# Bank of Japan Interest Rate Series (agentfeeds.jp)

> Bank of Japan Interest Rate Series (agentfeeds.jp) is a paid API for AI agents from api.agentfeeds.jp, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Fetches historical and current Bank of Japan interest rate time series — unsecured overnight call rate or basic discount/loan rate — from official BOJ data.

## Facts

- Endpoint: GET https://api.agentfeeds.jp/v1/boj/rates
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bank-of-japan-interest-rate-series-agentfeeds-jp-2a84a15d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ohXiSXYQlk_lm17-CJh_0

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 bank-of-japan-interest-rate-series-agentfeeds-jp-2a84a15d
```

Example prompt: What's the Bank of Japan overnight call rate been doing over the last 24 months? Pull the call_rate_on series starting from January 2023 — I want to see the full monthly history.

## When to prefer this

Use this endpoint when you need official Bank of Japan interest rate data — specifically the unsecured overnight call rate (BOJ policy rate proxy, daily since 1998) or the basic discount/loan rate (公定歩合, daily since 1882) — directly from BOJ published figures. Prefer this over scraping BOJ's website or using general financial data APIs when you need clean, structured, machine-readable Japanese central bank rate data with a defined cost per call.

## Known failure modes

- Invalid series enum value returns a validation error
- Start/end period in wrong format (not YYYYMM) returns a bad request error
- Limit outside 1-2000 range returns a validation error
- Payment not completed (x402 protocol) returns a 402 Payment Required response
- No data available for the requested date range returns an empty observations array

## How this service works

Historical and current Japanese interest-rate series from the Bank of Japan's official Time-Series Data Search Site: the unsecured overnight call rate (proxy for the BOJ policy rate operating target, daily since 1998) and the basic discount/loan rate (formerly 公定歩合, daily since 1882). Factual published data only; not investment advice or a rate forecast.

## Output

An array of dated observations for the requested BOJ rate series (call_rate_on or discount_rate), each with a period timestamp and rate value, filtered to the requested date range and limited to the specified number of rows (default 100 most recent).

## 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",
     "required": [
      "series"
     ],
     "properties": {
      "end": {
       "type": "string",
       "description": "optional end period, YYYYMM"
      },
      "limit": {
       "type": "integer",
       "description": "1-2000, default 100 (most recent observations)"
      },
      "start": {
       "type": "string",
       "description": "optional start period, YYYYMM"
      },
      "series": {
       "enum": [
        "call_rate_on",
        "discount_rate"
       ],
       "type": "string",
       "description": "call_rate_on = unsecured overnight call rate (policy-rate proxy); discount_rate = basic discount/loan rate"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bank-of-japan-interest-rate-series-agentfeeds-jp-2a84a15d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentfeeds.jp](https://www.zero.xyz/host/api.agentfeeds.jp/llms.txt)