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Chainweb API MCP server

by Pact-Community-Organization·io.github.Pact-Community-Organization/chainweb·v0.2.3
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Chainweb HTTP API: local sim, pre-signed send, poll, table reads, SPV proofs, module deploys.

A91/100grade A
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Safety scan
A91/100

full report

Adoption
Growing

0 stars51 downloads/wk

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Chainweb API tools (11, 3 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • chainweb.chain_time

    Return the latest block header for a chain (creationTimeSec, blockHeight, blockHash).

  • chainweb.continue_pact

    Build a continuation cmd (scoped signer) for a defpact step, preflight via /local on the target chain, and submit iff sigs are supplied. Caller must supply any SPV proof (see chainweb.spv_proof) and manage transitive-deps.

  • chainweb.deploy_modulewrite action

    Build an UNSCOPED-signer deploy tx (with create-table calls in the same tx), preflight via /local, and — iff sigs are supplied — submit to /send. Without sigs, returns the unsigned envelope for external signing. NEVER accepts private keys.

  • chainweb.info

    Fetch /info and /cut from the configured chainweb profile. Refuses if the network id differs from the configured expectation.

  • chainweb.keys

    List row keys of a Pact table (truncated at `limit`). O(n) on-chain — large tables may exceed gas.

  • chainweb.localwrite action

    Execute Pact code against /local with preflight=true. Read-only. Returns unwrapped Pact values.

  • chainweb.poll

    Poll /poll (NOT /listen — nginx 504 trap) until request keys resolve or timeout. Returns unwrapped results.

  • chainweb.principal_namespace

    Compute the deterministic n_<40hex> principal namespace name from a keyset via /local (ns.create-principal-namespace).

  • chainweb.read_table

    Read a single row from a Pact table via /local. Auto-unwraps Pact JSON types. Missing key returns keyFound=false (not an error).

  • chainweb.sendwrite action

    Run local preflight on a pre-signed {cmd,hash,sigs} tx. Refuses on preflight failure. POSTs to /send and returns { requestKey, preflight }.

  • chainweb.spv_proof

    Fetch the base64 SPV proof for a cross-chain request key from /chain/<source>/pact/spv. Not-ready responses surface as ready=false (not an error). Pass proof through to chainweb.continue_pact.

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings
  • Code scan35 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 22 days ago15/15
  • Maintainer identityregistry namespace matches repository owner7/10
Overall 91/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Chainweb API compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
91/100
higher than 85% of 48,255 servers
Tools
11
the typical server has 7
Tools that change things
27%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
51
more than 43% of 12,191 servers with a package

What its tools let an agent do: 8 read · 1 change · 1 send or post · 1 run or deploy

Install Chainweb API in Claude Code, Cursor or VS Code

Runs npx -y @pact-community/mcp-chainweb on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add chainweb -- npx -y @pact-community/mcp-chainweb
Add to Cursor

What the publisher says

From the Chainweb API repository's README, as published. We do not edit it. Read it on GitHub

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

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:

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Chainweb API: common questions

Is Chainweb API MCP server safe?
Yes, by our scan: it is graded A (91/100). Read the Chainweb API safety report
How do I install Chainweb API?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Chainweb API need an API key?
No secret keys are declared. It reads 5 settings from the environment.
Is Chainweb API maintained?
The last commit was 61 days ago (2026-09-04). The latest release is v0.2.3.
How does Chainweb API compare with other MCP servers?
safety score 91/100 (higher than 85% of 48,255 servers); tools 11 (the typical server has 7); tools that change things 27% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.