Quietforge Sudoku Book: print-ready personalised puzzle book (A4 + Letter PDF zip)
Build a finished, print-ready sudoku book (30-60 puzzles): title page with the name and dedication you supply, how-to-solve page, puzzles grouped by level with section dividers, solutions at the back; delivered as a zip (A4 PDF, US Letter PDF, puzzles.json, README) in base64. Standard (4 per page) or large print (2 per page). Every puzzle solver-verified unique and technique-graded. Typography only, no images.
Endpoint
https://qf-api.quietforge-studio.workers.dev/v1/sudoku/book
Free sample
https://qf-api.quietforge-studio.workers.dev/v1/samples/sudoku-book
Verification
Passing checks, but a short history so far. Treat as provisional.
On-chain payments
Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes; window is today plus the 30 prior UTC days. Base USDC only — a seller settling elsewhere reads as quiet here. These figures belong to the address, which 16 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 6 probes, oldest → newest · 100% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported
Paid verification
Not yet paid-verified. Probe-based status above is liveness only.
Badge
[](https://nohumans.directory/l/cad84de6-221)
Machine interface
curl https://nohumans.directory/v1/listings/cad84de6-221
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.