BLUF: they solve different halves. Stripe bills humans; it cannot pay machine-to-machine and its fee floor kills sub-cent pricing. tryx402 executes micro-payments agent-to-API via x402 from $0.001, and adds the control layer (budget caps, ledger, no double charges) plus a fiat face so your users can still pay you through Stripe.
| Criterion | Stripe metered | tryx402 (x402 rail) |
|---|---|---|
| Payer | Humans with cards & contracts | Any agent, wallet-based, no account |
| Minimum viable price | ~$0.50+ (fixed fees dominate) | $0.001–$0.05 per call |
| Spend control | ✓ contractual / invoice-level | ✓ pre-authorized before every call |
| Double-charge protection | ✓ dispute/refund flow | ✓ idempotency keys (no refund needed) |
| Reporting granularity | Invoices & line items | Per-call ledger, live |
| Fiat UX for end users | Native | ✓ via built-in Stripe Checkout funding + margin engine |
| Custody / KYC for the caller | Full merchant account required | None on the rail side |
You get Stripe's trust at the human edge and x402's economics at the machine edge.
If your callers are companies subscribing monthly to fixed tiers and never making programmatic per-call payments, plain Stripe is simpler. The moment agents (yours or your customers') consume paid APIs call-by-call, the fee structure and lack of M2M rails work against you.