PropLine

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PropLine is a real-time player-props betting odds API covering 47 sports and 17 books — including Pinnacle and five exchanges (Kalshi, Polymarket, Smarkets, Matchbook, Novig) that other odds APIs don't carry. It is the only odds API that automatically resolves player props against actual box scores: every Over/Under outcome ships with won/lost/push/void plus the real stat value. Pricing is per request, not per credit. The response schema is the-odds-api-compatible, so migrating is a base-URL change. Free tier: 1,000 requests/day, no credit card. Official Python and Node SDKs, a CLI, and an MCP server so AI agents can query odds directly.