Risk-check counterparties before an AI agent pays; pay x402 resources only after a verified allow
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add x402check --env X402CHECK_CREDIT_TOKEN='<X402CHECK_CREDIT_TOKEN>' --env X402CHECK_PAYER_KEY='<X402CHECK_PAYER_KEY>' -- npx -y @x402check/mcp~/.codex/config.toml
[mcp_servers.x402check]
command = "npx"
args = ["-y", "@x402check/mcp"]
env = { X402CHECK_CREDIT_TOKEN = "<X402CHECK_CREDIT_TOKEN>", X402CHECK_PAYER_KEY = "<X402CHECK_PAYER_KEY>" }
# codex mcp add x402check --env X402CHECK_CREDIT_TOKEN='<X402CHECK_CREDIT_TOKEN>' --env X402CHECK_PAYER_KEY='<X402CHECK_PAYER_KEY>' -- npx -y @x402check/mcp~/.cursor/mcp.json
{
"mcpServers": {
"x402check": {
"command": "npx",
"args": [
"-y",
"@x402check/mcp"
],
"env": {
"X402CHECK_CREDIT_TOKEN": "<X402CHECK_CREDIT_TOKEN>",
"X402CHECK_PAYER_KEY": "<X402CHECK_PAYER_KEY>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"x402check": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@x402check/mcp"
],
"env": {
"X402CHECK_CREDIT_TOKEN": "<X402CHECK_CREDIT_TOKEN>",
"X402CHECK_PAYER_KEY": "<X402CHECK_PAYER_KEY>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"x402check": {
"command": "npx",
"args": [
"-y",
"@x402check/mcp"
],
"env": {
"X402CHECK_CREDIT_TOKEN": "<X402CHECK_CREDIT_TOKEN>",
"X402CHECK_PAYER_KEY": "<X402CHECK_PAYER_KEY>"
}
}
}
}claude_desktop_config.json
{
"mcpServers": {
"x402check": {
"command": "npx",
"args": [
"-y",
"@x402check/mcp"
],
"env": {
"X402CHECK_CREDIT_TOKEN": "<X402CHECK_CREDIT_TOKEN>",
"X402CHECK_PAYER_KEY": "<X402CHECK_PAYER_KEY>"
}
}
}
}.trae/mcp.json
{
"mcpServers": {
"x402check": {
"command": "npx",
"args": [
"-y",
"@x402check/mcp"
],
"env": {
"X402CHECK_CREDIT_TOKEN": "<X402CHECK_CREDIT_TOKEN>",
"X402CHECK_PAYER_KEY": "<X402CHECK_PAYER_KEY>"
}
}
}
}Environment variables
X402CHECK_CREDIT_TOKENX402CHECK_PAYER_KEY
Replace the placeholders with your own credentials and keep them out of version control.