AI agents use PutV1InstancesReceiversById to create or update resources in BlindPay MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your BlindPay MCP Server environment.
This is a Write operation (reversible modification) rather than Destructive because it updates/modifies receiver data rather than deleting it. However, it carries high severity because misconfigured receivers in a payment system could redirect funds, alter payment terms, or disrupt critical payment operations.
From the tool's definition Tool name 'PutV1InstancesReceiversById' with description 'Update Receiver' indicates a PUT operation that modifies receiver records in the BlindPay payment infrastructure.
Documented attack patterns abuse exactly the kind of access PutV1InstancesReceiversById gives an agent:
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 PutV1InstancesReceiversById:
{
"version": "1",
"default": "deny",
"tools": {
"PutV1InstancesReceiversById": {
"limits": [
{
"counter": "putv1instancesreceiversbyid_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}PutV1InstancesReceiversById 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.
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Update Receiver. It is categorised as a Write tool in the BlindPay MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the BlindPay MCP Server MCP server in PolicyLayer and add a rule for PutV1InstancesReceiversById: 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.
PutV1InstancesReceiversById is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the PutV1InstancesReceiversById 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.
Set action: deny in the PolicyLayer policy for PutV1InstancesReceiversById. 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.
PutV1InstancesReceiversById 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.
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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81 BlindPay MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.