Bug in API? INVALID_ODDS reply

[Zhong]

Hi all,

Recently I often encounter the failure of placing the order from time to time.

The execution report looks like this:

PlaceExecutionReport : Status=FAILURE : ErrorCode=BET_ACTION_ERROR : MarketId=1.112329375 : CustomerRef= : InstructionReport[0]={Status=FAILURE : ErrorCode=INVALID_ODDS : Instruction={OrderType=LIMIT : SelectionId=6987980 : Handicap=0 : Side=BACK : LimitOrder=Size=2 : Price=3.1 : PersistenceType=LAPSE} : BetId= : PlacedDate= : AveragePriceMatched= : SizeMatched=}

I cannot see why the price 3.1 is an invalid odds.

Do you also encounter this problem? Is it a bug?

Thanks a lot!

[AlgoTrader]

Your JSON is seems to be broken.

LimitOrder=Size=2

That's certainly nonsense. Please provide exact JSON request, it should be something like this for JsonRPC:

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "SportsAPING/v1.0/placeOrders",
  "params": {
    "marketId": "1.112335290",
    "instructions": [
      {
        "orderType": "LIMIT",
        "selectionId": 2248499,
        "side": "LAY",
        "limitOrder": {
          "price": 3.1,
          "size": 5,
          "persistenceType": "LAPSE"
        }
      }
    ],
    "customerRef": "2013-12-30T11:01:40.969Z"
  }
}

[Zhong]

Hi AlgoTrader, first of all, thanks a lot for your reply during the holiday period! And wish you happy new year!

I checked my C# code and it seems that the error is because of the odds that I submitted: 3.1000000001d as represented by the C# double value. Even though it's shown as 3.1 as feedbacked by the Betfair report, it's not valid. So I added a rounding function to 2 decimals and it works perfect now.

[RDFHDFFDDVG]

Zhong, 3.1 is valid, however the further up you go the further apart the valid odds for example 6.1 is not valid (if I copied the terms correctly) as it is to 0.2 decimal places. In C# you should look at a precision decimal type to avoid floating point rounding issues.

(<= 1M basp 2.01M) basp
(<= 2.02M basp 3.04M) (resolve-to 0.02M basp dir)
(<= 3.05M basp 4M) (resolve-to 0.05M basp dir)
(<= 4.01M basp 6M) (resolve-to 0.1M basp dir)
(<= 6.01M basp 10M) (resolve-to 0.2M basp dir)
(<= 10.01M basp 21M) (resolve-to 1M basp dir)