start](/quickstart)**
>
> From your sandbox key to a paid QR, in ten calls.

> **[API reference](/api-reference/introduction)**
>
> Every endpoint, with a playground that calls the sandbox.


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