Sandbox testing guide

MoonPay provides a dedicated sandbox environment designed for integration development and testing. Using this sandbox helps you identify potential issues early, confirm compatibility, and minimize risks during deployment.

Sandbox on-ramp widget

You can test our on-ramp widget below:

Initialize the MoonPay widget

Initialize the MoonPay widget using your test API key with our SDK or with a simple URL:

Widget embed URL

https://buy.moonpay.com/?apiKey=pk_test_INSERT_YOUR_API_KEY

Using your test API key with this widget URL will automatically switch the environment to our sandbox. Your API key can be found on the Developers Page in your MoonPay dashboard.

Create a sandbox test account

Know Your Customer (KYC) information entered will not be verified and when asked for documents you can skip by clicking on the “Skip document submission” button. Add a US or UK address for sandbox accounts, since these work best with our test credit cards.

Sandbox token and testnet support

Our sandbox environment supports the following tokens and testnets:

Token	Testnet	Notes
Bitcoin	Testnet3
Ethereum	Sepolia
ERC-20 tokens	Sepolia	Transfers will use our ERC-20 MoonPayToken.
Solana	Testnet
Binance Coin	Testnet
TON	Testnet
Stellar	Testnet
Litecoin	Testnet

Add a payment method

At the payment screen choose the debit/credit card option and enter one of the following test card numbers. Do not enter authentic payment card information, as this will result in a failed transaction.

Card Type	Card Number	Expiration	CVC code
MasterCard 3DS Challenge (USA)	5385 3083 6013 5181	12/2030	123
Visa 3DS Frictionless (UK)	4485 0403 7153 6584	12/2030	123
Visa 3DS Challenge (UK)	4242 4242 4242 4242	12/2030	123

Test card for declined transactions

Card type	Card number	Expiration	CVC code
Visa Insufficient funds	4544 2491 6767 3670	12/2030	123

Test card for off-ramp payouts

Card type	Card number	Expiration	CVC code
Visa Direct payout	4000 0209 5159 5032	12/2030	123

Returning testnet tokens

After testing, return testnet coins to us at the wallet addresses below.

Blockchain	Testnet wallet address
Bitcoin	tb1q45h8zexwztmz3nyd8gmkxhpavdsva4znwwhzvs
Bitcoin Cash	bchtest:qrn45hfjpqd0w5p7dur5a2aasgp3nj8d8qh4exym5k
Ethereum	0xc216eD2D6c295579718dbd4a797845CdA70B3C36
Litecoin	tltc1qjrv8pm0lumhyjkrrevk3p7wpwhtuz7e22mujw0
Ripple	rUZTCFB6zPyeEmDhrAVqVbBaLPWrzjKCQz
Flow & FUSD	0x4c6903af5fb0f9f2
Stellar	GD4KAFADEFXOLNWWUA4IZI5YG23AH2OSJMIJAZ6YLNHJWNPX3T366FIY

---

Sandbox failure reasons

• Transaction processing failed may happen when the testnet wallet is empty or you used the wrong card. Reach out to your MoonPay representative.
• Your Region is Not Supported means MoonPay may not support your country or the cryptocurrency is unsupported in your region. New York, USA is not supported in sandbox but is supported in production.
• You've made too many actions or You can't perform this action means you have been rate limited. This happens when we detect unusual behavior and is not uncommon for partners to experience this while testing. Wait ~20 minutes before trying again.
• Account is restricted or blocked may happen if you are using a production MoonPay user account in sandbox or entered otherwise triggered one of our automated flags for suspicious behavior.

Empty testnet wallet

An empty testnet wallet will result in a Transaction processing failed error when you and other developers try to complete transactions. You may top up the wallet with your own testnet coins or use any available online faucet to top up Sepolia ETH.