TrySellr MCP Server

AI-powered selling intelligence for Facebook Marketplace, eBay, Mercari, OfferUp, and Craigslist.

TrySellr plugs into any MCP-compatible AI assistant (Claude, ChatGPT, Cursor, etc.) and gives sellers superpowers: instant item analysis, conversion-optimized listings, cross-platform pricing data, negotiation coaching, demand intelligence, and batch processing.

One server. Every AI assistant. Every marketplace.

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Tools

Tool	What It Does	Tier
analyze_item	Identify items, estimate value, detect brand/model	Free (3/day)
optimize_listing	Generate high-converting listings with SEO	Free (3/day)
price_check	Cross-platform pricing with sell-speed estimates	Pro
negotiate_assist	AI negotiation coach with copy-paste replies	Pro
demand_radar	Trending items and demand signals by location	Pro
performance_track	Listing health score and optimization plan	Pro
batch_list	Process 2-25 items at once	Power
cross_list	Generate listings for 2-6 platforms simultaneously	Power

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Pricing

• Free: 3 analyze + 3 optimize calls/day. No credit card.
• Pro ($19/mo): All analysis, pricing, negotiation, and tracking tools.
• Power Seller ($49/mo): Everything + batch processing + cross-listing.

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Quick Start

1. Get Your API Key

curl -X POST https://trysellr.com/api/signup \
  -H "Content-Type: application/json" \
  -d '{"email": "you@example.com"}'

2. Connect to Claude Desktop

Add to your Claude Desktop MCP config (claude_desktop_config.json):

{
  "mcpServers": {
    "trysellr": {
      "url": "https://trysellr.com/mcp",
      "headers": {
        "x-trysellr-key": "tsk_your_api_key_here"
      }
    }
  }
}

3. Start Selling Smarter

Open Claude and say:

• "Analyze this item: Sony WH-1000XM4 headphones, used, good condition, comes with case"
• "Write a Facebook Marketplace listing for a mid-century modern coffee table, walnut, 48x24, great condition"
• "What's trending in Electronics in Nashville right now?"

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API Endpoint

Base URL: https://trysellr.com/mcp

Transport: Streamable HTTP (MCP spec 2025-03-26)

Auth: Header x-trysellr-key: tsk_your_key

MCP Protocol

# Initialize
curl -X POST https://trysellr.com/mcp \
  -H "Content-Type: application/json" \
  -H "x-trysellr-key: tsk_your_key" \
  -d '{"jsonrpc":"2.0","method":"initialize","params":{},"id":1}'

# List tools
curl -X POST https://trysellr.com/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"tools/list","params":{},"id":2}'

# Call a tool
curl -X POST https://trysellr.com/mcp \
  -H "Content-Type: application/json" \
  -H "x-trysellr-key: tsk_your_key" \
  -d '{
    "jsonrpc":"2.0",
    "method":"tools/call",
    "params":{
      "name":"analyze_item",
      "arguments":{"description":"iPhone 14 Pro Max 256GB space black, good condition, no cracks"}
    },
    "id":3
  }'

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Development

# Install
npm install

# Run locally
cp .env.example .env  # Edit with your keys
npm run dev

# Build
npm run build

# Test
npm test

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Deploy

Railway (Recommended)

railway login
railway init
railway up

Docker

docker build -t trysellr-mcp .
docker run -p 8080:8080 --env-file .env trysellr-mcp

Fly.io

fly launch
fly deploy

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Architecture

┌─────────────────────────────────────────────┐
│            AI Assistants (Clients)           │
│  Claude │ ChatGPT │ Cursor │ Any MCP Client  │
└────────────────┬────────────────────────────┘
                 │ MCP Protocol (JSON-RPC 2.0)
                 │ POST /mcp
┌────────────────▼────────────────────────────┐
│         TrySellr MCP Server                  │
│  ┌──────────┐ ┌──────────┐ ┌──────────┐    │
│  │   Auth   │ │  Rate    │ │  Usage   │    │
│  │  Layer   │ │ Limiter  │ │ Tracker  │    │
│  └────┬─────┘ └────┬─────┘ └────┬─────┘    │
│       └─────────┬───┘────────────┘          │
│  ┌──────────────▼──────────────────────┐    │
│  │         Tool Registry (8 tools)      │    │
│  │  analyze │ optimize │ price │ batch  │    │
│  │  negotiate │ demand │ cross │ track  │    │
│  └──────────────┬──────────────────────┘    │
│  ┌──────────────▼──────────────────────┐    │
│  │         Service Layer                │    │
│  │  AI Engine │ Pricing │ Database      │    │
│  └─────────────────────────────────────┘    │
└─────────────────────────────────────────────┘

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License

MIT — Built by BOEZAC / TrySellr

https://trysellr.com