Prediction Markets - Dialect Developer Documentation

Prediction markets allow users to bet on the outcomes of real-world events. Users can buy “Yes” or “No” outcome tokens with the price of these tokens reflecting the market’s collective belief about the likelihood of an event occurring. Our Markets API provides all the information you need to build prediction market interfaces, including:

basic protocol information,
market title and status,
bid/ask prices for Yes and No outcomes,
trading volume and open interest,
outcome tokens information,
timing information (open, close, expirationTime), etc.

By enriching the response with all of this information, it makes the API powerful enough to drive full-fledged dashboards and applications as well as smaller widgets, cards or notifications - All in a single API call!

Supported Protocols

Our Markets API currently supports prediction markets from DFlow, who are the official provider for Kalshi. If you want more information on the protocols that are supported or want to request more providers, please refer to the Supported Protocols Section page.

Understanding Events and Markets

Expiration image for Prediction Markets and Events

When working with prediction markets, it’s important to understand the distinction between events and markets:

Markets are the individual tradable outcomes within an event (e.g., “Democratic Party wins - Yes/No”, “Republican Party wins - Yes/No”)
Events are groupings of markets (e.g., “Which party will win control of the US House in 2026?”)

Markets

A single event typically has multiple markets. In our example the question “Which party will win control of the US House in 2026?” will create two markets:

Market for the Domocratic Party (Yes/No) and
Market for the Republican Party (Yes/No).

For crypto specifially, it is often the case that each market gets multiple token markets on top:

CASH market — For purchasing with Phantom’s stable coin
USDC market — For purchasing with USDC

Which means that the API will return 4 markets for this single event:

Event	Markets	Token
Control of the House 2026	Democratic Party (Yes/No)	USDC
	Democratic Party (Yes/No)	CASH
	Republican Party (Yes/No)	USDC
	Republican Party (Yes/No)	CASH

Events

The bundleId field is the key to grouping markets that belong to the same underlying event. All markets for the same question share the same bundleId, allowing you to:

Display related bets together in your UI
Create “position bundles” showing all positions for a single event
Build event-centric dashboards similar to Kalshi’s interface

Example: Grouping Political Markets

Our API will return you four markets for the “Control of the House 2026” event. In order to make it easier for your users, it is recommended to group these markets by their bundleId. The example bleow illustrates this concept for the CASH markets:

Multiple markets with same bundleId

// Market 1: Democratic Party (Cash)
{
  "id": "dflow.prediction.house-2026-dem-cash",
  "title": "Democratic Party will win control of US House",
  "bundleId": "house-control-2026",
  ...
}

// Market 2: Republican Party (Cash)
{
  "id": "dflow.prediction.house-2026-rep-cash",
  "title": "Republican Party will win control of US House",
  "bundleId": "house-control-2026",
  ...
}

All markets share the same bundleId: "house-control-2026", indicating they belong to the same underlying event.

To group markets by event in your application, filter or group the API response by the bundleId field. This recreates the “event” view from platforms like Kalshi.

Grouping Markets by Event

// Group markets by event using bundleId
const marketsByEvent = markets.reduce((acc, market) => {
  const eventId = market.bundleId;
  if (!acc[eventId]) acc[eventId] = [];
  acc[eventId].push(market);
  return acc;
}, {});

Data Structure

Below is an example of a prediction market response from the Markets API. Based on customer demand, we may add more fields to the response in the future. For the latest data structure, please have a look at our Markets API Reference page.

Please note that we do our best to design our APIs to be non-breaking. It is recommended to filter the response and only include the fields / types you need to ensure it won’t break your application if new fields are added over time.

