# AEML Gauge Strata – Statistical Stratum Projection

> AEML Gauge Strata – Statistical Stratum Projection is a paid API for AI agents from aeml-x402.zeabur.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns 5-year same-season historical stratum distribution, quantile bands, and current-value stratum placement for a given signal and entity

## Facts

- Endpoint: GET https://aeml-x402.zeabur.app/gauge/strata
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aeml-gauge-strata-statistical-stratum-projection-f881d204
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kPPmKCjg-uQI-d1TWMMAd

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 aeml-gauge-strata-statistical-stratum-projection-f881d204
```

Example prompt: For Bitcoin spot price (signal_id: crypto.spot, entity: btc), show me which historical seasonal stratum the current value falls into — I want the 5-year same-season stratum proportions and quantile bands so I can see if it's unusually high or low for this time of year.

## When to prefer this

Use this endpoint when you need seasonal statistical context for a signal — specifically, where the current value sits within its historical stratum distribution for the same season over the past 5 years. Prefer this over /gauge (full core) when you only need strata projection at lower cost ($0.03 vs full gauge price), and over /gauge/ruler when you want quantile-based stratum placement rather than official threshold distances. Best for backtestable, seasonal benchmarking of macro, crypto, hydrology, agriculture, or shipping signals.

## Known failure modes

- 422 Unprocessable Entity if the requested signal_id has no strata definition (not all signals have official stratum bands)
- Missing or invalid signal_id / entity parameters return an error
- Stale data: freshness field may be 'stale' for low-cadence official signals (monthly/quarterly/annual); data_age_hours may be frozen if collector is down
- record_hash null if hashing is unavailable for a projected endpoint; recommend /gauge/verify for full core hash
- Unknown entity or signal_id returns 404 or error; consult /gauge/catalog for valid combinations
- Payment failure (x402): call requires $0.03 USDC on Base; unsigned or underpaid requests rejected

## How this service works

Add-on, statistical strata: share of the last 5 years spent in each official band for this day-of-year, the percentile bands, and where the current reading falls. Backtestable, and stated as approximate. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

## Output

A JSON object containing: the strata object with 5-year same-season historical layer proportions, quantile breakpoints, and the current value's stratum placement; entity and signal identifiers; observed_at timestamp; provenance block with freshness, data lineage, and age; an offline-verifiable citation with Ed25519 signature and DID; and a record_hash for integrity verification. Includes a grade disclosure and scope statement clarifying this is observational, not predictive or advisory.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "signal_id",
      "entity"
     ],
     "properties": {
      "entity": {
       "type": "string",
       "examples": [
        "07010000"
       ],
       "description": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id=<signal_id> -> signals[0].entities[]"
      },
      "signal_id": {
       "type": "string",
       "examples": [
        "hydrology.river-level"
       ],
       "description": "required - signal id (genus.species); free list at GET /gauge/catalog (paged; ?all=1 for every line)"
      }
     },
     "additionalProperties": false
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "const": "json"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aeml-gauge-strata-statistical-stratum-projection-f881d204/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aeml-x402.zeabur.app](https://www.zero.xyz/host/aeml-x402.zeabur.app/llms.txt)