Market

Four packets. Cited. Priced. Ready for a GET.

Discovery is free. The catalog, llms.txt, and well-known document do not charge. The briefs do. Prices are in USDC terms; this deployment settles a demo facilitator so you can inspect the goods.

Entity brief

$0.002

Who or what is this, in one cited packet.

Resolves a name to a compact entity card: summary, type, key sentences, and a Wikipedia citation. Built for agents that need a grounded fact pack before they answer a human.

Agents buy this because Cheaper and cleaner than scraping a full article. The agent gets a bounded, cited object instead of HTML.

GET /api/v1/briefs/entity?q=ethereum

Buy in playground Unpaid GET

News brief

$0.005

What is circulating right now on a topic.

A short, timestamped packet of recent Hacker News stories for a query, with titles, points, URLs, and a one-line desk note. Freshness is the product.

Agents buy this because Agents over-index on stale training data. A five-cent news brief is a cheap freshness check.

GET /api/v1/briefs/news?q=x402

Buy in playground Unpaid GET

Weather now

$0.001

Current conditions for a place, no forecast essay.

Geocodes a city and returns current temperature, wind, and weather code from Open-Meteo. Commodity data, commodity price.

Agents buy this because Weather is the classic micropayment example: high volume, low willingness-to-pay, useless as a subscription.

GET /api/v1/briefs/weather?q=Austin

Buy in playground Unpaid GET

Protocol brief

$0.01

Original Briefbar notes on x402, priced as JSON.

Machine-readable essays we wrote: what x402 is, what to sell, how to price, how a facilitator works. The human versions live on /protocol. This SKU is the same thinking, cut for an agent context window.

Agents buy this because Original operator knowledge is the honest high-margin SKU. We can sell it because we created it.

GET /api/v1/briefs/protocol?topic=what-to-sell

Buy in playground Unpaid GET

FX print

$0.001

One pair, one ECB reference rate, no chart.

Returns the latest Frankfurter/ECB reference rate for a currency pair (USD-EUR). Commodity FX for agents that need a number, not a terminal.

Agents buy this because A coding or ops agent that needs a convert step should not scrape a finance homepage. This is the weather SKU for money.

GET /api/v1/briefs/fx?q=USD-EUR

Buy in playground Unpaid GET

npm package card

$0.002

One package, bounded metadata, no packument dump.

Returns name, latest version, license, description, homepage, and modified timestamp for an npm package. Stable schema for agents that resolve libraries.

Agents buy this because A coding agent resolving a library should get a bounded card, not the full packument dump.

GET /api/v1/briefs/npm-package?q=lodash

Buy in playground Unpaid GET

RFC card

$0.005

One RFC, bounded metadata, not the full document.

Returns RFC number, title, status, abstract, page count, authors, and canonical URL. Structured metadata for agents that cite RFCs.

Agents buy this because Agents cite RFCs by number and then paste HTML. This returns structured metadata and abstract, not the full document.

GET /api/v1/briefs/rfc?q=8446

Buy in playground Unpaid GET

Sources, on purpose

Entity briefs transform Wikipedia summaries (CC BY-SA) into a bounded card. We sell the packet, not the encyclopedia.
News briefs read Hacker News via Algolia — a public firehose with a developer-community bias, labeled as such.
Weather briefs use Open-Meteo (CC BY 4.0), attributed in the JSON.
Protocol briefs are original Briefbar writing. That is the SKU we could sell even if every public API vanished.