STRK20 anonymizer contracts (privacy_invoke)

Anonymizer contracts, also called helper contracts, are how private funds interact with the outside world (DEXs, lending vaults, escrows) without revealing who is behind the interaction. Full doc pages with complete Cairo sources sit in references/.

Route before writing Cairo. Use a helper when one shared caller should perform an atomic operation and return its output immediately to private notes. Use the canonical ShadowAccountAnonymizer through strk20-wallet-api when each user needs a stable pseudonymous address that holds shares, debt, NFTs, rewards, or other state across transactions. A target protocol with ordinary callable entrypoints does not need a protocol-specific helper merely because the dapp uses shadow accounts.

The pattern: an atomic sandwich