Btc Address MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 558 installs a week from npm. Last commit 28 Oct 2026.
Validate Bitcoin addresses offline with real base58check and bech32/bech32m checksums
Today is the operative word: we check Btc Address MCP every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add btc-address-mcp -- npx -y @mrfentmen/btc-address-mcp
{
"mcpServers": {
"btc-address-mcp": {
"command": "npx",
"args": [
"-y",
"@mrfentmen/btc-address-mcp"
]
}
}
}
[mcp_servers.btc-address-mcp]
command = "npx"
args = ["-y", "@mrfentmen/btc-address-mcp"]
{
"mcpServers": {
"btc-address-mcp": {
"command": "npx",
"args": [
"-y",
"@mrfentmen/btc-address-mcp"
]
}
}
}
{
"servers": {
"btc-address-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@mrfentmen/btc-address-mcp"
]
}
}
}
Encode and decode base58 and base58check offline, with version bytes and checksums
Validate IBANs offline with the official length table and mod-97 checksum, country by country
CRC-32, CRC-32C, CRC-16 variants and Adler-32 offline, with checksum check values verified, keyless.
Parse, validate and convert XML offline with a real parser: entities, CDATA, attributes
Validate IBANs, generate test IBANs with real bank codes, look up BICs and bank codes (IBANgen).
Validates Polish PESEL, NIP, and REGON checksums; PESEL also decodes birth date and sex.
Verify email addresses in real time and find business email addresses with live mailbox checks.
Validate email addresses for deliverability and manage email validation batches with Truelist.
Answers built from our own checks of this server.