---
skill_id: gf-multivendor-fee-math-workbook
evaluation: free
quality: agent-decision-grade
functional: true
price_usd_full: 3.99
price_label: $3.99 / unlock
kind: good
category: Commerce
challenge: https://lvlltd.com/api/pay?skill=gf-multivendor-fee-math-workbook
outline: https://lvlltd.com/skills/gf-multivendor-fee-math-workbook/outline.json
runtime_after_unlock: src/index.js createSkill
standards: x402, ERC-7857
completion_pass: functional-v1
---

# Free sample — Multi-Vendor Fee Math Workbook

**Skill ID:** `gf-multivendor-fee-math-workbook`  
**Unlock:** $3.99 / unlock USDC on Base via x402  
**What you get after pay:** runnable sealed pack (`createSkill().run`) + workbook + templates  

## Summary

Transparent fee-split worksheets for marketplaces with platform, agent, and vendor cuts on USDC sales.

Worked examples and blank worksheets for gross price, platform fee, agent referral cut, vendor net, and buyer-visible total. Includes ordering rules so fee math stays consistent across listings and receipts.

## When to use

- Multiple vendors and agents share a sale and you need a single fee-order rule
- Buyer receipts must show platform and network fees without ambiguous nets
- You are pricing sealed goods where platform, agent, and vendor cuts all apply

## Decision-grade outline (free)

1. Fix fee application order (gross, platform %, agent cut, fixed fees, vendor net) and document it as a reusable rule card
2. Fill worked examples for single-vendor, multi-vendor cart, and agent-referred sealed unlock scenarios
3. Create blank worksheets with input cells for price, rates, and fixed fees so ops can recompute per order
4. Specify buyer-visible fee line labels that match receipt fields without promising net earnings
5. Add edge cases: zero agent cut, fee-cap, and minimum-platform-fee so edge totals stay defined

## Capabilities

- Canonical fee-application order rule card
- Worked multi-party USDC sale examples
- Blank recomputation worksheets per order
- Buyer-visible fee line label conventions

## Artifacts after unlock

- `fee-order-rule-card.md`
- `multivendor-fee-worked-examples.csv`
- `per-order-fee-worksheet.md`

## Detailed description

Multi-Vendor Fee Math Workbook is built for agent marketplaces and multi-seller catalogs where one checkout may involve platform fee, agent referral cut, vendor net, and optional fixed rails costs on Base USDC. Ambiguous fee order is a common source of support tickets; this pack locks a documented application order and walks through worked examples so finance and product share one mental model. Blank worksheets accept price and rate inputs so ops can recompute nets per order without inventing ad hoc spreadsheets. Buyer-visible labels align receipt lines with internal math so shoppers see platform and network fees clearly. Edge cases—zero referral, fee caps, minimum platform fees—are named so totals never go undefined. Free outline eval lets you compare the rule card to your current fee policy before buying. Delivery unlocks with x402 Base USDC. The workbook does not guarantee revenue, margins, or volume; it is arithmetic structure and labeling craft only, not financial, tax, or legal advice. Keep PII out of worksheets; use order and vendor IDs you already hold under your own data policy (SSI/PASS-friendly).

## Functional runtime (paid)

After verified payment the sealed pack includes:

| Path | Role |
|------|------|
| `src/index.js` | `createSkill`, `run`, `plan`, `checklist` |
| `src/runbook.js` | Outline-driven steps with done_when |
| `src/tools.js` | Tool schemas for agent registries |
| `WORKBOOK.md` | Human/operator procedure |
| `templates/` | Checklist + artifact shells |
| `schemas/output.schema.json` | Result contract |

### Agent snippet (after unlock)

```js
import { createSkill } from "./src/index.js";
const skill = createSkill({ tenantId: "ops", agentId: "buyer" });
const result = await skill.run({
  goal: "Execute Multi-Vendor Fee Math Workbook for my catalog",
  context: { skill_id: "gf-multivendor-fee-math-workbook" },
  dry_run: false,
});
// result.ok, result.steps, result.artifacts
```

## Pay path

1. Free: this sample + outline.json  
2. `GET https://lvlltd.com/api/pay?skill=gf-multivendor-fee-math-workbook` → HTTP 402  
3. Transfer `maxAmountRequired` USDC to `payTo` on Base  
4. `POST /api/pay` with `X-PAYMENT: {"txHash":"0x…","skill":"gf-multivendor-fee-math-workbook"}`  
5. Write `sealed_pack.files` to disk or use install-unlocked-pack.mjs  
6. Re-redeem anytime with the same verified txHash  

## Honesty

- No revenue, conversion, or uptime guarantees  
- Not legal, tax, medical, or investment advice  
- Crypto transfers are irreversible  
- Confirmed unlocks only for proof strips (/api/proof)  

*Public `/sealed/gf-multivendor-fee-math-workbook/` is teaser-only. Full `src/` is paywalled under locked sealed delivery.*