Generate QR codes for payment address and/or payment URI from an existing payment. USE THIS WHEN: User wants QR in different size/style than original, User wants only address QR or only payment URI QR (not both), User created payment without QR (include_qr=false) and now needs it, User wants QR f...
AI agents use generate_payment_qr to create or update resources in Sperax Ecosystem Crypto & DeFI MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sperax Ecosystem Crypto & DeFI MCP Server environment.
This tool creates artifacts (QR codes) associated with payments in a financial/DeFi context. Although QR code generation is reversible and doesn't directly move funds, it modifies or extends the representation of payment data. It falls under Write rather than Read because it generates new outputs beyond simple retrieval, and below Execute/Destructive because code execution and irreversible actions are not involved.
From the tool's definition Tool generates QR codes for payment addresses and payment URIs. While QR code generation itself is non-destructive, the context of a DeFi payment tool combined with the ability to create payment-related QR codes means this could facilitate or modify payment…
Documented attack patterns abuse exactly the kind of access generate_payment_qr gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_payment_qr:
{
"version": "1",
"default": "deny",
"tools": {
"generate_payment_qr": {
"limits": [
{
"counter": "generate_payment_qr_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_payment_qr 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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Generate QR codes for payment address and/or payment URI from an existing payment. USE THIS WHEN: User wants QR in different size/style than original, User wants only address QR or only payment URI QR (not both), User created payment without QR (include_qr=false) and now needs it, User wants QR for gateway URL (for redirect payments). EXAMPLES:. It is categorised as a Write tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for generate_payment_qr: 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.
generate_payment_qr 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 generate_payment_qr 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 generate_payment_qr. 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.
generate_payment_qr is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Sperax Ecosystem Crypto & DeFI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.