diff --git a/PLAN.md b/PLAN.md
index 7d55772..3dc41a9 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -413,7 +413,7 @@ Integrated into the fight viewer:
 - [x] Fight schedule / card system
 - [x] Commentary engine
 - [x] Achievement system
-- [ ] API docs page
+- [x] API docs page
 
 ### Phase 4: Go Live
 - [ ] Docker containerization
diff --git a/frontend/src/components/NavBar.vue b/frontend/src/components/NavBar.vue
index 6c6a8e1..9df2e4e 100644
--- a/frontend/src/components/NavBar.vue
+++ b/frontend/src/components/NavBar.vue
@@ -11,6 +11,7 @@ const links = [
   { to: '/join', label: 'FIGHT!' },
   { to: '/arena', label: 'WATCH' },
   { to: '/leaderboard', label: 'RANKINGS' },
+  { to: '/docs', label: 'DOCS' },
 ]
 </script>
 
diff --git a/frontend/src/pages/DocsPage.vue b/frontend/src/pages/DocsPage.vue
new file mode 100644
index 0000000..6d8c995
--- /dev/null
+++ b/frontend/src/pages/DocsPage.vue
@@ -0,0 +1,262 @@
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
+
+interface DocsData {
+  title: string
+  version: string
+  overview: string
+  webhook_request: any
+  webhook_response: any
+  scoring: any
+  failure_modes: Record<string, string>
+  challenge_types: { factual: any[]; creative: any[] }
+  testing: Record<string, any>
+  tips: string[]
+}
+
+const docs = ref<DocsData | null>(null)
+const error = ref('')
+const activeTab = ref<'webhook' | 'scoring' | 'challenges' | 'testing'>('webhook')
+
+onMounted(async () => {
+  try {
+    const res = await fetch('/api/docs/webhook')
+    if (!res.ok) throw new Error('Failed to load docs')
+    docs.value = await res.json()
+  } catch {
+    error.value = 'Could not load API docs.'
+  }
+})
+</script>
+
+<template>
+  <div class="min-h-[calc(100vh-4rem)] px-6 py-8 max-w-4xl mx-auto">
+    <div class="slide-up">
+
+      <div class="text-center mb-8">
+        <h2 class="font-display font-black text-3xl tracking-wider gradient-text mb-2">
+          API DOCS
+        </h2>
+        <p class="font-mono text-text-muted text-xs">
+          How to build a fighter. Webhook spec, scoring, and tips.
+        </p>
+      </div>
+
+      <div v-if="error" class="p-4 border-2 bg-ko/5 border-ko/30 text-ko font-mono text-xs">
+        {{ error }}
+      </div>
+
+      <div v-if="docs">
+        <!-- Tab nav -->
+        <div class="flex gap-1 mb-6 border-b border-border">
+          <button
+            v-for="tab in (['webhook', 'scoring', 'challenges', 'testing'] as const)"
+            :key="tab"
+            class="px-4 py-2 font-display font-bold text-[10px] uppercase tracking-[0.15em] transition-colors border-b-2 -mb-px"
+            :class="activeTab === tab
+              ? 'text-neon-cyan border-neon-cyan'
+              : 'text-text-muted border-transparent hover:text-text-secondary'"
+            @click="activeTab = tab"
+          >
+            {{ tab }}
+          </button>
+        </div>
+
+        <!-- WEBHOOK TAB -->
+        <div v-if="activeTab === 'webhook'" class="space-y-6">
+          <p class="font-mono text-text-secondary text-xs leading-relaxed">
+            {{ docs.overview }}
+          </p>
+
+          <!-- Request format -->
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-pink tracking-wider mb-3">
+              REQUEST (POST to your webhook)
+            </h3>
+            <div class="space-y-2">
+              <div
+                v-for="(field, key) in docs.webhook_request.fields"
+                :key="key"
+                class="flex gap-3 font-mono text-xs"
+              >
+                <span class="text-neon-cyan shrink-0 w-28">{{ key }}</span>
+                <span class="text-text-muted">{{ field.type }}</span>
+                <span class="text-text-secondary">{{ field.description }}</span>
+              </div>
+            </div>
+            <div class="mt-4">
+              <p class="text-[10px] font-display font-bold text-text-muted uppercase tracking-wider mb-2">Example</p>
+              <pre class="bg-bg p-3 text-[11px] font-mono text-neon-cyan/80 overflow-x-auto">{{ JSON.stringify(docs.webhook_request.example, null, 2) }}</pre>
+            </div>
+          </div>
+
+          <!-- Response format -->
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-pink tracking-wider mb-3">
+              RESPONSE (your bot returns)
+            </h3>
+            <div class="space-y-2">
+              <div
+                v-for="(field, key) in docs.webhook_response.fields"
+                :key="key"
+                class="flex gap-3 font-mono text-xs"
+              >
+                <span class="text-neon-cyan shrink-0 w-28">{{ key }}</span>
+                <span class="text-text-muted">{{ field.type }}</span>
+                <span class="text-text-secondary">{{ field.description }}</span>
+                <span v-if="field.required === false" class="text-text-muted italic">(optional)</span>
+              </div>
+            </div>
+            <div class="mt-4">
+              <p class="text-[10px] font-display font-bold text-text-muted uppercase tracking-wider mb-2">Example</p>
+              <pre class="bg-bg p-3 text-[11px] font-mono text-neon-cyan/80 overflow-x-auto">{{ JSON.stringify(docs.webhook_response.example, null, 2) }}</pre>
+            </div>
+          </div>
+
+          <!-- Failure modes -->
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-pink tracking-wider mb-3">
+              FAILURE MODES
+            </h3>
+            <div class="space-y-2">
+              <div
+                v-for="(desc, mode) in docs.failure_modes"
+                :key="mode"
+                class="flex gap-3 font-mono text-xs"
