The Transcript Validator API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for transcript validator.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Transcript Validator…
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: Transcript Validator
paths:
/api/v1/transcript-validator:
post:
operationId: transcript_validator
summary: Check tool-call / tool-result pairing and ordering in an LLM transcript…
description: 'Validates a message list before it is sent to Anthropic Messages, OpenAI Chat Completions or OpenAI Responses: every tool call paired with its result, results in the right place and role, ids present and unique. Built for an agent that edits, truncates or replays its own history and would otherwise get a 400. Only rules stated in the providers'' documentation fail the check; anything else suspicious (for example an unanswered Chat Completions tool call, whose requirement the docs do not state) returns unknown with the reason. Does not validate message content, tool schemas, role alternation or thinking/reasoning blocks, and does not call any provider.
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/transcript-validator
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- provider
- messages
properties:
provider:
type: string
enum:
- anthropic
- openai-chat
- openai-responses
messages:
type: array
minItems: 1
maxItems: 500
items:
description: A provider-shaped message (anthropic, openai-chat) or input item (openai-responses).
expectComplete:
type: boolean
description: 'Default true: a trailing tool call without a result is a defect. Set false when the transcript is mid-loop and results are still pending.'
example:
provider: anthropic
messages:
- role: user
content: Weather in Paris?
- role: assistant
content:
- type: tool_use
id: toolu_1
name: get_weather
input:
city: Paris
- role: user
content:
- type: tool_result
tool_use_id: toolu_1
content: 18C
- type: text
text: Thanks
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
properties:
id:
type: string
name:
type: string
callIndex:
type: integer
resultIndex:
type: integer
description: Absent when unanswered.
pendingIds:
type: array
items:
type: string
description: Tool call ids without a result.
ruleBasis:
type: string
description: Documentation the rules come from.
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:
- Transcript Validator
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