The Dst Check API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for dst check.
Every API here is available over the APIs.io API and to AI agents over MCP.
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
find_apisBrowse and filter every API in the catalog.get_api_artifactsOne API's artifacts, grouped by type.get_openapiThe primary OpenAPI for this API.find_similar_apisAPIs that look like this one.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.curl "https://apis.io/api/v1/apis/writerslogic-com:writerslogic-com-dst-check-api"curl "https://apis.io/api/v1/apis?limit=25"Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.
Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.
A second provider on the same verified email joins the account you already have.
openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Dst Check 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: Dst Check
paths:
/api/v1/dst-check:
post:
operationId: dst_check
summary: DST gap and overlap check for local times and stated offsets in an IANA zone
description: 'Checks up to 100 local date-times (YYYY-MM-DDTHH:MM) or offset timestamps against an IANA time zone and reports whether each wall time exists once, never (spring-forward gap) or twice (fall-back overlap), with every real instant and the offset in force; also lists a zone''s offset transitions in a year. Built for an agent scheduling a meeting, cron job or deadline in someone else''s zone. Uses the runtime''s ICU tzdata (version reported), not a table of ours; it does not choose a resolution for you unless you ask via business-deadline, and does not read the clock.
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/dst-check
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- items
properties:
items:
type: array
minItems: 1
maxItems: 100
items:
type: object
required:
- timeZone
properties:
timeZone:
type: string
pattern: ^[A-Za-z][A-Za-z0-9_+-]*(/[A-Za-z0-9_+-]+){0,2}$
maxLength: 64
local:
type: string
pattern: ^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}(:\d{2}(\.\d{1,9})?)?$
maxLength: 30
description: Wall time without offset. Exactly one of local or timestamp.
timestamp:
type: string
pattern: ^\d{4}-\d{2}-\d{2}[Tt ]\d{2}:\d{2}(:\d{2}(\.\d{1,9})?)?(Z|z|[+-]\d{2}:?\d{2})$
maxLength: 36
description: RFC 3339 timestamp with offset; checked for consistency with the zone's offset at that instant; Z names UTC and makes no local claim, so it is never a mismatch.
transitionsIn:
type: object
required:
- timeZone
- year
properties:
timeZone:
type: string
pattern: ^[A-Za-z][A-Za-z0-9_+-]*(/[A-Za-z0-9_+-]+){0,2}$
maxLength: 64
year:
type: integer
minimum: 1900
maximum: 2199
example:
items:
- timeZone: America/New_York
local: 2026-03-08T02:30
- timeZone: America/New_York
local: 2026-11-01T01:30
transitionsIn:
timeZone: America/New_York
year: 2026
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.'
items:
type: array
items:
type: object
properties:
index:
type: integer
timeZone:
type: string
kind:
type: string
enum:
- normal
- gap
- overlap
- offset-consistent
- offset-mismatch
instantsUtc:
type: array
items:
type: string
offsets:
type: array
items:
type: string
shiftedForwardUtc:
type: string
zoneOffset:
type: string
statedOffset:
type: string
transitions:
type: array
items:
type: object
properties:
atUtc:
type: string
offsetBefore:
type: string
offsetAfter:
type: string
kind:
type: string
enum:
- spring-forward
- fall-back
- offset-change
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:
- Dst 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