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kapoost avatar

humanMCP Marketplace — federated listings across personal MCP servers

kapoost/humanmcp-marketplace
HTTPregistry active
Summary

This is a federated classifieds board that indexes listings across independent humanMCP servers. It exposes three MCP tools: search_marketplace for querying offers and trades, list_servers to see all registered instances, and get_server for details on a specific node. The marketplace crawls servers every six hours via their /.well-known/agent.json and /listings/feed.json endpoints, building a searchable SQLite index while keeping content on origin servers. You'd use this when your agent needs to search for goods, services, or trades posted by humans running their own humanMCP instances. Registration is open to any server exposing the humanMCP protocol. Think of it as a search layer over a network of personal storefronts.

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humanMCP Marketplace

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A federated listings board across personal humanMCP servers. No accounts. No algorithms. Just humans and their offers.

Live: https://marketplace.humanmcp.net MCP endpoint: POST https://marketplace.humanmcp.net/mcp

What it does

Every human can run their own humanMCP server — publishing listings, offers, and trades. The marketplace crawls these servers and builds a single searchable index of listings.

Think of it as a town square where every stall is independently owned. The marketplace doesn't host content — it indexes and links back to the origin.

Connect an agent

{
  "mcpServers": {
    "humanmcp-marketplace": {
      "type": "http",
      "url": "https://marketplace.humanmcp.net/mcp"
    }
  }
}

MCP Tools

ToolDescription
search_marketplaceSearch listings across all servers — offers, trades, services
list_serversAll registered humanMCP instances
get_serverServer detail

REST API

GET  /servers              → list all registered servers
GET  /servers/{domain}     → server detail
GET  /search?q={query}     → full-text search across all listings
GET  /search?q=bread&type=trade → filter by listing type
GET  /feed                 → recent listings feed (JSON)
POST /register             → register a humanMCP instance
POST /mcp                  → MCP JSON-RPC 2.0 endpoint

Agent discovery

GET  /.well-known/agent.json  → agent profile card
GET  /openapi.json            → OpenAPI 3.1 spec
GET  /healthz                 → status + server/listing counts

Web UI

GET  /                  → homepage — listings + servers
GET  /q?q={query}       → search results
GET  /s/{domain}        → server page

Keyboard shortcuts: / search, j/k navigate, Enter open, d theme, ? help.

Register your server

Any humanMCP instance can join. No account needed — just your domain:

curl -X POST https://marketplace.humanmcp.net/register \
  -H "Content-Type: application/json" \
  -d '{"domain": "yourname-humanmcp.fly.dev"}'

The marketplace will:

  1. Verify it's a real humanMCP (fetches /.well-known/agent.json)
  2. Index all listings from /listings/feed.json
  3. Add to crawl schedule (every 6 hours)

Requirements: your server must expose /.well-known/agent.json and /listings/feed.json.

How crawling works

Your humanMCP server
    ↓
Marketplace fetches /.well-known/agent.json (identity)
    ↓
Fetches /api/profile (author name, bio, tags)
    ↓
Fetches /listings/feed.json (listings)
    ↓
Indexes in SQLite + FTS5
    ↓
Searchable within minutes, re-crawled every 6 hours

Listings stay on your server. Marketplace keeps a search index only.

Configuration

SourceNameDefaultDescription
envPORT8080Listen port
envDB_PATH./marketplace.dbSQLite database path
envSEED_SERVER—Domain to crawl on startup
flag--addr:8080Listen address
flag--db./marketplace.dbDatabase path
flag--seed—Seed server domain
flag--crawl-interval6hRe-crawl interval

Stack

  • Go (stdlib + modernc.org/sqlite)
  • SQLite + FTS5 for full-text search
  • Fly.io single machine, 256MB
  • No JS framework — server-rendered HTML with keyboard navigation

Run locally

go build -o marketplace ./cmd/server/
./marketplace --seed kapoost.humanmcp.net
# open http://localhost:8080

Deploy

fly apps create humanmcp-marketplace
fly volumes create marketplace_data --size 1 --region ams
fly deploy

Key principles

  1. Listings only — marketplace indexes offers, trades, services
  2. No content hosting — index + link back, always
  3. Attribution — author server visible on every result
  4. Opt-in — register voluntarily
  5. Federated — anyone can run their own marketplace instance
  6. Open protocol — humanMCP REST API is the standard

Creative content (poems, essays, images) belongs on the author's server. A separate discovery service for that is planned.

License

MIT

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Categories
Search & Web Crawling
Registryactive
TransportHTTP
UpdatedMay 5, 2026
View on GitHub

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