The Fiscal Period API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for fiscal period.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Fiscal Period API
version: 2.0.0
description: Pay-per-call agents settled in USDC on Base via x402. Every response carries a signed provenance envelope.
contact:
name: WritersLogic
url: https://writerslogic.com/agents
email: agents@writerslogic.com
servers:
- url: https://agents.writerslogic.com
tags:
- name: Fiscal Period
paths:
/api/v1/fiscal-period:
post:
operationId: fiscal_period
summary: 'Fiscal year, quarter and period for a date: month-aligned or 52/53-week (4-4-5…'
description: 'Maps up to 100 dates to a fiscal year, quarter, period and week for a caller-defined fiscal calendar: a month-aligned year (starts on day 1 of a named month) or a 52/53-week year ending on a given weekday last in or closest to a month end, in a 4-4-5, 4-5-4 or 5-4-4 pattern with the 53rd week appended to the final period; detects 53-week years and checks an asserted fiscal year, quarter or period. You must state how fiscal years are labelled (by the calendar year they start or end in). It carries no company''s calendar and does not know which convention a company uses; Retail and corporate calendars differ in those parameters.
Price: 0.005 USDC on Base (x402).'
x-x402-price-usdc: '0.005'
x-x402-amount: '5000'
x-payment-info:
protocols:
- x402
price:
mode: fixed
currency: USD
amount: '0.005'
x-audience: business
x-sample-url: https://agents.writerslogic.com/api/v1/samples/fiscal-period
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- type
- yearLabel
- items
properties:
type:
type: string
enum:
- month-aligned
- 52-53-week
yearLabel:
type: string
enum:
- start
- end
description: 'start: the fiscal year is named for the calendar year it begins in. end: for the calendar year it ends in (US federal FY2027 begins 2026-10-01).'
startMonth:
type: integer
minimum: 1
maximum: 12
description: 'month-aligned: month in which the fiscal year starts, on day 1.'
endWeekday:
type: integer
minimum: 0
maximum: 6
description: '52-53-week: weekday the year ends on, 0=Sunday.'
endMonth:
type: integer
minimum: 1
maximum: 12
description: '52-53-week: month near whose end the year ends.'
endRule:
type: string
enum:
- last
- closest
description: '52-53-week: last endWeekday in endMonth, or the endWeekday closest to endMonth''s last day.'
pattern:
type: string
enum:
- 4-4-5
- 4-5-4
- 5-4-4
description: '52-53-week: weeks per period within each quarter.'
items:
type: array
minItems: 1
maxItems: 100
items:
type: object
required:
- date
properties:
date:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
maxLength: 10
claimedFiscalYear:
type: integer
minimum: 1000
maximum: 3000
claimedQuarter:
type: integer
minimum: 1
maximum: 4
claimedPeriod:
type: integer
minimum: 1
maximum: 12
example:
type: month-aligned
yearLabel: end
startMonth: 10
items:
- date: '2026-10-01'
claimedFiscalYear: 2027
- date: '2026-09-30'
responses:
'200':
description: Paid result with provenance
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
status:
type: string
enum:
- pass
- fail
- unknown
- unsupported
description: 'pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass.'
items:
type: array
items:
type: object
properties:
index:
type: integer
date:
type: string
fiscalYear:
type: integer
quarter:
type: integer
period:
type: integer
week:
type: integer
periodStart:
type: string
periodEnd:
type: string
fiscalYearStart:
type: string
fiscalYearEnd:
type: string
weeksInYear:
type: integer
witnesses:
type: array
items:
type: object
properties:
ruleId:
type: string
detail:
type: string
path:
type: string
description: JSON pointer or dotted path into the input.
offset:
type: integer
index:
type: integer
expected:
description: What the rule required.
actual:
description: What the input had.
versions:
type: object
description: Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile).
limits:
type: array
items:
type: string
deterministic:
type: boolean
description: 'Always true: pure code, no model.'
_provenance:
type: object
description: C2PA-aligned manifest and W3C VC 2.0 (eddsa-jcs-2022) issued by the hub DID; verify at POST /api/v1/verify-provenance
required:
- data
- _provenance
'400':
description: Invalid request (no payment consumed)
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
'401':
description: Invalid X-API-KEY
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
'402':
description: Payment required or invalid
content:
application/json:
schema:
type: object
description: x402 v2 PaymentRequired (also base64 in the PAYMENT-REQUIRED header)
properties:
x402Version:
type: integer
error:
type: string
code:
type: string
resource:
type: object
accepts:
type: array
items:
type: object
extensions:
type: object
'502':
description: Upstream failure; the payment is released or not settled
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
tags:
- Fiscal Period
components:
securitySchemes:
x402:
type: apiKey
in: header
name: PAYMENT-SIGNATURE
description: x402 v2 payment payload (base64) sent after a 402 challenge
apiKey:
type: apiKey
in: header
name: X-API-KEY