Toolbelt for AI agents

Connect

Add a remote MCP server (Streamable HTTP, no sign-in) with this URL:

https://sellertoolbelt.com/api/mcp

Claude Code:

claude mcp add --transport http sellertoolbelt https://sellertoolbelt.com/api/mcp

Full resolution with an API key

Create a key in your account and send it as Authorization: Bearer stb_…. Image tools then return the full-resolution file directly and spend your credits only when a job succeeds — no unlock link needed. Treat the key like a password; revoke it from your account any time.

Claude Code:

claude mcp add --transport http sellertoolbelt https://sellertoolbelt.com/api/mcp \
  --header "Authorization: Bearer stb_YOUR_KEY"

Cursor and other clients with an mcp.json:

{
  "mcpServers": {
    "sellertoolbelt": {
      "url": "https://sellertoolbelt.com/api/mcp",
      "headers": {
        "Authorization": "Bearer stb_YOUR_KEY"
      }
    }
  }
}

Claude.ai and ChatGPT custom connectors can't send custom headers yet — connect without a key there and use the unlock link.

Free tools

• check_listing_image

  Pass/warn/fail a product photo against Amazon, eBay or Etsy main-image rules, with a reason per rule.

• calculate_marketplace_fees

  Fees, profit, margin and ROI for one sale on Amazon, eBay or Etsy.

• lookup_barcode

  Product details from a UPC, EAN or GTIN.

• generate_qr_code

  A QR code as PNG or SVG for any text or URL.

Image tools (free preview)

Without a key, your assistant gets a watermarked preview for free, plus a link. Open the link to download the full-resolution file with the same credits you use on the site (kept for 24 hours). With an API key, the assistant gets the full-resolution file straight away.

• make_compliant_main_image

  Photo → compliant marketplace main image, re-checked with the rule verdict as proof.

• remove_background

  Transparent PNG cutout.

• change_background_color

  Product on a solid colour.

• resize_for_marketplace

  Exact canvas sizes for marketplaces and social.

• convert_image

  JPEG, PNG, WebP or AVIF at a chosen quality.

• add_watermark

  Text watermark in a corner, centre or tiled.

• get_result

  Status and download link for an image job.