Verifiable VRF draws on Arc, 0.05 USDC each. On Robinhood Chain, integrate on chain with the SDK.
Connect Runs on your machine
claude mcp add vrf -e D20_DAILY_LIMIT_USDC=<D20_DAILY_LIMIT_USDC> -e D20_NETWORK=<D20_NETWORK> -e D20_PAY_CHAIN=<D20_PAY_CHAIN> -e D20_WALLET_ADDRESS=<D20_WALLET_ADDRESS> -e D20_CIRCLE_CLI=<D20_CIRCLE_CLI> -e D20_MCP_HOME=<D20_MCP_HOME> -- npx -y @d20dao/[email protected]{
"mcpServers": {
"vrf": {
"command": "npx",
"args": [
"-y",
"@d20dao/[email protected]"
],
"env": {
"D20_DAILY_LIMIT_USDC": "<D20_DAILY_LIMIT_USDC>",
"D20_NETWORK": "<D20_NETWORK>",
"D20_PAY_CHAIN": "<D20_PAY_CHAIN>",
"D20_WALLET_ADDRESS": "<D20_WALLET_ADDRESS>",
"D20_CIRCLE_CLI": "<D20_CIRCLE_CLI>",
"D20_MCP_HOME": "<D20_MCP_HOME>"
}
}
}
}{
"mcpServers": {
"vrf": {
"command": "npx",
"args": [
"-y",
"@d20dao/[email protected]"
],
"env": {
"D20_DAILY_LIMIT_USDC": "<D20_DAILY_LIMIT_USDC>",
"D20_NETWORK": "<D20_NETWORK>",
"D20_PAY_CHAIN": "<D20_PAY_CHAIN>",
"D20_WALLET_ADDRESS": "<D20_WALLET_ADDRESS>",
"D20_CIRCLE_CLI": "<D20_CIRCLE_CLI>",
"D20_MCP_HOME": "<D20_MCP_HOME>"
}
}
}
}{
"servers": {
"vrf": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@d20dao/[email protected]"
],
"env": {
"D20_DAILY_LIMIT_USDC": "<D20_DAILY_LIMIT_USDC>",
"D20_NETWORK": "<D20_NETWORK>",
"D20_PAY_CHAIN": "<D20_PAY_CHAIN>",
"D20_WALLET_ADDRESS": "<D20_WALLET_ADDRESS>",
"D20_CIRCLE_CLI": "<D20_CIRCLE_CLI>",
"D20_MCP_HOME": "<D20_MCP_HOME>"
}
}
}
}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 |
|---|---|
D20_DAILY_LIMIT_USDCOptional | Spending cap per UTC day in USDC (default 1; 0 turns paid draws off). |
D20_NETWORKOptional | Arc Mainnet (default) or Arc Testnet. |
D20_PAY_CHAINOptional | Circle CLI chain code to pay from, such as ARC or BASE (default: first funded). |
D20_WALLET_ADDRESSOptional | Agent wallet to pay from (default: the first one the Circle CLI lists). |
D20_CIRCLE_CLIOptional | Path to the Circle CLI's dist/index.js (default: circle on PATH). |
D20_MCP_HOMEOptional | Folder for the daily spending record (default ~/.d20dao-mcp). |
Details
| Package | @d20dao/[email protected] (NPM, stdio) |
| First published | 9 Oct 2026 |
| Last updated | 9 Oct 2026 |
| Registry name | org.d20dao/vrf |
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