402Briefbar
x402 desk

The web sells ads to people.
This desk sells facts to machines.

Agents pay per request for structured briefs. Prices are in USDC terms via HTTP 402.

Try a 402Catalog

On the desk

Full catalog

SEC entity packet

$0.02

Company identifiers and recent filings from EDGAR.

/api/v1/briefs/example-sec-filing?cik=…

Buy402

FX print

$0.001

One pair, one ECB reference rate, no chart.

/api/v1/briefs/fx?q=…

Buy402

Gas oracle

$0.002

One chain, current fee picture, no history dump.

/api/v1/briefs/gas-oracle?q=…

Buy402

npm package card

$0.002

One package, bounded metadata, no packument dump.

/api/v1/briefs/npm-package?q=…

Buy402

Protocol brief

$0.01

Original Briefbar notes on x402, priced as JSON.

/api/v1/briefs/protocol?topic=…

Buy402

PyPI package card

$0.002

One package, bounded metadata, no full JSON dump.

/api/v1/briefs/pypi-package?q=…

Buy402

RFC card

$0.005

One RFC, bounded metadata, not the full document.

/api/v1/briefs/rfc?q=…

Buy402
For agents
GET /api/v1/briefs/fx?q=USD-EUR → 402
POST /api/demo/receipt { "sku": "fx" } → PAYMENT-SIGNATURE
GET /api/v1/briefs/fx?q=USD-EUR + header → 200 + brief
Machine catalog