# Accelerometer Snapshot by Date

> Accelerometer Snapshot by Date is a paid API for AI agents from x402-accelerometer-feed.fly.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-19).

Retrieves a specific historical dated snapshot of 129 AI-progress and technology time series including benchmark scores, compute trends, AGI prediction markets, model pricing, AI stocks, energy, space, robotics, and research output.

## Facts

- Endpoint: GET https://x402-accelerometer-feed.fly.dev/snapshots/:id
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/accelerometer-snapshot-by-date-a169c016
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EDE8CuQuQ0eT45-4rg6Nq

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 accelerometer-snapshot-by-date-a169c016
```

Example prompt: Pull the Accelerometer snapshot for 2024-11-15 so I can see the frontier benchmark scores, compute trends, and AGI prediction-market odds from that specific date.

## When to prefer this

Use this endpoint when you need data from a specific historical date rather than the current latest snapshot. Prefer this over /feed when performing date-specific analysis or building a custom comparison between two dates manually. Use /delta instead if you want the system to compute the difference between two snapshots automatically. This endpoint is ideal for time-travel queries, historical audits, or populating a timeline of AI progress metrics.

## Known failure modes

- 404 if the snapshot ID (date) does not exist in the registry — valid IDs are listed at GET /
- Malformed date format in path parameter causes request failure
- Network or payment processing failure returns non-200 response
- Stub snapshots may have incomplete source arrays

## How this service works

A specific dated snapshot (YYYY-MM-DD, ids listed free at /) of the 129-series AI-progress and technology pull: frontier benchmark scores, compute trends, AGI prediction-market odds, model pricing, AI stocks, energy, space, robotics, research output. Same per-source shape as /feed (latest, previous, % change, source URL). Use it to compare dates yourself, or call /delta to get the comparison computed. No composite score. Unknown id -> 404.

## Output

Returns a structured snapshot object containing schema version, snapshot ID (YYYY-MM-DD), run timestamp, number of sources (up to 129), and an array of per-source records. Each source record includes metric name, domain, unit, latest value, latest date, previous value, previous date, percent change vs previous, signal quality (strong/moderate/weak/noisy), confidence, cadence, number of data points, and source URL. No composite cross-source score is provided. Returns 404 if the snapshot ID is not found.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "id"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "reading date YYYY-MM-DD, from GET /"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "schema_version",
      "snapshot_id",
      "run_at",
      "n_sources",
      "sources"
     ],
     "properties": {
      "stub": {
       "type": "boolean"
      },
      "run_at": {
       "type": "string",
       "description": "ISO timestamp the pull ran"
      },
      "domains": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "sources": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "id",
         "metric",
         "domain",
         "unit",
         "latest",
         "latest_date"
        ],
        "properties": {
         "id": {
          "type": "string",
          "description": "registry key, e.g. epoch.training_flop_max"
         },
         "url": {
          "type": [
           "string",
           "null"
          ]
         },
         "unit": {
          "type": "string"
         },
         "access": {
          "type": [
           "string",
           "null"
          ]
         },
         "domain": {
          "type": "string"
         },
         "latest": {
          "type": "number"
         },
         "metric": {
          "type": "string"
         },
         "cadence": {
          "type": [
           "string",
           "null"
          ]
         },
         "n_points": {
          "type": "integer"
         },
         "previous": {
          "type": [
           "number",
           "null"
          ]
         },
         "confidence": {
          "type": "string"
         },
         "first_date": {
          "type": "string"

… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/accelerometer-snapshot-by-date-a169c016/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-accelerometer-feed.fly.dev](https://www.zero.xyz/host/x402-accelerometer-feed.fly.dev/llms.txt)