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X40
x402 payment rail
payment rail · week 2026-W36
- One unit is
- one settlement (a machine paying a machine for an HTTP request)
- Entry costs
- n/a — a rail, not a registry
What we measured
Base
Settlements to catalogued sellersUSDC transfer to a catalogued x402 seller payTo
135,166Indicator
Sellers actually paidcatalogued x402 seller payTo that received at least one USDC transfer in the window
78.3%785Indicator
Share of gasless USDC attributable to x402percent of sampled gasless USDC settlements attributable to a catalogued x402 seller
0.5%23.4%n=4682Inference
- A transfer to a seller's payTo address is strong evidence of an x402 payment, not proof of one — the same address can receive ordinary transfers. Base only; x402 also settles on Solana, which no method here can see.
- Sampled: 2400 of 302400 blocks (0.79%). This is an estimate, not a count. EIP-3009 marks gasless USDC generally, not x402 specifically, so the denominator is everything gasless — which is why this rate is the honest headline rather than the raw settlement count.
- Out of 1002 catalogued EVM payTo addresses. Receiving USDC is evidence of a paying customer, not proof the payment came through x402.
venue-level
Catalogued sellersdistinct seller host in the Bazaar catalog
1,656Proof
- 1002 of these declare an EVM payTo address; 33 declare a non-EVM one (Solana and others) and are outside every method in this collector.
Confirmed contracts
Every address here was confirmed on-chain twice: bytecode present, and the block explorer's verified contract name matching the claim. A confirmation older than the re-check interval renders as stale rather than as a number that looks current.
| Chain | Contract | Role | Confirmed |
|---|---|---|---|
| Arbitrum | x402ExactPermit2Proxy0x402085c248EeA27D92E8b30b2C58ed07f9E20001 | settlement-proxy | 2026-09-01 · source |
| Base | x402ExactPermit2Proxy0x402085c248EeA27D92E8b30b2C58ed07f9E20001 | settlement-proxy | 2026-09-01 · source |
| Ethereum | x402ExactPermit2Proxy0x402085c248EeA27D92E8b30b2C58ed07f9E20001 | settlement-proxy | 2026-09-01 · source |
| Polygon | x402ExactPermit2Proxy0x402085c248EeA27D92E8b30b2C58ed07f9E20001 | settlement-proxy | 2026-09-01 · source |
What this page cannot settle
- The signature marks gasless USDC generally, not x402 specifically. Precision comes from off-chain lists that lag. Recent transaction COUNT is ~95% Solana across ~104 sellers at a sub-cent median — never headline the blended total.
- Headline safety: Only per-chain and per-stage, never the blended protocol-wide total.
- Every method here is EVM-shaped. Solana is not covered by any measurement on this page.
In the directory as x402.