💴 Japan MoF FX Intervention Tracker — Yen Intervention Disclosures

Live structured feed of every Japanese Ministry of Finance yen intervention disclosure — every USD/JPY, EUR/JPY, GBP/JPY operation back to April 1991, including the 2022 and 2024 yen-defense episodes. The only programmatic source for the MoF FEIO (Foreign Exchange Intervention Operations) record on Apify Store.

When the yen breaks ¥160/USD and the MoF presses the button, the world's FX desks need to know within seconds — but the official disclosure is a Shift-JIS CSV buried three navigation clicks deep on mof.go.jp, half in Japanese, half in English, with imperial-calendar dates and amounts in 億円 (100-million-yen units). This actor delivers that data clean — Gregorian dates, JPY in millions, USD-equivalent estimated at the intervention-year reference rate, and a normalized intervention_type (sell_USD = yen defense, buy_USD = yen weakening).

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⚡ What you get

Every record is one MoF FX intervention disclosure (or quarterly summary when currency_pair_filter=all) with 16 normalized fields:

Field	Type	Example	Notes
report_date	ISO date	2024-04-29	Intervention day. Null on quarterly summary rows.
fiscal_year_jp	string	令和6年	Japanese imperial calendar fiscal year (Reiwa/Heisei).
currency_pair	string	USD-JPY	Normalized pair. QUARTERLY-SUMMARY for quarter-end roll-ups.
base_currency	string	USD	Foreign side of the pair.
quote_currency	string	JPY	Always JPY for MoF interventions.
amount_oku_yen_raw	number	59185.0	Original CSV unit: 100-million yen (億円).
amount_JPY_millions	number	5918500.0	Converted to millions of yen.
amount_USD_equivalent_at_intervention_rate	number	39087.6	Millions of USD at the year's reference USDJPY.
estimation_rate_USDJPY	number	151.41	The reference USDJPY used for the estimate.
intervention_type	string	sell_USD	sell_USD = MoF sold USD/bought JPY (yen defense); buy_USD = opposite.
description_en	string	the US dollar (sold) the Japanese yen (bought)	Original English description from MoF.
description_jp	string	米ドル売り・日本円買い	Original Japanese description.
is_quarterly_summary	boolean	false	True for quarter-end aggregate rows.
source_url	string	https://www.mof.go.jp/english/policy/international_policy/reference/feio/index.html	MoF English landing page.
source_url_jp	string	https://www.mof.go.jp/policy/international_policy/reference/feio/index.html	MoF Japanese landing page.
fetched_at	ISO datetime	2026-05-31T20:30:00+00:00	When this actor pulled the CSV.

The MoF historical CSV at foreign_exchange_intervention_operations.csv covers every recorded intervention since April 1991 (Heisei 3) — that's three+ decades of yen-defense history. Use intervention_only=true (default) to skip zero-month rows; switch to false to pull the full series including the long quiet stretches when MoF didn't act.

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🎯 Use cases

FX desk — real-time intervention monitoring. A JPY trader at a global macro fund watches the spot move ¥160.50 → ¥154.20 in 40 minutes. Was that MoF? Pull report_date matches against the last 72 hours; the MoF posts the daily-detail disclosure on the last business day of each month — so the existence of the action is confirmable in real-time via this feed plus the BoJ current-account anomaly. The amount confirms within four weeks.

Macro PM — yen-policy regime detection. Aggregate amount_JPY_millions by fiscal year. The 2022 cycle hit ¥9.19 trillion across three operations (¥2.84T Sep 22, ¥5.62T Oct 21, plus October mid-month follow-up). The 2024 cycle hit ¥15.55 trillion across April + July. When a new cycle starts, the size + cadence of the first operation tells you whether MoF is in "warning" mode (¥3-5T per shot) or "all-in" mode (¥7T+).

Hedge fund options desk — vol-curve build. Mark a structural USDJPY vol spike against historical intervention dates. The 2-week implied rises 200-400bp in the 5 trading days before each MoF action (the leak risk premium) and collapses 100-200bp in the 3 days after. Backtest with this feed + your vol-history database.

Sovereign-debt analyst — yen reserve drawdown. Each MoF yen-buying intervention draws down the FX reserves account at the BoJ. Cross-join this feed against the BoJ Foreign Reserve series — the delta tells you the marked-to-market vs. effective rate of the intervention and the remaining ammunition.

