diff --git a/apps/web/src/components/Ecosystem/Card.tsx b/apps/web/src/components/Ecosystem/Card.tsx
index 6309ced00b3..2fbf3cf3be2 100644
--- a/apps/web/src/components/Ecosystem/Card.tsx
+++ b/apps/web/src/components/Ecosystem/Card.tsx
@@ -1,26 +1,48 @@
 'use client';
+
+/**
+ * Ecosystem Card Component
+ *
+ * Displays an individual ecosystem project/app in a card format.
+ * Includes project logo, name, description, and category tags.
+ */
+
 import ImageWithLoading from 'apps/web/src/components/ImageWithLoading';
 import Card from 'apps/web/src/components/base-org/Card';
 import Text from 'apps/web/src/components/base-org/typography/TextRedesign';
 import { TextVariant } from 'apps/web/src/components/base-org/typography/TextRedesign/types';
 import Title from 'apps/web/src/components/base-org/typography/TitleRedesign';
 import { TitleLevel } from 'apps/web/src/components/base-org/typography/TitleRedesign/types';
+import type { EcosystemApp } from 'apps/web/src/types/ecosystem';
 
-type Props = {
-  name: string;
-  url: string;
-  description: string;
-  imageUrl: string;
-  category: string;
-  subcategory: string;
-};
+type Props = EcosystemApp;
 
 const MAX_DESCRIPTION_LENGTH = 200;
 
-function getNiceDomainDisplayFromUrl(url: string) {
+/**
+ * Extracts a clean domain name from a URL for display purposes.
+ * Removes protocol and www prefix, and strips path segments.
+ *
+ * @param url - The full URL to extract the domain from
+ * @returns The cleaned domain name (e.g., "example.com")
+ *
+ * @example
+ * getNiceDomainDisplayFromUrl("https://www.example.com/path") // returns "example.com"
+ */
+function getNiceDomainDisplayFromUrl(url: string): string {
   return url.replace('https://', '').replace('http://', '').replace('www.', '').split('/')[0];
 }
 
+/**
+ * EcosystemCard displays a single ecosystem project in a clickable card format.
+ *
+ * Features:
+ * - Project logo with loading state
+ * - Project name and domain
+ * - Truncated description (max 200 characters)
+ * - Category and subcategory tags
+ * - Opens project URL in a new tab
+ */
 export default function EcosystemCard({
   name,
   url,
@@ -39,7 +61,8 @@ export default function EcosystemCard({
       href={url}
       rel="noreferrer noopener"
       target="_blank"
-      className="flex flex-col items-stretch w-full h-full justify-stretch"
+      aria-label={`Visit ${name} - ${category} project. ${truncatedDescription}`}
+      className="flex flex-col items-stretch w-full h-full justify-stretch focus:outline-none focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:ring-offset-2 rounded-lg"
     >
       <Card
         wrapperClassName="w-full h-full"
diff --git a/apps/web/src/components/Ecosystem/Content.tsx b/apps/web/src/components/Ecosystem/Content.tsx
index 619fa708a9c..7df3c1b374b 100644
--- a/apps/web/src/components/Ecosystem/Content.tsx
+++ b/apps/web/src/components/Ecosystem/Content.tsx
@@ -1,5 +1,12 @@
 'use client';
 
+/**
+ * Ecosystem Content Component
+ *
+ * Main content component for the Base Ecosystem page.
+ * Handles filtering, searching, and displaying ecosystem apps.
+ */
+
 import ecosystemApps from 'apps/web/src/data/ecosystem.json';
 import { SearchBar } from 'apps/web/src/components/Ecosystem/SearchBar';
 import { useMemo, useState, useEffect, useCallback } from 'react';
@@ -7,17 +14,15 @@ import { List } from 'apps/web/src/components/Ecosystem/List';
 import { useSearchParams } from 'next/navigation';
 import { EcosystemFilters } from 'apps/web/src/components/Ecosystem/EcosystemFilters';
 import EcosystemFiltersMobile from 'apps/web/src/components/Ecosystem/EcosystemFiltersMobile';
+import type { DecoratedEcosystemApp, EcosystemCategoryConfig } from 'apps/web/src/types/ecosystem';
 
-export type EcosystemApp = {
-  searchName: string;
-  name: string;
-  category: string;
-  subcategory: string;
-  url: string;
-  description: string;
-  imageUrl: string;
-};
+// Re-export for backward compatibility with existing imports
+export type EcosystemApp = DecoratedEcosystemApp;
 
