# AuctionBotPro > Precision auction sniping for ShopGoodwill.com. Automated last-second bidding, price research, and shipping calculations. Pay-per-use via x402 (USDC on Base) or API key. ## API - [OpenAPI Spec](https://api.auctionbotpro.com/.well-known/openapi.json): Full machine-readable API specification - [AI Plugin Manifest](https://api.auctionbotpro.com/.well-known/ai-plugin.json): ChatGPT/LLM plugin configuration - [Full API Documentation](https://api.auctionbotpro.com/llms-full.txt): Complete API reference in a single file ## Capabilities - **Search**: Find items on ShopGoodwill by keyword, category, price range - **Item Details**: Get full listing info including images, current price, end time - **Shipping**: Calculate shipping costs to any US zip code - **Snipe**: Create automated last-second bids with configurable timing (3-120s before end) - **Quick Bid**: Place immediate bids without scheduling - **Price Research**: Research resale prices across eBay, Mercari, Poshmark, Amazon - **History**: View past bids and results ## Authentication - **x402 (recommended for agents)**: No account needed. Pay per API call with USDC on Base chain. Send request without auth → receive 402 with payment details → pay → retry with payment proof. - **API Key**: Set `X-API-Key` header. For automation and scripts. - **Bearer Token**: Session token for authenticated web users. ## Pricing (x402) - Search, item details, shipping, list/get snipes, history: $0.01/call - Price research: $0.25/call - Quick bid: $0.50/call - Create snipe: $1.00/call ## Links - [Website](https://auctionbotpro.com) - [Documentation](https://auctionbotpro.com/docs) - [Developer Guide](https://auctionbotpro.com/developers) - [Terms of Service](https://auctionbotpro.com/terms) - [Privacy Policy](https://auctionbotpro.com/privacy)