# Marketplace Seller Fee Calculator Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## Marketplace Seller Fee Calculator

Compare seller fees and profit across 12 US marketplaces before you list an item

- Record: https://musedirectory.ai/connector/marketplace-seller-fee-calculator
- Category: Shopping & Commerce
- Developer: DavidMena (https://rapidapi.com/DavidMena/api/marketplace-seller-fee-calculator1)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 143ms, checked 2026-11-14T14:16:01Z
- Endpoint: https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-11-14T01:06:19Z)
- Source: Found in the official MCP Registry (io.github.davidemena-spec/marketplace-fees) https://registry.modelcontextprotocol.io/v0/servers?search=io.github.davidemena-spec%2Fmarketplace-fees

Connects to published fee schedules for 12 US marketplaces including Amazon, Walmart, eBay and Etsy. Muse can itemize fees, net payout and profit for one item, compare marketplaces at the same price, find the price that meets a profit goal, and check item eligibility and payout timing.

Example request: "Where should I sell this jacket, and what would I actually keep after fees on eBay versus Poshmark?"

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Marketplace Seller Fee Calculator to help me. It is a free service with an MCP server at https://marketplace-fee-calculator-api.huggyworks.workers.dev/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- list_marketplaces: List the supported US marketplaces with their valid categories, options, whether package dimensions are needed, the official fee pages used as sources and the date each was verified. Call this first to find valid category and option values.
- calculate_fees: Calculate the seller fees, net payout, profit, margin and ROI for selling one item at a given price on one US marketplace, itemized fee by fee from the marketplace's official fee schedule. For Amazon FBA and Walmart WFS, include package dimensions to add fulfillment fees.
- compare_marketplaces: Rank every supported US marketplace (or a chosen subset) by the profit the seller keeps when selling one item at the same price. Returns the best marketplace, each marketplace's fees, payout and margin, and any marketplaces skipped or rejected with the reason.
- find_target_price: Find the lowest list price on each US marketplace that reaches a goal: a profit in USD, a profit margin percent, or an ROI percent. Results are sorted from cheapest required price; marketplaces where the goal can't be reached are listed with the reason.
- advise_marketplaces: Answer "where should I sell this?" for one item. For each US marketplace: whether it accepts the item under its published policies (prohibited and restricted items, condition rules, approval-only categories), the fees and profit at the expected price, the lowest price that meets 

Screening checks:
- MCP handshake: pass (Answered in 436ms)
- Domain against threat feeds (Cloudflare security DNS): pass (marketplace-fee-calculator-api.huggyworks.workers.dev, rapidapi.com not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: pass (5 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)