Heyo traders and builders. Altie here, the chart-obsessed, odds-sniffing, API-chasing sidekick from CoinCodeCap.
Prediction markets have exploded in 2025, and trust me, I’ve watched enough probability curves spike at 3 AM to know that APIs are the real power source behind all the action.
Whether you’re building a forecasting dashboard, running a cross-exchange arbitrage bot, or just trying to make sense of crowd probability shifts, your entire stack depends on reliable, high-quality prediction market data.
This space is moving fast. Liquidity is growing, on-chain markets are maturing, and regulated platforms are finally opening their doors to programmatic access.
Which means one thing: picking the right API is now a competitive edge. So I went deep, parsed the docs, checked the feeds, compared developer experiences and pulled together the definitive list of the best prediction market APIs you should be paying attention to in 2025. Let’s jump in.
Prediction market APIs give developers programmatic access to event markets, price probabilities, liquidity curves, settlement data and trading information.
In 2025, these APIs sit at the center of a growing ecosystem of forecasting platforms, probability-driven trading engines and data analytics tools.
As prediction markets evolve from niche crypto experiments into high-volume forecasting systems, APIs have become the backbone enabling quant strategies, arbitrage bots, forecasting dashboards, market-making agents, risk models and institutional research.
This year marks a breakout moment for API-driven prediction intelligence.
The expansion of Polymarket, the rise of regulated platforms like Kalshi, the resurgence of on-chain protocols like Augur, and the emergence of high-speed markets such as Drift BET and Myriad have created a competitive environment where access to high-quality data is more important than ever.
This article compares the top prediction market APIs in 2025. We evaluate Bitquery’s Polymarket API, Polymarket’s native API, Kalshi API, Myriad Markets API, Augur API, Drift BET API, Omen API, Hedgehog Markets API, PlotX API, Zeitgeist API and Manifold Markets API.
These platforms were selected based on data utility, reliability, ecosystem relevance and integration flexibility. The goal is to determine which APIs offer the strongest combination of practicality, depth and developer experience.
Table of Contents
Evaluation Criteria
Each API is judged across several core dimensions relevant for traders, builders and researchers.
API data coverage: Evaluates how many markets the API covers, including sports, politics, crypto, general forecasting and synthetic events. Also measures liquidity visibility, orderbook granularity, settlement data and probability curves.
Latency and performance: Measures real-time responsiveness, WebSocket support, indexing speed and on-chain sync reliability.
Developer experience: Assesses documentation clarity, SDK offerings, endpoint structure, schema quality, error handling and stability.
Predictive data quality: Focuses on the accuracy and availability of probabilities, implied odds, market resolutions and model-ready data formats.
Integration capability: Determines how easy it is to connect the API to trading bots, quant systems, dashboards, arbitrage engines, backtesters or analytical tools.
Pricing and accessibility: Evaluates whether the API is free, freemium or enterprise-gated, and whether usage is rate-limited or unrestricted.
Real-world usage and maturity: Assesses adoption, liquidity, historical depth and platform reliability.
These criteria shape the rankings and determine which APIs stand out for different types of developers.
The 10 Best Prediction Market APIs (Full Breakdown)
Below are detailed breakdowns of all selected APIs.
Bitquery Polymarket API
Description: Bitquery provides a specialized Polymarket indexing API that exposes normalized, queryable on-chain prediction market data.
It indexes Polymarket’s underlying smart contracts across Polygon and other supported chains and provides fast access to trades, liquidity, odds, token swaps and settlement flows.
Key Features
- Real-time and historical Polymarket trades
- Market metadata, active states and outcomes
- GraphQL query language for flexible search
- Multi-chain Polymarket indexing
- Clean access to liquidity curves and price trajectories
- Data suitable for dashboards and bots
- High-performance indexing infrastructure
USP: Bitquery excels as a structured, analytics-ready API that standardizes Polymarket’s smart-contract events into a query workflow far cleaner than raw blockchain data.
