The Booking Change Penalty API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for booking change penalty.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Booking Change Penalty…
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: Booking Change Penalty
paths:
/api/v1/booking-change-penalty:
post:
operationId: booking_change_penalty
summary: Which cancellation or change tier applies at this moment, and what does it cost?
description: 'Given a booking start, the moment of change, the booking amount and a tiered policy whose deadlines are either elapsed hours before start (''48 hours'') or local calendar days at a local time (''18:00 the day before'' in the venue''s zone, DST-correct), returns the applicable tier, its deadline instants, the penalty in minor units under your stated rounding, and when the next tier begins; checks an asserted penalty. A change exactly at a deadline is still on time. It carries no airline, hotel or marketplace policy: you supply the tiers. Penalties are percent of amount (basis points) or a fixed minor amount, capped at the booking amount; no tax or FX.
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/booking-change-penalty
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- startAt
- changeAt
- amountMinor
- currency
- tiers
- rounding
properties:
startAt:
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
changeAt:
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: The moment of cancellation/change; never read from the clock.
amountMinor:
type: integer
minimum: 0
maximum: 1000000000000
currency:
type: string
pattern: ^[A-Z]{3}$
maxLength: 3
timeZone:
type: string
pattern: ^[A-Za-z][A-Za-z0-9_+-]*(/[A-Za-z0-9_+-]+){0,2}$
maxLength: 64
description: Needed for daysBefore tiers.
tiers:
type: array
minItems: 1
maxItems: 12
items:
type: object
required:
- name
properties:
name:
type: string
maxLength: 64
hoursBefore:
type: integer
minimum: 0
maximum: 87600
description: This tier applies when the change is later than start minus this many hours. Exactly one of hoursBefore or daysBefore.
daysBefore:
type: integer
minimum: 0
maximum: 3650
description: '...later than the local date of start minus this many days at atLocalTime.'
atLocalTime:
type: string
pattern: ^([01]\d|2[0-3]):[0-5]\d$
maxLength: 5
description: With daysBefore.
penaltyBps:
type: integer
minimum: 0
maximum: 10000
description: Percent of the amount in basis points. Exactly one of penaltyBps or penaltyMinor.
penaltyMinor:
type: integer
minimum: 0
maximum: 1000000000000
rounding:
type: string
enum:
- half-up
- floor
- ceil
description: Applied to percentage penalties.
noShowTier:
type: string
maxLength: 64
description: Tier name charged when changeAt is after startAt; default the most severe tier.
claimedPenaltyMinor:
type: integer
minimum: 0
maximum: 1000000000000
example:
startAt: '2026-12-10T19:00:00Z'
changeAt: '2026-12-08T18:30:00Z'
amountMinor: 45000
currency: EUR
timeZone: Europe/Paris
rounding: half-up
tiers:
- name: 50% from 3 days before 18:00 local
daysBefore: 3
atLocalTime: '18:00'
penaltyBps: 5000
- name: 100% within 24h
hoursBefore: 24
penaltyBps: 10000
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.'
tier:
type: string
free:
type: boolean
penaltyMinor:
type: integer
cappedAtAmount:
type: boolean
currency:
type: string
deadlines:
type: array
items:
type: object
properties:
tier:
type: string
deadlineUtc:
type: string
deadlineLocal:
type: string
nextTierAtUtc:
type: string
afterStart:
type: boolean
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:
- Booking Change Penalty
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