# HARS-Zero — Polymarket Prediction Market Intelligence API # x402 protocol — pay per call in USDC on Base mainnet AND Solana # Hosted by CryptoTavern — https://cryptotavern.xyz ## What this API does Real-time Polymarket market intelligence for AI agents. Three flagship signal layers: Discover (market-brief), Decide (mispricing/whale), Monitor (webhooks). All payments via HTTP 402 / x402 protocol. Multi-chain: Base + Solana. ## The Core Question Did Polymarket move enough that my agent should investigate now? ## Canonical site https://hars.cryptotavern.xyz ## Flagship Products - agent-pulse: $0.008/call — HIGH-VOLUME loop: movers + mispricings + action_items (side/edge/reason) - market-brief: $0.005/call — top 20 markets, volatility, spread - event-mispricing: $0.020/call — YES+NO gap, tradeable mispricing - whale-watch: $0.030/call — volume spikes, whale activity ## Trust Pages /docs/methodology — data sources, calculations, limitations /status — uptime, latency, freshness, supported networks /.well-known/SKILL.md — agent-readable skill manifest ## Machine-readable manifest GET /.well-known/tools.json — OpenAI function-call format GET /products — full product catalog with prices ## Free preview GET /preview/agent-pulse — decision-ready sample, no payment GET /preview/market-brief — sample output, no payment required GET /preview/event-mispricing GET /preview/whale-watch ## Solana USDC accepted (in addition to Base mainnet) Pay directly from Solana USDC SPL via x402 ExactSvmScheme. Solana wallet: 7Cjuc27ccoBZjtaoH1xv7ePE8W5ni4bTU5Y4uK3P5a2F USDC SPL mint: EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v Just include X-PAYMENT with scheme=exact network=solana:mainnet — same API, no bridging needed.