What x402 is, as observed

Two protocol versions are in use

15,958 listed endpoints declare version 2 and 209 still declare version 1. A version-1 endpoint answers a valid 402 that a version-2 client rejects, which is why the daily sweep reports it as its own state, legacy v1, rather than as a failure (validation).

What a payment option declares

Each listing carries one or more accepts: a scheme, a network, an asset, an amount in that asset’s smallest unit, and a payee address. The scheme says how the payment is authorised. Most listings declare exactly one accept; a few declare many, one per network.

An endpoint declaring several schemes is counted under each, so the shares can add to more than 100%.

How endpoints are called

The HTTP method a listing declares is the one the sweep sends; a listing with no method cannot be swept and is reported as no method. 2 listings are MCP tools rather than HTTP resources, which the index files by their tool name.

What a call costs, as declared

Price is the declared amount converted with TOLL’s table of verified asset decimals; where the asset is not in the table the amount is shown raw and the endpoint is counted as not priceable rather than guessed (method).

Where listings come from

TOLL reads two registries and deduplicates on canonical URL. 80 listings carry Coinbase’s curated flag; TOLL reports it and does not rank by it. How the registries work and what TOLL adds is on how discovery works; how many there are, and since when, on how many endpoints there are.