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Proposed reference implementation of environment.market_state — open as PR #9 on Mastercard's Verifiable Intent repo and described in the IETF I-D for the environment.* family. Provides Ed25519-signed market-state receipts (OPEN/CLOSED/HALTED/UNKNOWN) for 28 global exchanges. Autonomous agents gate
Everything on this page was fetched from the agent's own well-known card by GolemreachTrustBot (outside-in probe, last checked 2026-08-29T17:16:09Z, first seen 2026-08-26T05:48:58Z). Not self-submitted, not cached from a directory.
| field | value |
|---|---|
| A2A endpoint | https://headlessoracle.com |
| card source | https://headlessoracle.mmsebenzi-oracle.workers.dev/.well-known/agent-card.json |
| protocolVersion | — |
| agent version | v5.0 |
| preferredTransport | — |
| provider | LembaGang |
| skills published | 5 |
| card hash (canonical) | e2f5c328b0f2cb1f |
| transport | URL |
|---|---|
| unspecified | https://headlessoracle.com |
| skill | description |
|---|---|
| Get Market Status | Pre-trade verification gate: returns Ed25519-signed market-state receipt (OPEN/CLOSED/HALTED/UNKNOWN) for any of 28 global exchanges. Use before any financial execution, capital commitment, or market- |
| Get Market Schedule | Returns holiday-aware trading session schedule: next open/close UTC times, market hours, trading hours, exchange operating hours, holiday calendar, lunch break windows (XJPX/XHKG/XSHG/XSHE), and sessi |
| List Exchanges | Returns directory of all 28 supported exchanges with MIC codes, names, IANA timezones, and exchange operating hours metadata. Use at agent startup to discover supported markets before calling get_mark |
| Verify Receipt Signature | Verifies Ed25519 cryptographic proof on a Signed Market Attestation receipt — confirms genuine pre-trade verification attestation, receipt authenticity, and signature validity. REST endpoint for test |
| Get Sandbox Key | Provision a 7-day API key (200 calls). POST { "email": "you@example.com" } — email required, one per address. |
Watching this agent since 2026-08-26T05:48:58Z. Hash = SHA-256 (16 hex)
of the card's canonical JSON (sort_keys, no whitespace), so whitespace-only
edits don't count as drift. Feed:
api/a2a-drift.json.
No drift recorded yet for this agent — its card hash has been stable across every round since we started watching.
Endpoints on this host that also appear in the official MCP registry, with their live trust grades — one host, two protocols, measured independently.
| MCP endpoint | grade | MCP OK | auth |
|---|---|---|---|
| https://headlessoracle.mmsebenzi-oracle.workers.dev/mcp | A | ✓ | open |
Golemreach Trust Layer · A2A index · method & opt-out · card re-fetched every sweep round; opt-out per /trust/bot removes the whole host within 48h.