diff --git a/src/lib/bridge/handlers/fetch_steam_inventory.ts b/src/lib/bridge/handlers/fetch_steam_inventory.ts
new file mode 100644
index 00000000..f5356e22
--- /dev/null
+++ b/src/lib/bridge/handlers/fetch_steam_inventory.ts
@@ -0,0 +1,127 @@
+import {SimpleHandler} from './main';
+import {RequestType} from './types';
+import {getAccessToken} from '../../alarms/access_token';
+
+export interface FetchSteamPoweredInventoryRequest {
+    // steam_id needs to correspond to the logged in user
+    steam_id: string;
+    app_id: number;
+    context_id: number;
+    start_assetid?: string;
+    count?: number;
+    get_descriptions?: boolean;
+    for_trade_offer_verification?: boolean;
+    language?: string;
+    get_asset_properties?: boolean;
+}
+
+export interface InventoryAsset {
+    assetid: string;
+    classid: string;
+    instanceid: string;
+}
+
+export interface InventoryDescriptionItem {
+    value: string;
+    name: string;
+}
+
+export interface InventoryTag {
+    category: string;
+    internal_name: string;
+    localized_category_name: string;
+    localized_tag_name: string;
+}
+
+export interface AssetProperty {
+    propertyid: number;
+    int_value?: string;
+    float_value?: string;
+    string_value?: string;
+}
+
+export interface AssetPropertyWrapper {
+    appid: number;
+    asset_properties: AssetProperty[];
+    assetid: string;
+    contextid: string;
+}
+
+export interface InventoryDescription {
+    name: string;
+    market_hash_name: string;
+    icon_url: string;
+    icon_url_large: string;
+    tradable: boolean;
+    type: string;
+    name_color: string;
+    commodity: boolean;
+    inspect_link?: string;
+    classid: string;
+    instanceid: string;
+    marketable: boolean;
+    descriptions: InventoryDescriptionItem[];
+    tags: InventoryTag[];
+}
+
+export interface FetchSteamPoweredInventoryResponse {
+    assets: InventoryAsset[];
+    descriptions: InventoryDescription[];
+    asset_properties?: AssetPropertyWrapper[];
+    last_assetid?: string;
+    total_inventory_count: number;
+}
+
+export const FetchSteamPoweredInventory = new SimpleHandler<
+    FetchSteamPoweredInventoryRequest,
+    FetchSteamPoweredInventoryResponse
+>(RequestType.FETCH_STEAM_POWERED_INVENTORY, async (req) => {
+    const accessToken = await getAccessToken(req.steam_id);
+
+    const params = new URLSearchParams({
+        access_token: accessToken.token,
+        steamid: req.steam_id,
+        appid: req.app_id.toString(),
+        contextid: req.context_id.toString(),
+    });
+
+    if (req.start_assetid) {
+        params.set('start_assetid', req.start_assetid);
+    }
+
+    if (req.count) {
+        params.set('count', req.count.toString());
+    }
+
+    if (req.get_descriptions !== undefined) {
+        params.set('get_descriptions', req.get_descriptions.toString());
+    }
+
+    if (req.for_trade_offer_verification !== undefined) {
+        params.set('for_trade_offer_verification', req.for_trade_offer_verification.toString());
+    }
+
+    if (req.language) {
+        params.set('language', req.language);
+    }
+
+    if (req.get_asset_properties !== undefined) {
+        params.set('get_asset_properties', req.get_asset_properties.toString());
+    }
+
+    const resp = await fetch(
+        `https://api.steampowered.com/IEconService/GetInventoryItemsWithDescriptions/v1/?${params.toString()}`
+    );
+
+    if (!resp.ok) {
+        throw new Error(`Invalid response code: ${resp.status}`);
+    }
+
+    const data = await resp.json();
+
+    if (!data.response) {
+        throw new Error('Invalid response from Steam API');
+    }
+
+    return data.response as FetchSteamPoweredInventoryResponse;
+});
diff --git a/src/lib/bridge/handlers/handlers.ts b/src/lib/bridge/handlers/handlers.ts
index ac1b2f00..cd6181bd 100644
--- a/src/lib/bridge/handlers/handlers.ts
+++ b/src/lib/bridge/handlers/handlers.ts
@@ -36,6 +36,7 @@ import {FetchSlimTrades} from './fetch_slim_trades';
 import {NotaryProve} from './notary_prove';
 import {FetchNotaryMeta} from './fetch_notary_meta';
 import {FetchNotaryToken} from './fetch_notary_token';
+import {FetchSteamPoweredInventory} from './fetch_steam_inventory';
 
