{"id":"4a2d6a45-9008-4cd3-8619-3c5887c33a2e","shortId":"ZP7tQC","kind":"x402","title":"Polymarket structure metadata: market type detection and outcome probabilities for $0.005 USDC per call.","tagline":"Polymarket structure metadata: market type detection and outcome probabilities for $0.005 USDC per call.","description":"The `/api/v1/market-info` endpoint is part of the PolyNews Intelligence API, a prediction-market data platform serving autonomous trading agents via the x402 micropayment protocol. This specific endpoint accepts a POST request with a Polymarket event ID or slug and returns structured metadata about the market: whether it is binary or multi-outcome, along with all available outcomes and their current probabilities. It costs $0.005 USDC per call, settled on Base.\n\nPolyNews exposes a broader suite of 16 endpoints spanning free market discovery (active markets, live prices), standard-tier data (trade feeds, price history, market structure), premium Grok-AI-powered analysis (news context, catalyst detection, daily briefings), and alpha-tier signals (cross-platform Polymarket×Kalshi arbitrage, smart money detection, wallet scoring). All paid endpoints use the x402 payment protocol — the server returns HTTP 402 with USDC payment requirements, and compatible client libraries handle payment and retry automatically. No API keys or subscriptions are needed.\n\nThe `market-info` endpoint is useful as a lightweight structural lookup before committing to more expensive analysis calls. For example, an agent can confirm a market is multi-outcome and enumerate candidates before calling `/market-context` ($0.05) or `/smart-money` ($0.05) on a specific outcome. The response schema includes `marketId`, `question`, `type` (binary or multi-outcome), and an array of outcome objects each with `id`, `name`, and `price` (probability 0–1).","tags":[],"capabilities":["prediction-market-data","market-type-detection","outcome-probabilities","polymarket-integration","x402-micropayment","usdc-on-base","pay-per-call","no-api-key"],"categories":["finance","prediction-markets"],"synonyms":["polymarket market info","prediction market metadata","market structure API","polymarket outcomes","market type detection","prediction market probabilities","polymarket API"],"warnings":["No actual successful (200) response was captured; response structure is inferred from OpenAPI schema and x402 outputSchema.","The example response JSON is illustrative based on schema — actual field names in the live response may differ slightly (e.g., 'marketType' vs 'type')."],"endpointUrl":"https://polynews.news/api/v1/market-info","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6ee49a7872844397Fb52870Cc07b308fFADC9427","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://polynews.news/api/v1/market-info","description":"Market structure metadata: type detection, available outcomes with probabilities","outputSchema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{"marketId":"69317"},"discoverable":true},"output":{"type":"object","properties":{"data":{"type":"object","properties":{"outcomes":{"type":"array","items":{"type":"object","properties":{"name":{"type":"string"},"probability":{"type":"number"}}}},"marketType":{"type":"string"}}}}}},"maxAmountRequired":"5000","maxTimeoutSeconds":300}]},"qualityScore":"0.880","qualityRationale":"Full OpenAPI 3.1 schema with detailed request/response definitions, live 402 challenge captured confirming the endpoint is operational, clear pricing ($0.005 USDC), and comprehensive docs page. Minor deduction because no actual 200 response example was captured — the response shape is inferred from the schema and outputSchema in the x402 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'/market-context':224 '/smart-money':227 '0':258 '0.005':11,25,94 '0.05':225,228 '1':259 '16':107 '402':167 'accept':57 'activ':113 'agent':48,210 'ai':130 'along':83 'alpha':141 'alpha-ti':140 'analysi':132,205 'api':38,182 'arbitrag':149 'array':247 'automat':180 'autonom':46 'avail':86 'base':100 'binari':78,240 'brief':138 'broader':104 'call':14,28,97,206,223 'candid':221 'catalyst':135 'client':174 'commit':201 'compat':173 'confirm':212 'context':134 'cost':93 'cross':145 'cross-platform':144 'current':90 'daili':137 'data':43,120 'detect':6,20,136,152 'discoveri':112 'endpoint':31,56,108,157,192 'enumer':220 'event':64 'exampl':208 'expens':204 'expos':102 'feed':122 'free':110 'grok':129 'grok-ai-pow':128 'handl':176 'histori':124 'http':166 'id':65,253 'includ':236 'info':191 'intellig':37 'kalshi':148 'key':183 'librari':175 'lightweight':197 'live':115 'lookup':199 'market':4,18,42,74,111,114,125,190,214 'market structure API' 'market type detection' 'market-info':189 'market-type-detection' 'marketid':237 'metadata':3,17,71 'micropay':52 'money':151 'multi':81,217,243 'multi-outcom':80,216,242 'name':254 'need':187 'news':133 'no-api-key' 'object':250 