{"id":15237,"date":"2026-10-01T03:39:22","date_gmt":"2026-10-01T03:39:22","guid":{"rendered":"https:\/\/playgama.com\/blog\/?p=15237"},"modified":"2026-10-01T03:39:22","modified_gmt":"2026-10-01T03:39:22","slug":"how-do-ephemeral-client-tokens-protect-api-keys-in-browser-g","status":"publish","type":"post","link":"https:\/\/playgama.com\/blog\/business-faqs\/how-do-ephemeral-client-tokens-protect-api-keys-in-browser-g\/","title":{"rendered":"How do ephemeral client tokens protect API keys in browser games?"},"content":{"rendered":"

Never send your real API key to the browser. Your server holds the key and mints a short-lived ephemeral token per session; the game’s client-side JavaScript uses only that token, which expires quickly and limits damage if it leaks.<\/strong><\/p>\n

At a glance<\/h2>\n\n\n\n\n\n\n\n
Fact<\/th>\nValue<\/th>\nSource<\/th>\n<\/tr>\n<\/thead>\n
OpenAI Realtime uses ephemeral client secrets<\/td>\nminted server-side<\/td>\ndevelopers.openai.com<\/a><\/td>\n<\/tr>\n
Browser gets SDP offer exchanged via server<\/td>\nserver holds project key<\/td>\nplatform.openai.com<\/a><\/td>\n<\/tr>\n
GitHub scans repos for committed secrets<\/td>\nfull git history, all branches<\/td>\ndocs.github.com<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ephemeral tokens work by never letting the browser see your real API key. Your own server (or a serverless function) holds the long-lived key and calls the AI provider’s API to mint a short-lived credential scoped to one session. Your game’s JavaScript receives only that credential and uses it to talk to the AI service directly – for OpenAI’s Realtime API, the application server creates an ephemeral client secret for the Realtime session<\/a>, and the browser connects over WebRTC using that secret, never the underlying project key. Because the token expires quickly, a player who inspects network traffic or browser memory only ever finds a credential with a short life, not one that keeps working indefinitely.<\/p>\n

If you are developing your browser game with an AI coding agent like Claude Code or Cursor, the Playgama MCP server connects your agent directly to the developer cabinet to upload builds and publish a test sandbox.<\/p>\n

This matters for browser games specifically because your entire client is downloadable source: anyone can open devtools, view the page source, or unzip an itch.io\/CrazyGames\/playgama.com<\/a> build and read every string in it. API credentials in client-side code are vulnerable to extraction attacks<\/a>, and obfuscation does not fix this – the fix is architectural: the real key never ships to the client at all.<\/p>\n

How do you implement ephemeral client tokens?<\/h2>\n