WritersLogic Verifiable AI Agent Hub Syndication Hint API
The Syndication Hint API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for syndication hint.
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curl "https://apis.io/api/v1/apis/writerslogic-com:writerslogic-com-syndication-hint-api"
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OpenAPI Specification
openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Syndication Hint 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: Syndication Hint
paths:
/api/v1/syndication-hint:
post:
operationId: syndication_hint
summary: Detect near-duplicate passages (syndicated or copied text) so repeated sources…
description: 'Compares up to 30 passages an agent collected and reports which pairs share word-shingle content (Jaccard and containment), grouping them into clusters of probable copies so the number of independent sources can be stated honestly. Does not establish who copied whom, does not detect paraphrase or translation, and does not fetch anything; a high similarity is a hint that sources are not independent.
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: agent-infra
x-sample-url: https://agents.writerslogic.com/api/v1/samples/syndication-hint
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- passages
properties:
passages:
type: array
items:
type: object
additionalProperties: false
properties:
id:
type: string
maxLength: 100
minLength: 1
description: Unique id.
text:
type: string
maxLength: 50000
minLength: 1
description: Passage text.
url:
type: string
maxLength: 2000
required:
- id
- text
maxItems: 30
minItems: 2
description: Up to 30; 300000 characters in total.
shingleWords:
type: integer
minimum: 2
maximum: 12
description: Words per shingle. Default 5.
jaccardThreshold:
type: number
minimum: 0.05
maximum: 1
description: Pairs at or above this Jaccard similarity are flagged. Default 0.5.
containmentThreshold:
type: number
minimum: 0.05
maximum: 1
description: Pairs where this share of the smaller passage's shingles appear in the other are flagged (catches an excerpt of a longer copy). Default 0.8.
example:
passages:
- id: wire
text: The central bank raised interest rates by a quarter point on Wednesday, citing persistent inflation in services and a tight labor market.
- id: reprint
text: 'Reuters: The central bank raised interest rates by a quarter point on Wednesday, citing persistent inflation in services and a tight labor market. Shares fell.'
- id: other
text: Economists at three universities published a study of regional housing prices and commuting patterns over the last decade.
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.'
pairs:
type: array
items:
type: object
additionalProperties: false
properties:
a:
type: string
b:
type: string
jaccard:
type: number
containment:
type: number
sharedShingles:
type: integer
maxItems: 435
description: Flagged pairs only, most similar first.
clusters:
type: array
items:
type: object
additionalProperties: false
properties:
ids:
type: array
items:
type: string
maxLength: 100
maxItems: 30
maxItems: 30
description: Groups of passages linked by flagged pairs; singletons included.
independentGroups:
type: integer
description: 'Number of clusters: the independent-source count after collapsing copies.'
tooShort:
type: array
items:
type: string
maxLength: 100
maxItems: 30
description: Passages with fewer words than one shingle; they cannot be compared.
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:
- Syndication Hint
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