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TrialScope — Clinical Trial Change-Delta Lookup
x402
TrialScope — Clinical Trial Change-Delta Lookup is a paid API for AI agents from x402-trialscope.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-16).
Retrieves the field-level changes between a stored snapshot and the current ClinicalTrials.gov record for a specific trial, revealing what has changed since the snapshot was taken.
Price / call$0.02
Success—
StatusUnknown
How this service works
Per-call clinical trial search, study dossiers, and change-deltas from ClinicalTrials.gov. Paid per call via the x402 protocol (USDC); unpaid requests return HTTP 402 with payment terms in the PAYMENT-REQUIRED header. Terms of service: GET /terms (free).
Output
Returns a structured diff object showing field-level changes between the stored snapshot and the current ClinicalTrials.gov record for the specified NCT ID, including which fields were added, removed, or modified and their old vs. new values.
Example use cases
Track eligibility criteria changes
“Has anything changed in the eligibility criteria for clinical trial NCT04280705 since I took snapshot snap_abc123 last week? Show me the exact field differences.”
Monitor trial status updates
“Check if the enrollment status or phase for trial NCT03745183 has changed since snapshot snap_def456 — I need to know if it moved from recruiting to completed.”
Audit protocol amendments
“Pull the change-delta for NCT02678520 against snapshot snap_ghi789 so I can audit what protocol amendments were made since our last review.”
Technical details
Endpoint
GEThttps://x402-trialscope.onrender.com/delta?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you have a previously created snapshot (via POST /snapshot) and need to see exactly what changed in a specific trial record since that snapshot was taken. It is purpose-built for change-detection workflows on ClinicalTrials.gov data, unlike a fresh search or full dossier fetch. Use it when you need a diff, not a full record pull.
Side effects
- HTTP 402 returned if payment not provided via x402 protocol — caller must pay $0.02 USDC per call
- Invalid or expired snapshotId returns an error indicating the snapshot was not found
- Invalid nctId format returns a validation error
- NCT ID not present in the snapshot returns a mismatch error
- Network or upstream ClinicalTrials.gov API unavailability may cause 503 responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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