Wallet Labels MCP x402 USDC on Base

Pay-per-call MCP for EVM wallet labels. Compose ENS, OFAC SDN, Tornado Cash mixer registry, on-chain ERC-20 metadata, and a curated public-label registry into one labeled view per address. Five chains: ethereum / base / arbitrum / optimism / polygon. No signup, no API key. Settle USDC on Base via x402.

Endpoints

Endpoint	What it does	Price
`POST /v1/wallet/labels`	ENS + OFAC + Tornado + ERC-20 + public-registry composed view	$0.05
`POST /v1/wallet/risk_score`	0–100 composite risk score + risk_band + itemized reasons	$0.10
`POST /v1/labels/by_category`	List all addresses in registries matching a category	$0.07

Sources composed

OFAC SDN — bundled list of well-known sanctioned crypto addresses (Lazarus, Tornado, Hydra, Garantex, Suex, Iran, Russia).
Tornado Cash registry — every deposit-pool address (ETH/DAI/USDC/USDT/WBTC/cDAI denominations) flagged as mixer.
ENS — reverse resolution on Ethereum L1 via viem.
On-chain ERC-20 metadata — name/symbol/decimals/totalSupply if the address is a token contract.
Public-label registry — exchanges (Binance/Coinbase/Crypto.com), DEXs (Uniswap V2/V3), lending (Aave V2/V3), stablecoins, founders, foundations, bridges, infrastructure.

Quickstart — curl

# 1. Hit endpoint without payment, receive 402 + envelope.
curl -s -X POST https://wallet-labels-mcp.mtree.workers.dev/v1/wallet/labels \
  -H 'content-type: application/json' \
  -d '{"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "chain": "ethereum"}'

# 2. Sign X-PAYMENT envelope per x402 spec, retry.
curl -s -X POST https://wallet-labels-mcp.mtree.workers.dev/v1/wallet/labels \
  -H 'content-type: application/json' \
  -H 'X-PAYMENT: ' \
  -d '{"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "chain": "ethereum"}'

Discovery surfaces

/.well-known/agent-card.json (A2A)
/.well-known/mcp.json (MCP server-card)
/.well-known/ai-plugin.json (OpenAI plugin)
/openapi.yaml (OpenAPI 3.1)
/mcp (MCP Streamable HTTP transport)

Repo + support

GitHub: sebastiancoombs/wallet-labels-mcp
Discord: #money-tree
Pay-to: 0x1664530DC2A1CA350B1dbaD1Fc1F1a70c90fe4de