{"domain":"bellwether.markets","name":"Bellwether","url":"https://inite.ai/en/atlas/bellwether.markets","site":"https://bellwether.markets","summary":"Normalizes Kalshi and Polymarket markets, prices and volumes into one schema, and matches same-event contracts across both venues with price spreads.","forWhom":"Independent developers and AI agents building on Kalshi and Polymarket prediction market data","useCases":["find price spreads for the same event across Kalshi and Polymarket","list and search open markets across both venues","let AI agents query markets and spreads via MCP tools"],"categories":[],"pricing":{"model":"freemium","freeTier":true,"startsAt":{"amount":49,"currency":"USD","per":"month"},"page":"https://bellwether.markets/#pricing","readOn":"2026-10-26"},"priceMoves":[],"interfaces":{"readOn":"2026-10-26","apiDocs":"https://bellwether.markets/docs","openapi":{"url":"https://bellwether.markets/openapi.json","paths":4,"title":"Bellwether"},"mcp":[{"name":"markets.bellwether/prediction-markets","tie":"namespace","registered":true,"remotes":["https://api.bellwether.markets/mcp"],"packages":[],"probe":{"state":"open","checkedOn":"2026-10-26","toolCount":3,"tools":["list_markets","get_market","matching_markets"],"serverName":"bellwether"}}],"mcpServerCard":null,"status":null},"mcpMeasured":{"server":"https://api.bellwether.markets/mcp","checkedSince":"2026-10-26","dailyChecks":2,"uptimePercent":null,"medianMs":499,"signIn":"none","clientRegistration":null,"tools":3,"contextTokens":241,"definitionsGrade":"C","definitionsScore":67,"typedResults":2,"failingChecks":{"params_described":3,"annotations":3},"warnings":{},"coverage":{"share":1,"cases":[{"useCase":"find price spreads for the same event across Kalshi and Polymarket","verdict":"covered","firstTool":"matching_markets","checks":null},{"useCase":"list and search open markets across both venues","verdict":"covered","firstTool":"list_markets","checks":null},{"useCase":"let AI agents query markets and spreads via MCP tools","verdict":"covered","firstTool":"list_markets","checks":null}]},"adoption":{"npmWeekly":null,"pypiWeekly":null,"githubStars":null},"score":null,"advice":{"verdict":"unproven","why":["its tools do every use case checked: \"find price spreads for the same event across Kalshi and Polymarket\", \"list and search open markets across both venues\", \"let AI agents query markets and spreads via MCP tools\"","checked on 2 of the 7 days it takes to judge reliability"],"how":["for \"find price spreads for the same event across Kalshi and Polymarket\", the likely first call is matching_markets","for \"list and search open markets across both venues\", the likely first call is list_markets","for \"let AI agents query markets and spreads via MCP tools\", the likely first call is list_markets","parameters are untyped or undescribed in 3 of 3 tools: check arguments before calling"]},"method":"https://inite.ai/en/atlas/mcp/report"},"connect":{"order":["mcp","openapi","apiDocs"],"mcp":[{"name":"markets.bellwether/prediction-markets","url":"https://api.bellwether.markets/mcp","answers":"open","checkedOn":"2026-10-26","weakTie":false,"registry":"https://registry.modelcontextprotocol.io/v0/servers?search=markets.bellwether%2Fprediction-markets","config":{"mcpServers":{"bellwether":{"url":"https://api.bellwether.markets/mcp"}}},"install":{"transport":"http","claudeCode":"claude mcp add --transport http bellwether https://api.bellwether.markets/mcp","cursor":"cursor://anysphere.cursor-deeplink/mcp/install?name=bellwether&config=eyJ1cmwiOiJodHRwczovL2FwaS5iZWxsd2V0aGVyLm1hcmtldHMvbWNwIn0%3D","vscode":"vscode:mcp/install?%7B%22name%22%3A%22bellwether%22%2C%22type%22%3A%22http%22%2C%22url%22%3A%22https%3A%2F%2Fapi.bellwether.markets%2Fmcp%22%7D","connector":{"url":"https://api.bellwether.markets/mcp","note":"Add it as a custom connector in the client’s settings; the client opens the sign-in itself when the server asks for one."}}}],"openapi":{"url":"https://bellwether.markets/openapi.json","paths":4},"apiDocs":"https://bellwether.markets/docs","llmsTxt":null,"status":null,"readOn":"2026-10-26"},"trust":{"readOn":"2026-10-26","certifications":[],"training":null},"used":0,"alive":100,"traits":{"buyer":"developer","deployment":"saas-only","developerFocus":true,"readAt":"2026-10-26"},"verifiedPlans":null,"fromVendor":null}