OPINION vs Seer: markets, liquidity and risk (2026)

OPINION and Seer both let users trade predictions on real-world events, but they emphasize different parts of the experience. OPINION focuses on a broad menu of markets, spanning sports, esports, crypto, politics, macro, business and more. It also offers multi-outcome events, live share prices that can be read as implied probabilities, and the option to sell a position before resolution.

Seer puts more emphasis on market creation and market structure. Users can create markets and choose among categorical, multi-categorical, scalar and multi-scalar formats. Its outcome tokens use the Conditional Tokens framework, with ERC1155 positions wrapped into ERC20 tokens for trading and DeFi use. In short, OPINION is the clearer fit for browsing a wide variety of event markets; Seer is more suited to users who want to shape markets or use different outcome formats.

OPINION has about $2.8 million in TVL, compared with about $322,532 for Seer. That makes OPINION the larger of the two by this measure, and its headline markets have recorded substantial volume. Activity is not uniform, though: some OPINION markets show almost no volume, so check the specific market’s depth and spread before trading. Seer’s smaller TVL may also mean thin order depth and wider spreads on many markets.

Neither platform publishes a complete fee schedule. OPINION describes its fees as low, but does not publish a trading-fee percentage or deposit and withdrawal costs. Seer does not publish trading, market-creation or liquidity-provider fees. Both involve on-chain activity, so network gas costs may apply; the amount is not published as a fixed fee and can vary. Check the trade interface and relevant documentation before placing a position.

OPINION has two audits listed, but the auditors, reports and scope are not published. Its custody model, upgrade permissions and AI Oracle dispute process are also not described in detail. Seer has no audits listed, and public audit reports, a bug bounty and incident history are not published. Treat contract risk as real on both platforms, with less independent audit information listed for Seer.

Resolution is another risk to consider. OPINION describes an AI Oracle and proprietary on-chain infrastructure, but does not give much public detail about how disputed outcomes are handled. Seer relies on Reality.eth answers, with Kleros settling disputes; ambiguous wording can still lead to delays or contested results. Neither project publishes its licensing, KYC requirements or regional restrictions. Check the law where you live, do not try to bypass restrictions or identity checks, and only use prediction markets if you are 18 or older.

Choose OPINION if you want a wider range of ready-made markets, especially across sports, esports, crypto and macro topics. Its larger TVL, active headline markets, pre-resolution trading and two listed audits give it the edge for users who prioritize market choice and relative scale. Still, liquidity varies by market, its track record is short, and audit details and key compliance information are not published.

Choose Seer if creating markets, selecting among four outcome formats, and using a decentralized arbitration process matter more to you than scale. Its Gnosis and Ethereum deployment and composable outcome tokens may appeal to users familiar with DeFi, but its TVL is smaller and no audits are listed. Neither is an obvious choice for anyone who needs clearly published fees, licensing or KYC requirements. Check the market rules and local requirements before committing funds.