The Pacing Intensity Evaluator API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for pacing intensity evaluator.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Pacing Intensity…
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: Pacing Intensity Evaluator
paths:
/api/v1/pacing-intensity-evaluator:
post:
operationId: pacing_intensity_evaluator
summary: Plot a prose intensity curve per sentence and flag where a tense passage loses…
description: 'Scores each sentence of narrative prose for pace from sentence length, share of one-syllable words, exclamation and question marks and, if you supply a word list, action-word share; smooths the scores into an intensity curve; and reports stalls, the spans where intensity falls well below an earlier peak. For a writing tool or editor agent checking an action or tension scene. A fixed-weight heuristic, not a model of reader experience: the weights are authored and unvalidated against human ratings, English only, and action words match exactly (no stemming, no built-in verb list). It does not rewrite text or judge quality.
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/pacing-intensity-evaluator
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- text
properties:
text:
type: string
maxLength: 100000
minLength: 1
description: Prose to score.
actionWords:
type: array
items:
type: string
maxLength: 40
minLength: 1
description: Exact word, matched case-insensitively.
maxItems: 500
description: Your own action-word list. Without it the action component is left out and the other weights are renormalized.
expect:
type: string
enum:
- any
- tense
description: 'tense: fail if the curve never reaches peakThreshold. any (default): only stalls after a peak can fail.'
window:
type: integer
minimum: 1
maximum: 20
description: Sentences in the trailing moving average. Default 3.
stallDrop:
type: number
minimum: 0.05
maximum: 0.9
description: Fall below the running peak that counts as a stall. Default 0.25 on the 0-1 intensity scale.
peakThreshold:
type: number
minimum: 0.1
maximum: 0.95
description: Smoothed intensity a passage must reach before a later fall can be a stall. Default 0.55.
minSentences:
type: integer
minimum: 2
maximum: 100
description: Fewer scored sentences is unknown. Default 8.
example:
text: He ran. The door slammed behind him! Boots hit the stairs, two at a time. Who was following? Glass broke somewhere above. He did not look back. The corridor stretched on for what seemed like an eternity, lined with portraits of ancestors whose names he had never learned and whose faces told him nothing at all. Eventually the hallway opened onto a wide and quiet room full of old furniture covered in sheets, where dust hung in the afternoon light and nothing at all moved.
expect: tense
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.'
summary:
type: object
additionalProperties: false
properties:
sentences:
type: integer
mean:
type: number
peak:
type: number
peakSentence:
type: integer
description: Index of the sentence with the highest smoothed intensity, -1 if none.
reachedPeak:
type: boolean
syllableCoverage:
type: number
description: Share of words whose syllable count the rules could decide; the rest are left out of the one-syllable share.
curve:
type: array
items:
type: object
additionalProperties: false
properties:
index:
type: integer
start:
type: integer
description: UTF-16 offset.
end:
type: integer
words:
type: integer
intensity:
type: number
smoothed:
type: number
maxItems: 3000
stalls:
type: array
items:
type: object
additionalProperties: false
properties:
startSentence:
type: integer
endSentence:
type: integer
start:
type: integer
end:
type: integer
peak:
type: number
trough:
type: number
recovered:
type: boolean
maxItems: 200
truncated:
type: boolean
description: True when the curve was cut to its first 3000 sentences; stalls and summary cover the whole text.
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:
- Pacing Intensity Evaluator
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