Blackwall X402 Guardrail
Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.
Connect it
Settings → Connectors → Add custom connector
URL: https://mcp.blackwalltier.comSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://mcp.blackwalltier.com{
"mcpServers": {
"blackwall-x402-guardrail": {
"url": "https://mcp.blackwalltier.com"
}
}
}claude mcp add --transport http blackwall-x402-guardrail https://mcp.blackwalltier.com{
"servers": {
"blackwall-x402-guardrail": {
"type": "http",
"url": "https://mcp.blackwalltier.com"
}
}
}1 tools, verified live
forecast_paymentPre-signature x402 payment verdict: GO / HOLD / STOP for paying a counterparty, from settlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC sanctions — with a third-party-verifiable Ed25519 signed receipt. Verdict only; never takes custody. Free under $10 at risk; over that, returns an x402 payment challenge.
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