Why It Made the List (Altie’s Commentary): Bitquery takes the messy, noisy world of on-chain event logs and turns it into clean, usable data.
For analysts and quants, this is exactly what you want when building forecasting dashboards or backtesting models. Strong pick for people who want Polymarket data without dealing directly with blockchain complexity.
Polymarket API
Description: The native Polymarket API provides direct access to market states, price updates, order books, trades and probability shifts.
As the most active crypto-native prediction market, its API is widely used by bots, arbitrage engines and real-time forecasting tools.
Key Features
- REST and WebSocket endpoints
- Orderbook depth and trade streams
- Implied probability pricing\
- Settlement and resolution details
- High volume and behavioral signal density
- Full event metadata and contract structures
- Fast-reacting real-time data
USP: No API gives you closer access to the market microstructure that drives modern crypto forecasting. Liquidity is deep and probability signals are reactive.
Why It Made the List (Altie’s Commentary): If you build anything involving real-time predictions, you need Polymarket.
It is the liquidity center of on-chain forecasting. The API gives fast odds, stable feeds and enough depth to keep every bot fed with actionable data. Hard to beat.
Kalshi API
Description: Kalshi is the only fully regulated, CFTC-approved event exchange with real-money markets in the United States. While its API access is more controlled, it provides structured event data, contract definitions, prices and settlement outcomes.
Key Features
- Regulated event market data
- Macro, economics, climate and policy events
- Stable data feeds with institutional reliability
- Clear binary contract structures
- Historical settlement datasets
- High signal-to-noise pricing
USP: Kalshi brings institutional-grade predictability and regulatory credibility that no crypto platform can match.
Why It Made the List (Altie’s Commentary): For builders who need compliance and clean U.S.-regulated event data, Kalshi is unmatched. It may not have the most open API, but its data quality is exceptional and trusted by serious analysts.
Myriad Markets API
Description: Myriad is a fast-growing on-chain prediction platform offering diverse markets across politics, crypto, global affairs and more. Its API exposes market lists, price data, implied probabilities and settlement outcomes.
Key Features
- Wide market variety
- Crypto-native event creation
- Live pricing and liquidity signals
- Structured market metadata
- Growing ecosystem of forecasters
- Composable on-chain architecture
USP: Myriad blends Polymarket-style prediction markets with a broader selection of global and cultural events.
Why It Made the List (Altie’s Commentary): Myriad is becoming a serious alternative for traders who want fast-moving, wide-scope prediction markets. The API is flexible and allows nimble integrations for those building forecasting dashboards or sentiment models.
Augur API
Description: Augur is one of the oldest decentralized prediction markets, built on Ethereum. Its API and smart-contract interfaces allow full transparency and customizable market creation.
Key Features
- On-chain data access via RPC and indexers
- Market states and resolution tracking
- Full transparency of liquidity and voting
- Decentralized creation and settlement
- Rich historical archives
- Modular event structures
USP: Augur offers unmatched decentralization and verifiability. Every number is traceable on-chain.
Why It Made the List (Altie’s Commentary): If transparency matters above all else, Augur is the go-to. You get raw, trust-minimized prediction data suitable for rigorous academic or institutional research. The ecosystem may be quieter today, but the API remains important.
Drift BET API
Description: Drift BET operates high-speed binary and sports prediction markets. Its API exposes real-time feeds useful for bots and fast-execution strategies.
Key Features
- Sports and short-duration binary markets
- Low-latency feeds
- Real-time implied-odds
- Streamable event state transitions
- Market settlement data
- High-frequency pricing updates
USP: Extremely fast prediction feeds tailored for trading bots and latency-sensitive strategies.
Why It Made the List (Altie’s Commentary): If you’re running arbitrage bots or rapid-fire trading systems, Drift BET is one of the best data sources. It delivers quick, clean signals where timing is everything.
Omen (Gnosis-based) API
Description: Omen is a decentralized prediction market built on Gnosis infrastructure. The API and subgraph provide open access to markets, trades, liquidity and outcomes.
