Assymetrix Launches the Deepest Independent Prediction Market Data API

NEW YORK - EntSun -- Assymetrix, the prediction market intelligence platform, today announced its data offering, commercially available May 15th 2026: the deepest independent prediction market dataset available, served through the purpose-built Assymetrix Data API. The platform indexes billions of rows — over 1.5 terabytes of structured, queryable prediction market data — across Polymarket, Kalshi, and Limitless, normalized into a single unified schema and accessible through a tiered REST API. The free tier provides unlimited access to current market metadata across all three platforms, with paid tiers unlocking historical depth, on-chain data, and real-time streaming. Predict.fun integration is in active development, with additional platforms planned for the same quarter.

The launch comes at a critical moment for the prediction market industry. Monthly trading volume has surged past $23 billion. Harvard researchers have identified $143 million in suspected insider trading profits. The CFTC's workforce has shrunk 24% to its smallest size in 15 years. And in February 2026, Polymarket acquired Dome — the most credible independent cross-platform data API — eliminating the only venue-neutral data layer available to developers.

"When the largest exchange acquires the best independent data provider, it creates a structural conflict of interest,"

"A Polymarket-owned API will never objectively tell you that Kalshi has better liquidity on a specific market. The intelligence layer only works if the data layer is neutral. That's what we built."

"Most data platforms sit on top of public APIs and call it infrastructure — we went deeper. We indexed nearly two billion on-chain events from genesis, reconstructing every trade, position, and wallet movement across prediction markets. This isn't just data aggregation — it's a complete financial history, giving developers and institutions access to market intelligence that has never existed at this depth before,"

What Assymetrix Has Indexed
The Assymetrix data infrastructure represents the most comprehensive independent prediction market dataset assembled:

Nearly 2 billion on-chain events — Token transfers, matched orders, order fills, position splits, merges, payout redemptions, and condition resolutions across Polymarket and Limitless SQD, with historical coverage back to September 2020. Both CTF exchange contracts (Standard and NegRisk) are indexed — a distinction most competitors and researchers miss entirely.

Over 270 million off-chain metadata records — Complete market catalogs across Polymarket, Kalshi, and Limitless, including markets, events, outcomes, trades, user positions, and real-time data.

Over 200 million price snapshots — Time-series probability data captured at regular intervals, creating a continuous probability surface across all indexed markets from March 2026 onward.

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Over 30 million canonical layer records — A unified normalization schema mapping markets, events, outcomes, trades, and orderbooks across all three platforms into one queryable structure.

Why It Matters Now
The prediction market industry has outgrown its data infrastructure. Five structural dynamics are converging simultaneously:

The Dome vacuum. Polymarket's February 2026 acquisition of Dome (YC Fall 2025, $5.2M raised, 50+ developers) removed the only independent cross-platform data API from the market. The 50+ developers who built on Dome are now unserved.

The integrity crisis. The first criminal prosecution for prediction market insider trading (the Van Dyke case — a U.S. Army Special Forces soldier who used classified intelligence to profit $409,881 on Polymarket) exposed a $143 million suspected insider trading problem that Harvard researchers documented across 210,718 suspicious wallet-market pairs. Detecting these patterns requires exactly the on-chain depth Assymetrix provides.

The institutional flood. Cboe, Nasdaq, Goldman Sachs, Robinhood, Coinbase, Binance, and Crypto.com have all entered prediction markets in 2026. Every new platform creates another data source that needs aggregation and normalization.

The regulatory expansion. The CFTC has issued its first prediction market advisory, filed an Advanced Notice of Proposed Rulemaking, and sued three states to defend its regulatory authority — all while its staff shrinks. Cross-venue transparency is becoming a regulatory requirement, not just a trading advantage.

The AI agent explosion. Autonomous trading agents and AI-powered analytics tools are proliferating across the prediction market ecosystem. Every one of them is built on single-platform data. Assymetrix's upcoming MCP server will give AI agents cross-venue sight for the first time.

