Federal Per Diem Rates API

API ID 14559

CONUS federal per diem rates by city, county or ZIP, plus trip totals with the 75% rule.

API Documentation

Endpoints

Request
Give one location (city + state, county + state, zip, or did) and a date (default today) or a fiscal year (fy, all 12 months). Returns the area, the lodging rate for that date's month, the M&IE rate and its breakdown, all 12 months and the seasons. A city spread over counties with different rates, or a ZIP code GSA lists under several areas, comes back with "alternatives" and ambiguous: true.
Endpoint ID: 37296
GET https://zylalabs.com/api/14559/federal+per+diem+rates+api/37296/per+diem+rates+for+a+place+and+date
INPUT PARAMETERS

Per diem rates for a place and date — Endpoint Features

Object Description
city Optional City or town (with state). A GSA destination name, a GSA city-limits area, or any Census place; a place GSA does not name gets its county's rate.
state Optional Two-letter code or name (with city or county). CONUS only: the 48 contiguous states and DC.
county Optional County, parish or Virginia independent city (with state): "Fairfax", "Fairfax County", "City of Richmond".
zip Optional 5-digit ZIP code (ZIP+4 is fine), as a string. Follows GSA's ZIP code file.
did Optional GSA destination ID of a non-standard area (from GET /locations).
date Optional YYYY-MM-DD, from 2025-10-01 to 2027-09-30 (FY2026-FY2027). Default: today.
fy Optional Fiscal year (2026 or 2027) instead of a date: no single-day rate, all months.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

city
state
county
zip
did
date
fy
API EXAMPLE RESPONSE
JSON
{
    "query": {
        "city": "Boston",
        "state": "MA",
        "date": "2026-11-05"
    },
    "fiscalYear": 2027,
    "date": "2026-11-05",
    "month": "2026-11",
    "location": {
        "destinationId": 148,
        "name": "Boston / Cambridge",
        "state": "MA",
        "definedAs": "Suffolk, city of Cambridge",
        "standardRate": false,
        "fiscalYear": 2027,
        "counties": [
            "Suffolk County"
        ],
        "cities": [
            "Cambridge"
        ]
    },
    "matchedBy": "destination-name",
    "lodging": 213,
    "mie": 92,
    "maxPerDiem": 305,
    "months": [
        {
            "month": "2026-10",
            "lodging": 365
        },
        {
            "month": "2026-11",
            "lodging": 213
        },
        {
            "month": "2026-12",
            "lodging": 213
        },
        {
            "month": "2027-01",
            "lodging": 213
        },
        {
            "month": "2027-02",
            "lodging": 213
        },
        {
            "month": "2027-03",
            "lodging": 305
        },
        {
            "month": "2027-04",
            "lodging": 305
        },
        {
            "month": "2027-05",
            "lodging": 305
        },
        {
            "month": "2027-06",
            "lodging": 305
        },
        {
            "month": "2027-07",
            "lodging": 305
        },
        {
            "month": "2027-08",
            "lodging": 305
        },
        {
            "month": "2027-09",
            "lodging": 365
        }
    ],
    "seasons": [
        {
            "from": "2026-10",
            "to": "2026-10",
            "lodging": 365
        },
        {
            "from": "2026-11",
            "to": "2027-02",
            "lodging": 213
        },
        {
            "from": "2027-03",
            "to": "2027-08",
            "lodging": 305
        },
        {
            "from": "2027-09",
            "to": "2027-09",
            "lodging": 365
        }
    ],
    "mieBreakdown": {
        "breakfast": 23,
        "lunch": 26,
        "dinner": 38,
        "incidentals": 5,
        "firstLastDay": 69
    },
    "alternatives": [],
    "notes": [],
    "source": {
        "citation": "Source: U.S. General Services Administration (GSA), per diem rate files for FY2026 and FY2027 (gsa.gov/perdiem).",
        "url": "https://www.gsa.gov/perdiem",
        "scope": "CONUS only: the 48 contiguous states and the District of Columbia. Alaska, Hawaii, US territories and foreign locations are not included.",
        "disclaimer": "Not affiliated with or endorsed by GSA. Rates as GSA published them; not legal or tax advice. Verify at gsa.gov/perdiem before you reimburse or claim.",
        "dataBuilt": "2026-10-16"
    }
}
Per diem rates for a place and date — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14559/federal+per+diem+rates+api/37296/per+diem+rates+for+a+place+and+date?city=Boston&state=MA&date=2026-11-05' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
One location and the first and last day of travel. Nightly lodging for each night's month and fiscal year, M&IE at 75% on the first and last day and 100% between. Use POST /trip for several places or provided meals.
Endpoint ID: 37297
GET https://zylalabs.com/api/14559/federal+per+diem+rates+api/37297/trip+totals+for+one+place
INPUT PARAMETERS

