D20DAO Verifiable Randomness

Name: D20DAO Verifiable Randomness
Author: d20dao

by d20daoversion 0.1.2i★ –iRuns on your computer

Registry nameorg.d20dao/vrf

Install

Overview

Description from the maker (original English)

Verifiable VRF draws on Arc, 0.05 USDC each. On Robinhood Chain, integrate on chain with the SDK.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: D20_DAILY_LIMIT_USDC, D20_NETWORK, D20_PAY_CHAIN, D20_WALLET_ADDRESS, D20_CIRCLE_CLI, D20_MCP_HOME

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "vrf": {
      "command": "npx",
      "args": [
        "-y",
        "@d20dao/mcp"
      ],
      "env": {
        "D20_DAILY_LIMIT_USDC": "your-value",
        "D20_NETWORK": "your-value",
        "D20_PAY_CHAIN": "your-value",
        "D20_WALLET_ADDRESS": "your-value",
        "D20_CIRCLE_CLI": "your-value",
        "D20_MCP_HOME": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add vrf --env D20_DAILY_LIMIT_USDC=your-value --env D20_NETWORK=your-value --env D20_PAY_CHAIN=your-value --env D20_WALLET_ADDRESS=your-value --env D20_CIRCLE_CLI=your-value --env D20_MCP_HOME=your-value -- npx -y @d20dao/mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "vrf": {
      "command": "npx",
      "args": [
        "-y",
        "@d20dao/mcp"
      ],
      "env": {
        "D20_DAILY_LIMIT_USDC": "your-value",
        "D20_NETWORK": "your-value",
        "D20_PAY_CHAIN": "your-value",
        "D20_WALLET_ADDRESS": "your-value",
        "D20_CIRCLE_CLI": "your-value",
        "D20_MCP_HOME": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "vrf": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@d20dao/mcp"
      ],
      "env": {
        "D20_DAILY_LIMIT_USDC": "your-value",
        "D20_NETWORK": "your-value",
        "D20_PAY_CHAIN": "your-value",
        "D20_WALLET_ADDRESS": "your-value",
        "D20_CIRCLE_CLI": "your-value",
        "D20_MCP_HOME": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

D20_DAILY_LIMIT_USDC env
Spending cap per UTC day in USDC (default 1; 0 turns paid draws off).
D20_NETWORK env
Arc Mainnet (default) or Arc Testnet.
D20_PAY_CHAIN env
Circle CLI chain code to pay from, such as ARC or BASE (default: first funded).
D20_WALLET_ADDRESS env
Agent wallet to pay from (default: the first one the Circle CLI lists).
D20_CIRCLE_CLI env
Path to the Circle CLI's dist/index.js (default: circle on PATH).
D20_MCP_HOME env
Folder for the daily spending record (default ~/.d20dao-mcp).

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain d20dao.org (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32484 servers in this category
Published to the registry more recently than 59% of the other 32484 servers in this category
Basic checks equal to or better than 100% of the other 32484 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is D20DAO Verifiable Randomness safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.2) reached the registry 28 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Recta

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Remote Desktop Commander

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Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated yesterday

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Recta

by RectaBuild

Cheaper cross-chain stablecoin routes for AI agents; 5 % of the verified saving, nothing if none.

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

D20DAO MCP server

Verifiable randomness for AI agents: dice, coin flips, ranges, winners and shuffles, each one a VRF request on Arc with a proof anyone can replay. 0.05 USDC per draw, paid from your Circle Agent Wallet.

Draws run on Arc through the D20DAO x402 API. D20DAO also runs on Robinhood Chain, where there is no x402 API: a contract there requests randomness directly on chain, using @d20dao/vrf-sdk 0.6.2 and its integration guide.

Setup

Wallet. Have your agent follow Circle's setup guide. It installs the Circle CLI, logs you in with an emailed code and creates an agent wallet. You accept Circle's terms yourself.
Funds. Fund the wallet with USDC and deposit some into Circle Gateway, for example on Arc:

   circle gateway deposit --chain ARC --method direct --amount 1 --address <wallet>

Arc, Polygon, Avalanche, Base, Arbitrum, Optimism, Unichain and Ethereum balances all work.

Server. Add it to your client.

Claude Code:

   claude mcp add d20dao -- npx -y @d20dao/mcp@0.1.2

Claude Desktop, Cursor and others (mcpServers in the client's MCP config):

   { "mcpServers": { "d20dao": { "command": "npx", "args": ["-y", "@d20dao/mcp@0.1.2"] } } }

On Windows, use "command": "cmd" with "args": ["/c", "npx", "-y", "@d20dao/mcp@0.1.2"] if the client cannot start npx directly. Pin the version, since the server runs with your Circle session.

Ask your agent to call setup_status; it names the next step until everything is ready.

Tools

Tool	Cost	Does
`draw`	0.05 USDC	`raw`, `coinFlip`, `dice` (up to 128), `range`, `chooseOne`, `chooseMany`, `shuffle` (up to 256 items). Returns the result with request, fulfillment and proof links.
`get_result`	free	Reads a draw by `paymentId` or a request by `requestId`.
`setup_status`	free	Checks the CLI, login, wallet, Gateway balance and today's spending.

An optional seed (up to 64 bytes) is bound on chain to the draw, so a raffle can name its round before the result exists. Give each separate draw its own seed: an identical draw within five minutes returns the earlier one without paying.

A draw usually answers in about ten seconds, but it can take longer. If your client's tool timeout is short (60 seconds is a common default), raise it; a retry after a timeout returns the same draw rather than paying twice.

Settings

Variable	Default
`D20_DAILY_LIMIT_USDC`	`1`	Spending cap per UTC day, shared by every server process of the user. `0` turns paid draws off.
`D20_NETWORK`	`mainnet`	`testnet` uses the Arc Testnet API and a testnet CLI login (`circle wallet login --testnet`).
`D20_PAY_CHAIN`	first funded	Circle CLI chain code to pay from, such as `ARC` or `BASE`.
`D20_WALLET_ADDRESS`	first agent wallet	Agent wallet to pay from.
`D20_CIRCLE_CLI`	`circle` on PATH	Path to the CLI's `dist/index.js`.
`D20_MCP_HOME`	`~/.d20dao-mcp`	Where the spending record is kept.

Safety

The server holds no keys. The Circle CLI signs, and your Circle wallet limits apply. It never accepts Circle's terms for you: CIRCLE_ACCEPT_TERMS is kept out of the CLI it runs, and DO_NOT_TRACK is set so your item labels stay out of the CLI's telemetry.
It pays only api.d20dao.org (or api-testnet.d20dao.org) and never more than 0.05 USDC per draw. If the CLI ever reports another seller, that draw comes back with a warning and paid draws stop until you delete halt.json from the server's home folder.
Each draw reserves its price in the daily record before paying; if the record cannot be written, it does not pay.
A draw that is still pending is finished for free with get_result. If the answer is lost after payment, the server resends the payment the CLI signed, which the API honours at most once.
A result says charged: false only when that is known. When it says unknown, do not draw again; check with get_result or the wallet.
draw is marked as a tool with side effects, so clients ask before running it unless you allow it.

Verify

Every result links its request and fulfillment transactions and a proof page. Replay the proof yourself with @d20dao/vrf-sdk 0.6.2 or later; see verification and the agent API guide.

License

MIT

D20DAO Verifiable Randomness

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Recta

README from the maker

D20DAO MCP server

Setup

Tools

Settings

Safety

Verify

License