fix(proxy): lazy debug eval in route.ts, keep headers as plain objects

- route.ts debug flag was captured at import time (before cli.ts sets
  X402_PROXY_DEBUG), so dbg() never fired. Now checks env var per call.
- injectPayerHeader kept headers as Record<string,string> instead of
  converting to Headers instance, avoiding mppx headers-spreading bug.
- --debug on claude command now sets quiet:false so proxy logs show.

Author: tenequm

packages/x402-proxy/src/commands/claude.ts

@@ -84,14 +84,16 @@ Examples:
     },
   },
   async func(flags, ...rawClaudeArgs) {
+    const debug = process.env.X402_PROXY_DEBUG === "1";
     const started = await startServeServer({
       upstreamUrl: flags.upstream ?? DEFAULT_SURF_UPSTREAM_URL,
       port: Number(flags.port),
       protocol: flags.protocol ?? "mpp",
       network: flags.network,
       evmKey: flags.evmKey,
       solanaKey: flags.solanaKey,
-      quiet: true,
+      quiet: !debug,
+      debug,
     });
 
     const claudeArgs = normalizeClaudeArgs(rawClaudeArgs);

packages/x402-proxy/src/commands/serve.ts

@@ -32,6 +32,7 @@ export type StartServeServerOptions = {
   evmKey?: string;
   solanaKey?: string;
   quiet?: boolean;
+  debug?: boolean;
 };
 
 type StartedServeServer = {
@@ -119,6 +120,7 @@ function createRequestHandler(
 export async function startServeServer(
   options: StartServeServerOptions = {},
 ): Promise<StartedServeServer> {
+  if (options.debug) options.quiet = false;
   const config = loadConfig();
   const wallet = await resolveWalletForServe(options);
   const resolvedProtocol = resolveProtocol(options.protocol ?? config?.preferredProtocol);

packages/x402-proxy/src/handler.ts

@@ -163,9 +163,11 @@ export async function createMppProxyHandler(opts: {
   const payerAddress = account.address;
 
   function injectPayerHeader(init?: RequestInit): RequestInit {
-    const headers = new Headers(init?.headers);
-    headers.set("X-Payer-Address", payerAddress);
-    return { ...init, headers };
+    const existing =
+      init?.headers instanceof Headers
+        ? Object.fromEntries(init.headers.entries())
+        : ((init?.headers as Record<string, string> | undefined) ?? {});
+    return { ...init, headers: { ...existing, "X-Payer-Address": payerAddress } };
   }
 
   // Lazy session creation - only needed for SSE streaming

packages/x402-proxy/src/openclaw/route.ts

@@ -5,9 +5,8 @@ import { appendHistory } from "../history.js";
 import type { ResolvedProviderConfig } from "./defaults.js";
 import { type ModelEntry, parseMppAmount, paymentAmount, SOL_MAINNET } from "./tools.js";
 
-const debug = process.env.X402_PROXY_DEBUG === "1";
 function dbg(msg: string): void {
-  if (debug) process.stderr.write(`[x402-proxy] ${msg}\n`);
+  if (process.env.X402_PROXY_DEBUG === "1") process.stderr.write(`[x402-proxy] ${msg}\n`);
 }
 
 export type InferenceProxyRouteOptions = {