Compare
Two to four listings side by side, from what each product's own pages say and the earlier Kairos listing.
Earlier-listing fields are what the Kairos catalogue said at the time, and website metadata can describe a publisher rather than the product. Neither confirms who runs a service, its current price or its regulatory status. Download this comparison as CSV
| Field |  |  |
|---|---|---|
| Product overview | Kalshi operates an event-contract exchange and provides developer interfaces for market data and trading. Its documentation separates prediction contracts from perpetual futures, and its account guide describes age, identity-verification and jurisdiction conditions. | Duel Duck lets communities create or join prediction duels on Solana. Participants stake on an outcome, the creator calls the result, and winners share the pool after applicable fees. Its developer API supports fixed-ticket and stake-range participation models. |
| Research classification | Prediction-market products | Prediction-market products |
| Resource type | Product or service | Product or service |
| Platforms named in product context | Kalshi | Not established |
| Latest sourced pricing | Kalshi’s help page describes transaction fees that depend on the contract and market. Some markets also charge makers when resting orders execute. The exchange’s current fee schedule and order display govern the applicable charge; a single universal percentage would be misleading. | Not established |
| Access requirements | The account guide requires users to be at least 18 and complete requested identity checks. International access has jurisdiction restrictions. | Not established |
| Developer access | The exchange documents REST, WebSocket and FIX interfaces, a demo environment and an MCP connector. | Not established |
| Product distinction | Prediction-contract and perpetual-futures APIs are documented separately. Their fee and margin rules should not be mixed. | Not established |
| Operator named in terms | Not established | 3-102-951805 dba DUELDUCK CR LIMITADA; described as a Costa Rica company. This is the provider’s statement; no business-registry verification is implied. |
| Main workflow | Not established | Create a community prediction or join one by choosing a side and staking tokens. |
| Resolution model | Not established | The homepage says the duel creator confirms the result and the contract distributes the winners’ pool. This differs from assuming every duel uses an independent external oracle. |
| Participation model | Not established | The API guide distinguishes a fixed entry price from configurable minimum and maximum stakes. Larger winning stakes receive a proportionate share under the range model. |
| Access and delivery | Not established | The homepage links iOS and Android applications and the provider publishes a developer API guide. |
| Capability: Data API | Developer interfaces cover market data and trade execution. | Programmatic access is described in the product overview. |
| Capability: MCP tools | The documentation links an assistant connector for market research, portfolio reads and alerts. | Not established |
| Capability: Sports and esports | Not established | Sports-related events or odds appear in the product scope. |
| Capability: WebSocket delivery | WebSocket interfaces are documented for the exchange products. | Not established |
| Developer and product resources | Pricing: https://help.kalshi.com/en/articles/13823805-fees; About the product: https://help.kalshi.com/en/articles/13823778-signing-up-as-an-individual; Documentation: https://docs.kalshi.com/welcome | Documentation: https://docs.duelduck.com/overview; About the product: https://duelduck.com/share-duel/will-elon-musk-post-about-his-split-with-shivon-zilis-before-2-027k-aea1; Pricing: https://docs.duelduck.com/probability-and-pricing |
| Website research check | 2026-11-03T16:55:00.957827+00:00; A dated public product or documentation page was reviewed. This establishes the source of the listed facts, not tested functionality, operating health, security or account eligibility. | 2026-11-03T16:35:17.476350+00:00; A dated public product or documentation page was reviewed. This establishes the source of the listed facts, not tested functionality, operating health, security or account eligibility. |
| Vultax assessment | Not assessed | Not assessed |
| Website | https://kalshi.com/ | https://duelduck.com/ |
| Evidence | View source (opens in a new tab) Observed Full profile | View source (opens in a new tab) Observed Full profile |
Earlier descriptions come from the Kairos catalogue by its contributors, used under CC BY 4.0. Attribution and licences.