Feed API

Nunchi publishes public read-only feeds for two related surfaces:

• SWP feeds for funding-rate markets such as BTCSWP, HYPESWP, ETHCSWP, and SPCXSWP.
• ISFR for the composite internet funding-rate benchmark and its sub-indices.

These endpoints are public read-only APIs. They do not place orders and do not require trading authentication.

Feed Directory

Feed	Market or index	Public base URL	Status
BTCSWP	yex:BTCSWP	https://cfi-api-production.up.railway.app	Live
HYPESWP	HYPESWP	https://hypeswp-api-production.up.railway.app	Live
ETHCSWP	ETHCSWP	https://ethcswp-api-production.up.railway.app	Live
SPCXSWP	SPCXSWP	https://spcx-swp-api-production.up.railway.app	Live feed, market coming soon
ISFR	Composite secured funding benchmark	https://house.nunchi.trade/isfr	Live dashboard and API mounted under /isfr

For browser apps, prefer same-origin proxies on nunchi.trade when available:

Proxy endpoint	Upstream feed
GET /api/feeds/btcswp/latest	BTCSWP latest tick
GET /api/feeds/btcswp/stream	BTCSWP SSE stream
GET /api/feeds/hypeswp/latest	HYPESWP latest tick
GET /api/feeds/hypeswp/stream	HYPESWP SSE stream
GET /api/feeds/ethcswp/latest	ETHCSWP latest tick
GET /api/feeds/ethcswp/stream	ETHCSWP SSE stream
GET /api/feeds/spcxswp/latest	SPCXSWP latest tick
GET /api/feeds/spcxswp/stream	SPCXSWP SSE stream

SWP Feeds

Use these APIs when you need the current oracle price or streaming ticks for a funding-rate market.

Health

GET /healthz

Example response:

{ "status": "ok" }

Latest Tick

GET /api/latest

/latest is also supported for compatibility.

Example:

curl https://cfi-api-production.up.railway.app/api/latest

Example response:

{
  "oracle_px": "74942.980893"
}

Streaming Ticks

GET /api/stream
Accept: text/event-stream

/stream is also supported for compatibility. Each tick is sent as event: price.

Browser example:

const events = new EventSource("https://cfi-api-production.up.railway.app/api/stream");

events.addEventListener("price", (event) => {
  const tick = JSON.parse(event.data);
  console.log(tick.oracle_px);
});

SWP Response Fields

Field	Meaning
oracle_px	Current oracle price for the SWP feed. Use this as the headline price.

SWP Feed Details

BTCSWP

BTCSWP is the live BTC excess-funding market on YEX.

Property	Value
Market	yex:BTCSWP
Instrument	BTCSWP-USDYP
Reference asset	Core Hyperliquid BTC
Public feed	https://cfi-api-production.up.railway.app/api/latest
Stream	https://cfi-api-production.up.railway.app/api/stream

See BTCSWP for market mechanics and oracle parameters.

HYPESWP

HYPESWP publishes an SWP oracle price for HYPE funding.

Property	Value
Reference asset	Core Hyperliquid HYPE
Public feed	https://hypeswp-api-production.up.railway.app/api/latest
Stream	https://hypeswp-api-production.up.railway.app/api/stream

ETHCSWP

ETHCSWP publishes an SWP oracle price for ETH funding.

Property	Value
Reference asset	Core Hyperliquid ETH
Public feed	https://ethcswp-api-production.up.railway.app/api/latest
Stream	https://ethcswp-api-production.up.railway.app/api/stream

SPCXSWP

SPCXSWP publishes an SWP oracle price for SPCX funding. The feed is public while the market remains launch-gated.

Property	Value
Reference asset	xyz:SPCX
Public feed	https://spcx-swp-api-production.up.railway.app/api/latest
Stream	https://spcx-swp-api-production.up.railway.app/api/stream

ISFR Feed

The Implied Secured Funding Rate (ISFR) feed publishes a composite benchmark across four source classes: lending, structured yield, funding, and staking. It is intended for dashboards, models, risk systems, and yield market pricing.

Public dashboard:

https://house.nunchi.trade/isfr

Public API base:

https://house.nunchi.trade

ISFR Health

GET /isfr/health

Current ISFR

GET /isfr/v1/isfr/current

Example response shape:

{
  "isfr_bps": 690,
  "rate": 0.06895,
  "rate_formatted": "6.90%",
  "components": {
    "lending": 620,
    "structured": 710,
    "funding": 1240,
    "staking": 320
  },
  "confidence": 0.876,
  "class_weights_effective": {
    "lending": 0.6,
    "structured": 0.25,
    "funding": 0.1,
    "staking": 0.05
  },
  "timestamp": "2026-04-14T11:42:00+00:00",
  "version": "v3.0"
}

ISFR History

GET /isfr/v1/isfr/history?days=30

ISFR Sub-Indices

GET /isfr/v1/isfr/subindex/{class_name}

class_name must be one of lending, structured, funding, or staking.

ISFR Sources

GET /isfr/v1/isfr/sources

ISFR OHLC

GET /isfr/v1/isfr/ohlc?days=180&interval=1D

Supported intervals are 1H, 4H, 1D, and 1W.

ISFR Methodology Summary

The ISFR v3.0 composite uses two levels:

1. Within each source class, rates are aggregated with a TVL-weighted median and source confidence.
2. Across source classes, the default weights are 60% lending, 25% structured, 10% funding, and 5% staking.

If every source in a class fails, that class's weight is redistributed across the remaining healthy classes. The composite continues to publish as long as at least one class has a valid source.

See ISFR Index for the product explanation and methodology context.