Prediction Markets Data Structure

{
  "id": "string",                    // Unique market identifier
  "type": "prediction",              // Market type
  "provider": {
    "id": "string",                  // Protocol identifier
    "name": "string",                // Protocol display name
    "icon": "string"                 // Protocol icon URL
  },
  "title": "string",                 // Market question/title
  "subtitle": "string",              // Additional context (optional)
  "status": "open|closed|settled",   // Market status
  "result": "string",                // Outcome result (when settled)
  "volume": number,                  // Total trading volume (USD)
  "openInterest": number,            // Open interest (USD)
  "yesBid": number,                  // Best bid price for Yes outcome
  "yesAsk": number,                  // Best ask price for Yes outcome
  "noBid": number,                   // Best bid price for No outcome
  "noAsk": number,                   // Best ask price for No outcome
  "openTime": number,                // Unix timestamp when market opened
  "closeTime": number,               // Unix timestamp when trading closes
  "expirationTime": number,          // Unix timestamp when market expires
  "yesToken": {                      // Yes outcome token
    "address": "string",             // Token mint address
    "symbol": "string",              // Token symbol
    "decimals": number,              // Token decimals
    "icon": "string",                // Token icon URL
    "name": "string"                 // Token name
  },
  "noToken": {                       // No outcome token
    "address": "string",             // Token mint address
    "symbol": "string",              // Token symbol
    "decimals": number,              // Token decimals
    "icon": "string",                // Token icon URL
    "name": "string"                 // Token name
  },
  "websiteUrl": "string",            // Direct link to market on protocol
  "bundleId": "string",              // Groups markets from the same event
  "additionalData": {}               // Protocol-specific metadata
}

Practical Example

In order to better understand how the API works, let’s walk through an example response for a DFlow prediction market. This example shows a political prediction market for control of the U.S. House:

API Response for DFlow Prediction Market

{
  "id": "dflow.prediction.CONTROLH-2026.G7EqT9zdoRKt5RScDhpKjryEnT2SVjAViBJb34smb6SH",
  "type": "prediction",
  "provider": {
    "id": "dflow",
    "name": "DFlow",
    "icon": "https://imagedelivery.net/C7jfNnfrjpAYWW6YevrFDg/d5d0e3f9-72f3-4a19-a415-6994f32c1f00/public"
  },
  "title": "Will Republicans win the House in 2026?",
  "subtitle": "",
  "status": "open",
  "volume": 1858086,
  "openInterest": 1113892,
  "yesBid": 0.23,
  "yesAsk": 0.24,
  "noBid": 0.76,
  "noAsk": 0.77,
  "openTime": 1730905200,
  "closeTime": 1801494000,
  "expirationTime": 1801494000,
  "yesToken": {
    "address": "7Ady9N19XAAcqPLWwSe7ngPbxegMgvEQd55V4bR4jN2z",
    "symbol": "DFlowYU0114",
    "decimals": 6,
    "icon": "https://kalshi-public-docs.s3.amazonaws.com/series-images-webp/CONTROLH.webp",
    "name": "Yes Republican Party"
  },
  "noToken": {
    "address": "8XctSiRJZhLA6QaB3p61iZwE1PCTQbbhFaDSEufkwzDQ",
    "symbol": "DFlowNU0114",
    "decimals": 6,
    "icon": "https://kalshi-public-docs.s3.amazonaws.com/series-images-webp/CONTROLH.webp",
    "name": "No Republican Party"
  },
  "bundleId": "dflow.prediction.CONTROLH-2026",
  "additionalData": {
    "ticker": "CONTROLH-2026-R",
    "eventTicker": "CONTROLH-2026",
    "marketLedger": "G7EqT9zdoRKt5RScDhpKjryEnT2SVjAViBJb34smb6SH",
    "purchaseToken": {
      "icon": "https://raw.githubusercontent.com/solana-labs/token-list/main/assets/mainnet/EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v/logo.png",
      "symbol": "USDC",
      "address": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "decimals": 6
    },
    "redemptionStatus": "pending"
  }
}

Understanding the Response

What you can see here is the original response from the API. As mentioned in the introduction section, this response is powerful enough to drive full-fledged dashboards and applications. Let’s break it down into its components:

