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Polygraph MCP/Agent Security Grading
x402
Polygraph MCP/Agent Security Grading is a paid API for AI agents from www.polygraph.so, paid per call via x402, $1/call, status unknown (last checked 2026-09-14).
Submits an MCP server, agent, or AI skill for independent A-to-F behavioral security grading backed by reproducible evidence
Price / call$1
Success—
StatusUnknown
How this service works
Independent A-to-F behavioral security grades for MCP servers, agents, and skills, backed by evidence anyone can re-run. Nobody can pay for a grade.
Output
Returns a JSON object confirming the grading job was created, with a unique requestId, a statusUrl to poll for results (the actual A-to-F grade and evidence), a deadlineAt timestamp indicating when grading will be complete, and flags for whether a charge was processed and whether the request was successfully created.
Example use cases
Vetting a third-party MCP server before adoption
“Before I integrate that new calendar MCP server into my workflow, can you run it through Polygraph and get me an independent security grade? I want to see the behavioral evidence before I trust it with my data.”
Auditing an in-house agent for compliance
“We're about to ship our customer-support agent to production — can you submit it to Polygraph for a behavioral security grade and send me the status URL so I can track the results?”
Comparing trust levels of competing AI skills
“I'm deciding between two AI skills for my pipeline. Can you kick off a Polygraph grading request for the 'summarizer-pro' skill so I can see its A-to-F security rating and evidence before I make a decision?”
Technical details
Endpoint
POSThttps://www.polygraph.so/api/x402/grade-requestWhen to prefer
Choose this endpoint when you need an independent, evidence-backed behavioral security grade for an MCP server, AI agent, or skill — especially when you cannot trust self-reported safety claims or vendor-provided audits. It is the right choice when compliance, risk management, or due diligence requires reproducible, third-party verification that no party can purchase or game. Prefer this over general vulnerability scanners or code auditors when the subject is an AI tool with behavioral (not just code-level) risks.
Side effects
- Payment failure — insufficient USDC balance causes the request to be rejected before grading begins
- Invalid target — if the MCP server or agent identifier cannot be resolved, the request may fail with a validation error
- Duplicate submission — submitting the same target may return an existing in-progress grade rather than creating a new one
- Timeout — grading is asynchronous; the deadline may pass without a completed grade if the target is unreachable
- Service unavailability — polygraph.so API downtime returns a non-200 response with no requestId
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Optional email notified when the grade publishes. | |
| source | string | Optional client name for attribution. |
| agent_id | string | Optional stable identifier for the requesting agent. |
| server_ref | string | Target to grade: npm ref (npm/@scope/name), github/owner/repo, pypi/name, or an https:// MCP URL. |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "grading",
"charged": false,
"created": true,
"requestId": "req_123",
"statusUrl": "https://www.polygraph.so/api/grade-requests/req_123/status",
"deadlineAt": "2026-07-18T12:00:00Z"
}
}Tags
x402
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