Show HN: SFXMint – CC0 game SFX with a keyless API and MCP for coding agents

SFXMint launched a library of more than 9,700 CC0-licensed sound effects that developers can pull into projects through a keyless REST API or a Model Context Protocol (MCP) server, letting coding agents such as Claude Code, Cursor and Codex fetch sounds while they write games. The service allows 3 library downloads a day without an account, and its AI Studio generates new sounds free to make and hear at 3 a day, with commercial CC0 use costing one credit per generation. SFXMint notes the sounds are AI-generated and that Steam's Content Survey asks developers about AI-made content.

Free Sound Effects 9,700+ CC0 sounds, free to use in videos, games and apps — no signup. When you need one the library doesn't have, AI Studio makes it. Popular sound effects Most downloaded in the last two weeks The free library All 23 categories categories Featured sounds Smooth 8-Bit Video Game Jump 01 https://sfxmint.com/sounds/retro-game-jump-01 0.235s · An 8-bit video game jump plays smoothly, for jumping characters. Double-Chime 8-Bit Coin Pickup 52 No Reverb https://sfxmint.com/sounds/retro-game-coin-52 1.06s · An 8-bit coin cue chimes twice, for coin pickups. Heavy Pressure Plate Click 03 https://sfxmint.com/sounds/pressure-plate-click-03 0.060s · A heavy stone and metal pressure plate depresses once with a compact latch click, for dungeon traps. Rising Fading Wolf Howl 02 https://sfxmint.com/sounds/wolf-howl-02 5.96s · A wolf gives one sustained howl that rises and fades, for night forests. Short Video Whoosh 01 https://sfxmint.com/sounds/short-video-whoosh-01 0.601s · Short whoosh option for video transitions. Preview in context to choose. Acoustic Kick Drum — Single Hit https://sfxmint.com/sounds/acoustic-drum-kit-kick-01 Instrument hits · 0.280s All categories Browse by use case → https://sfxmint.com/roles Find a sound by what happens Free CC0 sound effects for games, videos and apps. Play any file in your browser, then download the WAV or MP3: no signup, no attribution. 1. Pick a category below. 2. Narrow to the action, such as a drip rather than a splash. 3. Each file shows its length before you download it. - Interface sounds https://sfxmint.com/category/ui Taps, alerts and menus. - Water sounds https://sfxmint.com/category/water Drips, pours and splashes. - Footsteps https://sfxmint.com/category/footsteps Steps on wood, gravel, concrete and more. - Sound sets https://sfxmint.com/sets Several named events in one download. Packs — ready-made lists All 18 packs https://sfxmint.com/sets Can't find the sound you need? Make it. Describe it in a sentence and hear 4 takes in seconds. Making and hearing is free every day. Open AI Studio https://sfxmint.com/studio Building your game with an AI assistant? Claude Code, Cursor and Codex pick sounds from the same library while they write your game, through MCP or REST — no key. Making sounds uses your account. Run it in your terminal. claude mcp add --transport http sfxmint https://sfxmint.com/mcp Add sounds to my platformer: jump, coin, hit. get sound set { "set": "platformer" } - jump Smooth 8-Bit Video Game Jump 01 https://sfxmint.com/sounds/retro-game-jump-01 0.23 s · CC0 - coin Double-Chime 8-Bit Coin Pickup 52 No Reverb https://sfxmint.com/sounds/retro-game-coin-52 1.06 s · CC0 - hit Cracking Punch Impact 67 https://sfxmint.com/sounds/impact-punch-67 0.1 s · CC0 With an API key it can also make what the library lacks: generate sound, generate ambience and generate music; change sound gives three versions of a take, free. Search like you'd brief a sound designer Questions Can I use these in a video, game or app I sell? Yes. All SFXMint sounds are offered under CC0 1.0: use them in YouTube videos, games on Steam or itch.io, apps and ads. No attribution or license fee is required. How many sounds can I download? Listening is free and unlimited. Downloads: 3 library downloads a day, with or without a free account; ZIP packs come with a purchase. Any purchase also unlocks unlimited library downloads and ZIP packs for 30 days from payment. How do I add a sound to my project? Preview it, download the WAV or MP3, and add the file to your project. You can also let Claude Code, Cursor or Codex fetch it through the API or MCP. What if my game needs a sound the library doesn't have? Describe it in AI Studio, with the moment it plays in your game, and pick from the takes it makes. Making sounds: free to make and hear 3 a day ; a free account downloads its first 3 free, for personal, non-commercial use; commercial use HD, CC0 : one credit a generation, or a plan. Can I ship these in a game on Steam? Yes. The sounds are CC0, so no licence or credit is needed. They are AI-generated, and Steam's Content Survey asks about AI-made content that ships with a game, sound included: describe SFXMint's sounds in its AI section. itch.io asks the same in its AI disclosure. What has been checked? Every file is checked one by one: its format, length, loudness and peak level are measured, and the length each page shows is the part you can hear. Shipping on Steam or itch.io? How to disclose AI sound effects → https://sfxmint.com/guides/steam-ai-disclosure-sound-effects