SimpleFunctions Developer Manual

The market-detail endpoint returns one market’s complete profile in a single round-trip: live price, top of book and optional 5-level depth, SimpleFunctions indicators, regime label, cross-venue counterpart, attached thesis edges, follow-up nextActions, and canonical URLs. A sibling endpoint returns a 7-day rolling history of that market’s indicators and regime snapshots.

Endpoints

GET /api/public/market/{ticker}
GET /api/public/market/{ticker}/history

Auth: none. Both endpoints are public, cached at the edge.

Identifiers

Format	Example	Notes
Kalshi raw ticker	`KXFEDDECISION-26DEC10-T0`	Uppercase + hyphens.
Polymarket conditionId	`0x5db999fad322cea2918a3681...`	66-char hex.
Polymarket numeric id	`12345`	Decimal id. Accepted but conditionId preferred.

UUIDs from the deprecated external_markets table return 410 Gone so search engines de-index those URLs faster than they would for a 404.

Detail

GET /api/public/market/{ticker}

curl "https://simplefunctions.dev/api/public/market/KXFEDDECISION-26DEC10-T0"

sf inspect KXFEDDECISION-26DEC10-T0 --json

const res = await fetch(
  `https://simplefunctions.dev/api/public/market/${ticker}?depth=true`
)
const market = await res.json()

Query parameters

Param	Type	Default	Notes
`depth`	boolean	`false`	When `true`, include 5-level orderbook depth (`bidLevels`, `askLevels`).
`refresh`	boolean	`false`	Force a fresh regime computation (~LLM cost). Requires `Authorization: Bearer sf_live_xxx` — otherwise `401`.
`cv_preset`	string	`detail`	Cross-venue match preset. Other presets exist; `detail` is the default.
`cv_min_conf`	number	`0.60`	Min cross-venue match confidence (0–1).
`cv_max_dt_days`	number	—	Max close-time delta (days) for cross-venue match.
`nextActions`	`off`	—	When `off`, omit the `nextActions` block.

The endpoint streams a single response — there is no pagination. Cache: Cache-Control: public, s-maxage=60, stale-while-revalidate=120.

Response shape

Show Full response

{
  "ticker": "KXFEDDECISION-26DEC10-T0",
  "venue": "kalshi",
  "title": "Will the Fed cut rates at the December meeting?",
  "description": "Resolves YES if the FOMC announces a rate cut at the December 10, 2026 meeting.",
  "price": 0.42,
  "bestBid": 0.41,
  "bestAsk": 0.43,
  "spread": 0.02,
  "volume": 124500,
  "volume24h": 8200,
  "openInterest": 45000,
  "status": "active",
  "closeTime": "2026-12-10T19:00:00.000Z",
  "category": "financial",
  "liquidityScore": "high",
  "slug": "will-the-fed-cut-rates-at-the-december-meeting",
  "bidLevels": [{ "price": 0.41, "size": 1200 }],
  "askLevels": [{ "price": 0.43, "size": 700 }],
  "edges": [
    {
      "thesisTitle": "Fed will cut by Dec",
      "thesisSlug": "fed-will-cut-by-dec",
      "thesisPrice": 0.55,
      "edge": 13,
      "direction": "buy_yes",
      "firstDetectedAt": "2026-04-23T14:00:00.000Z",
      "firstDetectedPrice": 0.39
    }
  ],
  "indicators": {
    "tauDays": 219,
    "iyYes": 320,
    "iyNo": null,
    "cri": 1.18,
    "ee": 13,
    "eeSource": "thesis",
    "las": 0.05,
    "cvr": 1.02,
    "overround": 0.03,
    "rv": null,
    "vr": null,
    "iar": null,
    "adjIy": 280,
    "daysToEvent": 219,
    "expectedVr": null,
    "residualVr": null,
    "hasThesis": true,
    "hasOrderbook": true,
    "lastComputedAt": "2026-05-05T17:45:00.000Z"
  },
  "crossVenue": {
    "ticker": "0x5db999fad322cea2918a3681...",
    "venue": "polymarket",
    "title": "Fed cuts rates at December 2026 meeting?",
    "confidenceScore": 0.86,
    "closeTimeDeltaSec": 0,
    "matchMethod": "title_similarity",
    "isArbReady": true,
    "priceCents": 44,
    "indicators": {
      "ee": 11,
      "las": 0.04,
      "cvr": 1.02,
      "tauDays": 219,
      "iyYes": 305,
      "iyNo": null
    }
  },
  "regime": {
    "score": 0.21,
    "label": "maker",
    "signals": {
      "spreadPct": 0.046,
      "depthChange1h": null,
      "volumeZscore": -0.3,
      "flowImbalance": 0.05,
      "crossVenueGap": -0.02,
      "catalystType": null,
      "catalystHours": null,
      "sfEdgeCents": 13,
      "sfEdgeDirection": "buy_yes",
      "observability": "high",
      "eventType": "data_release",
      "asPrior": 0.18
    },
    "computedAt": "2026-05-05T17:48:12.000Z",
    "fresh": false
  },
  "pageUrl": "https://simplefunctions.dev/markets/will-the-fed-cut-rates-at-the-december-meeting",
  "apiUrl": "https://simplefunctions.dev/api/public/market/KXFEDDECISION-26DEC10-T0",
  "inspectUrl": "https://simplefunctions.dev/api/agent/inspect/KXFEDDECISION-26DEC10-T0",
  "fetchedAt": "2026-05-05T18:00:00.000Z",
  "nextActions": {
    "inspect": [
      { "description": "Full dossier for ...", "method": "GET", "url": "https://simplefunctions.dev/api/agent/inspect/..." }
    ],
    "related": [
      { "description": "Contagion — lagging siblings", "method": "GET", "url": "https://simplefunctions.dev/api/public/contagion?window=6h" },
      { "description": "Top edges across theses", "method": "GET", "url": "https://simplefunctions.dev/api/edges" },
      { "description": "Salience snapshot", "method": "GET", "url": "https://simplefunctions.dev/api/agent/world" }
    ]
  }
}

