Gassless swap giving "missing parameter" error #1
Description
Hi there,
I’m trying to perform a gasless swap on Base network, either
from USDC → Virtual, or
from USDC → USDT.
However, every attempt to call the swap API fails with the following response:
{ "error_code": 100, "message": "missing parameter" }
What I’ve tried
Verified that all required fields (tokenIn, tokenOut, amount, slippage, chainId, userAddress, permit data, etc.) are included.
Tested both GET and POST methods where applicable.
Attempted with multiple parameter formats (camelCase, snake_case).
Confirmed API key and wallet addresses are valid.
Environment
Network: Base
Tokens: USDC → Virtual / USDC → USDT
Language/SDK: JavaScript (Node / Axios)
Response status: 201
API version: latest
{ "from": "0xxx", "to": "0xxx", "data": "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", "amountDecimals": 100000, "feeAmount1": 4840, "feeAmount2": 4830, "flag": 2, "gasPriceDecimals": 2229716, "deadline": 1762042260, "inToken": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913", "outToken": "0xfde4c96c8593536e31f229ea8f37b2ada2699bb2", "nonce": 5, "permit": "0x30f20000000000000", "hash": "0xe76982c09198885d423073613b3268e276ec03e1caffa015eafkkc4387448c83" }