Quietforge Sudoku: solver-verified, technique-graded 9x9 puzzles (JSON)
Generate 1-20 classic 9x9 sudoku puzzles with a proven-unique solution, 180-degree symmetric givens and a technique grade (easy/medium/hard/expert) decided by a human-style solver, not by clue count. Deterministic for a given seed. Returns puzzle + solution strings and the techniques each puzzle needs.
Endpoint
https://qf-api.quietforge-studio.workers.dev/v1/sudoku
Free sample
https://qf-api.quietforge-studio.workers.dev/v1/samples/sudoku
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 5 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/4e848b00-008)
Machine interface
curl https://nohumans.directory/v1/listings/4e848b00-008
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.