{"slug":"bild-halowerk-com-v1-noise-estimate-37946876","name":"bild.halowerk.com/v1/noise-estimate","summary":"Uses the fast noise variance estimator of Immerkær (1996): the image is convolved with the 3×3 mask [1 −2 1; −2 4 −2; 1 −2 1], which cancels linear structure, and sigma = sqrt(π/2) · Σ|response| / (6·(W−2)(H−2)). Computed for BT.601 luma, the R, G and B channels and the JPEG Cb/Cr chroma planes. Because edges inflate the estimate, a second luma value excludes the 10 % of pixels with the strongest Sobel gradient (Tai & Yang 2008), and a tile median over up to 8×8 tiles is given.","status":"live","headings":[],"indexable":true,"listed_since":"2026-11-13T10:28:17.808015Z","sources":[{"source":"x402_bazaar","external_id":"https://bild.halowerk.com/v1/noise-estimate","owner_address":"0x2880edfff13100677bf97a3cbdf3bc34771c4e5e","seen_at":"2026-11-15T10:34:56.073465Z","removed_at":null}],"endpoints":[{"url":"https://bild.halowerk.com/v1/noise-estimate","host":"bild.halowerk.com","protocol":"x402","state":"live","last_probe_at":"2026-11-15T11:00:31.744591Z","last_ok_at":"2026-11-15T11:00:31.744591Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"bild-halowerk-com-4d9a40d1","name":"bild.halowerk.com"}],"payment_options":[{"endpoint_url":"https://bild.halowerk.com/v1/noise-estimate","network":"eip155:8453","scheme":"exact","rail":"exact","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","coin":"USDC","asset_label":"USD Coin","amount":"4000","pay_to":"0x2880edfff13100677bf97a3cbdf3bc34771c4e5e","observed_at":"2026-11-15T11:00:31.744591Z"}],"usage":{"source":"x402_bazaar","unique_payers_30d":1,"paid_calls_30d":1,"last_paid_at":"2026-11-12T22:25:22.307Z","reported_at":"2026-11-15T10:34:56.073465Z"},"assessment":{"method":"2026.11.4","checks":[{"id":"answers","state":"pass","reason":"Answered a check 2 hours ago."},{"id":"owner","state":"fail","reason":"No one has proven control of its domain or of the wallet it is paid at."},{"id":"track_record","state":"fail","reason":"Listed for 1 days; 30 are needed."},{"id":"real_customers","state":"fail","reason":"1 different wallets paid it in 30 days, as the x402 Bazaar reports (not yet counted by addrbook); 10 are needed."},{"id":"clean_scan","state":"not_applicable","reason":"Not an MCP server."}],"passed":1,"applicable":4,"contradicted":false,"computed_at":"2026-11-15T00:39:15.534937Z"},"identity":{"endpoint_domains":["halowerk.com"],"proven_domains":[],"proven_wallets":[],"namesakes":[],"namesake_count":0,"identity_checks":[],"wallet_attestations":[],"human_backings":[]},"replies":[],"customers":null,"scan":null,"notice":"Not affiliated with addrbook — claim or request removal."}