SERVER

x402 Universal Payer

Rank #8,791

io.github.nirholas/x402-bridge

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

3 versions

237 GitHub stars

by nirholas (95 servers)View repository ↗

First listed

Jun 13, 2026

Last publish date

Aug 19, 2026

PURPOSE

What you can do with x402 Universal Payer

x402 Universal Payer is a Model Context Protocol (MCP) server published by nirholas. It ranks #8,791 of 144,396 active servers on MCP Toplist, and its repository has 237 GitHub stars. x402 Universal Payer is listed on Official MCP, with 3 tracked versions. It was first listed on Jun 13, 2026 and most recently updated on Aug 19, 2026.

Not verifiedMCP Toplist has not yet written a checked profile for this server, so the paragraph above is assembled from registry data only. The repository README is the authority on what it does.

CAPABILITIES AND LIMITATIONS

What x402 Universal Payer can and cannot do

Not verifiedMCP Toplist has not catalogued this server's tools or limitations. The repository README lists them.

REQUIREMENTS

What you need before using x402 Universal Payer

DeclaredNo credentialsNo credentials declared

The registry listing declares no required environment variables or authentication. This is declared metadata, not a verified install — the repository README is the authority.

Declared by the Official MCP Registry, last synced Oct 16, 2026. Not independently verified by MCP Toplist.

Declared in the registry install config

MCP_BRIDGE_EVM_PRIVATE_KEY · optional
MCP_BRIDGE_SVM_PRIVATE_KEY · optional
MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC · optional
MCP_BRIDGE_MAX_TOTAL_ATOMIC · optional
MCP_BRIDGE_ALLOWED_PAYTO · optional
MCP_BRIDGE_ALLOWED_HOSTS · optional
MCP_BRIDGE_ALLOW_HTTP · optional
MCP_BRIDGE_DISCOVER_LIMIT · optional
MCP_BRIDGE_BAZAAR_URL · optional
MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER · optional
MCP_BRIDGE_MAX_DEPOSIT_ATOMIC · optional
X402_MCP_BRIDGE_CHANNELS_DIR · optional
RPC_URL_8453 · optional

INSTALLATION AND FIRST TASK

Connect x402 Universal Payer and confirm it works

npm package

claude mcp add x402-bridge -e "MCP_BRIDGE_EVM_PRIVATE_KEY=<your MCP_BRIDGE_EVM_PRIVATE_KEY>" -e "MCP_BRIDGE_SVM_PRIVATE_KEY=<your MCP_BRIDGE_SVM_PRIVATE_KEY>" -e "MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC=<your MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC>" -e "MCP_BRIDGE_MAX_TOTAL_ATOMIC=<your MCP_BRIDGE_MAX_TOTAL_ATOMIC>" -e "MCP_BRIDGE_ALLOWED_PAYTO=<your MCP_BRIDGE_ALLOWED_PAYTO>" -e "MCP_BRIDGE_ALLOWED_HOSTS=<your MCP_BRIDGE_ALLOWED_HOSTS>" -e "MCP_BRIDGE_ALLOW_HTTP=<your MCP_BRIDGE_ALLOW_HTTP>" -e "MCP_BRIDGE_DISCOVER_LIMIT=<your MCP_BRIDGE_DISCOVER_LIMIT>" -e "MCP_BRIDGE_BAZAAR_URL=<your MCP_BRIDGE_BAZAAR_URL>" -e "MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER=<your MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER>" -e "MCP_BRIDGE_MAX_DEPOSIT_ATOMIC=<your MCP_BRIDGE_MAX_DEPOSIT_ATOMIC>" -e "X402_MCP_BRIDGE_CHANNELS_DIR=<your X402_MCP_BRIDGE_CHANNELS_DIR>" -e "RPC_URL_8453=<your RPC_URL_8453>" -- npx -y @three-ws/mcp-bridge

Replace each placeholder with your own value before saving.

npm package

[mcp_servers.x402-bridge]
command = "npx"
args = ["-y", "@three-ws/mcp-bridge"]

[mcp_servers.x402-bridge.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 = "<your MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC>"
MCP_BRIDGE_MAX_TOTAL_ATOMIC = "<your MCP_BRIDGE_MAX_TOTAL_ATOMIC>"
MCP_BRIDGE_ALLOWED_PAYTO = "<your MCP_BRIDGE_ALLOWED_PAYTO>"
MCP_BRIDGE_ALLOWED_HOSTS = "<your MCP_BRIDGE_ALLOWED_HOSTS>"
MCP_BRIDGE_ALLOW_HTTP = "<your MCP_BRIDGE_ALLOW_HTTP>"
MCP_BRIDGE_DISCOVER_LIMIT = "<your MCP_BRIDGE_DISCOVER_LIMIT>"
MCP_BRIDGE_BAZAAR_URL = "<your MCP_BRIDGE_BAZAAR_URL>"
MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER = "<your MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER>"
MCP_BRIDGE_MAX_DEPOSIT_ATOMIC = "<your MCP_BRIDGE_MAX_DEPOSIT_ATOMIC>"
X402_MCP_BRIDGE_CHANNELS_DIR = "<your X402_MCP_BRIDGE_CHANNELS_DIR>"
RPC_URL_8453 = "<your RPC_URL_8453>"

