API
caution
Our API is still in alpha — things may change or break at any time!
If you have questions, come chat with us on Discord. We’d love to hear about what you build!
General notes
Some APIs are not associated with any particular user. Other APIs require authentication.
APIs that require authentication accept an Authorization
header in one of two formats:
Authorization: Key {key}
. A Manifold API key associated with a user account. Each account may have zero or one API keys. To generate an API key for your account, visit your user profile, click "edit", and click the "refresh" button next to the API key field at the bottom. You can click it again any time to invalidate your existing key and generate a new one.Authorization: Bearer {jwt}
. A signed JWT from Firebase asserting your identity. This is what our web client uses. It will probably be annoying for you to generate and we will not document it further here.
API requests that accept parameters should either have the parameters in the query string if they are GET requests, or have a body with a JSON object with one property per parameter if they are POST requests.
API responses should always either have a body with a JSON result object (if the response was a 200) or with a JSON object representing an error (if the response was a 4xx or 5xx.)
Endpoints
GET /v0/user/[username]
Gets a user by their username. Remember that usernames may change.
Requires no authorization.
GET /v0/user/by-id/[id]
Gets a user by their unique ID. Many other API endpoints return this as the userId
.
Requires no authorization.
GET /v0/me
Returns the authenticated user.
GET /v0/groups
Gets all groups, in no particular order.
Requires no authorization.
GET /v0/groups/[slug]
Gets a group by its slug.
Requires no authorization.
GET /v0/groups/by-id/[id]
Gets a group by its unique ID.
Requires no authorization.
GET /v0/markets
Lists all markets, ordered by creation date descending.
Parameters:
limit
: Optional. How many markets to return. The maximum and the default is 1000.before
: Optional. The ID of the market before which the list will start. For example, if you ask for the most recent 10 markets, and then perform a second query for 10 more markets withbefore=[the id of the 10th market]
, you will get markets 11 through 20.
Requires no authorization.
Example request
https://manifold.markets/api/v0/markets?limit=1
Example response
[
{
"id":"EvIhzcJXwhL0HavaszD7",
"creatorUsername":"Austin",
"creatorName":"Austin",
"createdTime":1653850472294,
"creatorAvatarUrl":"https://lh3.googleusercontent.com/a-/AOh14GiZyl1lBehuBMGyJYJhZd-N-mstaUtgE4xdI22lLw=s96-c",
"closeTime":1653893940000,
"question":"Will I write a new blog post today?",
"tags":[
"personal",
"commitments"
],
"url":"https://manifold.markets/Austin/will-i-write-a-new-blog-post-today",
"pool":146.73022894879944,
"probability":0.8958175225896258,
"p":0.08281474972181882,
"totalLiquidity":102.65696071594805,
"outcomeType":"BINARY",
"mechanism":"cpmm-1",
"volume":241,
"volume7Days":0,
"volume24Hours":0,
"isResolved":true,
"resolution":"YES",
"resolutionTime":1653924077078
},
...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 // milliseconds since epoch
creatorAvatarUrl?: string
// Market attributes. All times are in milliseconds since epoch
closeTime?: number // Min of creator's chosen date, and resolutionTime
question: string
// A list of tags on each market. Any user can add tags to any market.
// This list also includes the predefined categories shown as filters on the home page.
tags: string[]
// Note: This url always points to https://manifold.markets, regardless of what instance the api is running on.
// This url includes the creator's username, but this doesn't need to be correct when constructing valid URLs.
// i.e. https://manifold.markets/Austin/test-market is the same as https://manifold.markets/foo/test-market
url: string
outcomeType: string // BINARY, FREE_RESPONSE, or NUMERIC
mechanism: string // dpm-2 or cpmm-1
probability: number
pool: { outcome: number } // For CPMM markets, the number of shares in the liquidity pool. For DPM markets, the amount of mana invested in each answer.
p?: number // CPMM markets only, probability constant in y^p * n^(1-p) = k
totalLiquidity?: number // CPMM markets only, the amount of mana deposited into the liquidity pool
volume: number
volume7Days: number
volume24Hours: number
isResolved: boolean
resolutionTime?: number
resolution?: string
resolutionProbability?: number // Used for BINARY markets resolved to MKT
lastUpdatedTime?: number
}
GET /v0/market/[marketId]
Gets information about a single market by ID. Includes comments, bets, and answers.