Trip totals for one place — Endpoint Features

Object Description
did Optional GSA destination ID of a non-standard area (from GET /locations).
start Required First day of travel, YYYY-MM-DD.
end Required Last day of travel, YYYY-MM-DD (the same day for a same-day trip).
city Optional City or town (with state). A GSA destination name, a GSA city-limits area, or any Census place; a place GSA does not name gets its county's rate.
state Optional Two-letter code or name (with city or county). CONUS only: the 48 contiguous states and DC.
county Optional County, parish or Virginia independent city (with state): "Fairfax", "Fairfax County", "City of Richmond".
zip Optional 5-digit ZIP code (ZIP+4 is fine), as a string. Follows GSA's ZIP code file.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

did
start
end
city
state
county
zip
API EXAMPLE RESPONSE
JSON
{
    "start": "2026-09-29",
    "end": "2026-10-02",
    "days": 4,
    "nights": 3,
    "fiscalYears": [
        2026,
        2027
    ],
    "legs": [
        {
            "arrive": "2026-09-29",
            "depart": "2026-10-02",
            "nights": 3,
            "location": {
                "destinationId": 2,
                "name": "Gulf Shores",
                "state": "AL",
                "definedAs": "Baldwin",
                "standardRate": false,
                "fiscalYear": 2026,
                "matchedBy": "destination-name"
            }
        }
    ],
    "lines": [
        {
            "date": "2026-09-29",
            "fiscalYear": 2026,
            "lodging": {
                "location": {
                    "destinationId": 2,
                    "name": "Gulf Shores",
                    "state": "AL",
                    "definedAs": "Baldwin",
                    "standardRate": false,
                    "fiscalYear": 2026
                },
                "rate": 134
            },
            "mie": {
                "location": {
                    "destinationId": 2,
                    "name": "Gulf Shores",
                    "state": "AL",
                    "definedAs": "Baldwin",
                    "standardRate": false,
                    "fiscalYear": 2026
                },
                "rate": 74,
                "percent": 75,
                "base": 55.5,
                "amount": 55.5
            },
            "total": 189.5
        },
        {
            "date": "2026-09-30",
            "fiscalYear": 2026,
            "lodging": {
                "location": {
                    "destinationId": 2,
                    "name": "Gulf Shores",
                    "state": "AL",
                    "definedAs": "Baldwin",
                    "standardRate": false,
                    "fiscalYear": 2026
                },
                "rate": 134
            },
            "mie": {
                "location": {
                    "destinationId": 2,
                    "name": "Gulf Shores",
                    "state": "AL",
                    "definedAs": "Baldwin",
                    "standardRate": false,
                    "fiscalYear": 2026
                },
                "rate": 74,
                "percent": 100,
                "base": 74,
                "amount": 74
            },
            "total": 208
        },
        {
            "date": "2026-10-01",
            "fiscalYear": 2027,
            "lodging": {
                "location": {
                    "destinationId": 2,
                    "name": "Gulf Shores",
                    "state": "AL",
                    "definedAs": "Baldwin",
                    "standardRate": false,
                    "fiscalYear": 2027
                },
                "rate": 144
            },
            "mie": {
                "location": {
                    "destinationId": 2,
                    "name": "Gulf Shores",
                    "state": "AL",
                    "definedAs": "Baldwin",
                    "standardRate": false,
                    "fiscalYear": 2027
                },
                "rate": 74,
                "percent": 100,
                "base": 74,
                "amount": 74
            },
            "total": 218
        },
        {
            "date": "2026-10-02",
            "fiscalYear": 2027,
            "lodging": null,
            "mie": {
                "location": {
                    "destinationId": 2,
                    "name": "Gulf Shores",
                    "state": "AL",
                    "definedAs": "Baldwin",
                    "standardRate": false,
                    "fiscalYear": 2027
                },
                "rate": 74,
                "percent": 75,
                "base": 55.5,
                "amount": 55.5
            },
            "total": 55.5
        }
    ],
    "totals": {
        "lodging": 412,
        "mie": 259,
        "mealDeductions": 0,
        "total": 671
    },
    "rules": [
        "Lodging: maximum rate per night for the place, month and fiscal year of that night; no lodging on the last day; taxes not included (41 CFR 301-11.16).",
        "M&IE: 75% on the first and last day of travel, 100% on full days (41 CFR 301-11.101).",
        "M&IE rate: the place where you lodge that night; the last day uses the previous night's place (41 CFR 301-11.102).",
        "Provided meals: the GSA M&IE breakdown amount is deducted, the full amount even on the 75% days, never below the incidental-expenses amount (41 CFR 301-11.21)."
    ],
    "warnings": [],
    "source": {
        "citation": "Source: U.S. General Services Administration (GSA), per diem rate files for FY2026 and FY2027 (gsa.gov/perdiem).",
        "url": "https://www.gsa.gov/perdiem",
        "scope": "CONUS only: the 48 contiguous states and the District of Columbia. Alaska, Hawaii, US territories and foreign locations are not included.",
        "disclaimer": "Not affiliated with or endorsed by GSA. Rates as GSA published them; not legal or tax advice. Verify at gsa.gov/perdiem before you reimburse or claim.",
        "dataBuilt": "2026-10-16"
    }
}
Trip totals for one place — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14559/federal+per+diem+rates+api/37297/trip+totals+for+one+place?start=2026-09-29&end=2026-10-02&city=Gulf Shores&state=AL' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
Breakfast, lunch, dinner and incidentals for each CONUS M&IE tier, and the 75% first/last-day amount, from GSA's FY 25-Present breakdown.
Endpoint ID: 37298
GET https://zylalabs.com/api/14559/federal+per+diem+rates+api/37298/m+ie+breakdown+by+tier
INPUT PARAMETERS

