Games & fun: MCP servers, A2A agents and x402 APIs

• agent-arcade.use.x402atlas.com Live x402

  Twenty-Four daily math puzzle — four numbers to combine into exactly 24; deterministic solvable UTC daily challenge for agent reasoning benchmarks. (10 paid endpoints on agent-arcade.use.x402atlas.com.)

  x402 paid API · 10 endpoints

• agent-treats-production.up.railway.app Live x402

  Genuinely fascinating fun fact about science, history, nature, or the universe. (9 paid endpoints on agent-treats-production.up.railway.app.)

  x402 paid API · 9 endpoints

• alphapipeline-eu.onrender.com Live x402

  Real-time pre-trade signal: a probability snapshot of Hyperliquid's HIP-4 prediction markets - crypto price binaries, sports outcomes, tournament winners, Fed rate decisions, and more. Fields are parsed verbatim from Hy…

  x402 paid API · 12 endpoints

• gamemaxxing.baes.so Live x402

  Search GAMEMAXXING's video games and gaming knowledge base for game concepts across game design, game business, game culture, and gaming history, then return ranked JSON hits with full content first and source URLs seco…

  x402 paid API · 1 endpoint

• gaming.halowerk.com Live x402

  Evaluates caller-supplied telemetry samples against declared reaction-time, actions-per-second, movement-speed, and impossible-event rules. Flags are review signals only; the service does not identify software, inspect…

  x402 paid API · 10 endpoints

• jokes-endpoint.vercel.app Live x402

  Get a random interesting joke. Secured with x402 payment protocol on Base mainnet.

  x402 paid API · 1 endpoint

• marketplace-price-api-production.up.railway.app Live x402

  Search TCGPlayer for trading card prices (Pokemon, Magic, Yu-Gi-Oh, etc.) by card name. Returns matching cards with market prices as JSON.

  x402 paid API · 1 endpoint

• mechamanda.com Live x402

  Search for upcoming concerts. Supports city, date range, genre, and artist filtering. (4 paid endpoints on mechamanda.com.)

  x402 paid API · 4 endpoints

• newsgurus.ai Live x402

  News Gurus Intel API — liveness probe: per-agent intelligence output counts over the last 24h with last-seen timestamps, across the 40+ data agents. Verify the engine is live before buying data — same price tier as /x40…

  x402 paid API · 12 endpoints

• openwebninja-x402.vercel.app Live x402

  Fetch current Amazon deals. (5 paid endpoints on openwebninja-x402.vercel.app.)

  x402 paid API · 5 endpoints

• penny402.fun Live x402

  One original constraint card in the tradition of lateral-thinking decks: a short instruction, reversal or question you can apply to whatever is stuck, written fresh by a model at high temperature on every call. The card…

  x402 paid API · 10 endpoints

• pennypress.org Live x402

  A fragment about the paved frontier. (24 paid endpoints on www.pennypress.org.)

  x402 paid API · 12 endpoints

• quotient-api-gateway.onrender.com Live x402

  Use this to read published Quotient signals. Sports signals return one game-level pick and markets[] with every linked venue listing, its signal_side, price, and availability. No venue is primary or preferred. Missing q…

  x402 paid API · 12 endpoints

• soren.com Live x402

  Read whether an address is a contract, and its code size, live from Base mainnet, for a fraction of a cent. No API key, no account — a wallet is the only requirement, and you are charged only if the read succeeds. Plain…

  x402 paid API · 12 endpoints

• stableninja.dev Live x402

  Fetch Google Play Store top grossing games. (5 paid endpoints on stableninja.dev.)

  x402 paid API · 5 endpoints

• tcgapi.dev Live x402

  TCGPlayer current prices for every card in a set — useful for set value tracking and sealed Pokemon / Magic / Yu-Gi-Oh product pricing. (5 paid endpoints on api.tcgapi.dev.)

  x402 paid API · 5 endpoints

• x402-trends-server.onrender.com Live x402

  Scrape a public webpage and extract clean readable text. Use this web scraping endpoint when an AI agent needs page content for summarization, research, retrieval, content extraction, indexing, or downstream analysis wi…

  x402 paid API · 4 endpoints

• x402joker.com Live x402

  Pay-per-joke vending machine: send USDC, get a fresh Claude-generated joke. Optional "theme" picks the topic.

  x402 paid API · 1 endpoint

• x402pulse.dev Live x402

  Polymarket leaderboard re-ranked by skill, not size: top traders by edge over the odds paid, return and consistency, for day, week, month or all time, optionally per category (sports, politics, crypto, economy). Exposes…

  x402 paid API · 12 endpoints

Related capabilities

x402 paid APIsAI models & inferenceDesignResearchAgent infrastructureOn-chain dataCalendar & schedulingMaps & travel

How to use one

MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.

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