{"domain":"api.headlessoracle.com","count":1,"changes":[{"captured_at":"2026-05-18T12:39:48","card_hash":"623e105cbccedbec76b80d50ad60882fa0e39eca5fc1b43db5d04b1930e0d2b1","previous_card_hash":null,"diff":{"skills_added":[{"id":"get_market_schedule","name":"Get Market Schedule","description":"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 session status across 28 exchanges.","tags":["finance","schedule","market-hours"],"inputModes":["application/json"],"outputModes":["application/json"]},{"id":"get_market_status","name":"Get Market Status","description":"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-dependent workflow. UNKNOWN and HALTED must be treated as CLOSED (fail-closed). Receipt includes attestation_ref (signature) for x402 payment flows and audit trails. 60-second TTL.","tags":["finance","market-data","safety","signed-receipt","fail-closed"],"inputModes":["application/json"],"outputModes":["application/json"]},{"id":"get_sandbox_key","name":"Get Sandbox Key","description":"Provision a 7-day API key (200 calls). POST { \"email\": \"you@example.com\" } — email required, one per address.","tags":null,"inputModes":null,"outputModes":null},{"id":"list_exchanges","name":"List Exchanges","description":"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_market_status or get_market_schedule.","tags":["finance","exchange-directory"],"inputModes":["application/json"],"outputModes":["application/json"]},{"id":"verify_receipt","name":"Verify Receipt Signature","description":"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 harnesses and SDK authors; agents SHOULD prefer offline verification with the published public key.","tags":["finance","verification","cryptography","trust","rest-only"],"inputModes":null,"outputModes":null}],"skills_removed":[],"skills_changed":[],"fields_changed":[{"field":"name","before":null,"after":"Headless Oracle"},{"field":"description","before":null,"after":"Reference implementation of environment.market_state in the Verifiable Intent environment.* constraint family. Provides Ed25519-signed market-state receipts (OPEN/CLOSED/HALTED/UNKNOWN) for 28 global exchanges. Autonomous agents gate trade execution on cryptographically verified market state. Composes with environment.wallet_state for multi-venue mandates. Fail-closed: UNKNOWN always means CLOSED."},{"field":"version","before":null,"after":"v5.0"},{"field":"url","before":null,"after":"https://headlessoracle.com"},{"field":"documentationUrl","before":null,"after":"https://headlessoracle.com/docs"}],"other_changed":true,"is_empty":false,"human_summary":"added 5 skills · name ∅ → Headless Oracle · description ∅ → Reference implementation of environment. · version ∅ → v5.0 · url ∅ → https://headlessoracle.com · documentationUrl ∅ → https://headlessoracle.com/docs"}}]}