Blackwall x402 Guardrail
Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.
Connector by blackwalltier.com · Domain verified by the MCP Registry
Chalk Labs
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Install
Works with Claude Code, VS Code, Cursor, Windsurf. Read the repository before you give any tool access to your data.
npx agentmarket install connector/blackwalltier-com-blackwall-x402-guardrail
Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.
Remote endpoint
https://mcp.blackwalltier.comRemote (HTTP)
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About
Reviews
Write a reviewNo reviews yet. Installed it? Reviews come from verified installers only. How reviews work
Permissions
What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.
- Tools
- 1 read · 0 write · 0 deleteRead-only
- Secrets
- None asked for
- Install scripts
- Nothing to install (hosted)
- Runs as
- Hosted (remote endpoint)
Tools by what they do 1
From the running server's own tool list (tools/list) on Oct 25, 2026.
Read 1 · Look things up without changing anything.
forecast_payment
Network hosts it talks to 1
mcp.blackwalltier.com· found in remote endpoint, install command
Tools (1)
As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].
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.
Signals
- Stars
- 0
- Forks
- 0
- Open issues
- 2
- Last commit
- Aug 25, 2026 (2 months ago)
- Last release
- Aug 25, 2026 (2 months ago)
From GitHub (fetched Oct 24, 2026).
Details
- Registry name
com.blackwalltier/blackwall-x402-guardrail- Version
- 0.1.2
- Auth
- Auth not stated
- License
- License unknown
- Website
- blackwalltier.com
- First seen
- Oct 24, 2026
- Last checked
- Oct 25, 2026
More from blackwalltier.com
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Press we've placed: Forbes · CoinDesk · Decrypt · Cointelegraph · The Block
Rahil Jain, Co-founder, Chalk Labs. Ex-Goldman Sachs engineer. You talk to the person who builds it.
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Cite this page
Blackwall x402 Guardrail MCP server. Agent Mart. https://agentmart.dev/connectors/blackwalltier-com-blackwall-x402-guardrail (last updated 2026-10-25)