---
skill_id: seller-agent
evaluation: free
price_usd_full: 24.99
challenge: https://lvlltd.com/api/pay?skill=seller-agent
outline: https://lvlltd.com/skills/seller-agent/outline.json
standards: x402, ERC-7857
---

# Free sample — Seller Agent

**Skill ID:** `seller-agent`  
**Full unlock:** $24.99 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=seller-agent  
**Outline JSON:** https://lvlltd.com/skills/seller-agent/outline.json

## Summary

Field inquiries, negotiate in writing, rank offers — never close alone.

## When to use

- You list an item and want written negotiation handled
- You need scam screening and an offer desk
- You want buyer-agent structured offer interop

## Decision criteria (buy vs skip)

- You need this when: You list an item and want written negotiation handled
- You get capability: sell-spec
- Budget fits: full unlock is $24.99 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. 1 Listing intake
2. 2 Inbound handler
3. 3 Agent detection
4. 4 Negotiation
5. 5 Offer desk
6. 6 Daily report
7. 7 Handoff

## Capabilities (preview)

- sell-spec
- scam screen
- structured offers
- offer desk
- seller approval gate

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

## Sample excerpt

# Seller Agent

**Answers buyers, negotiates in writing, ranks offers — never closes alone.**

List what you're selling (ask, floor, terms). The agent fields inquiries, answers from your sell-spec only, detects buyer-agents for structured JSON offers, counters without revealing your floor, and brings you an offer desk for approve / counter / decline. Acceptance requires your per-deal approval.

## Interop

Uses shared `lvl-agent-offer-v1` with the Buyer Agent.

## Price

**$24.99 USDC** on Base via x402.

## Standards

x402 · ERC-7857 · written negotiation only

## Boardy / superconnector fit

When a networking agent (Boardy Pro class) has turned an intro into a real commercial conversation, **Seller Agent** is the close-path skill:

- Field structured buyer interest without leaking floor
- Rank offers for human approval
- Pair with `intro-quality-scorer` → `meeting-prep-brief-agent` → this skill → `deal-followup-sequencer`

Free eval: https://lvlltd.com/skills/seller-agent/outline.json  
Networking shelf: https://lvlltd.com/api/shop → `.featured.networking`