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healthyKronos Crypto Data & Forecasts.
Realized volatility for 16 crypto assets (BTC/ETH/SOL/BNB/XRP/DOGE/ADA/AVAX/LINK/DOT/LTC/TRX/BCH/ATOM/NEAR/APT): 7-day, 30-day, and 90-day annualized realized vol using three estimators (close-to-close, Parkinson, Garman-Klass) from Binance daily OHLC closed candles only. Essential for risk management, position sizing, and options pricing. Pay-per-call via x402.
Payment requirements / accepts[]
2 options
| State | Network | Scheme | Atomic amount | Asset | payTo / untrusted |
|---|---|---|---|---|---|
| inactive | eip155:8453 | exact | 10000 | 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 | 0x36038e1d712c5e39f35952164ec58ec2b96caee7 |
| active | eip155:8453 | exact | 20000 | 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 | 0x36038e1d712c5e39f35952164ec58ec2b96caee7 |
All advertised payment options are stored. Base (`eip155:8453`) is the operational network for ranking and canaries; non-Base options remain visible for transparency.
Probe evidence
1 recent
healthy 2026-08-13 00:45:01 UTC GET · HTTP 402 · 63ms · accepts 1 · base 1 ok
Accepts snapshot
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"paymentFlow": null,
"raw": {
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]
PaymentRequired raw
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}
],
"error": "Payment required",
"extensions": {
"bazaar": {
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},
"output": {
"example": {
"as_of": "2026-07-02T10:00:00.000Z",
"asset": "BTC-USD",
"disclaimer": "Realized volatility from Binance daily OHLC. Historical; not a forecast. Not financial advice.",
"note": "All estimates are annualized realized volatility using closed daily candles. Annualized by sqrt(252) trading-day convention.",
"percentile_context": [
{
"current_vol": 0.48,
"estimator": "parkinson",
"is_window_high": false,
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"max": 1.05,
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{
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"min": 0.28,
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"vol_window": "30d"
}
],
"source": "Binance daily klines (closed candles only)",
"symbol": "BTCUSDT",
"term_structure": [
{
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"close_to_close": 0.54,
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"note": "annualized realized volatility",
"parkinson": 0.48,
"percentile": 0.72,
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{
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"close_to_close": 0.62,
"garman_klass": 0.61,
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"note": "annualized realized volatility",
"parkinson": 0.58,
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Response headers
{
"age": "0",
"cache-control": "public, max-age=0, must-revalidate",
"content-type": "application/json",
"date": "Thu, 13 Aug 2026 00:45:01 GMT",
"payment-required": "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",
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"strict-transport-security": "max-age=63072000",
"transfer-encoding": "chunked",
"x-matched-path": "/api/v1/volatility/[asset]",
"x-vercel-cache": "MISS",
"x-vercel-id": "iad1::iad1::jm482-1786581900956-0852247a3ce5"
}
Response body
{
"accepts": [
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"amount": "20000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
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"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0x36038e1d712c5e39f35952164ec58ec2b96caee7",
"scheme": "exact"
}
],
"error": "Payment required",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"pathParams": {},
"queryParams": {},
"type": "http"
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"output": {
"example": {
"as_of": "2026-07-02T10:00:00.000Z",
"asset": "BTC-USD",
"disclaimer": "Realized volatility from Binance daily OHLC. Historical; not a forecast. Not financial advice.",
"note": "All estimates are annualized realized volatility using closed daily candles. Annualized by sqrt(252) trading-day convention.",
"percentile_context": [
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"max": 0.98,
"min": 0.28,
"percentile": 0.81,
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"vol_window": "30d"
}
],
"source": "Binance daily klines (closed candles only)",
"symbol": "BTCUSDT",
"term_structure": [
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"best_estimator": "parkinson",
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"garman_klass": 0.51,
"n_candles": 7,
"note": "annualized realized volatility",
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"percentile": 0.72,
"vol_regime": "elevated",
"window": "7d"
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{
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"n_candles": 30,
"note": "annualized realized volatility",
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"mimeType": "application/json",
"serviceName": "Kronos Crypto Data & Forecasts",
"tags": [
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"realized-volatility",
"statistical",
"ai-agents",
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"url": "https://kronossignals.com/api/v1/volatility/btc"
},
"x402Version": 2
}
Request headers
{
"accept": "*/*",
"user-agent": "Fetch402Bot/0.1 (+https://fetch402.com/crawler; contact: crawler@fetch402.com)"
}
Machine contract
Schemas.
InputJSON
{}
OutputJSON
{}