Zero-dependency HTTP 402 fetch replacement for autonomous AI agents. EIP-3009 gasless USDC on Base. Buyer, seller, and MCP server.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add x402-trinity --env X402_PRIVATE_KEY='<X402_PRIVATE_KEY>' --env X402_MAX_PER_REQUEST='<X402_MAX_PER_REQUEST>' --env X402_TOTAL_BUDGET='<X402_TOTAL_BUDGET>' -- npx -y x402-trinity~/.codex/config.toml
[mcp_servers.x402-trinity]
command = "npx"
args = ["-y", "x402-trinity"]
env = { X402_PRIVATE_KEY = "<X402_PRIVATE_KEY>", X402_MAX_PER_REQUEST = "<X402_MAX_PER_REQUEST>", X402_TOTAL_BUDGET = "<X402_TOTAL_BUDGET>" }
# codex mcp add x402-trinity --env X402_PRIVATE_KEY='<X402_PRIVATE_KEY>' --env X402_MAX_PER_REQUEST='<X402_MAX_PER_REQUEST>' --env X402_TOTAL_BUDGET='<X402_TOTAL_BUDGET>' -- npx -y x402-trinity~/.cursor/mcp.json
{
"mcpServers": {
"x402-trinity": {
"command": "npx",
"args": [
"-y",
"x402-trinity"
],
"env": {
"X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
"X402_MAX_PER_REQUEST": "<X402_MAX_PER_REQUEST>",
"X402_TOTAL_BUDGET": "<X402_TOTAL_BUDGET>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"x402-trinity": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"x402-trinity"
],
"env": {
"X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
"X402_MAX_PER_REQUEST": "<X402_MAX_PER_REQUEST>",
"X402_TOTAL_BUDGET": "<X402_TOTAL_BUDGET>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"x402-trinity": {
"command": "npx",
"args": [
"-y",
"x402-trinity"
],
"env": {
"X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
"X402_MAX_PER_REQUEST": "<X402_MAX_PER_REQUEST>",
"X402_TOTAL_BUDGET": "<X402_TOTAL_BUDGET>"
}
}
}
}claude_desktop_config.json
{
"mcpServers": {
"x402-trinity": {
"command": "npx",
"args": [
"-y",
"x402-trinity"
],
"env": {
"X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
"X402_MAX_PER_REQUEST": "<X402_MAX_PER_REQUEST>",
"X402_TOTAL_BUDGET": "<X402_TOTAL_BUDGET>"
}
}
}
}.trae/mcp.json
{
"mcpServers": {
"x402-trinity": {
"command": "npx",
"args": [
"-y",
"x402-trinity"
],
"env": {
"X402_PRIVATE_KEY": "<X402_PRIVATE_KEY>",
"X402_MAX_PER_REQUEST": "<X402_MAX_PER_REQUEST>",
"X402_TOTAL_BUDGET": "<X402_TOTAL_BUDGET>"
}
}
}
}Environment variables
X402_PRIVATE_KEYX402_MAX_PER_REQUESTX402_TOTAL_BUDGET
Replace the placeholders with your own credentials and keep them out of version control.