Predict00r
138K+ markets across 4 platforms

Prediction marketintelligence.

One platform to search, analyze, and compare prediction markets across Polymarket, Kalshi, Probable, and OpinionTrade.

138K+
Markets
4
Platforms
REST
API
Free
To Use

Four tools. One platform.

Everything you need to find, analyze, and act on prediction market opportunities.

Smart Dashboard

AI-matched markets for your expertise

Describe what you know — biotech, macro, politics, AI, crypto — and get a ranked feed of prediction markets where your knowledge gives you a real edge. Filter by platform, volume, spread, and more.

Expertise matchingEdge scoringWatchlist & alertsBid/ask spreads

Price Alerts

Never miss a market move

Set price thresholds, volume spikes, spread drops, or "ending soon" triggers on any market across all 4 platforms. Get notified instantly via Telegram or email the moment your condition hits.

Price & spread alertsTelegram & emailVolume spike detectionFree to use

Markets API

One API for all prediction markets

Unified REST API covering Polymarket, Kalshi, Probable, and OpinionTrade. Search, filter, and stream 138K+ markets with normalized schemas. Free preview endpoint, no key needed.

REST + JSONFree preview endpointSearch & filterOracle endpoint

Arbitrage Scanner

Find cross-platform mispricings

The scanner continuously monitors the same question across Polymarket, Kalshi, Probable, and OpinionTrade. When prices diverge, it surfaces the opportunity with live bid/ask data and exact ROI.

Live ROI calculationBid/ask spreadsAI market matchingUpdated every 5 min

See it in action

Pick an expertise profile. Watch the AI find your markets in real-time.

Price Alerts

Never miss a
market move.

Set a price threshold on any market. The moment it crosses your target, you get notified — so you can act, not react.

  • Price threshold alerts on any market
  • Covers all 4 platforms — Polymarket, Kalshi, Probable, OpinionTrade
  • Instant notifications when your target hits

Threshold Alerts

Trigger when a market crosses your target price — above or below.

Any Platform

Monitor markets across Polymarket, Kalshi, Probable, and OpinionTrade.

Instant & Free

No subscription needed. Alerts are included in your free account.

Get started in 60 seconds

01

Describe your expertise

Tell us what you know — biotech, macro, politics, AI. The more specific, the better your market matches.

02

Get matched markets

Our AI compares your expertise against 138K+ live markets and ranks them by how well they align with your knowledge.

03

Trade with conviction

Use Lens and the API to research opportunities. Click through to trade directly on the platform.

Developer API

One API. Every market.

Unified access to 138K+ prediction markets across Polymarket, Kalshi, Probable, and OpinionTrade. Real-time prices, semantic search, and arbitrage detection.

# Free preview — no API key needed:
curl "https://predict00r.com/api/v1/preview"

# Full access with your API key:
curl -H "Authorization: Bearer em_your_key" \
  "https://predict00r.com/api/v1/markets?platform=polymarket&limit=5"

9 endpoints. Everything you need.

GET/api/v1/preview
free

Free preview — 3 top markets, no auth required

Params: none

GET/api/v1/markets
pro

List and filter markets across all platforms

Params: platform, status, q, sort, order, min_volume, page, limit

POST/api/v1/search
pro

Semantic search — find markets by meaning, not keywords

Params: query, limit, platform, min_similarity, active_only

GET/api/v1/markets/:id
pro

Market detail with confidence score, cross-platform matches, and all price fields

Params: id (UUID or external_id)

GET/api/v1/markets/:id/history
pro

Price history time series — up to 500 points per page with date range filters

Params: id, from, to, page, limit

GET/api/v1/markets/:id/orderbook
pro

Current top-of-book snapshot: YES/NO bid, ask, mid price, and spread

Params: id (UUID or external_id)

GET/api/v1/events
pro

Markets grouped by event — combined volume, all sub-markets

Params: platform, q, sort, order, page, limit

GET/api/v1/arbitrage
pro

Live arbitrage opportunities across platforms

Params: min_roi, min_similarity, platform, sort, page, limit

POST/api/v1/markets/:id/refresh
pro

Refresh market prices on demand from source platforms

Params: include_similar, similar_limit

100 req/day free • No credit card

Live Arbitrage Scanner

Find cross-platform mispricings.

