DEX Changes

Instructions

Implementation Reference

• src/tools/dex.ts:247-273 (handler)

  The async handler function that executes the dex_changes tool logic. It calls the API endpoint /api/v1/dex/changes with 'since' and 'limit' parameters, handles errors, and returns the change feed results.

  async ({ since, limit }) => {
    const res = await apiGet<DexQueryResponse>("/api/v1/dex/changes", {
      since,
      limit: limit ?? 50,
    });
  
    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 change(s) since ${since}.`;
    const json = JSON.stringify(data, null, 2);
  
    return {
      content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
    };
  },

• src/tools/dex.ts:234-245 (schema)

  Input schema for dex_changes defined with Zod: 'since' (required ISO 8601 string) and 'limit' (optional int 1-100, default 50).

  inputSchema: {
    since: z
      .string()
      .describe("ISO 8601 timestamp to get changes since (e.g. 2026-03-01T00:00:00Z)"),
    limit: z
      .number()
      .int()
      .min(1)
      .max(100)
      .optional()
      .describe("Maximum results (default 50)"),
  },

• src/tools/dex.ts:227-274 (registration)

  Registration of the tool named 'dex_changes' via server.registerTool(), including metadata (title, description, cost info) and the input schema.

  server.registerTool(
    "dex_changes",
    {
      title: "DEX Changes",
      description:
        "Get recent changes to DEX trade data since a given timestamp. " +
        "Cost: $0.003 per query. Source: On-chain DEX analytics.",
      inputSchema: {
        since: z
          .string()
          .describe("ISO 8601 timestamp to get changes since (e.g. 2026-03-01T00:00:00Z)"),
        limit: z
          .number()
          .int()
          .min(1)
          .max(100)
          .optional()
          .describe("Maximum results (default 50)"),
      },
    },
    async ({ since, limit }) => {
      const res = await apiGet<DexQueryResponse>("/api/v1/dex/changes", {
        since,
        limit: limit ?? 50,
      });
  
      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 change(s) since ${since}.`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/index.ts:33-61 (registration)

  The parent registration: registerDexTools(server) is called at line 52, which registers the dex_changes tool among other DEX tools.

  function createMcpServer() {
    const server = new McpServer({
      name: "verilex-data",
      version: "0.3.3",
    });
  
    registerNpiTools(server);
    registerSecTools(server);
    registerPacerTools(server);
    registerWeatherTools(server);
    registerOtcTools(server);
    registerTrademarkTools(server);
    registerPatentTools(server);
    registerCompanyTools(server);
    registerCryptoTools(server);
    registerSanctionsTools(server);
    registerWhaleTools(server);
    registerLabelTools(server);
    registerHolderTools(server);
    registerDexTools(server);
    registerContractTools(server);
    registerPmTools(server);
    registerPmArbTools(server);
    registerPmResolutionTools(server);
    registerEconTools(server);
    registerPmMicroTools(server);
  
    return server;
  }

• src/client.ts:44-75 (helper)

  The apiGet helper used by the dex_changes handler to make the GET request to the Verilex API.

  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,
    };