M IE breakdown by tier — Endpoint Features

Object Description
rate Optional One tier (68, 74, 80, 86 or 92).
fy Optional Fiscal year (2026 or 2027).

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

rate
fy
API EXAMPLE RESPONSE
JSON
{
    "fiscalYears": [
        2026
    ],
    "tiers": [
        {
            "total": 68,
            "breakfast": 16,
            "lunch": 19,
            "dinner": 28,
            "incidentals": 5,
            "firstLastDay": 51
        },
        {
            "total": 74,
            "breakfast": 18,
            "lunch": 20,
            "dinner": 31,
            "incidentals": 5,
            "firstLastDay": 55.5
        },
        {
            "total": 80,
            "breakfast": 20,
            "lunch": 22,
            "dinner": 33,
            "incidentals": 5,
            "firstLastDay": 60
        },
        {
            "total": 86,
            "breakfast": 22,
            "lunch": 23,
            "dinner": 36,
            "incidentals": 5,
            "firstLastDay": 64.5
        },
        {
            "total": 92,
            "breakfast": 23,
            "lunch": 26,
            "dinner": 38,
            "incidentals": 5,
            "firstLastDay": 69
        }
    ],
    "standardMie": {
        "FY2026": 68
    },
    "notes": [
        "Use the breakdown to deduct meals provided by the government or included in a registration fee (41 CFR 301-11.21). Meals on a common carrier and a hotel's complimentary breakfast are not deducted.",
        "firstLastDay is 75% of the total, for the day of departure and the last day of travel (41 CFR 301-11.101). A provided meal on those days is deducted at its full amount from the 75% figure.",
        "Deductions never take a day below the incidentals amount.",
        "These tiers are GSA's \"FY 25-Present\" breakdown, which covers both loaded fiscal years."
    ],
    "source": {
        "citation": "Source: U.S. General Services Administration (GSA), per diem rate files for FY2026 and FY2027 (gsa.gov/perdiem).",
        "url": "https://www.gsa.gov/perdiem",
        "scope": "CONUS only: the 48 contiguous states and the District of Columbia. Alaska, Hawaii, US territories and foreign locations are not included.",
        "disclaimer": "Not affiliated with or endorsed by GSA. Rates as GSA published them; not legal or tax advice. Verify at gsa.gov/perdiem before you reimburse or claim.",
        "dataBuilt": "2026-10-16"
    }
}
M IE breakdown by tier — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14559/federal+per+diem+rates+api/37298/m+ie+breakdown+by+tier?fy=2026' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
GSA's non-standard areas (every other CONUS county gets the standard rate): name, destination ID, counties and city-limits areas, M&IE, lodging range and seasons. Filter by state (the DC area also shows under VA and MD) or search names, counties and cities with q.
Endpoint ID: 37299
GET https://zylalabs.com/api/14559/federal+per+diem+rates+api/37299/non-standard+areas+by+state+or+search
INPUT PARAMETERS

