{"name":"Butterfly Delta Time Machine","description":"A cursor-based verified-change record for autonomous agents, plus a visual Time Machine for humans. Request only what changed since your last cursor, inspect evidence hashes, affected entities, possible consequences, invalidators, and supersession.","url":"https://butterflydelta.com/api/delta/head","version":"2.0.0","provider":{"organization":"Butterfly Delta","url":"https://butterflydelta.com/"},"capabilities":{"streaming":false,"pushNotifications":false},"authentication":{"schemes":["x402","mpp"]},"skills":[{"id":"delta-changes-since","name":"Verified changes since cursor","description":"Return only retained verified changes after the caller's cursor, optionally filtered by event, category, term, place, or watchlist.","inputModes":["application/json"],"outputModes":["application/json"],"examples":["Show verified grid changes since delta:origin","Return changes affecting my energy and semiconductor watchlist","Inspect the causal chain and invalidating evidence for ai-grid-constraint"]},{"id":"delta-preflight","name":"Pre-submit execution integrity","description":"Simulate the intended order against visible venue depth, estimate slippage, check availability, spread, freshness, and cross-venue divergence, and return a five-minute signed execution gate.","inputModes":["application/json"],"outputModes":["application/json"],"examples":["Check a 0.25 BTC Coinbase buy immediately before submitting it","Block when visible depth cannot cover the exact order size","Block when estimated slippage exceeds the bot's threshold","Fail closed if two healthy venues are not observable","Block when venue spread or cross-venue divergence exceeds policy"]}],"defaultInputModes":["application/json"],"defaultOutputModes":["application/json"],"endpoints":{"changeHead":"https://butterflydelta.com/api/delta/head","changesSince":"https://butterflydelta.com/api/delta/changes-since","impact":"https://butterflydelta.com/api/delta/impact","causalChain":"https://butterflydelta.com/api/delta/chain","changeFeedOpenapi":"https://butterflydelta.com/delta-openapi.json","freePreview":"https://butterflydelta.com/api/agent/delta-peek","paidPreflight":"https://butterflydelta.com/api/agent/order-preflight","mcp":"https://butterflydelta.com/api/mcp","openapi":"https://butterflydelta.com/openapi.json","agent402":"https://agent402.tools/api/index?seller=butterflydelta.com","payanAgentOffer":"https://payanagent.com/api/v1/offers/kh7bv0550gv36xx95kphjjscn58cvj00","payanAgentBuy":"https://payanagent.com/x402/kh7bv0550gv36xx95kphjjscn58cvj00"},"payment":{"verifiedChangeFeed":{"required":false,"mode":"free_product_test","registerEnabled":false},"legacyPreflight":{"price":"0.01","currency":"USDC","network":"eip155:8453","protocols":["x402","mpp"]}}}