Pay-per-use

View translation pricing (1 credit per word)

Part of the Mcp Client MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

// WHEN AI AGENTS USE THIS TOOL

AI agents call Pay-per-use to retrieve information from Mcp Client without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.

// WHY ENFORCE A POLICY ON PAY-PER-USE

Even though Pay-per-use only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.

// RECOMMENDED POLICY

Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.

i18n-agent.yaml

tools:
  Pay-per-use:
    rules:
      - action: allow

See the full Mcp Client policy for all 12 tools.

// DETAILS

Tool Name Pay-per-use

Category Read

MCP Server Mcp Client MCP Server

Risk Level Low

// MORE MCP CLIENT TOOLS

Read en-AU Read en-CA Read en-GB Read en-US Read es-MX Read fr-CA Read pt-BR Read Trade-off

View all 12 tools →

// WHAT CAN GO WRONG

Agents calling read-class tools like Pay-per-use have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER READ TOOLS ACROSS MCP SERVERS

Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.

Open Library MCP Server get_author_info Open Library MCP Server get_author_photo Open Library MCP Server get_authors_by_name Open Library MCP Server get_book_by_id Open Library MCP Server get_book_by_title Open Library MCP Server get_book_cover

// RELATED READING

// FAQ

What does the Pay-per-use tool do? +

View translation pricing (1 credit per word). It is categorised as a Read tool in the Mcp Client MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on Pay-per-use? +

Add a rule in your Intercept YAML policy under the tools section for Pay-per-use. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Mcp Client MCP server.

What risk level is Pay-per-use? +

Pay-per-use is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit Pay-per-use? +

Yes. Add a rate_limit block to the Pay-per-use rule in your Intercept 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 Pay-per-use completely? +

Set action: deny in the Intercept policy for Pay-per-use. 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 Pay-per-use? +

Pay-per-use is provided by the Mcp Client MCP server (@i18n-agent/mcp-client). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Pay-per-use

Enforce policies on Mcp Client