Chainweb API

Name: Chainweb API
Author: Pact-Community-Organization

by Pact-Community-Organizationversion 0.2.3i★ –iRuns on your computer

Registry nameio.github.Pact-Community-Organization/chainweb

Install

Overview

Description from the maker (original English)

Chainweb HTTP API: local sim, pre-signed send, poll, table reads, SPV proofs, module deploys.

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
You need to fill in: PACT_COMMUNITY_WORKSPACE_ROOT, PACT_COMMUNITY_CHAINWEB_MODE

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: PACT_COMMUNITY_WORKSPACE_ROOT, PACT_COMMUNITY_CHAINWEB_MODE, PACT_COMMUNITY_CHAINWEB_PROFILE, PACT_COMMUNITY_CHAINWEB_BASE_URL, PACT_COMMUNITY_CHAINWEB_NETWORK_ID

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": {
    "chainweb": {
      "command": "npx",
      "args": [
        "-y",
        "@pact-community/mcp-chainweb"
      ],
      "env": {
        "PACT_COMMUNITY_WORKSPACE_ROOT": "your-value",
        "PACT_COMMUNITY_CHAINWEB_MODE": "your-value",
        "PACT_COMMUNITY_CHAINWEB_PROFILE": "your-value",
        "PACT_COMMUNITY_CHAINWEB_BASE_URL": "your-value",
        "PACT_COMMUNITY_CHAINWEB_NETWORK_ID": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add chainweb --env PACT_COMMUNITY_WORKSPACE_ROOT=your-value --env PACT_COMMUNITY_CHAINWEB_MODE=your-value --env PACT_COMMUNITY_CHAINWEB_PROFILE=your-value --env PACT_COMMUNITY_CHAINWEB_BASE_URL=your-value --env PACT_COMMUNITY_CHAINWEB_NETWORK_ID=your-value -- npx -y @pact-community/mcp-chainweb

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": {
    "chainweb": {
      "command": "npx",
      "args": [
        "-y",
        "@pact-community/mcp-chainweb"
      ],
      "env": {
        "PACT_COMMUNITY_WORKSPACE_ROOT": "your-value",
        "PACT_COMMUNITY_CHAINWEB_MODE": "your-value",
        "PACT_COMMUNITY_CHAINWEB_PROFILE": "your-value",
        "PACT_COMMUNITY_CHAINWEB_BASE_URL": "your-value",
        "PACT_COMMUNITY_CHAINWEB_NETWORK_ID": "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": {
    "chainweb": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@pact-community/mcp-chainweb"
      ],
      "env": {
        "PACT_COMMUNITY_WORKSPACE_ROOT": "your-value",
        "PACT_COMMUNITY_CHAINWEB_MODE": "your-value",
        "PACT_COMMUNITY_CHAINWEB_PROFILE": "your-value",
        "PACT_COMMUNITY_CHAINWEB_BASE_URL": "your-value",
        "PACT_COMMUNITY_CHAINWEB_NETWORK_ID": "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

PACT_COMMUNITY_WORKSPACE_ROOT required env
Workspace root directory; all file access is confined inside it.
PACT_COMMUNITY_CHAINWEB_MODE required env
Network mode; must be set and match PACT_COMMUNITY_CHAINWEB_PROFILE (devnet, testnet06, or mainnet).
PACT_COMMUNITY_CHAINWEB_PROFILE env
Network profile: devnet (default, read/write), testnet06, or mainnet (both read-only).
PACT_COMMUNITY_CHAINWEB_BASE_URL env
Chainweb node base URL (default per profile).
PACT_COMMUNITY_CHAINWEB_NETWORK_ID env
Network id, e.g. development, testnet06, mainnet01 (default per profile).

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 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Pact-Community-Organization, which owns the repo
… 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 18379 servers in this category
Published to the registry more recently than 13% of the other 18379 servers in this category
Basic checks equal to or better than 100% of the other 18379 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 Chainweb API 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?

You need to fill in: PACT_COMMUNITY_WORKSPACE_ROOT, PACT_COMMUNITY_CHAINWEB_MODE

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 (0.2.3) reached the registry 4 months 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, NexusWindows

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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.

pact-mcp — MCP servers for Pact & Chainweb

Model Context Protocol servers that give your AI agent safe, auditable access to the Pact 5 development loop on Kadena Chainweb.

Run REPL tests, scan modules for critical language traps, estimate gas, and query or submit to Chainweb nodes — from Claude, Cursor, VS Code, or any MCP-compatible client. Every tool runs behind a strict, tested security baseline, and no tool ever touches a private key.

