💰 Transfer

This guide explains how to transfer XTZ between accounts using request and response headers. Transfers can be made to both smart functions and user addresses.

1. Transfer via Request Headers

Smart functions can transfer XTZ using the X-JSTZ-TRANSFER header in requests. The recipient can access the transferred amount via the X-JSTZ-AMOUNT header.

Smart function A (Sender)

const ONE_TEZ = "1000000"; // 1 XTZ in mutez

const handler = async (request) => {
  // Transfer 1 XTZ to smart function B
  const smartFunctionB = "KT1TxqZ8QtKvLu3V3JH7Gx58n7Co8pgtpQU5";
  const call_request = new Request(`jstz://${smartFunctionB}`, {
    headers: {
      "X-JSTZ-TRANSFER": ONE_TEZ,
    },
  });
  await fetch(call_request);

  return new Response();
};

export default handler;

Smart function B (Recipient)

const handler = async (request) => {
  const transferred_amount = request.headers.get("X-JSTZ-AMOUNT");
  console.log(`Received ${transferred_amount} mutez`); // Output: Received 1000000 mutez
  return new Response();
};

export default handler;

2. Refund via Response Headers

Smart functions can refund XTZ using the X-JSTZ-TRANSFER header in responses. The original sender can access the refunded amount via the X-JSTZ-AMOUNT header in the response.

Smart function A (Sender)

const ONE_TEZ = "1000000"; // 1 XTZ in mutez

const handler = async (request) => {
  // Transfer 1 XTZ to smart function B
  const smartFunctionB = "KT1TxqZ8QtKvLu3V3JH7Gx58n7Co8pgtpQU5";
  const call_request = new Request(`jstz://${smartFunctionB}`, {
    headers: {
      "X-JSTZ-TRANSFER": ONE_TEZ,
    },
  });

  const response = await fetch(call_request);
  const refund_amount = response.headers.get("X-JSTZ-AMOUNT");
  console.log(`Received ${refund_amount} mutez back`); // Output: Received 500000 mutez back
  return new Response();
};

export default handler;

Smart function B (Refunder)

const HALF_TEZ = "500000"; // 0.5 XTZ in mutez

const handler = async (request) => {
  const transferred_amount = request.headers.get("X-JSTZ-AMOUNT");
  console.log(`Received ${transferred_amount} mutez`); // Output: Received 1000000 mutez

  // Refund 0.5 XTZ to the sender
  return new Response(null, {
    headers: {
      "X-JSTZ-TRANSFER": HALF_TEZ,
    },
  });
};

export default handler;

Important Notes

1. All amounts are specified in mutez (1 XTZ = 1,000,000 mutez)
2. Transfers can be made to:
   • Smart function addresses (KT1...)
   • User addresses (tz1...)
3. Ensure sufficient balance before initiating transfers