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Tags: Finance and trading
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Oracle3: open-source trading engine and MCP server for prediction markets. Finds fee-adjusted no-arbitrage violations across related event contracts and trades them live on Kalshi, Polymarket and Solana, or on paper, under pre-trade risk limits. 13 MCP tools, JSON CLI, agent skills, 600+ tests.

Free invoice builder & GST billing software for India. Make GST invoices, quotations, bills of supply and credit notes as PDF; GSTR-1/3B reports. Free invoice maker for shops, freelancers & small businesses. Free Tally alternative: open source, 100% offline, no signup, no limits.

  • gst
  • billing-software-open-source
  • gst-billing
  • hsn-code