theprotocol_verifyPayment
Verify an A2A payment token before doing paid work. Returns validity + amount + caller_did + target_agent_did. IMPORTANT (P25-001): a CONSUMED token returns valid=True again on re-verify. Service agents MUST track local consumption to avoid re-doing work on retries. Requires agent JWT (any agent ...
This record as markdown: /tools/cloud-theprotocol-registry/theprotocol-verifypayment.md
What theprotocol_verifyPayment does on TheProtocol — Sovereign AI Agent Platform
AI agents call theprotocol_verifyPayment to retrieve information from TheProtocol — Sovereign AI Agent Platform without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
token | string | Yes | The apt_ payment token to verify |
agent_jwt | string | — | Optional inline agent JWT |
expected_target_did | string | — | Optional: expected target DID for extra check |
Parameters from the server's own tool schema.
Why theprotocol_verifyPayment is rated Low
Although this tool operates on financial data (payment tokens), it performs a read-only verification query without moving money or committing financial obligations. The critical security note (P25-001) warns that consumed tokens re-verify as valid, but the tool itself is a passive check—it does not execute the payment or irreversibly consume the token.
From the tool's definition Tool name 'verifyPayment' and description 'Verify an A2A payment token' indicates it queries/retrieves payment token state (validity, amount, caller_did, target_agent_did) without modifying it.
Risk signalsHandles credentials or secrets (token)
Attacks that exploit this kind of access
The rule that runs theprotocol_verifyPayment safely
PolicyLayer is an MCP gateway: it sits between your AI agents and TheProtocol — Sovereign AI Agent Platform, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For theprotocol_verifyPayment, this is the rule to start with:
theprotocol_verifyPayment is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect TheProtocol — Sovereign AI Agent Platform, apply this rule, and every theprotocol_verifyPayment call is checked against it from then on.
Questions about theprotocol_verifyPayment
Verify an A2A payment token before doing paid work. Returns validity + amount + caller_did + target_agent_did. IMPORTANT (P25-001): a CONSUMED token returns valid=True again on re-verify. Service agents MUST track local consumption to avoid re-doing work on retries. Requires agent JWT (any agent — token is self-authenticating). It is categorised as a Read tool in the TheProtocol — Sovereign AI Agent Platform MCP Server, which means it retrieves data without modifying state.
theprotocol_verifyPayment accepts 3 parameters: token, agent_jwt, expected_target_did. Required: token. The full parameter table on this page comes from the server's own tool schema.
Register the TheProtocol — Sovereign AI Agent Platform MCP server in PolicyLayer and add a rule for theprotocol_verifyPayment: 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 TheProtocol — Sovereign AI Agent Platform. Nothing to install.
theprotocol_verifyPayment 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 theprotocol_verifyPayment 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 theprotocol_verifyPayment. 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.
theprotocol_verifyPayment is provided by the TheProtocol — Sovereign AI Agent Platform MCP server (https://api.theprotocol.cloud/mcp/sse). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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