The Pagination Loop API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for pagination loop.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Pagination Loop 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: Pagination Loop
paths:
/api/v1/pagination-loop:
post:
operationId: pagination_loop
summary: Detect repeated cursors, duplicate-only pages and no progress in a pagination…
description: 'Takes the pages an agent has fetched so far (cursor used, next cursor returned, item ids) and finds the failures that make a scan loop or lie: a next cursor already used, a page whose items were all seen before, a page that returned nothing new yet offers another cursor, a scan that has not ended. Optionally takes declared ordering and cursor assumptions and lists the omission risks they imply (offset cursors under mutation, non-unique sort keys, unstable order). Each page''s cursor must be the previous page''s next cursor, otherwise pages are missing and the result is unknown. pass only when the scan ended (no next cursor), nothing repeated and no declared risk applies. Does not call the API and cannot prove completeness; unknown means that.
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/pagination-loop
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- pages
properties:
pages:
type: array
minItems: 1
maxItems: 500
items:
type: object
additionalProperties: false
required:
- items
properties:
cursor:
type: string
maxLength: 500
description: Cursor used to request this page; omit for the first page.
nextCursor:
type: string
maxLength: 500
description: Cursor returned for the next page; omit or empty when the API reports no more.
items:
type: array
maxItems: 2000
items:
type: string
maxLength: 200
description: Stable item ids on this page, in returned order.
declared:
type: object
additionalProperties: false
properties:
ordering:
type: string
enum:
- stable-unique-key
- stable-nonunique-key
- unstable
- unknown
description: How the API orders results.
cursorKind:
type: string
enum:
- opaque
- offset
- keyset
mutatedDuringScan:
type: boolean
description: Whether items may have been inserted or deleted while paging.
example:
pages:
- items:
- a
- b
nextCursor: c1
- cursor: c1
items:
- c
- d
nextCursor: c2
- cursor: c2
items:
- e
declared:
ordering: stable-unique-key
cursorKind: opaque
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.'
pagesChecked:
type: integer
itemsSeen:
type: integer
uniqueItems:
type: integer
duplicateItems:
type: integer
ended:
type: boolean
description: The last page offered no next cursor.
loopAtPage:
type: integer
description: Index of the first page that repeats a cursor, when any.
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:
- Pagination Loop
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