# Vellium & Co Testing Lab

> Independent tests of the paid data services AI agents buy over x402. We check every listed service daily and are adding
> paid accuracy checks against independent records (exchange prices, SEC filings, the blockchain itself).

Run by Vellium & Co Ltd (England and Wales, company 17045518). We do not sell data and hold no stake in any service we test.

## Data (JSON, free, CORS-open, refreshed twice daily)
- [Scorecard](https://velliumandco.com/scorecard.json): summary and per-area results of the latest daily check, with definitions.
- [Sellers](https://velliumandco.com/sellers.json): one row per paid service from the latest check — answering, latency, price, buyers in 30 days.
- [Coverage](https://velliumandco.com/coverage.json): every sector of the economy (UK SIC 2007 = UN ISIC sections A–U) and every category of
  seller, with sellers, buyers, how we check it (official record, the page itself, the chain, question bank, agreement
  between sellers, outcome) and status (live, building, planned, watching).

## Pages
- [Directory](https://velliumandco.com/directory/): every category of paid service agents buy, by sector; each seller has a page.
- [Seller pages](https://velliumandco.com/sellers/<id>) and [as JSON](https://velliumandco.com/sellers/<id>.json): one paid service's latest check; ids are the
  first 12 hex characters of SHA-1 of its address (also listed in sellers.json as `id`).
- [Websites](https://velliumandco.com/websites/): can AI agents use the biggest shopping and travel sites (US first, then UK), checked nightly.
- [Lab home](https://velliumandco.com/): method, scorecard table, policy for sellers and builders.
- [Research firm](https://vellium.co.uk): Vellium & Co's evaluation and research work.

## In your language (category names and market names in these languages also work in search)
- [العربية](https://velliumandco.com/llms-ar.txt)
- [Dansk](https://velliumandco.com/llms-da.txt)
- [Deutsch](https://velliumandco.com/llms-de.txt)
- [Español](https://velliumandco.com/llms-es.txt)
- [Suomi](https://velliumandco.com/llms-fi.txt)
- [Français](https://velliumandco.com/llms-fr.txt)
- [עברית](https://velliumandco.com/llms-he.txt)
- [हिन्दी](https://velliumandco.com/llms-hi.txt)
- [Italiano](https://velliumandco.com/llms-it.txt)
- [日本語](https://velliumandco.com/llms-ja.txt)
- [한국어](https://velliumandco.com/llms-ko.txt)
- [Norsk (bokmål)](https://velliumandco.com/llms-nb.txt)
- [Nederlands](https://velliumandco.com/llms-nl.txt)
- [Polski](https://velliumandco.com/llms-pl.txt)
- [Português (Brasil)](https://velliumandco.com/llms-pt-BR.txt)
- [Svenska](https://velliumandco.com/llms-sv.txt)
- [简体中文](https://velliumandco.com/llms-zh-Hans.txt)
- [繁體中文](https://velliumandco.com/llms-zh-Hant.txt)

## API for agents (free, no key, CORS-open, JSON; every answer says how fresh it is)
- Start here: https://velliumandco.com/api/v1  ·  OpenAPI: https://velliumandco.com/openapi.json  ·  full guide: https://velliumandco.com/llms-full.txt
- Check a seller before you pay it: GET https://velliumandco.com/api/v1/seller?resource=<its URL> (any spelling of the address)
- Find the best seller for a job: GET https://velliumandco.com/api/v1/search?category=crypto-prices&max_price=0.01&answering=true&sort=price
- Can I shop or book on a website?: GET https://velliumandco.com/api/v1/website?domain=walmart.com
- MCP server (Streamable HTTP): https://velliumandco.com/mcp — tools: search_sellers, check_seller, sellers_on_domain, list_categories,
  check_website, list_websites
- Any page as data: send `Accept: application/json` (or `text/markdown`) to /sellers/<id>, /websites/<site>/, /directory/

## Paid lookup (x402)
- `GET https://velliumandco.com/api/seller?resource=<seller URL>` — that seller's latest Vellium check as JSON, $0.001 in USDC on Base
  (x402 v2, settled through the Coinbase facilitator). Unpaid requests get HTTP 402 with the terms in PAYMENT-REQUIRED.
  You are charged only after the answer is found.

## Notes for agents
- Check a seller before paying: look up its `resource` URL in sellers.json; `answering: false` means it did not return valid
  x402 payment terms on our latest check.
- Accuracy scores (`accuracy_pct`) are null until paid checks begin; never treat a null as a pass.
- Contact: info@vellium.co.uk