"sellToken": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"buyToken": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
"sellAmount": "10000000000",
"buyAmount": "4959721654652700610",
"receiver": "0x0000000000000000000000000000000000000000",
"appData": "0xf785fae7a7c5abc49f3cd6a61f6df1ff26433392b066ee9ff2240ff1eb7ab6e4",
"partiallyFillable": false,
"sellTokenBalance": "erc20",
"buyTokenBalance": "erc20",
"signingScheme": "ethsign",
"signature": <0x encoded signature from step 4>
"from": "0x55fe002aeff02f77364de339a1292923a15844b8"