Quant — economic-surprise factor extension. Add intervention amount as an event-window factor to your USDJPY momentum model. The 5-day post-intervention return distribution is materially different from random news days (skew: positive for yen, kurtosis: elevated).

Compliance — central bank action tracking. A US bank's FX compliance team logs every official intervention worldwide. The MoF series is one of the four mandatory G10-currency feeds (SNB, RBA, BoJ/MoF, NB are the others).

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📊 Sample Output

Above: live sample output from a currency_pair_filter: "USD-JPY", intervention_only: true, max_records: 5 run — five most recent yen-defense interventions from the 2022 + 2024 cycles, with normalized JPY amounts, USD-equivalent estimates, and the original bilingual descriptions.

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🚀 How to use

Default smoke test (last year's interventions)

{
  "currency_pair_filter": "all",
  "intervention_only": true,
  "max_records": 100
}

Yen-defense focus (2022 → today, USD-JPY only)

{
  "currency_pair_filter": "USD-JPY",
  "date_from": "2022-01-01",
  "date_to": "2026-12-31",
  "intervention_only": true,
  "max_records": 50
}

Full historical series (1991 → today, all pairs, including quiet months)

{
  "currency_pair_filter": "all",
  "date_from": "1991-04-01",
  "date_to": "2026-12-31",
  "intervention_only": false,
  "max_records": 500
}

Python (apify-client)

from apify_client import ApifyClient

client = ApifyClient("YOUR_APIFY_TOKEN")
run = client.actor("nexgendata/japan-mof-fx-intervention-tracker").call(
    run_input={
        "currency_pair_filter": "USD-JPY",
        "date_from": "2022-01-01",
        "date_to": "2026-12-31",
        "intervention_only": True,
        "max_records": 20,
    }
)
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item["report_date"], item["intervention_type"], item["amount_JPY_millions"], "millions JPY")

cURL

curl -X POST "https://api.apify.com/v2/acts/nexgendata~japan-mof-fx-intervention-tracker/runs?token=YOUR_APIFY_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"currency_pair_filter":"USD-JPY","intervention_only":true,"max_records":10}'

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🇯🇵 日本語の説明

このアクターは、財務省が公表する「外国為替平衡操作の実施状況」（FEIO）データを構造化されたJSON形式で配信します。データソースは財務省の公式CSV（Shift-JIS形式）で、1991年4月（平成3年4月）以降のすべての為替介入記録を網羅しています。

主な用途:

• 為替トレーダー — 米ドル/円介入のリアルタイム監視
• マクロPM — 円政策レジームの検出（2022年・2024年介入サイクルの分析）
• ヘッジファンドオプションデスク — ボラティリティ曲線への介入イベントの織り込み
• 国債アナリスト — 外貨準備の取り崩し追跡
• クオンツ — エコノミックサプライズファクターへの介入イベント追加

入力パラメーター:

• currency_pair_filter: 通貨ペアフィルター（USD-JPY / EUR-JPY / GBP-JPY / all）。デフォルト all
• date_from / date_to: 期間指定（ISO 8601 形式 YYYY-MM-DD）
• intervention_only: ゼロ介入月を除外するか（デフォルト true）
• max_records: 最大レコード数（1〜500、デフォルト100）

出力スキーマ（介入レコードあたり16フィールド）: 報告日（report_date）、和暦の年度（fiscal_year_jp）、通貨ペア（currency_pair）、ベース通貨、決済通貨、原データの億円単位金額、百万円換算、当該年の参照USDJPYレートでのドル建て概算、介入タイプ（売買方向）、英文・和文の取引説明、四半期合計フラグ、ソースURL（英語版・日本語版）、取得日時。

法的根拠: 外国為替及び外国貿易法第7条に基づき、財務省は為替介入の実施額を月次・四半期で公表しています。本アクターはこの公開データを取得・整理するもので、追加の権利申請は不要です。

接続ポリシー: ユーザーエージェントはMoFオープンデータ慣行に則り Mozilla/5.0 (compatible; NexGenDataBot/1.0; +https://nexgendata.com/bot; contact: hello@thenextgennexus.com) を使用しています。連絡先: hello@thenextgennexus.com

