{"uid":"cap_moDfNaToy90CPv20Z1hmZ","slug":"hars-zero-signal-api-historical-momentum-91c52c33","name":"HARS-Zero Signal API – Historical Momentum","description":"Polymarket prediction-market intelligence for AI agents. Pay-per-call in USDC via x402 protocol. Multi-chain: Base + Solana.","url":"https://hars.cryptotavern.xyz/paid/historical-momentum","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"object","example":{"count":0,"markets":[]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","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":"$0.051/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.051","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.051","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_g92weYb7JO7GA3orZU-bd","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.051","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns historical momentum signals for Polymarket prediction markets, helping AI agents identify trending or momentum-driven markets","exampleAgentPrompt":"Pull the historical momentum signal from HARS-Zero for Polymarket and show me which markets are currently showing the strongest momentum trends.","exampleUseCases":[{"title":"Momentum-based trading signal research","prompt":"I want to see which Polymarket prediction markets have been building the most momentum historically — can you pull the HARS-Zero historical momentum data and list the top markets?"},{"title":"Pre-trade market selection for prediction markets","prompt":"Before I place a bet on Polymarket, show me the markets with strong historical momentum signals so I can focus on the ones with the clearest directional trend."},{"title":"Automated prediction market monitoring","prompt":"Check the HARS-Zero historical momentum endpoint and alert me if any Polymarket markets are showing unusual momentum buildup compared to their historical baseline."}],"resultDescription":"Returns a JSON object containing a count of matched markets and an array of market objects with historical momentum signal data from Polymarket, indicating which markets have notable momentum characteristics.","failureModes":["Empty markets array with count 0 if no markets match the provided filter criteria","Payment failure via x402 protocol if USDC balance is insufficient","HTTP 402 if payment is not included or invalid","Rate limiting or timeout if the upstream Polymarket data source is unavailable","Malformed input properties may result in no results rather than an explicit error"],"whenToPreferThis":"Choose this endpoint when you need historical momentum signals specifically from Polymarket prediction markets and want a pay-per-call model with no subscription commitment. Prefer this over direct Polymarket API access when you need pre-processed momentum analytics rather than raw market data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:34:01.550Z","isFirstParty":false}