# Study Notes — Revision Delta Map

> Study Notes — Revision Delta Map is a paid API for AI agents from www.mahastrategies.com, paid per call via x402, $0.021296/call, status unknown (last checked 2026-10-28).

Compares two pinned study-note projections to identify changes in source, locator, claim-kind, and confidence-basis fields across revisions.

## Facts

- Endpoint: POST https://www.mahastrategies.com/api/v1/context/study-notes/revision-delta-map?utm_source=zero.xyz
- Price: $0.021296/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/study-notes-revision-delta-map-ff352e72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n4kZjtMKGqCwupyNXSfLf

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability study-notes-revision-delta-map-ff352e72 -d '<json body>'
```

Example prompt: Compare these two pinned study-note snapshots — the 'before' and 'after' — and give me a delta map showing which source, locator, claim-kind, or confidence-basis fields changed between the two revisions; treat the data as public and non-personal metadata only.

## When to prefer this

Choose this endpoint when you need a structured field-level diff of study-note projections across two pinned revisions, specifically tracking source, locator, claim-kind, and confidence-basis changes. Prefer it over general-purpose diff tools when working within the Maha Strategies study-notes domain with offline, non-personal metadata under the 24-hour result retention constraint. Use sibling endpoints (e.g. Study Notes — Duplicate Record Identities) if the goal is identity deduplication rather than revision comparison.

## Known failure modes

- Missing or malformed 'before'/'after' objects — request rejected with validation error
- nonpersonalMetadata not set to true — const constraint violation causes rejection
- Invalid dataClass value outside 'public' or 'synthetic' enum — schema validation failure
- Mismatched projection schemas between before/after snapshots — delta computation may error or return incomplete results
- Stale results beyond 24-hour retention window — results no longer retrievable

## How this service works

Compare pinned study-note projections for source, locator, claim-kind and confidence-basis changes. A changed declaration does not establish improved evidence or truth. Offline typed nonpersonal metadata only. Result retention: 24 hours; minimal receipt metadata: 90 days.

## Output

A structured delta map identifying field-level changes between the two pinned study-note projections, covering source, locator, claim-kind, and confidence-basis dimensions. Results are retained for 24 hours; minimal receipt metadata persists for 90 days. The map does not assert improved evidence or truth from any changed declarations.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "object"
  },
  "before": {
   "type": "object"
  },
  "dataClass": {
   "enum": [
    "public",
    "synthetic"
   ],
   "type": "string"
  },
  "nonpersonalMetadata": {
   "type": "boolean",
   "const": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/study-notes-revision-delta-map-ff352e72/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.mahastrategies.com](https://www.zero.xyz/host/www.mahastrategies.com/llms.txt)