diff --git a/src/http/responses/collections.ts b/src/http/responses/collections.ts
index 49297e2..83423d7 100644
--- a/src/http/responses/collections.ts
+++ b/src/http/responses/collections.ts
@@ -1,6 +1,6 @@
-import type { IconifyInfo } from '@iconify/types';
 import type { FastifyReply, FastifyRequest } from 'fastify';
 import { getPrefixes, iconSets } from '../../data/icon-sets';
+import type { APIv2CollectionsResponse } from '../../types/server/v2';
 import { checkJSONPQuery, sendJSONResponse } from '../helpers/json';
 import { filterPrefixesByPrefix } from '../helpers/prefixes';
 
@@ -18,7 +18,7 @@ export function generateCollectionsListResponse(query: FastifyRequest['query'],
 
 	// Filter prefixes
 	const prefixes = filterPrefixesByPrefix(getPrefixes('info'), q, false);
-	const response = Object.create(null) as Record<string, IconifyInfo>;
+	const response = Object.create(null) as APIv2CollectionsResponse;
 
 	for (let i = 0; i < prefixes.length; i++) {
 		const prefix = prefixes[i];
diff --git a/src/http/responses/modified.ts b/src/http/responses/modified.ts
index d03a721..2c27ab1 100644
--- a/src/http/responses/modified.ts
+++ b/src/http/responses/modified.ts
@@ -1,6 +1,6 @@
 import type { FastifyReply, FastifyRequest } from 'fastify';
 import { getPrefixes, iconSets } from '../../data/icon-sets';
-import type { LastModifiedAPIResponse } from '../../types/server/modified';
+import type { APIv3LastModifiedResponse } from '../../types/server/modified';
 import { checkJSONPQuery, sendJSONResponse } from '../helpers/json';
 import { filterPrefixesByPrefix } from '../helpers/prefixes';
 
@@ -21,7 +21,7 @@ export function generateLastModifiedResponse(query: FastifyRequest['query'], res
 
 	// Generate result
 	const lastModified = Object.create(null) as Record<string, number>;
-	const response: LastModifiedAPIResponse = {
+	const response: APIv3LastModifiedResponse = {
 		lastModified,
 	};
 	let found = false;
diff --git a/src/types/server/modified.ts b/src/types/server/modified.ts
index 1a7333e..6a0a8f9 100644
--- a/src/types/server/modified.ts
+++ b/src/types/server/modified.ts
@@ -3,6 +3,6 @@
  *
  * Key is prefix, value is last modification time number
  */
-export interface LastModifiedAPIResponse {
+export interface APIv3LastModifiedResponse {
 	lastModified: Record<string, number>;
 }
diff --git a/src/types/server/v2.ts b/src/types/server/v2.ts
new file mode 100644
index 0000000..af9850e
--- /dev/null
+++ b/src/types/server/v2.ts
@@ -0,0 +1,141 @@
+import type { IconifyInfo, IconifyJSON } from '@iconify/types';
+
+/**
+ * Common stuff
+ */
+interface APIv2CommonParams {
+	// Pretty output, default = false
+	pretty?: boolean;
+}
+
+/**
+ * Prefixes list
+ *
+ * Separated by ','
+ * Ends with '-' = partial prefix: 'fa-'
+ * Does not end with '-' = full prefix: 'mdi'
+ */
+type PrefixesMatches = string;
+
+/**
+ * Search query string
+ *
+ * List of queries, split by whitespace. Must match all queries
+ * Entry starts with '-': exclude it
+ */
+type SearchQuery = string;
+
+/**
+ * /collections
+ */
+export interface APIv2CollectionsParams extends APIv2CommonParams {
+	// Useless
+	version?: 1;
+
+	// Include hidden icon sets
+	hidden?: boolean;
+
+	// Filter icon sets by prefixes
+	prefixes?: PrefixesMatches;
+}
+
+export type APIv2CollectionsResponse = Record<string, IconifyInfo>;
+
+/**
+ * /collection
+ */
+export interface APIv2CollectionParams extends APIv2CommonParams {
+	// Icon set prefix
+	prefix: string;
+
+	// Include icon set info in response
+	info?: boolean;
+
+	// Include aliases in response
+	aliases?: boolean;
+
+	// Include characters in response
+	chars?: boolean;
+
+	// Include hidden icons
+	hidden?: boolean;
+}
+
+export interface APIv2CollectionResponse {
+	// Icon set prefix
+	prefix: string;
+
+	// Number of icons (duplicate of info?.total)
+	total: number;
+
+	// Icon set title, if available (duplicate of info?.name)
+	title?: string;
+
+	// Icon set info
+	info?: IconifyInfo;
+
+	// List of icons without categories
+	uncategorized?: string[];
+
+	// List of icons, sorted by category
+	categories?: Record<string, string[]>;
+
+	// List of hidden icons
+	hidden?: string[];
+
+	// List of aliases, key = alias, value = parent icon
+	aliases?: Record<string, string>;
+
+	// Characters, key = character, value = icon name
+	chars?: Record<string, string>;
+
+	// Themes
+	themes?: IconifyJSON['themes'];
+	prefixes?: IconifyJSON['prefixes'];
+	suffixes?: IconifyJSON['suffixes'];
+}
+
+/**
+ * /search
+ */
+export interface APIv2SearchParams extends APIv2CommonParams {
+	// Search string
+	query: SearchQuery;
+
+	// Maximum number of items in response
+	limit?: number;
+
+	// Start index for results
+	start?: number;
+
+	// Filter icon sets by prefixes
+	prefix?: string; // One prefix
+	collection?: string; // One prefix
+	prefixes?: PrefixesMatches; // Multiple prefixes or partial
+
+	// Filter icon sets by category
+	category?: string;
+
+	// Include similar keywords (partial matches for words), default = true
+	similar?: boolean;
+}
+
+export interface APIv2SearchResponse {
+	// List of icons, including prefixes
+	icons: string[];
+
+	// Number of results. If same as `limit`, more results are available
+	total: number;
+
+	// Number of results shown
+	limit: number;
+
+	// Index of first result
+	start: number;
+
+	// Info about icon sets
+	collections: Record<string, IconifyInfo>;
+
+	// Copy of request
+	request: APIv2SearchParams;
+}