Yes. The Free tier is 600 requests a month at 100 requests a minute, across every endpoint in the catalog, with no credit card. Nothing about it expires.

What happens when I hit the quota?

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A 5xx does not. If a source breaks on our side, the request is excluded from your monthly count. A 4xx does count — a wrong parameter is still a request we answered. Per-minute throttling counts everything, so a retry loop is still throttled.

Which tier do I need?

Start on Free. Every response carries the remaining quota in its headers, and the dashboard reads the same number enforcement uses, so you will see the ceiling coming rather than discovering it.

How is Zapi different from RapidAPI or Apify?

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One: zpi-sdk, for TypeScript and JavaScript. It carries a typed error hierarchy, retries only what is safe to retry, submits bulk jobs, and verifies webhook signatures. Everything else is plain REST — cURL or any HTTP client works.

Can I request a source that isn't in the catalog yet?

Yes, through the community Discord, on any tier.

Why are Pro and Ultra marked Soon?

Checkout is not open yet. The limits and features listed on those tiers are already built and enforced — what is pending is billing, not the product.

FRED

Federal Reserve Economic Data: macro series with point-in-time vintages, so a revised print never masquerades as the original.

Endpoints: 10
Requests: 315
Updated: 6 hours ago
For LLMs: llms.txt

Endpoint health3 hours ago

categorypassing, 0.8s
observations-vintagepassing, 0.6s
release-datespassing, 0.6s
releasespassing, 7.5s
series-observationspassing, 1.5s

+ 5 more endpoints

10/10 passingdaily 01:00 WIB

Playground

10 endpoints

GET/v1/finance:fred/category6h cache2 paramschecking key…

Parameters

Response

EXAMPLE

{
  "page": 1,
  "count": 50,
  "items": [
    {
      "url": "https://fred.stlouisfed.org/series/DGS10",
      "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis",
      "units": "Percent",
      "series": "DGS10",
      "frequency": "Daily",
      "observationEnd": "2026-08-18",
      "observationStart": "1962-01-02",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    },
    {
      "url": "https://fred.stlouisfed.org/series/GS10",
      "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis",
      "units": "Percent",
      "series": "GS10",
      "frequency": "Monthly",
      "observationEnd": "Jul 2026",
      "observationStart": "Apr 1953",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    },
    {
      "url": "https://fred.stlouisfed.org/series/WGS10YR",
      "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis",
      "units": "Percent",
      "series": "WGS10YR",
      "frequency": "Weekly",
      "observationEnd": "2026-08-14",
      "observationStart": "1962-01-05",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    }
  ],
  "total": null,
  "dataset": "category",
  "hasMore": true,
  "category": 115,
  "children": [
    {
      "name": "Money, Banking, & Finance",
      "categoryId": 32991
    },
    {
      "name": "Interest Rates",
      "categoryId": 22
    }
  ],
  "nextPage": 2,
  "provider": "fred"
}

Code examples

Full reference

10 endpoints · plain text

GETCategory/v1/finance:fred/categoryWalk the FRED category tree: child categories at a node, and the series that

Parameters

categorynumberoptional: FRED category id. Omit for the root of the tree.
pagenumberoptional: Page of the series listing (default 1)

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/category?category=115&page=1" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "page": 1,
  "count": 50,
  "items": [
    {
      "url": "https://fred.stlouisfed.org/series/DGS10",
      "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis",
      "units": "Percent",
      "series": "DGS10",
      "frequency": "Daily",
      "observationEnd": "2026-08-18",
      "observationStart": "1962-01-02",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    },
    {
      "url": "https://fred.stlouisfed.org/series/GS10",
      "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis",
      "units": "Percent",
      "series": "GS10",
      "frequency": "Monthly",
      "observationEnd": "Jul 2026",
      "observationStart": "Apr 1953",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    },
    {
      "url": "https://fred.stlouisfed.org/series/WGS10YR",
      "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis",
      "units": "Percent",
      "series": "WGS10YR",
      "frequency": "Weekly",
      "observationEnd": "2026-08-14",
      "observationStart": "1962-01-05",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    }
  ],
  "total": null,
  "dataset": "category",
  "hasMore": true,
  "category": 115,
  "children": [
    {
      "name": "Money, Banking, & Finance",
      "categoryId": 32991
    },
    {
      "name": "Interest Rates",
      "categoryId": 22
    }
  ],
  "nextPage": 2,
  "provider": "fred"
}

