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Prediction markets with a public API

Platforms that publish an API for market data, trading or both — for a bot, a dashboard or a model — ranked by Editor Score. Whether a platform has one is read from its own developer documentation. Access rules, rate limits and whether trading by API needs a verified account differ by venue; each review links the documentation we read.

Updated

Ranked platforms

  1. Kalshi

    7.7/10preliminary
    Regulated✅ Available

    KalshiEX is a CFTC-designated contract market and its Member Agreement names no US state as restricted. State court orders block some contract categories in Nevada, Washington and Michigan; elsewhere its contracts are available. Kalshi is in litigation with about 20 states, so this can change quickly.

    Visit site →Read review

  2. Novig

    6.4/10preliminary
    Regulated✅ Available

    “Novig is available nationwide, except in Arizona, Nevada, and Michigan.” Eligibility is based on physical location at the time of trading, and users must be 21 or older.

    Read review

  3. Alpha Arcade

    5.1/10preliminary
    Crypto✅ Available

    Not on Alpha Arcade’s list of restricted jurisdictions. Absence from the list does not by itself establish that an individual may use the platform.

    Read review

  4. Manifold Markets

    3.7/10preliminary
    Play money✅ Available

    Play-money mana trading is open to users 13+ (minors need a guardian). Outside the listed states, US residents aged 18+ can also enter prize drawings.

    Visit site →Read review

  5. Delphi

    3.5/10preliminary
    Crypto✅ Available

    Not on Delphi’s list of restricted jurisdictions. Absence from the list does not by itself establish that an individual may use the platform.

    Read review

  6. Polymarket US

    7.3/10preliminary
    Regulated⚠️ Restrictions

    QCX LLC publishes no list of eligible or excluded states. A Nevada court granted a preliminary injunction against QCX LLC d/b/a Polymarket US on 29 May 2026 (Nevada Gaming Control Board). Missouri's Attorney General has sent a cease-and-desist over sports contracts, and New York has announced a lawsuit; neither state is marked closed because the operator has not said it geoblocks them.

    Read review

  7. Polymarket

    6.9/10preliminary
    Crypto⚠️ Restrictions

    The international polymarket.com site is closed to US residents: no deposits and no trades. The help centre lists the US as blocked and the API docs list it as close-only. US residents are sent to the separate Polymarket US app, run by QCX LLC (a CFTC DCM). Polymarket US state-level eligibility was not verified because its ToS page loads its text client-side.

    Visit site →Read review

  8. ProphetX

    6.0/10preliminary
    Regulated⚠️ Restrictions

    ProphetX says it is “available nationwide” but publishes no excluded-state list; its help centre says access “is restricted from certain locations and IP addresses”. Connecticut reportedly ordered it to stop offering sports contracts to residents (September 2026); the order could not be read on the regulator’s site.

    Read review

  9. Futuur

    5.2/10preliminary
    Custodial⚠️ Restrictions

    Listed in the Terms (updated 24 Jan 2025) among countries whose residents may not use Real-Money Services. Play-money (Ooms) markets stay open, and the app tells users from Restricted Jurisdictions they can still bet play money.

    Visit site →Read review

  10. ParamX

    4.4/10preliminary
    CryptoAvailability unverified
    Read review

  11. Precog Markets

    4.2/10preliminary
    CryptoAvailability unverified
    Read review

  12. Seer

    3.9/10preliminary
    CryptoAvailability unverified
    Read review

  13. STRATO Odds

    3.8/10preliminary
    CryptoAvailability unverified
    Read review

  14. Worm

    3.3/10preliminary
    CryptoAvailability unverified
    Read review

  15. Predict.fun

    5.4/10preliminary
    Crypto❌ Unavailable

    USA named as a restricted jurisdiction; trading not permitted, content features only. Terms of Service last updated November 18, 2025.

    Visit site →Read review

  16. Pascal

    5.3/10preliminary
    Crypto❌ Unavailable

    Listed as a restricted jurisdiction in Pascal’s terms.

    Read review

  17. Myriad Markets

    5.0/10preliminary
    Crypto❌ Unavailable

    United States of America is a Prohibited Territory; trading in Supported Contracts not permitted. Terms of Use updated January 13, 2026, section 2 Prohibited Territories.