+              >
+                <span class="text-ko shrink-0 w-28">{{ mode }}</span>
+                <span class="text-text-secondary">{{ desc }}</span>
+              </div>
+            </div>
+          </div>
+        </div>
+
+        <!-- SCORING TAB -->
+        <div v-if="activeTab === 'scoring'" class="space-y-6">
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-cyan tracking-wider mb-3">
+              FACTUAL CHALLENGES
+            </h3>
+            <p class="font-mono text-text-secondary text-xs mb-3">
+              {{ docs.scoring.factual_challenges.description }}
+            </p>
+            <div class="space-y-3">
+              <div>
+                <p class="text-[10px] font-display font-bold text-text-muted uppercase tracking-wider mb-1">Answer Matching</p>
+                <ul class="space-y-1">
+                  <li
+                    v-for="rule in docs.scoring.factual_challenges.matching_rules"
+                    :key="rule"
+                    class="font-mono text-xs text-text-secondary pl-3 border-l-2 border-neon-cyan/20"
+                  >
+                    {{ rule }}
+                  </li>
+                </ul>
+              </div>
+              <div>
+                <p class="text-[10px] font-display font-bold text-text-muted uppercase tracking-wider mb-1">Scoring</p>
+                <ul class="space-y-1">
+                  <li
+                    v-for="rule in docs.scoring.factual_challenges.scoring_rules"
+                    :key="rule"
+                    class="font-mono text-xs text-text-secondary pl-3 border-l-2 border-neon-pink/20"
+                  >
+                    {{ rule }}
+                  </li>
+                </ul>
+              </div>
+            </div>
+          </div>
+
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-cyan tracking-wider mb-3">
+              CREATIVE CHALLENGES
+            </h3>
+            <p class="font-mono text-text-secondary text-xs mb-3">
+              {{ docs.scoring.creative_challenges.description }}
+            </p>
+            <ul class="space-y-1">
+              <li
+                v-for="rule in docs.scoring.creative_challenges.scoring_rules"
+                :key="rule"
+                class="font-mono text-xs text-text-secondary pl-3 border-l-2 border-neon-pink/20"
+              >
+                {{ rule }}
+              </li>
+            </ul>
+          </div>
+        </div>
+
+        <!-- CHALLENGES TAB -->
+        <div v-if="activeTab === 'challenges'" class="space-y-6">
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-cyan tracking-wider mb-3">
+              FACTUAL ({{ docs.challenge_types.factual.length }})
+            </h3>
+            <div class="space-y-2">
+              <div
+                v-for="ct in docs.challenge_types.factual"
+                :key="ct.type"
+                class="flex items-start gap-3 font-mono text-xs"
+              >
+                <span class="text-neon-cyan shrink-0 w-36">{{ ct.type }}</span>
+                <span class="text-text-muted shrink-0 w-16">{{ ct.timeout_ms }}ms</span>
+                <span class="text-text-secondary">{{ ct.description }}</span>
+              </div>
+            </div>
+          </div>
+
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-pink tracking-wider mb-3">
+              CREATIVE ({{ docs.challenge_types.creative.length }})
+            </h3>
+            <div class="space-y-2">
+              <div
+                v-for="ct in docs.challenge_types.creative"
+                :key="ct.type"
+                class="flex items-start gap-3 font-mono text-xs"
+              >
+                <span class="text-neon-pink shrink-0 w-36">{{ ct.type }}</span>
+                <span class="text-text-muted shrink-0 w-16">{{ ct.timeout_ms }}ms</span>
+                <span class="text-text-secondary">{{ ct.description }}</span>
+              </div>
+            </div>
+          </div>
+        </div>
+
+        <!-- TESTING TAB -->
+        <div v-if="activeTab === 'testing'" class="space-y-6">
+          <div
+            v-for="(test, key) in docs.testing"
+            :key="key"
+            class="border-2 border-border bg-surface p-4"
+          >
+            <h3 class="font-display font-bold text-sm text-neon-cyan tracking-wider mb-2">
+              {{ (test as any).method }} {{ (test as any).path }}
+            </h3>
+            <p class="font-mono text-text-secondary text-xs">
+              {{ (test as any).description }}
+            </p>
+          </div>
+
+          <!-- Tips -->
+          <div class="border-2 border-border bg-surface p-4">
+            <h3 class="font-display font-bold text-sm text-neon-pink tracking-wider mb-3">
+              TIPS
+            </h3>
+            <ul class="space-y-2">
+              <li
+                v-for="(tip, i) in docs.tips"
+                :key="i"
+                class="font-mono text-xs text-text-secondary pl-3 border-l-2 border-neon-cyan/20"
+              >
+                {{ tip }}
+              </li>
+            </ul>
+          </div>
+        </div>
+
+      </div>
+    </div>
+  </div>
+</template>
diff --git a/frontend/src/router.ts b/frontend/src/router.ts
index cf8c309..aa5fc31 100644
--- a/frontend/src/router.ts
+++ b/frontend/src/router.ts
@@ -51,6 +51,11 @@ const routes = [
     name: 'sprites',
     component: () => import('./pages/SpritePreviewPage.vue'),
   },
+  {
+    path: '/docs',
+    name: 'docs',
+    component: () => import('./pages/DocsPage.vue'),
+  },
 ]
 
 export const router = createRouter({