Blog

Notes on agent-native commerce, x402, and what we're building.

Agents won't buy pizza first — they'll buy game keys

May 29, 2026 · 7 min read · CDK

Everyone pictures an AI agent ordering dinner or booking a flight. Those are the last things it'll buy unattended — with no human tapping confirm — not the first. The first market for fully autonomous agent commerce is digital goods, and game keys are the cleanest consumer example. Here's the framework.

Building a game-buying AI agent in 200 lines with x402 + MCP

May 29, 2026 · 6 min read · CDK

How to give an autonomous AI agent the ability to buy any of 40,000+ video game keys, gift cards, and subscriptions — paying onchain in USDC, no human in the loop. Code, flow, and the pitfalls we hit.

CDK — Digital Products for AI Agents

Agent-native REST API for buying digital products with USDC payments on Base chain. Browse 40,000+ game keys, gift cards, and more across Steam, PlayStation, Xbox, Nintendo, Amazon, iTunes, and more. Zero registration, instant delivery.

API Base URL

https://api.cdk.bot

Quick Start for AI Agents

If you are an AI agent or LLM, use the API directly — not this webpage. Here are the key endpoints:

Agent Discovery — GET /.well-known/agent.json — capabilities, auth, endpoints
OpenAPI Spec — GET /openapi.json — full API schema (OpenAPI 3.1)
API Documentation — GET /docs — interactive Swagger UI
Health Check — GET /health — API status

Public API Endpoints (no auth required)

GET /games — Browse/search products (params: q, platform, region, page, limit)
GET /games/{id} — Product details with price and stock
GET /platforms — List available platforms
GET /regions — List available regions
POST /purchase — Buy a product key (x402 USDC payment flow)
GET /orders/{id} — Check order status
GET /orders/{id}/receipt — Get purchase receipt
POST /refund — Submit refund claim

Payment Methods

USDC on Base chain — Direct onchain transfer, instant verification. x402 protocol.
Credit/Debit Card, PayPal, Apple Pay — Via Coinbase Onramp. No crypto wallet needed. 5-15 min delivery.

Purchase Flow (x402 Protocol)

GET /games?q=battlefield — find a product
POST /purchase {"game_id": "..."} — receive HTTP 402 with payment details (amount, USDC address, card_payment_url)
Send USDC on Base chain OR use card_payment_url for card/PayPal payment
POST /purchase {"game_id": "...", "tx_hash": "0x..."} — receive product key

Refund Policy

not_delivered — Payment confirmed but no key received. Refunded instantly and automatically.
key_invalid — Key does not activate. Verified via supplier within 24 hours.
key_already_redeemed — Key was already used. Verified via supplier within 24 hours.
wrong_product — Wrong platform, region, or edition. Verified via supplier within 24 hours.

Refund claims must be submitted within 7 days of purchase via POST /refund. Approved refunds paid in USDC to original wallet.

Example API Calls

# Search for products
curl https://api.cdk.bot/games?q=battlefield&platform=Steam

# Get game details
curl https://api.cdk.bot/games/{game_id}

# List platforms
curl https://api.cdk.bot/platforms

# Get OpenAPI spec
curl https://api.cdk.bot/openapi.json

Operator

Botsignals LLC · 1007 N Orange St. 4th Floor 2476, Wilmington, DE 19801, USA · info@cdk.bot

Payments: USDC on Base chain (instant) or credit card / PayPal / Apple Pay via Coinbase Onramp (5-15 min). No registration, no API keys for browsing. Built on Cloudflare Workers.