134 paid APIs as MCP tools, billed per call in USDC on Base. No account, no login.
Connect Runs on your machine
claude mcp add halowerk-mcp -e HALOWERK_PRIVATE_KEY=<HALOWERK_PRIVATE_KEY> -e HALOWERK_MAX_PREIS_USDC=<HALOWERK_MAX_PREIS_USDC> -e HALOWERK_BUDGET_USDC=<HALOWERK_BUDGET_USDC> -e HALOWERK_MODUS=<HALOWERK_MODUS> -e HALOWERK_TROCKEN=<HALOWERK_TROCKEN> -- npx -y [email protected]{
"mcpServers": {
"halowerk-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"HALOWERK_PRIVATE_KEY": "<HALOWERK_PRIVATE_KEY>",
"HALOWERK_MAX_PREIS_USDC": "<HALOWERK_MAX_PREIS_USDC>",
"HALOWERK_BUDGET_USDC": "<HALOWERK_BUDGET_USDC>",
"HALOWERK_MODUS": "<HALOWERK_MODUS>",
"HALOWERK_TROCKEN": "<HALOWERK_TROCKEN>"
}
}
}
}{
"mcpServers": {
"halowerk-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"HALOWERK_PRIVATE_KEY": "<HALOWERK_PRIVATE_KEY>",
"HALOWERK_MAX_PREIS_USDC": "<HALOWERK_MAX_PREIS_USDC>",
"HALOWERK_BUDGET_USDC": "<HALOWERK_BUDGET_USDC>",
"HALOWERK_MODUS": "<HALOWERK_MODUS>",
"HALOWERK_TROCKEN": "<HALOWERK_TROCKEN>"
}
}
}
}{
"servers": {
"halowerk-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"HALOWERK_PRIVATE_KEY": "<HALOWERK_PRIVATE_KEY>",
"HALOWERK_MAX_PREIS_USDC": "<HALOWERK_MAX_PREIS_USDC>",
"HALOWERK_BUDGET_USDC": "<HALOWERK_BUDGET_USDC>",
"HALOWERK_MODUS": "<HALOWERK_MODUS>",
"HALOWERK_TROCKEN": "<HALOWERK_TROCKEN>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
HALOWERK_PRIVATE_KEYOptional, secret | Private key of the paying wallet, hex with or without 0x. Use a throwaway wallet holding only a few dollars of USDC on Base. Without it, only the free catalogue and price tools work. |
HALOWERK_MAX_PREIS_USDCOptional | Ceiling per call in USDC. A more expensive service is refused, not bought. Default 0.05. |
HALOWERK_BUDGET_USDCOptional | Ceiling per session in USDC. Once reached the server refuses further paid calls. Default 1.00. |
HALOWERK_MODUSOptional | hero (12 curated services, default), gateway (3 meta-tools, smallest context) or all (70 services). |
HALOWERK_TROCKENOptional | Set to 1 for a dry run: returns price and call plan, pays nothing. |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 12 Aug 2026 |
| Last updated | 12 Aug 2026 |
| Registry name | io.github.halowerk/halowerk-mcp |
More other servers See all
Listing data from the official MCP registry. Status and tools from NestDaddy's daily check. Browse all MCP servers.