+/**
+ * Category configuration mapping each category to its valid subcategories.
+ * Used for filtering ecosystem apps by category and subcategory.
+ */
 const config: Record<string, string[]> = {
   ai: ['ai'],
   wallet: ['account abstraction', 'multisig', 'self-custody'],
diff --git a/apps/web/src/components/Ecosystem/List.tsx b/apps/web/src/components/Ecosystem/List.tsx
index 824f369d2bb..1cb55e293b0 100644
--- a/apps/web/src/components/Ecosystem/List.tsx
+++ b/apps/web/src/components/Ecosystem/List.tsx
@@ -1,8 +1,16 @@
 'use client';
+
+/**
+ * Ecosystem List Component
+ *
+ * Renders a grid of ecosystem app cards with animation support.
+ * Handles empty states and "load more" pagination.
+ */
+
 import classNames from 'classnames';
 import { AnimatePresence, motion, cubicBezier } from 'motion/react';
 import EcosystemCard from './Card';
-import { EcosystemApp } from 'apps/web/src/components/Ecosystem/Content';
+import type { DecoratedEcosystemApp } from 'apps/web/src/types/ecosystem';
 import { Dispatch, SetStateAction, useCallback } from 'react';
 import {
   Button,
@@ -23,7 +31,10 @@ const cardAnimations = {
   exit: { opacity: 0 },
 };
 
-function AnimatedEcosystemCard({ app }: { app: EcosystemApp }) {
+/**
+ * Animated wrapper for ecosystem cards with enter/exit transitions.
+ */
+function AnimatedEcosystemCard({ app }: { app: DecoratedEcosystemApp }) {
   return (
     <motion.div
       layout
@@ -38,6 +49,33 @@ function AnimatedEcosystemCard({ app }: { app: EcosystemApp }) {
   );
 }
 
+/**
+ * Props for the List component
+ */
+interface ListProps {
+  /** Currently selected category filters */
+  selectedCategories: string[];
+  /** Current search query text */
+  searchText: string;
+  /** Filtered array of ecosystem apps to display */
+  apps: DecoratedEcosystemApp[];
+  /** Number of apps currently shown (for pagination) */
+  showCount: number;
+  /** Callback to update the show count */
+  setShowCount: Dispatch<SetStateAction<number>>;
+  /** Callback to clear the search query */
+  onClearSearch: () => void;
+}
+
+/**
+ * List component displays a paginated grid of ecosystem app cards.
+ *
+ * Features:
+ * - Animated card grid with staggered transitions
+ * - Empty state with helpful messaging
+ * - "View more" pagination button
+ * - Responsive grid layout (1-3 columns)
+ */
 export function List({
   selectedCategories,
   searchText,
@@ -45,14 +83,7 @@ export function List({
   showCount,
   setShowCount,
   onClearSearch,
-}: {
-  selectedCategories: string[];
-  searchText: string;
-  apps: EcosystemApp[];
-  showCount: number;
-  setShowCount: Dispatch<SetStateAction<number>>;
-  onClearSearch: () => void;
-}) {
+}: ListProps) {
   const canShowMore = showCount < apps.length;
   const showEmptyState = apps.length === 0;
   const truncatedApps = apps.slice(0, showCount);
diff --git a/apps/web/src/components/Ecosystem/SearchBar.tsx b/apps/web/src/components/Ecosystem/SearchBar.tsx
index 917dfa95077..18f3de4ed76 100644
--- a/apps/web/src/components/Ecosystem/SearchBar.tsx
+++ b/apps/web/src/components/Ecosystem/SearchBar.tsx
@@ -1,4 +1,12 @@
 'use client';
+
+/**
+ * Ecosystem SearchBar Component
+ *
+ * An animated, accessible search input for filtering ecosystem apps.
+ * Features expandable mobile design and keyboard accessibility.
+ */
+
 import { Dispatch, SetStateAction, useCallback, useRef, useState, useEffect } from 'react';
 import { motion, AnimatePresence, cubicBezier, Variants } from 'motion/react';
 
@@ -22,6 +30,9 @@ const buttonVariants: Variants = {
   exit: { opacity: 0 },
 };
 
+/**
+ * Search icon SVG component
+ */
 function SearchIcon() {
   return (
     <svg xmlns="http://www.w3.org/2000/svg" width="15" height="14" viewBox="0 0 15 14" fill="none">
@@ -33,6 +44,9 @@ function SearchIcon() {
   );
 }
 
+/**
+ * Close/clear icon SVG component
+ */
 function XIcon() {
   return (
     <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16" fill="none">
@@ -44,13 +58,33 @@ function XIcon() {
   );
 }
 
