diff --git a/packages/client/workbench/src/settings/providers/__tests__/add-flow.test.tsx b/packages/client/workbench/src/settings/providers/__tests__/add-flow.test.tsx
index 461322c5..1de5d126 100644
--- a/packages/client/workbench/src/settings/providers/__tests__/add-flow.test.tsx
+++ b/packages/client/workbench/src/settings/providers/__tests__/add-flow.test.tsx
@@ -165,6 +165,40 @@ describe('non-subscription account creation', () => {
     );
   });
 
+  it('offers a dedicated StepFun API key entry', async () => {
+    const onPick = vi.fn();
+    render(<ServiceCatalogView onPick={onPick} />);
+    fireEvent.click(screen.getByText('serviceName.stepfun'));
+    expect(onPick).toHaveBeenCalledWith('stepfun');
+    cleanup();
+
+    const onSubmit = vi.fn();
+    render(
+      <AddAccountForm
+        serviceId="stepfun"
+        runtimes={undefined}
+        onboarding={onboarding()}
+        busy={false}
+        onBack={vi.fn()}
+        onSubmit={onSubmit}
+      />,
+    );
+
+    const secret = document.querySelector<HTMLInputElement>('input[type="password"]');
+    if (!secret) throw new Error('credential input missing');
+    fireEvent.change(secret, { target: { value: 'stepfun-test-key' } });
+    fireEvent.click(screen.getByRole('button', { name: 'form.submit' }));
+
+    await waitFor(() =>
+      expect(onSubmit).toHaveBeenCalledWith(
+        expect.objectContaining({
+          service: 'stepfun',
+          credential: { type: 'api-key', key: 'stepfun-test-key' },
+        }),
+      ),
+    );
+  });
+
   it('asks nothing about protocol for a service serving several shapes', () => {
     render(
       <AddAccountForm
diff --git a/packages/foundation/providers/src/__tests__/resolve.test.ts b/packages/foundation/providers/src/__tests__/resolve.test.ts
index 660ddafa..717db513 100644
--- a/packages/foundation/providers/src/__tests__/resolve.test.ts
+++ b/packages/foundation/providers/src/__tests__/resolve.test.ts
@@ -135,6 +135,35 @@ describe('resolveBinding: variant chosen per agent', () => {
     });
   });
 
+  it('routes a StepFun key over each supported native protocol', () => {
+    const stepfun = account({ service: 'stepfun' });
+    expect(resolveBinding(stepfun, 'claude-code')).toEqual({
+      tier: 'native',
+      protocol: 'anthropic',
+      baseUrl: 'https://api.stepfun.com',
+    });
+    expect(resolveBinding(stepfun, 'codex')).toEqual({
+      tier: 'native',
+      protocol: 'openai-responses',
+      baseUrl: 'https://api.stepfun.com/v1',
+    });
+    expect(resolveBinding(stepfun, 'opencode')).toEqual({
+      tier: 'native',
+      protocol: 'openai-chat',
+      baseUrl: 'https://api.stepfun.com/v1',
+      knownProvider: 'stepfun',
+    });
+    expect(resolveBinding(stepfun, 'pi')).toEqual({
+      tier: 'native',
+      protocol: 'anthropic',
+      baseUrl: 'https://api.stepfun.com',
+    });
+    expect(resolveBinding(stepfun, 'grok-build')).toEqual({
+      tier: 'unavailable',
+      reason: 'protocol-unsupported',
+    });
+  });
+
   it('reaches codex on every service whose endpoint serves the Responses API', () => {
     // Verified against vendor docs 2026-08: xAI, OpenRouter and Vercel all serve POST /responses
     // at the base URL declared here, so codex must have a target on each.
@@ -305,6 +334,10 @@ describe('catalog helpers', () => {
       url: 'https://api.deepseek.com/models',
       wire: 'openai',
     });
+    expect(modelListSource('stepfun')).toEqual({
+      url: 'https://api.stepfun.com/v1/models',
+      wire: 'openai',
+    });
     expect(modelListSource('anthropic-api')?.wire).toBe('anthropic');
     expect(modelListSource('linkcode-gateway')).toEqual({
       url: 'https://gateway.linkcode.ai/v1/models',
diff --git a/packages/foundation/providers/src/catalog.ts b/packages/foundation/providers/src/catalog.ts
index 0dd7653d..c375ce20 100644
--- a/packages/foundation/providers/src/catalog.ts
+++ b/packages/foundation/providers/src/catalog.ts
@@ -133,6 +133,24 @@ export const SERVICE_CATALOG: ServiceDescriptor[] = [
     models: { url: 'https://api.deepseek.com/models', wire: 'openai' },
     secretPlaceholder: 'sk-…',
   },
+  {
+    id: 'stepfun',
+    label: 'StepFun',
+    group: 'direct',
+    kind: 'endpoint',
+    credentialType: 'api-key',
+    variants: {
+      anthropic: { baseUrl: 'https://api.stepfun.com' },
+      // Responses serves `step-3.7-flash` only (2026-08).