Requires no authorization.
Example request
https://manifold.markets/api/v0/market/3zspH9sSzMlbFQLn9GKR
Example response
{
"id": "lEoqtnDgJzft6apSKzYK",
"creatorUsername": "Angela",
"creatorName": "Angela",
"createdTime": 1655258914863,
"creatorAvatarUrl": "https://firebasestorage.googleapis.com/v0/b/mantic-markets.appspot.com/o/user-images%2FAngela%2F50463444807_edfd4598d6_o.jpeg?alt=media&token=ef44e13b-2e6c-4498-b9c4-8e38bdaf1476",
"closeTime": 1655265001448,
"question": "What is good?",
"description": "Resolves proportionally to the answer(s) which I find most compelling. (Obviously I’ll refrain from giving my own answers)\n\n(Please have at it with philosophy, ethics, etc etc)\n\n\nContract resolved automatically.",
"tags": [],
"url": "https://manifold.markets/Angela/what-is-good",
"pool": null,
"outcomeType": "FREE_RESPONSE",
"mechanism": "dpm-2",
"volume": 112,
"volume7Days": 212,
"volume24Hours": 0,
"isResolved": true,
"resolution": "MKT",
"resolutionTime": 1655265001448,
"answers": [
{
"createdTime": 1655258941573,
"avatarUrl": "https://firebasestorage.googleapis.com/v0/b/mantic-markets.appspot.com/o/user-images%2FAngela%2F50463444807_edfd4598d6_o.jpeg?alt=media&token=ef44e13b-2e6c-4498-b9c4-8e38bdaf1476",
"id": "1",
"username": "Angela",
"number": 1,
"name": "Angela",
"contractId": "lEoqtnDgJzft6apSKzYK",
"text": "ANTE",
"userId": "qe2QqIlOkeWsbljfeF3MsxpSJ9i2",
"probability": 0.66749733001068
},
{
"name": "Isaac King",
"username": "IsaacKing",
"text": "This answer",
"userId": "y1hb6k7txdZPV5mgyxPFApZ7nQl2",
"id": "2",
"number": 2,
"avatarUrl": "https://lh3.googleusercontent.com/a-/AOh14GhNVriOvxK2VUAmE-jvYZwC-XIymatzVirT0Bqb2g=s96-c",
"contractId": "lEoqtnDgJzft6apSKzYK",
"createdTime": 1655261198074,
"probability": 0.008922214311142757
},
{
"createdTime": 1655263226587,
"userId": "jbgplxty4kUKIa1MmgZk22byJq03",
"id": "3",
"avatarUrl": "https://firebasestorage.googleapis.com/v0/b/mantic-markets.appspot.com/o/user-images%2FMartin%2Fgiphy.gif?alt=media&token=422ef610-553f-47e3-bf6f-c0c5cc16c70a",
"text": "Toyota Camry",
"contractId": "lEoqtnDgJzft6apSKzYK",
"name": "Undox",
"username": "Undox",
"number": 3,
"probability": 0.008966714133143469
},
{
"number": 4,
"name": "James Grugett",
"userId": "5LZ4LgYuySdL1huCWe7bti02ghx2",
"text": "Utility (Defined by your personal utility function.)",
"createdTime": 1655264793224,
"contractId": "lEoqtnDgJzft6apSKzYK",
"username": "JamesGrugett",
"id": "4",
"avatarUrl": "https://lh3.googleusercontent.com/a-/AOh14GjC83uMe-fEfzd6QvxiK6ZqZdlMytuHxevgMYIkpAI=s96-c",
"probability": 0.09211463154147384
}
],
"comments": [
{
"id": "ZdHIyfQazHyl8nI0ENS7",
"userId": "qe2QqIlOkeWsbljfeF3MsxpSJ9i2",
"createdTime": 1655265807433,
"text": "ok what\ni did not resolve this intentionally",
"contractId": "lEoqtnDgJzft6apSKzYK",
