diff --git a/README.md b/README.md
index 52993a4..1a105e2 100644
--- a/README.md
+++ b/README.md
@@ -1,31 +1,70 @@
 # opencodex-fast
 
-An OpenCode plugin that adds `"service_tier": "priority"` to Codex requests when `/fast` is enabled globally.
+An OpenCode plugin that adds `"service_tier": "priority"` to matching requests when `/fast` is enabled.
 
-## What it does
+## What It Does
 
 - Adds a `/fast` command to OpenCode
-- When enabled, injects `service_tier: "priority"` into requests sent to `https://chatgpt.com/backend-api/codex/responses`
-- Mirrors Codex Fast mode, which is documented as 1.5x faster at 2x credit cost
-- Leaves all non-Codex requests untouched
-- Persists a single global `enabled` flag in `~/.config/opencode/opencodex-fast.jsonc`
+- By default, injects `service_tier: "priority"` into requests whose URL contains `/backend-api/codex/responses`
+- Supports additional third-party URL prefixes through plugin options in `opencode.json`
+- Leaves all other requests untouched
+- Supports configuring startup `enabled` state in plugin options
+- Keeps backward compatibility with `~/.config/opencode/opencodex-fast.jsonc`
 
 ## Commands
 
 ```text
-/fast           Toggle fast mode globally
+/fast           Toggle fast mode
 /fast on        Enable fast mode
 /fast off       Disable fast mode
-/fast status    Show current global fast-mode state
+/fast status    Show current fast-mode state
 ```
 
 ## Installation
 
-Add to your OpenCode config:
+Add the plugin to your OpenCode config:
 
