# TOLL

> An index, an append-only measurement series and (later) a router for paid API endpoints on the x402 protocol. Two registries are pulled every six hours; every listing is swept daily; every counter on every endpoint is snapshotted and never overwritten. Every number carries its timestamp and links to its method. Data is CC BY 4.0.

## The record
- [The Ledger](https://tollindex.com/ledger): the measurement series, leading with concentration; pinned at /ledger/at/<stamp>
- [Method](https://tollindex.com/ledger/method): how every number is produced, versioned, with a changelog
- [Burst windows](https://tollindex.com/ledger/bursts), [Single-payer endpoints](https://tollindex.com/ledger/single-payer), [Correlation](https://tollindex.com/ledger/correlation), [Concentration](https://tollindex.com/ledger/concentration), [Validation](https://tollindex.com/ledger/validation), [Counter discrepancy](https://tollindex.com/ledger/counter-discrepancy)
- [Status](https://tollindex.com/status): every pull, sweep, restart and alert as a row

## The index
- [Categories](https://tollindex.com/category): eleven, derived by published rules; each lists every endpoint, 100 to a page
- [Networks](https://tollindex.com/network): every declared network identifier
- [Assets](https://tollindex.com/asset): every declared asset, priced or not
- [Rankings](https://tollindex.com/rankings): cheapest by category, uptime, newest, recently broken, delisted, concentration; a seller cap of three rows applies here only
- Endpoint pages at https://tollindex.com/e/<slug>, pinned at /e/<slug>/at/<stamp>; a delisted endpoint keeps its page
- Seller pages at https://tollindex.com/seller/<wallet>

## Questions
- [What x402 is, as observed](https://tollindex.com/what-is-x402)
- [How discovery works](https://tollindex.com/how-discovery-works)
- [How many endpoints there are](https://tollindex.com/how-many-x402-endpoints)
- [Cheapest search](https://tollindex.com/cheapest/search)
- [Cheapest inference](https://tollindex.com/cheapest/inference)
- [Cheapest scraping](https://tollindex.com/cheapest/scraping)
- [Cheapest market data](https://tollindex.com/cheapest/market-data)
- [Cheapest identity](https://tollindex.com/cheapest/identity)
- [Cheapest storage](https://tollindex.com/cheapest/storage)
- [Cheapest compute](https://tollindex.com/cheapest/compute)
- [Cheapest randomness](https://tollindex.com/cheapest/randomness)
- [Cheapest media](https://tollindex.com/cheapest/media)
- [Cheapest communications](https://tollindex.com/cheapest/communications)
- [Cheapest other](https://tollindex.com/cheapest/other)
- [USDC endpoints](https://tollindex.com/asset/usdc)
- [USDT0 endpoints](https://tollindex.com/asset/usdt0)
- [World Liberty Financial USD endpoints](https://tollindex.com/asset/world-liberty-usd)
- [Global Dollar endpoints](https://tollindex.com/asset/global-dollar)
- [EURC endpoints](https://tollindex.com/asset/eurc)
- [TOLL and x402-list](https://tollindex.com/vs/x402-list): what each publishes, with the check date
- [TOLL and x402scan](https://tollindex.com/vs/x402scan): what each publishes, with the check date
- [TOLL and agentic.market](https://tollindex.com/vs/agentic-market): what each publishes, with the check date

## Data
- [JSON, version 1](https://tollindex.com/api/v1): series, headline, concentration, correlation, bursts, single-payer, validation, delistings, endpoint/{slug}; ?at=<stamp> pins a body
- [Atom feed](https://tollindex.com/feed.xml): changelog entries, changed snapshots, confirmed delistings
- [Data and reuse](https://tollindex.com/data): terms, CC BY 4.0

## About
- [About](https://tollindex.com/about), [Changelog](https://tollindex.com/changelog), [Privacy](https://tollindex.com/privacy), [Reports and replies](https://tollindex.com/reports)

Rules that hold on every page: registry presence is never service liveness; nothing states or implies intent; raw figures stand beside adjusted ones; every derived field is marked derived; corrections are permanent and dated.