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⚖️ Legal & data sources

• Source: Japan Ministry of Finance, Foreign Exchange Intervention Operations (FEIO).
  • English landing: https://www.mof.go.jp/english/policy/international_policy/reference/feio/index.html
  • Japanese landing: https://www.mof.go.jp/policy/international_policy/reference/feio/index.html
  • Historical CSV: foreign_exchange_intervention_operations.csv (Shift-JIS encoded, updated monthly).
• Disclosure mandate: Foreign Exchange and Foreign Trade Act (外国為替及び外国貿易法) §7 — transparency obligation for FX intervention.
• Cadence: Daily-detail amounts are published on the last business day of each month, covering the prior 28-31-day window. Quarterly summary rows are published with the final monthly release of each quarter.
• License: MoF open-data policy — public records, free to redistribute with attribution.
• User-Agent policy: Mozilla/5.0 (compatible; NexGenDataBot/1.0; +https://nexgendata.com/bot; contact: hello@thenextgennexus.com) per Japanese government open-data convention (MoF/FSA/NTA/INPIT explicitly invite identified crawlers).
• Rate limit: This actor fetches the historical CSV at most once per run (~43 KB). No rate-limit pressure on MoF infrastructure.

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❓ FAQ

Q: Why is the USD-equivalent an "estimate"? A: MoF discloses amounts in JPY only, not in the foreign currency. Daily intra-month effective rates aren't published; the only fully reliable conversion is the daily TTM fix at the BoJ — which we don't yet pull into this actor. We use the annual average USDJPY reference rate as a per-year estimate (e.g. 2022: 131.50, 2024: 151.41). For trading-precision USD amounts, recompute against your own daily fix.

Q: Are quarterly summary rows duplicates of the daily rows? A: Quarterly summary rows are roll-ups of the daily rows. By default (intervention_only=true with a specific currency_pair_filter), quarterly rows are skipped. Set currency_pair_filter=all to include them — useful for cross-checking that the daily rows sum to the official quarter total.

Q: Why do some rows have a null report_date? A: Quarterly summary rows don't have a single intervention date — they aggregate the full quarter. report_date is null for those; fiscal_year_jp still resolves the period.

Q: How does intervention_type work? A: MoF describes interventions as e.g. "the US dollar (sold), the Japanese yen (bought)". We classify by what was done to the foreign currency — so sell_USD means MoF sold USD and bought JPY (yen defense, the classic 2022 + 2024 mode). buy_USD would mean yen-weakening intervention, which Japan hasn't run since the early 2000s.

Q: What's the difference between this and the BoJ Foreign Reserve series? A: This feed shows the gross transaction. The BoJ reserve series shows the net portfolio impact (which includes mark-to-market on existing USD holdings, JGB-USD swap roll, and the intervention's cash leg). Both are needed for a full picture of yen-defense ammunition.

Q: Does the actor pull the daily-detail breakdown (which session, which counterparty)? A: The monthly disclosure only publishes the aggregate amount per intervention day and the currency pair. Counterparty and session-time breakdowns are not in the public MoF series — those would require BoJ supplementary statistics and a paid Bloomberg / Refinitiv feed.

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🔗 Related Actors

The macro-FX cluster on NexGenData (currently public on Apify Store):

• currency-exchange-rates — 150+ FX pairs (USD/JPY, JPY/KRW, EUR/JPY) for USD-equivalent recomputation and cross-rate analysis.
• treasury-yields-bonds — US Treasury yield curve, the other side of the USDJPY carry trade. (verify public before linking)
• tse-japan-stock-screener — Tokyo Stock Exchange equity screener for the equity-side response to yen-defense moves.
• japan-edinet-insider-filings — Japanese listed-company filings (EDINET) for the disclosure-cycle context around MoF actions.
• sec-form-13f-tracker-pro — institutional positioning data for JPY-exposed equities + the yen-carry-trade investor pool.

For Japanese fixed-income context, see the BoJ JGB-auction + macro-rates sibling actor (Wave 12 build, may be in private review).

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🏷️ About NexGenData

NexGenData builds programmatic feeds for niche disclosure data that institutional research teams pay $10K+/yr for via terminal subscriptions. Our Japan/Korea cluster covers the disclosure-velocity sources that don't have English-language equivalents on Apify Store: TDnet timely disclosures, EDINET filings, MoF FX intervention, BoJ macro stats, JPX short-balance, DART OpenDART, KIPO patents, and more.

Contact: hello@thenextgennexus.com · nexgendata.com