The Assymetrix Data API
Assymetrix's data is served through the Assymetrix Data API — a read-only REST API designed to make prediction market data easy to consume. All data across Polymarket, Kalshi, and Limitless is normalized so developers don't need to handle platform-specific differences. Access is managed through API keys with tier-based permissions: the free tier provides unlimited access to current market metadata across all three platforms, with paid tiers unlocking historical depth, on-chain data, real-time streaming, and bulk export. Python and TypeScript client SDKs are on the roadmap.

A built-in playground in the developer portal allows developers to explore endpoints and test requests with their API key before integration.

Five Findings from Building the Infrastructure
The process of indexing billions of rows revealed structural insights about prediction market data that inform the product:

Resolution mismatch is systemic. A significant portion of markets that appear identical across platforms have material differences in resolution rules — the "same question" is often two different contracts. The Assymetrix schema captures resolution metadata at the contract level.

Liquidity quality varies more than quantity. Two markets with the same dollar volume can have completely different signal quality depending on bid-ask spread, trader concentration, and time-weighted activity.

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On-chain data is the deepest moat. Wallet-level P&L reconstruction, trading pattern analysis, and capital flow tracking require on-chain data that no off-chain API provides. Assymetrix's on-chain archive is unique in the independent data market.

The Dome acquisition validated the thesis. Polymarket spending millions to acquire the independent data layer proves cross-platform data infrastructure is valuable — and created the neutrality gap Assymetrix fills.

Intraday data reveals what daily data hides. With over 200 million price snapshots, Assymetrix captures the velocity of price discovery — how fast markets react, how quickly platforms converge, and where temporary divergence creates trading opportunities.

What's Coming Next
The data layer is the foundation — not just for the API, but for a full-stack prediction market platform.

Today's launch is the first product in a broader infrastructure play. Assymetrix is building toward a vertically integrated prediction market ecosystem where the data layer, the intelligence layer, and the exchange layer are built on the same infrastructure. The same canonical schema that normalizes data across existing venues today will power Assymetrix's own native prediction market exchange — enabling a trading experience informed by the deepest cross-venue intelligence in the industry.

The roadmap:

Predict.fun integration — In active development, expanding the canonical schema to a fourth venue this quarter

Additional platform integrations — Multiple new venues planned for Q2/Q3 2026 as the prediction market ecosystem expands rapidly with new entrants from Cboe, Nasdaq, Robinhood, and others

MCP Server — Full dataset accessible to AI models via Model Context Protocol

Python and TypeScript SDKs — Drop-in libraries for common development environments

Admin key access — Team management for Business and Enterprise tiers

Cross-venue intelligence platform — Dashboards, whale tracking, arbitrage detection, AI-powered signals, and the structural-adjustment engine built on top of the data layer

Assymetrix Exchange — A native prediction market exchange with contracts designed from the ground up on the same data infrastructure, combining the intelligence layer's structural insights with a trading venue built for transparency, liquidity quality, and resolution integrity

"Every new platform that launches makes our data layer more valuable, not less," said Karakitsos. "We started with three venues. Predict.fun is next. By the end of the quarter, we'll cover more platforms than any independent data provider in the space. And most prediction market platforms built their exchange first and their data infrastructure as an afterthought. We built the data layer first — deliberately. When you understand the structural problems across the industry at the data level, you can design an exchange that solves them. That's where we're heading."

About Assymetrix
Assymetrix is a prediction market intelligence and infrastructure company building the data layer, intelligence layer, and exchange layer the industry is missing. The company indexes, normalizes, and adds intelligence across prediction market venues — providing venue-neutral data infrastructure for developers, traders, researchers, and institutions — with a native exchange on the horizon. Assymetrix currently covers Polymarket, Kalshi, and Limitless in one unified schema, with Predict.fun and additional platforms being integrated this quarter.

For more information, visit https://assymetrix.com
For developer access, visit https://data.assymetrix.com

Resources
Blog: We Indexed Every Prediction Market Into One Schema. Here's What We Found.
Twitter/X: @assymetrix_com