The same question, different prices. Buy YES cheap on one platform, NO cheap on another — and lock in risk-free profit. Updated every ~5 minutes.

Intelligence Briefings

Markets that matter
to you.

Get personalized prediction market briefings delivered to your inbox. We track the biggest movers aligned with your interests and send you a curated digest.

  • Personalized to your expertise and interests
  • Weekly, bi-weekly, or monthly cadence
  • Biggest price movers, new markets, resolved bets
  • Free forever — unsubscribe anytime

The more specific you are, the better your briefings.

Free forever. Unsubscribe anytime with one click.

Simple pricing

Start free. Scale when ready.

The full dashboard is free forever. Upgrade only when you need full API access.

Free

For individuals exploring prediction markets

$0forever

100 API requests / day

  • Dashboard & expertise matching
  • Price alerts across all 4 platforms
  • Oracle (2 questions / day)
  • Lens cross-platform comparison
  • Preview API endpoint (no key needed)
  • Community support
Most Popular

Pro

For traders and researchers needing full API access

$49/month

10,000 API requests / day

  • Everything in Free
  • Full API: markets, search, detail
  • Arbitrage API endpoint
  • Full pagination & filters
  • Priority support

Enterprise

For teams and production applications

$299/month

Unlimited API requests

  • Everything in Pro
  • Unlimited requests
  • Dedicated support
  • Custom integrations
  • SLA guarantee
No credit card required for Free planCancel anytimeBilled monthly via StripeInstant API access after payment

Full feature comparison

FeatureFreeProEnterprise
Dashboard & expertise matching
Price alerts (all platforms)
Lens cross-platform comparison
Briefings
API preview endpoint
API daily request limit10010,000Unlimited
Markets list & search API—
Market detail API—
Arbitrage API endpoint—
Full pagination & filters—
SupportCommunityPriorityDedicated
Custom integrations——
SLA guarantee——

FAQ

What is Predict00r?
Predict00r is a prediction market intelligence platform. We aggregate 138,000+ markets from Polymarket, Kalshi, Probable, and OpinionTrade into a single interface with AI-powered tools: expertise matching, a unified API, and cross-platform arbitrage detection.
How does expertise matching work?
Describe your domain knowledge (e.g. "biotech researcher focused on FDA approvals"). Our AI embeds your profile and compares it against all 138K+ markets using semantic similarity. You get a ranked feed of markets where your specific knowledge gives you a trading edge.
What is Lens?
Paste any prediction market URL from Polymarket, Kalshi, Probable, or OpinionTrade. Lens finds the same question on other platforms, compares prices side-by-side, and highlights arbitrage opportunities where platforms disagree on probability.
How does arbitrage work?
When the same question trades at different prices on different platforms, you can buy YES on the cheaper one and NO on the expensive one. If the combined cost is below 100¢, you lock in a guaranteed profit regardless of the outcome. Our scanner finds these gaps in real time.
Is the API free?
The preview endpoint (/api/v1/preview) is completely free — no API key needed. For full access to all 9 endpoints, generate an API key from your dashboard. Free tier: 100 requests/day. Pro: 10,000/day at $49/month. Enterprise: unlimited at $299/month.
What does the API return?
All endpoints return JSON with a data field (the results) and a meta field (pagination info). Markets include normalized fields: title, price, volume, bid/ask spread, platform, end date, and more. Semantic search uses AI embeddings to find markets by meaning.
Can I use the API for commercial projects?
Yes. All paid tiers (Pro and Enterprise) allow commercial use. The Free tier is for evaluation and personal projects.
Is Predict00r free?
Yes — the full dashboard, expertise matching, Lens, price alerts, and briefings are all free. No credit card required. API Pro and Enterprise plans are paid.
Which platforms do you cover?
Polymarket, Kalshi, Probable, and OpinionTrade — covering 138,000+ markets. We sync prices, volumes, bid/ask spreads, and new listings every few minutes across all platforms.
Do you execute trades?
No. Predict00r is a discovery and intelligence layer. When you find a market, click through to the platform to trade directly. We help you find the opportunity — you decide when and where to act.
How does billing work?
API plans are billed monthly via Stripe. Cancel anytime — your plan stays active until the end of the billing period, then reverts to Free. No long-term contracts.

Start finding better markets

Free dashboard, alerts, and API. No credit card, no trial — just sign up and go.