Create payment link/URL where customer chooses cryptocurrency. USE AS DEFAULT WHEN: User requests payment without specifying crypto. Customer clicks link and selects their preferred cryptocurrency from available options. RESULT: Returns a web_url that you share with your customer. EXAMPLES:
AI agents use create_payment_link to commit financial operations through Sperax Ecosystem Crypto & DeFI MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool commits financial obligations by creating payment mechanisms that direct customers toward cryptocurrency transactions. Even though the customer selects the cryptocurrency (not the AI agent), the tool creates the infrastructure for money movement. Misuse by an AI agent could result in customers being directed to pay for unintended goods/services, creating fraudulent or unauthorized charges.
From the tool's definition Tool name 'create_payment_link' combined with description stating it creates a URL 'where customer chooses cryptocurrency' and 'Returns a web_url that you share with your customer' indicates facilitation of financial transactions.
Documented attack patterns abuse exactly the kind of access create_payment_link 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 create_payment_link:
{
"version": "1",
"default": "deny",
"tools": {
"create_payment_link": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}Any call to create_payment_link is blocked until a human approves it. The rest of the server keeps working.
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Create payment link/URL where customer chooses cryptocurrency. USE AS DEFAULT WHEN: User requests payment without specifying crypto. Customer clicks link and selects their preferred cryptocurrency from available options. RESULT: Returns a web_url that you share with your customer. EXAMPLES:. It is categorised as a Financial tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for create_payment_link: 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.
create_payment_link is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the create_payment_link 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 create_payment_link. 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.
create_payment_link 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.
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1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.