Kx402 runs on your own machine — the client starts it, so there is no endpoint to ping. 37 installs a week from npm. Last commit 22 Jul 2026.
Kaspa x402 agent payer — pay x402 v2 services on Kaspa (KAS) per call, no account or API key
Nothing serious here today
Today is the operative word: we check Kx402 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
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 kx402 -e 'KASPA_X402_KASPA_WASM_MODULE=<KASPA_X402_KASPA_WASM_MODULE>' -e 'KASPA_X402_FUNDING_WALLET=<KASPA_X402_FUNDING_WALLET>' -- npx -y kx402{
"mcpServers": {
"kx402": {
"command": "npx",
"args": [
"-y",
"kx402"
],
"env": {
"KASPA_X402_FUNDING_WALLET": "<KASPA_X402_FUNDING_WALLET>",
"KASPA_X402_KASPA_WASM_MODULE": "<KASPA_X402_KASPA_WASM_MODULE>"
}
}
}
}[mcp_servers.kx402]
command = "npx"
args = ["-y", "kx402"]
env = { KASPA_X402_KASPA_WASM_MODULE = "<KASPA_X402_KASPA_WASM_MODULE>", KASPA_X402_FUNDING_WALLET = "<KASPA_X402_FUNDING_WALLET>" }{
"mcpServers": {
"kx402": {
"command": "npx",
"args": [
"-y",
"kx402"
],
"env": {
"KASPA_X402_FUNDING_WALLET": "<KASPA_X402_FUNDING_WALLET>",
"KASPA_X402_KASPA_WASM_MODULE": "<KASPA_X402_KASPA_WASM_MODULE>"
}
}
}
}{
"servers": {
"kx402": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"kx402"
],
"env": {
"KASPA_X402_FUNDING_WALLET": "<KASPA_X402_FUNDING_WALLET>",
"KASPA_X402_KASPA_WASM_MODULE": "<KASPA_X402_KASPA_WASM_MODULE>"
}
}
}
}Put your own values in place of
<KASPA_X402_KASPA_WASM_MODULE> (Path to the rusty-kaspa v2.0.0 nodejs WASM SDK (kaspa.js). Get it with the repo's `npm run fetch-sdk`), <KASPA_X402_FUNDING_WALLET> (Funding key: wallet-key:<path> to a 0600 file holding a 64-hex private key, or a raw 64-hex key).
The author’s registry entry marks them as required.
Optional settings from the registry entry, left out of the block above:
KASPA_X402_NETWORK (kaspa:mainnet or kaspa:testnet-10 (default testnet-10)).
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Kx402 — questions
Answers built from our own checks of this server.