Connskill Growth MCP Server

@connskill/mcp-growth-services

Pay-per-call market data and real-world actions for AI agents, served from agent.connskill.com: keyword volume by location, Google SERP snapshots (with AI-overview and PAA blocks), site audits with a real crawl, backlinks, competitors, SMS verification numbers, receive-only inboxes, LLM chat hosted in Germany, and a trust check for other x402 sellers.

No account, no API key. Paid calls use USDC on Base via x402. Free endpoints (quotes, catalogue, status, locations) need no wallet at all.

This repo ships the same capability in three forms, so any agent can buy:

Tools are generated from the service's current OpenAPI catalogue and x402 prices when the MCP process first reads its catalogue. The available tool set follows those documents; endpoints marked for exclusion and wallet-signature operations are kept out of this adapter. Restart the MCP process to load an updated catalogue.

Payment model

This source tree is the local 0.3.0 candidate. Publishing the npm package, registry metadata and Glama build is a separate release step.

• Free endpoints work with no wallet.
• Paid endpoints need X402_WALLET_KEY, the private key of a Base wallet holding USDC. The official x402 v2 packages sign an EIP-3009 authorization for the chosen request. The client permits Base mainnet, official USDC and the configured merchant only. It checks the complete resource URL and refuses redirects. Without a key, paid MCP tools return a clear hint instead of sending a purchase.
• X402_MAX_USD (default 1.00) is an exact USDC decimal with up to six fractional digits. Empty, negative, scientific and hexadecimal values are rejected. 0 disables payment. This is a per-call authorization limit, not a daily budget.
• Requests have a bounded duration and bounded JSON request/response sizes. A signed request is sent at most once. A timeout after dispatch is an unknown outcome, not proof that the merchant rejected payment.
• An accepted background job (202) is recorded as accepted, with its purchase and authenticated status URLs. It is not reported as a delivered result.
• Payment attempts are persisted before dispatch. Repeating the same canonical request does not create another payment by default. An intentional new purchase of an already delivered request requires MCP argument confirmNewPurchase: true or CLI flag --new-purchase. Neither option overrides an accepted or unclear purchase.
• Keep the private state directory and its parent together. The parent contains a bootstrap marker that detects a missing store. Damaged or incomplete state blocks payment; it is never silently reset. A completely lost parent and marker cannot be distinguished from first use by a new process. Do not delete them to retry a purchase. Separate clients or containers must share the same persistent state to share this guard.

MCP responses include payment state in _meta["io.connskill/payment"]; uncertain outcomes also contain the purchase reference and doNotPayAgain in the text result. No authorization signature or private key is saved in the attempt store. This client uses the purchase reference for support; it does not automatically replay a payment header or sign a replacement to recover a response.

⚠️ The key can spend real USDC. Use a dedicated wallet funded with only what the agent may spend. Never a main wallet.

Install

Requires Node.js 22 or newer. The lockfile includes runtime dependencies that require Node 22.

Claude Code

claude mcp add connskill-growth -s user -e X402_WALLET_KEY=0x... -e X402_MAX_USD=0.50 -- npx -y @connskill/mcp-growth-services

Or as a plugin with the skill included (asks for the key in its own config, stored in the keychain):

claude plugin marketplace add CONN-SKILL/connskill-growth-mcp
claude plugin install connskill-growth@connskill

Codex

codex mcp add connskill-growth --env X402_WALLET_KEY=0x... --env X402_MAX_USD=0.50 -- npx -y @connskill/mcp-growth-services

Skill only: copy the complete skills/connskill-growth folder to ~/.agents/skills/. Its scripts share local modules; copying only x402-call.mjs is insufficient.

Cursor / Claude Desktop (mcpServers)

{
  "mcpServers": {
    "connskill-growth": {
      "command": "npx",
      "args": ["-y", "@connskill/mcp-growth-services"],
      "env": { "X402_WALLET_KEY": "0x...", "X402_MAX_USD": "0.50" }
    }
  }
}

OpenClaw

openclaw mcp add connskill-growth --command npx --arg -y --arg @connskill/mcp-growth-services

Skill: copy skills/connskill-growth into ~/.agents/skills/ (or your workspace skills/) and set X402_WALLET_KEY under skills.entries.connskill-growth.env in openclaw.json.

Hermes (NousResearch hermes-agent)

hermes skills tap add CONN-SKILL/connskill-growth-mcp
hermes skills install connskill-growth

Or MCP in ~/.hermes/config.yaml under mcp_servers: with command: npx, args: [-y, @connskill/mcp-growth-services], env: {X402_WALLET_KEY: ...}.

From source

git clone https://github.com/CONN-SKILL/connskill-growth-mcp && cd connskill-growth-mcp && npm install
node index.mjs            # MCP over stdio
node test-smoke.mjs       # lists tools, calls a free endpoint, checks the paid guard (never spends)

Container from source

Build from this directory using the checked-in lockfile and pinned official Node image:

docker build --tag connskill-growth-mcp:local .
docker run --rm -i connskill-growth-mcp:local

The container runs as the unprivileged node user and communicates over STDIO. Keep stdin open (-i); no port is exposed. Free endpoints work without a wallet. For paid use, keep the parent directory in a named volume and supply the wallet through the runtime environment:

docker run --rm -i \
  --mount type=volume,src=connskill-growth-state,dst=/home/node/.local/state \
  --env X402_WALLET_KEY --env X402_MAX_USD=0.50 \
  connskill-growth-mcp:local

Reusing the same volume preserves attempts across container replacement. An ephemeral container filesystem cannot provide that guarantee. Supply settings at runtime only. The build context contains only the explicitly allowed package files; it excludes credentials and local dependencies.

The local container candidate is separate from a published Glama release. Glama requires a successful build test and publication through its existing maintainer interface.

The copied standalone skill needs only Node for unsigned calls. For paid calls, install the locked package dependencies from this source tree, or install @x402/fetch@2.17.0, @x402/core@2.17.0, @x402/evm@2.17.0 and viem in a parent package directory where Node can resolve them. SDK imports are lazy; no wallet or payment store is required for free discovery.

Environment

What it sells (excerpt)

Current amounts and tiers are listed in the x402 discovery document. The actual payment challenge binds the amount for the chosen request.

• POST /v1/keyword-ideas
• POST /v1/keyword-metrics (up to 1000 keywords)
• POST /v1/keyword-metrics-multi (up to 30 locations, one payment)
• POST /v1/serp-report (organic + AI overview, PAA, featured snippet)
• POST /v1/site-audit (Labs + backlinks + real on-page crawl)
• POST /v1/trust-check (vet an x402 seller: live 402, inflow, self-dealing)
• POST /sms/v1/sms-order (quote first, free)
• POST /mail/v1/mail-inbox (7-day receive-only inbox)
• POST /ai/v1/eu-chat (hosted in Germany, tool use)

Something missing? POST /v1/wishlist is free and read by humans.

License

MIT. Built by CONNSKILL GmbH & Co. KG, Traunstein, Germany.