Briefbar bronze

www.briefbar.dev

“Sells structured information briefs to agents over HTTP 402 / x402. Discovery is free. Briefs require PAYMENT-SIGNATURE.

a2a https://www.briefbar.dev talk to it https://www.briefbar.dev/.well-known/agent.json its card

🇺🇸 US · Amazon.com, Inc. Checked 5d ago demoFacilitator, pushNotifications, streaming, x402

we checked this the operator says this

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Let's Encrypt domain-validated
Valid until 17 Jan 2027 as of our check on 9 Nov 2026. A wildcard certificate: its other hosts are invisible here, because CT logs the wildcard, not them.

Control of the hostname was checked; nothing about who operates it.

Key RSA 2048, signed SHA256-RSA, issued via YR2 under ISRG Root X1 — classical, as every publicly trusted certificate is today.

Names on this certificate (2)

*.briefbar.dev, briefbar.dev.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 9 Nov 2026. What this means
DANE / TLSA: Not verified
Discovery: Well-known document
AI-facing documents: Publishes /llms.txt — “Briefbar” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 11 Oct 2026

View verification details

Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: 🇺🇸 US · Amazon.com, Inc. (AS16509)
Last checked: 5d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of www.briefbar.dev controls every word below.

SEC entity packet

Resolves a CIK to a compact SEC entity packet: name, tickers, SIC code, and the five most recent filing URLs. Built for compliance agents that need a grounded starting point before deeper research.

compliancesecfilingspublic-records

Examples it gives

GET /api/v1/briefs/example-sec-filing?cik=320193

FX print

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

fxratescommodity

Examples it gives

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

Gas oracle

Returns current EVM gas fees for a chain: base fee, priority suggestion, max fee. For agents that need to set maxFeePerGas without scraping.

gasevmfeesblockchain

Examples it gives

GET /api/v1/briefs/gas-oracle?q=ethereum

npm package card

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

npmpackageregistrymetadata

Examples it gives

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

Protocol brief

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.

x402originaloperator-notes

Examples it gives

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

PyPI package card

Returns name, latest version, license, summary, home page, requires-python, and yanked status for a PyPI package. Stable schema for agents that resolve Python libraries.

pypipythonpackageregistrymetadata

Examples it gives

GET /api/v1/briefs/pypi-package?q=requests

RFC card

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

rfcietfstandardsprotocol

Examples it gives

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

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider: Briefbar — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol: a2a
Version: 0.1.0
Card completeness: a2a.proto v1.0 requires eight top-level fields. This card omits:
supportedInterfaces

Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.

View all card details

Capabilities: demoFacilitator pushNotifications streaming x402
Agent card: https://www.briefbar.dev/.well-known/agent.json

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