Add to ~/.codex/config.toml. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "x402-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/mcp-bridge"
      ],
      "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": "<your MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC>",
        "MCP_BRIDGE_MAX_TOTAL_ATOMIC": "<your MCP_BRIDGE_MAX_TOTAL_ATOMIC>",
        "MCP_BRIDGE_ALLOWED_PAYTO": "<your MCP_BRIDGE_ALLOWED_PAYTO>",
        "MCP_BRIDGE_ALLOWED_HOSTS": "<your MCP_BRIDGE_ALLOWED_HOSTS>",
        "MCP_BRIDGE_ALLOW_HTTP": "<your MCP_BRIDGE_ALLOW_HTTP>",
        "MCP_BRIDGE_DISCOVER_LIMIT": "<your MCP_BRIDGE_DISCOVER_LIMIT>",
        "MCP_BRIDGE_BAZAAR_URL": "<your MCP_BRIDGE_BAZAAR_URL>",
        "MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER": "<your MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER>",
        "MCP_BRIDGE_MAX_DEPOSIT_ATOMIC": "<your MCP_BRIDGE_MAX_DEPOSIT_ATOMIC>",
        "X402_MCP_BRIDGE_CHANNELS_DIR": "<your X402_MCP_BRIDGE_CHANNELS_DIR>",
        "RPC_URL_8453": "<your RPC_URL_8453>"
      }
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config). Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "x402-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/mcp-bridge"
      ],
      "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": "<your MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC>",
        "MCP_BRIDGE_MAX_TOTAL_ATOMIC": "<your MCP_BRIDGE_MAX_TOTAL_ATOMIC>",
        "MCP_BRIDGE_ALLOWED_PAYTO": "<your MCP_BRIDGE_ALLOWED_PAYTO>",
        "MCP_BRIDGE_ALLOWED_HOSTS": "<your MCP_BRIDGE_ALLOWED_HOSTS>",
        "MCP_BRIDGE_ALLOW_HTTP": "<your MCP_BRIDGE_ALLOW_HTTP>",
        "MCP_BRIDGE_DISCOVER_LIMIT": "<your MCP_BRIDGE_DISCOVER_LIMIT>",
        "MCP_BRIDGE_BAZAAR_URL": "<your MCP_BRIDGE_BAZAAR_URL>",
        "MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER": "<your MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER>",
        "MCP_BRIDGE_MAX_DEPOSIT_ATOMIC": "<your MCP_BRIDGE_MAX_DEPOSIT_ATOMIC>",
        "X402_MCP_BRIDGE_CHANNELS_DIR": "<your X402_MCP_BRIDGE_CHANNELS_DIR>",
        "RPC_URL_8453": "<your RPC_URL_8453>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project). Replace each placeholder with your own value before saving.

npm package

{
  "servers": {
    "x402-bridge": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/mcp-bridge"
      ],
      "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": "<your MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC>",
        "MCP_BRIDGE_MAX_TOTAL_ATOMIC": "<your MCP_BRIDGE_MAX_TOTAL_ATOMIC>",
        "MCP_BRIDGE_ALLOWED_PAYTO": "<your MCP_BRIDGE_ALLOWED_PAYTO>",
        "MCP_BRIDGE_ALLOWED_HOSTS": "<your MCP_BRIDGE_ALLOWED_HOSTS>",
        "MCP_BRIDGE_ALLOW_HTTP": "<your MCP_BRIDGE_ALLOW_HTTP>",
        "MCP_BRIDGE_DISCOVER_LIMIT": "<your MCP_BRIDGE_DISCOVER_LIMIT>",
        "MCP_BRIDGE_BAZAAR_URL": "<your MCP_BRIDGE_BAZAAR_URL>",
        "MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER": "<your MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER>",
        "MCP_BRIDGE_MAX_DEPOSIT_ATOMIC": "<your MCP_BRIDGE_MAX_DEPOSIT_ATOMIC>",
        "X402_MCP_BRIDGE_CHANNELS_DIR": "<your X402_MCP_BRIDGE_CHANNELS_DIR>",
        "RPC_URL_8453": "<your RPC_URL_8453>"
      }
    }
  }
}

