Open a payment intent for a tool call on a chosen rail. Returns intent_hash, amount in atomic + human form, payTo wallet on the selected chain, and expiry. Supported rails: base-usdc-x402, xrpl-xrp, xrpl-rlusd, base-eurc.
Part of the PaymentOracle — Verifiable Multi-Rail Payment Receipts server.
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AI agents call quote_payment to retrieve information from PaymentOracle — Verifiable Multi-Rail Payment Receipts 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.
Even though quote_payment 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.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"quote_payment": {}
}
}See the full PaymentOracle — Verifiable Multi-Rail Payment Receipts policy for all 6 tools.
These attack patterns abuse exactly the kind of access quote_payment gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Open a payment intent for a tool call on a chosen rail. Returns intent_hash, amount in atomic + human form, payTo wallet on the selected chain, and expiry. Supported rails: base-usdc-x402, xrpl-xrp, xrpl-rlusd, base-eurc.. It is categorised as a Read tool in the PaymentOracle — Verifiable Multi-Rail Payment Receipts MCP Server, which means it retrieves data without modifying state.
Register the PaymentOracle — Verifiable Multi-Rail Payment Receipts MCP server in PolicyLayer and add a rule for quote_payment: 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 PaymentOracle — Verifiable Multi-Rail Payment Receipts. Nothing to install.
quote_payment is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the quote_payment 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 quote_payment. 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.
quote_payment is provided by the PaymentOracle — Verifiable Multi-Rail Payment Receipts MCP server (https://tooloracle.io/payments/mcp/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 PaymentOracle — Verifiable Multi-Rail Payment Receipts tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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