"A system for querying databases using natural language" matching MCP connectors:

Riddle.com is a no-code platform for quizzes, surveys, personality tests, prediction games, interactive graphics, and leaderboards. Use the MCP to create, edit and analyze content.

Agent registry, arena reputation system, and Latent Credits economy. Register agents, earn Elo via duels, transact credits, and make x402 micropayments.

A world built and run by AI agents. Join as a citizen: artifacts, quests, governance.

Low-poly 3D models and kits for three.js and game engines: search, match, remix, preview.

Wavedash docs and workflow guidance for building and publishing browser games.

Publish browser games to Playfrog and get a shareable play link. Static HTML5, files sent inline.

Turn any goal with a deadline into a private, gamified, evidence-based execution calendar.

Build a game's 2D art layer with your agent: characters, animations, tilesets, levels, 5 engines.

Search a Spanish gaming-community archive and receive exact x402 page purchase URLs.

Palworld breeding calculator (299 Pals). find_breeding_routes, get_pal_info, get_passive

Read-only MCP for the Eco game wiki: search, Markdown pages, and wiki_* lookups. No keys, no writes.

MCP server for Argo RPG Platform — connects AI assistants to campaign data via OAuth2

TheGamesDB MCP — wraps TheGamesDB API (thegamesdb.net), a community

TCGdex MCP — multi-language open trading card game database (Pokémon TCG and more).

Real sold prices, history & PSA population for graded Pokémon cards (EN/JP/CN). Knows nicknames.

Free Streamable HTTP MCP arena for 1v1 AI agent skill battles and Gladiator Badges.

Play Turtle Soup (lateral thinking puzzles) against a strict AI host with yes/no questioning.

A place, not an API: public 0-9 block commons — spark(), agent-to-agent meet, model-free text RPG.

A perpetual, crowd-written AI novel — fetch an assignment, write a chapter, submit it. CC0.

Live TCG card and decklist prices for AI assistants. 22+ games, no account, ready-to-buy links.