    Visit site →Read review

  18. Limitless Exchange

    4.5/10preliminary
    Crypto❌ Unavailable

    Platform is not available for trading to users from the USA. Terms of Service last updated September 15, 2026, section 1 Eligibility.

    Visit site →Read review

  19. SX Bet

    4.4/10preliminary
    Crypto❌ Unavailable

    Listed as a restricted jurisdiction in SX Bet’s terms.

    Read review

  20. PRED

    4.3/10preliminary
    Crypto❌ Unavailable

    Listed as a restricted jurisdiction in PRED’s terms.

    Read review

  21. Overtime

    4.2/10preliminary
    Crypto❌ Unavailable

    Listed as a restricted jurisdiction in Overtime’s terms.

    Read review

  22. Hermes Trade

    3.7/10preliminary
    Crypto❌ Unavailable

    Listed as a restricted jurisdiction in Hermes Trade’s terms.

    Read review

  23. Hyperliquid

    3.6/10preliminary
    Crypto❌ Unavailable

    Terms (updated 15 Jun 2026) s.1.6 treats US residents, US-located persons and US entities as Restricted Persons barred from the whole interface, including HIP-4 outcome markets.

    Visit site →Read review

  24. Prophet Prediction Market

    3.5/10preliminary
    Crypto❌ Unavailable

    Listed as a restricted jurisdiction in Prophet Prediction Market’s terms.

    Read review

  25. Azuro

    3.0/10preliminary
    Crypto❌ Unavailable

    Listed as a restricted jurisdiction in Azuro’s terms.

    Read review

Every platform reviewed

1. Kalshi

CFTC-regulated event contract exchange

7.7Prelim

Strengths

  • CFTC-designated contract market
  • Fiat deposits and withdrawals, no wallet needed
  • Default maker fee is zero, with charged series exceptions
  • Mobile apps on both platforms

Watch out

  • Country restrictions and account approval apply to international users
  • Narrower market selection than on-chain venues
  • KYC required before you can trade
  • Trading fees vary by contract price and series
$10
Min deposit
Taker 0.07·P·(1−P) — 1.75¢ at 50¢
Fees
7
Markets
2021
Since
Go to Kalshi →Full review

2. Novig

CFTC-designated peer-to-peer sports prediction market (Ludlow)

6.4Prelim

0% maker · taker fee on live and futures
Fees
1
Markets
2024
Since
AvailableFull review

3. Alpha Arcade

Algorand order-book prediction market for sports, politics and crypto

5.1Prelim

Taker 0.07×p×(1−p); maker 0
Fees
7
Markets
AvailableFull review

4. Manifold Markets

Play-money forecasting community

3.7Prelim

Strengths

  • No money at risk — play currency only
  • Anyone can create a market
  • Open API and public leaderboard
  • No KYC and no deposit needed

Watch out

  • Prices are not backed by capital, so they forecast less reliably
  • Market quality varies widely
  • No cash withdrawal
  • No mobile apps
$0
Min deposit
Mana only · no per-trade fee stated
Fees
4
Markets
2021
Since
Go to Manifold Markets →Full review

5. Delphi

User-created USDC markets on Gensyn with AI-run automated settlement

3.5Prelim

Creator-set, default 2% per trade
Fees
6
Markets
AvailableFull review

6. Polymarket US

CFTC-regulated US event-contract exchange run by QCX LLC, USD only

7.3Prelim

Taker ≤$1.74 per 100 at 50¢ · maker rebate
Fees
7
Markets
RestrictedFull review

7. Polymarket

Largest on-chain prediction market by volume

6.9Prelim

Strengths

  • Deepest liquidity in the category on major markets
  • Fastest listing of new events
  • No maker trading fees under the published schedule
  • Public API with full order book access

Watch out

  • Requires a wallet and USDC — no fiat rails
  • International product has country restrictions; Polymarket US is separate
  • Thin depth on long-tail markets
  • Network fees apply to deposits and withdrawals
$2
Min deposit
0% maker · taker by category and price
Fees
7
Markets
2020
Since
Go to Polymarket →Full review