Save as .vscode/mcp.json in your workspace. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "x402-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/mcp-bridge"
      ],
      "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": "<your MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC>",
        "MCP_BRIDGE_MAX_TOTAL_ATOMIC": "<your MCP_BRIDGE_MAX_TOTAL_ATOMIC>",
        "MCP_BRIDGE_ALLOWED_PAYTO": "<your MCP_BRIDGE_ALLOWED_PAYTO>",
        "MCP_BRIDGE_ALLOWED_HOSTS": "<your MCP_BRIDGE_ALLOWED_HOSTS>",
        "MCP_BRIDGE_ALLOW_HTTP": "<your MCP_BRIDGE_ALLOW_HTTP>",
        "MCP_BRIDGE_DISCOVER_LIMIT": "<your MCP_BRIDGE_DISCOVER_LIMIT>",
        "MCP_BRIDGE_BAZAAR_URL": "<your MCP_BRIDGE_BAZAAR_URL>",
        "MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER": "<your MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER>",
        "MCP_BRIDGE_MAX_DEPOSIT_ATOMIC": "<your MCP_BRIDGE_MAX_DEPOSIT_ATOMIC>",
        "X402_MCP_BRIDGE_CHANNELS_DIR": "<your X402_MCP_BRIDGE_CHANNELS_DIR>",
        "RPC_URL_8453": "<your RPC_URL_8453>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json. Replace each placeholder with your own value before saving.

npm package

{
  "mcpServers": {
    "x402-bridge": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/mcp-bridge"
      ],
      "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": "<your MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC>",
        "MCP_BRIDGE_MAX_TOTAL_ATOMIC": "<your MCP_BRIDGE_MAX_TOTAL_ATOMIC>",
        "MCP_BRIDGE_ALLOWED_PAYTO": "<your MCP_BRIDGE_ALLOWED_PAYTO>",
        "MCP_BRIDGE_ALLOWED_HOSTS": "<your MCP_BRIDGE_ALLOWED_HOSTS>",
        "MCP_BRIDGE_ALLOW_HTTP": "<your MCP_BRIDGE_ALLOW_HTTP>",
        "MCP_BRIDGE_DISCOVER_LIMIT": "<your MCP_BRIDGE_DISCOVER_LIMIT>",
        "MCP_BRIDGE_BAZAAR_URL": "<your MCP_BRIDGE_BAZAAR_URL>",
        "MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER": "<your MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER>",
        "MCP_BRIDGE_MAX_DEPOSIT_ATOMIC": "<your MCP_BRIDGE_MAX_DEPOSIT_ATOMIC>",
        "X402_MCP_BRIDGE_CHANNELS_DIR": "<your X402_MCP_BRIDGE_CHANNELS_DIR>",
        "RPC_URL_8453": "<your RPC_URL_8453>"
      }
    }
  }
}

Replace each placeholder with your own value before saving.

First successful task

After adding the config, ask your client to list this server's tools. A tool list confirms the connection; an empty list or an error means the server did not start or needs credentials.

ALTERNATIVES

When to choose another server

Other servers by nirholas

View all nirholas servers →

No task-specific alternatives are catalogued for x402 Universal Payeryet; the list above is its publisher's other servers.

MAINTENANCE AND EVIDENCE

What changed, and when this was checked

First listed: Jun 13, 2026
Latest version published: Aug 19, 2026
Version history: 3 versions tracked (below)
Requirements evidence: Declared by the Official MCP Registry, last synced Oct 16, 2026. Not independently verified by MCP Toplist.
Profile checked: Not yet — purpose, capabilities and requirements above come from registry data only
Ranking data as of: Aug 19, 2026

Registry sightings

Official MCP ↗listed since Jul 24, 2026 · still listed

Do you maintain x402 Universal Payer? to correct or enrich this profile.

VERSIONS

Available versions (3)

Version	Published
1.0.2	Aug 19, 2026
1.0.1	Jul 20, 2026
1.0.0	Jun 13, 2026

STANDING

#8,791of 144,396 active serversTop 10%

Ranks ahead of 135,605 of 144,396 servers on MCP Toplist.

Recent momentum

+151GitHub stars since Jul 20 (+176%)

BADGE

Show your rank

Maintain this server? Add the live rank badge to your README — it updates automatically as the leaderboard changes.

Markdown

[![MCP Toplist](https://mcptoplist.com/badge/io.github.nirholas%2Fx402-bridge.svg)](https://mcptoplist.com/server/io.github.nirholas%2Fx402-bridge)

HTML

<a href="https://mcptoplist.com/server/io.github.nirholas%2Fx402-bridge"><img src="https://mcptoplist.com/badge/io.github.nirholas%2Fx402-bridge.svg" alt="MCP Toplist: Top 10% of 144,396" /></a>

Variants: append ?metric=score or ?metric=stars to the image URL.

FAQ

Frequently asked questions

Who maintains x402 Universal Payer?: x402 Universal Payer is maintained by nirholas, which publishes 95 MCP servers (226 total versions) tracked on MCP Toplist.
Is x402 Universal Payer listed on the Official MCP Registry?: Yes — x402 Universal Payer is listed on the Official MCP Registry.
How many versions does x402 Universal Payer have?: MCP Toplist tracks 3 versions of x402 Universal Payer, most recently published on Aug 19, 2026.
Where can I find the source code for x402 Universal Payer?: The source code for x402 Universal Payer is hosted at github.com/nirholas/three.ws.

Used in projects

Do you run this server?

Community projects list the MCP servers behind real agents and apps. Publish yours and this page will link to it.

EXPLORE

All MCP Servers Official MCP Servers GitHub MCP Servers Best MCP Servers Most Active MCP Servers New MCP Servers Best New MCP Servers