That's why AI agents can't use your credit card. Autonomous agents need to buy GPU cycles, datasets, and API verifications for fractions of a cent — in milliseconds.
Legacy rails structurally fail here.
The revival of HTTP 402:
Reserved since the 1990s, HTTP 402 (Payment Required) is now the standard for pay-per-request APIs. The server returns an invoice and macaroon; the agent settles via Lightning or L2, then retries with a cryptographic proof. Median M2M fee: $0.00008. Settlement finality: under 350ms.
Why cards and ACH can't compete:
Minimum economical transaction: $1.00 vs. $0.00001
Settlement: 48–72 hours with chargebacks vs. sub-second irreversible
Agent autonomy: manual card entry vs. native self-custody
Securing machine treasuries:
ERC-4337 account abstraction with session keys and daily spend limits
Programmatic escrow released on automated test verification
Multi-sig recovery managed by human controllers
Cryptographic receipts piped into ERP for real-time reconciliation
The B2B SaaS shift: rigid monthly seats get replaced by pay-per-compute micro-transactions. Vendors monetize actual API executions, not idle licenses.
Projected M2M liquidity: $48.2B annually by 2027.
Full read: https://www.nizover.com/en/blog/business-autonomous-agent-economy-m2m-micropayments
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