The Calibration Coverage API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for calibration coverage.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Calibration Coverage…
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: Calibration Coverage
paths:
/api/v1/calibration-coverage:
post:
operationId: calibration_coverage
summary: 'Calibration certificate vs intended use: range, uncertainty and validity'
description: 'Checks whether an instrument''s calibration certificate covers an intended measurement, for an agent about to rely on a reading or accept a calibrated device. Three checks: the intended range [min, max] lies inside the calibrated ranges (touching or overlapping ranges are joined); the stated expanded uncertainty of every calibrated range used is no larger than the required uncertainty; the calibration is current on the caller''s `asOf` date (due date = validUntil, or calibratedOn plus intervalMonths, clamped to month end) and on `usedOn` when given. Units must be identical (no conversion is attempted). A missing uncertainty when one is required, or no due date, returns unknown. The reference instant is always supplied by the caller. Does not assess traceability, the accreditation of the laboratory or drift between calibrations.
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: business
x-sample-url: https://agents.writerslogic.com/api/v1/samples/calibration-coverage
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- certificate
- use
- asOf
properties:
certificate:
type: object
required:
- unit
- ranges
- calibratedOn
properties:
unit:
type: string
minLength: 1
maxLength: 24
ranges:
type: array
minItems: 1
maxItems: 50
items:
type: object
required:
- min
- max
properties:
min:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
max:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
uncertainty:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: Expanded uncertainty over this range, absolute, in `unit`.
additionalProperties: false
calibratedOn:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
description: Calendar date YYYY-MM-DD.
validUntil:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
description: Due date on the certificate, inclusive.
intervalMonths:
type: integer
minimum: 1
maximum: 120
description: Calibration interval when no due date is printed.
additionalProperties: false
use:
type: object
required:
- min
- max
- unit
properties:
min:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
max:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
unit:
type: string
minLength: 1
maxLength: 24
requiredUncertainty:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: Largest acceptable expanded uncertainty, absolute, in `unit`.
usedOn:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
description: Date of the measurement, when different from asOf.
additionalProperties: false
asOf:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
description: The reference date for validity; required, never defaulted to today.
example:
certificate:
unit: bar
ranges:
- min: '0'
max: '100'
uncertainty: '0.05'
- min: '100'
max: '200'
uncertainty: '0.15'
calibratedOn: '2026-02-28'
intervalMonths: 12
use:
min: '20'
max: '150'
unit: bar
requiredUncertainty: '0.2'
usedOn: '2026-10-01'
asOf: '2026-11-04'
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.'
rangeCovered:
type: boolean
uncoveredSegments:
type: array
items:
type: object
properties:
min:
type: string
max:
type: string
worstUncertainty:
type: string
description: Largest uncertainty among the calibrated ranges that overlap the intended use.
dueDate:
type: string
description: Date the calibration lapses (inclusive).
validOnAsOf:
type: boolean
validOnUse:
type: boolean
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:
- Calibration Coverage
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