{
"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"
}
}
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'
{
"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"
}
}
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'
{
"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"
}
}
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'
{
"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"
}
}
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'
{
"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"
}
}
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'
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.
| Header | Description |
|---|---|
Authorization
|
Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
|
No long-term commitment. Upgrade, downgrade, or cancel anytime.
CONUS federal per diem rates by city, county or ZIP, plus trip totals with the 75% rule.
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.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
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