iuth

iuth is authentication and payment infrastructure for bot accounts on Solana, giving every call between a person and an automated program an identity, a permission scope and a settlement record. It serves product teams wiring AI agents into payments and on-chain actions. Once an agent holds a private key it can call without limit, users cannot cap a single transaction, and afterwards nobody can tell which step a person authorised and which a program executed.

An agent first registers a device fingerprint and its owning entity on-chain and receives a session key pair. The user issues an instruction as an unsigned intent stating the spending cap, callable contracts and validity period, and the agent submits the intent with its signature at execution, with out-of-scope requests falling back to manual confirmation. Payments use single-use virtual card numbers, each bound to one transaction limit and invalidated after settlement. Every call produces a verifiable credential recording time, amount and authoriser for merchants and users to reconcile.