Field reference

Field	Type	Notes
`ticker`, `venue`, `title`, `description`	string	Identity. `description` may be empty.
`price`	number	Current YES probability `[0, 1]`.
`bestBid`, `bestAsk`, `spread`	number	Top of book and `bestAsk - bestBid`.
`volume`, `volume24h`, `openInterest`	number	Traded volume / open interest. `volume24h` is enriched from `marketIndicators` when the venue API returns 0.
`status`	string	`active`, `closed`, `settled`.
`closeTime`	ISO 8601	When the market closes.
`category`	string	Kalshi-supplied category. Polymarket markets do not carry one.
`liquidityScore`	`high` \| `medium` \| `low`	Coarse bucket from spread + depth.
`slug`	string	Canonical SEO slug used by `/markets/{slug}`.
`bidLevels`, `askLevels`	`Array<{price, size}>`	5 levels each, only present with `depth=true`.
`edges[]`	array	Thesis-derived mispricings touching this ticker — see `/api-reference/thesis`.
`indicators`	object \| null	Bundle of computed indicators (see below). `null` if the ticker isn’t yet in the cached set.
`crossVenue`	object \| null	Counterpart on the other venue when SimpleFunctions has matched a pair. `null` otherwise.
`regime`	object \| null	Adverse-selection score + label + raw signals. May be re-computed when stale.
`pageUrl`, `apiUrl`, `inspectUrl`	string	Canonical absolute URLs for the same market.
`fetchedAt`	ISO 8601	When this response was assembled.
`nextActions`	object	Pre-built follow-up URLs (`inspect`, `related`). Omit with `nextActions=off`.

Indicators bundle

Returned in indicators when the ticker is in marketIndicators. All numeric fields are nullable.

Field	Meaning
`tauDays`	Days to expiry.
`iyYes`, `iyNo`	Implied annualized yield (%) for each side. Suppressed (set to `null`) when `tauDays < 1` or `	IY	> 1000%` to prevent display blow-up on intraday markets.
`cri`	Cliff risk = `max(p, 1-p) / min(p, 1-p)`.
`ee`	Expected edge in cents. `eeSource` documents the origin (`thesis` or `regime`).
`las`	Liquidity-adjusted spread = `spread / mid`.
`cvr`	Cross-venue ratio.
`overround`	Event overround when this ticker is part of a multi-leg event.
`rv`, `vr`, `iar`	Realized variance, variance ratio, implied/actual ratio (where available).
`adjIy`	IY adjusted for liquidity and overround.
`daysToEvent`, `expectedVr`, `residualVr`	Catalyst proximity and variance fit.
`hasThesis`, `hasOrderbook`	Booleans — whether SimpleFunctions currently has a thesis edge or a cached orderbook for this ticker.
`lastComputedAt`	When the bundle was last refreshed.

