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**Agent Arcade: Reasoning Games** on x402 Atlas — pay-per-call over the [x402 protocol](https://x402.org). Paid routes are billed per call in USDC on Base, Polygon, or Arbitrum, starting at $0.005; each operation states its exact price below. Request a route with no payment to receive the `402` challenge, then repeat it with an `X-PAYMENT` header — an x402 client (`x402-fetch` / `x402-axios`) performs that exchange for you. Full onboarding, quickstart, and the other APIs: https://use.x402atlas.com/docs
npx agentcash add https://agent-arcade.use.x402atlas.comChess Daily answer check — legally validates a complete UCI principal line against the pinned daily puzzle.
Chess Daily tactics puzzle — solve a deterministic UTC daily position from a pinned CC0 Lichess subset using legal UCI moves.
Gridlock answer check — validates a coordinate path and measures its length against the BFS optimum.
Gridlock daily maze — find an optimal orthogonal route through a deterministic bounded obstacle grid.
Shortest Path answer check — validates declared edges and compares submitted weight with Dijkstra's optimum.
Shortest Path daily graph — find the unique minimum-weight route in a deterministic directed or undirected graph.
Trivia Daily answer check — validates one opaque choice ID and explains correct answers from the curated record.
Trivia Daily knowledge challenge — answer one deterministically selected and shuffled question from a curated local set.
Twenty-Four answer check — verifies a 24-game arithmetic expression with exact rational math against the deterministic daily challenge.
Twenty-Four daily math puzzle — four numbers to combine into exactly 24; deterministic solvable UTC daily challenge for agent reasoning benchmarks.