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Frame Ancestors Check
x402
Frame Ancestors Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates whether a CSP frame-ancestors directive header contains a required source, returning a deterministic pass/advisory finding as versioned JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
Frame Ancestors Check: Frame Ancestors Check checks whether a CSP frame-ancestors directive contains a required source from bounded caller-supplied values without an external provider. Call Frame Ancestors Check before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for Frame Ancestors Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party,…
Output
Returns versioned deterministic JSON containing: normalized web evidence (the parsed header and required source), the computed finding (whether the required source is present in the frame-ancestors directive), and an explicit pass or advisory status indicating compliance.
Example use cases
Pre-cache CSP compliance check
“Before I cache this web response, verify that its frame-ancestors header "frame-ancestors 'self' https://dashboard.myapp.com" actually includes 'https://dashboard.myapp.com' as a required source and give me a pass or advisory status.”
Redirect safety validation
“I'm about to redirect users to an embedded iframe page — can you check if the frame-ancestors value "frame-ancestors https://partner.com 'self'" contains 'https://partner.com' so I know it's safe to proceed?”
Agent pipeline web response audit
“My agent just fetched a web response with CSP header "frame-ancestors 'none'" — check whether 'https://myagent.io' is an allowed source in that frame-ancestors directive and tell me the finding so I can decide whether to retry.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/frame-ancestors-checkWhen to prefer
Choose this endpoint when you need a lightweight, deterministic, stateless check of a CSP frame-ancestors directive against a specific required source — especially in agent pipelines that must validate web responses before caching, redirecting, or retrying. Prefer this over manual string parsing when you need a versioned, auditable finding with explicit pass/advisory status rather than raw boolean logic.
Side effects
- Malformed or missing frame-ancestors header may yield an advisory/fail status rather than an error
- Required source string that doesn't match any listed source returns advisory status
- Header value exceeding 8192 characters may be rejected or truncated
- Non-CSP header strings passed as input may produce invalid parse results
- Payment failure via x402 results in request not being processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to Frame Ancestors Check; used only for this bounded calculation and processed in memory without retention. |
| required_source | string | Required Source supplied to Frame Ancestors Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"source": "'none'",
"present": true,
"sources": [
"'none'"
],
"directive": "frame-ancestors"
},
"schema": "delx/util-frame-ancestors-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "87d66a2da893969f3b55da12bea54f3990c499fe4d58ef57b180b13ceeb775b2",
"external_calls": 0
},
"operation": "web_reliability:frame_ancestors_check"
}
}Tags
x402
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