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Wallet Portfolio Tracker API

br0ski777/wallet-portfolio-x402

Pulls real-time crypto wallet data across Base and Ethereum chains, surfacing native balances, ERC-20 token holdings, and USD valuations through a straightforward MCP interface. Built on the x402 micropayment protocol, so queries cost fractions of a cent in USDC rather than running on API keys or subscription tiers. Reach for this when you're building agents that need portfolio snapshots, balance checks, or multi-chain asset tracking without maintaining your own node infrastructure. The SSE transport keeps connections open for streaming updates. Lightweight enough for quick wallet queries, specific enough that you're not wading through a general-purpose blockchain API to get basic portfolio data.

tools
2
transport
SSE
last updated
May 16, 2026
View on GitHub

Tools

2 tools

Public tool metadata for what this MCP can expose to an agent.

wallet_get_portfolioUse this when you need to check a crypto wallet's holdings across chains. Returns a full portfolio breakdown in JSON. 1. nativeBalance: ETH balance with USD value 2. tokens: array of ERC-20 tokens wi2 params

Use this when you need to check a crypto wallet's holdings across chains. Returns a full portfolio breakdown in JSON. 1. nativeBalance: ETH balance with USD value 2. tokens: array of ERC-20 tokens wi

Parameters* required
addressstring
Wallet address (0x...)
chainstring
Blockchain network (default: base)one of base · ethereum
wallet_get_balanceUse this when you need a quick check of a wallet's ETH and USDC balance only. Returns a lightweight JSON response -- cheaper than full portfolio. 1. ethBalance: native ETH balance with USD value 2. u2 params

Use this when you need a quick check of a wallet's ETH and USDC balance only. Returns a lightweight JSON response -- cheaper than full portfolio. 1. ethBalance: native ETH balance with USD value 2. u

Parameters* required
addressstring
Wallet address (0x...)
chainstring
Blockchain network (default: base)one of base · ethereum

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Readme

Wallet Portfolio Tracker API

MCP Server x402 License: MIT

Full crypto wallet holdings across chains -- ETH, ERC-20 tokens, USD values. Portfolio tracking for agents. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "wallet-portfolio": {
      "url": "https://wallet-portfolio.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://wallet-portfolio.api.klymax402.com/api/portfolio?address=0x0000000000000000000000000000000000dEaD"
# -> 402 Payment Required, with an x402 payment challenge in the response body

View the full README on GitHub

Details

Repository
github.com/br0ski777/wallet-portfolio-x402
Website
github.com/Br0ski777/wallet-portfolio-x402
Category
Finance & Commerce
Transport
SSE
Registry
MCP registry, active

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