Coal Coal gives AI agents a real checkout. Discover merchants through the decentralized 0G Storage catalog, pay autonomously in USDC on Base via x402 (Coinbase) or OKX APP (v2 envelope), and download purchased products — all without a human in the loop. Receipts are anchored on 0G Chain, allowing any third party to independently verify payments without trusting Coal itself. The MCP server is fully multi-tenant: every user supplies their own wallet key through the X-Coal-Agent-Key header, meaning the server never stores long-lived private keys or custody secrets. Agents are gasless by default — Coal covers operator gas costs. --- ## MCP Tools (13) ### Discovery & Marketplace * discover_merchants Browse the marketplace as a Markdown product grid * search_products Search and filter by product name, price, or tags * get_merchant_profile Retrieve merchant metadata and payout addresses * query_merchant_memory Natural-language merchant Q&A powered by TEE-backed 0G Compute --- ### Payments & Checkout * check_paywall Check whether an address has already paid * create_checkout Create a Coal checkout session (requires API key) * get_checkout_status Retrieve checkout session state and payment status * pay_merchant Send USDC on Base using ERC-3009 gasless transfers --- ### Verification & Delivery * verify_receipt Verify the complete proof trail: 1. Base transaction 2. 0G Storage receipt 3. 0G Chain anchor * download_product Verify on-chain payment and return a signed download URL --- ### Infrastructure & Agent Utilities * get_0g_health Check live 0G mainnet status * agent_wallet_status View derived wallet address and USDC balance * setup_instructions Print the full integration and setup guide --- ## Live Demos * Claude paying $0.10 for an ebook end-to-end https://agent.usecoal.xyz * x402 paywall demo https://oracle.usecoal.xyz/api/price/ETH --- ## Stack * Dual-protocol support: * Coinbase x402 * OKX APP * Base USDC settlement * 0G Storage receipts * 0G Chain receipt anchoring * 0G Compute Sealed Inference for policy execution * ERC-3009 gasless payment flow ---