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API · /fueleconomy-api

FuelEconomy.gov API

healthy 3,948 Subscribers

Official US vehicle fuel-economy data as an API, powered by FuelEconomy.gov — the joint US EPA and Department of Energy resource behind the fuel-economy window sticker on every car, SUV and truck sold in the United States since 1984. Browse the catalogue step by step — model years, then makes, then models, then the engine/transmission trims (each carrying the vehicle id you need for the detail call) — and pull a vehicle's complete fuel-economy record: city, highway and combined MPG, fuel type, engine (number of cylinders and displacement), transmission, EPA vehicle class and drivetrain, the estimated annual fuel cost, tailpipe CO2 emissions in grams per mile, the barrels of petroleum consumed per year and the estimated five-year fuel-cost saving (or extra spend) versus an average new vehicle. Ideal for car-shopping and comparison tools, total-cost-of-ownership and emissions calculators, fleet management and sustainability reporting. The data is authoritative, official EPA/DOE test data and is public domain; it covers US-market light-duty vehicles. Vehicle ids come from the trims endpoint, reached via the year -> make -> model -> trim chain.

#fueleconomy #mpg #vehicles #epa #emissions #automotive #government-data
api.oanor.com/fueleconomy-api
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Machine-readable spec so AI agents can integrate this API.

/api/fueleconomy-api/openapi.json
/api/fueleconomy-api/llms.txt

Discovery: GET /api/index.json lists every API.

FuelEconomy.gov API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
324 ms
Server probes · 24h
Subscribers
3,948
active
Total calls
114
last 7 days
status Full status page → · 18 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 600 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 600 calls/month
  • 2 req/sec
  • Browse & full vehicle records
  • No credit card
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Starter

€7.20 /month

  • 22,300 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 22.3k calls/month
  • 6 req/sec
  • MPG & emissions data
  • Email support
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Pro

€21.80 /month

  • 93,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 93k calls/month
  • 15 req/sec
  • Cost & TCO calculators
  • Priority support
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Mega

€60.50 /month

  • 410,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 410k calls/month
  • 40 req/sec
  • Fleet & sustainability
  • Dedicated SLA
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When locked crypto tokens vest into circulation, who they go to, and how much supply is still to come — live from DeFiLlama's open emissions dataset, no key. A token's price tells you what it costs today; its unlock schedule tells you the supply pressure ahead, the single biggest and most predictable overhang in crypto. When a large tranche of insider, private-sale or team tokens vests, it is fresh sell-side supply hitting a fixed amount of demand — and these dates are known in advance. A static "percent unlocked" number (which dilution APIs give) is only a snapshot; what a trader needs is the calendar: when is the next cliff, how many tokens, what share of total supply, and to whom. The protocols endpoint lists every token DeFiLlama tracks a schedule for (searchable). The next endpoint is the trading signal — the next upcoming cliff unlock for a token: its date, days away, token amount, the share of total supply it dilutes, the unlock type and the recipients (insiders, private sale, team, ecosystem), plus the unlocks after it. The schedule endpoint returns the fuller picture: total and max supply, the allocation by category with how much of each is already unlocked, the count of past and future events, the tokens still locked, and the upcoming events. The token-unlock / vesting-schedule cut — distinct from the tokenomics-and-dilution APIs (which give the static supply and FDV snapshot, not the dated unlock calendar) and from price and market-cap APIs. Amounts are in tokens and as a share of total supply; pair with any price API for the dollar value.

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Independent greenhouse-gas emissions data as an API — powered by Climate TRACE, the coalition (backed by Al Gore) that monitors global emissions from satellites, sensors and AI rather than self-reported figures. Get any country's emissions for a given year — CO2, methane (CH4) and nitrous oxide (N2O) in tonnes, plus CO2-equivalent over 100- and 20-year horizons — together with the country's global emissions rank and its share of total world emissions; pass several countries at once to compare them side by side. List the full set of sectors, subsectors and gases that Climate TRACE tracks (power, transportation, manufacturing, agriculture, fossil-fuel operations, waste and more). From China and the United States to any nation on Earth, with data from 2015 onward, it is ideal for climate, ESG, sustainability, policy, journalism and research applications. An independent emissions-inventory data source — distinct from electricity-grid carbon intensity, activity footprint calculators and climate classification. Open data from Climate TRACE (CC BY 4.0).

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for FuelEconomy.gov API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call FuelEconomy.gov API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for FuelEconomy.gov API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does FuelEconomy.gov API cost?
FuelEconomy.gov API has a free tier with 100 calls / month. Paid plans start at €7.20 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is FuelEconomy.gov API GDPR-compliant?
All requests to FuelEconomy.gov API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/fueleconomy-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/fueleconomy-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/fueleconomy-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/fueleconomy-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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