Finance & Crypto Hosted remote
blackwall-x402-guardrail
Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.
Install
Remote streamable-http
https://mcp.blackwalltier.comClient config (Claude Desktop, Cursor, Windsurf and most MCP clients)
{
"mcpServers": {
"com-blackwalltier-blackwall-x402-guardrail": {
"url": "https://mcp.blackwalltier.com"
}
}
}Source: official MCP Registry record · registry name com.blackwalltier/blackwall-x402-guardrail · published 2026-08-25 · updated 2026-08-25. Not an endorsement; review the code before connecting it to anything sensitive.