Placing multiple bets on a single request

[brickwall3031]

I tried to place the following bet on the API:
```
{"jsonrpc": "2.0","method": "SportsAPING/v1.0/placeOrders","params": {"marketId": ["1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107063"],"instructions": [{"selectionId": ["2", "3", "8", "5", "6", "7", "10", "7044482"],"handicap": ["0.0", "0.0", "0.0", "0.0", "0.0", "0.0", "0.0", "3.5"],"side": ["BACK", "BACK", "BACK", "BACK", "BACK", "BACK", "BACK", "BACK"],"orderType": "LIMIT","limitOrder": {"size": ["0.09", "0.09", "16.54", "0.09", "0.09", "20.1", "0.09", "50.9"],"price": ["1000.0", "1000.0", "5.6", "1000.0", "1000.0", "9.6", "1000.0", "1.82"],"persistenceType": "LAPSE"}}]},"id": 1}
```
However I got the following error message:

```
{'jsonrpc': '2.0', 'error': {'code': -32602, 'message': 'DSC-0018'}, 'id': 1}
```
the docs are suggesting i am missing a field ("A parameter marked as mandatory was not provided") but I don't see which one? Can you place multiple bets on a single request like the above or do they have to be split up into individual bets?

[bfexplorer]

Of course, you can place multiple bets through api, here is my short code for a bot using PlaceBets:

https://gist.github.com/StefanBelo/3...2a8798d2497c10

[jabe]

I tried to place the following bet on the API:
```
{"jsonrpc": "2.0","method": "SportsAPING/v1.0/placeOrders","params": {"marketId": ["1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107060", "1.188107063"],"instructions": [{"selectionId": ["2", "3", "8", "5", "6", "7", "10", "7044482"],"handicap": ["0.0", "0.0", "0.0", "0.0", "0.0", "0.0", "0.0", "3.5"],"side": ["BACK", "BACK", "BACK", "BACK", "BACK", "BACK", "BACK", "BACK"],"orderType": "LIMIT","limitOrder": {"size": ["0.09", "0.09", "16.54", "0.09", "0.09", "20.1", "0.09", "50.9"],"price": ["1000.0", "1000.0", "5.6", "1000.0", "1000.0", "9.6", "1000.0", "1.82"],"persistenceType": "LAPSE"}}]},"id": 1}
```
However I got the following error message:

```
{'jsonrpc': '2.0', 'error': {'code': -32602, 'message': 'DSC-0018'}, 'id': 1}
```
the docs are suggesting i am missing a field ("A parameter marked as mandatory was not provided") but I don't see which one? Can you place multiple bets on a single request like the above or do they have to be split up into individual bets?

That's an interesting interpretation!

You seem to have twigged that in JSON square brackets denote an array (which may contain 0 or 1 or more items). Curly brackets do not

What you've done is assume - correctly - that instructions is an array, but incorrectly that the items within instructions are also arrays. What you needed to do was this:

instructions: [{bet1 instructions}, {bet2 instructions}, {bet3 instructions}, etc]

So it'll look something like this:

instructions: [
{"selectionId":"48671", "handicap":"0", "side":"LAY", "orderType":"LIMIT", "limitOrder":{"size": "2.2", "price": "3", "persistenceType": "LAPSE"}},
{"selectionId":"122301", "handicap":"0", "side":"LAY", "orderType":"LIMIT", "limitOrder":{"size": "4", "price": "6", "persistenceType": "LAPSE"}}, {"selectionId":"23741", "handicap":"0", "side":"BACK", "orderType":"LIMIT", "limitOrder":{"size": "5.34", "price": "1.4", "persistenceType": "LAPSE"}},
etc
]

[geoffw123]

As Jabe says, your structuring of the data is not close to correct, also you dont need the multiple marketId's either. Here is an example of a working placeOrder JSON string for 3 multiple BACK bets.

{"jsonrpc":"2.0","method":"SportsAPING/v1.0/placeOrders","params":{"marketId":"1.188549489","instructions":[{"orderType":"LIMIT","selectionId":10040289,"handicap":0.0,"side":"BACK","limitOrder":{"size":2.0,"price":2.3,"persistenceType":"PERSIST"}},{"orderType":"LIMIT","selectionId":13104412,"handicap":0.0,"side":"BACK","limitOrder":{"size":2.0,"price":12.0,"persistenceType":"PERSIST"}},{"orderType":"LIMIT","selectionId":11461775,"handicap":0.0,"side":"BACK","limitOrder":{"size":2.0,"price":16.0,"persistenceType":"PERSIST"}}],"customerRef":"11:49:14_00002453","marketVersion":null,"customerStrategyRef":null,"locale":null},"id":1}

[LiamP]

https://github.com/liampauling/betfair

[brickwall3031]

thanks all, above makes sense. geoffw123 on the market Ids bit, how will it differentiate what bets you are putting on which market? in my original example i have 7 bets on the first market id and 1 bet on the second, how would the API know which is which? (I know the selection ids and handicap can differentiate but not necessarily)

[jabe]

thanks all, above makes sense. geoffw123 on the market Ids bit, how will it differentiate what bets you are putting on which market? in my original example i have 7 bets on the first market id and 1 bet on the second, how would the API know which is which? (I know the selection ids and handicap can differentiate but not necessarily)

I've had a look at the documents and each placeOrders call can only place bets for one market, so you'll need to have two calls in the case you mention, one for each market.

[brickwall3031]

interesting, thanks. Would I be much worse off doing a series of single bets instead of combining them like above? (thinking it may be awkward to program a way to populate the json string with a combination of bets). Would the risk of price moves/bets not being matched be much greater?

[LiamP]

interesting, thanks. Would I be much worse off doing a series of single bets instead of combining them like above? (thinking it may be awkward to program a way to populate the json string with a combination of bets). Would the risk of price moves/bets not being matched be much greater?

Use betfairlightweight and focus on the fun stuff instead?