The Pack Size API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for pack size.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Pack Size 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: Pack Size
paths:
/api/v1/pack-size:
post:
operationId: pack_size
summary: 'Pack sizes, MOQ, order increments, overbuy cap and price breakpoints: what to…'
description: 'Finds the cheapest valid order quantity for a requested number of units across up to 50 supplier options, for an agent buying parts or consumables sold in packs. Each option has a pack size (units per pack or notation such as "6x100", "case of 12", "12/case", "case of 6 inners"), an optional minimum order quantity, an order increment and price breakpoints; the order is rounded up to a multiple of both the pack and the increment and at least the MOQ, and a higher breakpoint is considered when raising the quantity to it costs no more. A notation that does not fix the count ("6x100g": 6 pieces or 600 g; "case of 6 inners" with no units per inner) returns unknown with every reading. An overbuy cap in percent rejects options that exceed it. Prices are in whatever currency the caller uses. Not a stock or lead-time check.
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/pack-size
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- requested
- options
properties:
requested:
type: integer
minimum: 1
maximum: 1000000000
description: Units needed.
options:
type: array
minItems: 1
maxItems: 50
items:
type: object
required:
- id
properties:
id:
type: string
minLength: 1
maxLength: 80
packNotation:
type: string
minLength: 1
maxLength: 40
description: e.g. "6x100", "case of 12", "12/case", "case of 6 inners".
unitsPerPack:
type: integer
minimum: 1
maximum: 1000000000
description: Settles an ambiguous packNotation; a value that matches no reading of the notation fails.
innerUnits:
type: integer
minimum: 1
maximum: 1000000
description: Units per inner pack, for notations that count inner packs.
moq:
type: integer
minimum: 1
maximum: 1000000000
description: Minimum order quantity in units.
increment:
type: integer
minimum: 1
maximum: 1000000000
description: 'Orders must be a multiple of this many units (default: the pack size).'
unitPrice:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: Base price per unit.
breakpoints:
type: array
maxItems: 20
items:
type: object
required:
- minQty
- unitPrice
properties:
minQty:
type: integer
minimum: 1
maximum: 1000000000
unitPrice:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
additionalProperties: false
description: Price per unit from minQty units upward (the highest breakpoint reached applies).
additionalProperties: false
overbuyCapPercent:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: Reject orders exceeding the request by more than this percent.
example:
requested: 250
overbuyCapPercent: '25'
options:
- id: A
packNotation: case of 12
unitPrice: '1.50'
breakpoints:
- minQty: 300
unitPrice: '1.20'
- id: B
packNotation: 6x100
moq: 600
unitPrice: '1.00'
- id: C
packNotation: case of 6 inners
unitPrice: '1.10'
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.'
options:
type: array
items:
type: object
properties:
id:
type: string
status:
type: string
enum:
- pass
- fail
- unknown
- unsupported
unitsPerPack:
type: integer
readings:
type: array
items:
type: object
properties:
unitsPerPack:
type: integer
structure:
type: string
orderQty:
type: integer
packs:
type: integer
overbuyUnits:
type: integer
overbuyPercent:
type: string
unitPrice:
type: string
total:
type: string
description: Exact orderQty x unit price.
note:
type: string
best:
type: string
description: Id of the cheapest valid option by total (lowest overbuy, then first, on ties).
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:
- Pack Size
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