blackwall-x402-guardrail
Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.
Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"blackwall-x402-guardrail": {
"url": "https://mcp.blackwalltier.com"
}
}
}Remote endpoints
https://mcp.blackwalltier.comstreamable-httpWhat it can do
Tool inventory
Tools (1)
⚪forecast_payment(counterparty, amount, asset, chain, payer, ...)
Pre-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.
Input Schema
{
"type": "object",
"properties": {
"counterparty": {
"type": "string",
"description": "recipient wallet from the 402"
},
"amount": {
"type": "string",
"description": "amount as a decimal string, e.g. \"0.09\""
},
"asset": {
"type": "string",
"description": "e.g. USDC"
},
"chain": {
"type": "string",
"description": "e.g. base"
},
"payer": {
"type": "string",
"description": "agent's EVM wallet (optional; binds settlement)"
},
"resource": {
"type": "string",
"description": "what's being paid for"
},
"agent_id": {
"type": "string",
"description": "caller DID/identity"
},
"context": {
"type": "object",
"description": "{quoted_price_history, expected_recipient}"
}
},
"required": [
"counterparty",
"amount",
"asset",
"chain"
]
}Community
Evidence