GETObservations Vintage/v1/finance:fred/observations-vintagePoint-in-time observations — what a series looked like on the day it was

Parameters

seriesstringoptional: FRED series ids, comma-separated. A missing observation comes back as null, never 0. Default GDP.
vintagesstringoptional: Vintage dates, comma-separated, YYYY-MM-DD. List them with the vintage-dates endpoint. Series times vintages must not exceed 12. Defaults to the latest vintage.
fromstringoptional: First observation date, YYYY-MM-DD.
tostringoptional: Last observation date, YYYY-MM-DD.
lengthnumberoptional: Observations to return, newest first (default 100, max 20000)

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/observations-vintage?series=GDP&vintages=2020-01-30%2C2020-04-29%2C2026-07-30&from=2019-07-01&to=2019-12-31&length=100" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "to": "2019-12-31",
  "from": "2019-07-01",
  "count": 2,
  "items": [
    {
      "date": "2019-10-01",
      "values": {
        "GDP": 21933.217
      }
    },
    {
      "date": "2019-07-01",
      "values": {
        "GDP": 21717.171
      }
    }
  ],
  "total": 2,
  "series": [
    "GDP"
  ],
  "columns": [
    {
      "key": "GDP",
      "column": "GDP_20260820",
      "series": "GDP"
    }
  ],
  "dataset": "observations-vintage",
  "missing": [],
  "provider": "fred",
  "vintages": []
}

GETRelease Dates/v1/finance:fred/release-datesThe US statistical release calendar — what is published on a given day, at what

Parameters

fromstringoptional: First calendar date, YYYY-MM-DD. Defaults to today.
tostringoptional: Last calendar date, YYYY-MM-DD. Defaults to from.
releasenumberoptional: Restrict to one release id, from the releases endpoint.
yearnumberoptional: Whole calendar year. Use with release; overrides from/to.
pagenumberoptional: Page of the calendar, 50 entries each (default 1)

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/release-dates?from=2026-08-17&to=2026-08-21&release=18&year=2026&page=1" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "to": "2026-08-21",
  "from": "2026-08-17",
  "page": 1,
  "year": 2026,
  "count": 50,
  "items": [
    {
      "url": "https://fred.stlouisfed.org/release?rid=18",
      "date": "2026-01-02",
      "name": "H.15 Selected Interest Rates",
      "time": "3:15 pm",
      "released": true,
      "releaseId": 18
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=18",
      "date": "2026-01-05",
      "name": "H.15 Selected Interest Rates",
      "time": "3:15 pm",
      "released": true,
      "releaseId": 18
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=18",
      "date": "2026-01-06",
      "name": "H.15 Selected Interest Rates",
      "time": "3:15 pm",
      "released": true,
      "releaseId": 18
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=18",
      "date": "2026-01-07",
      "name": "H.15 Selected Interest Rates",
      "time": "3:15 pm",
      "released": true,
      "releaseId": 18
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=18",
      "date": "2026-01-08",
      "name": "H.15 Selected Interest Rates",
      "time": "3:15 pm",
      "released": true,
      "releaseId": 18
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=18",
      "date": "2026-01-09",
      "name": "H.15 Selected Interest Rates",
      "time": "3:15 pm",
      "released": true,
      "releaseId": 18
    }
  ],
  "total": null,
  "dataset": "release-dates",
  "hasMore": true,
  "release": 18,
  "nextPage": 2,
  "provider": "fred"
}

GETReleases/v1/finance:fred/releasesThe release catalogue — every statistical publication FRED redistributes,

Parameters

pagenumberoptional: Catalogue page, 50 releases each (default 1)
querystringoptional: Keep only releases whose name contains this text.

