x402 Preflight · docs · x402 vs Stripe

x402 vs Stripe: per-call billing for APIs

They solve different problems. x402 is an open, HTTP-native rail for machine-to-machine, per-call payments settled in stablecoin; Stripe is a card and subscription stack for human checkout. For sub-cent API calls, card rails carry fixed fees that make the economics hard; x402 moves the payment into the request itself.

Quick comparison

• Payer: x402 → an agent/software with a wallet; Stripe → a person with a card.
• Unit: x402 → per call, often fractions of a cent; Stripe → per charge/subscription.
• Settlement: x402 → on-chain stablecoin (commonly USDC on Base); Stripe → fiat to your bank.
• Onboarding: x402 → no account or key needed for the paying call; Stripe → merchant account and KYC.
• Fee shape: x402 → network/facilitator costs; Stripe → percentage + fixed per charge.

When x402 is the wrong tool

Human checkout, refunds, chargebacks and subscriptions are Stripe's ground. x402 does not provide those flows, and it is not a consumer checkout product.

When Stripe is the wrong tool

An autonomous agent making thousands of tiny calls per day: a fixed per-charge fee dwarfs the amount, and no human is present to complete checkout.

What this does NOT prove

Choosing a rail does not itself prove your endpoint charges correctly or that any catalogue indexes it. Verify the live challenge — that is a separate check.

Check your own endpoint (free, read-only)

curl -s -X POST https://x402.chikocorp.com/api/preflight/inspect \
  -H 'content-type: application/json' \
  -d '{"resource_url":"https://your-api.example.com/resource","method":"GET"}'

Deeper read: the technical audit is 0.05 USDC and the full diagnostic report 5 USDC, paid in USDC on Base and delivered by API. Monthly monitoring is 29 USDC/month.

Frequently asked questions

Is x402 a Stripe replacement?

Not for human checkout. x402 targets machine-to-machine, per-call payments; Stripe targets cards, subscriptions and hosted checkout for people.

Can I use both x402 and Stripe?

Yes. Many APIs keep Stripe for human billing and add x402 for agent/API per-call access.

More answers for x402 API developers — back to x402 Preflight.