"userName": "Angela",
"userAvatarUrl": "https://firebasestorage.googleapis.com/v0/b/mantic-markets.appspot.com/o/user-images%2FAngela%2F50463444807_edfd4598d6_o.jpeg?alt=media&token=ef44e13b-2e6c-4498-b9c4-8e38bdaf1476",
"userUsername": "Angela"
},
{
"userName": "James Grugett",
"userUsername": "JamesGrugett",
"id": "F7fvHGhTiFal8uTsUc9P",
"userAvatarUrl": "https://lh3.googleusercontent.com/a-/AOh14GjC83uMe-fEfzd6QvxiK6ZqZdlMytuHxevgMYIkpAI=s96-c",
"replyToCommentId": "ZdHIyfQazHyl8nI0ENS7",
"text": "@Angela Sorry! There was an error that automatically resolved several markets that were created in the last few hours.",
"createdTime": 1655266286514,
"userId": "5LZ4LgYuySdL1huCWe7bti02ghx2",
"contractId": "lEoqtnDgJzft6apSKzYK"
},
{
"userId": "qe2QqIlOkeWsbljfeF3MsxpSJ9i2",
"contractId": "lEoqtnDgJzft6apSKzYK",
"id": "PIHhXy5hLHSgW8uoUD0Q",
"userName": "Angela",
"text": "lmk if anyone lost manna from this situation and i'll try to fix it",
"userUsername": "Angela",
"createdTime": 1655277581308,
"userAvatarUrl": "https://firebasestorage.googleapis.com/v0/b/mantic-markets.appspot.com/o/user-images%2FAngela%2F50463444807_edfd4598d6_o.jpeg?alt=media&token=ef44e13b-2e6c-4498-b9c4-8e38bdaf1476"
},
{
"userAvatarUrl": "https://firebasestorage.googleapis.com/v0/b/mantic-markets.appspot.com/o/user-images%2FAngela%2F50463444807_edfd4598d6_o.jpeg?alt=media&token=ef44e13b-2e6c-4498-b9c4-8e38bdaf1476",
"userName": "Angela",
"text": "from my end it looks like no one did",
"replyToCommentId": "PIHhXy5hLHSgW8uoUD0Q",
"createdTime": 1655287149528,
"userUsername": "Angela",
"id": "5slnWEQWwm6dHjDi6oiH",
"contractId": "lEoqtnDgJzft6apSKzYK",
"userId": "qe2QqIlOkeWsbljfeF3MsxpSJ9i2"
}
],
"bets": [
{
"outcome": "0",
"contractId": "lEoqtnDgJzft6apSKzYK",
"fees": {
"liquidityFee": 0,
"creatorFee": 0,
"platformFee": 0
},
"isAnte": true,
"shares": 100,
"probAfter": 1,
"amount": 100,
"userId": "IPTOzEqrpkWmEzh6hwvAyY9PqFb2",
"createdTime": 1655258914863,
"probBefore": 0,
"id": "2jNZqnwoEQL7WDTTAWDP"
},
{
"shares": 173.20508075688772,
"fees": {
"platformFee": 0,
"liquidityFee": 0,
"creatorFee": 0
},
"contractId": "lEoqtnDgJzft6apSKzYK",
"probBefore": 0,
"createdTime": 1655258941573,
"loanAmount": 0,
"userId": "qe2QqIlOkeWsbljfeF3MsxpSJ9i2",
"amount": 100,
"outcome": "1",
"probAfter": 0.75,
"id": "xuc3JoiNkE8lXPh15mUb"
},
{
"userId": "y1hb6k7txdZPV5mgyxPFApZ7nQl2",
"contractId": "lEoqtnDgJzft6apSKzYK",
"loanAmount": 0,
"probAfter": 0.009925496893641248,
"id": "8TBlzPtOdO0q5BgSyRbi",
"createdTime": 1655261198074,
"shares": 20.024984394500787,
"amount": 1,
"outcome": "2",
"probBefore": 0,
"fees": {
"liquidityFee": 0,
"creatorFee": 0,
"platformFee": 0
}
},
{
"probAfter": 0.00987648269777473,
"outcome": "3",
"id": "9vdwes6s9QxbYZUBhHs4",
"createdTime": 1655263226587,
