x402 Universal Payer
local MCP serverInstallation
Terminal
claude mcp add x402-bridge -e MCP_BRIDGE_EVM_PRIVATE_KEY=... -e MCP_BRIDGE_SVM_PRIVATE_KEY=... -e MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC=... -e MCP_BRIDGE_MAX_TOTAL_ATOMIC=... -e MCP_BRIDGE_ALLOWED_PAYTO=... -e MCP_BRIDGE_ALLOWED_HOSTS=... -e MCP_BRIDGE_ALLOW_HTTP=... -e MCP_BRIDGE_DISCOVER_LIMIT=... -e MCP_BRIDGE_BAZAAR_URL=... -e MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER=... -e MCP_BRIDGE_MAX_DEPOSIT_ATOMIC=... -e X402_MCP_BRIDGE_CHANNELS_DIR=... -e RPC_URL_8453=... -- npx -y @three-ws/mcp-bridge
Run in your project folder. Add --scope user to use it everywhere.
Claude Desktop, Cursor & other clients
Add to claude_desktop_config.json or .cursor/mcp.json.
{
"mcpServers": {
"x402-bridge": {
"command": "npx",
"args": [
"-y",
"@three-ws/mcp-bridge"
],
"env": {
"MCP_BRIDGE_EVM_PRIVATE_KEY": "...",
"MCP_BRIDGE_SVM_PRIVATE_KEY": "...",
"MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC": "...",
"MCP_BRIDGE_MAX_TOTAL_ATOMIC": "...",
"MCP_BRIDGE_ALLOWED_PAYTO": "...",
"MCP_BRIDGE_ALLOWED_HOSTS": "...",
"MCP_BRIDGE_ALLOW_HTTP": "...",
"MCP_BRIDGE_DISCOVER_LIMIT": "...",
"MCP_BRIDGE_BAZAAR_URL": "...",
"MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER": "...",
"MCP_BRIDGE_MAX_DEPOSIT_ATOMIC": "...",
"X402_MCP_BRIDGE_CHANNELS_DIR": "...",
"RPC_URL_8453": "..."
}
}
}
}Fill in the environment variables with your own credentials.
Summary
Pay any x402 endpoint on the open web: auto-paying bridge with Bazaar discovery and spend caps.
Questions
x402 Universal Payer is a local MCP server distributed as the npm package @three-ws/mcp-bridge.
Run: claude mcp add x402-bridge -e MCP_BRIDGE_EVM_PRIVATE_KEY=... -e MCP_BRIDGE_SVM_PRIVATE_KEY=... -e MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC=... -e MCP_BRIDGE_MAX_TOTAL_ATOMIC=... -e MCP_BRIDGE_ALLOWED_PAYTO=... -e MCP_BRIDGE_ALLOWED_HOSTS=... -e MCP_BRIDGE_ALLOW_HTTP=... -e MCP_BRIDGE_DISCOVER_LIMIT=... -e MCP_BRIDGE_BAZAAR_URL=... -e MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER=... -e MCP_BRIDGE_MAX_DEPOSIT_ATOMIC=... -e X402_MCP_BRIDGE_CHANNELS_DIR=... -e RPC_URL_8453=... -- npx -y @three-ws/mcp-bridge
Run: codex mcp add x402-bridge --env MCP_BRIDGE_EVM_PRIVATE_KEY=... --env MCP_BRIDGE_SVM_PRIVATE_KEY=... --env MCP_BRIDGE_MAX_PRICE_PER_CALL_ATOMIC=... --env MCP_BRIDGE_MAX_TOTAL_ATOMIC=... --env MCP_BRIDGE_ALLOWED_PAYTO=... --env MCP_BRIDGE_ALLOWED_HOSTS=... --env MCP_BRIDGE_ALLOW_HTTP=... --env MCP_BRIDGE_DISCOVER_LIMIT=... --env MCP_BRIDGE_BAZAAR_URL=... --env MCP_BRIDGE_BATCH_DEPOSIT_MULTIPLIER=... --env MCP_BRIDGE_MAX_DEPOSIT_ATOMIC=... --env X402_MCP_BRIDGE_CHANNELS_DIR=... --env RPC_URL_8453=... -- npx -y @three-ws/mcp-bridge
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