How do I install x402 Universal Payer?

Pick a client above and copy the generated config. Cursor and VS Code also have a deep link when the server can run locally or remotely.

Is x402 Universal Payer official?

No. Registry-listed is not the same as vendor-official. Read the methodology for the difference.

How is the trust score calculated?

This listing scores 50 (Fair). The formula is published on the methodology page.

MCPpedia

x402 Universal Payer MCP Server | MCPpedia

x402 Universal Payer MCP Server

Name: x402 Universal Payer MCP Server
Author: nirholas

Pay any x402 endpoint on the open web: auto-paying bridge with Bazaar discovery and spend caps.

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Registrynirholas

50Fair

Install

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "nirholas-mcp-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/mcp-bridge@1.0.2"
      ],
      "env": {
        "MCP_BRIDGE_EVM_PRIVATE_KEY": "YOUR_MCP_BRIDGE_EVM_PRIVATE_KEY",
        "MCP_BRIDGE_SVM_PRIVATE_KEY": "YOUR_MCP_BRIDGE_SVM_PRIVATE_KEY",
        "MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC": "100000",
        "MCP_BRIDGE_MAX_TOTAL_ATOMIC": "1000000",
        "MCP_BRIDGE_ALLOWED_PAYTO": "",
        "MCP_BRIDGE_ALLOWED_HOSTS": "",
        "MCP_BRIDGE_ALLOW_HTTP": "0",
        "MCP_BRIDGE_DISCOVER_LIMIT": "20",
        "MCP_BRIDGE_BAZAAR_URL": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
        "MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER": "5",
        "MCP_BRIDGE_MAX_DEPOSIT_ATOMIC": "5000000",
        "X402_MCP_BRIDGE_CHANNELS_DIR": "~/.x402-mcp-bridge/channels",
        "RPC_URL_8453": ""
      }
    }
  }
}

Install guide

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Environment

Name	Required	Notes
MCP_BRIDGE_EVM_PRIVATE_KEY	No	0x-prefixed 32-byte hex private key that funds USDC payments on EVM chains (Base, Arbitrum, …). At least one of the EVM/SVM keys is required. Treat like cash — use a dedicated low-balance wallet. Secret.
MCP_BRIDGE_SVM_PRIVATE_KEY	No	Solana secret key that funds USDC payments: base58 64-byte secret key (Phantom / solana-keygen format) or a JSON array of 64 integers. At least one of the EVM/SVM keys is required. Treat like cash. Secret.
MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC	No	Per-call spending cap in atomic units (USDC has 6 decimals). Payments above this abort with a clear reason.
MCP_BRIDGE_MAX_TOTAL_ATOMIC	No	Cumulative session spending ceiling in atomic units. Once total spend would exceed it, further payments abort until restart.
MCP_BRIDGE_ALLOWED_PAYTO	No	Comma-separated payee allowlist. When set, any payment whose payTo address is not listed is refused.
MCP_BRIDGE_ALLOWED_HOSTS	No	Comma-separated hostname allowlist for outbound paid requests. When set, any other host is refused before a request is signed.
MCP_BRIDGE_ALLOW_HTTP	No	Set to 1 to allow http:// targets (local development only). https is enforced otherwise.
MCP_BRIDGE_DISCOVER_LIMIT	No	Max number of x402 Bazaar resources to register as dynamic tools at startup. Set 0 to disable discovery.
MCP_BRIDGE_BAZAAR_URL	No	x402 Bazaar discovery endpoint. Override to point at a self-hosted or alternative bazaar.
MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER	No	How many request-amounts to deposit at once when opening an EVM batch-settlement channel.
MCP_BRIDGE_MAX_DEPOSIT_ATOMIC	No	Hard cap in atomic units on a single batch-settlement channel deposit or top-up.
X402_MCP_BRIDGE_CHANNELS_DIR	No	Directory for persisted batch-settlement channel state (survives client restarts).
RPC_URL_8453	No	Per-chain RPC override, one variable per chain id (RPC_URL_<chainId>, e.g. RPC_URL_8453 for Base). Defaults to viem's public RPC for that chain.

x402 Universal Payer MCP Server

Install

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