> Pay per request with USDC on Base. No signup, no API key, no monthly subscription. > Every call costs $0.02 USDC via the x402 protocol. **GoldBean is live:** http://104.225.233.23:9879 --- Quick Start 1. Prerequisites - **USDC on Base** (eip155:84532 testnet or eip155:8453 mainnet) - **A wallet** that can sign x402 payments (AgentCash, CDP Wallet, or any EVM wallet) 2. Try a Free Endpoint 3. Call a Paid Endpoint To pay the 402 and get data, you need an x402-capable client: **Using AgentCash:** **Using x402-proxy (CLI tool):** **Using curl with manual payment (advanced):** 4. MCP Integration Add to Claude Desktop / Cursor / Cline mcpServers config: --- Available Endpoints Free (no payment needed) | Endpoint | Description | |----------|-------------| | GET / | Service info & endpoint list | | GET /health | Health check | | GET /eth-price | Real-time ETH price (via CoinGecko) | | GET /gas | ETH gas price estimate | | GET /card | Service card / metadata | | GET /mcp | MCP protocol manifest | Paid ($0.02 USDC per call) | Endpoint | Description | |----------|-------------| | GET /paid/btc-price | Real-time BTC price (via CoinGecko) | | GET /paid/gas-forecast | Gas price forecast | | GET /paid/market-intel | Market sentiment & Fear & Greed Index | | GET /paid/defi-insights | DeFi TVL & chain data | | GET /paid/network-health | Blockchain network health | | GET /paid/tracker-report | MEV & on-chain tracker report | | GET /paid/sol-token-risk | Solana token risk assessment | --- How x402 Payment Works The facilitator (x402.org) handles settlement. Your wallet sends USDC only when challenge is accepted. No recurring charges. --- Data Sources - **CoinGecko API** — Real-time cryptocurrency prices - **Etherscan API** — Gas price oracle - **Alternative.me** — Fear & Greed Index --- Seller Info - **Seller wallet:** 0xB5f5CBe48E0595C044Bc626f278F757463eAc2Ce (Base) - **Network:** eip155:84532 (Base Sepolia testnet) → migrating to eip155:8453 (Base mainnet) - **Facilitator:** https://x402.org/facilitator