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/releases?page=1&query=interest+rates" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "page": 1,
  "count": 4,
  "items": [
    {
      "url": "https://fred.stlouisfed.org/release?rid=131",
      "name": "G.13 Selected Interest Rates",
      "releaseId": 131
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=18",
      "name": "H.15 Selected Interest Rates",
      "releaseId": 18
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=484",
      "name": "Key ECB Interest Rates",
      "releaseId": 484
    },
    {
      "url": "https://fred.stlouisfed.org/release?rid=94",
      "name": "Survey of Secondary Market Prices and Yields, and Interest Rates for Home Loans",
      "releaseId": 94
    }
  ],
  "query": "interest rates",
  "total": null,
  "dataset": "releases",
  "hasMore": false,
  "nextPage": null,
  "provider": "fred"
}

GETSeries Observations/v1/finance:fred/series-observationsFRED observations — any economic series the St. Louis Fed publishes, by id.

Parameters

seriesstringoptional: FRED series ids, comma-separated, up to 12 — the upstream drops the 13th silently. A missing observation comes back as null, never 0. Default DGS10.
fromstringoptional: First observation date, YYYY-MM-DD. Applied to every series.
tostringoptional: Last observation date, YYYY-MM-DD. Applied to every series.
transformationenumoptional: Server-side transform: lin (level), chg, ch1, pch, pc1 (year-over-year %), pca, cch, cca, log. Default lin. Values: lin, chg, ch1, pch, pc1, pca, cch, cca, log.
frequencyenumoptional: Resample a higher-frequency series down to Daily, Weekly, Biweekly, Monthly, Quarterly, Semiannual or Annual. Values: Daily, Weekly, Biweekly, Monthly, Quarterly, Semiannual, Annual.
aggregationenumoptional: How frequency collapses each bucket: avg, sum or eop (end of period). Default avg. Values: avg, sum, eop.
lengthnumberoptional: Observations to return, newest first (default 100, max 20000)

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/series-observations?series=DGS10%2CDGS2%2CT10Y2Y&from=2026-01-01&to=2026-08-18&transformation=pc1&frequency=Monthly&aggregation=avg&length=100" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "to": "2026-08-01",
  "from": "2024-01-01",
  "count": 100,
  "items": [
    {
      "date": "2026-07-31",
      "values": {
        "DFII10": 2.47
      }
    },
    {
      "date": "2026-07-30",
      "values": {
        "DFII10": 2.41
      }
    },
    {
      "date": "2026-07-29",
      "values": {
        "DFII10": 2.41
      }
    },
    {
      "date": "2026-07-28",
      "values": {
        "DFII10": 2.41
      }
    },
    {
      "date": "2026-07-27",
      "values": {
        "DFII10": 2.44
      }
    },
    {
      "date": "2026-07-24",
      "values": {
        "DFII10": 2.43
      }
    }
  ],
  "total": 674,
  "series": [
    "DFII10"
  ],
  "dataset": "series-observations",
  "missing": [],
  "provider": "fred",
  "resolved": [
    "DFII10"
  ],
  "transformation": "lin"
}

GETSeries Search/v1/finance:fred/series-searchFree-text search across the FRED catalogue — the way to turn "10-year real

Parameters

querystringrequired: Free text. Matches series titles, notes and tags. Required.
pagenumberoptional: Result page (default 1, upstream stops at 30)
sortenumoptional: Result ordering. Default relevance. Values: relevance, popularity, title, frequency, units, seasonality, updated, start, end.

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/series-search?query=10-year+real+yield&page=1&sort=popularity" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "page": 1,
  "count": 6,
  "items": [
    {
      "url": "https://fred.stlouisfed.org/series/DFII10",
      "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed",
      "units": "Percent",
      "series": "DFII10",
      "frequency": "Daily",
      "description": "View data of the inflation-adjusted interest rates on 10-year Treasury securities with a constant maturity.",
      "observationEnd": "2026-08-18",
      "observationStart": "2003-01-02",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    },
    {
      "url": "https://fred.stlouisfed.org/series/DFII5",
      "title": "Market Yield on U.S. Treasury Securities at 5-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed",
      "units": "Percent",
      "series": "DFII5",
      "frequency": "Daily",
      "description": "H.15 Statistical Release notes (https://www.federalreserve.gov/releases/h15/default.htm) and the Treasury Yield Curve Methodology (https://home.treasury.gov/policy-issues/financing…",
      "observationEnd": "2026-08-18",
      "observationStart": "2003-01-02",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    },
    {
      "url": "https://fred.stlouisfed.org/series/DFII30",
      "title": "Market Yield on U.S. Treasury Securities at 30-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed",
      "units": "Percent",
      "series": "DFII30",
      "frequency": "Daily",
      "description": "H.15 Statistical Release notes (https://www.federalreserve.gov/releases/h15/default.htm) and the Treasury Yield Curve Methodology (https://home.treasury.gov/policy-issues/financing…",
      "observationEnd": "2026-08-18",
      "observationStart": "2010-02-22",
      "seasonalAdjustment": "Not Seasonally Adjusted"
    }
  ],
  "query": "real yield",
  "total": null,
  "dataset": "series-search",
  "hasMore": false,
  "nextPage": null,
  "provider": "fred"
}