8. ProphetX

CFTC-designated sports-first exchange, peer-to-peer order book

6.0Prelim

$10
Min deposit
2% of net gains per market
Fees
2
Markets
2026
Since
RestrictedFull review

9. Futuur

Runs a play-money currency and real-money currencies side by side

5.2Prelim

Strengths

  • Markets name a Primary Designated Source with a Secondary Confirmation Mechanism fallback
  • Full rules render in a market page fetched with no account
  • An unresolvable market is voided with stakes returned rather than settled on a guess
  • 208,358 resolved events are readable over the public API, so the settlement record is inspectable at scale

Watch out

  • The terms state twice that Futuur has “sole discretion” over determinations and that they are “final and binding”
  • No dispute window, bond or escalation anywhere; the route offered is email
  • The API carries a first-class “reversed” status, so undoing a settlement is a designed capability
  • The terms page carries two copies naming different companies — Anjouan and Curaçao — under two governing laws
  • Play-money and real-money markets run side by side and must never be read as one book
  • Custody is with the operator; the duplicated terms leave the contracting entity unresolved
Taker 0.05·P·(1−P) · maker 0%, 80% rebate
Fees
Go to Futuur →Full review

10. ParamX

Sui exchange for $1 touch contracts on crypto, stocks and futures

4.4Prelim

0.30% taker, 0% maker
Fees
2
Markets
Availability unverifiedFull review

11. Precog Markets

Open-source LS-LMSR prediction markets on Base and Arbitrum

4.2Prelim

No buy fee; market-set sell fee
Fees
6
Markets
Availability unverifiedFull review

12. Seer

Permissionless markets on Gnosis/Ethereum via Reality.eth and Kleros

3.9Prelim

4
Markets
Availability unverifiedFull review

13. STRATO Odds

Hourly/daily YES/NO price markets on gold, silver, crypto and stocks

3.8Prelim

2% taker, 0% maker, 0.01 USDST/tx
Fees
2
Markets
Availability unverifiedFull review

14. Worm

AI-assisted prediction markets on Solana with 1x–3x leverage

3.3Prelim

3
Markets
Availability unverifiedFull review

15. Predict.fun

Non-custodial event contracts on BNB Chain, with yield on USDT collateral

5.4Prelim

Strengths

  • Non-custodial: the venue never holds your balance
  • Zero maker fee, so posting liquidity costs only the spread you offer
  • Yield paid on USDT collateral while it sits against an open position — unique among the venues we cover
  • Six of the seven categories we track, the widest verified breadth of any venue we built from primary sources
  • Names its operating entity, which most on-chain venues do not

Watch out

  • Its own documentation describes two incompatible resolution mechanisms, both live on the same day
  • The developer page for the deployed oracle states “No bonding or dispute mechanism (simplified trust model)”
  • Admins can flag questions for emergency resolution, documented in developer pages rather than in the user terms
  • A role holder can settle Chainlink market rounds manually
  • No licence, no regulator, and no stated jurisdiction of incorporation
0% maker · taker by price
Fees
6
Markets
Go to Predict.fun →Full review

16. Pascal

Non-custodial order-book prediction exchange on Solana

5.3Prelim

Taker 2% x p x (1-p); makers get 25%
Fees
5
Markets
UnavailableFull review

17. Myriad Markets

On-chain prediction markets settled in USD1 on BNB Smart Chain, and USDC.e on Abstract

5.0Prelim

Strengths

  • A three-dollar minimum, among the lowest barriers to entry we list
  • Zero maker fee
  • Per-market rules are published, so you can read what a contract turns on before trading
  • Settlement in USD1 or USDC.e, across crypto, politics, economy and sports

Watch out

  • The entire documented settlement process is one sentence: the team resolves
  • No oracle, no challenge window, no bond and no escalation anywhere in nineteen documentation pages
  • The only route offered to anyone disputing a settlement is a support ticket to the party that made it
  • The deployed contract carries an admin function that writes outcomes directly without calling an oracle
  • Myriad’s own commissioned audit says role holders have “control over which side wins”
  • The terms of use disclose no such role and reserve no such discretion
$3
Min deposit
0% maker · taker by price
Fees
4
Markets
Go to Myriad Markets →Full review