Regime block

The regime block reports SimpleFunctions’s adverse-selection scoring (0–1) plus the label maker, taker, or neutral. The cached snapshot is served when fresh (≤15 min old). When stale or when the live spread differs from the cached spread by >50%, the server re-computes on demand and returns fresh: true. With ?refresh=true (auth required), the server always re-computes.

Errors

Status	Body	Cause
`400`	`{ error: "Invalid ticker" }`	Empty or under 3 chars.
`401`	`{ error: "refresh=true requires API key" }`	`?refresh=true` without a Bearer key.
`404`	`{ error: "Market not found" }`	Venue API returned 404/422.
`410`	`{ error: "This market ID format is no longer supported" }`	Legacy UUID — cached for 24h to accelerate de-indexing.
`500`	`{ error: "Failed to fetch market", detail: "..." }`	Upstream venue error.

History

GET /api/public/market/{ticker}/history

7-day rolling window of two parallel time-series for the ticker:

curl "https://simplefunctions.dev/api/public/market/KXFEDDECISION-26DEC10-T0/history"

Show Response shape

{
  "ticker": "KXFEDDECISION-26DEC10-T0",
  "windowDays": 7,
  "indicatorHistory": [
    { "at": "2026-04-29T00:00:00.000Z", "price": 39, "delta": 0, "iy": 312.4, "cri": 1.21 },
    { "at": "2026-04-29T01:00:00.000Z", "price": 40, "delta": 1, "iy": 309.7, "cri": 1.20 }
  ],
  "regimeHistory": [
    { "at": "2026-04-29T00:00:00.000Z", "score": 0.22, "label": "maker", "spreadCents": 2, "bidDepthUsd": 12000, "askDepthUsd": 7000, "volume24h": 4200 }
  ],
  "indicatorCount": 168,
  "regimeCount": 28
}

Field	Notes
`windowDays`	Always 7 (server-side).
`indicatorHistory[]`	From `marketIndicatorHistory`, oldest → newest. Up to 2,000 rows.
`regimeHistory[]`	From `marketRegimeSnapshots`, oldest → newest. Up to 500 rows.
`indicatorCount`, `regimeCount`	How many rows the underlying tables actually hold for this ticker (after limits).

Both arrays are empty for tickers outside the warm-regime cron’s top-500 coverage. Frontends should handle the empty state — most non-top tickers return indicatorHistory: [] and a populated regimeHistory, or vice versa, depending on which cron has touched them. Cache: Cache-Control: s-maxage=600, stale-while-revalidate=1200. Errors return 400 ticker required or 500 history failed.

CLI equivalents

sf inspect <ticker> --json
sf inspect <ticker> --depth --json
sf book <ticker> --json

sf inspect calls /api/agent/inspect/{ticker} for an agent-shaped dossier; sf book hits /api/public/market/{ticker}?depth=true directly.

Indicators

What iy, cri, ee, las, cvr, tauDays mean.

Market regime

Adverse-selection score, label, signal interpretation.

Inspect ticker

Agent-shaped variant: /api/agent/inspect/{ticker}.

Real-time data

Streaming orderbook / candles / trades for the same ticker over WS.

Start with the API

Public market APIs

Authenticated APIs

Tools and events

Market Detail

Endpoints

Identifiers

Detail

Query parameters

Response shape

Field reference

Indicators bundle

Regime block

Errors

History

CLI equivalents

See also

Indicators

Market regime

Inspect ticker

Real-time data

​Endpoints

​Identifiers

​Detail

​Query parameters

​Response shape

​Field reference

​Indicators bundle

​Regime block

​Errors

​History

​CLI equivalents

​See also

Indicators

Market regime

Inspect ticker

Real-time data

Endpoints

Identifiers

Detail

Query parameters

Response shape

Field reference

Indicators bundle

Regime block

Errors

History

CLI equivalents

See also