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URL Query Param Diff
x402
URL Query Param Diff is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Compares two URLs and returns added, removed, and changed query parameters between them as deterministic JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
URL Query Param Diff: URL Query Param Diff finds added, removed, and changed query parameters between URLs from bounded caller-supplied values without an external provider. Call URL Query Param Diff 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 URL Query Param Diff as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, me…
Output
Returns versioned deterministic JSON containing: the normalized before and after URLs as web evidence, a computed finding listing added, removed, and changed query parameters with their values, and an explicit pass or advisory status indicating whether differences were detected.
Example use cases
Redirect URL tamper detection
“Before accepting this OAuth redirect, can you compare the original authorization URL 'https://auth.example.com/authorize?client_id=123&scope=read&state=abc' against the callback 'https://auth.example.com/authorize?client_id=123&scope=read&state=abc&admin=true' and tell me if any query params were added or changed?”
Cache invalidation parameter check
“I'm about to serve a cached response — can you diff the query params between the cached URL 'https://api.service.com/data?user=42&page=1&v=2' and the incoming request URL 'https://api.service.com/data?user=42&page=2&v=2' so I know if they're equivalent or if something changed?”
Webhook retry URL validation
“Before retrying this failed webhook delivery, can you check what query parameters differ between the original URL 'https://hooks.myapp.com/events?token=abc&ts=1000&retry=false' and the new one 'https://hooks.myapp.com/events?token=abc&ts=2000&retry=true' to confirm the only changes are timestamp and retry flag?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/url-query-param-diffWhen to prefer
Choose this endpoint when you need a stateless, deterministic, zero-retention comparison of query parameters between two URLs — especially before accepting, caching, redirecting, or retrying a caller-supplied web response. Prefer it over manual string parsing when you need a structured, versioned JSON result with explicit pass/advisory status for downstream decision-making, and when you cannot rely on external dependencies or state.
Side effects
- Malformed or unparseable URL input returns an error or advisory status
- URLs exceeding 8192 characters are rejected
- Missing before_url or after_url fields result in a validation error
- URLs with no query parameters produce an empty diff with pass status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| after_url | string | After URL supplied to URL Query Param Diff; used only for this bounded calculation and processed in memory without retention. |
| before_url | string | Before URL supplied to URL Query Param Diff; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"added": {
"c": "3"
},
"changed": {
"a": {
"after": "2",
"before": "1"
}
},
"removed": {
"b": "2"
}
},
"schema": "delx/util-url-query-param-diff/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "3515f5558fb69829367b6de74545ae835dc31d8214a47050a271c62c654bddfe",
"external_calls": 0
},
"operation": "web_reliability:url_query_param_diff"
}
}Tags
x402
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