SendCheck — EVM address verification (x402)
Pre-send EVM address checks: free pre-check, $0.01 check, $0.05 deep scan. x402: payment is auth.
Connect it
Settings → Connectors → Add custom connector
URL: https://api.pennyforge.org/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://api.pennyforge.org/mcp{
"mcpServers": {
"sendcheck": {
"url": "https://api.pennyforge.org/mcp"
}
}
}claude mcp add --transport http sendcheck https://api.pennyforge.org/mcp{
"servers": {
"sendcheck": {
"type": "http",
"url": "https://api.pennyforge.org/mcp"
}
}
}3 tools, verified live
validate_addressFREE pre-send check of an EVM address: EIP-55 checksum verification (catches typos, dropped characters, clipboard malware) + a note that a passing checksum is a spell-check, not payee verification. Run this before paying for check_address.
check_addressPaid pre-send verification of one EVM address on one chain ($0.01 USDC via x402, EIP-3009 on Base): checksum, wallet-vs-contract, outgoing activity, native/USDC/USDT balances, leveled verdict with reasons and next action. TWO-PHASE: call without x_payment first to get the exact payment challenge (payTo, amount, asset), sign the USDC transfer, then call again with x_payment = the resulting X-Paymen
deep_scanPaid deep scan: the full verification across ALL FIVE chains (Base, Ethereum, Arbitrum, Optimism, Polygon) incl. wrong-network detection and USDC/USDT token-mismatch flags ($0.05 USDC via x402, EIP-3009 on Base). TWO-PHASE like check_address: first call returns the payment challenge; second call with x_payment returns the report.
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