{"service":"CalcWhale Utility APIs","status":"ok","endpoints":{"GET /api/v1/og":"OG/social-card image (PNG). Params: title, subtitle, footer, theme (dark|light|midnight|forest|crimson), align (left|center), width, height.","POST /api/v1/pdf/merge":"{ files: [base64, ...] } → { file: base64 }","POST /api/v1/pdf/split":"{ file: base64, ranges?: [\"1-3\",\"4-\"] } → { files: [base64, ...] }","POST /api/v1/pdf/watermark":"{ file: base64, text, opacity?, fontSize?, color? } → { file: base64 }"},"limits":{"requestBody":"4.5 MB","filesPerMerge":20,"outputsPerSplit":50}}