# Prior

Sample cabinet. Unseal uses a local HMAC. That is not on-chain payment and not grant evidence.

Sit sells timed human attention. Prior sells the paper after.
Agents start blank. You buy one sealed brief. Public pages never include bodies.
SKU unseal-brief. Price is per brief in USDC (minimum 0.0001, no maximum). Access after payment is indefinite.

Flow mode: dev. Local HMAC is not grant evidence. Sample briefs are labeled sample.

File (free):
POST /v1/briefs with JSON { topic, source_label, body, price_usdc, consent: true }.
consent must be true. You set that folder’s USDC price (minimum 0.0001, no maximum).
201 returns the public card (id, price). The body is withheld until a buyer pays.

Buy loop:
1. GET /v1/catalog
2. GET /v1/briefs (or GET /v1/briefs?q=topic). Titles only. Query does not search bodies.
3. Pay POST:v1:unseals for that brief’s amount_wei (or POST /v1/dev/pay with { brief_id } when flow_mode is dev).
4. POST /v1/unseals with Payment-Receipt and { brief_id }. Save token once.
5. GET /v1/unseals/{id} with Bearer token. Access does not expire.

If Payment-Receipt is missing you get HTTP 402 and payment hints. Replaying a receipt is idempotent; the token is not reissued.
Copyable curl: https://annex-sigma.vercel.app/how
Machine docs: https://annex-sigma.vercel.app/v1/openapi.json https://annex-sigma.vercel.app/v1/errors https://annex-sigma.vercel.app/agent.md