> For the complete documentation index, see [llms.txt](https://docs.coindpay.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coindpay.xyz/landing/start/developers/on-off-ramps.md).

# On/Off-Ramps

We have opened access to our On/Off-Ramps Buy/Sell Crypto routing service, offering a clean and user-friendly one-stop assets transaction dashboard.\
Developers can easily integrate the Buy/Sell Crypto flow via an `iframe`, and monitor real-time transaction logs at: <https://coindpay.xyz/scan>

***

**Buy Crypto**

<https://coindpay.xyz/wallet?crypto=buy>

<table><thead><tr><th width="243.1343994140625">Parameter</th><th>Type</th><th>Example</th><th width="90.1044921875">Status</th><th>Description</th></tr></thead><tbody><tr><td><code>crypto</code></td><td><code>string*</code></td><td><code>buy</code>  or  <code>sell</code></td><td>✅</td><td>Required. <br>Enables buy or sell crypto mode.</td></tr><tr><td><code>appid</code></td><td><code>string?</code></td><td><code>6787***816de</code></td><td>✅</td><td>Your unique merchant Id<br>claim <a href="https://coindpay.xyz/account">account</a><br>Only KYB-verified appid can receive <code>webhooks</code> push.</td></tr><tr><td><code>merchant_transaction_id</code></td><td><kbd>string?</kbd></td><td><a data-mention href="/pages/YDXHM7aKp9sJhJZB7ZjT#url-parameters">/pages/YDXHM7aKp9sJhJZB7ZjT#url-parameters</a></td><td>✅</td><td><kbd>merchant_transaction_id=xxx123</kbd></td></tr><tr><td><code>fiatCurrency</code></td><td><code>string?</code></td><td><code>EUR</code>, <code>USD</code>, <code>JPY</code></td><td>✅</td><td>Optional. The fiat currency code the user wants to pay with (ISO format).<br><a data-mention href="/pages/r67FarAduWyVbyLS4OK5">/pages/r67FarAduWyVbyLS4OK5</a><br></td></tr><tr><td><code>fiatAmount</code></td><td><code>number?</code></td><td><code>100</code></td><td>✅</td><td>Optional. Buy/Sell amount in the supported fiat or crypto currency format.<br><mark style="background-color:purple;"><strong>Lmimits #</strong></mark><a data-mention href="/pages/r67FarAduWyVbyLS4OK5">/pages/r67FarAduWyVbyLS4OK5</a></td></tr><tr><td><code>cryptoToken</code></td><td><code>string?</code></td><td><code>usdc</code>, <code>eth</code>, <code>btc</code></td><td>✅</td><td>Optional. The crypto asset the user wants to buy or sell.</td></tr><tr><td><code>address</code></td><td><code>string?</code></td><td>'0xxxxx'</td><td>❌</td><td><mark style="background-color:$danger;">Temporarily disabled due to security risks.</mark><br>The wallet address used to receive the crypto you purchase, or to transfer funds when you sell crypto.</td></tr></tbody></table>

EUR as fiat pay-in, buy `SOL` token

<https://coindpay.xyz/wallet?crypto=buy&fiatCurrency=EUR&fiatAmount=100&cryptoToken=SOL>

***

**Sell Crypto**

<https://coindpay.xyz/wallet?crypto=sell>\
\
USD as fiat pay-out, sell `USDC` token

<https://coindpay.xyz/wallet?crypto=sell&fiatCurrency=USD&fiatAmount=100&cryptoToken=USDC>