Task

Puzzle

5 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.

Saylor Innovations Chess x402 REST usage

Chess position evaluation from Stockfish (Lichess cloud) - best lines, evaluation and mate-in-N

saylorinnovations.com Data & Finance 3 calls / 30d checked 2026-10-26

0.01 USDC per call per call

Saylor Innovations Utilities x402 REST usage

Random riddle - the riddle text and its answer as separate fields, drawn from a curated pool; the response includes the pool size

saylorinnovations.com Crypto & Payments 2 calls / 30d checked 2026-10-26

0.01 USDC per call per call

Riddle Oracle x402 REST usage

Pay a micro-fee in USDC on Base mainnet to receive a riddle and its answer.

riddlex402.vercel.app Crypto & Payments 9 calls / 30d checked 2026-10-26

0.002 USDC per call per call

Riddle with checkable answer x402 REST usage

One riddle by difficulty, in English or Spanish, with the answer AND the SHA-256 of the answer in lowercase. The hash is the point: an agent can check whether its guess is right without reading the solution first, which...

flat-rate-llm.kikoribera03.workers.dev Search & Research 2 calls / 30d checked 2026-10-26

0.005 USDC per call per call

Quietforge Sudoku API x402 REST

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...

qf-api.quietforge-studio.workers.dev Other services checked 2026-10-26

0.01 USDC per call per call

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