{
  "request": {
    "method": "POST",
    "url": "https://api.0x.org/gasless/submit",
    "headers": {
      "0x-api-key": "YOUR_API_KEY",
      "0x-version": "v2",
      "Content-Type": "application/json"
    },
    "body": {
      "chainId": 1,
      "approval": {
        "type": "permit2",
        "eip712": {
          "domain": {"name": "Permit2", "chainId": 1, "verifyingContract": "0x000000000022D473030F116dDEE9F6B43aC78BA3"},
          "primaryType": "PermitTransferFrom",
          "message": {
            "permitted": {"token": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48", "amount": "1000000000"},
            "spender": "0x7F6cEE965959295cC64d0E6c00d99d6532d8e86b",
            "nonce": "0",
            "deadline": "1735689600"
          }
        },
        "signature": {
          "v": 27,
          "r": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
          "s": "0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
          "signatureType": 2
        }
      },
      "trade": {
        "type": "metatransaction_v2",
        "eip712": {
          "domain": {"name": "ZeroEx", "version": "1.0.0", "chainId": 1, "verifyingContract": "0xdef1c0ded9bec7f1a1670819833240f027b25eff"},
          "primaryType": "MetaTransactionDataV2",
          "message": {
            "signer": "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
            "sender": "0x0000000000000000000000000000000000000000",
            "expirationTimeSeconds": "1735689600",
            "salt": "1735682400",
            "callData": "0x...",
            "feeToken": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
            "fees": []
          }
        },
        "signature": {
          "v": 28,
          "r": "0xaaaa567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
          "s": "0xbbbbba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
          "signatureType": 2
        }
      }
    }
  },
  "response": {
    "status": 200,
    "body": {
      "type": "metatransaction_v2",
      "tradeHash": "0xdef0987654321fedcba0987654321fedcba0987654321fedcba0987654321fed"
    }
  }
}