# Federal Reserve Total Assets (USD) — Darkly Energized

> Federal Reserve Total Assets (USD) — Darkly Energized is a paid API for AI agents from darklyenergized.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-29).

Returns historical and current Federal Reserve total assets (WALCL series) denominated in USD, with optional date filtering and statistical summaries.

## Facts

- Endpoint: GET https://darklyenergized.com/api/v1/x402/series/cb_usd_walcl?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/federal-reserve-total-assets-usd-darkly-energized-d0e6e030
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rLt2CKXaNFbfR9gAy-Vp-

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 federal-reserve-total-assets-usd-darkly-energized-d0e6e030
```

Example prompt: Pull the Federal Reserve total assets data from January 1, 2020 through December 31, 2024, returning up to 1000 data points so I can chart the balance sheet expansion and contraction over that period.

## When to prefer this

Choose this endpoint when you need programmatic, time-series access to Federal Reserve total assets (WALCL) denominated in USD, especially for macro analysis, global liquidity research, or dashboard integration. It is ideal for comparing Fed balance sheet data against other central banks (also available on the same platform) and when you need pagination, date-range filtering, or summary statistics in a single call. Prefer this over FRED directly when you want a paid-API abstraction with consistent output schema and staleness metadata.

## Known failure modes

- Invalid date format (non-YYYY-MM-DD) returns a validation error
- Requesting a date range with no available data returns an empty data array
- Limit exceeding 10000 returns a schema validation error
- Network or upstream data source unavailability may return a 5xx error
- Payment failure (insufficient USDC) results in a 402 Payment Required response blocking data access

## How this service works

Federal Reserve Total Assets (USD) ($0.05): Federal Reserve total assets in USD.

## Output

Returns a JSON object containing: a data array of {time, value} objects representing Federal Reserve total assets in USD on each observation date (oldest first), series metadata (id, name, description, category, frequency, unit), and a meta object with record count, date range, freshness indicators (isStale, lastObservation, frequency), and pagination cursor for fetching further pages.

## 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"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "to": {
       "type": "string",
       "format": "date",
       "description": "End date (YYYY-MM-DD)"
      },
      "from": {
       "type": "string",
       "format": "date",
       "description": "Start date (YYYY-MM-DD)"
      },
      "after": {
       "type": "string",
       "format": "date",
       "description": "Return points after this date (meta.pagination.cursor)"
      },
      "limit": {
       "type": "integer",
       "default": 500,
       "maximum": 10000,
       "minimum": 1,
       "description": "Most data points to return, oldest first"
      },
      "summary": {
       "type": "boolean",
       "default": false,
       "description": "Return a statistical summary instead of the data points"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "oneOf": [
      {
       "type": "object",
       "required": [
        "data",
        "meta"
       ],
       "properties": {
        "data": {
         "type": "object",
         "required": [
          "id",
          "name",
          "description",
          "category",
          "frequency",
          "data"
         ],
         "properties": {
          "id": {
           "type": "string"
          },
          "data": {
           "type": "array",
           "items": {
            "type": "object",
            "required": [
             "time",
             "value"
            ],
            "properties": {
             "time": {
              "type": "string",
              "format": "date",
              "example": "2026-02-14"
             },
             "value": {
              "type": [
               "number",
               "null"
              ],
              "example": 1.23,
              "description": "Null where the series has no value on that date (for example while a computed series warms up)."
             }
            }
           }
          
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/federal-reserve-total-assets-usd-darkly-energized-d0e6e030/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from darklyenergized.com](https://www.zero.xyz/host/darklyenergized.com/llms.txt)