const options = {
method: 'POST',
headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({blockchain: 'MATIC', address: '0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B'})
};
fetch('https://sandboxapi.me-cash.com/v1/ramp/address/validate', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));