A Model Context Protocol (MCP) server that exposes 49 pay-per-use APIs for AI agents via x402. It aggregates AI-related services across AI, crypto, DeFi, blockchain, weather, search, and security, enabling lightweight access through a unified gateway.

🛠️ Key Features

MCP-based server enabling model-context-aware API access
49 pay-per-use APIs across AI, crypto, weather, search, security, and more
x402 integration for micropayments and rate-limited, usage-based access
Topics include ai-agents, api-marketplace, base-network, pay-per-use, usdc-on-base
Readme excerpt highlights Baidu AI access via gateway

🚀 Use Cases

Deploy AI agents that fetch real-time data (weather, search results)
Monetized API access for AI workflows via micropayments
Integrate multiple AI and crypto APIs behind a single gateway
Model-context driven routing for agent decision-making

⚡ Developer Benefits

Unified MCP server for multiple API domains
Clear pay-per-use pricing with x402 micropayments
Easy integration with Usdc-enabled base-network payments
Rich topics to discover compatible tools and gateways

⚠️ Limitations

Source describes 49 APIs and gateway features; specific endpoint details and authentication flows are not enumerated
Readme excerpt focuses on Baidu AI access with no exact MCP protocol specs provided
No explicit reliability or latency guarantees in available data

🫘 GoldBean - x402 Micropaid API Marketplace

Official MCP Registry npm

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

bash

curl http://104.225.233.23:9879/health
# {"status":"ok","service":"GoldBean","timestamp":"2026-05-15T12:00:00.000Z"}

curl http://104.225.233.23:9879/eth-price
# {"usd":"2255.93","change24h":"+0.31%","timestamp":"2026-05-15T12:00:00.000Z"}

3. Call a Paid Endpoint

bash

curl http://104.225.233.23:9879/paid/btc-price
# HTTP 402 Payment Required
# x402-challenge: {...}

To pay the 402 and get data, you need an x402-capable client:

Using AgentCash:

bash

npx agentcash@latest fetch http://104.225.233.23:9879/paid/btc-price

Using x402-proxy (CLI tool):

bash

npx x402-proxy http://104.225.233.23:9879/paid/btc-price

Using curl with manual payment (advanced):

bash

# Step 1: Request triggers 402
curl -s -D - http://104.225.233.23:9879/paid/btc-price

# Step 2: Parse x402-challenge header, sign with your wallet
# Step 3: Retry with x402-payment header
curl -H "x402-payment: <signed-payment>" http://104.225.233.23:9879/paid/btc-price

4. MCP Integration

Add to Claude Desktop / Cursor / Cline mcpServers config:

json

{
  "mcpServers": {
    "goldbean": {
      "url": "http://104.225.233.23:9879/mcp"
    }
  }
}

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

code

Client                          GoldBean Server
  │                                   │
  ├─ GET /paid/btc-price ─────────────┤
  │◄─ 402 Payment Required ───────────┤
  │   x402-challenge: {...}           │
  │                                   │
  ├─ Sign challenge with wallet ──────┤
  │   (off-chain, no gas fee)         │
  │                                   │
  ├─ GET /paid/btc-price ─────────────┤
  │   x402-payment: <signed>          │
  │◄─ 200 OK ─────────────────────────┤
  │   {"usd":"68000.00",...}          │
  │                                   │

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
Price: $0.02 USDC per paid call

Architecture

code

┌─────────────┐     x402 protocol      ┌──────────────┐
│   Client    │ ◄─────────────────────► │   VPS (USCA) │
│ (curl/Agent)│     HTTP + 402 flow     │  GoldBean 🫘 │
└─────────────┘                         │  :9879       │
       │                                └──────┬───────┘
       │         ┌──────────────┐              │
       └────────►│    Email     │◄─────────────┘
                 │  (Gmail)     │  Monitor alerts
                 │   Monitor    │
                 └──────────────┘

Development

bash

# Server
cd /opt/goldbean
npm install express axios @x402/express @x402/core @x402/evm
node server.js

# Monitor
python3 /opt/goldbean/chain_monitor.py

Ecosystem

Built on Bandwagon VPS (USCA-2). Part of the x402 ecosystem.

GoldBean MCP Server

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

Topics

🫘 GoldBean - x402 Micropaid API Marketplace

Quick Start

1. Prerequisites

2. Try a Free Endpoint

3. Call a Paid Endpoint

4. MCP Integration

Available Endpoints

Free (no payment needed)

Paid ($0.02 USDC per call)

How x402 Payment Works

Data Sources

Seller Info

Architecture

Development

Ecosystem

Install

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