Confused by stream ltp > batl

[jjj123]

I saw this come through the streaming API for a single runner change, and I'm a little confused. If the last traded price (ltp) is 100, then shouldn't the best available to lay (batl) price be at least 100?

          "batl": [
            [
              0,
              1.09,
              289.48
            ]
          ],
          "ltp": 100,

[jjj123]

seems to be a frequent thing, so must be my understanding of ltp and batl. here's a full market change (mc) as an example:

{
  "id": "1.204025392",
  "rc": [
    {
      "batb": [
        [
          0,
          0,
          0
        ]
      ],
      "batl": [
        [
          0,
          1.01,
          441
        ]
      ],
      "id": 8998491,
      "ltp": 1.09,
      "trd": [
        [
          1.09,
          53.91
        ]
      ],
      "tv": 19144.42
    }
  ],
  "tv": 46116.27
}

never seen batl so low. so i could have a liability of 1p and there are no unmatched orders to back runner 8998491 at a price of 1.02 or higher?

[BetfairDeveloperProgram]

Hi jjj123


In the first example, the current best available to lay price is 1.09 and the last traded price is 100. Having a remaining amount at 100 batl would assume that the bet for 100 wasn't fully matched or that order was placed & matched at the same time as this specific update showing the new batl price at 1.09 for stake of "ltp": 289.48.

In the more complete second example, there are no orders on the back side of the market. The best available lay price is 1.01 at £441, the only lay price available. This typically happens towards the end of an in-play market for the expected 'winning' selection.

Kind Regards

Neil

[jjj123]

Sorry let me put a more complete example, which clarifies things for me. Below are two back-to-back market changes. I understand this can be near the end of the game when 8998491 has a high chance of winning. I can see how a back order at price 1.01 of a £494.91 matches the £53.91 at 1.09 and also moves batl to 1.01 with the remaining £441.

But I would expect this to only partially match 1.09 though (indeed only £26.95 is available at 1.09), and for multiple trds to be listed for each step of the ladder from 1.01 to 1.09. Is this a reasonable expectation, or am I misunderstanding something which would make this only trade at 1.09?

    {
      "id": "1.204025392",
      "rc": [
        {
          "trd": [
            [
              1.01,
              3509.16
            ]
          ],
          "batb": [
            [
              0,
              1.09,
              26.95
            ]
          ],
          "batl": [
            [
              0,
              1.2,
              109.75
            ]
          ],
          "tv": 19090.51,
          "id": 8998491
        }
      ],
      "tv": 46062.36
    }

    {
      "id": "1.204025392",
      "rc": [
        {
          "trd": [
            [
              1.09,
              53.91
            ]
          ],
          "batb": [
            [
              0,
              0,
              0
            ]
          ],
          "batl": [
            [
              0,
              1.01,
              441
            ]
          ],
          "ltp": 1.09,
          "tv": 19144.42,
          "id": 8998491
        }
      ],
      "tv": 46116.27
    }

[snowine]

It's clear. Thanks for sharing the idea.

avatar game