GoldBean is a micropayment API marketplace based on the x402 protocol, also released as an MCP Server, officially described as "51 tools for global developers (derived from Baidu AI tools)." Its core feature is pay-per-use: no account registration, no API Key, and no monthly subscription; each call to a paid endpoint costs 0.02 USDC.
Purpose GoldBean is aimed at developers who need to call a variety of AI and data capabilities on demand through a unified interface. It packages capabilities such as cryptocurrency market data, web search, weather, image generation, LLM chat, code execution, translation, sentiment analysis, and QR code generation into separately payable endpoints for programs or MCP clients to call.
Main capabilities (endpoints explicitly listed in the material) Free endpoints (no payment required): the material only lists the heading "Free (no payment needed)" and does not list specific endpoint names. Paid endpoints ($0.02 USDC per call): the material likewise only gives the heading "Paid ($0.02 USDC per call)" and does not list the specific names of the 51 tools one by one, mentioning only in general terms that they cover cryptocurrency prices, web search, weather, image generation, LLM chat, code execution, translation, sentiment analysis, and QR codes. Regarding data sources, the third-party APIs mentioned in the material include: CoinGecko API (real-time cryptocurrency prices), Etherscan API (Gas price oracle), Alternative.me (Fear and Greed Index). A more specific list of endpoints is not yet provided.
How to use
- Prerequisites: hold USDC on the Base network (eip155:84532 testnet or eip155:8453 mainnet); you need a wallet that can sign x402 payments, such as AgentCash, CDP Wallet, or any EVM wallet.
- Calling paid endpoints: requires an x402-compatible client. The material gives three methods—use AgentCash; use x402-proxy (command-line tool); use curl to complete payment manually (advanced usage). The material does not give the specific code contents of these commands (the original text does not show them), so no specific commands are provided here.
- MCP integration: add GoldBean to the mcpServers configuration of Claude Desktop / Cursor / Cline to use it.The material does not show a specific configuration snippet.
x402 payment mechanism Settlement is handled by the facilitator (x402.org). Only when the challenge is accepted will the user's wallet send USDC, and there is no recurring charge. Specific parameters: seller wallet 0xB5f5CBe48E0595C044Bc626f278F757463eAc2Ce (Base); network eip155:84532 (Base Sepolia testnet), and it is stated that migration to eip155:8453 (Base mainnet) is underway; the facilitator is https://x402.org/facilitator；价格为每次已付费调用 0.02 USDC.
Online address and deployment GoldBean's online address is http://104.225.233.23:9879。项目构建在 Bandwagon VPS (USCA-2), and it is part of the x402 ecosystem. The project source code is in the GitHub repository https://github.com/wuzenghai616-lang/goldbean。
Applicable scenarios Suitable for developers who want to quickly access capabilities such as market data, search, weather, translation, image generation, and LLM chat at a very low cost per call, without registration or keys, as well as for users who want to directly call the above paid tools in an MCP client.
Limitations and information not yet provided
- The specific name, input and output parameters, and call examples of each of the 51 tools are not yet provided (the material only gives the two group headings, free/paid).
- The specific list of free endpoints is not yet provided.
- The specific way to enable Alipay / PayPal payment and its scope of application are not yet provided; the official text only says it supports pay-per-use via USDC, PayPal, or Alipay.
- The specific way to write the MCP configuration file and the specific commands for AgentCash and x402-proxy are not yet provided.
- The completion time of the mainnet migration and the differences between testnet and mainnet endpoints are not yet provided.
