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API · /slippage-api

Crypto Slippage & Market Impact API

healthy 3,297 Subscribers

What a crypto trade actually costs once it eats into the order book — computed live from Binance's full depth feed (up to 5000 levels per side), no key, nothing stored. Top-of-book price is a fiction for anything but the smallest order: a real market order walks down the book, filling progressively worse levels, and the gap between the quoted price and the realised average fill is slippage. The estimate endpoint takes a pair, a side (buy or sell) and a size — in quote currency (notional, e.g. $250,000) or in base coin (quantity) — walks the live book level by level and returns the average fill price, the slippage versus the mid and versus top-of-book, the price impact (how far the last filled level sits from mid), the number of levels consumed and whether the book even holds enough liquidity to fill. The depth endpoint returns a liquidity profile: top bid/ask, mid, spread and the cumulative bid- and ask-side liquidity sitting within ±0.1%, ±0.25%, ±0.5%, ±1% and ±2% of mid, plus the book imbalance — a one-glance read on how deep and how lopsided a market is. The symbols endpoint lists tradable pairs. This is the execution-cost / market-impact analytics cut for crypto — distinct from the raw exchange order-book feed, from VWAP-on-candles, and from the price, ticker and quote APIs in the catalogue. Pairs are Binance symbols (BTCUSDT) or a coin=BTC&quote=USDT form.

#slippage #market-impact #order-book #execution #crypto #trading #binance
api.oanor.com/slippage-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
373 ms
Server probes · 24h
Subscribers
3,297
active
Total calls
4
last 7 days
status Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 300 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 300 calls/month
  • 2 req/sec
  • Estimate + depth + symbols
  • No credit card
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Starter

€12.87 /month

  • 12,000 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 12,000 calls/month
  • 6 req/sec
  • Full 5000-level depth walk
  • Email support
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Pro

€38.12 /month

  • 75,000 calls / month
  • 18 requests / second
  • Hard cap (429 above quota, no overage)
  • 75,000 calls/month
  • 18 req/sec
  • Execution-cost & TCA pipelines
  • Priority support
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Business

€86.40 /month

  • 400,000 calls / month
  • 45 requests / second
  • Hard cap (429 above quota, no overage)
  • 400,000 calls/month
  • 45 req/sec
  • Trading-desk scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

VWAP & Execution Benchmark API

Live VWAP (volume-weighted average price) and execution-benchmark analytics that trading desks and algos run to judge a fill, computed on demand from the OHLCV candles you pass in — no key, no cache, nothing stored. The vwap endpoint returns the session VWAP, its cumulative curve and where the last price sits relative to it (above, below or at VWAP), using the typical price (high+low+close)/3 weighted by volume. The anchored endpoint returns the VWAP measured from a chosen bar — an anchored VWAP from a swing high, a session open or a news event. The benchmark endpoint scores an execution price against both VWAP and TWAP (time-weighted average price): the slippage in basis points and whether the fill beat the benchmark, separately for a buy or a sell. Works for any market — forex, equities, crypto or commodities — because you supply the candles. This is an execution-analytics engine: it turns price and volume into the benchmark a trader's fill is measured against, distinct from indicator and pattern tools. Computed locally and deterministically, so it is instant and private. Ideal for execution-quality (TCA) reporting, algo-trading back-tests, broker fill analysis and trading dashboards. VWAP uses the typical price (H+L+C)/3. Live, nothing stored. 3 compute endpoints. For raw price feeds use an exchange or FX API.

api.oanor.com/vwap-api

BTSE Exchange API

Live spot market data from BTSE, a global crypto exchange, served straight from its public order books — no key on the data, nothing cached, nothing stored. Look up any market for its last price, best bid/ask and spread, 24h high/low, 24h change and base/quote volume; rank every market for a quote currency by 24h turnover; list the tradable pairs with their base and quote; or pull live order-book depth with the running spread. Markets are addressed BASE-QUOTE (BTC-USD). This is the BTSE venue specifically — a distinct multi-fiat price feed that quotes against the US, Hong Kong, Canadian, New Zealand and Australian dollars plus the pound, euro, Swiss franc, yen and rupee as well as USDT/USDC, ideal for HKD/CAD/CHF/GBP/NZD price discovery and cross-venue arbitrage, separate from the USD/USDT-only exchange APIs in the catalogue.

api.oanor.com/btse-api

Biconomy Exchange API

Live spot market data from Biconomy, a global crypto exchange, served straight from its public order books — no key on the data, nothing cached, nothing stored. Look up any market for its last price, 24h high/low, 24h change and base/quote volume; rank every spot market for a quote currency (USDT, BTC, ETH…) by 24h turnover; list the tradable pairs with their base, quote and precision; or pull live order-book depth with the real best bid/ask and running spread. Markets are addressed as BTC_USDT, with base and quote either side of the underscore. This is the Biconomy venue specifically — a distinct global exchange feed, separate from the other exchange APIs in the catalogue, so cross-venue arbitrage and price-discovery workflows can read each book on its own terms.

api.oanor.com/biconomy-api

Deepcoin Exchange API

Live spot market data from Deepcoin, a global crypto exchange, served straight from its public order books — no key on the data, nothing cached, nothing stored. Look up any market for its last price, best bid/ask and spread, 24h high/low, 24h change and base/quote volume; rank every spot market for a quote currency (USDT, BTC, ETH…) by 24h quote volume; list the tradable instruments with their base, quote and tick/lot size; or pull live order-book depth with the running spread. Markets are addressed OKX-style as BTC-USDT, with base and quote either side of the hyphen. This is the Deepcoin venue specifically — a distinct global exchange feed, separate from the other exchange APIs in the catalogue, so cross-venue arbitrage and price-discovery workflows can read each book on its own terms.

api.oanor.com/deepcoin-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Crypto Slippage & Market Impact API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Crypto Slippage & Market Impact API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Crypto Slippage & Market Impact 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 Crypto Slippage & Market Impact API cost?
Crypto Slippage & Market Impact API has a free tier with 100 calls / month. Paid plans start at €12.87 / 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 Crypto Slippage & Market Impact API GDPR-compliant?
All requests to Crypto Slippage & Market Impact 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/slippage-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/slippage-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/slippage-api/SOME_PATH");
curl_setopt($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/slippage-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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