// GLOSSARY -- AGENTIC FINANCE
What are Agent Payment Rails?
Infrastructure and protocols enabling AI agents to send and receive payments — blockchain networks, stablecoins, payment protocols (x402, A2A), and settlement mechanisms for machine-to-machine transactions.
WHY IT MATTERS
Humans have credit cards and bank transfers. Agents need rails for programmatic access, instant settlement, low fees, and machine-readable interfaces.
Blockchain L2s with stablecoins lead: 24/7, programmable, global, seconds-fast. Traditional rails need human identity and take days.
The ecosystem is forming: x402 for HTTP-native, A2A for agent settlement, various wallet standards for plumbing.
HOW POLICYLAYER USES THIS
PolicyLayer sits on top of rails, adding policy enforcement regardless of chain or protocol.
FREQUENTLY ASKED QUESTIONS
Why blockchain over traditional rails?
Programmable interfaces, no human identity requirements, instant settlement, 24/7 availability, and global access. Traditional rails require KYC and settle in days.
Which chain is best?
Base (Coinbase L2) is becoming the default for x402 payments. Other L2s work — the key factors are low fees and fast confirmation.
Can agents use credit cards?
Not directly. Some services bridge this with virtual cards, but crypto rails are more natural for agent-to-agent payments.