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

What happens when I hit the quota?

Requests return 429 with the limit, what you have used, and which window you tripped — nothing is queued, and nothing is charged. The monthly quota resets on the 1st (UTC). There is no rollover: unused requests do not carry into the next month.

Do failed requests use up my quota?

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?

Zapi focuses on a consistent REST contract — one API key, one response format, one error pattern for every source. No need to learn per-provider quirks like on traditional marketplaces, and no need to set up scraping workflows like on Apify.

What about the legality of accessing public data?

Zapi only accesses data that is publicly available without a login. Responsibility for how it is ultimately used stays with the developer — make sure your use case complies with the original source's ToS and the regulations in your operating region.

Is there an official SDK?

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 catalogue yet?

Yes, through the community Discord, on any tier.

FRED

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

10 endpoints560 calls10/10 passing

Get API key

Name	Type	In	Description
category	number	query	FRED category id. Omit for the root of the tree.
page	number	query	Page of the series listing (default 1).

Observations Vintage

Point-in-time observations — what a series looked like on the day it was

GET/v1/finance:fred/observations-vintage

passing · 0.7s6h cache

Parameters

Name	Type	In	Description
series	string	query	FRED series ids, comma-separated. A missing observation comes back as null, never 0. Default GDP.
vintages	string	query	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.
from	string	query	First observation date, YYYY-MM-DD.
to	string	query	Last observation date, YYYY-MM-DD.
length	number	query	Observations to return, newest first (default 100, max 20000).

Example response

{"project":"finance:fred",  "data": {"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":[]  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Release Dates

The US statistical release calendar — what is published on a given day, at what

GET/v1/finance:fred/release-dates

passing · 0.6s1h cache

Parameters

Name	Type	In	Description
from	string	query	First calendar date, YYYY-MM-DD. Defaults to today.
to	string	query	Last calendar date, YYYY-MM-DD. Defaults to `from`.
release	number	query	Restrict to one release id, from the `releases` endpoint.
year	number	query	Whole calendar year. Use with `release`; overrides `from`/`to`.
page	number	query	Page of the calendar, 50 entries each (default 1).

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Releases

The release catalogue — every statistical publication FRED redistributes,

GET/v1/finance:fred/releases

passing · 7.8s1d cache

Parameters

Name	Type	In	Description
page	number	query	Catalogue page, 50 releases each (default 1).
query	string	query	Keep only releases whose name contains this text.

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Series Observations

FRED observations — any economic series the St. Louis Fed publishes, by id.

GET/v1/finance:fred/series-observations

passing · 1.1s1h cache

Parameters

Name	Type	In	Description
series	string	query	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.
from	string	query	First observation date, YYYY-MM-DD. Applied to every series.
to	string	query	Last observation date, YYYY-MM-DD. Applied to every series.
transformation	enum	query	Server-side transform: lin (level), chg, ch1, pch, pc1 (year-over-year %), pca, cch, cca, log. Default lin. One of lin, chg, ch1, pch, pc1, pca, cch, cca, log.
frequency	enum	query	Resample a higher-frequency series down to Daily, Weekly, Biweekly, Monthly, Quarterly, Semiannual or Annual. One of Daily, Weekly, Biweekly, Monthly, Quarterly, Semiannual, Annual.
aggregation	enum	query	How `frequency` collapses each bucket: avg, sum or eop (end of period). Default avg. One of avg, sum, eop.
length	number	query	Observations to return, newest first (default 100, max 20000).

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Series Search

Free-text search across the FRED catalogue — the way to turn "10-year real

GET/v1/finance:fred/series-search

passing · 0.8s1d cache

Parameters

Name	Type	In	Description
query	string	query	Free text. Matches series titles, notes and tags. Required. Required.
page	number	query	Result page (default 1, upstream stops at 30).
sort	enum	query	Result ordering. Default relevance. One of relevance, popularity, title, frequency, units, seasonality, updated, start, end.

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Series

Metadata for one FRED series — units, frequency, seasonal adjustment, the

GET/v1/finance:fred/series

passing · 1.2s6h cache

Parameters

Name	Type	In	Description
series	string	query	One FRED series id. Case-insensitive. Default DGS10.

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Sources

The publishers behind the catalogue — statistical agencies, central banks and

GET/v1/finance:fred/sources

passing · 4.0s1d cache

Parameters

Name	Type	In	Description
page	number	query	Catalogue page, 50 sources each (default 1).
query	string	query	Keep only sources whose name contains this text.

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Name	Type	In	Description
page	number	query	Tag page, ~50 tags each, most-used first (default 1).

Vintage Dates

Every vintage ALFRED holds for one series — the dates on which that series was

GET/v1/finance:fred/vintage-dates

passing · 0.5s6h cache

Parameters

Name	Type	In	Description
series	string	query	One FRED/ALFRED series id. Case-insensitive. Default GDP.
length	number	query	Vintage dates to return, newest first (default 50, max 2000).

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Try it

Live request with your key

const data = await client.run(  "finance:fred",  "category",  { category: 115, page: 1 });

FRED

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

10 endpoints560 calls10/10 passing

Get API key

Walk the FRED category tree: child categories at a node, and the series that

GET/v1/…fred/category

passing · 1.0s6h cache

Try it

Parameters

Example response

{"project":"finance:fred",  "data": {"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"  },"timestamp":"2026-08-20T15:00:47Z"}

Errors

401Missing or invalid x-api-key
404Not found or private
429Rate limit or monthly quota reached

Code

const data = await client.run(  "finance:fred",  "category",  { category: 115, page: 1 });

FRED

Category

Parameters

Example response

Errors

Observations Vintage

Parameters

Example response

Errors

Release Dates

Parameters

Example response

Errors

Releases

Parameters

Example response

Errors

Series Observations

Parameters

Example response

Errors

Series Search

Parameters

Example response

Errors

Series

Parameters

Example response

Errors

Sources

Parameters

Example response

Errors

Tags

Parameters

Example response

Errors

Vintage Dates

Parameters

Example response

Errors

Parameters

Example response

Errors

Code