x402 Universal Payer MCP Server

One MCP server that can pay any x402-paid endpoint on the open web - the universal x402 payer for AI agents.

People who work with Bridge and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in JavaScript.

One of 37 MCP servers published from nirholas/three.ws. Stars and repository activity are shared across all of them. See all 37 →

VERIFIED ACTIVE

LAST COMMIT 2026-09-18 · VERIFIED 2026-09-18

Apache-2.0 · JavaScript servers · how we verify → /methodology

01 · Install x402 Universal Payer

before you install - you'll need

Set MCP_BRIDGE_EVM_PRIVATE_KEY, MCP_BRIDGE_SVM_PRIVATE_KEY, MCP_BRIDGE_DISCOVER_LIMIT before connecting. MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC is optional or environment-specific per the README.

Claude Code

claude mcp add nirholas-three.ws-mcp-bridge -- npx -y @three-ws/mcp-bridge

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "nirholas-three.ws-mcp-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/mcp-bridge"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license Apache-2.0 - declared in the repository

npm package @three-ws/mcp-bridge - the @three-ws scope differs from the repo owner (nirholas); confirm it's the project's official package

registry namespace io.github.nirholas is GitHub-verified and matches the repo owner

03 · What x402 Universal Payer can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 1 documented tool, including list_bazaar_tools.

The 1 tools it gives your agent

Extracted from the project's README - what x402 Universal Payer lets an agent do.

list_bazaar_tools: - readOnlyHint: true, idempotentHint: true, openWorldHint: false. Pure in-process cache read; free, no network.

Latest releases

v1.0.0 · 2026-08-28

!three.ws · three.ws is an Android app. Install it and the platform opens full-screen, with no browser chrome around it, and every signature is routed to the wallet on your phone. · Install · 1. Open…

04 · Who maintains x402 Universal Payer

x402 Universal Payer is maintained by nirholas. We track 66 MCP servers from nirholas - 65 actively maintained, 7,838 combined GitHub stars, oldest repo from Feb 2024. Full record: all servers from nirholas.

05 · Facts

repository: github.com/nirholas/three.ws
website: https://three.ws/
category: AI & ML - actively maintained as of 2026-09-18.
registry: io.github.nirholas/x402-bridge (active, first published 2026-06-13 · 3 versions)
packages: npm:@three-ws/mcp-bridge

06 · x402 Universal Payer FAQ

What is x402 Universal Payer?

One MCP server that can pay any x402-paid endpoint on the open web - the universal x402 payer for AI agents.

Is x402 Universal Payer still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-18. We re-verify nightly.

How do I install x402 Universal Payer?

Run `npx -y @three-ws/mcp-bridge`. The README documents 4 environment variables (MCP_BRIDGE_EVM_PRIVATE_KEY, MCP_BRIDGE_SVM_PRIVATE_KEY, MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC…) to set first. Set MCP_BRIDGE_EVM_PRIVATE_KEY, MCP_BRIDGE_SVM_PRIVATE_KEY, MCP_BRIDGE_DISCOVER_LIMIT before connecting. MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC is optional or environment-specific per the README. You can also paste the ready-made client config above.

Does x402 Universal Payer run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to x402 Universal Payer

Alternatives to x402 Universal Payer

Maintained AI & ML servers if x402 Universal Payer isn't the fit.

Pairs well with

Servers that cover what x402 Universal Payer doesn't - only shown when the pairing reason fits the companion.

More AI & ML MCP servers · three.ws 3D Agent Tools · three.ws Activity · three.ws AgenC · Agent Sniper · three.ws Agent Payments