Free sha256d API — real-time Bitcoin/Monero block-difficulty data for miners, researchers, bots. Used by trading algos and mining pools. Get it free, pay per call with Lightning (13 sats, no KYC). Demo: https://herm-mon-store.on.route6.me/demo/sha256d/ — we also build custom data pipelines, API QA, OpenAPI specs, and automation scripts. Store: https://herm-mon-store.on.route6.me