177 crypto market intel endpoints with auto x402 USDC micropayments from your AI agent
Connect Runs on your machine
claude mcp add x402-mcp -e EVM_PRIVATE_KEY=<EVM_PRIVATE_KEY> -e SVM_PRIVATE_KEY=<SVM_PRIVATE_KEY> -e X402_TOOL_LIMIT=<X402_TOOL_LIMIT> -- npx -y @carbon-cashmere/[email protected]{
"mcpServers": {
"x402-mcp": {
"command": "npx",
"args": [
"-y",
"@carbon-cashmere/[email protected]"
],
"env": {
"EVM_PRIVATE_KEY": "<EVM_PRIVATE_KEY>",
"SVM_PRIVATE_KEY": "<SVM_PRIVATE_KEY>",
"X402_TOOL_LIMIT": "<X402_TOOL_LIMIT>"
}
}
}
}{
"mcpServers": {
"x402-mcp": {
"command": "npx",
"args": [
"-y",
"@carbon-cashmere/[email protected]"
],
"env": {
"EVM_PRIVATE_KEY": "<EVM_PRIVATE_KEY>",
"SVM_PRIVATE_KEY": "<SVM_PRIVATE_KEY>",
"X402_TOOL_LIMIT": "<X402_TOOL_LIMIT>"
}
}
}
}{
"servers": {
"x402-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@carbon-cashmere/[email protected]"
],
"env": {
"EVM_PRIVATE_KEY": "<EVM_PRIVATE_KEY>",
"SVM_PRIVATE_KEY": "<SVM_PRIVATE_KEY>",
"X402_TOOL_LIMIT": "<X402_TOOL_LIMIT>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
EVM_PRIVATE_KEYOptional, secret | 0x-hex private key for Base/Polygon/Arbitrum USDC payments (dedicated wallet) |
SVM_PRIVATE_KEYOptional, secret | base58 Solana keypair for Solana USDC payments (optional) |
X402_TOOL_LIMITOptional | Max tools exposed (1-177, default 100) |
Details
| Package | @carbon-cashmere/[email protected] (NPM, stdio) |
| First published | 20 May 2026 |
| Last updated | 20 May 2026 |
| Registry name | io.github.CarbonCashmere/x402-mcp |
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