GETSeries/v1/finance:fred/seriesMetadata for one FRED series — units, frequency, seasonal adjustment, the

Parameters

seriesstringoptional: One FRED series id. Case-insensitive. Default DGS10.

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/series?series=DGS10" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "url": "https://fred.stlouisfed.org/series/DFII10",
  "notes": "For further information regarding treasury constant maturity data, please refer to the H.15 Statistical Release notes and the Treasury Yield Curve Methodology . For questions on the data, please contact the data source . For questions on FRED functionality, please contact us here .",
  "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed",
  "units": "Percent",
  "series": "DFII10",
  "source": "Board of Governors of the Federal Reserve System (US)",
  "dataset": "series",
  "license": "https://fred.stlouisfed.org/legal/#copyright-public-domain",
  "release": {
    "name": "H.15 Selected Interest Rates",
    "releaseId": 18
  },
  "keywords": [
    "tips",
    "10-year",
    "maturity",
    "h15",
    "treasury",
    "securities"
  ],
  "provider": "fred",
  "frequency": "Daily",
  "copyrighted": false,
  "description": "View data of the inflation-adjusted interest rates on 10-year Treasury securities with a constant maturity.",
  "lastUpdated": "2026-08-19T15:16:00-05:00",
  "categoryPath": [
    {
      "name": "Money, Banking, & Finance",
      "categoryId": 32991
    },
    {
      "name": "Interest Rates",
      "categoryId": 22
    },
    {
      "name": "Treasury Inflation-Indexed Securities",
      "categoryId": 82
    },
    {
      "name": "Treasury Constant Maturity",
      "categoryId": 115
    }
  ],
  "nextReleaseDate": "2026-08-20",
  "seasonalAdjustment": "Not Seasonally Adjusted",
  "lastObservationDate": "2026-08-18",
  "lastObservationValue": 2.41,
  "lastObservationPeriod": "2026-08-18"
}

GETSources/v1/finance:fred/sourcesThe publishers behind the catalogue — statistical agencies, central banks and

Parameters

pagenumberoptional: Catalogue page, 50 sources each (default 1)
querystringoptional: Keep only sources whose name contains this text.

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/sources?page=1&query=federal+reserve" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "page": 1,
  "count": 12,
  "items": [
    {
      "url": "https://fred.stlouisfed.org/source?soid=1",
      "name": "Board of Governors of the Federal Reserve System (US)",
      "sourceId": 1
    },
    {
      "url": "https://fred.stlouisfed.org/source?soid=91",
      "name": "Federal Reserve Bank of Atlanta",
      "sourceId": 91
    },
    {
      "url": "https://fred.stlouisfed.org/source?soid=54",
      "name": "Federal Reserve Bank of Chicago",
      "sourceId": 54
    },
    {
      "url": "https://fred.stlouisfed.org/source?soid=90",
      "name": "Federal Reserve Bank of Cleveland",
      "sourceId": 90
    },
    {
      "url": "https://fred.stlouisfed.org/source?soid=89",
      "name": "Federal Reserve Bank of Dallas",
      "sourceId": 89
    },
    {
      "url": "https://fred.stlouisfed.org/source?soid=46",
      "name": "Federal Reserve Bank of Kansas City",
      "sourceId": 46
    }
  ],
  "query": "federal reserve",
  "total": null,
  "dataset": "sources",
  "hasMore": false,
  "nextPage": null,
  "provider": "fred"
}

GETTags/v1/finance:fred/tagsThe tag vocabulary FRED indexes its catalogue with — geography, frequency,

Parameters

pagenumberoptional: Tag page, ~50 tags each, most-used first (default 1)

