Accounting infrastructure for autonomous spending — every x402 purchase an agent makes becomes a reconciled, auditable receipt. SDK, MCP server, examples.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add x402receipts --env X402RECEIPTS_EVM_PRIVATE_KEY='<X402RECEIPTS_EVM_PRIVATE_KEY>' --env X402RECEIPTS_SOLANA_PRIVATE_KEY='<X402RECEIPTS_SOLANA_PRIVATE_KEY>' -- npx -y x402receipts-mcp~/.codex/config.toml
[mcp_servers.x402receipts]
command = "npx"
args = ["-y", "x402receipts-mcp"]
env = { X402RECEIPTS_EVM_PRIVATE_KEY = "<X402RECEIPTS_EVM_PRIVATE_KEY>", X402RECEIPTS_SOLANA_PRIVATE_KEY = "<X402RECEIPTS_SOLANA_PRIVATE_KEY>" }
# codex mcp add x402receipts --env X402RECEIPTS_EVM_PRIVATE_KEY='<X402RECEIPTS_EVM_PRIVATE_KEY>' --env X402RECEIPTS_SOLANA_PRIVATE_KEY='<X402RECEIPTS_SOLANA_PRIVATE_KEY>' -- npx -y x402receipts-mcp~/.cursor/mcp.json
{
"mcpServers": {
"x402receipts": {
"command": "npx",
"args": [
"-y",
"x402receipts-mcp"
],
"env": {
"X402RECEIPTS_EVM_PRIVATE_KEY": "<X402RECEIPTS_EVM_PRIVATE_KEY>",
"X402RECEIPTS_SOLANA_PRIVATE_KEY": "<X402RECEIPTS_SOLANA_PRIVATE_KEY>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"x402receipts": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"x402receipts-mcp"
],
"env": {
"X402RECEIPTS_EVM_PRIVATE_KEY": "<X402RECEIPTS_EVM_PRIVATE_KEY>",
"X402RECEIPTS_SOLANA_PRIVATE_KEY": "<X402RECEIPTS_SOLANA_PRIVATE_KEY>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"x402receipts": {
"command": "npx",
"args": [
"-y",
"x402receipts-mcp"
],
"env": {
"X402RECEIPTS_EVM_PRIVATE_KEY": "<X402RECEIPTS_EVM_PRIVATE_KEY>",
"X402RECEIPTS_SOLANA_PRIVATE_KEY": "<X402RECEIPTS_SOLANA_PRIVATE_KEY>"
}
}
}
}claude_desktop_config.json
{
"mcpServers": {
"x402receipts": {
"command": "npx",
"args": [
"-y",
"x402receipts-mcp"
],
"env": {
"X402RECEIPTS_EVM_PRIVATE_KEY": "<X402RECEIPTS_EVM_PRIVATE_KEY>",
"X402RECEIPTS_SOLANA_PRIVATE_KEY": "<X402RECEIPTS_SOLANA_PRIVATE_KEY>"
}
}
}
}.trae/mcp.json
{
"mcpServers": {
"x402receipts": {
"command": "npx",
"args": [
"-y",
"x402receipts-mcp"
],
"env": {
"X402RECEIPTS_EVM_PRIVATE_KEY": "<X402RECEIPTS_EVM_PRIVATE_KEY>",
"X402RECEIPTS_SOLANA_PRIVATE_KEY": "<X402RECEIPTS_SOLANA_PRIVATE_KEY>"
}
}
}
}Environment variables
X402RECEIPTS_EVM_PRIVATE_KEYX402RECEIPTS_SOLANA_PRIVATE_KEY
Replace the placeholders with your own credentials and keep them out of version control.