The Clause Tag API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for clause tag.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Clause Tag 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: Clause Tag
paths:
/api/v1/clause-tag:
post:
operationId: clause_tag
summary: Rule-based clause tagging (obligation, prohibition, permission, condition…
description: 'Tags each contract-style clause you supply with the modal force it expresses (obligation, prohibition, permission, recommendation) and topic cues (definition, condition, termination, payment, confidentiality, liability, governing law, notice, assignment), with the matched cue and its offset. For an agent that must triage many clauses before a human or model reads them. Fixed cue phrases only (plus cues you add): a clause no rule decides is reported as undecided and the status is unknown. Not legal analysis, no model, and ''will'' or a bare cue-less sentence is never forced into a tag.
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/clause-tag
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- clauses
properties:
clauses:
type: array
items:
type: string
maxLength: 3000
description: One clause.
maxItems: 100
minItems: 1
description: Up to 100000 characters in total.
extraCues:
type: array
items:
type: object
additionalProperties: false
required:
- tag
- phrase
properties:
tag:
type: string
maxLength: 40
description: Tag to assign.
phrase:
type: string
maxLength: 80
description: Literal word phrase (case-insensitive, up to 8 words).
maxItems: 100
description: Your own cue phrases, matched as literal word sequences.
expect:
type: array
items:
type: object
additionalProperties: false
required:
- clause
- tags
properties:
clause:
type: integer
description: Clause index.
minimum: 0
maximum: 99
tags:
type: array
items:
type: string
maxLength: 40
description: Expected tag.
maxItems: 20
maxItems: 100
description: Tags a clause must carry; a missing one fails.
example:
clauses:
- The Supplier shall deliver the Goods within 30 days of the Order.
- Customer may not assign this Agreement without prior written consent.
- This Agreement is governed by the laws of Ireland.
- Thank you for your business.
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.'
clauses:
type: array
items:
type: object
properties:
index:
type: integer
tags:
type: array
items:
type: string
modality:
anyOf:
- type: string
enum:
- obligation
- prohibition
- permission
- recommendation
- type: 'null'
decided:
type: boolean
reason:
type: string
enum:
- cue-matched
- only-ambiguous-cue
- no-rule-matched
hits:
type: array
items:
type: object
properties:
tag:
type: string
cue:
type: string
offset:
type: integer
description: UTF-16 offset in the clause.
weak:
type: boolean
undecided:
type: array
items:
type: integer
maxItems: 100
description: Indexes of clauses no rule decided.
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:
- Clause Tag
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