# Lodestone Minecraft Mod Compatibility API

> Lodestone Minecraft Mod Compatibility API is a paid API for AI agents from mcapi.jackiscool.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).

Checks whether a set of Modrinth mods are mutually compatible for a given mod loader and Minecraft game version, returning per-mod download URLs, required dependencies, and the newest shared game version.

## Facts

- Endpoint: GET https://mcapi.jackiscool.com/compat?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lodestone-minecraft-mod-compatibility-api-59400f4f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MaBeqwZnmCz64MiY2H_fG

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability lodestone-minecraft-mod-compatibility-api-59400f4f
```

Example prompt: Can you check if sodium, lithium, iris, and fabric-api are all compatible with each other on Fabric for Minecraft 1.21.1, and tell me the newest game version they all share along with any missing required dependencies?

## When to prefer this

Use this endpoint when you need to validate a specific list of Modrinth mods for cross-compatibility on a given loader and Minecraft version, especially when you also need download URLs and dependency resolution in a single call. Prefer this over manually querying Modrinth's API when you want the newest shared game version computed automatically across multiple mods.

## Known failure modes

- Invalid or unknown Modrinth slug returns an error or excludes that mod from results
- More than 25 mods specified may be rejected
- No compatible version found for the requested loader/game version combination results in all_compatible: false
- Network or Modrinth API downtime causes request failure
- Unsupported loader value returns a validation error

## How this service works

Modrinth mod compatibility checks for agents and modpack tools. 0.01 USDC per call via x402, no signup.

## Output

A JSON object indicating whether all mods are mutually compatible (all_compatible boolean), the newest Minecraft game version all mods share (newest_shared_game_version string), a list of any missing required dependencies, and per-mod details including compatible version and download URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "mods"
     ],
     "properties": {
      "mods": {
       "type": "string",
       "description": "Comma-separated Modrinth project slugs or ids (max 25), e.g. sodium,lithium,iris"
      },
      "loader": {
       "enum": [
        "fabric",
        "forge",
        "neoforge",
        "quilt"
       ],
       "type": "string",
       "default": "fabric",
       "description": "Mod loader"
      },
      "version": {
       "type": "string",
       "description": "Minecraft game version, e.g. 1.21.1"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "mods": {
       "type": "array",
       "items": {
        "type": "object"
       }
      },
      "all_compatible": {
       "type": "boolean"
      },
      "newest_shared_game_version": {
       "type": "string"
      },
      "missing_required_dependencies": {
       "type": "array",
       "items": {
        "type": "string"
       }
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "all_compatible": true,
  "newest_shared_game_version": "1.21.1",
  "missing_required_dependencies": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lodestone-minecraft-mod-compatibility-api-59400f4f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcapi.jackiscool.com](https://www.zero.xyz/host/mcapi.jackiscool.com/llms.txt)