The Storage Charge Clock API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for storage charge clock.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Storage Charge Clock…
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: Storage Charge Clock
paths:
/api/v1/storage-charge-clock:
post:
operationId: storage_charge_clock
summary: 'Storage, demurrage or detention charge: free-time end date, chargeable days and…'
description: 'Counts days between a received date and a released date for storage, demurrage, detention or parking charges: you state whether the receipt day and the release day count, how free days are counted (calendar or business days on a named or caller calendar), and a tiered per-day rate schedule by chargeable day number; returns the last free day, chargeable days, a per-tier breakdown and the total in minor units, and checks an asserted total. It applies exactly the counting you declare and does not know any carrier''s or warehouse''s tariff, grace periods or caps; amounts are integer minor units with 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/storage-charge-clock
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- receivedOn
- releasedOn
- receiptDayCounts
- releaseDayCounts
- freeDays
- freeCounting
- chargeCounting
- tiers
- currency
properties:
receivedOn:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
maxLength: 10
releasedOn:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
maxLength: 10
receiptDayCounts:
type: boolean
description: Whether the day of receipt is day 1.
releaseDayCounts:
type: boolean
description: Whether the release day is counted.
freeDays:
type: integer
minimum: 0
maximum: 3650
freeCounting:
type: string
enum:
- calendar
- business
chargeCounting:
type: string
enum:
- calendar
- business
description: Whether chargeable days skip weekends/holidays.
tiers:
type: array
minItems: 1
maxItems: 20
items:
type: object
required:
- fromDay
- rateMinor
properties:
fromDay:
type: integer
minimum: 1
maximum: 3650
description: Chargeable day number (1 = first day after free time) at which this rate starts; the first tier must start at 1.
rateMinor:
type: integer
minimum: 0
maximum: 1000000000
description: Charge per day in minor units (cents).
currency:
type: string
pattern: ^[A-Z]{3}$
maxLength: 3
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: Named holiday calendar with a source and supported date range (outside it the answer is unsupported), weekends-only (Saturday/Sunday only), or caller (only the holidays you list).
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: Non-business weekdays, 0=Sunday..6=Saturday. Default [0, 6]; use [5, 6] for a Friday/Saturday weekend.
claimedChargeMinor:
type: integer
minimum: 0
maximum: 9007199254740991
example:
receivedOn: '2026-11-02'
releasedOn: '2026-11-20'
receiptDayCounts: false
releaseDayCounts: true
freeDays: 5
freeCounting: business
chargeCounting: calendar
tiers:
- fromDay: 1
rateMinor: 7500
- fromDay: 6
rateMinor: 15000
currency: USD
calendar: us-federal
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.'
lastFreeDay:
type: string
countedDays:
type: integer
chargeableDays:
type: integer
breakdown:
type: array
items:
type: object
properties:
fromDay:
type: integer
toDay:
type: integer
days:
type: integer
rateMinor:
type: integer
amountMinor:
type: integer
totalMinor:
type: integer
currency:
type: string
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:
- Storage Charge Clock
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