// Check guide https://docs.8dx.io/guide

const orderBody = prepareOrderForApi(order, signature, decodeMakerTraits(order.makerTraits));

const options = {
  method: 'POST',
  body: JSON.stringify(orderBody)
  // ...
};

const blockchain = 'ethereum'; 

fetch(`https://swap.ggp.gg/api/${blockchain}/order`, options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "orderHash": "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
}