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/tags?page=1" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "page": 1,
  "count": 50,
  "items": [
    {
      "tag": "nsa",
      "name": "Not Seasonally Adjusted",
      "seriesCount": 670000,
      "seriesCountApproximate": true
    },
    {
      "tag": "usa",
      "name": "United States of America",
      "seriesCount": 600000,
      "seriesCountApproximate": true
    },
    {
      "tag": "public domain: citation requested",
      "name": "Public Domain: Citation Requested",
      "seriesCount": 550000,
      "seriesCountApproximate": true
    },
    {
      "tag": "annual",
      "name": "Annual",
      "seriesCount": 440000,
      "seriesCountApproximate": true
    },
    {
      "tag": "county",
      "name": "County or County Equivalent",
      "seriesCount": 290000,
      "seriesCountApproximate": true
    },
    {
      "tag": "nation",
      "name": "Nation",
      "seriesCount": 250000,
      "seriesCountApproximate": true
    }
  ],
  "total": null,
  "dataset": "tags",
  "hasMore": true,
  "nextPage": 2,
  "provider": "fred"
}

GETVintage Dates/v1/finance:fred/vintage-datesEvery vintage ALFRED holds for one series — the dates on which that series was

Parameters

seriesstringoptional: One FRED/ALFRED series id. Case-insensitive. Default GDP.
lengthnumberoptional: Vintage dates to return, newest first (default 50, max 2000)

Request

curl -X GET "https://api.zpi.web.id/v1/finance:fred/vintage-dates?series=GDP&length=50" \
  -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

Example response

{
  "count": 50,
  "items": [
    "2026-07-30",
    "2026-06-25",
    "2026-05-28",
    "2026-04-30",
    "2026-04-09",
    "2026-03-13"
  ],
  "total": 413,
  "series": "GDP",
  "dataset": "vintage-dates",
  "provider": "fred",
  "firstVintage": "1991-12-04",
  "latestVintage": "2026-07-30"
}

{ "page": 1, "count": 50, "items": [ { "url": "https://fred.stlouisfed.org/series/DGS10", "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis", "units": "Percent", "series": "DGS10", "frequency": "Daily", "observationEnd": "2026-08-18", "observationStart": "1962-01-02", "seasonalAdjustment": "Not Seasonally Adjusted" }, { "url": "https://fred.stlouisfed.org/series/GS10", "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis", "units": "Percent", "series": "GS10", "frequency": "Monthly", "observationEnd": "Jul 2026", "observationStart": "Apr 1953", "seasonalAdjustment": "Not Seasonally Adjusted" }, { "url": "https://fred.stlouisfed.org/series/WGS10YR", "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis", "units": "Percent", "series": "WGS10YR", "frequency": "Weekly", "observationEnd": "2026-08-14", "observationStart": "1962-01-05", "seasonalAdjustment": "Not Seasonally Adjusted" } ], "total": null, "dataset": "category", "hasMore": true, "category": 115, "children": [ { "name": "Money, Banking, & Finance", "categoryId": 32991 }, { "name": "Interest Rates", "categoryId": 22 } ], "nextPage": 2, "provider": "fred" }

// npm i zpi-sdk import { ZpiClient } from "zpi-sdk"; const client = new ZpiClient({ apiKey: "zpi_xxxxxxxxxxxxxxxxxxxxxxxx" }); const data = await client.run("finance:fred", "category", { "category": 115, "page": 1 }); console.log(data);

curl -X GET "https://api.zpi.web.id/v1/finance:fred/observations-vintage?series=GDP&vintages=2020-01-30%2C2020-04-29%2C2026-07-30&from=2019-07-01&to=2019-12-31&length=100" \ -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

{ "to": "2019-12-31", "from": "2019-07-01", "count": 2, "items": [ { "date": "2019-10-01", "values": { "GDP": 21933.217 } }, { "date": "2019-07-01", "values": { "GDP": 21717.171 } } ], "total": 2, "series": [ "GDP" ], "columns": [ { "key": "GDP", "column": "GDP_20260820", "series": "GDP" } ], "dataset": "observations-vintage", "missing": [], "provider": "fred", "vintages": [] }