Non-standard areas by state or search — Endpoint Features

Object Description
state Optional Two-letter code or name.
q Optional Search text (part of a name, county or city).
fy Optional Fiscal year (default: the current one).
limit Optional 1-100 (default 25).
offset Optional For paging (default 0).

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

state
q
fy
limit
offset
API EXAMPLE RESPONSE
JSON
{
    "fiscalYear": 2027,
    "standard": {
        "lodging": 113,
        "mie": 68,
        "appliesTo": "every CONUS county and city not covered by a non-standard area"
    },
    "total": 13,
    "count": 2,
    "offset": 0,
    "locations": [
        {
            "destinationId": 147,
            "name": "Andover",
            "state": "MA",
            "definedAs": "Essex",
            "standardRate": false,
            "fiscalYear": 2027,
            "counties": [
                "Essex County"
            ],
            "cities": [],
            "mie": 80,
            "lodging": {
                "min": 137,
                "max": 137,
                "seasonal": false
            },
            "seasons": [
                {
                    "from": "2026-10",
                    "to": "2027-09",
                    "lodging": 137
                }
            ]
        },
        {
            "destinationId": 148,
            "name": "Boston / Cambridge",
            "state": "MA",
            "definedAs": "Suffolk, city of Cambridge",
            "standardRate": false,
            "fiscalYear": 2027,
            "counties": [
                "Suffolk County"
            ],
            "cities": [
                "Cambridge"
            ],
            "mie": 92,
            "lodging": {
                "min": 213,
                "max": 365,
                "seasonal": true
            },
            "seasons": [
                {
                    "from": "2026-10",
                    "to": "2026-10",
                    "lodging": 365
                },
                {
                    "from": "2026-11",
                    "to": "2027-02",
                    "lodging": 213
                },
                {
                    "from": "2027-03",
                    "to": "2027-08",
                    "lodging": 305
                },
                {
                    "from": "2027-09",
                    "to": "2027-09",
                    "lodging": 365
                }
            ]
        }
    ],
    "source": {
        "citation": "Source: U.S. General Services Administration (GSA), per diem rate files for FY2026 and FY2027 (gsa.gov/perdiem).",
        "url": "https://www.gsa.gov/perdiem",
        "scope": "CONUS only: the 48 contiguous states and the District of Columbia. Alaska, Hawaii, US territories and foreign locations are not included.",
        "disclaimer": "Not affiliated with or endorsed by GSA. Rates as GSA published them; not legal or tax advice. Verify at gsa.gov/perdiem before you reimburse or claim.",
        "dataBuilt": "2026-10-16"
    }
}
Non-standard areas by state or search — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14559/federal+per+diem+rates+api/37299/non-standard+areas+by+state+or+search?state=MA&fy=2027&limit=2&offset=Optional' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
The fiscal years in the data, their dates, standard rates and number of non-standard areas, the GSA and Census source files with SHA-256 hashes, the FTR rules the trip calculator applies, and the credit line.
Endpoint ID: 37300
GET https://zylalabs.com/api/14559/federal+per+diem+rates+api/37300/loaded+fiscal+years+sources+and+rules
INPUT PARAMETERS

Free test requests remaining: 3 of 3.

