Captcha MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 62 installs a week from npm. Last commit 9 Aug 2026.
Charge AI agents per-call without accounts. PoW solve = free tier, Lightning = paid tier.
Today is the operative word: we check Captcha 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 captcha-mcp -- npx -y @powforge/captcha-mcp
{
"mcpServers": {
"captcha-mcp": {
"args": [
"-y",
"@powforge/captcha-mcp"
],
"command": "npx"
}
}
}
[mcp_servers.captcha-mcp]
command = "npx"
args = ["-y", "@powforge/captcha-mcp"]
{
"mcpServers": {
"captcha-mcp": {
"args": [
"-y",
"@powforge/captcha-mcp"
],
"command": "npx"
}
}
}
{
"mcpServers": {
"captcha-mcp": {
"args": [
"-y",
"@powforge/captcha-mcp"
],
"command": "npx"
}
}
}
This one needs environment variables set before it will start:
CAPTCHA_URL (PowForge captcha backend URL. Defaults to public production endpoint when running via npx; override for self-hosted or local dev.).
The author declared them in the registry entry; get the values from the project itself.
x402 toolkit for AI agents: paid web, AI, and Base chain tools per call in USDC. Free tools too.
Trustless spending accounts for AI agents on Solana with on-chain enforced limits.
No-KYC web search for AI agents, paid per query in Lightning sats (L402). Holds no keys.
MCP server for Lightning Tools — pay-per-call AI tools via Bitcoin Lightning
Blockchain JSON-RPC on 23 EVM chains for AI agents - free tier, API key, or x402 pay-per-call.
Storage and file sharing for AI agents. No account, no API key: $0.01 USDC per call (x402, Base).
Paid cron for AI agents: we call your https URL on schedule, signed. No account, paid with x402.
Free agent tests (no account or payment); paid ping.
Answers built from our own checks of this server.