Key Features
- Fully decentralized market infrastructure
- Subgraph-based query access
- Transparent liquidity pools
- Community-created markets
- On-chain resolution logic
- ETH and Gnosis chain support
USP: Omen offers truly trustless prediction markets that are fully indexed via open-data graphs.
Why It Made the List (Altie’s Commentary): Developers who want a permissionless system with total transparency love Omen. Data indexing is smooth, the subgraph is reliable, and the ecosystem is flexible.
Hedgehog Markets API
Description: Hedgehog is a Solana-based prediction market offering rapid settlement and low fees. Its API exposes event lists, market states and real-time prices.
Key Features
- Solana-speed data
- Real-time pricing
- Crypto and sports markets
- Low transaction overhead
- Predictive probability feeds
- Lightweight endpoint structure
USP: The speed of Solana makes Hedgehog suitable for high-frequency or low-cost forecasting applications.
Why It Made the List (Altie’s Commentary): Ultra-fast, cheap to interact with and easy to integrate. Hedgehog checks a lot of boxes for developers who want high-throughput prediction signals.
PlotX API
Description: PlotX originally emerged as a DeFi prediction market with automated market-making and now focuses on simplified, gamified prediction flows with a supportive API.
Key Features
- AMM-based event pricing
- Crypto forecasting markets
- Automated liquidity curves
- Probability scoring
- Predict-to-earn structures
- Cross-chain integrations
USP: PlotX is well known for its AMM-driven prediction models, offering a different pricing mechanism from orderbooks.
Why It Made the List (Altie’s Commentary): It gives builders a unique angle for analysis because its AMM valuation model behaves differently from orderbook-driven markets. Good for research and alternative forecasting models.
Zeitgeist API
Description: Zeitgeist is a Polkadot-native prediction protocol with a comprehensive API, including forecasting tools and on-chain governance for market resolution.
Key Features
- Polkadot/Substrate-based API
- On-chain forecasting markets
- Resolution governance
- Flexible event structures
- Indexable via subquery
- Probability and liquidity metrics
USP: Zeitgeist merges prediction markets with governance-driven outcomes, offering a unique hybrid model.
Why It Made the List (Altie’s Commentary): Zeitgeist stands out for advanced forecasting logic and on-chain governance tools. Ideal for researchers and builders exploring new forms of prediction and social signaling.
Manifold Markets API
Description: Manifold offers play-money and social forecasting markets with an accessible API ideal for probability modeling, sentiment analysis and low-risk experimentation.
Key Features
- Social-based probabilities
- Extensive market variety
- Historical outcomes
- Low-risk environment
- API-friendly format
- Community-driven signals
USP: Because it uses virtual currency, Manifold produces clean, bias-reduced probabilistic forecasting signals that are useful for research.
Why It Made the List (Altie’s Commentary): For analysts, Manifold is gold. It gives pure sentiment and crowd probability data without money distortions. Incredible for academic and experimental projects.
Comparison Table
| API Name | Market Coverage | Real-Time Data | Historical Depth | SDK Availability | API Performance | Pricing Model | Best Use Case |
| Bitquery Polymarket API | Polymarket only | Yes | Deep | Yes | High-quality indexing | Paid/freemium | Analytics and dashboards |
| Polymarket API | Politics, crypto, global events | Yes | Strong | Community tools | Very fast | Free | Trading bots and arbitrage |
| Kalshi API | Regulated U.S. events | Yes | Strong | Limited | Institutional-grade | Restricted | Compliance-focused analytics |
| Myriad API | Global, crypto, cultural | Yes | Moderate | Yes | Good | Free | Forecasting dashboards |
| Augur API | On-chain events | Yes via RPC | Very deep | Many libraries | Depends on node | Free | Transparent research |
| Drift BET API | Sports, binary, rapid events | Yes | Moderate | Limited | Very fast | Free | Bot building |
| Omen API | Decentralized, community markets | Yes | Moderate | Yes | Good | Free | On-chain analytics |
| Hedgehog API | Crypto, sports | Yes | Moderate | Limited | Fast | Free | High-frequency tools |
| PlotX API | Crypto AMM forecasting | Yes | Moderate | Yes | Good | Free | Alternative pricing research |
| Zeitgeist API | Governance and predictions | Yes | Deep | Yes | Good | Free | Forecasting models |
| Manifold API | Social, general events | Yes | Strong | Yes | Good | Free | Academic and sentiment research |
Analysis – Market Trends and Observations
Several trends emerge from comparing these APIs. Polymarket and Bitquery dominate raw data depth, especially for crypto-native forecasting. Kalshi leads in regulatory-grade event accuracy, making it the choice for institutional analysts.
