SendCheck — EVM address verification (x402) MCP Server

by pennyforge-api Your server? Claim it

answering

SendCheck — EVM address verification (x402) is answering right now. Last checked 13 min ago. It exposes 3 tools. Last commit 10 Sep 2026.

Pre-send EVM address checks: free pre-check, $0.01 check, $0.05 deep scan. x402: payment is auth.

Uptime history 37 hours of history

37 hours agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

204 ms

Response time

average over 24h

Stars

last commit 10 Sep 2026

Nothing serious here today

Today is the operative word: we check SendCheck — EVM address verification (x402) every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add sendcheck --transport http https://api.pennyforge.org/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "sendcheck": {
      "url": "https://api.pennyforge.org/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.sendcheck]
url = "https://api.pennyforge.org/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "sendcheck": {
      "url": "https://api.pennyforge.org/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "sendcheck": {
      "url": "https://api.pennyforge.org/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

address

check_address

Paid 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-Payment header to get the report. No account, no API key — the payment is the authentication.

deep

deep_scan

Paid 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.

validate

validate_address

FREE 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.

Endpoints

URL	Transport	State	Latency	Checked
https://api.pennyforge.org/mcp	streamable-http	answering	140 ms	13 min ago

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answering

SendCheck — EVM address verification (x402) — questions

Answers built from our own checks of this server.

What can SendCheck — EVM address verification (x402) do?

It exposes 3 tools, read directly from the server on our last check. Among them: check_address, deep_scan, validate_address. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is SendCheck — EVM address verification (x402) working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 204 ms. The bar chart above shows every period we have measured.

How do I connect SendCheck — EVM address verification (x402)?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does SendCheck — EVM address verification (x402) need an API key?

No. SendCheck — EVM address verification (x402) completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is SendCheck — EVM address verification (x402)?

It answers our handshake in 204 ms on average, which is faster than 66% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is SendCheck — EVM address verification (x402) open source?

Yes — it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.