"shares": 20.074859899884732,
"amount": 1,
"loanAmount": 0,
"fees": {
"liquidityFee": 0,
"platformFee": 0,
"creatorFee": 0
},
"userId": "jbgplxty4kUKIa1MmgZk22byJq03",
"contractId": "lEoqtnDgJzft6apSKzYK",
"probBefore": 0
},
{
"createdTime": 1655264793224,
"fees": {
"creatorFee": 0,
"liquidityFee": 0,
"platformFee": 0
},
"probAfter": 0.09211463154147384,
"amount": 10,
"id": "BehiSGgk1wAkIWz1a8L4",
"userId": "5LZ4LgYuySdL1huCWe7bti02ghx2",
"contractId": "lEoqtnDgJzft6apSKzYK",
"loanAmount": 0,
"probBefore": 0,
"outcome": "4",
"shares": 64.34283176858165
}
]
}Response type: A
FullMarket
// A complete market, along with bets, comments, and answers (for free response markets)
type FullMarket = LiteMarket & {
bets: Bet[]
comments: Comment[]
answers?: Answer[]
description: JSONContent // Rich text content. See https://tiptap.dev/guide/output#option-1-json
textDescription: string // string description without formatting, images, or embeds
}
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
}
GET /v0/slug/[marketSlug]
Gets information about a single market by slug (the portion of the URL path after the username).
Requires no authorization.
- Example request
https://manifold.markets/api/v0/slug/will-carrick-flynn-win-the-general
- Response type: A
FullMarket
; same as above.
GET /v0/users
Lists all users.
Requires no authorization.
Example request
https://manifold.markets/api/v0/users
Example response
[
{
"id":"igi2zGXsfxYPgB0DJTXVJVmwCOr2",
"createdTime":1639011767273,
"name":"Austin",
"username":"Austin",
"url":"https://manifold.markets/Austin",
"avatarUrl":"https://lh3.googleusercontent.com/a-/AOh14GiZyl1lBehuBMGyJYJhZd-N-mstaUtgE4xdI22lLw=s96-c",
"bio":"I build Manifold! Always happy to chat; reach out on Discord or find a time on https://calendly.com/austinchen/manifold!",
"bannerUrl":"https://images.unsplash.com/photo-1501523460185-2aa5d2a0f981?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1531&q=80",
"website":"https://blog.austn.io",
"twitterHandle":"akrolsmir",
"discordHandle":"akrolsmir#4125",
"balance":9122.607163564959,
"totalDeposits":10339.004780544328,
"totalPnLCached":9376.601262721899,
"creatorVolumeCached":76078.46984199001
}Response type: Array of
LiteUser
// Basic information about a user
type LiteUser = {
id: string // user's unique id
createdTime: number
name: string // display name, may contain spaces
username: string // username, used in urls
url: string // link to user's profile
avatarUrl?: string
bio?: string
bannerUrl?: string
website?: string
twitterHandle?: string
discordHandle?: string
// Note: the following are here for convenience only and may be removed in the future.
balance: number
totalDeposits: number
totalPnLCached: number
creatorVolumeCached: number
}
POST /v0/bet
Places a new bet on behalf of the authorized user.
