The Appointment Fit API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for appointment fit.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Appointment Fit 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: Appointment Fit
paths:
/api/v1/appointment-fit:
post:
operationId: appointment_fit
summary: 'Does this appointment fit: opening hours in the venue''s zone, closed days…'
description: 'Checks one proposed appointment (instant + duration) against a venue''s local opening hours per weekday, closed dates or a named holiday calendar, up to 500 existing bookings with a buffer on each side, and a minimum notice measured from a caller-supplied asOf; every violated rule is returned as a witness with the conflicting booking or hour block. Local hours are resolved in the venue''s IANA zone so DST days are correct. It does not search for free slots (use slot-intersect), know staff or resource capacity, or read the clock.
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/appointment-fit
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- start
- durationMinutes
- timeZone
- hours
properties:
start:
type: string
pattern: ^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}(:\d{2}(\.\d{1,9})?)?(Z|z|[+-]\d{2}:?\d{2})$
maxLength: 36
durationMinutes:
type: integer
minimum: 1
maximum: 1440
timeZone:
type: string
pattern: ^[A-Za-z][A-Za-z0-9_+-]*(/[A-Za-z0-9_+-]+){0,2}$
maxLength: 64
description: Venue zone in which hours apply.
hours:
type: array
minItems: 1
maxItems: 28
items:
type: object
required:
- days
- open
- close
properties:
days:
type: array
minItems: 1
maxItems: 7
items:
type: integer
minimum: 0
maximum: 6
description: 0=Sunday..6=Saturday.
open:
type: string
pattern: ^([01]\d|2[0-3]):[0-5]\d$
maxLength: 5
close:
type: string
pattern: ^([01]\d|2[0-3]):[0-5]\d$
maxLength: 5
description: Exclusive end, local; must be after open (no overnight blocks).
calendar:
type: string
enum:
- us-federal
- us-federal-reserve
- nyse
- us-equities-settlement
- uk-england-and-wales
- uk-scotland
- uk-northern-ireland
- weekends-only
- caller
description: Optional named holiday calendar for closed days (unsupported outside its range). Without it only holidays/weekend you list apply; hours decide the weekdays.
holidays:
type: array
maxItems: 400
items:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
maxLength: 10
description: Extra non-business dates YYYY-MM-DD (company closures, a calendar we do not carry).
weekend:
type: array
maxItems: 6
items:
type: integer
minimum: 0
maximum: 6
description: Ignored for hours; with a named calendar only its holidays are used.
bookings:
type: array
maxItems: 500
items:
type: object
required:
- start
- end
properties:
start:
type: string
pattern: ^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}(:\d{2}(\.\d{1,9})?)?(Z|z|[+-]\d{2}:?\d{2})$
maxLength: 36
end:
type: string
pattern: ^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}(:\d{2}(\.\d{1,9})?)?(Z|z|[+-]\d{2}:?\d{2})$
maxLength: 36
bufferMinutes:
type: integer
minimum: 0
maximum: 1440
description: Required gap on each side of the appointment.
minNoticeMinutes:
type: integer
minimum: 0
maximum: 525600
description: Needs asOf.
asOf:
type: string
pattern: ^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}(:\d{2}(\.\d{1,9})?)?(Z|z|[+-]\d{2}:?\d{2})$
maxLength: 36
description: Reference instant for minimum notice.
example:
start: '2026-11-09T15:00:00Z'
durationMinutes: 45
timeZone: America/New_York
hours:
- days:
- 1
- 2
- 3
- 4
- 5
open: 09:00
close: '17:00'
bookings:
- start: '2026-11-09T14:00:00Z'
end: '2026-11-09T14:50:00Z'
bufferMinutes: 15
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.'
startLocal:
type: string
endLocal:
type: string
withinHours:
type: boolean
closedDay:
type: boolean
conflicts:
type: array
items:
type: object
properties:
index:
type: integer
startUtc:
type: string
endUtc:
type: string
noticeMinutes:
type: integer
reason:
type: string
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:
- Appointment Fit
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