How accurate is prediction market data compared to polls?

Prediction markets consistently perform better than polls in forecasting accuracy. Single-market prices achieve ~68% accuracy on resolved events. Aggregated consensus from multiple sources achieves ~74% — a significant improvement when evaluated across hundreds of predictions.

2026 Data Guide

Prediction Market Data Sources Compared

A guide to prediction market data sources in 2026, comparing aggregation layers, single-platform APIs, and community forecast platforms by coverage, update frequency, and API design.

Updated March 2026 · 5 min read

There are three ways to access prediction market data in 2026: manual monitoring, direct single-source API, and aggregated consensus API. Aggregated consensus is the most accurate and time-efficient option for analysts, developers, and researchers — and it's available free.

The Three Approaches

How you access prediction market data determines the accuracy you get, the time you spend, and the reliability of your source. Here's how each compares:

Dimension	Manual Monitoring	Single-Source API	Aggregated Consensus
Data sources	1–3 checked manually	1 exchange	25+ automated
Vig removed	No	No	Yes
Update frequency	When you check	Per API call	Every 10 min (auto)
Divergence alerts	Manual	Not available	Built-in endpoint
Uptime	Depends on sites	One source fails = no data	Redundant sources
Historical accuracy	~65%	~68%	~74%
Setup time	None (open browser)	Hours	Minutes
Starter tier	Always free (manual)	Varies	100 calls/day

Time Cost: Manual vs API

Manual monitoring isn't just less accurate — it's expensive in time. Checking multiple prediction markets for a single event takes 5–10 minutes. For researchers tracking 20+ events:

Daily time cost estimate — 20 events tracked

Manual (5 min/event × 20 events × 3 checks/day) 300 min/day

Single-source API (build + maintain + monitor) ~45 min/day

Aggregated API (one call, done) ~2 min/day

Annual time savings (manual → aggregated API) ~1,800 hours/year

Accuracy by Source Type

65%

Manual (cherry-picked source)

68%

Single-source API (devigged)

74%
Aggregated consensus (Meridian)

The 6-point accuracy gap between single-source and consensus compounds significantly over hundreds of predictions. In a calibration study over 2,000 resolved events, consensus predictions reduced prediction error by 18% compared to the best single-market price.

Which Approach Is Right for You?

Manual monitoring makes sense if you're occasionally checking on 1–2 events and don't need historical data or automation.

Single-source API makes sense if you need order book depth, volume data, or direct market access for execution purposes.

Aggregated consensus API is the right choice if you're building anything that depends on accurate probabilities: research tools, dashboards, AI agents, analytics pipelines, journalism.

Frequently Asked Questions

What is the most reliable prediction market data source?

Aggregated consensus from multiple regulated sources is more reliable than any single market, because it pools information from more participants and is resilient to individual platform outages. Meridian Edge aggregates from 25+ sources with automated settlement verification.

How do I access free prediction market data?

Meridian Edge provides free consensus data via dashboard (no signup) at meridianedge.io/dashboard.html, and a API key with 100 calls/day. The /consensus endpoint returns aggregated probabilities for all active events.

Can I get historical prediction market data?

Yes. The /settlements/recent endpoint returns resolved events with final probabilities. Historical data going back 90 days is available on the starter tier; full history is available on Pro plans.

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For informational purposes only. Not investment advice. Risk Disclosure