The Evidence Bundle Check API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for evidence bundle check.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Evidence Bundle Check…
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: Evidence Bundle Check
paths:
/api/v1/evidence-bundle-check:
post:
operationId: evidence_bundle_check
summary: Check that every claim in an evidence bundle has enough independent, fresh…
description: 'Checks a bundle an agent assembled before answering: each claim must be backed by at least N evidence items from distinct source groups, each item''s quote must actually appear in the supplied text (with offsets), publication dates must be within the caller''s maximum age relative to a caller-supplied asOf, and duplicates are collapsed. Does not fetch URLs or judge whether a source is reliable or whether the quote supports the claim; source groups come from the caller or an approximate host reduction.
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/evidence-bundle-check
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- claims
- evidence
properties:
claims:
type: array
items:
type: object
additionalProperties: false
properties:
id:
type: string
maxLength: 100
minLength: 1
description: Unique id.
text:
type: string
maxLength: 2000
minEvidence:
type: integer
minimum: 1
maximum: 20
description: Distinct source groups needed. Default 1.
required:
- id
maxItems: 100
minItems: 1
description: Claims to support.
evidence:
type: array
items:
type: object
additionalProperties: false
properties:
id:
type: string
maxLength: 100
minLength: 1
description: Unique id.
claimIds:
type: array
items:
type: string
maxLength: 100
maxItems: 50
description: Claims this item is offered for.
url:
type: string
maxLength: 2000
sourceGroup:
type: string
maxLength: 200
description: Independent-source key (publisher/owner). Overrides the host reduction.
publishedAt:
type: string
maxLength: 40
description: ISO 8601 date or date-time.
text:
type: string
maxLength: 50000
description: Source text the quote should appear in.
quote:
type: string
maxLength: 2000
description: Verbatim excerpt claimed from text.
required:
- id
- claimIds
maxItems: 300
description: Up to 300 items; 300000 characters of text in total.
asOf:
type: string
maxLength: 40
description: Reference instant (ISO 8601) for age checks; required with maxAgeDays. The check never reads the clock.
maxAgeDays:
type: integer
minimum: 0
maximum: 36500
description: Evidence published longer ago than this (relative to asOf) is stale.
requireQuotes:
type: boolean
description: Evidence without a verifiable quote does not count as support. Default true.
example:
claims:
- id: c1
text: Revenue grew 12%.
minEvidence: 2
evidence:
- id: e1
claimIds:
- c1
url: https://www.example.com/q3
publishedAt: '2026-10-01'
text: Q3 revenue grew 12% year over year.
quote: revenue grew 12%
- id: e2
claimIds:
- c1
url: https://news.example.org/a
publishedAt: '2026-10-02'
text: Analysts noted that revenue grew 12% in the quarter.
quote: revenue grew 12%
asOf: '2026-11-04'
maxAgeDays: 90
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.'
claims:
type: array
items:
type: object
additionalProperties: false
properties:
id:
type: string
verdict:
type: string
enum:
- supported
- unsupported
- unverified
independentSources:
type: integer
needed:
type: integer
evidenceIds:
type: array
items:
type: string
maxLength: 100
maxItems: 300
maxItems: 100
evidence:
type: array
items:
type: object
additionalProperties: false
properties:
id:
type: string
state:
type: string
enum:
- verified
- unverifiable
- quote-not-found
- stale
- undated
- duplicate
group:
type: string
quoteSpan:
type: object
description: 'Half-open [start,end) range in four coordinate systems: UTF-16 code units, code points, UTF-8 bytes, extended grapheme clusters (Intl.Segmenter).'
properties:
utf16:
type: object
properties:
start:
type: integer
end:
type: integer
codePoint:
type: object
properties:
start:
type: integer
end:
type: integer
utf8:
type: object
properties:
start:
type: integer
end:
type: integer
grapheme:
type: object
properties:
start:
type: integer
end:
type: integer
graphemeAligned:
type: boolean
maxItems: 300
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:
- Evidence Bundle Check
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