The Quota Reservation Check API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for quota reservation check.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Quota Reservation…
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: Quota Reservation Check
paths:
/api/v1/quota-reservation-check:
post:
operationId: quota_reservation_check
summary: Would this request fit in the remaining quota, given a snapshot and pending…
description: 'Computes available quota from a caller-supplied snapshot (limit, used, reserved) minus the unexpired pending reservations and says whether a requested amount fits. This is a read of the numbers you supply as of snapshotAt: it reserves nothing, so concurrent consumers can still use the quota before you do, and every response says so. A stale snapshot gives unknown, not pass; a window that ended at or before asOf gives unknown even when the request does not fit, because the numbers belong to the previous window. Does not query any provider and is not a rate limiter (use the coordination token-bucket for reservations).
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/quota-reservation-check
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- quota
- request
- snapshotAt
- asOf
properties:
quota:
type: object
additionalProperties: false
required:
- limit
- used
properties:
limit:
type: integer
minimum: 0
maximum: 9007199254740991
used:
type: integer
minimum: 0
maximum: 9007199254740991
reserved:
type: integer
minimum: 0
maximum: 9007199254740991
description: Amount already reserved and counted outside `pending`.
windowEndsAt:
type: string
maxLength: 40
description: RFC 3339 end of the quota window the snapshot belongs to.
pending:
type: array
maxItems: 200
items:
type: object
additionalProperties: false
required:
- id
- amount
properties:
id:
type: string
minLength: 1
maxLength: 200
amount:
type: integer
minimum: 0
maximum: 9007199254740991
expiresAt:
type: string
maxLength: 40
description: RFC 3339; a reservation expiring at or before asOf no longer holds quota. Omit for a hold that does not expire.
request:
type: object
additionalProperties: false
required:
- amount
properties:
amount:
type: integer
minimum: 0
maximum: 9007199254740991
snapshotAt:
type: string
maxLength: 40
description: RFC 3339 instant the quota numbers were read.
asOf:
type: string
maxLength: 40
description: RFC 3339 instant of the decision (no clock is read).
maxSnapshotAgeSeconds:
type: integer
minimum: 0
maximum: 31536000
example:
quota:
limit: 1000
used: 700
reserved: 50
pending:
- id: job-1
amount: 100
request:
amount: 120
snapshotAt: '2026-11-04T12:00:00Z'
asOf: '2026-11-04T12:00:20Z'
maxSnapshotAgeSeconds: 60
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.'
available:
type: integer
description: limit - used - reserved - held pending; may be negative if oversubscribed.
held:
type: integer
description: Sum of unexpired pending reservations.
shortfall:
type: integer
description: How much the request exceeds available; 0 when it fits.
snapshotBound:
type: boolean
description: 'Always true: nothing is reserved.'
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:
- Quota Reservation 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