Seller Toolbelt
Check product images, calculate marketplace fees, and look up barcodes for Amazon, eBay and Etsy sellers.
Validates product images against Amazon, eBay and Etsy requirements, calculates selling fees and profit margins, looks up product details from barcodes, and edits images (background removal, resizing, format conversion, watermarking).
Try asking Muse: "Check if my product photo meets Amazon's main image requirements before I upload it."
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Source: Found in the official MCP Registry (com.sellertoolbelt/mcp) · First listed October 29, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. 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.
https://sellertoolbelt.com/api/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
Seller Toolbelt is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://sellertoolbelt.com/api/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 1507ms. Worked in n/a of checks over 30 days.
Screening · October 29, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 11
check_listing_imageDeterministically checks whether a product photo meets the main-image requirements of Amazon, eBay or Etsy (pure white background, product fill, minimum resolution, file format, colour space, borders, aspect ratio, sharpness, stray text/watermarks). Measured from the actual pixelcalculate_marketplace_feesComputes selling fees, net profit, margin and ROI for one sale on Amazon, eBay or Etsy from the sale price, shipping and costs. Category sets the default fee rate: amazon: default (15%), electronics (8%), computers (7%), clothing (17%), home (15%), toys (15%), books (15%); ebay: lookup_barcodeFinds product details (title, brand, category, image, description) for a UPC, EAN or GTIN barcode, using open product catalogs (strong for UK/EU groceries, drinks and cosmetics). Free.generate_qr_codeGenerates a QR code image (PNG) or SVG markup for any text or URL, e.g. for packaging inserts, product labels or invoices. Free.make_compliant_main_imageRemoves the background, centres and scales the product on pure white, sizes and encodes it to the marketplace spec (Amazon, eBay or Etsy), then re-checks the result and returns the per-rule verdict as proof. Returns a free watermarked preview (≤700px) plus unlock_url: a human operemove_backgroundCuts the product out of its background and returns a transparent PNG. Returns a free watermarked preview (≤700px) plus unlock_url: a human opens it to download the full-resolution file for site credits. Then call get_result for the download link.change_background_colorRemoves the background and places the product on a solid colour: white, light_gray, gray, black, beige, studio_blue, soft_pink, or custom with hex. Returns a free watermarked preview (≤700px) plus unlock_url: a human opens it to download the full-resolution file for site credits.resize_for_marketplaceFits the image onto an exact canvas, padding with white: amazon (2000×2000), ebay (1600×1600), etsy (2000×2000), square (1080×1080), instagram_portrait (1080×1350), story (1080×1920), or custom width/height. Returns a free watermarked preview (≤700px) plus unlock_url: a human opeconvert_imageRe-encodes an image as jpeg, png, webp, avif at a chosen quality, to change format or shrink file size. JPEG flattens transparency to white. Returns a free watermarked preview (≤700px) plus unlock_url: a human opens it to download the full-resolution file for site credits. Then cadd_watermarkStamps text (e.g. "© Your Brand") on an image in a corner, the centre, or tiled diagonally. Returns a free watermarked preview (≤700px) plus unlock_url: a human opens it to download the full-resolution file for site credits. Then call get_result for the download link.get_resultChecks a job created by one of the image tools. Returns download_url once a human has unlocked it via unlock_url; otherwise the status, preview_url and unlock_url again. Results expire 24h after creation unless claimed.Link
https://sellertoolbelt.com/api/mcpQuestions about Seller Toolbelt in Muse
How do I connect Seller Toolbelt to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Seller Toolbelt to help me. It is a free service with an MCP server at https://sellertoolbelt.com/api/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.
Is Seller Toolbelt working right now?
At the last check (October 29, 2026, 13:51 UTC) the endpoint was working, answering in 1507ms. It is checked every 15 minutes.
Is Seller Toolbelt safe to connect to Muse?
It was screened on October 29, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Seller Toolbelt do in Muse?
It exposes 11 tools, including check_listing_image, calculate_marketplace_fees, lookup_barcode, generate_qr_code. For example, you could ask Muse: "Check if my product photo meets Amazon's main image requirements before I upload it."
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