---
skill_id: skill-nft-metadata-composer
evaluation: free
price_usd_full: 2.99
challenge: https://lvlltd.com/api/pay?skill=skill-nft-metadata-composer
outline: https://lvlltd.com/skills/skill-nft-metadata-composer/outline.json
standards: x402, ERC-7857
---

# Free sample — SkillNFT Metadata Composer

**Skill ID:** `skill-nft-metadata-composer`  
**Full unlock:** $2.99 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=skill-nft-metadata-composer  
**Outline JSON:** https://lvlltd.com/skills/skill-nft-metadata-composer/outline.json

## Summary

Compose SkillNFT metadata, traits, and marketplace-ready JSON.

## When to use

- Publishing SkillNFTs for the hub/nft-catalog
- You need deterministic token ids and trait schemas
- Marketplace cards need generative art metadata
- Collections must group by category/series

## Decision criteria (buy vs skip)

- You need this when: Publishing SkillNFTs for the hub/nft-catalog
- You get capability: trait schema (skill_id, tier, protocols, price band)
- Budget fits: full unlock is $2.99 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. Define trait schema (skill_id, tier, protocols, price band)
2. Compose marketplace-ready metadata JSON with provenance hash
3. Map unlock rights vs collectible display rights
4. Validate rarity claims against real supply
5. Emit metadata.json + royalty split worksheet

## Capabilities (preview)

- trait schema (skill_id, tier, protocols, price band)
- Compose marketplace-ready metadata JSON with provenance hash
- unlock rights vs collectible display rights
- Validate rarity claims against real supply

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

## Sample excerpt

# SkillNFT Metadata Composer

Compose SkillNFT metadata, traits, and marketplace-ready JSON.

This pack replaces generic boilerplate with a concrete method for **SkillNFT Metadata Composer**. Free evaluation steps:

1. Define trait schema (skill_id, tier, protocols, price band)
2. Compose marketplace-ready metadata JSON with provenance hash
3. Map unlock rights vs collectible display rights
4. Validate rarity claims against real supply
5. Emit metadata.json + royalty split worksheet

When to use: Publishing SkillNFTs for the hub/nft-catalog; You need deterministic token ids and trait schemas; Marketplace cards need generative art metadata; Collections must group by category/series.

**Price:** $10.99 / pack USDC on Base via x402 unlock.

**Standards:** x402 payments · ERC-7857 sealed skill model · agent-swarm ready.

## Outline

1. Define trait schema (skill_id, tier, protocols, price band)
2. Compose marketplace-ready metadata JSON with provenance hash
3. Map unlock rights vs collectible display rights
4. Validate rarity claims against real supply
5. Emit metadata.json + royalty split worksheet