MCP server

x402Shield Official

dev.x402shield/x402shield

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

Public demo: evaluate AI-agent payment authorization and approval policy. No signing, no settlement.

Working at last checkVerified publisher: x402shield.devAbout 854 tokens per request once connected5 tools

https://x402shield.dev/api/mcp

At a glance

Type: MCP server
Publisher: x402shield.dev (verified by the MCP Registry)
Status: Working at last check
Tools: 5
Token cost: About 854 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 25 Oct 2026, 20:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http x402shield https://x402shield.dev/api/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.x402shield]
url = "https://x402shield.dev/api/mcp"

Gemini CLI

{"mcpServers":{"x402shield":{"httpUrl":"https://x402shield.dev/api/mcp"}}}

Cursor

{"mcpServers":{"x402shield":{"url":"https://x402shield.dev/api/mcp"}}}

VS Code

{"servers":{"x402shield":{"type":"http","url":"https://x402shield.dev/api/mcp"}}}

Antigravity

agy mcp add x402shield https://x402shield.dev/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"x402shield","server_url":"https://x402shield.dev/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"x402shield","server_url":"https://x402shield.dev/api/mcp"}

x402shield_authorize_payment ~316 tokens
Check whether the demo AI agent is financially authorized to make a proposed payment, BEFORE any wallet or signer would be asked to execute it. Returns ALLOW, DENY or REQUIRE_APPROVAL with a reason. This tool does not execute or sign a payment, and it cannot approve its own REQUIRE_APPROVAL result -
x402shield_get_authorization ~129 tokens
Look up the recorded decision, reason and evidence references for a payment previously checked with x402shield_authorize_payment, by its transaction id.
x402shield_get_demo_policy ~129 tokens
Look up the authority ceilings configured for the x402Shield public demo agents (Research Agent, Ops Agent) on Base Sepolia TESTNET. Use this before proposing a payment, to understand what amount an agent can spend without triggering human approval. This tool does not execute or sign anything.
x402shield_get_evidence ~147 tokens
Get the fuller evidence trail behind a previously-decided payment: policy/delegation provenance, the delegation tree it was evaluated under, and approval state if any. Read-only; never exposes secrets or signing material.
x402shield_list_demo_transactions ~133 tokens
List the most recent payment authorization decisions recorded by this public demo (both from the web console and from MCP callers). Useful to see recent ALLOW/DENY/REQUIRE_APPROVAL activity.

Boundra — Payment Approval Gateway for AI Agents
Allow, ask, or veto — a policy decision point your agent consults before signing any payment
KushBitx AgentProof
Safety checks for AI agents paying on Base: free SpendGuard, paid x402 token risk and preflight.
OnChainDiligence
Payment evidence and policy preflight, plus paid sanctions and company Evidence Provider checks.
Agent Reserve Protocol Authorization Firewall
Advisory policy preflight for AI-agent spend requests; never executes payments or accesses wallets.
Policy Gate
Deterministic allow/require_approval/deny verdicts for agent actions, before they happen.
DropEngine x402 Agent Services
AI Agent Utility Layer for agent safety, web monitoring, crypto research and tool discovery.
Decide Policy Notaries
Fail-closed refund, cancellation, return, and trial checks for 100 US subscription vendors.
Contribution Exchange
Contribution Exchange MCP: domain discovery, policies, preflight, proposals, and signals.

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