util_x402_scheme_select

SERVERDelx Protocol — Agent Recovery & Continuity SOURCEhttps://api.delx.ai/v1/mcp?src=registry

Medium RISK CLASS

Category Write

Parameters 22 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-davidmosiah-delx-protocol/util-x402-scheme-select.md

WHAT IT DOES

What util_x402_scheme_select does on Delx Protocol — Agent Recovery & Continuity

AI agents use util_x402_scheme_select to create or update resources in Delx Protocol — Agent Recovery & Continuity, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Delx Protocol — Agent Recovery & Continuity environment.

Parameter	Type	Required	Description
`schemes`	array	Yes	Schemes supplied to X402 Scheme Select; used only for this bounded calculation and processed in memory without retention.
`supported_schemes`	array	Yes	Supported Schemes supplied to X402 Scheme Select; used only for this bounded calculation and processed in memory without retention.

Parameters from the server's own tool schema.

RISK

Why util_x402_scheme_select is rated Medium

An AI agent can call util_x402_scheme_select faster than any human can review: one bad instruction and it creates or modifies resources in Delx Protocol — Agent Recovery & Continuity by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs util_x402_scheme_select safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Delx Protocol — Agent Recovery & Continuity, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For util_x402_scheme_select, this is the rule to start with:

util_x402_scheme_select Rate-limited

util_x402_scheme_select stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "util_x402_scheme_select": {
      "limits": [
        {
          "counter": "util_x402_scheme_select_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Delx Protocol — Agent Recovery & Continuity, apply this rule, and every util_x402_scheme_select call is checked against it from then on.

FAQ

Questions about util_x402_scheme_select

What does the util_x402_scheme_select tool do? +

X402 Scheme Select selects the first buyer-supported payment scheme from challenge options from bounded caller-supplied values without an external provider. Call X402 Scheme Select 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 Scheme Select 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 Write tool in the Delx Protocol — Agent Recovery & Continuity MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does util_x402_scheme_select accept? +

util_x402_scheme_select accepts 2 parameters: schemes, supported_schemes. Required: schemes, supported_schemes. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on util_x402_scheme_select? +

Register the Delx Protocol — Agent Recovery & Continuity MCP server in PolicyLayer and add a rule for util_x402_scheme_select: 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 Protocol — Agent Recovery & Continuity. Nothing to install.

What risk level is util_x402_scheme_select? +

util_x402_scheme_select is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit util_x402_scheme_select? +

Yes. Add a rate_limit block to the util_x402_scheme_select 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_scheme_select completely? +

Set action: deny in the PolicyLayer policy for util_x402_scheme_select. 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_scheme_select? +

util_x402_scheme_select is provided by the Delx Protocol — Agent Recovery & Continuity MCP server (https://api.delx.ai/v1/mcp?src=registry). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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