Base58 MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 599 installs a week from npm. Last commit 28 Oct 2026.
Encode and decode base58 and base58check offline, with version bytes and checksums
Today is the operative word: we check Base58 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 base58-mcp -- npx -y @mrfentmen/base58-mcp
{
"mcpServers": {
"base58-mcp": {
"command": "npx",
"args": [
"-y",
"@mrfentmen/base58-mcp"
]
}
}
}
[mcp_servers.base58-mcp]
command = "npx"
args = ["-y", "@mrfentmen/base58-mcp"]
{
"mcpServers": {
"base58-mcp": {
"command": "npx",
"args": [
"-y",
"@mrfentmen/base58-mcp"
]
}
}
}
{
"servers": {
"base58-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@mrfentmen/base58-mcp"
]
}
}
}
Validate Bitcoin addresses offline with real base58check and bech32/bech32m checksums
Execution-verified code generation and verification with signed, offline-checkable certificates.
URL and encoding work offline: parse a URL, percent-encode or decode text, and convert base64 both
CRC-32, CRC-32C, CRC-16 variants and Adler-32 offline, with checksum check values verified, keyless.
base64, hashing, regex, word count, JWT decode and CSS unit conversion. Deterministic, offline.
Decode PEM certificates, check expiry and inspect a live TLS certificate, all offline
Verify USDC payments and balances on Base mainnet: check_payment, get_balance, decode_tx.
Validate IBANs offline with the official length table and mod-97 checksum, country by country
Answers built from our own checks of this server.