Is this transaction safe to sign? Decodes what it really does and answers allow, warn or block.
Connect Runs on your machine
claude mcp add arbiter -e ARBITER_URL=<ARBITER_URL> -e ARBITER_PRIVATE_KEY=<ARBITER_PRIVATE_KEY> -e ARBITER_MAX_SPEND_USD=<ARBITER_MAX_SPEND_USD> -e ARBITER_MAX_PRICE_PER_CALL=<ARBITER_MAX_PRICE_PER_CALL> -- npx -y @arbiterlabs/[email protected]{
"mcpServers": {
"arbiter": {
"command": "npx",
"args": [
"-y",
"@arbiterlabs/[email protected]"
],
"env": {
"ARBITER_URL": "<ARBITER_URL>",
"ARBITER_PRIVATE_KEY": "<ARBITER_PRIVATE_KEY>",
"ARBITER_MAX_SPEND_USD": "<ARBITER_MAX_SPEND_USD>",
"ARBITER_MAX_PRICE_PER_CALL": "<ARBITER_MAX_PRICE_PER_CALL>"
}
}
}
}{
"mcpServers": {
"arbiter": {
"command": "npx",
"args": [
"-y",
"@arbiterlabs/[email protected]"
],
"env": {
"ARBITER_URL": "<ARBITER_URL>",
"ARBITER_PRIVATE_KEY": "<ARBITER_PRIVATE_KEY>",
"ARBITER_MAX_SPEND_USD": "<ARBITER_MAX_SPEND_USD>",
"ARBITER_MAX_PRICE_PER_CALL": "<ARBITER_MAX_PRICE_PER_CALL>"
}
}
}
}{
"servers": {
"arbiter": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@arbiterlabs/[email protected]"
],
"env": {
"ARBITER_URL": "<ARBITER_URL>",
"ARBITER_PRIVATE_KEY": "<ARBITER_PRIVATE_KEY>",
"ARBITER_MAX_SPEND_USD": "<ARBITER_MAX_SPEND_USD>",
"ARBITER_MAX_PRICE_PER_CALL": "<ARBITER_MAX_PRICE_PER_CALL>"
}
}
}
}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 |
|---|---|
ARBITER_URLOptional | Arbiter deployment to call. Defaults to the hosted service. |
ARBITER_PRIVATE_KEYRequired, secret | Base64-encoded 64-byte Algorand private key used to pay for calls. The account needs USDC and must be opted in to the USDC asset. Without it every request stops at the paywall. |
ARBITER_MAX_SPEND_USDOptional | Lifetime spending cap for this process, in USD. Enforced before anything is signed. |
ARBITER_MAX_PRICE_PER_CALLOptional | Refuse any single call priced above this, in USD. |
Details
| Package | @arbiterlabs/[email protected] (NPM, stdio) |
| First published | 5 Aug 2026 |
| Last updated | 5 Aug 2026 |
| Registry name | io.github.godwin105/arbiter |
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