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API · /gasfees-api

Multi-Chain Gas Fees API

healthy 4,116 Subscribers

Live multi-chain EVM gas-fee oracle — the gas estimate every wallet, bridge and dApp needs — computed straight from each network's public JSON-RPC node. Using EIP-1559 fee history it derives the next block's base fee and slow, standard and fast priority-fee tiers from the recent reward percentiles, and returns per tier the priority fee, the suggested max fee and the resulting total gas price, all in gwei. It also estimates the cost of a transaction — a plain transfer or any gas limit you pass — in the chain's native coin. Supports Ethereum, Polygon, BSC, Arbitrum, Optimism, Base and Avalanche. Live, no key, no cache. Distinct from price, market-cap and on-chain TVL APIs — this is the real-time gas-price layer.

#gas-fees #crypto #ethereum #evm #eip-1559 #gwei #web3 #on-chain
api.oanor.com/gasfees-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
127 ms
Server probes · 24h
Subscribers
4,116
active
Total calls
24
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 15,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 15k calls/month
  • 5 req/sec
  • All endpoints
  • No credit card
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Starter

€10.00 /month

  • 200,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 200k calls/month
  • 15 req/sec
  • Email support
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Pro

€29.00 /month

  • 1,000,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1M calls/month
  • 40 req/sec
  • Priority support
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Scale

€69.00 /month

  • 5,000,000 calls / month
  • 120 requests / second
  • Hard cap (429 above quota, no overage)
  • 5M calls/month
  • 120 req/sec
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Crypto Derivatives Exchanges API

Live ranking and directory of crypto derivatives venues — the platforms that run perpetual and futures markets — served from the public CoinGecko feed with no key and nothing cached. This is a venue-level view of the derivatives market, distinct from spot-exchange directories, per-contract open-interest feeds and single-exchange tickers: it ranks the derivatives platforms themselves. The exchanges endpoint returns the venues ranked by open interest (or by 24-hour volume), each with its open interest in BTC, 24-hour derivatives volume in BTC, the number of perpetual and futures pairs it lists, its country and the year it was established — so one call tells you who the biggest derivatives venues are and how concentrated open interest is. The exchange endpoint returns a single venue's full profile by id. The list endpoint returns every derivatives-exchange id and name for lookup and autocomplete. Everything is read live from CoinGecko on each request, nothing stored beyond a short protective cache. Ideal for derivatives dashboards, open-interest and market-structure analytics, venue comparison and trading tools. Live, no key. 3 endpoints. For per-contract funding and open-interest history use a derivatives or open-interest API.

api.oanor.com/derivativesexchanges-api

Crypto.com Exchange API

Live spot market data from the Crypto.com Exchange, one of the largest global retail crypto venues and the heart of the CRO ecosystem, served straight from its public API with no key and nothing cached. The ticker endpoint returns a market's last price, best bid and ask, the spread, 24-hour high and low, 24-hour change and base and quote volume. The tickers endpoint returns every spot market for a quote currency ranked by 24-hour quote volume, so one call gives you the most-traded pairs on the venue. The instruments endpoint lists the tradable spot pairs with their price and quantity tick sizes and decimal precision. The book endpoint returns live order-book depth — every bid and ask level with price, amount and order count, plus the best bid/ask and spread. Everything is read live from Crypto.com on each request, nothing stored; perpetual contracts are excluded so you get clean spot data. A distinct global venue, separate from the other exchange feeds on the marketplace. Ideal for trading bots, price tickers, arbitrage scanners, portfolio trackers and market dashboards. Live, no key. 4 spot endpoints. For perpetuals or candles use a derivatives or OHLC API.

api.oanor.com/cryptocom-api

Crypto Trending API

What the crypto market is searching for right now, served live from the public CoinGecko trending feed with no key. This is hype and attention data — distinct from market-cap rankings, exchange tickers and DeFi feeds — surfacing the coins, NFT collections and categories with the biggest spike in search interest over the last 24 hours. The coins endpoint returns the trending coins ranked by search popularity, each with its live USD price, 24-hour change, market cap, 24-hour volume, market-cap rank and BTC price. The nfts endpoint returns the trending NFT collections with floor price (native and display), 24-hour floor change and 24-hour volume. The categories endpoint returns the trending narratives and sectors with market cap, volume and 24-hour change. Trending means ranked by CoinGecko search popularity, so rank 1 is the single most-searched asset of the moment — exactly the signal traders, bots and dashboards use to catch a move early. Read live from CoinGecko, nothing stored beyond a short protective cache. Ideal for crypto dashboards, trading bots, sentiment and hype trackers, and discovery feeds. Live, no key. 3 trending endpoints. For full price history use an OHLC or exchange API.

api.oanor.com/cryptotrending-api

Bitvavo API

Live spot market data from Bitvavo, the largest retail crypto exchange in the Netherlands and one of the highest-volume euro venues in Europe — served straight from its public API, no key, nothing cached. Get a market's last price, best bid/ask, 24h high/low, open, 24h change and base/quote volume (in euro, USDT or Bitcoin); rank every market for a quote currency by 24h quote volume; list trading pairs with status, order limits and precision; and read live market depth. A distinct European / euro venue, separate from other exchange feeds. Markets are BASE-QUOTE (e.g. BTC-EUR).

api.oanor.com/bitvavo-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Multi-Chain Gas Fees API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Multi-Chain Gas Fees API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Multi-Chain Gas Fees 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 Multi-Chain Gas Fees API cost?
Multi-Chain Gas Fees API has a free tier with 100 calls / month. Paid plans start at €10.00 / 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 Multi-Chain Gas Fees API GDPR-compliant?
All requests to Multi-Chain Gas Fees 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/gasfees-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/gasfees-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/gasfees-api/SOME_PATH");
curl_setopt($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/gasfees-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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