Market solver json API

Problem (input)

{
    "description": "From table 2 in Lindsay 2018",
    "bidders": [{
            "name": "airline",
            "bids": [
                {
                    "v": 0,
                    "q": {
                        "a": 1
                    }
                },
                {
                    "v": 0,
                    "q": {
                        "b": 1
                    }
                }]
        }, {
            "name": "tourist",
            "bids": [{
                    "v": 90,
                    "q": {
                        "a": -1,
                        "b": -1
                    }
                }]
        }, {
            "name": "co-authors",
            "bids": [{
                    "v": 60,
                    "q": {
                        "a": -1
                    },
                    "xor_group": 1
                }, {
                    "v": 60,
                    "q": {
                        "b": -1
                    },
                    "xor_group": 1
                }]
        }]
}

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Solution (output)