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d21 signal_delta
x402
d21 signal_delta is a paid API for AI agents from draconic21-x402-api.onrender.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-27).
Returns a complete diff of the Daily Agent Signal since a specified date — all added, changed (with before/after field values), and removed records — against a stored archive baseline.
Price / call$0.05
Success—
StatusUnknown
How this service works
GO-TO PRODUCT: what changed in the Daily Agent Signal since a date you read: complete added, changed (fields plus before/after) and removed records, diffed against our stored archive. Body { since_date }. Free first: /v1/signal_delta/availability?since_date= (absent baseline is 422, no charge) and /v1/signal_delta/example.
Output
A structured diff object containing three categories: added records (new entries since the baseline date), changed records (modified entries with per-field before/after values), and removed records (entries no longer present) — all compared against the stored archive for the given since_date.
Example use cases
Weekly signal change review
“What changed in the Daily Agent Signal since 2025-06-09? Show me all new entries, dropped records, and any fields that were updated with the before and after values.”
Monitoring agent market shifts
“I last read the Daily Agent Signal on 2025-05-20 — pull me everything that's been added, removed, or modified since then so I can see how the market has shifted.”
Automated delta ingestion pipeline
“Give me the complete diff of the Daily Agent Signal since 2025-06-01 — I need the full set of added, changed, and removed records to sync my database.”
Technical details
Endpoint
POSThttps://draconic21-x402-api.onrender.com/v1/signal_delta?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a precise, field-level diff of the Daily Agent Signal since a known date — especially for incremental sync, change monitoring, or audit use cases. Prefer this over re-fetching the full signal snapshot when you already have a stored baseline date and want only what changed. Use /v1/signal_delta/availability first to confirm a baseline exists before paying.
Side effects
- 422 Unprocessable Entity if no stored baseline exists for the provided since_date (check /v1/signal_delta/availability?since_date= first, free of charge)
- Invalid date format (must be YYYY-MM-DD) returns a validation error
- Date too recent or too old may yield empty or unavailable baseline
- Payment failure (x402) blocks access to the paid endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| since_date | string | Stored baseline date in YYYY-MM-DD format; check free availability first. |
Tags
x402
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