FirmTape Session API
The Session API from FirmTape — 1 operation(s) for session.
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OpenAPI Specification
openapi: 3.2.0
info:
title: FirmTape SPX Dealer Positioning & Quantitative LAB Session…
description: 'Public SPX session discovery plus the authenticated FirmTape LAB API. LAB develops a saved idea through chat, then backtests and optimizes that idea; the same token runs the OPTIONS strategy tester, which prices an SPX 0DTE structure (up to four legs) across the archived sessions on real quotes and settlement. Neither provides trading signals or investment advice. The order ledger and Geo are separate products with their own specifications: https://firmtape.com/orders/openapi.json and https://firmtape.com/geo/openapi.json.'
version: 1.1.0
contact:
name: FirmTape Support
url: https://firmtape.com/about
email: support@firmtape.com
servers:
- url: https://firmtape.com
description: Production Server
tags:
- name: Session
paths:
/api/session/{day}:
get:
operationId: getArchivedSession
summary: Get public closing measurements for one finished SPX session
description: Returns FirmTape's derived closing summary for a finished session. It does not expose the licensed raw options tape or provide a trading recommendation.
parameters:
- name: day
in: path
required: true
description: Finished SPX trading day
schema:
type: string
format: date
example: '2026-08-28'
responses:
'200':
description: Public derived session summary
content:
application/json:
schema:
type: object
required:
- day
- url
- open
- close
- high
- low
- source
properties:
day:
type: string
format: date
url:
type: string
format: uri
previous_day:
type:
- string
- 'null'
format: date
next_day:
type:
- string
- 'null'
format: date
open:
type: number
close:
type: number
high:
type: number
low:
type: number
vwap_close:
type:
- number
- 'null'
zero_gamma_flip:
type:
- number
- 'null'
call_resistance:
type:
- number
- 'null'
put_support:
type:
- number
- 'null'
atm_iv_open:
type:
- number
- 'null'
net_gamma_percentile:
type:
- number
- 'null'
flip_crossings:
type: integer
source:
type: string
'404':
description: Unknown, live, or unavailable session
tags:
- Session