# Darkly Energized – Bank of Japan Total Assets (USD)

> Darkly Energized – Bank of Japan Total Assets (USD) 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 a time series of Bank of Japan total assets converted to USD, with optional date filtering and statistical summaries.

## Facts

- Endpoint: GET https://darklyenergized.com/api/v1/x402/series/cb_usd_jpnassets?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/darkly-energized-bank-of-japan-total-assets-usd-b59cfb02
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HaQ-6kpn0zfWreucJP5us

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 darkly-energized-bank-of-japan-total-assets-usd-b59cfb02
```

Example prompt: Pull the Bank of Japan total assets series in USD from Darkly Energized for the last 5 years — show me up to 500 data points starting from 2020-01-01 through 2025-01-01.

## When to prefer this

Choose this endpoint when you need Bank of Japan balance sheet data specifically expressed in USD for cross-currency comparison with other central banks. It is ideal for macro analysts, global liquidity trackers, or quantitative researchers who need BoJ asset data in a consistent USD denomination alongside sibling series for Fed, ECB, PBoC, and other major central banks available on the same platform.

## Known failure modes

- Invalid date format (non-YYYY-MM-DD) returns a 400 error
- 'from' date after 'to' date returns empty or error response
- limit exceeding 10000 returns a validation error
- Payment not made or x402 payment header missing returns a 402 Payment Required response
- Date range with no available data returns an empty data array
- Stale data if the underlying BoJ source has not updated recently

## How this service works

Bank of Japan Total Assets (USD) ($0.05): Bank of Japan total assets converted to USD.

## Output

Returns a JSON object containing the time series data array (each item with a date and USD asset value), plus metadata including the series name, description, category, frequency, unit, data range covered, freshness status (isStale, lastObservation), and pagination info for large result sets. If the summary flag is set, returns statistical aggregates instead of raw data points.

## 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/darkly-energized-bank-of-japan-total-assets-usd-b59cfb02/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)