WritersLogic Verifiable AI Agent Hub Optimize Tariff API
The Optimize Tariff API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for optimize tariff.
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OpenAPI Specification
openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Optimize Tariff 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: Optimize Tariff
paths:
/api/v1/optimize-tariff:
post:
operationId: tariff_engineer
summary: Global Customs & Tariff Engineering Optimizer
description: 'Classifies a product under the HTS with GRI reasoning and verifies the code and general (MFN) rate against the live USITC schedule, flags when a specific sibling subheading may outrank the chosen residual one, separates lower-duty options from reclassification risk with dollar exposure, lists lawful physical tariff-engineering changes, and drafts an accurate commercial invoice description. Leads with a decision, the dollars at stake and the next step. Section 301/232/IEEPA add-ons are model estimates and marked unverified. Not legal advice or a binding ruling.
Price: 1.50 USDC on Base (x402).'
x-x402-price-usdc: '1.50'
x-x402-amount: '1500000'
x-payment-info:
protocols:
- x402
price:
mode: fixed
currency: USD
amount: '1.50'
x-audience: business
x-sample-url: https://agents.writerslogic.com/api/v1/samples/tariff-engineer
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- productName
- materialsBreakdown
- intendedUse
- originCountry
- destinationCountry
properties:
productName:
type: string
minLength: 2
maxLength: 300
materialsBreakdown:
type: array
minItems: 1
maxItems: 30
items:
type: object
additionalProperties: false
required:
- material
- percentByWeight
properties:
material:
type: string
minLength: 1
maxLength: 200
percentByWeight:
type: number
minimum: 0
maximum: 100
percentByValue:
type: number
minimum: 0
maximum: 100
intendedUse:
type: string
minLength: 2
maxLength: 2000
originCountry:
type: string
minLength: 2
maxLength: 60
destinationCountry:
type: string
minLength: 2
maxLength: 60
productDescription:
type: string
maxLength: 5000
description: Construction, dimensions, how it works, packaging.
customsValueUsd:
type: number
minimum: 0
maximum: 10000000000
description: Entered value, used to estimate duty and savings.
currentHtsCode:
type: string
pattern: ^\d{4}(\.?\d{2}){1,3}$
importStateOfAssembly:
type: string
enum:
- fully_assembled
- unassembled_kit
- components
- bulk
productUrl:
type: string
maxLength: 2048
description: Public product or spec-sheet page. Its text is read to supplement productDescription; if it cannot be read the request still succeeds and says so in warnings.
example:
productName: Women's waterproof ankle boot
materialsBreakdown:
- material: Rubber/plastics outer sole
percentByWeight: 45
- material: Polyurethane-coated textile upper
percentByWeight: 40
- material: Textile lining
percentByWeight: 15
intendedUse: Everyday wet-weather footwear
originCountry: Vietnam
destinationCountry: United States
customsValueUsd: 85000
importStateOfAssembly: fully_assembled
responses:
'200':
description: Paid result with provenance
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
primaryClassification:
type: object
additionalProperties: false
required:
- htsCode
- description
- adValoremPct
- rateText
- reasoning
properties:
htsCode:
type: string
description: Destination tariff code, 6-10 digits (e.g. 6404.11.90).
description:
type: string
description: Heading/subheading text.
adValoremPct:
type: number
description: General ad valorem duty rate in percent; -1 if specific or compound.
rateText:
type: string
description: Rate as written, including specific components.
reasoning:
type: string
description: GRI analysis, section/chapter notes, and any relevant rulings.
rate_source:
type: string
enum:
- usitc_hts
- model
description: 'usitc_hts: description and rate come from the official HTS line; model: the model''s recollection.'
hts_status:
type: string
enum:
- found
- not_final
- not_found
- lookup_failed
- invalid_format
- not_checked
hts_note:
type: string
rate_kind:
type: string
enum:
- free
- ad_valorem
- specific
- compound
- other
units:
type: array
items:
type: string
origin_preference:
type: object
description: Special-column rate listing the origin country; informational, not applied to the estimate.
nearest_codes:
type: array
items:
type: object
description: Real HTS lines sharing the longest prefix with a code that does not exist.
candidates:
type: array
items:
type: object
description: Final 8-digit lines under a heading or subheading code.
additionalDuties:
type: array
items:
type: object
additionalProperties: false
required:
- program
- adValoremPct
- applies_because
- verify_at
properties:
program:
type: string
description: e.g. Section 301, Section 232, IEEPA, AD/CVD, or an FTA preference.
adValoremPct:
type: number
description: Additional percent; negative for a preference reduction.
applies_because:
type: string
verify_at:
type: string
description: Where to confirm the current rate.
verified:
type: boolean
description: 'Always false: add-on programs are model-recalled and not checked against Chapter 99, CSMS or AD/CVD orders.'
verification:
type: string
alternatives:
type: array
items:
type: object
properties:
classification:
type: object
additionalProperties: false
required:
- htsCode
- description
- adValoremPct
- rateText
- reasoning
properties:
htsCode:
type: string
description: Destination tariff code, 6-10 digits (e.g. 6404.11.90).
description:
type: string
description: Heading/subheading text.
adValoremPct:
type: number
description: General ad valorem duty rate in percent; -1 if specific or compound.
rateText:
type: string
description: Rate as written, including specific components.
