The Cache Key Check API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for cache key 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-cache-key-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 Cache Key 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: Cache Key Check
paths:
/api/v1/cache-key-check:
post:
operationId: cache_key_check
summary: Check that a result-cache key contains every input that changes the result, and…
description: 'Given the inputs of a cached computation (each declared as influencing the output or not, optionally volatile) and the list of inputs the cache key is built from, finds influential inputs missing from the key (stale or wrong hits), volatile inputs inside it (the cache never hits), unknown-influence inputs left out, and, for private results, a missing tenant dimension (cross-tenant leak). When values are given it also returns a deterministic key digest (RFC 8785 JSON + SHA-256). Does not inspect code to find what influences the output: that is declared by the caller.
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/cache-key-check
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- inputs
- keyParts
properties:
inputs:
type: array
minItems: 1
maxItems: 100
items:
type: object
additionalProperties: false
required:
- name
- influencesOutput
properties:
name:
type: string
minLength: 1
maxLength: 200
influencesOutput:
type: string
enum:
- 'yes'
- 'no'
- unknown
volatile:
type: boolean
description: Changes on every call (timestamp, request id, nonce).
value:
description: Optional value, used only to compute the key digest.
keyParts:
type: array
maxItems: 100
items:
type: string
minLength: 1
maxLength: 200
description: Names of the inputs the key is built from.
scope:
type: string
maxLength: 200
description: Namespace mixed into the digest.
private:
type: boolean
description: The result is per-tenant or per-user.
tenantInput:
type: string
minLength: 1
maxLength: 200
description: Name of the input that identifies the tenant or user; required in the key when private.
example:
inputs:
- name: query
influencesOutput: 'yes'
value: shoes
- name: locale
influencesOutput: 'yes'
value: de-DE
- name: requestId
influencesOutput: 'no'
volatile: true
value: r-1
keyParts:
- query
scope: search:v3
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.'
missing:
type: array
items:
type: string
description: Influential inputs absent from the key.
unclassifiedMissing:
type: array
items:
type: string
description: Unknown-influence inputs absent from the key.
volatileInKey:
type: array
items:
type: string
unknownKeyParts:
type: array
items:
type: string
description: Key parts that are not declared inputs.
keyDigest:
type: string
description: Present when every key part has a value.
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:
- Cache Key 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