> ## Documentation Index > Fetch the complete documentation index at: https://docs.joyride.exchange/llms.txt > Use this file to discover all available pages before exploring further. # Get greeks, model price, and probability of profit > Per-instrument option greeks computed by Joyride: Black-76 (r = 0, forward = spot) model price, delta, gamma, theta, vega, probability-of-profit, and the BlockScholes-derived `mark_iv` passthrough. Served entirely from an in-process cache refreshed by a background poller — no upstream call is made per request. Conventions: - All numeric fields are fixed-8 decimal **strings**. - `null` means unknown/stale — `"0.00000000"` is never emitted for an unknown value. Rows whose source inputs (quote `as_of_ms` / oracle spot publish time) are older than the staleness window (default 30s) serve null fields while retaining their last timestamps. - `model_price` is a display-only theoretical value. It is NOT the margin/liquidation-authoritative mark and must never be used as a PnL/margin/liquidation price source. - `rho` is intentionally omitted (convention-dependent, unrendered). - Rows are sorted by `symbol`. Staleness never yields a 5xx — the endpoint returns 200 with null fields. - Adding response fields is backward-compatible; removing or renaming fields is a breaking change. ## OpenAPI ````yaml /_generated/openapi.yaml get /v1/greeks openapi: 3.1.0 info: title: Joyride Core HTTP API version: 0.1.0 description: | HTTP endpoints served by joyride-core v8 components. Decimal money, price, and quantity fields are strings with up to 8 decimal places unless noted otherwise. servers: - url: https://joyride.exchange/api description: Production security: - bearerAuth: [] tags: - name: Public - name: Query - name: Withdrawals - name: Market Data description: Publicly accessible market data. No authentication required. - name: Account description: Account-scoped history and provisioning. Requires a bearer JWT. - name: Referrals description: Referral-code validation and attribution surfaces. - name: AI Chat description: > AI-powered trading assistant. Uses SIWS (Sign In With Solana) authentication and JWT sessions. Returns responses as Server-Sent Events (SSE). paths: /v1/greeks: get: tags: - Market Data summary: Get greeks, model price, and probability of profit description: | Per-instrument option greeks computed by Joyride: Black-76 (r = 0, forward = spot) model price, delta, gamma, theta, vega, probability-of-profit, and the BlockScholes-derived `mark_iv` passthrough. Served entirely from an in-process cache refreshed by a background poller — no upstream call is made per request. Conventions: - All numeric fields are fixed-8 decimal **strings**. - `null` means unknown/stale — `"0.00000000"` is never emitted for an unknown value. Rows whose source inputs (quote `as_of_ms` / oracle spot publish time) are older than the staleness window (default 30s) serve null fields while retaining their last timestamps. - `model_price` is a display-only theoretical value. It is NOT the margin/liquidation-authoritative mark and must never be used as a PnL/margin/liquidation price source. - `rho` is intentionally omitted (convention-dependent, unrendered). - Rows are sorted by `symbol`. Staleness never yields a 5xx — the endpoint returns 200 with null fields. - Adding response fields is backward-compatible; removing or renaming fields is a breaking change. operationId: getBffGreeks parameters: - name: asset in: query required: false description: | Optional base-asset filter. Validated against the canonical configured asset set (`BTC`, `ETH`, `SOL`), case-insensitively; values longer than 64 bytes or outside the set yield 400 `INVALID_ASSET`. A valid asset with no cached rows returns an empty `data` array. schema: type: string maxLength: 64 enum: - BTC - ETH - SOL responses: '200': description: Cached greeks rows (empty array when the cache is empty) content: application/json: schema: type: object properties: data: type: array items: type: object properties: symbol: type: string description: Instrument symbol (quote-pair format) examples: - BTC_USDC-25JUL26-120000-C model_price: type: - string - 'null' description: | BS(spot, K, T, r=0, mark_iv) theoretical price, fixed-8 decimal string. Display-only — never a margin/liquidation price source. mark_iv: type: - string - 'null' description: >- BlockScholes-derived mark IV passthrough (fixed-8 string) delta: type: - string - 'null' description: >- In [-1, 1], sign-consistent with option type (fixed-8 string) gamma: type: - string - 'null' description: Non-negative (fixed-8 string) theta: type: - string - 'null' description: Per-day, non-positive at r = 0 (fixed-8 string) vega: type: - string - 'null' description: Per 1% IV change, non-negative (fixed-8 string) pop: type: - string - 'null' description: >- Long-side probability of profit at expiry, in [0, 1] (fixed-8 string) as_of: type: - integer - 'null' description: >- Unix ms of the OLDEST source input (never request time) computed_at: type: - integer - 'null' description: >- Unix ms the row was last computed; null only when never computed required: - symbol - model_price - mark_iv - delta - gamma - theta - vega - pop - as_of - computed_at required: - data example: data: - symbol: BTC_USDC-25JUL26-120000-C model_price: '1588.21000000' mark_iv: '0.43210000' delta: '0.45120000' gamma: '0.00001200' theta: '-42.10000000' vega: '88.40000000' pop: '0.38000000' as_of: 1753100000123 computed_at: 1753100000500 '400': description: Invalid `asset` filter (the input is never reflected back) content: application/json: schema: type: object properties: error: type: string const: INVALID_ASSET message: type: string const: asset must be one of the listed base assets required: - error - message security: [] components: securitySchemes: bearerAuth: type: http scheme: bearer description: >- SIWS-issued JWT. Admin commands require the `admin` role, `admin:*`, or the exact `admin:` scope; admin reads use their documented read scope. ````