Parameters:
amount
: Required. The amount to bet, in M$, before fees.contractId
: Required. The ID of the contract (market) to bet on.outcome
: Required. The outcome to bet on. For binary markets, this isYES
orNO
. For free response markets, this is the ID of the free response answer. For numeric markets, this is a string representing the target bucket, and an additionalvalue
parameter is required which is a number representing the target value. (Bet on numeric markets at your own peril.)limitProb
: Optional. A number between0.001
and0.999
inclusive representing the limit probability for your bet (i.e. 0.1% to 99.9% — multiply by 100 for the probability percentage). The bet will execute immediately in the direction ofoutcome
, but not beyond this specified limit. If not all the bet is filled, the bet will remain as an open offer that can later be matched against an opposite direction bet.- For example, if the current market probability is
50%
:- A
M$10
bet onYES
withlimitProb=0.4
would not be filled until the market probability moves down to40%
and someone betsM$15
ofNO
to match your bet odds. - A
M$100
bet onYES
withlimitProb=0.6
would fill partially or completely depending on current unfilled limit bets and the AMM's liquidity. Any remaining portion of the bet not filled would remain to be matched against in the future.
- A
- An unfilled limit order bet can be cancelled using the cancel API.
- For example, if the current market probability is
Example request:
$ curl https://manifold.markets/api/v0/bet -X POST -H 'Content-Type: application/json' \
-H 'Authorization: Key {...}' \
--data-raw '{"amount":1, \
"outcome":"YES", \
"contractId":"{...}"}'
POST /v0/bet/cancel/[id]
Cancel the limit order of a bet with the specified id. If the bet was unfilled, it will be cancelled so that no other bets will match with it. This is action irreversable.
POST /v0/market
Creates a new market on behalf of the authorized user.
Parameters:
outcomeType
: Required. One ofBINARY
,FREE_RESPONSE
, orNUMERIC
.question
: Required. The headline question for the market.description
: Required. A long description describing the rules for the market.- Note: string descriptions do not turn into links, mentions, formatted text. Instead, rich text descriptions must be in TipTap json.
closeTime
: Required. The time at which the market will close, represented as milliseconds since the epoch.tags
: Optional. An array of string tags for the market.
For binary markets, you must also provide:
initialProb
: An initial probability for the market, between 1 and 99.
For numeric markets, you must also provide:
min
: The minimum value that the market may resolve to.max
: The maximum value that the market may resolve to.
Example request:
$ curl https://manifold.markets/api/v0/market -X POST -H 'Content-Type: application/json' \
-H 'Authorization: Key {...}'
--data-raw '{"outcomeType":"BINARY", \
"question":"Is there life on Mars?", \
"description":"I'm not going to type some long ass example description.", \
"closeTime":1700000000000, \
"initialProb":25}'
POST /v0/market/[marketId]/resolve
Resolves a market on behalf of the authorized user.
Parameters:
For binary markets:
outcome
: Required. One ofYES
,NO
,MKT
, orCANCEL
.probabilityInt
: Optional. The probability to use forMKT
resolution.
For free response markets:
outcome
: Required. One ofMKT
,CANCEL
, or anumber
indicating the answer index.resolutions
: An array of{ answer, pct }
objects to use as the weights for resolving in favor of multiple free response options. Can only be set withMKT
outcome.
For numeric markets:
outcome
: Required. One ofCANCEL
, or anumber
indicating the selected numeric bucket ID.value
: The value that the market may resolves to.
Example request:
# Resolve a binary market
$ curl https://manifold.markets/api/v0/market/{marketId}/resolve -X POST \
-H 'Content-Type: application/json' \
-H 'Authorization: Key {...}' \
--data-raw '{"outcome": "YES"}'
# Resolve a binary market with a specified probability
$ curl https://manifold.markets/api/v0/market/{marketId}/resolve -X POST \
-H 'Content-Type: application/json' \
-H 'Authorization: Key {...}' \
--data-raw '{"outcome": "MKT", \
"probabilityInt": 75}'
# Resolve a free response market with a single answer chosen
$ curl https://manifold.markets/api/v0/market/{marketId}/resolve -X POST \
-H 'Content-Type: application/json' \
-H 'Authorization: Key {...}' \
--data-raw '{"outcome": 2}'
# Resolve a free response market with multiple answers chosen
$ curl https://manifold.markets/api/v0/market/{marketId}/resolve -X POST \
-H 'Content-Type: application/json' \
-H 'Authorization: Key {...}' \
--data-raw '{"outcome": "MKT", \
"resolutions": [ \
{"answer": 0, "pct": 50}, \
{"answer": 2, "pct": 50} \
]}'
POST /v0/market/[marketId]/sell
Sells some quantity of shares in a binary market on behalf of the authorized user.
