Cartridge

Cartridge provides accounts and payments for games on Starknet, built around Controller: a player signs in with a social account or wallet and receives a smart account whose session keys pre-authorise contracts and methods, with a Paymaster covering gas so in-game actions stop prompting per transaction. Policies are expressed as SessionPolicies limiting callable contracts, methods, token allowances and signed message types, verified onchain by Merkle proof, so calls outside the policy fail outright.

In the Starknet gaming stack it works alongside the Dojo engine and local Katana chains, covering sign-in, signing and settlement so studios integrate an SDK instead of building key management and top-ups. Controller also serves as the player-facing wallet, with achievements and inventories reusable across titles, which builds account-side stickiness. Policies can be submitted to a presets repository for a verified badge, and the approval screen shows a plain-language description of each callable method.