PolyEdge API · v1 · live

The pricing engine, as an API.

The same de-vigged, cross-venue consensus fair value that powers PolyEdge — for your own bots, dashboards, and models. One call in, a calibrated probability + confidence band + per-venue provenance out. We grade the price; you decide what to do with it.

See pricing → Live status endpoint

What you get

Prediction markets price the same event at different numbers on different venues, each carrying a vig. PolyEdge strips the vig, blends the venues in log-odds space (anchored on the sharpest de-vigged sportsbook line when one exists), and returns a single fair value with a 90% band derived from how much the venues actually disagree. It never predicts a winner — it prices the probability, and publishes its accuracy on a public ledger.

Endpoints

Base URL https://polyedge.vercel.app. Authenticate with Authorization: Bearer <key> (or X-API-Key). Every response is JSON with a stable api_version.

GET/api/v1/fair-value🔒 key required

Give a market identifier — a Kalshi ticker or a Polymarket slug — and get the cross-venue consensus fair value + band.

# de-vigged fair value for the Dodgers to win the 2026 World Series curl -H "Authorization: Bearer $POLYEDGE_KEY" \ "https://polyedge.vercel.app/api/v1/fair-value?ticker=KXMLB-26-LAD" # → { "fair_value": 0.2682, "band": [0.177, 0.384], # "sportsbook": 0.2373, "matched": true, # "parts": [{kalshi 0.372}, {polymarket 0.345}, {sportsbook …}] }
GET/api/v1/cross-venue🔒 key required

The full read for any market title: consensus, band, per-venue provenance, and the sharp-book de-vig. Pass the source venue + its YES price.

curl -H "Authorization: Bearer $POLYEDGE_KEY" \ "…/api/v1/cross-venue?q=Will+the+Dodgers+win+the+2026+World+Series%3F\ &venue=polymarket&yes=0.34"
GET/api/v1/statuspublic

No key needed. Lists endpoints, tiers, and confirms the API is live.

Rate limits are returned on every response as X-RateLimit-Limit / -Remaining / -Tier. Errors are JSON with an error code (missing_api_key, invalid_api_key, rate_limited, market_not_found).

Pricing

Metered by requests per minute. Neutral third parties only. (Self-serve signup + usage dashboards are rolling out; early access is by request.)

Start
Free
$0
30 req / min
  • Fair value + band
  • Cross-venue read
  • Personal / evaluation use
Most popular
Pro
$99/mo
300 req / min
  • Everything in Free
  • Production rate limits
  • Sharp-book de-vig included
  • Priority engine cache
Scale
Desk
$499/mo
1,200 req / min
  • Everything in Pro
  • Dedicated capacity
  • Higher burst limits
  • Direct support
Request an API key → Try the live status endpoint

The one rule

PolyEdge is a referee, not a player. The engine grades the price — it never sells a pick, and it is never licensed to a prediction-market venue. Selling "you're overpriced, bet elsewhere" to the house it points away from would break the neutrality that makes the number trustworthy. The API is for neutral third parties: traders, bots, researchers, and tools that want an honest fair value.

Prediction markets are risky. Nothing here is financial advice. Fair value is a cross-venue, de-vigged consensus — not a prediction of the outcome.