# Minecraft Mod Compatibility API (Modrinth / Lodestone)

> Minecraft Mod Compatibility API (Modrinth / Lodestone) is a paid API for AI agents from mcapi.jackiscool.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).

Returns the latest Minecraft, NeoForge, and Fabric loader version strings for compatibility checks in modpack tools and agents.

## Facts

- Endpoint: GET https://mcapi.jackiscool.com/versions?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/minecraft-mod-compatibility-api-modrinth-lodestone-1a760214
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_w6qyFIihModu-KuCqv6qe

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 minecraft-mod-compatibility-api-modrinth-lodestone-1a760214
```

Example prompt: What's the latest stable Minecraft release version, and what are the current NeoForge and Fabric loader versions I should be targeting for my modpack?

## When to prefer this

Choose this endpoint when an agent or modpack automation tool needs current Minecraft ecosystem version metadata (release, snapshot, NeoForge, Fabric) in a single low-cost call without requiring signup. It is purpose-built for modpack tooling and mod compatibility workflows, paying per call via x402 with no account needed.

## Known failure modes

- Payment not provided or insufficient funds via x402 — returns 402 Payment Required
- Upstream Modrinth API unavailable — may return stale or error response
- Network timeout on the mcapi.jackiscool.com host — no data returned
- Malformed query parameters — may return 400 Bad Request

## 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 containing four version strings: latest_release (current stable Minecraft), latest_snapshot (current Minecraft snapshot), neoforge_latest (current NeoForge build), and fabric_loader_latest (current Fabric loader version).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "latest_release": "26.3",
  "latest_snapshot": "26.4-snapshot-5",
  "neoforge_latest": "26.3.0.97",
  "fabric_loader_latest": "0.20.1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/minecraft-mod-compatibility-api-modrinth-lodestone-1a760214/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)