THE COLD-START PROBLEM
Consumer crypto wallets were built around one assumption: a human approves every transaction with a click. An AI agent that needs to pay for compute, an API call, or a tool execution every few seconds breaks that model entirely. Either the human approves nothing in advance and the agent stalls, or the human signs a blank check and loses all control.
WHY CRYPTO AND NOT STRIPE
Card networks were designed for humans: chargebacks, KYC, merchant onboarding, minimum transaction sizes around a cent due to interchange fees. An agent paying $0.0004 to query a model or $0.02 to a remote tool can't use Visa rails — the fee swallows the payment. Stablecoin transfers on an L2 cost fractions of a cent and settle in seconds, with no merchant account required.
WHAT SCOPED DELEGATION ACTUALLY IS
Account abstraction (Ethereum's ERC-4337, finalized 2023) lets a wallet be a smart contract, not just a keypair. The owner can write rules: this delegate key can spend up to $50/day, only to addresses on this allowlist, only for the next 24 hours. The agent holds the delegate key; the master key stays with the human. Revocation is one on-chain transaction.
ON-CHAIN IDENTITY FOR NON-HUMANS
When an agent transacts, the counterparty wants to know what it is — a verified Anthropic agent, an unaffiliated bot, a known scammer's reused address. Standards like ERC-6551 (token-bound accounts) and DID frameworks attach reputation and provenance to the wallet itself, so an agent's history travels with it across services.
THE PRINCIPAL-AGENT PROBLEM, ON-CHAIN
Economists have studied delegated authority for a century: a steward acting on a principal's behalf will sometimes take actions the principal wouldn't approve. With humans, courts and contracts handle the abuse. With autonomous code spending money, the only enforcement is what the smart contract permits before the fact — there is no clawback, no court, no insurance.
THE KILLER-APP HISTORY
Every major computing wave found a payment-shaped killer app: PCs got spreadsheets, the web got e-commerce, smartphones got ride-sharing. Crypto has spent fifteen years searching for one beyond speculation. Agent-to-agent micropayments — machines hiring machines — is the first use case where the rails' specific properties (programmable, permissionless, sub-cent) match a workload no incumbent system can serve.