Issue an ES256K-signed receipt for a verified payment. Same signing key (tooloracle-paymentoracle-es256k-1) for all four rails. Idempotent: calling twice with the same verification_id returns the byte-identical receipt.
Part of the PaymentOracle — Verifiable Multi-Rail Payment Receipts server.
Free to start. No card required.
AI agents use issue_receipt to create or modify resources in PaymentOracle — Verifiable Multi-Rail Payment Receipts. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call issue_receipt repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach PaymentOracle — Verifiable Multi-Rail Payment Receipts.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"issue_receipt": {
"limits": [
{
"counter": "issue_receipt_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full PaymentOracle — Verifiable Multi-Rail Payment Receipts policy for all 6 tools.
These attack patterns abuse exactly the kind of access issue_receipt gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Issue an ES256K-signed receipt for a verified payment. Same signing key (tooloracle-paymentoracle-es256k-1) for all four rails. Idempotent: calling twice with the same verification_id returns the byte-identical receipt.. It is categorised as a Write tool in the PaymentOracle — Verifiable Multi-Rail Payment Receipts MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the PaymentOracle — Verifiable Multi-Rail Payment Receipts MCP server in PolicyLayer and add a rule for issue_receipt: 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.
issue_receipt 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 issue_receipt 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 issue_receipt. 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.
issue_receipt 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.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.