WritersLogic Verifiable AI Agent Hub Minor Units API
The Minor Units API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for minor units.
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OpenAPI Specification
openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Minor Units 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: Minor Units
paths:
/api/v1/minor-units:
post:
operationId: minor_units
summary: 'ISO 4217 minor units: decimal amount to integer minor units and back'
description: 'Converts up to 200 money amounts between decimal strings and integer minor units (cents, yen, fils) using the ISO 4217 exponent from the SIX Group list, for an agent about to send an amount to a payment API. Returns the exponent, the integer minor amount and the canonical decimal string; JPY is 0, KWD and BHD are 3, CLF is 4. An amount with more fraction digits than the currency allows fails with the excess digits unless a rounding mode is given. Codes with no minor unit (XAU, XXX) are unsupported and codes not on the list are unknown; an exponent is never guessed. Does not convert between currencies and does not apply cash rounding (see cash-rounding).
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/minor-units
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- items
properties:
items:
type: array
minItems: 1
maxItems: 200
items:
type: object
required:
- currency
properties:
currency:
type: string
pattern: ^[A-Z]{3}$
description: ISO 4217 alphabetic code, upper case.
amount:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: Decimal amount to convert to minor units. Give amount or minor, or neither to look up the exponent.
minor:
type: integer
minimum: -999999999999999
maximum: 999999999999999
description: Integer minor units to convert to a decimal string.
exponent:
type: integer
minimum: 0
maximum: 8
description: Override for currencies absent from ISO 4217 list one or without a minor unit. Wins over the list.
rounding:
type: string
enum:
- half-up
- half-down
- half-even
- up
- down
- ceiling
- floor
description: 'Only used when amount has more fraction digits than the exponent. half-up: ties away from zero. half-down: ties toward zero. half-even: ties to the even neighbour. up: away from zero. down: toward zero. ceiling: toward +infinity. floor: toward -infinity.'
additionalProperties: false
example:
items:
- currency: JPY
amount: '1500'
- currency: KWD
minor: 12345
- currency: USD
amount: '19.999'
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
status:
type: string
enum:
- pass
- fail
- unknown
- unsupported
currency:
type: string
exponent:
type: integer
description: Absent when unknown or unsupported.
minor:
type: integer
amount:
type: string
description: Canonical decimal with exactly `exponent` fraction digits.
roundedFrom:
type: string
description: The input amount, when a rounding mode changed it.
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:
- Minor Units
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