Market Identity:
- id: Unique identifier combining protocol, market type, and market slug
- type: Market category (always prediction for prediction markets)
- provider: Protocol information for branding in your UI
- title: The market question users are betting on
- subtitle: Additional context about the market (optional)
- websiteUrl: Direct link to the market on the protocol’s website
Market Status:
- status: Current state of the market
  - open — Market is active and accepting trades
  - closed — Trading has ended, awaiting settlement
  - settled — Outcome has been determined and payouts processed
- result: The final outcome (only present when settled)
Pricing (Implied Probabilities):
- yesBid (0.23) / yesAsk (0.24) — Bid/ask prices for Yes tokens, implying ~23-24% probability
- noBid (0.76) / noAsk (0.77) — Bid/ask prices for No tokens, implying ~76-77% probability
Note: Prices represent implied probabilities. A Yes price of 0.23 means the market implies a 23% chance of the outcome occurring.
Market Metrics:
- volume ($1.86M) — Total trading volume in USD
- openInterest ($1.11M) — Total value of outstanding positions
Timing:
- openTime — When the market opened for trading (Unix timestamp)
- closeTime — When trading will close (Unix timestamp)
- expirationTime — When the market will be settled (Unix timestamp)
Outcome Tokens:
- yesToken / noToken — Token information for each outcome, including mint addresses for on-chain interaction
Bundle ID:
- bundleId (“dflow.prediction.CONTROLH-2026”) — Groups markets belonging to the same underlying event. All markets with the same bundleId are related (e.g., different party outcomes for the same election, or the same market with different purchase tokens).
Additional Data: The additionalData object contains protocol-specific metadata. See Protocol-Specific Additional Data for details.

Filtering Prediction Markets

If you are only interested in specific prediction markets, you can use the filters parameter to refine your API requests.

Filters only work for prediction market type. Make sure to set this type before sending your request.

As of now, we support filtering by the following status values:

open
closed
settled

Examples:

Open only: {"prediction":{"status":["open"]}}
Exclude settled: {"prediction":{"status":["open","closed"]}}

If you need more filter options, please reach out to us.

Tracking Prediction Positions

Our Positions API and PnL API give you everything you need to track a user’s prediction market activity. Without them, tracking DFlow positions requires multiple steps:

Fetch all token accounts for a wallet
Get tokenized account mints
Use DFlow’s endpoint to filter outcome token mints
Fetch market details for those mints

The Positions API simplifies this to a single call.

Fetching Positions

Our Positions API is designed to return you all positions for a given wallet address. Then you can add the type=prediction parameter to filter the positions by market type.

const response = await fetch(
  'https://markets.dial.to/api/v0/positions/owners?walletAddresses=YOUR_WALLET&type=prediction',
  {
    headers: {
      'x-dialect-api-key': 'YOUR_API_KEY'
    }
  }
);

const data = await response.json();
console.log(data.positions);

Grouping Positions by Event

Use the bundleId field to group a user’s positions that belong to the same underlying event:

Grouping Positions by Event

// Group positions by event using bundleId
const positionsByEvent = positions.reduce((acc, position) => {
  const eventId = position.bundleId;
  if (!acc[eventId]) acc[eventId] = [];
  acc[eventId].push(position);
  return acc;
}, {});

Filtering for Active Positions

By default, the Positions API returns all positions. To get only positions in markets that are still actively trading, filter by market.status:

Filtering for Active Positions

// Filter for positions in open markets only
const activePositions = positions.filter(
  (position) => position.market.status === "open",
);

The market.status field indicates the current state of the market:

Status	Description
`open`	Market is active and accepting trades
`closed`	Trading has ended, awaiting settlement
`settled`	Outcome has been determined, position may be redeemable

Server-side filtering for positions by status is coming soon via the filters parameter. For now, use client-side filtering as shown above.

If you need more filtering options, please reach out to us.

Cost Basis

The Positions API includes cost basis data for prediction market positions, giving you insight into a user’s average entry price and total capital committed to a position. It answers the question: “How much did I spend to acquire the tokens I currently hold?” Cost basis is calculated using the average cost method, which is the same approach used by traditional brokerages.