This endpoint does not require any input parameters.

API EXAMPLE RESPONSE
JSON
{
    "fiscalYears": [
        {
            "fiscalYear": 2026,
            "begin": "2025-10-01",
            "end": "2026-09-30",
            "standard": {
                "lodging": 110,
                "mie": 68
            },
            "nonStandardAreas": 296,
            "mieTiers": [
                68,
                74,
                80,
                86,
                92
            ],
            "files": [
                "FY2026_PerDiemMasterRatesFile.xlsx",
                "FY2026_ZipCodeFile.xlsx"
            ]
        },
        {
            "fiscalYear": 2027,
            "begin": "2026-10-01",
            "end": "2027-09-30",
            "standard": {
                "lodging": 113,
                "mie": 68
            },
            "nonStandardAreas": 295,
            "mieTiers": [
                68,
                74,
                80,
                86,
                92
            ],
            "files": [
                "FY2027_PerDiemRates_Validated090126.xlsx",
                "FY2027PerDiemZipCode_Validated090126.xlsx"
            ]
        }
    ],
    "coverage": {
        "states": 48,
        "plusDC": true,
        "zipCodes": 40426,
        "scope": "CONUS only (48 contiguous states and DC)."
    },
    "sources": [
        {
            "file": "FY2027_PerDiemRates_Validated090126.xlsx",
            "what": "FY 27 Per Diem Rates (XLSX)",
            "url": "https://www.gsa.gov/system/files/FY2027_PerDiemRates_Validated090126.xlsx",
            "sha256": "818af7d0e568228804f6e8d3d475504cf0c22562544f4d808509fc4aa8790618",
            "downloaded": "2026-10-16"
        },
        {
            "file": "FY2026_PerDiemMasterRatesFile.xlsx",
            "what": "FY 26 Per Diem Rates (XLSX)",
            "url": "https://www.gsa.gov/system/files/FY2026_PerDiemMasterRatesFile.xlsx",
            "sha256": "5a3214fdafa1034799e2ff61d8997cface1a1ff0322be3efad78595b12b4e244",
            "downloaded": "2026-10-16"
        },
        {
            "file": "FY2027PerDiemZipCode_Validated090126.xlsx",
            "what": "FY 27 Per Diem ZIP Code file (XLSX)",
            "url": "https://www.gsa.gov/system/files/FY2027PerDiemZipCode_Validated090126.xlsx",
            "sha256": "0837f8d7a50bfc1029263b04bec7490873dbe3084554e5128c2ae23ba3eec7f1",
            "downloaded": "2026-10-16"
        },
        {
            "file": "FY2026_ZipCodeFile.xlsx",
            "what": "FY 26 Per Diem ZIP Code file (XLSX)",
            "url": "https://www.gsa.gov/system/files/FY2026_ZipCodeFile.xlsx",
            "sha256": "3278fa7bd7c04bf4337260c2e53f97e55b520a514e8820d5cfa681dad41a4824",
            "downloaded": "2026-10-16"
        },
        {
            "file": "FY2025_MIE_Breakdown.docx",
            "what": "FY 25-Present M&IE Breakdown (DOCX)",
            "url": "https://www.gsa.gov/system/files/FY%202025%20MIE%20Breakdown.docx",
            "sha256": "cc55916865cb21268a1fcbd1b75c5077698207033b41672fd1142f385c8fa4ef",
            "downloaded": "2026-10-16"
        },
        {
            "file": "FY2027perdiemhighlights.docx",
            "what": "FY 27 Per Diem Rates Highlights (DOCX)",
            "url": "https://www.gsa.gov/system/files/FY2027perdiemhighlights.docx",
            "sha256": "4a18b50cf4df30be9a818dd376d415317672b30373a5760db3009a6a0feee5c0",
            "downloaded": "2026-10-16"
        },
        {
            "file": "national_county2020.txt",
            "what": "Census Bureau 2020 national county reference file",
            "url": "https://www2.census.gov/geo/docs/reference/codes2020/national_county2020.txt",
            "sha256": "9f6e5f6eb6ac2f5e9a36d5fd01dec77991bddc75118f748a069441a4782970d6",
            "downloaded": "2026-10-16"
        },
        {
            "file": "national_place2020.txt",
            "what": "Census Bureau 2020 national place reference file",
            "url": "https://www2.census.gov/geo/docs/reference/codes2020/national_place2020.txt",
            "sha256": "302ff3cf031217aca032d89f42c0dd93611a76d72ab2036944fa40d5c23c6613",
            "downloaded": "2026-10-16"
        }
    ],
    "rules": [
        "41 CFR 301-11.101: 75% of the M&IE rate on the day of departure and the last day of travel; 100% on full days; 75% for each day of a trip of more than 12 but less than 24 hours.",
        "41 CFR 301-11.102: the M&IE rate of the place you lodge; on the day you return, the rate of the previous day.",
        "41 CFR 301-11.21: deduct provided meals at the M&IE breakdown amounts, never below the incidentals amount."
    ],
    "license": "GSA's per diem files and the Census Bureau reference files used to map cities to counties are US government works (public domain in the US). Credit: GSA, gsa.gov/perdiem.",
    "source": {
        "citation": "Source: U.S. General Services Administration (GSA), per diem rate files for FY2026 and FY2027 (gsa.gov/perdiem).",
        "url": "https://www.gsa.gov/perdiem",
        "scope": "CONUS only: the 48 contiguous states and the District of Columbia. Alaska, Hawaii, US territories and foreign locations are not included.",
        "disclaimer": "Not affiliated with or endorsed by GSA. Rates as GSA published them; not legal or tax advice. Verify at gsa.gov/perdiem before you reimburse or claim.",
        "dataBuilt": "2026-10-16"
    }
}
Loaded fiscal years sources and rules — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14559/federal+per+diem+rates+api/37300/loaded+fiscal+years+sources+and+rules' --header 'Authorization: Bearer YOUR_API_KEY' 