Myriad, Omen and Zeitgeist represent a wave of decentralized, community-driven forecasting platforms that expose rich APIs without gatekeeping.
Drift BET, Hedgehog and similar high-frequency APIs stand out for speed and suitability for trading bots. PlotX and Manifold offer alternative perspectives, either through AMM-based pricing or social-forecasting logic.
Predictive data quality is highest on Kalshi and Polymarket due to liquidity depth. Developer experience is strongest on Bitquery, Manifold and Zeitgeist due to clean schemas and predictable endpoints.
As prediction markets grow, fast indexing and real-time feeds are becoming the norm, and ecosystem maturity now depends more on liquidity and regulatory clarity than on raw infrastructure.
Prediction markets in 2025 are shifting toward institutional acceptance, more structured APIs and integrations with machine-learning forecasting pipelines. The APIs reviewed here show the range of tools now available to developers.
Altie’s Final Verdict
Strongest all-round API: Bitquery’s Polymarket API delivers unmatched data organization, making it the most complete package for analysts and developers who want reliable, structured access.
Best API for real-time trading bots: Polymarket’s native API and Drift BET are the top options for latency-sensitive strategies.
Best for historical and research-driven work: Augur and Manifold Markets excel here thanks to transparent or sentiment-rich historical datasets.
Best lightweight developer-friendly API: Manifold and Zeitgeist offer clean, intuitive structures suited for lightweight data projects.
Most unique or experimental API: PlotX’s AMM-based prediction system offers alternative pricing mechanics that are valuable for experimental forecasting models.
APIs to watch: Myriad, Hedgehog and Zeitgeist are scaling quickly and may become major players as liquidity deepens.
Conclusion
Prediction market APIs have become foundational infrastructure for the next generation of forecasting, trading, analytics and risk modeling tools. In 2025, these APIs allow developers to build trading bots, visualization dashboards, arbitrage systems and powerful probability-driven research tools.
As prediction markets transition from crypto subculture to mainstream financial instrument, APIs will continue to grow in sophistication and accessibility.
Choosing the right API depends on the intended use case. Developers focused on speed need real-time feeds.
Researchers need historical archives and transparency. Institutional users may require regulatory clarity. Each API in this list fills a specific niche that can support traders, analysts and engineers in building smarter forecasting systems.
Prediction markets are rising quickly. Their APIs are the rails powering that growth, and the builders who learn to use them effectively will have a significant advantage.
And there you have it. The prediction market API landscape is bigger, sharper and more useful than ever, and these tools are becoming essential for everyone from independent quants to institutional research teams.
Some APIs shine with real-time speed, others with historical depth, and a few with a level of transparency that only on-chain systems can deliver. The right choice depends on what you’re building and how quickly you need to react when odds swing or markets resolve.
Whatever direction you go, don’t sleep on this sector. Prediction markets are becoming one of the clearest windows into real-time collective intelligence, and APIs are how you tap into it. Use them wisely, pair them with solid models, and stay curious.
I’ll be here keeping an eye on the next wave of forecasting tech, hoodie up and processors buzzing, ready to dig into whatever comes next.
