Polymarket API (CLOB) vs Gemini Predictions API
Side by side from sourced facts: pricing, markets, custody, incidents and each bot’s rule-based report card. We don’t pick a winner; what fits depends on how you trade.
| Polymarket API (CLOB) | Gemini Predictions API | |
|---|---|---|
| Report card | Caution At least one documented security incident, regulator action (non-fraud) or unverified performance claim in the last 5 years. | Caution At least one documented security incident, regulator action (non-fraud) or unverified performance claim in the last 5 years. |
| Category | Prediction market bots | Prediction market bots |
| What it is | Polymarket's official developer APIs and SDKs for market data and placing orders on its order book. | Gemini's prediction markets, with an official Prediction Markets REST API and WebSocket feeds for automated trading. |
| Pricing | Taker fees on some markets, set by the protocol (formula fee = C × feeRate × p × (1 − p)); makers pay no fees; geopolitical and world-events markets are fee-free. Source: docs.polymarket.com/trading/fees.md | Not verified yet |
| Markets / exchanges | Polymarket Source: docs.polymarket.com | Gemini Predictions (event contracts) Source: docs.gemini.com/llms.txt |
| Your money | Self-hosted: you run the software and your keys stay on your machine. | Trades through your account on a regulated exchange via its API. |
| Code / license | Proprietary | Proprietary |
| Facts on record | Jan 3, 2022: per the CFTC, Blockratize Inc. d/b/a Polymarket settled charges of offering off-exchange event-based binary options without DCM designation or SEF registration; $1.4M civil penalty and an order to wind down non-compliant markets. Source: cftc.gov/PressRoom/PressReleases/8478-22 | Jan 13, 2025: per the CFTC, a federal court ordered Gemini Trust Company to pay a $5M penalty over false or misleading statements and omissions to the CFTC about a proposed bitcoin futures contract. Source: cftc.gov/PressRoom/PressReleases/9031-25 Feb 28, 2024: NYDFS consent order; Gemini Trust Company agreed to a $37M penalty for compliance failures and to help return at least $1.1B to Earn customers. Source: dfs.ny.gov/reports_and_publications/press_releases/pr202402282 |
| Official site | docs.polymarket.com | gemini.com |
Facts checked Oct 15, 2026. Report cards follow published rules; payouts never change them. Not investment advice.
Polymarket API (CLOB) fact sheet Gemini Predictions API fact sheet