Infrastructure · Consent · Authorization
Agent Payment Consent Verification: Frameworks and Security
As AI agents execute financial transactions on behalf of users, the ability to cryptographically verify that a user actually consented to a transaction becomes critical infrastructure. This article explores consent verification mechanisms that preserve user agency while enabling agent autonomy.
Overview
Traditional online transactions follow a simple model: a user clicks "confirm" and the transaction executes. But agents operate differently:
The core challenge: How do you prove a user consented to a transaction that may execute in a completely different security context, days later, without human interaction?
Different use cases require different consent models. AffixIO supports multiple consent verification patterns:
User explicitly approves each transaction as it occurs. Most secure but least agent-autonomy. User's device signs consent for specific transaction with all details included.
User delegates consent authority to an agent within defined parameters. Requires cryptographic proof of delegation. User grants agent payment authority with constraints on transaction amounts, merchants, and validity periods.
Agent executes transactions below certain thresholds; user approval required above them. Balances autonomy with oversight:
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