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API

caution

Our API is still in alpha — things may change or break at any time!

Manifold currently supports a basic, read-only API for getting information about our markets.

If you have questions, come chat with us on Discord. We’d love to hear about what you build!

List out all markets

/v0/markets

  • Example request

    http://manifold.markets/api/v0/markets
  • Example response

    [
    {
    "id":"FKtYX3t8ZfIp5gytJWAI",
    "creatorUsername":"JamesGrugett",
    "creatorName":"James Grugett",
    "createdTime":1645139406452,
    "closeTime":1647406740000,
    "question":"What will be the best assessment of the Free response feature on March 15th?",
    "description":"Hey guys, let's try this out!\nWe will see how people use the new Free response market type over the next month. Then I will pick the answer that I think best describes the consensus view of this feature on March 15th. Cheers.",
    "tags":[
    "ManifoldMarkets"
    ],
    "url":"https://manifold.markets/JamesGrugett/what-will-be-the-best-assessment-of",
    "pool":null,
    "probability":0,
    "volume7Days":100,
    "volume24Hours":100,
    "isResolved":false,
    ...
    }
  • Response type: Array of LiteMarket

    // Information about a market, but without bets or comments
    type LiteMarket = {
    // Unique identifer for this market
    id: string

    // Attributes about the creator
    creatorUsername: string
    creatorName: string
    createdTime: number
    creatorAvatarUrl?: string

    // Market attributes. All times are in milliseconds since epoch
    closeTime?: number // Min of creator's chosen date, and resolutionTime
    question: string
    description: string
    tags: string[]
    url: string

    pool: number
    probability: number
    volume7Days: number
    volume24Hours: number
    isResolved: boolean
    resolutionTime?: number
    resolution?: string
    }

Get information about one market

/v0/market/[marketId]

