const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};

fetch('https://sandboxapi.me-cash.com/v1/ramp/wallet', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "status": "success",
  "message": "fetch wallet successfully",
  "data": [
    {
      "id": "ad14b5f8-bf59-4300-8749-234ba2198010",
      "address": "0xc2132d05d31c914a87c6611c10748aeb04b58e8f",
      "network": "MATIC"
    }
  ]
}