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LETHE has two related but distinct systems: account sign-in (for history sync) and wallet linking (for quota/API access). You can use either independently.

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Account sign-in

Sign in to sync chat and Studio history across devices. Backed by Supabase auth, with these methods:
  • Email magic link: no password, click a link sent to your inbox.
  • Google OAuth
  • Discord OAuth
  • Ethereum wallet (SIWE): sign a message with your wallet instead of a password; this authenticates you but is not the same as wallet-linking for API quota below.
Signed-in data is stored per-account with row-level security in Supabase Postgres.

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Wallet linking (quota + API key)

At /cli, connecting a wallet links your current network for 24 hours and:
  • Raises your daily message limit from 3/network (guest) to 50/day (UTC)
  • Issues a portable API key (ltk_…) for use in any HTTP client, SDK, or CLI tool. See Authentication & API Keys
This does not require the account sign-in above, and does not by itself sync chat history. It’s purely a quota/API access mechanism today.
Wallet linking today does not involve any on-chain payment. It’s a verification step to raise your rate limit. See x402 Micropayments for the planned pay-per-call model.