---
skill_id: skill-marketplace-listing-optimizer
evaluation: free
price_usd_full: 7.99
challenge: https://lvlltd.com/api/pay?skill=skill-marketplace-listing-optimizer
outline: https://lvlltd.com/skills/skill-marketplace-listing-optimizer/outline.json
standards: x402, ERC-7857
---

# Free sample — Listing Optimizer

**Skill ID:** `skill-marketplace-listing-optimizer`  
**Full unlock:** $7.99 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=skill-marketplace-listing-optimizer  
**Outline JSON:** https://lvlltd.com/skills/skill-marketplace-listing-optimizer/outline.json

## Summary

Title, blurb, proof, CTA, and price display for lvlltd skill listings.

## When to use

- Listings get views but not unlocks
- Titles describe features instead of buyer outcomes
- You need A/B title variants or proof placement
- SEO-lite tags and categories are inconsistent

## Decision criteria (buy vs skip)

- You need this when: Listings get views but not unlocks
- You get capability: listing on title, proof, price clarity, sample depth
- Budget fits: full unlock is $7.99 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. Score listing on title, proof, price clarity, sample depth
2. Rewrite titles to problem/outcome first
3. Compose proof strips from real unlocks only
4. Lint CTAs for single next action
5. Emit listing scorecard + before/after rewrite

## Capabilities (preview)

- listing on title, proof, price clarity, sample depth
- Rewrite titles to problem/outcome first
- Compose proof strips from real unlocks only
- Lint CTAs for single next action

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

## Sample excerpt

# Listing Optimizer

Title, blurb, proof, CTA, and price display for lvlltd skill listings.

This pack replaces generic boilerplate with a concrete method for **Listing Optimizer**. Free evaluation steps:

1. Score listing on title, proof, price clarity, sample depth
2. Rewrite titles to problem/outcome first
3. Compose proof strips from real unlocks only
4. Lint CTAs for single next action
5. Emit listing scorecard + before/after rewrite

When to use: Listings get views but not unlocks; Titles describe features instead of buyer outcomes; You need A/B title variants or proof placement; SEO-lite tags and categories are inconsistent.

**Price:** $7.99 / pack USDC on Base via x402 unlock.

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

## Outline

1. Score listing on title, proof, price clarity, sample depth
2. Rewrite titles to problem/outcome first
3. Compose proof strips from real unlocks only
4. Lint CTAs for single next action
5. Emit listing scorecard + before/after rewrite