Response Fields

The following fields are included on each prediction position:

Field	Type	Description
`costBasisTotal`	`number`	Total capital committed to the position (sum of all buys at their prices)
`costBasisAvg`	`number`	Average price paid per token (total cost basis divided by current quantity)

Example Response

Here is an example of a prediction position response that includes cost basis data:

Prediction Position with Cost Basis

{
  "id": "dflow.prediction.KXNCAAMBGAME-26FEB13MASSAKR.GKmqm1hCPznFXK3Qku7y6PT2aDutRHiENvgT5mkkYzKf.yes.6JpNV6DK88auwzKVizdeT4Bw3D44sam5GqjcPCJ7y176",
  "type": "prediction",
  "ownerAddress": "6JpNV6DK88auwzKVizdeT4Bw3D44sam5GqjcPCJ7y176",
  "bundleId": "dflow.prediction.KXNCAAMBGAME-26FEB13MASSAKR",
  "marketId": "dflow.prediction.KXNCAAMBGAME-26FEB13MASSAKR.GKmqm1hCPznFXK3Qku7y6PT2aDutRHiENvgT5mkkYzKf",
  "token": {
    "address": "G5ntr63hgHAhJjNkJgfumexUDpVbz2z8FaoqRhnMxe9w",
    "symbol": "DFlowYC66dc",
    "decimals": 6,
    "icon": "https://kalshi-public-docs.s3.amazonaws.com/series-images-webp/KXNCAAMBGAME.webp",
    "name": "Yes Akron"
  },
  "side": "yes",
  "amount": 2,
  "amountUsd": 2,
  "costBasisTotal": 1.772609,
  "costBasisAvg": 0.8863045,
  "additionalData": {},
  "market": {
    // more market data
  }
}

In this example:

The user holds 2 “Yes Akron” tokens (amount: 2) worth $2.00 (amountUsd: 2)
Their total capital committed is $1.77 (costBasisTotal: 1.772609)
Their average entry price is $0.89 per token (costBasisAvg: 0.8863045)
Since the market settled as “yes” and each token pays out $1.00, this position is profitable

How Cost Basis is Calculated

Cost basis tracks two values per position: the total capital (costBasisTotal) committed and the average price per token (costBasisAvg). These values evolve with every trade event:

	Buy	Sell	Full Exit
Amount	+ buy amount	- sell amount	Resets to 0
Total Cost Basis	+ buy amount × buy price	- sell amount × current avg cost	Resets to 0
Avg Cost Basis	Recomputed (total / amount)	Unchanged	Resets to null

Note that the sell price does not affect cost basis. Sells are treated purely as inventory reductions at average cost. When quantity reaches zero (full exit), any subsequent buys are treated as a new position with no historical carryover. Transfers Besides trades, positions can also change through token transfers. Here is how transfers affect cost basis:

Inbound transfers are treated as buy events at the current average cost basis. If no position exists yet (i.e., the transfer is the first event for this wallet), the current market price is used instead.
Outbound transfers are treated as sell events, reducing both quantity and total cost basis.

Example Here is a step-by-step example showing how cost basis evolves across multiple trades:

Event	Quantity	Total Cost Basis	Avg Cost Basis
Buy 100 @ $0.25	100	$25.00	$0.25
Buy 50 @ $0.40	150	$45.00	$0.30
Sell 50 @ $0.50	100	$30.00	$0.30
Sell 100 (full exit)	0	$0.00	null
Buy 200 @ $0.60	200	$120.00	$0.60

Notice that after the full exit, the new buy starts fresh with no carryover from the previous trading episode.

PnL

PnL allows the user to see how their positions are performing. It answers the question: “Am I profitable or am I loosing money?” The Positions API returns PnL for active positions only. Once a user fully redeems their outcome tokens, the position is closed and no longer returned. Use the PnL API to access PnL across all positions, including closed ones.

