Query DEX Trades

Instructions

Implementation Reference

• src/tools/dex.ts:67-97 (handler)

  The async handler function that executes the query_dex_trades tool. Calls apiGet to fetch DEX trades from /api/v1/dex/trades with optional filters (pair, chain, dex, min_usd, limit), formats the response as text, and handles errors.

    async ({ pair, chain, dex, min_usd, limit }) => {
      const res = await apiGet<DexQueryResponse>("/api/v1/dex/trades", {
        pair,
        chain,
        dex,
        min_usd,
        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} DEX trade(s).`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/tools/dex.ts:41-65 (schema)

  Input schema for query_dex_trades defined via Zod. Defines optional parameters: pair (string), chain (enum of ethereum/arbitrum/polygon/base/bsc), dex (string), min_usd (number), and limit (integer 1-100, default 25).

  inputSchema: {
    pair: z
      .string()
      .optional()
      .describe("Trading pair (e.g. WETH-USDC)"),
    chain: z
      .enum(["ethereum", "arbitrum", "polygon", "base", "bsc"])
      .optional()
      .describe("Filter by blockchain network"),
    dex: z
      .string()
      .optional()
      .describe("Filter by DEX protocol (e.g. uniswap_v3, sushiswap)"),
    min_usd: z
      .number()
      .optional()
      .describe("Minimum trade size in USD"),
    limit: z
      .number()
      .int()
      .min(1)
      .max(100)
      .optional()
      .describe("Maximum results (default 25)"),
  },

• src/tools/dex.ts:32-97 (registration)

  Registration of the tool named 'query_dex_trades' via server.registerTool() inside the registerDexTools() function, with title 'Query DEX Trades', description, inputSchema, and the handler callback.

  server.registerTool(
    "query_dex_trades",
    {
      title: "Query DEX Trades",
      description:
        "Get recent swap transactions on decentralized exchanges. Filter by trading pair, " +
        "chain, minimum size, and DEX protocol. Returns trade details including price, " +
        "size, slippage, and maker/taker addresses. " +
        "Cost: $0.003 per query. Source: On-chain DEX analytics.",
      inputSchema: {
        pair: z
          .string()
          .optional()
          .describe("Trading pair (e.g. WETH-USDC)"),
        chain: z
          .enum(["ethereum", "arbitrum", "polygon", "base", "bsc"])
          .optional()
          .describe("Filter by blockchain network"),
        dex: z
          .string()
          .optional()
          .describe("Filter by DEX protocol (e.g. uniswap_v3, sushiswap)"),
        min_usd: z
          .number()
          .optional()
          .describe("Minimum trade size in USD"),
        limit: z
          .number()
          .int()
          .min(1)
          .max(100)
          .optional()
          .describe("Maximum results (default 25)"),
      },
    },
    async ({ pair, chain, dex, min_usd, limit }) => {
      const res = await apiGet<DexQueryResponse>("/api/v1/dex/trades", {
        pair,
        chain,
        dex,
        min_usd,
        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} DEX trade(s).`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/index.ts:52-52 (registration)

  Top-level registration call: registerDexTools(server) is invoked from the main MCP server setup in src/index.ts.

  registerDexTools(server);

• src/client.ts:44-76 (helper)

  The apiGet helper function used by the handler to make HTTP GET requests to the Verilex API server.

  export async function apiGet<T = unknown>(
    path: string,
    params?: Record<string, string | number | undefined>,
  ): Promise<ApiResponse<T>> {
    const url = buildUrl(path, params);
  
    const headers: Record<string, string> = {
      Accept: "application/json",
      "User-Agent": "verilex-mcp-server/0.1.0",
    };
  
    // Forward x402 payment token if present in env (for paid endpoints)
    const paymentToken = process.env.VERILEX_PAYMENT_TOKEN;
    if (paymentToken) {
      headers["X-Payment-Token"] = paymentToken;
    }
  
    const res = await fetch(url, { headers });
    const data = (await res.json()) as T;
  
    const stale = res.headers.get("X-Data-Stale");
    const lastUpdated = res.headers.get("X-Data-Last-Updated");
    const ageSeconds = res.headers.get("X-Data-Age-Seconds");
  
    return {
      ok: res.ok,
      status: res.status,
      data,
      stale: stale === "true",
      lastUpdated: lastUpdated ?? undefined,
      ageSeconds: ageSeconds ? Number(ageSeconds) : undefined,
    };
  }