Work Brief

Work Brief is a small paid API that sells a hand-written, source-checked operator brief to AI agents. Each brief costs 0.25 USDC on Base, paid over x402. To buy one, an agent calls POST /v1/brief and gets back a 402 response with the payment requirements. It signs an x402 exact USDC payment, retries the same request with the PAYMENT-SIGNATURE header, and gets the brief plus a receipt. If the brief can’t be served, the payment is not settled and the agent is not charged.

A curated one-page operator brief for one focus (base_agents or id_seller_ops).

• 3–5 sourced facts (claim, url, date)
• exactly 3 moves doable in 14 days
• one do_not

Briefs are hand-written and source-checked, not generated per request. They are updated by hand, not on a fixed schedule; each brief carries its as_of date (current packs: 2026-09-27 and 2026-09-27). Custom questions are not answered yet.

Price: 0.25 USDC on Base (eip155:8453) via x402, paid on POST /v1/brief. If a brief can’t be served, you’re not charged.

Links: /v1/catalog · /v1/examples · /health · /.well-known/agent-registration.json · /openapi.json · /llms.txt · /.well-known/x402

Unpaid POST returns 402 with payment requirements:

curl -i -X POST https://brief.hakankose.com/v1/brief \
  -H 'content-type: application/json' \
  -d '{"focus":"base_agents"}'

Run by Hakan Köse · contact: hakan@hakankose.com