+      'openai-responses': { baseUrl: 'https://api.stepfun.com/v1' },
+      'openai-chat': {
+        baseUrl: 'https://api.stepfun.com/v1',
+        knownProvider: { opencode: 'stepfun' },
+      },
+    },
+    models: { url: 'https://api.stepfun.com/v1/models', wire: 'openai' },
+    secretPlaceholder: 'sk-…',
+  },
   {
     id: LINKCODE_GATEWAY_SERVICE_ID,
     label: 'LinkCode Gateway',
diff --git a/packages/presentation/i18n/src/locales/en.ts b/packages/presentation/i18n/src/locales/en.ts
index 56de73e2..6afb6446 100644
--- a/packages/presentation/i18n/src/locales/en.ts
+++ b/packages/presentation/i18n/src/locales/en.ts
@@ -1116,6 +1116,7 @@ export const en = {
         'openai-api': 'OpenAI API',
         xai: 'xAI (Grok)',
         deepseek: 'DeepSeek',
+        stepfun: 'StepFun',
         openrouter: 'OpenRouter',
         'vercel-gateway': 'Vercel AI Gateway',
         'cloudflare-gateway': 'Cloudflare AI Gateway',
@@ -1130,6 +1131,7 @@ export const en = {
         'openai-api': 'A key from platform.openai.com',
         xai: 'A key from console.x.ai',
         deepseek: 'A key from platform.deepseek.com',
+        stepfun: 'A key from platform.stepfun.com',
         'linkcode-gateway': 'Use LinkCode credits without bringing an API key',
         openrouter: 'Aggregation gateway',
         'vercel-gateway': 'Server-side translating gateway',
diff --git a/packages/presentation/i18n/src/locales/zh-cn.ts b/packages/presentation/i18n/src/locales/zh-cn.ts
index ea900389..6dda1827 100644
--- a/packages/presentation/i18n/src/locales/zh-cn.ts
+++ b/packages/presentation/i18n/src/locales/zh-cn.ts
@@ -1089,6 +1089,7 @@ export const zhCN = {
         'openai-api': 'OpenAI API',
         xai: 'xAI(Grok)',
         deepseek: 'DeepSeek',
+        stepfun: '阶跃星辰 StepFun',
         openrouter: 'OpenRouter',
         'vercel-gateway': 'Vercel AI Gateway',
         'cloudflare-gateway': 'Cloudflare AI Gateway',
@@ -1103,6 +1104,7 @@ export const zhCN = {
         'openai-api': 'platform.openai.com 的密钥',
         xai: 'console.x.ai 的密钥',
         deepseek: 'platform.deepseek.com 的密钥',
+        stepfun: 'platform.stepfun.com 的密钥',
         'linkcode-gateway': '无需自带 API 密钥，直接使用 LinkCode 额度',
         openrouter: '聚合网关',
         'vercel-gateway': '服务端翻译网关',
diff --git a/packages/presentation/ui/src/shell/service-icon.tsx b/packages/presentation/ui/src/shell/service-icon.tsx
index 6a72d3c5..5c011a89 100644
--- a/packages/presentation/ui/src/shell/service-icon.tsx
+++ b/packages/presentation/ui/src/shell/service-icon.tsx
@@ -6,6 +6,7 @@ import CloudflareColorGlyph from '~icons/lobe-icons/cloudflare-color';
 import DeepSeekColorGlyph from '~icons/lobe-icons/deepseek-color';
 import OpenAiGlyph from '~icons/lobe-icons/openai';
 import OpenRouterGlyph from '~icons/lobe-icons/openrouter';
+import StepFunColorGlyph from '~icons/lobe-icons/stepfun-color';
 import VercelGlyph from '~icons/lobe-icons/vercel';
 import XaiGlyph from '~icons/lobe-icons/xai';
 import { cn } from '../lib/cn';
@@ -32,6 +33,7 @@ const SERVICE_GLYPHS: Record<string, typeof AnthropicGlyph> = {
   'openai-api': OpenAiGlyph,
   xai: XaiGlyph,
   deepseek: DeepSeekColorGlyph,
+  stepfun: StepFunColorGlyph,
   openrouter: OpenRouterGlyph,
   'vercel-gateway': VercelGlyph,
   'cloudflare-gateway': CloudflareColorGlyph,