{ "to": "2026-08-21", "from": "2026-08-17", "page": 1, "year": 2026, "count": 50, "items": [ { "url": "https://fred.stlouisfed.org/release?rid=18", "date": "2026-01-02", "name": "H.15 Selected Interest Rates", "time": "3:15 pm", "released": true, "releaseId": 18 }, { "url": "https://fred.stlouisfed.org/release?rid=18", "date": "2026-01-05", "name": "H.15 Selected Interest Rates", "time": "3:15 pm", "released": true, "releaseId": 18 }, { "url": "https://fred.stlouisfed.org/release?rid=18", "date": "2026-01-06", "name": "H.15 Selected Interest Rates", "time": "3:15 pm", "released": true, "releaseId": 18 }, { "url": "https://fred.stlouisfed.org/release?rid=18", "date": "2026-01-07", "name": "H.15 Selected Interest Rates", "time": "3:15 pm", "released": true, "releaseId": 18 }, { "url": "https://fred.stlouisfed.org/release?rid=18", "date": "2026-01-08", "name": "H.15 Selected Interest Rates", "time": "3:15 pm", "released": true, "releaseId": 18 }, { "url": "https://fred.stlouisfed.org/release?rid=18", "date": "2026-01-09", "name": "H.15 Selected Interest Rates", "time": "3:15 pm", "released": true, "releaseId": 18 } ], "total": null, "dataset": "release-dates", "hasMore": true, "release": 18, "nextPage": 2, "provider": "fred" }

{ "page": 1, "count": 4, "items": [ { "url": "https://fred.stlouisfed.org/release?rid=131", "name": "G.13 Selected Interest Rates", "releaseId": 131 }, { "url": "https://fred.stlouisfed.org/release?rid=18", "name": "H.15 Selected Interest Rates", "releaseId": 18 }, { "url": "https://fred.stlouisfed.org/release?rid=484", "name": "Key ECB Interest Rates", "releaseId": 484 }, { "url": "https://fred.stlouisfed.org/release?rid=94", "name": "Survey of Secondary Market Prices and Yields, and Interest Rates for Home Loans", "releaseId": 94 } ], "query": "interest rates", "total": null, "dataset": "releases", "hasMore": false, "nextPage": null, "provider": "fred" }

curl -X GET "https://api.zpi.web.id/v1/finance:fred/series-observations?series=DGS10%2CDGS2%2CT10Y2Y&from=2026-01-01&to=2026-08-18&transformation=pc1&frequency=Monthly&aggregation=avg&length=100" \ -H "x-api-key: zpi_xxxxxxxxxxxxxxxxxxxxxxxx"

{ "to": "2026-08-01", "from": "2024-01-01", "count": 100, "items": [ { "date": "2026-07-31", "values": { "DFII10": 2.47 } }, { "date": "2026-07-30", "values": { "DFII10": 2.41 } }, { "date": "2026-07-29", "values": { "DFII10": 2.41 } }, { "date": "2026-07-28", "values": { "DFII10": 2.41 } }, { "date": "2026-07-27", "values": { "DFII10": 2.44 } }, { "date": "2026-07-24", "values": { "DFII10": 2.43 } } ], "total": 674, "series": [ "DFII10" ], "dataset": "series-observations", "missing": [], "provider": "fred", "resolved": [ "DFII10" ], "transformation": "lin" }

{ "page": 1, "count": 6, "items": [ { "url": "https://fred.stlouisfed.org/series/DFII10", "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed", "units": "Percent", "series": "DFII10", "frequency": "Daily", "description": "View data of the inflation-adjusted interest rates on 10-year Treasury securities with a constant maturity.", "observationEnd": "2026-08-18", "observationStart": "2003-01-02", "seasonalAdjustment": "Not Seasonally Adjusted" }, { "url": "https://fred.stlouisfed.org/series/DFII5", "title": "Market Yield on U.S. Treasury Securities at 5-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed", "units": "Percent", "series": "DFII5", "frequency": "Daily", "description": "H.15 Statistical Release notes (https://www.federalreserve.gov/releases/h15/default.htm) and the Treasury Yield Curve Methodology (https://home.treasury.gov/policy-issues/financing…", "observationEnd": "2026-08-18", "observationStart": "2003-01-02", "seasonalAdjustment": "Not Seasonally Adjusted" }, { "url": "https://fred.stlouisfed.org/series/DFII30", "title": "Market Yield on U.S. Treasury Securities at 30-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed", "units": "Percent", "series": "DFII30", "frequency": "Daily", "description": "H.15 Statistical Release notes (https://www.federalreserve.gov/releases/h15/default.htm) and the Treasury Yield Curve Methodology (https://home.treasury.gov/policy-issues/financing…", "observationEnd": "2026-08-18", "observationStart": "2010-02-22", "seasonalAdjustment": "Not Seasonally Adjusted" } ], "query": "real yield", "total": null, "dataset": "series-search", "hasMore": false, "nextPage": null, "provider": "fred" }

