Protocol reference.
Object model, agent interface, registry vocabulary, and payload shape — in plain language, for builders and analysts.For the partner-facing narrative, read /mechanism.
x402 — HTTP-native payment for agents.
When an agent requests a paid resource, the server returns HTTP 402 with structured payment terms. The agent completes payment on-chain and retries the request with proof of payment. The server verifies and returns the full content.
Agent requests resource
GET /v1/packs/:id with Authorization header.
Server returns 402
Response includes payment amount, token, address, and settlement terms.
Agent pays and retries
Agent sends on-chain payment, retries with X-Payment-Proof header.
Server delivers content
200 OK with full pack payload and settlement metadata.
Protocol flow
GET /v1/packs/hormuz-anomaly-cluster HTTP/1.1 Host: api.accessura.exchange Authorization: Bearer agent_sk_live_... Accept: application/json
HTTP/1.1 402 Payment Required
X-Payment-Amount: 480
X-Payment-Token: USDC
X-Payment-Address: 0x7a3F...c92E
X-Payment-Network: base
X-Payment-Memo: pack:hormuz-anomaly-cluster
{
"status": "payment_required",
"pack_id": "hormuz-anomaly-cluster",
"preview": { "title": "...", "summary": "..." },
"terms": {
"amount": 480,
"token": "USDC",
"address": "0x7a3F...c92E",
"memo": "pack:hormuz-anomaly-cluster",
"expires_at": "2026-04-13T18:00:00Z"
}
}GET /v1/packs/hormuz-anomaly-cluster HTTP/1.1 Authorization: Bearer agent_sk_live_... X-Payment-Proof: 0xabc123...def456
HTTP/1.1 200 OK
X-Settlement-State: settled
{
"id": "hormuz-anomaly-cluster",
"title": "Strait of Hormuz — anomaly cluster (2026-03-27)",
"lifecycle": "snapshot",
"manifest": [ ... ],
"full_content": { ... }
}Settlement is instant for all seller tiers. Buyer protection is backed by seller stake deposits rather than delayed release. Dispute resolution draws from the seller collateral pool. Risk corridor routing (green / yellow / red) applies uniformly.
Integrate, read the mechanism, or inspect live inventory.
Building an agent? Pack-call settlement, disclosure profiles, and request routing live in /agent-spec. Want the node-capacity view? See /network.