Response Fields

Each prediction position includes a pnl object containing the following fields:

Field	Type	Description
`unrealized`	`number`	Current gain or loss on shares still held
`unrealizedPct`	`number`	Unrealized PnL as a percentage
`realized`	`number`	Profit or loss locked in from shares already sold
`total`	`number`	Combined PnL for the current position
`totalLifetime`	`number`	Cumulative total PnL including already closed positions
`realizedLifetime`	`number`	Cumulative realized PnL including fully closed positions

total and totalLifetime differ when a user has fully exited and re-entered a position. total reflects the current open position only, while totalLifetime carries forward gains and losses from previous closed episodes.

Example Response

Prediction Position with PnL

{
  "id": "dflow.prediction.KXFEDCHAIRNOM-29.6Ryen6J3RETCd4oqaViA6QsPxvxSPjLYxcPDLHa7qK19.yes.6JpNV6DK88auwzKVizdeT4Bw3D44sam5GqjcPCJ7y176",
  "type": "prediction",
  "ownerAddress": "6JpNV6DK88auwzKVizdeT4Bw3D44sam5GqjcPCJ7y176",
  "bundleId": "dflow.prediction.KXFEDCHAIRNOM-29",
  "marketId": "dflow.prediction.KXFEDCHAIRNOM-29.6Ryen6J3RETCd4oqaViA6QsPxvxSPjLYxcPDLHa7qK19",
  "side": "yes",
  "amount": 1,
  "amountUsd": 1,
  "costBasisTotal": 0.95,
  "costBasisAvg": 0.95,
  "pnl": {
    "unrealized": 0.05,
    "unrealizedPct": 0.0494,
    "realized": 0,
    "total": 0.05,
    "realizedLifetime": 0,
    "totalLifetime": 0.05,
    "capital": {
      "invested": 0.95,
      "investedLifetime": 0.95,
      "netFlow": -0.95,
      "netFlowLifetime": -0.95
    }
  },
  "market": {
    // market data
  }
}

In this example:

The user holds 1 Yes token currently worth $1.00 (amountUsd)
Their cost basis is $0.95 (costBasisTotal), reflecting the buying price of the token
No shares have been sold yet, so:
- realized PnL is $0 and
- unrealized PnL is +$0.05 (current value minus cost basis)
- total is +$0.05

Unrealized PnL is calculated using the bid-side price of the outcome token, which represents what a user would actually receive if they sold their position today.

Capital

The capital object is available in the PnL API and nested inside the pnl object in the Positions API. It answers the question: “Have I broken even yet, and how much of my own money is still at stake?” Unlike PnL, capital values are price-agnostic, which means they only change when a buy or sell event happens, not when the market moves. This makes the capital object a stable measure of your capital commitment to a position.

How it differs from PnL and Cost Basis

Metric	Changes on price move?	Changes on buy?	Changes on sell?
`pnl.unrealized`	Yes	Yes	Yes
`costBasisTotal`	No	Yes	Yes (adjusted down)
`capital.invested`	No	Yes (increases)	No
`capital.netFlow`	No	Yes (decreases)	Yes (increases)

Response Fields

Field	Type	Description
`capital.invested`	`number`	Sum of all buy costs for the active position. Increases with every buy, never decreases.
`capital.investedLifetime`	`number`	Sum of all buy costs across all re-entries for this market.
`capital.netFlow`	`number`	Net capital flow for the active position: money out vs. money in. See below for interpretation.
`capital.netFlowLifetime`	`number`	Net capital flow across all re-entries for this market.

Example Response

Position with Capital Object (from PnL API)

{
  "positionId": "dflow.prediction.KXFEDCHAIRNOM-29.6Ryen6J3RETCd4oqaViA6QsPxvxSPjLYxcPDLHa7qK19.yes.6JpNV6DK88auwzKVizdeT4Bw3D44sam5GqjcPCJ7y176",
  "marketId": "dflow.prediction.KXFEDCHAIRNOM-29.6Ryen6J3RETCd4oqaViA6QsPxvxSPjLYxcPDLHa7qK19",
  "ownerAddress": "6JpNV6DK88auwzKVizdeT4Bw3D44sam5GqjcPCJ7y176",
  "total": 0.05,
  "realized": 0,
  "unrealized": 0.05,
  "capital": {
    "invested": 0.95,
    "investedLifetime": 0.95,
    "netFlow": -0.95,
    "netFlowLifetime": -0.95
  },
  "realizedLifetime": 0,
  "totalLifetime": 0.05
}