Parameters:
outcome
: Optional. One ofYES
, orNO
. If you leave it off, and you only own one kind of shares, you will sell that kind of shares.shares
: Optional. The amount of shares to sell of the outcome given above. If not provided, all the shares you own will be sold.
Example request:
$ curl https://manifold.markets/api/v0/market/{marketId}/sell -X POST \
-H 'Content-Type: application/json' \
-H 'Authorization: Key {...}' \
--data-raw '{"outcome": "YES", "shares": 10}'
GET /v0/bets
Gets a list of bets, ordered by creation date descending.
Parameters:
username
: Optional. If set, the response will include only bets created by this user.market
: Optional. The slug of a market. If set, the response will only include bets on this market.limit
: Optional. How many bets to return. The maximum and the default is 1000.before
: Optional. The ID of the bet before which the list will start. For example, if you ask for the most recent 10 bets, and then perform a second query for 10 more bets withbefore=[the id of the 10th bet]
, you will get bets 11 through 20.
Requires no authorization.
Example request
https://manifold.markets/api/v0/bets?username=ManifoldMarkets&market=will-i-be-able-to-place-a-limit-ord
Response type: A
Bet[]
.Example response
[
// Limit bet, partially filled.
{
"isFilled": false,
"amount": 15.596681605353808,
"userId": "IPTOzEqrpkWmEzh6hwvAyY9PqFb2",
"contractId": "Tz5dA01GkK5QKiQfZeDL",
"probBefore": 0.5730753474948571,
"isCancelled": false,
"outcome": "YES",
"fees": { "creatorFee": 0, "liquidityFee": 0, "platformFee": 0 },
"shares": 31.193363210707616,
"limitProb": 0.5,
"id": "yXB8lVbs86TKkhWA1FVi",
"loanAmount": 0,
"orderAmount": 100,
"probAfter": 0.5730753474948571,
"createdTime": 1659482775970,
"fills": [
{
"timestamp": 1659483249648,
"matchedBetId": "MfrMd5HTiGASDXzqibr7",
"amount": 15.596681605353808,
"shares": 31.193363210707616
}
]
},
// Normal bet (no limitProb specified).
{
"shares": 17.350459904608414,
"probBefore": 0.5304358279113885,
"isFilled": true,
"probAfter": 0.5730753474948571,
"userId": "IPTOzEqrpkWmEzh6hwvAyY9PqFb2",
"amount": 10,
"contractId": "Tz5dA01GkK5QKiQfZeDL",
"id": "1LPJHNz5oAX4K6YtJlP1",
"fees": {
"platformFee": 0,
"liquidityFee": 0,
"creatorFee": 0.4251333951457593
},
"isCancelled": false,
"loanAmount": 0,
"orderAmount": 10,
"fills": [
{
"amount": 10,
"matchedBetId": null,
"shares": 17.350459904608414,
"timestamp": 1659482757271
}
],
"createdTime": 1659482757271,
"outcome": "YES"
}
]
Changelog
- 2022-07-15: Add user by username and user by ID APIs
- 2022-06-08: Add paging to markets endpoint
- 2022-06-05: Add new authorized write endpoints
- 2022-02-28: Add
resolutionTime
to markets, changecloseTime
definition - 2022-02-19: Removed user IDs from bets
- 2022-02-17: Released our v0 API, with
/markets
,/market/[marketId]
, and/slug/[slugId]