reasoning:
type: string
description: GRI analysis, section/chapter notes, and any relevant rulings.
rate_source:
type: string
enum:
- usitc_hts
- model
description: 'usitc_hts: description and rate come from the official HTS line; model: the model''s recollection.'
hts_status:
type: string
enum:
- found
- not_final
- not_found
- lookup_failed
- invalid_format
- not_checked
hts_note:
type: string
rate_kind:
type: string
enum:
- free
- ad_valorem
- specific
- compound
- other
units:
type: array
items:
type: string
origin_preference:
type: object
description: Special-column rate listing the origin country; informational, not applied to the estimate.
nearest_codes:
type: array
items:
type: object
description: Real HTS lines sharing the longest prefix with a code that does not exist.
candidates:
type: array
items:
type: object
description: Final 8-digit lines under a heading or subheading code.
direction:
type: string
enum:
- lower_duty
- higher_duty
- same
- unknown
description: 'lower_duty: the MFN rate is below the primary''s. higher_duty: choosing it would cost more (rateDeltaPct and estimatedSavingsUsd are then negative).'
engineeringOptions:
type: array
items:
type: object
properties:
target:
type: object
additionalProperties: false
required:
- htsCode
- description
- adValoremPct
- rateText
- reasoning
properties:
htsCode:
type: string
description: Destination tariff code, 6-10 digits (e.g. 6404.11.90).
description:
type: string
description: Heading/subheading text.
adValoremPct:
type: number
description: General ad valorem duty rate in percent; -1 if specific or compound.
rateText:
type: string
description: Rate as written, including specific components.
reasoning:
type: string
description: GRI analysis, section/chapter notes, and any relevant rulings.
rate_source:
type: string
enum:
- usitc_hts
- model
description: 'usitc_hts: description and rate come from the official HTS line; model: the model''s recollection.'
hts_status:
type: string
enum:
- found
- not_final
- not_found
- lookup_failed
- invalid_format
- not_checked
hts_note:
type: string
rate_kind:
type: string
enum:
- free
- ad_valorem
- specific
- compound
- other
units:
type: array
items:
type: string
origin_preference:
type: object
description: Special-column rate listing the origin country; informational, not applied to the estimate.
nearest_codes:
type: array
items:
type: object
description: Real HTS lines sharing the longest prefix with a code that does not exist.
candidates:
type: array
items:
type: object
description: Final 8-digit lines under a heading or subheading code.
direction:
type: string
enum:
- lower_duty
- higher_duty
- same
- unknown
recommended:
type: boolean
description: False when the change would not lower the MFN duty.
commercialInvoiceDescription:
type: string
description: Accurate description of the goods as actually imported.
documentation:
type: array
items:
type: string
complianceWarnings:
type: array
items:
type: string
bindingRulingAdvice:
type: string
headline:
type: object
description: 'Decision first: the verdict, the dollars at stake, confidence and the exact next step.'
properties:
decision:
type: string
enum:
- KEEP_CURRENT_CODE
- LOWER_DUTY_OPTION_FOUND
- RECLASSIFICATION_RISK
- NEEDS_REVIEW
summary:
type: string
amountAtStakeUsd:
anyOf:
- type: number
- type: 'null'
description: Dollars saved or recoverable if the recommended action succeeds; null when it cannot be computed from the input.
amountBasis:
type: string
confidence:
type: string
enum:
- high
- medium
- low
nextStep:
type: string
lowerDutyOptions:
type: array
description: Alternatives and engineering options whose MFN rate is lower than the primary, best saving first.
items:
type: object
reclassificationRisk:
type: object
description: present is true when a strong or moderate alternative carries a higher MFN rate than the primary; exposureUsd is the extra duty on customsValueUsd.
classificationChecks:
type: array
description: Code-level checks against the official schedule, e.g. a specific sibling subheading matching your description of the goods.
items:
type: object
fees:
type: array
description: Merchandise processing and harbor maintenance fees, computed in code and kept out of the duty rate.
items:
type: object
warnings:
type: array
items:
type: string
disclaimer:
type: string
currentHtsCodeCheck:
type: object
additionalProperties: false
required:
- htsCode
- description
- adValoremPct
- rateText
- reasoning
properties:
htsCode:
type: string
description: Destination tariff code, 6-10 digits (e.g. 6404.11.90).
description:
type: string
description: Heading/subheading text.
adValoremPct:
type: number
description: General ad valorem duty rate in percent; -1 if specific or compound.
rateText:
type: string
description: Rate as written, including specific components.
reasoning:
type: string
description: GRI analysis, section/chapter notes, and any relevant rulings.
rate_source:
type: string
enum:
- usitc_hts
- model
description: 'usitc_hts: description and rate come from the official HTS line; model: the model''s recollection.'
hts_status:
type: string
enum:
- found
- not_final
- not_found
- lookup_failed
- invalid_format
- not_checked
hts_note:
type: string
rate_kind:
type: string
enum:
- free
- ad_valorem
- specific
- compound
- other
units:
type: array
items:
type: string
origin_preference:
type: object
description: Special-column rate listing the origin country; informational, not applied to the estimate.
nearest_codes:
type: array
items:
type: object
description: Real HTS lines sharing the longest prefix with a code that does not exist.
candidates:
type: array
items:
type: object
description: Final 8-digit lines under a heading or subheading code.
estimate:
type: object
_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:
- Optimize Tariff
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