-```jsonc
-// opencode.jsonc
+```json
 {
-  "plugin": ["opencodex-fast@latest"],
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": ["opencodex-fast@latest"]
 }
 ```
+
+## Configuration
+
+You can pass plugin options directly on the `opencodex-fast` plugin entry in `opencode.json`:
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": [
+    "@example-org/one-plugin",
+    [
+      "opencodex-fast@latest",
+      {
+        "enabled": true,
+        "extraUrlPrefixes": [
+          "https://third-party.example.com/v1",
+          "https://proxy.example.com/backend-api/codex/responses"
+        ]
+      }
+    ],
+    "@example-org/another-plugin"
+  ]
+}
+```
+
+### Options
+
+- `enabled`: starts OpenCode with fast mode already enabled so you do not need to run `/fast` manually
+- `extraUrlPrefixes`: additional URL prefixes to match for priority injection, such as a provider `baseUrl` or a more specific endpoint URL; these are added on top of the built-in Codex matcher, not used instead of it
+
+### Behavior Notes
+
+- The built-in Codex matcher `/backend-api/codex/responses` is always kept; `extraUrlPrefixes` only adds more matches
+- Use a provider `baseUrl` for broader matching, or a more specific endpoint URL prefix for tighter matching
+- If plugin config sets `enabled`, that value takes precedence on startup
+- If plugin config does not set `enabled`, the plugin falls back to `~/.config/opencode/opencodex-fast.jsonc`
+- `/fast` still updates the current session and writes the state file for backward compatibility
+- When plugin config sets `enabled`, restarting OpenCode restores the configured value even if `/fast` changed it during the previous session
diff --git a/index.ts b/index.ts
index 19c30df..7cf0f0e 100644
--- a/index.ts
+++ b/index.ts
@@ -7,8 +7,10 @@ import {
 } from "node:fs";
 import { homedir } from "node:os";
 import { dirname, join } from "node:path";
-import type { Plugin } from "@opencode-ai/plugin";
+import type { Plugin, PluginInput } from "@opencode-ai/plugin";
+import type { Config, Part } from "@opencode-ai/sdk";
 
+const DEFAULT_CODEX_URL_MATCHER = "/backend-api/codex/responses";
 const FAST_ON_MESSAGE = "Fast mode is now ON.";
 const FAST_OFF_MESSAGE = "Fast mode is now OFF.";
 const FAST_HANDLED_ERROR = "__FAST_HANDLED__";
@@ -18,7 +20,14 @@ const STATE_PATH = join(
     "opencodex-fast.jsonc",
 );
 
+type FastPluginOptions = {
+    enabled?: unknown;
+    extraUrlPrefixes?: unknown;
+};
+
 let fastEnabled = false;
+let configuredEnabled: boolean | undefined;
+let extraUrlPrefixes: string[] = [];
 
 function ensureStateDir(): void {
     mkdirSync(dirname(STATE_PATH), { recursive: true });
@@ -30,8 +39,33 @@ function resolveUrl(input: any): string {
     return input?.url ?? "";
 }
 
-function isCodexUrl(url: string): boolean {
-    return url.includes("/backend-api/codex/responses");
+function normalizeUrlPrefixList(input: unknown): string[] {
+    if (!Array.isArray(input)) return [];
+
+    return input
+        .filter((value): value is string => typeof value === "string")
+        .map((value) => value.trim())
+        .filter(Boolean);
+}
+
+function trimTrailingSlashes(value: string): string {
+    return value.replace(/\/+$/, "");
+}
+
+function matchesUrlPrefix(url: string, prefix: string): boolean {
+    const normalizedUrl = trimTrailingSlashes(url);
+    const normalizedPrefix = trimTrailingSlashes(prefix);
+    return (
+        normalizedUrl === normalizedPrefix ||
+        normalizedUrl.startsWith(`${normalizedPrefix}?`) ||
+        normalizedUrl.startsWith(`${normalizedPrefix}#`) ||
+        normalizedUrl.startsWith(`${normalizedPrefix}/`)
+    );
+}
+
+function matchesConfiguredUrl(url: string): boolean {
+    if (url.includes(DEFAULT_CODEX_URL_MATCHER)) return true;
+    return extraUrlPrefixes.some((prefix) => matchesUrlPrefix(url, prefix));
 }
 
 function parseBody(body: unknown): Record<string, unknown> | null {
@@ -71,9 +105,33 @@ function readState(): boolean {
     }
 }
 
+function resolveConfiguredEnabled(options: FastPluginOptions | undefined):
+    | boolean
+    | undefined {
+    return typeof options?.enabled === "boolean" ? options.enabled : undefined;
+}
+
+function resolveInitialEnabled(options: FastPluginOptions | undefined): boolean {
+    const enabled = resolveConfiguredEnabled(options);
+    if (enabled !== undefined) return enabled;
+    return readState();
+}
+
+function resolveExtraUrlPrefixes(
+    options: FastPluginOptions | undefined,
+): string[] {
+    return Array.from(new Set(normalizeUrlPrefixList(options?.extraUrlPrefixes)));
+}
+
+function appendConfigNote(message: string): string {
+    if (configuredEnabled === undefined) return message;
+    if (fastEnabled === configuredEnabled) return message;
+    return `${message} Restart will restore the plugin-configured ${configuredEnabled ? "ON" : "OFF"} state.`;
+}
+
 function maybeInjectPriority(init: any, input: any): any {
     const url = resolveUrl(input);
-    if (!isCodexUrl(url)) return init;
+    if (!matchesConfiguredUrl(url)) return init;
     if (!fastEnabled) return init;
 
     const body = parseBody(init?.body);
@@ -115,32 +173,35 @@ function getFastMessage(modeArg?: string): string {
     if (normalized === "on") {
         fastEnabled = true;
         writeState(true);
-        return FAST_ON_MESSAGE;
+        return appendConfigNote(FAST_ON_MESSAGE);
     }
 
     if (normalized === "off") {
         fastEnabled = false;
         writeState(false);
-        return FAST_OFF_MESSAGE;
+        return appendConfigNote(FAST_OFF_MESSAGE);
     }
 
     if (normalized === "status") {
-        return fastEnabled ? FAST_ON_MESSAGE : FAST_OFF_MESSAGE;
+        return appendConfigNote(fastEnabled ? FAST_ON_MESSAGE : FAST_OFF_MESSAGE);
     }
 
     if (fastEnabled) {
         fastEnabled = false;
         writeState(false);
-        return FAST_OFF_MESSAGE;
+        return appendConfigNote(FAST_OFF_MESSAGE);
     }
 
     fastEnabled = true;
     writeState(true);
-    return FAST_ON_MESSAGE;
+    return appendConfigNote(FAST_ON_MESSAGE);
 }
 
-const plugin: Plugin = async (ctx) => {
-    fastEnabled = readState();
+const plugin = (async (ctx: PluginInput, options?: unknown) => {
+    const fastOptions = options as FastPluginOptions | undefined;
+    configuredEnabled = resolveConfiguredEnabled(fastOptions);
+    fastEnabled = resolveInitialEnabled(fastOptions);
+    extraUrlPrefixes = resolveExtraUrlPrefixes(fastOptions);
     const originalFetch = globalThis.fetch;
 
     globalThis.fetch = async (input: any, init?: any) => {
@@ -149,17 +210,17 @@ const plugin: Plugin = async (ctx) => {
     };
 
     return {
-        config: async (opencodeConfig) => {
+        config: async (opencodeConfig: Config) => {
             opencodeConfig.command ??= {};
             opencodeConfig.command["fast"] = {
                 template: "[on|off|status]",
-                description: "Toggle Codex priority service tier injection",
+                description: "Toggle priority service tier injection",
             };
         },
 
         "command.execute.before": async (
             input: { command: string; sessionID: string; arguments: string },
-            _output: { parts: any[] },
+            _output: { parts: Part[] },
         ) => {
             if (input.command !== "fast") {
                 return;
@@ -170,6 +231,6 @@ const plugin: Plugin = async (ctx) => {
             throw new Error(FAST_HANDLED_ERROR);
         },
     };
-};
+}) as Plugin;
 
 export default plugin;
diff --git a/package-lock.json b/package-lock.json
index 6742618..6fb24de 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.1.1",
       "devDependencies": {
         "@opencode-ai/plugin": "^1.1.49",
+        "@opencode-ai/sdk": "^1.3.3",
         "@types/node": "^25.1.0",
         "typescript": "^5.9.3"
       },
diff --git a/package.json b/package.json
index 8bb86f9..815acbe 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
   },
   "devDependencies": {
     "@opencode-ai/plugin": "^1.1.49",
+    "@opencode-ai/sdk": "^1.3.3",
     "@types/node": "^25.1.0",
     "typescript": "^5.9.3"
   }