Polymarket Arbitrage Opportunities

Instructions

Implementation Reference

• src/tools/pm_arb.ts:58-86 (handler)

  The async handler function that executes the pm_arb_opportunities tool logic. It calls the API endpoint /api/v1/pm/arb/opportunities with parameters min_spread, market_id, and limit, then returns formatted results.

    async ({ min_spread, market_id, limit }) => {
      const res = await apiGet<PmArbQueryResponse>("/api/v1/pm/arb/opportunities", {
        min_spread: min_spread ?? 0.05,
        market_id,
        limit: limit ?? 25,
      });
  
      if (!res.ok) {
        return {
          content: [
            {
              type: "text" as const,
              text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
            },
          ],
          isError: true,
        };
      }
  
      const { count, data } = res.data;
      const warn = stalenessWarning(res);
      const summary = `${warn}Found ${count} arbitrage opportunity/opportunities.`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/tools/pm_arb.ts:38-56 (schema)

  Input schema for pm_arb_opportunities using Zod validation: min_spread (0-1, optional), market_id (string, optional), limit (int 1-100, optional).

  inputSchema: {
    min_spread: z
      .number()
      .min(0)
      .max(1)
      .optional()
      .describe("Minimum spread threshold (0-1, default 0.05)"),
    market_id: z
      .string()
      .optional()
      .describe("Filter by specific market ID"),
    limit: z
      .number()
      .int()
      .min(1)
      .max(100)
      .optional()
      .describe("Maximum results (default 25)"),
  },

• src/tools/pm_arb.ts:30-86 (registration)

  Registration of the tool via server.registerTool() with name 'pm_arb_opportunities', title, description, inputSchema, and the handler callback.

  server.registerTool(
    "pm_arb_opportunities",
    {
      title: "Polymarket Arbitrage Opportunities",
      description:
        "Get cross-market arbitrage opportunities on Polymarket. Shows price spreads " +
        "between correlated markets, implied probability mismatches, and estimated profit. " +
        "Cost: $0.01 per query. Source: Polymarket spread analysis.",
      inputSchema: {
        min_spread: z
          .number()
          .min(0)
          .max(1)
          .optional()
          .describe("Minimum spread threshold (0-1, default 0.05)"),
        market_id: z
          .string()
          .optional()
          .describe("Filter by specific market ID"),
        limit: z
          .number()
          .int()
          .min(1)
          .max(100)
          .optional()
          .describe("Maximum results (default 25)"),
      },
    },
    async ({ min_spread, market_id, limit }) => {
      const res = await apiGet<PmArbQueryResponse>("/api/v1/pm/arb/opportunities", {
        min_spread: min_spread ?? 0.05,
        market_id,
        limit: limit ?? 25,
      });
  
      if (!res.ok) {
        return {
          content: [
            {
              type: "text" as const,
              text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
            },
          ],
          isError: true,
        };
      }
  
      const { count, data } = res.data;
      const warn = stalenessWarning(res);
      const summary = `${warn}Found ${count} arbitrage opportunity/opportunities.`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/index.ts:55-55 (registration)

  Where the registerPmArbTools function is called to register the tool on the MCP server.

  registerPmArbTools(server);

• src/tools/pm_arb.ts:14-14 (helper)

  The PmArbQueryResponse interface used to type the API response for the handler.

  interface PmArbQueryResponse {