  • Example request

    https://manifold.markets/api/v0/market/3zspH9sSzMlbFQLn9GKR
  • Example response

    {
    "id": "3zspH9sSzMlbFQLn9GKR",
    "creatorUsername": "Austin",
    "creatorName": "Austin Chen",
    "createdTime": 1644103005345,
    "closeTime": 1667894340000,
    "question": "Will Carrick Flynn win the general election for Oregon's 6th District?",
    "description": "The Effective Altruism movement usually stays out of politics, but here is a recent, highly-upvoted endorsement of donating to Carrick Flynn as a high-impact area: https://forum.effectivealtruism.org/posts/Qi9nnrmjwNbBqWbNT/the-best-usd5-800-i-ve-ever-donated-to-pandemic-prevention\nFurther reading: https://ballotpedia.org/Oregon%27s_6th_Congressional_District_election,_2022\n\n#EffectiveAltruism #Politics",
    "tags": ["EffectiveAltruism", "Politics"],
    "url": "https://manifold.markets/Austin/will-carrick-flynn-win-the-general",
    "pool": 400.0916328426886,
    "probability": 0.34455568984059187,
    "volume7Days": 326.9083671573114,
    "volume24Hours": 0,
    "isResolved": false,
    "bets": [
    {
    "createdTime": 1644103005345,
    "isAnte": true,
    "shares": 83.66600265340756,
    "userId": "igi2zGXsfxYPgB0DJTXVJVmwCOr2",
    "amount": 70,
    "probAfter": 0.3,
    "probBefore": 0.3,
    "id": "E1MjiVYBM0GkqRXhv5cR",
    "outcome": "NO",
    "contractId": "3zspH9sSzMlbFQLn9GKR"
    },
    {
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "probAfter": 0.3,
    "shares": 54.77225575051661,
    "userId": "igi2zGXsfxYPgB0DJTXVJVmwCOr2",
    "isAnte": true,
    "createdTime": 1644103005345,
    "id": "jn3iIGwD5f0vxOHxo62o",
    "amount": 30,
    "probBefore": 0.3,
    "outcome": "YES"
    },
    {
    "shares": 11.832723364874056,
    "probAfter": 0.272108843537415,
    "userId": "PkBnU8cAZiOLa0fjxiUzMKsFMYZ2",
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "outcome": "NO",
    "amount": 10,
    "id": "f6sHBab6lbGw9PsnVXdc",
    "probBefore": 0.3,
    "createdTime": 1644203305863
    },
    {
    "userId": "BTksWMdCeHfDitWVaAZdjLSdu3o1",
    "amount": 10,
    "id": "Vfui2KOQwy7gkRPP7xc6",
    "shares": 18.12694184700382,
    "outcome": "YES",
    "createdTime": 1644212358699,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "probBefore": 0.272108843537415,
    "probAfter": 0.3367768595041322
    },
    {
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "probAfter": 0.3659259259259259,
    "userId": "BTksWMdCeHfDitWVaAZdjLSdu3o1",
    "probBefore": 0.3367768595041322,
    "amount": 5,
    "outcome": "YES",
    "createdTime": 1644433184238,
    "id": "eGI1VwAWF822LkcmOUot",
    "shares": 8.435122540124937
    },
    {
    "userId": "NHA7Gv9nNpb7b60GpLD3oFkBvPa2",
    "shares": 59.79133423528123,
    "amount": 50,
    "probAfter": 0.24495867768595042,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "createdTime": 1644693685223,
    "probBefore": 0.3659259259259259,
    "id": "fbU0DbmDWMnubggpQotw",
    "outcome": "NO"
    },
    {
    "amount": 25,
    "userId": "iXw2OSyhs0c4QW2fAfK3yqmaYDv1",
    "probAfter": 0.20583333333333328,
    "outcome": "NO",
    "shares": 28.3920247989266,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "createdTime": 1644695698202,
    "id": "k9hyljJD3MMXK2OYxTsR",
    "probBefore": 0.24495867768595042
    },
    {
    "createdTime": 1644716782308,
    "shares": 11.17480183821209,
    "probBefore": 0.20583333333333328,
    "userId": "clvYFhVDzccYu20OUc5NBKJyDxj2",
    "probAfter": 0.1927679500520291,
    "id": "yYkZ4JpLgZHrRQUugpCD",
    "outcome": "NO",
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "amount": 10
    },
    {
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "outcome": "YES",
    "amount": 30,
    "id": "IU2Hb1DesgKIN140BkhE",
    "shares": 58.893424111838016,
    "createdTime": 1644736846538,
    "probBefore": 0.1927679500520291,
    "userId": "BTksWMdCeHfDitWVaAZdjLSdu3o1",
    "probAfter": 0.3289359861591695
    },
    {
    "isSold": true,
    "userId": "5zeWhzi9nlNNf5C9TVjshAN7QOd2",
    "createdTime": 1644751343436,
    "outcome": "NO",
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "amount": 25,
    "probBefore": 0.3289359861591695,
    "id": "fkCxVH7THaDbEhyJjXVk",
    "probAfter": 0.2854194032651529,