-export function SearchBar({
-  search,
-  setSearch,
-}: {
+/**
+ * Props for the SearchBar component
+ */
+interface SearchBarProps {
+  /** Current search query value */
   search: string;
+  /** Callback to update the search query */
   setSearch: Dispatch<SetStateAction<string>>;
-}) {
+}
+
+/**
+ * SearchBar provides an animated, accessible search input for the ecosystem page.
+ *
+ * Features:
+ * - Expandable design on mobile devices
+ * - Animated transitions for expand/collapse
+ * - Clear button when search has content
+ * - Keyboard accessible with proper focus management
+ * - ARIA labels for screen reader support
+ *
+ * @example
+ * ```tsx
+ * const [search, setSearch] = useState('');
+ * <SearchBar search={search} setSearch={setSearch} />
+ * ```
+ */
+export function SearchBar({ search, setSearch }: SearchBarProps) {
   const [isExpanded, setIsExpanded] = useState(false);
   const debounced = useRef<number>();
   const inputRef = useRef<HTMLInputElement>(null);
@@ -138,8 +172,8 @@ export function SearchBar({
           <motion.button
             type="button"
             onClick={clearInput}
-            aria-label="clear input"
-            className="absolute right-2 flex-shrink-0"
+            aria-label="Clear search input"
+            className="absolute right-2 flex-shrink-0 rounded focus:outline-none focus-visible:ring-2 focus-visible:ring-blue-500"
             variants={buttonVariants}
             initial="initial"
             animate="animate"
diff --git a/apps/web/src/types/ecosystem.ts b/apps/web/src/types/ecosystem.ts
new file mode 100644
index 00000000000..c693449e7fb
--- /dev/null
+++ b/apps/web/src/types/ecosystem.ts
@@ -0,0 +1,125 @@
+/**
+ * Ecosystem Types
+ *
+ * Type definitions for the Base Ecosystem page components and data structures.
+ * These types ensure type safety across ecosystem-related components.
+ */
+
+/**
+ * Valid ecosystem categories
+ * Each category groups related projects in the Base ecosystem
+ */
+export type EcosystemCategory = 'ai' | 'consumer' | 'defi' | 'infra' | 'onramp' | 'wallet';
+
+/**
+ * Subcategories for AI projects
+ */
+export type AISubcategory = 'ai';
+
+/**
+ * Subcategories for Consumer projects
+ */
+export type ConsumerSubcategory =
+  | 'creator'
+  | 'crypto taxes'
+  | 'dao'
+  | 'gaming'
+  | 'messaging'
+  | 'music'
+  | 'nft'
+  | 'payments'
+  | 'real world'
+  | 'social';
+
+/**
+ * Subcategories for DeFi projects
+ */
+export type DeFiSubcategory =
+  | 'dex'
+  | 'dex aggregator'
+  | 'insurance'
+  | 'lending/borrowing'
+  | 'liquidity management'
+  | 'portfolio'
+  | 'stablecoin'
+  | 'yield vault';
+
+/**
+ * Subcategories for Infrastructure projects
+ */
+export type InfraSubcategory =
+  | 'bridge'
+  | 'data'
+  | 'depin'
+  | 'developer tool'
+  | 'identity'
+  | 'node provider'
+  | 'raas'
+  | 'security';
+
+/**
+ * Subcategories for Onramp projects
+ */
+export type OnrampSubcategory = 'centralized exchange' | 'fiat on-ramp';
+
+/**
+ * Subcategories for Wallet projects
+ */
+export type WalletSubcategory = 'account abstraction' | 'multisig' | 'self-custody';
+
+/**
+ * Union type of all valid subcategories
+ */
+export type EcosystemSubcategory =
+  | AISubcategory
+  | ConsumerSubcategory
+  | DeFiSubcategory
+  | InfraSubcategory
+  | OnrampSubcategory
+  | WalletSubcategory;
+
+/**
+ * Represents a project/app in the Base ecosystem
+ */
+export interface EcosystemApp {
+  /** Display name of the project */
+  name: string;
+  /** Brief description of the project (max 200 characters) */
+  description: string;
+  /** Project website URL */
+  url: string;
+  /** Path to the project's logo image (e.g., '/images/partners/logo.png') */
+  imageUrl: string;
+  /** Primary category of the project */
+  category: EcosystemCategory;
+  /** Subcategory within the primary category */
+  subcategory: EcosystemSubcategory;
+}
+
+/**
+ * Extended ecosystem app with search-optimized fields
+ * Used internally for filtering and searching
+ */
+export interface DecoratedEcosystemApp extends EcosystemApp {
+  /** Lowercase version of name for case-insensitive search */
+  searchName: string;
+}
+
+/**
+ * Configuration mapping categories to their subcategories
+ */
+export type EcosystemCategoryConfig = Record<EcosystemCategory, EcosystemSubcategory[]>;
+
+/**
+ * Props for ecosystem filter components
+ */
+export interface EcosystemFilterProps {
+  /** Currently selected categories */
+  selectedCategories: string[];
+  /** Currently selected subcategories */
+  selectedSubcategories: string[];
+  /** Callback to update selected subcategories */
+  setSelectedSubcategories: (subcategories: string[]) => void;
+  /** Category to subcategory configuration */
+  config: Record<string, string[]>;
+}
diff --git a/apps/web/src/types/index.ts b/apps/web/src/types/index.ts
new file mode 100644
index 00000000000..41f3cee38fc
--- /dev/null
+++ b/apps/web/src/types/index.ts
@@ -0,0 +1,23 @@
+/**
+ * Type exports for the Base web application
+ *
+ * This barrel file re-exports all types from the types directory
+ * for convenient importing throughout the application.
+ */
+
+export type {
+  EcosystemApp,
+  EcosystemCategory,
+  EcosystemSubcategory,
+  DecoratedEcosystemApp,
+  EcosystemCategoryConfig,
+  EcosystemFilterProps,
+  AISubcategory,
+  ConsumerSubcategory,
+  DeFiSubcategory,
+  InfraSubcategory,
+  OnrampSubcategory,
+  WalletSubcategory,
+} from './ecosystem';
+
+export type { ManagedAddressesData, ManagedAddressesResponse } from './ManagedAddresses';