Understanding netFlow

netFlow is calculated as total sells minus total buys. It tracks whether you’ve gotten your money back through sales.

netFlow value	What it means
Negative	Your own capital is still locked in the position. You haven’t sold enough to cover what you put in.
Zero	Breakeven. Your initial investment has been fully returned through sells.
Positive	You’ve earned back what you put in. The remaining amount is additional realized returns.

netFlow is unaffected by price changes. It only moves when you execute a trade:

Buy → netFlow decreases (more of your capital is committed)
Sell → netFlow increases (capital is returned to you)

Example

Here is a step-by-step example showing how invested and netFlow evolve across multiple trades, assuming an initial buy of $100:

Event	invested	netFlow	Interpretation
Buy $100	$100	-$100	All capital locked in position
Buy $100 more	$200	-$200	More capital committed (DCA)
Sell for $75	$200	-$125	Still $125 of own capital in position
Sell for $125	$200	$0	Breakeven — initial investment fully regained
Sell for $50	$200	+$50	$50 above initial investment — pure realized profit

Note that invested only increases with buys, regardless of how much was sold. It represents the cumulative capital committed to the position, not the current exposure. Use capital.netFlow to show users how far they are from breakeven. A value of 0 means they’ve gotten their money back through sells. Anything above 0 is pure realized profit.

Protocol-Specific Additional Data

The additionalData field contains DFlow-specific metadata that may be useful for advanced integrations:

DFlow Additional Data

{
  "additionalData": {
    "ticker": "CONTROLH-2026-R",
    "eventTicker": "CONTROLH-2026",
    "marketLedger": "G7EqT9zdoRKt5RScDhpKjryEnT2SVjAViBJb34smb6SH",
    "purchaseToken": {
      "icon": "https://...",
      "symbol": "USDC",
      "address": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "decimals": 6
    },
    "redemptionStatus": "pending"
  }
}

Field	Description
`ticker`	Kalshi’s / DFlow’s specific market identifier (e.g., “CONTROLH-2026-R” for Republicans)
`eventTicker`	Event-level identifier — all markets in the same event share this ticker
`marketLedger`	On-chain address of the market ledger that handles positions and redemptions
`purchaseToken`	The token used to purchase outcome tokens (USDC or CASH)
`redemptionStatus`	Current redemption state: `open` or `pending`

The eventTicker in additionalData corresponds conceptually to the bundleId field. Both can be used to identify markets that belong together.

Take action in a market

We are currently not supporting Blinks for prediction markets. If you want to request this feature, please reach out to us via our contact form. If you still want to support actions, please checkout DFlow’s documentation.

GETTING STARTED

Markets

Positions

​Supported Protocols

​Understanding Events and Markets

​Markets

​Events

​Example: Grouping Political Markets

​Data Structure

​Practical Example

​Understanding the Response

​Filtering Prediction Markets

​Tracking Prediction Positions

​Fetching Positions

​Grouping Positions by Event

​Filtering for Active Positions

​Cost Basis

​Response Fields

​Example Response

​How Cost Basis is Calculated

​PnL

​Response Fields

​Example Response

​Capital

​How it differs from PnL and Cost Basis

​Response Fields

​Example Response

​Understanding netFlow

​Example

​Protocol-Specific Additional Data

​Take action in a market

Supported Protocols

Understanding Events and Markets

Markets

Events

Example: Grouping Political Markets

Data Structure

Practical Example

Understanding the Response

Filtering Prediction Markets

Tracking Prediction Positions

Fetching Positions

Grouping Positions by Event

Filtering for Active Positions

Cost Basis

Response Fields

Example Response

How Cost Basis is Calculated

PnL

Response Fields

Example Response

Capital

How it differs from PnL and Cost Basis

Response Fields

Example Response

Understanding netFlow

Example

Protocol-Specific Additional Data

Take action in a market