From e1e800014a64987be114e11c91824412eb4fbab3 Mon Sep 17 00:00:00 2001
From: "jatin.go" <jatin.go@media.net>
Date: Wed, 13 May 2026 17:06:13 +0530
Subject: [PATCH] feat(ai-gateway): register FastRouter as a Kilo Gateway
 upstream
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Adds FastRouter (https://fastrouter.ai) as a known upstream provider in the
Kilo Gateway. Registers 'fastrouter' in the ProviderId union and adds a
FASTROUTER entry to provider-definitions.ts. No requests are rerouted by
this change — the entry is symbolic so that future kilo-exclusive model
definitions can declare gateway: 'fastrouter'.

Companion to the kilocode-side built-in FastRouter provider PR. Closes
maintainer checklist item #2 ("Kilo Gateway: please also submit a
corresponding PR to add this provider to the Kilo Gateway") on the
original kilocode PR review.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 .env.local.example                                        | 2 ++
 apps/web/.env.test                                        | 1 +
 .../src/lib/ai-gateway/providers/kilo-exclusive-model.ts  | 8 +++++++-
 .../src/lib/ai-gateway/providers/provider-definitions.ts  | 7 +++++++
 apps/web/src/lib/ai-gateway/providers/types.ts            | 1 +
 5 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/.env.local.example b/.env.local.example
index 4f15046328..c4ae4a89ce 100644
--- a/.env.local.example
+++ b/.env.local.example
@@ -29,6 +29,8 @@ R2_CLI_SESSIONS_BUCKET_NAME=test-bucket
 # ============================================================================
 # OpenRouter (primary AI provider) - get from https://openrouter.ai/keys
 OPENROUTER_API_KEY=sk-or-v1-your-openrouter-key
+# FastRouter (alternative OpenRouter-compatible LLM gateway) - get from https://fastrouter.ai
+FASTROUTER_API_KEY=
 # Optional: Other AI providers
 OPENAI_API_KEY=sk-your-openai-key
 MISTRAL_API_KEY=your-mistral-key
diff --git a/apps/web/.env.test b/apps/web/.env.test
index 5df271d9c2..ee51df7f89 100644
--- a/apps/web/.env.test
+++ b/apps/web/.env.test
@@ -8,6 +8,7 @@ POSTGRES_URL="postgres://postgres:postgres@localhost:5432/postgres"
 POSTGRES_CONNECT_TIMEOUT=10000
 POSTGRES_MAX_QUERY_TIME=5000
 OPENROUTER_API_KEY=invalid-mock-api-key
+FASTROUTER_API_KEY=invalid-mock-api-key
 STYTCH_PROJECT_ID=test-fake-project-id
 STYTCH_PROJECT_SECRET=test-fake-project-secret
 NEXT_PUBLIC_STYTCH_PROJECT_ENV=test
diff --git a/apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.ts b/apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.ts
index 288f65c1ff..4af17886c0 100644
--- a/apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.ts
+++ b/apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.ts
@@ -67,7 +67,13 @@ export function getInferenceProvider(
   model: KiloExclusiveModel
 ): OpenRouterInferenceProviderId | null {
   if (model.flags.includes('stealth')) return 'stealth';
-  if (model.gateway === 'openrouter' || model.gateway === 'vercel') return null;
+  if (
+    model.gateway === 'openrouter' ||
+    model.gateway === 'vercel' ||
+    model.gateway === 'fastrouter'
+  ) {
+    return null;
+  }
   return OpenRouterInferenceProviderIdSchema.parse(model.gateway);
 }
 
diff --git a/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts b/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts
index 01e803d0a7..cce2a135f0 100644
--- a/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts
+++ b/apps/web/src/lib/ai-gateway/providers/provider-definitions.ts
@@ -14,6 +14,13 @@ export default {
     supportedChatApis: ['chat_completions', 'messages', 'responses'],
     transformRequest() {},
   },
+  FASTROUTER: {
+    id: 'fastrouter',
+    apiUrl: 'https://go.fastrouter.ai/api/v1',
+    apiKey: getEnvVariable('FASTROUTER_API_KEY'),
+    supportedChatApis: ['chat_completions'],
+    transformRequest() {},
+  },
   ALIBABA: {
     id: 'alibaba',
     apiUrl: 'https://dashscope-intl.aliyuncs.com/compatible-mode/v1',
diff --git a/apps/web/src/lib/ai-gateway/providers/types.ts b/apps/web/src/lib/ai-gateway/providers/types.ts
index ee7e75c028..8ac7cef1fc 100644
--- a/apps/web/src/lib/ai-gateway/providers/types.ts
+++ b/apps/web/src/lib/ai-gateway/providers/types.ts
@@ -4,6 +4,7 @@ import type { FraudDetectionHeaders } from '@/lib/utils';
 
 export type ProviderId =
   | 'openrouter'
+  | 'fastrouter'
   | 'alibaba'
   | 'seed'
   | 'direct-byok'