# Alloy Measurements - Revision Delta Map

> Alloy Measurements - Revision Delta Map is a paid API for AI agents from www.mahastrategies.com, paid per call via x402, $0.02132/call, status unknown (last checked 2026-10-20).

Compares two sets of alloy lot/method/composition-basis records by stable ID and returns a structured delta map of owner, subject, revision, content, and scope pin changes between a before and after snapshot.

## Facts

- Endpoint: POST https://www.mahastrategies.com/api/v1/compute/alloy-measurements/revision-delta-map?utm_source=zero.xyz
- Price: $0.02132/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/alloy-measurements-revision-delta-map-9c4842e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1H2lhdHQvWpeKIo7lLMJy

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 alloy-measurements-revision-delta-map-9c4842e4 -d '<json body>'
```

Example prompt: Compare these two sets of alloy lot records — the before list has IDs [A1, A2, A3] and the after list has [A1, A2, A3] — using public data class, and tell me everything that changed in terms of owner, subject, revision, content, and scope pins between the two snapshots.

## When to prefer this

Use this endpoint when you need a structured, field-level diff between two snapshots of alloy lot, method, or composition-basis records identified by stable IDs — particularly when auditing revision drift, ownership changes, or scope pin mutations. Prefer this over generic diffing tools when your data fits the alloy measurement schema with public or synthetic data class constraints and non-personal metadata requirements.

## Known failure modes

- Array exceeds 32 items — request rejected with validation error
- dataClass value not in ['public','synthetic'] — enum validation failure
- nonpersonalMetadata not set to true — const constraint violation
- Malformed or empty record entries in before/after arrays — partial or no delta returned
- Network or upstream timeout — no response or 5xx error

## How this service works

Enumerate owner, subject, revision, content and scope pin changes by stable record ID in two supplied revisions for alloy lot/method/composition-basis Supplied-record analysis, not independent certification. Full contract at the free describe URL.

## Output

A structured delta map keyed by stable record ID listing all detected changes between the before and after record sets, covering owner, subject, revision, content, and scope pin differences. Does not perform independent certification — output is a supplied-record analysis only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "array",
   "maxItems": 32,
   "minItems": 0
  },
  "before": {
   "type": "array",
   "maxItems": 32,
   "minItems": 0
  },
  "dataClass": {
   "enum": [
    "public",
    "synthetic"
   ],
   "type": "string"
  },
  "nonpersonalMetadata": {
   "type": "boolean",
   "const": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/alloy-measurements-revision-delta-map-9c4842e4/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)