Pay any x402 endpoint on the open web: auto-paying bridge with Bazaar discovery and spend caps.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add x402-universal-payer --env MCP_BRIDGE_EVM_PRIVATE_KEY='<MCP_BRIDGE_EVM_PRIVATE_KEY>' --env MCP_BRIDGE_SVM_PRIVATE_KEY='<MCP_BRIDGE_SVM_PRIVATE_KEY>' -- npx -y @three-ws/mcp-bridge~/.codex/config.toml
[mcp_servers.x402-universal-payer]
command = "npx"
args = ["-y", "@three-ws/mcp-bridge"]
env = { MCP_BRIDGE_EVM_PRIVATE_KEY = "<MCP_BRIDGE_EVM_PRIVATE_KEY>", MCP_BRIDGE_SVM_PRIVATE_KEY = "<MCP_BRIDGE_SVM_PRIVATE_KEY>" }
# codex mcp add x402-universal-payer --env MCP_BRIDGE_EVM_PRIVATE_KEY='<MCP_BRIDGE_EVM_PRIVATE_KEY>' --env MCP_BRIDGE_SVM_PRIVATE_KEY='<MCP_BRIDGE_SVM_PRIVATE_KEY>' -- npx -y @three-ws/mcp-bridge~/.cursor/mcp.json
{
"mcpServers": {
"x402-universal-payer": {
"command": "npx",
"args": [
"-y",
"@three-ws/mcp-bridge"
],
"env": {
"MCP_BRIDGE_EVM_PRIVATE_KEY": "<MCP_BRIDGE_EVM_PRIVATE_KEY>",
"MCP_BRIDGE_SVM_PRIVATE_KEY": "<MCP_BRIDGE_SVM_PRIVATE_KEY>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"x402-universal-payer": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@three-ws/mcp-bridge"
],
"env": {
"MCP_BRIDGE_EVM_PRIVATE_KEY": "<MCP_BRIDGE_EVM_PRIVATE_KEY>",
"MCP_BRIDGE_SVM_PRIVATE_KEY": "<MCP_BRIDGE_SVM_PRIVATE_KEY>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"x402-universal-payer": {
"command": "npx",
"args": [
"-y",
"@three-ws/mcp-bridge"
],
"env": {
"MCP_BRIDGE_EVM_PRIVATE_KEY": "<MCP_BRIDGE_EVM_PRIVATE_KEY>",
"MCP_BRIDGE_SVM_PRIVATE_KEY": "<MCP_BRIDGE_SVM_PRIVATE_KEY>"
}
}
}
}claude_desktop_config.json
{
"mcpServers": {
"x402-universal-payer": {
"command": "npx",
"args": [
"-y",
"@three-ws/mcp-bridge"
],
"env": {
"MCP_BRIDGE_EVM_PRIVATE_KEY": "<MCP_BRIDGE_EVM_PRIVATE_KEY>",
"MCP_BRIDGE_SVM_PRIVATE_KEY": "<MCP_BRIDGE_SVM_PRIVATE_KEY>"
}
}
}
}.trae/mcp.json
{
"mcpServers": {
"x402-universal-payer": {
"command": "npx",
"args": [
"-y",
"@three-ws/mcp-bridge"
],
"env": {
"MCP_BRIDGE_EVM_PRIVATE_KEY": "<MCP_BRIDGE_EVM_PRIVATE_KEY>",
"MCP_BRIDGE_SVM_PRIVATE_KEY": "<MCP_BRIDGE_SVM_PRIVATE_KEY>"
}
}
}
}Environment variables
MCP_BRIDGE_EVM_PRIVATE_KEYMCP_BRIDGE_SVM_PRIVATE_KEY
Replace the placeholders with your own credentials and keep them out of version control.