x402 List
x402 List is a directory of services and APIs that accept x402 payments. Its own site describes it as independent and curated by hand, tracking each listed service's endpoint pricing, monitored availability and observed settlement activity.
A service enters the directory by submission or by import from a public index, and the site states that nothing is listed without a live HTTP 402 challenge and a manual review. Each listing carries a badge derived from the directory's own probes: one tier for an endpoint that answers a well-formed x402 challenge, and a stronger tier earned when a paid call made by the directory is delivered.
It also publishes a table of facilitators, with USDC settlement volume that its site says is read on chain and is not reported by the facilitators. The site states that its figures describe listed services and the networks it measures, and are not a total for the whole x402 ecosystem.
A settlement register is a public table that attributes on-chain payments to the facilitators that submitted them and publishes a total for each. This is one.
→ probe402 quotes the totals this register published, with their date and source, in this issue of the Machine Commerce Reality Index.
Sources
Related x402 Trust · x402scan · facilitator · discovery