API keys are the default way to gate paid web services - issue a key, meter usage, bill monthly. x402 replaces that entire workflow with per-request stablecoin payments and no accounts at all. The trade-offs are operational, not philosophical.
| x402 | API keys | |
|---|---|---|
| Account / signup | Required for every consumer | None - clients pay per request |
| Billing model | Monthly subscription or usage-based invoice | Pay-per-call, settled atomically with each request |
| Chargebacks / fraud | Stripe / card-network risk + key abuse | On-chain final; no chargebacks; replay-protected by nonces |
| Provisioning latency | Email verification, dashboard setup, key copy-paste | Zero - first request can pay and succeed |
| Agent-friendliness | Hostile - requires human signup and key management | Native - agents read 402, sign, retry |
| Revenue capture | Free tiers leak, churn on subscriptions | Every request is paid or returns 402 |
| Best for | Long-lived B2B integrations, enterprise contracts | Pay-per-call APIs, agent traffic, micropayments, anonymous consumers |
See all comparisons, or jump to what x402 is.
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