Muse's invite program (launched September 16, 2026) is simple on the surface: redeem someone's code, and that person gets 1 billion tokens. In practice, two rules quietly waste a lot of people's one shot — and a small market of code pools, fill-up services, and dead-code lists has grown around them. Here's the whole thing, minus the folklore.

The mechanics

Every Muse account has an invite code.

When a new user redeems your code, you receive 1B tokens.

A code caps out at 30 fills — after that it's full and redeems fail.

There is no API or checker to test a code in advance. The only verdict is the redemption result inside the app.

Rule 1: the 48-hour window

You can redeem a code only within 48 hours of registering . After that, the account is permanently ineligible. This is why every "looking for a Muse invite code" post is urgent, and why codes offered to week-old accounts are useless.

Rule 2: once per account, ever

Each account can redeem exactly one code in its lifetime.…