---
skill_id: agent-x402-first-buy
evaluation: free
price_usd_full: 0.05
challenge: https://lvlltd.com/api/pay?skill=agent-x402-first-buy
outline: https://lvlltd.com/skills/agent-x402-first-buy/outline.json
standards: x402, ERC-7857
---

# Free sample — Agent x402 First Buy

**Skill ID:** `agent-x402-first-buy`  
**Full unlock:** $0.05 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=agent-x402-first-buy  
**Outline JSON:** https://lvlltd.com/skills/agent-x402-first-buy/outline.json

## Summary

.05 start-here: prove your agent can complete HTTP 402 → Base USDC → sealed pack unlock on lvlltd.com.

## When to use

- First autonomous purchase on live x402 rails
- Wallet/facilitator integration canary at .05
- Training agents on challenge → unlock → install

## Decision criteria (buy vs skip)

- You need this when: First autonomous purchase on live x402 rails
- You get capability: Live x402 purchase canary
- Budget fits: full unlock is $0.05 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. Free eval outline
2. GET 402 challenge
3. Transfer USDC on Base
4. POST X-PAYMENT unlock
5. Install sealed_pack.files

## Capabilities (preview)

- Live x402 purchase canary
- Parse 402 challenge fields
- Idempotent redeem
- Upsell ladder to flagship

## 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/agent-x402-first-buy/outline.json
GET  https://lvlltd.com/api/pay?skill=agent-x402-first-buy   → HTTP 402
# transfer maxAmountRequired USDC to payTo on Base
POST https://lvlltd.com/api/pay
  X-PAYMENT: {"txHash":"0x…","skill":"agent-x402-first-buy"}
# response.sealed_pack.files = full pack
```

## Sample excerpt

# Agent x402 First Buy

**ID:** `agent-x402-first-buy`  
**Category:** Commerce  
**Price:** $0.05 USDC  
**Tags:** x402, starter, entry, micropay, base, agents, start-here  
**Tier:** starter  

## Summary

The $0.05 start-here skill: prove an autonomous agent can complete HTTP 402 → Base USDC → sealed pack unlock on lvlltd.com, then install and run the pack. Built for first agent purchases.

## When to use

- You need a near-zero-cost live proof that your agent wallet can buy on Base
- You want a deterministic first purchase before spending on larger packs
- You are integrating LvlAgentShop / raw x402 and need a training target
- You want a sealed runbook for challenge → pay → unlock → install

## Detailed description

**Agent x402 First Buy** is the recommended entry product for autonomous agents on lvlltd.com.

It solves a common cold-start pain: *“Can my agent actually complete a real x402 purchase and use the payload?”*

For five cents of USDC on Base you unlock:

1. Machine-readable purchase checklist (challenge fields, error codes, redeem)
2. Install script notes for `sealed_pack.files`
3. Copy-paste curl / SDK examples pointed at this skill
4. Links to free evaluation, proof heartbeat, and upsell ladder (premium token → Revenue OS)

This is **not** a fake sandbox. Payment is real USDC on Base to the live treasury. Re-redeem with the same `txHash` is idempotent.

## Outline

1. Free-eval this skill via outline.json (no pay)
2. GET 402 challenge from `/api/pay?skill=agent-x402-first-buy`
3. Transfer `maxAmountRequired` USDC to `payTo` on Base
4. POST X-PAYMENT with txHash → receive sealed_pack.files
5. Install files; run createSkill smoke; record proof via `/api/proof` ledger

## Capabilities

- End-to-end agent purchase rehearsal on live rails
- Parse top-level and accepts[] 402 challenge shapes
- Handle PROOF_REQUIRED / PAYMENT_VERIFICATION_FAILED errors
- Idempotent re-redeem and optional license.token path
- Ladder to tripwire ($0.99) and flagship ($49) packs

## Artifact outputs

- FIRST_BUY.md runbook
- challenge-field map (JSON)
- install-notes.md
- upsell ladder (start_here → tripwire → flagship)
- x402 receipt metadata after purchase

## Decision

…(remainder sealed after x402 unlock)…