---
skill_id: studio-master-expert
evaluation: free
price_usd_full: 11.99
challenge: https://lvlltd.com/api/pay?skill=studio-master-expert
outline: https://lvlltd.com/skills/studio-master-expert/outline.json
standards: x402, ERC-7857
---

# Free sample — Mastering Expert

**Skill ID:** `studio-master-expert`  
**Full unlock:** $11.99 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=studio-master-expert  
**Outline JSON:** https://lvlltd.com/skills/studio-master-expert/outline.json

## Summary

Expert agent pack for the Mastering engineer chair — Delivery masters, LUFS/TP limits, platform checklists.

## When to use

- You need a reusable Mastering engineer agent
- Running LVL Studio step master offline after unlock
- Building a multi-agent studio crew

## Decision criteria (buy vs skip)

- You need this when: You need a reusable Mastering engineer agent
- You get capability: Mastering engineer procedures
- Budget fits: full unlock is $11.99 USDC on Base
- You can automate unlock via HTTP 402 without a browser
- You only need teaser/outline first — sealed src/ops stay locked until payment

## Outline (preview)

1. Read free outline / sample
2. Buy expert pack via x402
3. Install sealed pack
4. Feed project brief or call /api/studio
5. Hand off to next pipeline step

## Capabilities (preview)

- Mastering engineer procedures
- Generate master_delivery.md
- Studio OS integration

## What you get after payment

- SKILL.md (teaser public)
- agent-install.json (public meta)
- src/index.js (stub public; full after unlock)
- Full sealed: src/, schemas/, ops/* (when present) after verified X-PAYMENT

## Agent buy path (zero human UI)

```
GET  https://lvlltd.com/skills/studio-master-expert/outline.json
GET  https://lvlltd.com/api/pay?skill=studio-master-expert   → HTTP 402
# transfer maxAmountRequired USDC to payTo on Base
POST https://lvlltd.com/api/pay
  X-PAYMENT: {"txHash":"0x…","skill":"studio-master-expert"}
# response.sealed_pack.files = full pack
```

## Sample excerpt

# Mastering Expert

**Price:** $11.99 USDC  
**Category:** Other  
**Version:** 1.0.0  
**Protocols:** x402, ERC-7857  
**Tags:** studio, x402, music, agent, studio-expert, master, skill-pack, music-production  

## Summary

Expert agent pack for the Mastering engineer chair — Delivery masters, LUFS/TP limits, platform checklists.

## Description

Purchasable skill pack that turns an agent into a Mastering engineer for LVL Studio OS step `master`. Includes runbook, install entry, and Studio API hooks. Pair with one-shot services or run repeatedly after unlock.

## When to use

- You need a reusable Mastering engineer agent
- Running LVL Studio step master offline after unlock
- Building a multi-agent studio crew

## After purchase (lvlltd.com)

1. Pay USDC on Base via x402 to the treasury
2. POST `/api/pay` with `X-PAYMENT: {"txHash","skill":"studio-master-expert"}`
3. Receive `sealed_pack.files` (code + docs)
4. Install: `node scripts/install-unlocked-pack.mjs unlock.json ./skills`
5. `import { createSkill } from './skills/studio-master-expert/src/index.js'`

## Standards

- x402 micropayments (Base USDC / USDbC)
- ERC-7857 sealed iNFT ownership record (marketplace unlock ≠ runtime design)
- Operational packages ship as sealed pack files after verified payment

## Safety

- No secrets, private keys, or exploit content
- Human escalate on high blast-radius actions
- Not legal, tax, medical, or financial advice