PostV1InstancesCreateAssetTrustline

THE RISK

Critical Risk

Why PostV1InstancesCreateAssetTrustline needs a policy

Creating an asset trustline is a blockchain financial operation that configures an account to hold and transact a specific asset/token. On networks like Stellar, this is a prerequisite for receiving and sending stablecoins, making it a financial infrastructure action. Misuse could commit the account to holding unauthorized assets or enable unauthorized payment flows.

From the tool's definition Create Asset Trustline — establishes a trustline for a stablecoin asset on a blockchain, part of BlindPay's stablecoin payment infrastructure

Documented attack patterns abuse exactly the kind of access PostV1InstancesCreateAssetTrustline gives an agent:

POLICY

How to control PostV1InstancesCreateAssetTrustline

PolicyLayer is an MCP gateway — it sits between your AI agents and BlindPay MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for PostV1InstancesCreateAssetTrustline:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "PostV1InstancesCreateAssetTrustline": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to PostV1InstancesCreateAssetTrustline is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register BlindPay MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

Govern MCP payment tools → Approval gates, spend caps, and per-identity scopes on every refund, payout, and charge your agents make.
Critical-risk tools in BlindPay MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about PostV1InstancesCreateAssetTrustline

What does the PostV1InstancesCreateAssetTrustline tool do? +

Create Asset Trustline. It is categorised as a Financial tool in the BlindPay MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on PostV1InstancesCreateAssetTrustline? +

Register the BlindPay MCP Server MCP server in PolicyLayer and add a rule for PostV1InstancesCreateAssetTrustline: 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 BlindPay MCP Server. Nothing to install.

What risk level is PostV1InstancesCreateAssetTrustline? +

PostV1InstancesCreateAssetTrustline 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 PostV1InstancesCreateAssetTrustline? +

Yes. Add a rate_limit block to the PostV1InstancesCreateAssetTrustline 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 PostV1InstancesCreateAssetTrustline completely? +

Set action: deny in the PolicyLayer policy for PostV1InstancesCreateAssetTrustline. 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 PostV1InstancesCreateAssetTrustline? +

PostV1InstancesCreateAssetTrustline is provided by the BlindPay MCP Server MCP server (blindpaylabs/blindpay-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every BlindPay MCP Server tool call.

Start from BlindPay MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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