อัตราแลกเปลี่ยนย้อนหลังและข้อมูลอนุกรมเวลา

$ curl -G "https://api.exchangerate.dev/v1/range" \
    -H "Authorization: Bearer exr_live_..." \
    --data-urlencode "base=USD" \
    --data-urlencode "symbols=EUR,GBP" \
    --data-urlencode "start_date=2026-06-10" \
    --data-urlencode "end_date=2026-06-13"

{
  "result": "success",
  "base": "USD",
  "start_date": "2026-06-10",
  "end_date": "2026-06-13",
  "data": [
    { "date": "2026-06-10", "rates": { "EUR": 0.86663, "GBP": 0.74727 },
      "source": "ecb_daily", "is_forward_filled": false },
    { "date": "2026-06-11", "rates": { "EUR": 0.86678, "GBP": 0.74829 },
      "source": "ecb_daily", "is_forward_filled": false },
    { "date": "2026-06-12", "rates": { "EUR": 0.86453, "GBP": 0.74613 },
      "source": "ecb_daily", "is_forward_filled": false }
  ],
  "has_more": false,
  "next_cursor": null
}

import requests

API = "https://api.exchangerate.dev/v1"
KEY = "exr_live_..."   # free key at https://exchangerate.dev/signup

params = {
    "base": "USD",
    "symbols": "EUR,GBP",
    "start_date": "2026-06-10",
    "end_date": "2026-06-13",
}

rows = []
while True:
    resp = requests.get(
        f"{API}/range",
        headers={"Authorization": f"Bearer {KEY}"},
        params=params,
        timeout=10,
    )
    resp.raise_for_status()
    data = resp.json()
    rows.extend(data["data"])
    if not data["has_more"]:
        break
    cursor = data.get("next_cursor")
    if not cursor or cursor <= params.get("cursor", ""):
        raise RuntimeError("Incomplete historical response")
    params["cursor"] = cursor

for row in rows:
    filled = row["is_forward_filled"]
    print(row["date"], row["rates"]["EUR"], row["rates"]["GBP"], "filled" if filled else "")

import pandas as pd

# rows contains every page from the loop above
df = pd.json_normalize(rows)
df["date"] = pd.to_datetime(df["date"])
df = df.set_index("date").sort_index()

# keep only rows that were actually published that day
df = df[~df["is_forward_filled"]]

print(df[["rates.EUR", "rates.GBP"]].tail())