"mcpServers": { "pact": { "command": "npx", "args": ["-y", "@pact-community/mcp-pact"], "env": { "PACT_COMMUNITY_WORKSPACE_ROOT": "/path/to/your/project" } } } }

Servers

Server	Install	Tools	What it does
Pact Tooling — `@pact-community/mcp-pact`		6	REPL test runs, critical-trap scanning, gas estimation, interface diff, format checks
Chainweb API — `@pact-community/mcp-chainweb`		11	`/local` simulation, pre-signed `/send`, poll, table reads, SPV proofs, module deploys

Both are listed in the official MCP registry as io.github.Pact-Community-Organization/pact and io.github.Pact-Community-Organization/chainweb.

Install

VS Code (one click)

Using VS Code with GitHub Copilot? Install with a single click:

The button opens VS Code and pre-fills the configuration. You can also search the MCP Servers view, or add from the command line:

code --add-mcp '{"name":"pact","command":"npx","args":["-y","@pact-community/mcp-pact"],"env":{"PACT_COMMUNITY_WORKSPACE_ROOT":"${workspaceFolder}","PACT_COMMUNITY_PACT_BIN":"pact"}}'

On VS Code Insiders, use vscode-insiders: in the links or code-insiders on

the command line.

Claude Code

claude mcp add pact -e PACT_COMMUNITY_WORKSPACE_ROOT=/path/to/your/project \

-- npx -y @pact-community/mcp-pact

Any MCP client

Add both servers to your client configuration:

"mcpServers": { "pact": { "command": "npx", "args": ["-y", "@pact-community/mcp-pact"], "env": { "PACT_COMMUNITY_WORKSPACE_ROOT": "/path/to/your/project", "PACT_COMMUNITY_PACT_BIN": "pact" } }, "chainweb": { "command": "npx", "args": ["-y", "@pact-community/mcp-chainweb"], "env": { "PACT_COMMUNITY_WORKSPACE_ROOT": "/path/to/your/project", "PACT_COMMUNITY_CHAINWEB_MODE": "devnet", "PACT_COMMUNITY_CHAINWEB_PROFILE": "devnet", "PACT_COMMUNITY_CHAINWEB_BASE_URL": "http://localhost:8081", "PACT_COMMUNITY_CHAINWEB_NETWORK_ID": "development" } } } }

Each server's README documents its full tool list and environment variables: Pact Tooling · Chainweb API.

Your first 10 minutes

Install the Pact CLI — Pact Tooling uses it for REPL runs and gas estimation. Download a release from kadena-io/pact-5, put pact on your PATH, and verify with pact --version.
Add the servers to your client with the config above, pointing PACT_COMMUNITY_WORKSPACE_ROOT at your contract project.
Ask your agent:

*"Scan contracts/token.pact for critical Pact 5 traps"* — flags non-binary +, DB reads inside enforce, built-in shadowing, and more.
*"Run tests/token.repl and summarize the failures"* — executes the file with the real Pact interpreter and parses the results.
*"Diff the public interface of token.pact against token-v2.pact"* — reports added/removed/changed functions and whether the change is breaking.
*"What's the current block height on chain 0?"* — queries a Chainweb node.

Everything in Pact Tooling works with just the CLI — no node required. Chainweb API works against any Chainweb-compatible node: point PACT_COMMUNITY_CHAINWEB_BASE_URL at your devnet, or use the read-only testnet06 / mainnet profiles to query public networks.

Security

Both servers enforce the same tested baseline (details in SECURITY.md):

No private keys, ever. chainweb_send, chainweb_deploy_module, and chainweb_continue_pact require transactions to be signed externally (Ledger, @kadena/client, …) and passed in pre-signed.
Read-only public networks. The testnet06 and mainnet profiles block every write tool with PROFILE_WRITE_BLOCKED.
Audit logging of every tool call with SHA-256 input hashes (never raw inputs).
Prompt-injection stripping on all tool output before it reaches the model.
Tool-schema locking — a server refuses to start if its tool schemas drift.
Network and filesystem allowlists, no shell execution, and refusal to run as root.

Compatibility

Server	Local devnet	Testnet	Mainnet
Pact Tooling	✅	—	—
Chainweb API	✅	✅ read-only	✅ read-only

Contributing

git clone https://github.com/Pact-Community-Organization/pact-mcp.git

cd pact-mcp pnpm install pnpm build pnpm test

Requires Node.js >= 20.11 and pnpm >= 9. See CONTRIBUTING.md for workflow, coding standards, and how to add or change a tool.

License

Apache-2.0

Chainweb API

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

NexusWindows

README from the maker

pact-mcp — MCP servers for Pact & Chainweb

Servers

Install

VS Code (one click)

Claude Code

Any MCP client

Your first 10 minutes

Security

Compatibility

Contributing

License