{"uid":"cap_C1L1snls3n7WzvYk0L7Hw","slug":"polymarketeer-vercel-app-6d7ff6b3","name":"Kalshi Market Categories List","description":"List all Kalshi market categories with active event counts","url":"https://polymarketeer.vercel.app/api/x402/kalshi/categories","method":"POST","headers":{},"bodySchema":null,"responseSchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["data"],"properties":{"data":{},"error":{"type":"string"}},"additionalProperties":false},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_TuGcmmWbmVuvxZl5io5uW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Lists all Kalshi prediction market categories along with counts of active events in each category","exampleAgentPrompt":"Show me all the categories available on Kalshi prediction markets along with how many active events are in each one.","exampleUseCases":null,"resultDescription":"A list of all Kalshi market categories, each with its name, identifier, and the count of currently active events within that category.","failureModes":["Kalshi API unavailable or rate-limited — returns 5xx or timeout","No categories found — empty list returned if Kalshi data is temporarily unavailable","Payment not processed — 402 response if USDC payment via x402 protocol fails"],"whenToPreferThis":"Use this endpoint when you need to browse or enumerate all top-level Kalshi prediction market categories, especially when building a navigation UI, filtering markets by topic, or helping a user discover what kinds of events are tradeable on Kalshi. Prefer this over search endpoints when you don't have a specific keyword and just want a high-level overview of available market types.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:40:08.780Z","isFirstParty":false}