CDK

Remote MCP server for buying video game keys, gift cards, and digital subscriptions through AI assistants. Payment in USDC on Base chain (x402 protocol) or credit card via Coinbase Onramp.

Endpoint: https://mcp.cdk.bot/mcp Transport: streamable-HTTP Auth: none for browsing; per-purchase x402 payment Status: production

This repository documents the CDK hosted remote MCP server. There is no installation — connect directly from any MCP-compatible client.

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Quick connect

Claude Desktop / Claude Code

Add to your MCP servers config:

{
  "mcpServers": {
    "cdk": {
      "url": "https://mcp.cdk.bot/mcp",
      "transport": "streamable-http"
    }
  }
}

Cursor

Add to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "cdk": {
      "url": "https://mcp.cdk.bot/mcp"
    }
  }
}

Cline / Windsurf / Continue / Zed

Use the "Add MCP server" flow with URL https://mcp.cdk.bot/mcp.

Programmatic (any MCP SDK)

import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js';

const client = new Client({ name: 'my-agent', version: '1.0.0' });
await client.connect(new StreamableHTTPClientTransport(new URL('https://mcp.cdk.bot/mcp')));
const tools = await client.listTools();

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Tools

Tool	Purpose
search_games	Search the catalog by title, platform, device, region, language, product type. Returns paginated results with live competitor prices.
get_game_details	Single product details with live marketplace price comparison (G2A / ENEBA / KINGUIN).
browse_filters	List available platforms, devices, regions, languages, product types.
get_price_quote	Lock a USD price for a product for 5 minutes. Returns quote_id + payment instructions (USDC address, optional card_payment_url).
confirm_purchase	Submit tx_hash + quote_id to verify onchain USDC payment and receive the product key.
check_order	Get order status, delivery state, and key code (requires wallet_address).
request_refund	Submit a refund claim. Reasons: not_delivered (auto-approved), key_invalid, key_already_redeemed, wrong_product.
submit_review	Submit a public review for a completed order.

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Payment

USDC on Base chain (direct, instant)

• Contract: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
• Verification: onchain ERC-20 Transfer log parsing via viem, 5 block confirmations
• Quote TTL: 5 minutes (price locked by quote_id)
• Double-spend protection: unique constraint on tx_hash

Card / PayPal / Apple Pay / ACH via Coinbase Onramp

• Provider: Coinbase Onramp (fiat → USDC on Base)
• Delivery: 5–15 minutes
• Coverage: 60+ countries
• One-time Coinbase KYC required (~2–3 min)

Sandbox (Base Sepolia testnet)

• Pass "chain": "base-sepolia" to get_price_quote and confirm_purchase
• Mock keys: SANDBOX-XXXXX-... (cannot be redeemed)
• Sepolia USDC: 0x036CbD53842c5426634e7929541eC2318f3dCF7e
• Faucets: Circle USDC, Alchemy ETH gas

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Refund policy

Reason	SLA	Mechanism
not_delivered	Instant	Auto-approved when payment is confirmed but no key was issued
key_invalid	24h	Verified via supplier
key_already_redeemed	24h	Verified via supplier
wrong_product	24h	Verified via supplier

30-day dispute window from purchase date. Approved refunds paid in USDC back to the original sending wallet. Refund transaction hash provided as onchain proof.

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Discovery

Endpoint	URL
MCP server card (SEP-1649)	https://mcp.cdk.bot/.well-known/mcp/server-card.json
Agent discovery manifest	https://api.cdk.bot/.well-known/agent.json
x402 capability descriptor	https://api.cdk.bot/.well-known/x402
OpenAPI 3.1 spec	https://api.cdk.bot/openapi.json
Interactive docs (Swagger)	https://api.cdk.bot/docs
Health & live stats	https://api.cdk.bot/health
llms.txt	https://cdk.bot/llms.txt

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Example: end-to-end purchase in Claude

> Buy Cyberpunk 2077 on Steam.

[Claude uses search_games → finds product]
[Claude uses get_price_quote → receives $24.99 quote_id]
[Claude shows you the card_payment_url and waits]

> [you click the link, pay $24.99 via card]

[Claude uses confirm_purchase with tx_hash from on-chain]
[Claude shows you the activation key]

Three MCP tool calls, one click for the user.

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Contact

• Website: https://cdk.bot
• Email: [email protected]
• Terms of service: https://cdk.bot/terms

Built on Cloudflare Workers. Backend supply via licensed wholesale distributors.

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License

Documentation released under MIT. The MCP server itself is a hosted commercial service — see terms.