--- url: "https://predictiontoolkit.com/tools/crosswire/" publisher: "PredictionToolkit" dateModified: "2026-11-03" --- [← Resolution]() ![Crosswire logo]() Data API # Crosswire: check whether matched contracts settle the same way Crosswire compares the resolution rules of apparently matching Polymarket and Kalshi contracts. Its API names differences in sources, timing, event scope and void conditions before a strategy treats a price gap as an arbitrage opportunity. [**3.5**/ 5Editorial rating]() [Editorial assessment]() [Open Crosswire]() crosswire-api.com **Available on:** API · MCP **Pricing:** The published metered audit price is US$0.02 per call, paid in USDC on Base through x402. [Screenshots]() [Explore alternatives]() [Resolution]() [Data APIs]() +3 more [MCP servers]() [Risk management]() [Arbitrage]() ## Screenshots and interface Product preview1 / 2 The API presentation includes an example request. ## What is Crosswire? A matching title or strike does not establish equivalent settlement. A contract may use another price index, closing instant or cancellation rule. Crosswire fits between pair discovery and execution, returning a structured verdict and findings about these differences rather than forecasting which outcome will win. Coverage discovery supplies supported event and pair identifiers. REST and MCP expose the audit for code and agents, and free covered examples provide an integration starting point. A verdict applies to the inspected pair and snapshot: it is neither universal matching coverage nor an instruction that places either leg of a trade. ### Who it is for - Developers building strategies across prediction venues. - Researchers auditing the rules of matched event contracts. - Agents needing structured reasons to reject a proposed market pair. ## Features and coverage - **Rule comparison** Compare the oracle or source, settlement instant, event scope and conditions that can void a contract. - **Verdict and findings** Read SAFE, CAUTION or BLOCK alongside individual findings and severity fields. A label should not replace inspection of the reported differences. - **Audit record** The response identifies both legs, match confidence, rule flags, snapshot age and ruleset hash. - **Coverage discovery** List supported events and pair identifiers before requesting an audit; coverage is limited to those listed pairs. - **REST and MCP access** Call the audit route from code or use coverage-discovery and resolution-risk tools through an MCP client. - **Metered crypto access** The crypto inventory uses x402 payments on Base. Public example pairs let developers inspect the response before enabling paid calls. ## Workflows with Crosswire ### Audit a proposed hedge Resolve the pair to supported market references, request the audit and examine every divergence. Feed both the verdict and detailed rule findings into the strategy’s eligibility decision. ### Retain the decision context Keep the audit result attached to the decision it informed. Leg identifiers, findings, snapshot age and the ruleset hash let a later reviewer identify the contracts and rule version behind that decision. ### Start with a covered example Use a free supported pair to inspect the full response shape and confirm handling of findings and data age before enabling metered requests. ## Pricing and total cost The published metered audit price is US$0.02 per call, paid in USDC on Base through x402. **Access:** Covered World Cup example pairs are free to audit. Consult the coverage list for the required event family and access route. ## Getting started **Before you start:** Coverage is restricted to listed event pairs. 1. Read coverage and obtain canonical event or pair identifiers. 2. Choose the REST audit route or MCP connection. 3. Inspect the complete response using a covered free example. 4. Handle verdicts, individual findings and data age in the integration. 5. For metered crypto calls, configure an x402-compatible payment client and an explicit request budget. Only listed event pairs are covered; Crosswire is not a universal contract matcher. [Open the Crosswire MCP endpoint]() ## Useful links ### What to check - Coverage is restricted to listed event pairs. - The service returns settlement-compatibility data and does not execute either trading leg. - A semantic match and fee-adjusted spread do not cancel a flagged timing or void-rule difference. A closer look ## Ratings & reviews Editorial rating **3.5**/ 5 0 user reviews PredictionToolkit editorial ### Our take on Crosswire Editorial rating: 3.5/5. Structured rule comparison addresses a specific cross-venue research problem. Limited pair coverage and snapshot age prevent the verdict from serving as a universal arbitrage or execution guarantee. Based on documented features, setup and access terms. [How we rate]() ### User reviews 0 The main score switches to user ratings after 5 published reviews. **Be the first to share your experience** A specific example helps the next person choose the right tool. ## Related tools [Browse category]() ![ArbBets entry page showing cross-venue YES/NO price comparison]() [ArbBets]() Data API**3.5**Editorial Scan matched outcomes across venues and inspect sizing, prices and costs through the web app or paid API. - Access Web · API Add contract-rule comparison to an arbitrage-discovery workflow. ![PolyRouter interactive Markets API tester before request submission]() ![PolyRouter logo]()[PolyRouter]() Data API**3.5**Editorial Query markets, books, trades, price history and standardized sports data through one REST interface. - Access API · MCP Compare a unified integration for venue data. ![Scanverity resolution-risk analyzer and public example]() ![Scanverity logo]()[Scanverity]() restricted Data API**3.5**Editorial Examine rules, deadlines and resolution evidence, then monitor selected contracts for changes. - Access Web · API · Email Also in Resolution Research Tools. ## Frequently asked questions about Crosswire ### What can an audit reveal? Contracts with similar names may use different settlement sources, times, event scopes or cancellation rules. The findings identify those divergences. ### Can an agent use Crosswire? Yes. MCP exposes coverage discovery and resolution-risk checks. ### Does the verdict forecast the winner? No. It compares the contracts and their rules rather than predicting the outcome. ### What should accompany a saved result? Keep the leg identifiers, individual findings, snapshot age and ruleset hash so the decision retains its audit context. In this profile