util_x402_pay_to_match

SERVERDelx Mcp A2a SOURCEhttps://api.delx.ai/v1/mcp

Critical RISK CLASS

Category Financial

Parameters 22 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-davidmosiah-delx-mcp-a2a/util-x402-pay-to-match.md

WHAT IT DOES

What util_x402_pay_to_match does on Delx Mcp A2a

AI agents use util_x402_pay_to_match to commit financial operations through Delx Mcp A2a, usually the final step of a payment, billing, or trading workflow. A call moves real money.

Parameter	Type	Required	Description
`pay_to`	string	Yes	Pay To supplied to X402 Pay To Match; used only for this bounded calculation and processed in memory without retention.
`expected`	string	Yes	Expected supplied to X402 Pay To Match; used only for this bounded calculation and processed in memory without retention.

Parameters from the server's own tool schema.

RISK

Why util_x402_pay_to_match is rated Critical

util_x402_pay_to_match moves real money, and an autonomous agent will call it with the same confidence it calls a search tool. A misread instruction or an injected prompt is all it takes to drain an account or blow a budget.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs util_x402_pay_to_match safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Delx Mcp A2a, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For util_x402_pay_to_match, this is the rule to start with:

util_x402_pay_to_match Approval-gated

Any call to util_x402_pay_to_match is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "util_x402_pay_to_match": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Delx Mcp A2a, apply this rule, and every util_x402_pay_to_match call is checked against it from then on.

FAQ

Questions about util_x402_pay_to_match

What does the util_x402_pay_to_match tool do? +

X402 Pay To Match compares challenge pay-to address with an expected merchant address from bounded caller-supplied values without an external provider. Call X402 Pay To Match before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Pay To Match as versioned deterministic JSON. Limitation: Validates metadata only; it never settles payment, signs payloads, contacts a facilitator, refunds funds, or asserts on-chain truth. It is categorised as a Financial tool in the Delx Mcp A2a MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

What parameters does util_x402_pay_to_match accept? +

util_x402_pay_to_match accepts 2 parameters: pay_to, expected. Required: pay_to, expected. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on util_x402_pay_to_match? +

Register the Delx Mcp A2a MCP server in PolicyLayer and add a rule for util_x402_pay_to_match: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Delx Mcp A2a. Nothing to install.

What risk level is util_x402_pay_to_match? +

util_x402_pay_to_match is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit util_x402_pay_to_match? +

Yes. Add a rate_limit block to the util_x402_pay_to_match rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block util_x402_pay_to_match completely? +

Set action: deny in the PolicyLayer policy for util_x402_pay_to_match. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides util_x402_pay_to_match? +

util_x402_pay_to_match is provided by the Delx Mcp A2a MCP server (https://api.delx.ai/v1/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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