'outcom':8,22,82,87,218,232,244,249 'outcome-probabilities' 'paid':156 'part':33 'pay-per-call' 'payment':161,170,177 'per':13,27,96 'platform':44,146 'polymarket':1,15,63,147 'polymarket API' 'polymarket market info' 'polymarket outcomes' 'polymarket-integration' 'polynew':36,101 'post':59 'power':131 'predict':41 'prediction market metadata' 'prediction market probabilities' 'prediction-market':40 'prediction-market-data' 'premium':127 'price':116,123,256 'probabl':9,23,91,257 'protocol':53,162 'question':238 'request':60 'requir':171 'respons':234 'retri':179 'return':69,165 'schema':235 'score':154 'serv':45 'server':164 'settl':98 'signal':143 'slug':67 'smart':150 'span':109 'specif':55,231 'standard':118 'standard-ti':117 'structur':2,16,70,126,198 'subscript':185 'suit':105 'tier':119,142 'trade':47,121 'type':5,19,239 'usdc':12,26,95,169 'usdc-on-base' 'use':158,194 'via':49 'wallet':153 'whether':75 'x402':51,160 'x402-micropayment'","prices":[{"id":"9c8f95b3-5d73-4180-ae72-970a41240655","listingId":"4a2d6a45-9008-4cd3-8619-3c5887c33a2e","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"5000","chain":"base","payTo":"0x6ee49a7872844397Fb52870Cc07b308fFADC9427","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6ee49a7872844397Fb52870Cc07b308fFADC9427","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://polynews.news/api/v1/market-info","description":"Market structure metadata: type detection, available outcomes with probabilities","outputSchema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{"marketId":"69317"},"discoverable":true},"output":{"type":"object","properties":{"data":{"type":"object","properties":{"outcomes":{"type":"array","items":{"type":"object","properties":{"name":{"type":"string"},"probability":{"type":"number"}}}},"marketType":{"type":"string"}}}}}},"maxAmountRequired":"5000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:35.448Z"}],"sources":[{"listingId":"4a2d6a45-9008-4cd3-8619-3c5887c33a2e","source":"x402_bazaar","sourceId":"https://polynews.news/api/v1/market-info","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:35.448Z","lastSeenAt":"2026-04-23T14:02:39.796Z"}],"details":{"listingId":"4a2d6a45-9008-4cd3-8619-3c5887c33a2e","quickStartSnippet":"curl -X POST https://polynews.news/api/v1/market-info \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"marketId\": \"69317\"}'\n# Returns 402 — use an x402 client to auto-pay $0.005 USDC on Base","exampleRequest":{"marketId":"69317"},"exampleResponse":{"data":{"outcomes":[{"name":"Gavin Newsom","probability":0.27},{"name":"Alexandria Ocasio-Cortez","probability":0.08},{"name":"Jon Ossoff","probability":0.08}],"marketType":"multi-outcome"}},"schema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{"marketId":"69317"},"discoverable":true},"output":{"type":"object","properties":{"data":{"type":"object","properties":{"outcomes":{"type":"array","items":{"type":"object","properties":{"name":{"type":"string"},"probability":{"type":"number"}}}},"marketType":{"type":"string"}}}}}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The /api/v1/market-info endpoint costs $0.005 USDC per call","source_url":"https://polynews.news/docs"},{"claim":"The endpoint returns market type detection (binary/multi-outcome) and outcomes with probabilities","source_url":"https://polynews.news/docs"},{"claim":"Payment is settled in USDC on Base to address 0x6ee49a7872844397Fb52870Cc07b308fFADC9427","source_url":"https://polynews.news/docs"},{"claim":"The x402 challenge confirms the endpoint is live with maxAmountRequired of 5000 base units (=$0.005 USDC)","source_url":"https://polynews.news/api/v1/market-info"},{"claim":"The endpoint accepts POST with a JSON body containing marketId","source_url":"https://polynews.news/docs"},{"claim":"PolyNews API requires no API keys or subscriptions — agents pay per call via x402","source_url":"https://polynews.news/docs"}],"useCases":["Look up whether a Polymarket event is binary or multi-outcome before placing trades","Enumerate all outcomes and their current probabilities for a given market","Pre-flight check before calling more expensive AI analysis or smart-money endpoints","Build automated dashboards that classify and display market structures","Agent-driven portfolio construction across prediction market outcomes"],"bestFor":["Autonomous trading agents that need structured market metadata before analysis","Developers building prediction-market tooling on Polymarket data","Workflows that chain market-info into deeper analysis (market-context, smart-money)","Low-cost structural lookups at $0.005 per call"],"notFor":["Historical price data or time-series analysis (use /price-history instead)","AI-powered news analysis or sentiment (use /market-context instead)","Non-Polymarket prediction platforms without a Polymarket event ID"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-03-02T05:37:37.477Z"},"updatedAt":"2026-04-23T14:02:39.796Z"}}