{ "url": "https://fred.stlouisfed.org/series/DFII10", "notes": "For further information regarding treasury constant maturity data, please refer to the H.15 Statistical Release notes and the Treasury Yield Curve Methodology . For questions on the data, please contact the data source . For questions on FRED functionality, please contact us here .", "title": "Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis, Inflation-Indexed", "units": "Percent", "series": "DFII10", "source": "Board of Governors of the Federal Reserve System (US)", "dataset": "series", "license": "https://fred.stlouisfed.org/legal/#copyright-public-domain", "release": { "name": "H.15 Selected Interest Rates", "releaseId": 18 }, "keywords": [ "tips", "10-year", "maturity", "h15", "treasury", "securities" ], "provider": "fred", "frequency": "Daily", "copyrighted": false, "description": "View data of the inflation-adjusted interest rates on 10-year Treasury securities with a constant maturity.", "lastUpdated": "2026-08-19T15:16:00-05:00", "categoryPath": [ { "name": "Money, Banking, & Finance", "categoryId": 32991 }, { "name": "Interest Rates", "categoryId": 22 }, { "name": "Treasury Inflation-Indexed Securities", "categoryId": 82 }, { "name": "Treasury Constant Maturity", "categoryId": 115 } ], "nextReleaseDate": "2026-08-20", "seasonalAdjustment": "Not Seasonally Adjusted", "lastObservationDate": "2026-08-18", "lastObservationValue": 2.41, "lastObservationPeriod": "2026-08-18" }

{ "page": 1, "count": 12, "items": [ { "url": "https://fred.stlouisfed.org/source?soid=1", "name": "Board of Governors of the Federal Reserve System (US)", "sourceId": 1 }, { "url": "https://fred.stlouisfed.org/source?soid=91", "name": "Federal Reserve Bank of Atlanta", "sourceId": 91 }, { "url": "https://fred.stlouisfed.org/source?soid=54", "name": "Federal Reserve Bank of Chicago", "sourceId": 54 }, { "url": "https://fred.stlouisfed.org/source?soid=90", "name": "Federal Reserve Bank of Cleveland", "sourceId": 90 }, { "url": "https://fred.stlouisfed.org/source?soid=89", "name": "Federal Reserve Bank of Dallas", "sourceId": 89 }, { "url": "https://fred.stlouisfed.org/source?soid=46", "name": "Federal Reserve Bank of Kansas City", "sourceId": 46 } ], "query": "federal reserve", "total": null, "dataset": "sources", "hasMore": false, "nextPage": null, "provider": "fred" }

{ "page": 1, "count": 50, "items": [ { "tag": "nsa", "name": "Not Seasonally Adjusted", "seriesCount": 670000, "seriesCountApproximate": true }, { "tag": "usa", "name": "United States of America", "seriesCount": 600000, "seriesCountApproximate": true }, { "tag": "public domain: citation requested", "name": "Public Domain: Citation Requested", "seriesCount": 550000, "seriesCountApproximate": true }, { "tag": "annual", "name": "Annual", "seriesCount": 440000, "seriesCountApproximate": true }, { "tag": "county", "name": "County or County Equivalent", "seriesCount": 290000, "seriesCountApproximate": true }, { "tag": "nation", "name": "Nation", "seriesCount": 250000, "seriesCountApproximate": true } ], "total": null, "dataset": "tags", "hasMore": true, "nextPage": 2, "provider": "fred" }

{ "count": 50, "items": [ "2026-07-30", "2026-06-25", "2026-05-28", "2026-04-30", "2026-04-09", "2026-03-13" ], "total": 413, "series": "GDP", "dataset": "vintage-dates", "provider": "fred", "firstVintage": "1991-12-04", "latestVintage": "2026-07-30" }

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