    "shares": 30.022082866721178
    },
    {
    "probAfter": 0.2838618650900295,
    "id": "Ao05LRRMXVWw8d7LtwhL",
    "outcome": "NO",
    "probBefore": 0.2854194032651529,
    "shares": 1.1823269994736165,
    "userId": "pUF3dMs9oLNpgU2LYtFmodaoDow1",
    "amount": 1,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "createdTime": 1644768321860
    },
    {
    "id": "LJ8H8DTuK7CH9vN3u0Sd",
    "createdTime": 1644771352663,
    "shares": 113.5114039238785,
    "probAfter": 0.17510453314667793,
    "outcome": "NO",
    "amount": 100,
    "probBefore": 0.2838618650900295,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "userId": "ebX5nzwrs8V0M5UynWvbtcj7KAI2"
    },
    {
    "outcome": "YES",
    "amount": 20,
    "probBefore": 0.17510453314667793,
    "id": "TECEF9I5FqTqt6uTIsJX",
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "createdTime": 1644805061501,
    "shares": 43.88281646028875,
    "userId": "lHxg3179e4amWm5LJhJoJrcWK482",
    "probAfter": 0.24160019644701852
    },
    {
    "amount": -25.908367157311375,
    "id": "G3u2EzETWOyrGo15wtiQ",
    "outcome": "NO",
    "createdTime": 1644847494264,
    "sale": {
    "betId": "fkCxVH7THaDbEhyJjXVk",
    "amount": 25.862948799445807
    },
    "probAfter": 0.26957595409437557,
    "shares": -30.022082866721178,
    "probBefore": 0.24160019644701852,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "userId": "5zeWhzi9nlNNf5C9TVjshAN7QOd2"
    },
    {
    "createdTime": 1644853733891,
    "userId": "lbTXACtCnIacKDloKfXxYkDn0zM2",
    "amount": 10,
    "id": "z443uCkbYRLZW9QdXu1u",
    "probAfter": 0.25822886066938844,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "outcome": "NO",
    "shares": 11.655141043149968,
    "probBefore": 0.26957595409437557
    },
    {
    "userId": "BTksWMdCeHfDitWVaAZdjLSdu3o1",
    "amount": 15,
    "shares": 28.311399392675895,
    "id": "axoryV664uzHZ0jzWSXR",
    "outcome": "YES",
    "probBefore": 0.25822886066938844,
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "createdTime": 1644863335939,
    "probAfter": 0.3033936853512369
    },
    {
    "createdTime": 1644987330420,
    "id": "jHAYDdZRkDw3lFoDXdmm",
    "shares": 26.353902809992064,
    "userId": "BTksWMdCeHfDitWVaAZdjLSdu3o1",
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "probAfter": 0.34455568984059187,
    "probBefore": 0.3033936853512369,
    "amount": 15,
    "outcome": "YES"
    }
    ],
    "comments": [
    {
    "contractId": "3zspH9sSzMlbFQLn9GKR",
    "userUsername": "Celer",
    "userAvatarUrl": "https://lh3.googleusercontent.com/a/AATXAJwp0vAolZgOmT7GbzFq7mOf8lr0BFEB_LqWWfZk=s96-c",
    "userId": "NHA7Gv9nNpb7b60GpLD3oFkBvPa2",
    "text": "It's a D+3 district, and the person we're pushing is functionally an outsider. I maxed my donation, but 25%, what I bought down to, implying even odds on both the general and the primary, seems if anything optimistic.",
    "createdTime": 1644693740967,
    "id": "fbU0DbmDWMnubggpQotw",
    "betId": "fbU0DbmDWMnubggpQotw",
    "userName": "Celer"
    }
    ]
    }

  • Response type: A FullMarket

    // A complete market, along with bets and comments
    type FullMarket = LiteMarket & {
    bets: Bet[]
    comments: Comment[]
    }

    type Bet = {
    id: string
    contractId: string

    amount: number // bet size; negative if SELL bet
    outcome: string
    shares: number // dynamic parimutuel pool weight; negative if SELL bet

    probBefore: number
    probAfter: number

    sale?: {
    amount: number // amount user makes from sale
    betId: string // id of bet being sold
    }

    isSold?: boolean // true if this BUY bet has been sold
    isAnte?: boolean

    createdTime: number
    }

/v0/slug/[marketSlug]

This is a convenience endpoint for getting info about a market from it slug (everything after the last slash in a market’s URL).

  • Example request
    https://manifold.markets/api/v0/slug/will-carrick-flynn-win-the-general
  • Response type: A FullMarket ; same as above.

Deprecated

Changelog

  • 2022-02-28: Add resolutionTime to markets, change closeTime definition
  • 2022-02-19: Removed user IDs from bets
  • 2022-02-17: Released our v0 API, with /markets, /market/[marketId], and /slug/[slugId]