    

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Federal Per Diem Rates API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

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Starts at
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Overview

CONUS federal per diem rates by city, county or ZIP, plus trip totals with the 75% rule.

Federal Per Diem Rates API FAQs

Each endpoint returns specific data related to federal per diem rates, including lodging rates, M&IE breakdowns, trip totals, and non-standard area information. For example, the trip totals endpoint provides lodging costs for each night and M&IE calculations based on travel dates.

Key fields include "location" (name and state), "lodging" (rate), "mie" (Meals & Incidental Expenses), "fiscalYear," and "months" (for lodging rates). Each endpoint has unique fields relevant to its specific data, such as "legs" in trip totals.

Parameters vary by endpoint. For the per diem rates endpoint, you can specify "city," "state," "county," "ZIP," and "date." The trip totals endpoint requires "start" and "end" dates, while the M&IE breakdown endpoint focuses on fiscal years.

Response data is structured in JSON format, organized into nested objects. For example, the trip totals response includes arrays for "legs" and "lines," detailing each travel leg and associated costs, making it easy to parse and utilize.

The data is sourced from the General Services Administration (GSA) and Census Bureau files. The API includes SHA-256 hashes for data integrity, ensuring that users can verify the authenticity of the data provided.

Typical use cases include calculating travel expenses for federal employees, budgeting for trips, and analyzing per diem rates across different locations. Users can also compare lodging rates and M&IE across various fiscal years.

Users can utilize the returned data by extracting key fields for reporting or analysis. For instance, they can calculate total travel costs by summing lodging and M&IE values from the trip totals endpoint, or assess variations in rates by month.

If the API returns partial or empty results, users should check the parameters for accuracy. For ambiguous locations, the response will indicate "alternatives" to help users refine their queries. Always ensure the specified date and location are valid.

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