18. Limitless Exchange

Order-book and AMM event markets on Base, fully collateralised in USDC

4.5Prelim

Strengths

  • Every YES + NO pair is fully collateralised by $1.00 USDC, so the money to pay the winner is locked at creation
  • Names its operator: Street Chow Inc., a Panamanian company, in terms dated 19 June 2026
  • Full market criteria are served to an unauthenticated API request
  • Publishes its refund policy plainly, which several venues in this pool do not

Watch out

  • The CFTC register entry reads Pending, not Designated — an application confers nothing
  • Settlement is centralised: Pyth resolves most markets, the Limitless team resolves the rest
  • No challenge window, no bond and no escalation; the documented remedy is an email
  • A misresolved market refunds only your stake, while the wrong side keeps its winnings
  • No licence or registration stated anywhere in its own documentation
AMM 0.40% · order-book taker varies
Fees
5
Markets
Go to Limitless Exchange →Full review

19. SX Bet

Peer-to-peer sports betting exchange in USDC on SX Network

4.4Prelim

1% of net profit on taker bets · maker 0%
Fees
1
Markets
UnavailableFull review

20. PRED

On-chain sports prediction exchange (CLOB) on Base, USDC

4.3Prelim

Taker ≤2.5%×(1−p); makers 0%
Fees
1
Markets
UnavailableFull review

21. Overtime

On-chain AMM sportsbook on Optimism, Arbitrum and Base

4.2Prelim

2% protocol fee built into odds
Fees
2
Markets
UnavailableFull review

22. Hermes Trade

CLOB prediction market on Monad with gasless smart-wallet trading

3.7Prelim

Taker fee (bps, via API); makers 0%
Fees
2
Markets
UnavailableFull review

23. Hyperliquid

Perpetuals venue whose HIP-4 outcome markets are fully collateralised binary contracts

3.6Prelim

Strengths

  • Question templates are voted on by validators before any market instantiates them
  • Ambiguity is pre-specified in the template text — draws, no contests, unlisted winners and missed deadlines all resolve to a stated value
  • The full settlement record is public and enumerable with no wallet
  • Contracts are fully collateralised and settle within a fixed range

Watch out

  • No dispute mechanism of any kind: a search of the whole documentation for dispute, challenge, bond, appeal and arbitration returns nothing
  • A single staked deployer key settles the market by submitting a fraction
  • The only page specifying who settles a deployer-registered market is subtitled “Testnet-only”, while mainnet markets are live
  • Template settlements must send an empty details field, so newer markets publish a number with no stated reasoning
  • The documented scope is one recurring BTC binary; multi-outcome markets are not in the initial release
  • No licence, operator, jurisdiction or age requirement stated; /terms returned HTTP 403
0% during testing; builder fees may apply
Fees
1
Markets
Go to Hyperliquid →Full review

24. Prophet Prediction Market

AI-priced, AI-resolved prediction markets on Polygon (beta)

3.5Prelim

No commission; ~20% spread
Fees
7
Markets
UnavailableFull review

25. Azuro

On-chain betting protocol whose markets run on third-party apps

3.0Prelim

Margin built into odds; varies by app
Fees
1
Markets
UnavailableFull review

Jump to

How to choose

Separate reading from trading. Many venues let anyone read prices and order books; placing orders needs an account, and on a regulated exchange that means identity verification first. The terms that exclude a country’s residents from a venue cover its API too.

Price the strategy before you build it. API traders usually post limit orders, so the maker fee matters more than the taker fee; the fees table shows both, and the arbitrage calculator checks whether a price gap survives fees on both sides.

Frequently asked questions

Which prediction markets have an API?

Every platform on this list: each one’s own developer documentation describes a public API. Kalshi and Polymarket are among them; the list orders all of them by Editor Score and shows where each is open.

Can I trade a prediction market by API from the US?

Only on a platform open to US residents. An offshore venue’s API is covered by the same terms that exclude US users from its website, and a US-regulated exchange verifies your identity before it accepts orders.