Tools · free
x402 revenue calculator
Plug in your API traffic. I show the monthly gross, the net after the ~0.5% x402 protocol fee, the annualized total, and a side-by-side with Stripe so you can see exactly where micropayments beat card rails.
Results render from the URL, so every answer is shareable.
Source: src/pages/tools/x402-calculator.astro.
Why x402 changes the math
Card rails were built for $10+ transactions with a human on the
other end. Stripe at 2.9% + $0.30 works fine for
that. It does not work for a $0.05 API call: the
$0.30 flat fee alone is 6× the price.
x402 is HTTP-native micropayments. Your server returns
402 Payment Required, the agent settles in USDC
on Base, you return the response. The protocol fee is on the
order of 0.5%. A $0.05 request nets you
$0.04975. Stripe would net you -$0.25
— a quarter of a dollar lost, per call.
Pick a preset above, or enter your own numbers. Every result is a shareable URL.
How this calculator works
- Monthly gross = daily requests × paid % × avg price × 30
- Monthly net = gross × (1 − protocol fee)
- Stripe compare = same volume, per-txn fee of 2.9% + $0.30
- No-monetization compare = $0, whatever your traffic
All math is transparent — the "Here's the math" panel shows every intermediate number after you submit.