 export const HANDLERS_MAP: {[key in RequestType]: RequestHandler<any, any>} = {
     [RequestType.EXECUTE_SCRIPT_ON_PAGE]: ExecuteScriptOnPage,
@@ -74,4 +75,5 @@ export const HANDLERS_MAP: {[key in RequestType]: RequestHandler<any, any>} = {
     [RequestType.NOTARY_PROVE]: NotaryProve,
     [RequestType.FETCH_NOTARY_META]: FetchNotaryMeta,
     [RequestType.FETCH_NOTARY_TOKEN]: FetchNotaryToken,
+    [RequestType.FETCH_STEAM_POWERED_INVENTORY]: FetchSteamPoweredInventory,
 };
diff --git a/src/lib/bridge/handlers/types.ts b/src/lib/bridge/handlers/types.ts
index 033fc919..70d0a2d5 100644
--- a/src/lib/bridge/handlers/types.ts
+++ b/src/lib/bridge/handlers/types.ts
@@ -35,4 +35,5 @@ export enum RequestType {
     NOTARY_PROVE = 33,
     FETCH_NOTARY_META = 34,
     FETCH_NOTARY_TOKEN = 35,
+    FETCH_STEAM_POWERED_INVENTORY = 36,
 }
diff --git a/src/lib/notary/types.ts b/src/lib/notary/types.ts
index cb6cd782..40c85ea8 100644
--- a/src/lib/notary/types.ts
+++ b/src/lib/notary/types.ts
@@ -3,6 +3,7 @@ export enum ProofType {
     TRADE_OFFER = 'trade_offer',
     TRADE_HISTORY = 'trade_history',
     TRADE_STATUS = 'trade_status',
+    INVENTORY = 'inventory',
 }
 
 interface ProveRequestPayloads {
@@ -38,6 +39,18 @@ interface ProveRequestPayloads {
         get_descriptions?: boolean;
         language?: string;
     };
+    // IEconService/GetInventoryItemsWithDescriptions/v1/
+    [ProofType.INVENTORY]: {
+        steamid: string;
+        appid: number;
+        contextid: number;
+        get_descriptions?: boolean;
+        for_trade_offer_verification?: boolean;
+        language?: string;
+        start_assetid?: string;
+        count?: number;
+        get_asset_properties?: boolean;
+    };
 }
 
 export type NotaryProveRequest = {
diff --git a/src/lib/notary/utils.ts b/src/lib/notary/utils.ts
index 4c0aa09d..2c29314b 100644
--- a/src/lib/notary/utils.ts
+++ b/src/lib/notary/utils.ts
@@ -6,6 +6,7 @@ const PROOF_BASE_URLS: Record<ProofType, string> = {
     [ProofType.TRADE_OFFER]: 'https://api.steampowered.com/IEconService/GetTradeOffer/v1/',
     [ProofType.TRADE_HISTORY]: 'https://api.steampowered.com/IEconService/GetTradeHistory/v1/',
     [ProofType.TRADE_STATUS]: 'https://api.steampowered.com/IEconService/GetTradeStatus/v1/',
+    [ProofType.INVENTORY]: 'https://api.steampowered.com/IEconService/GetInventoryItemsWithDescriptions/v1/',
 };
 
 function buildQueryString(params: Record<string, any>): string {