returns exchange infos for all markets
{"symbols":[{"marketId":"0x0000000000000000000000000000000000000000000000000000000000000000","symbol":"INJ/USDT PERP","type":"derivative","volume":"34.73"},{"marketId":"0x0000000000000000000000000000000000000000000000000000000000000000","symbol":"INJ/USDT PERP","type":"derivative","volume":"34.73"},{"marketId":"0x0000000000000000000000000000000000000000000000000000000000000000","symbol":"INJ/USDT PERP","type":"derivative","volume":"34.73"},{"marketId":"0x0000000000000000000000000000000000000000000000000000000000000000","symbol":"INJ/USDT PERP","type":"derivative","volume":"34.73"}]}