WritersLogic Verifiable AI Agent Hub API Billing API
Verification credits and optional automatic purchases (JWT auth only)
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OpenAPI Specification
openapi: 3.2.0
info:
title: WritersProof API Billing API
version: 1.0.0
description: Certificate Authority and verification API for the Proof-of-Effort protocol. Certify, verify, and prove human authorship.
contact:
name: WritersLogic LLC
url: https://writersproof.com
license:
name: SSPL-1.0
url: https://www.mongodb.com/licensing/server-side-public-license
servers:
- url: https://api.writersproof.com
description: Production
- url: https://api.writerslogic.com
description: Legacy
tags:
- name: API Billing
description: Verification credits and optional automatic purchases (JWT auth only)
paths:
/v1/api-billing:
get:
tags:
- API Billing
security:
- bearerAuth: []
operationId: getApiCreditBalance
summary: Read credit balance and recent purchases
description: Account-wide transactional ledger. 100 free lookups per UTC month, then $10 USD per 1,000 prepaid credits. Purchased credits carry forward. Requires a signed-in bearer token; verification keys cannot manage purchases. 30 management requests per minute.
responses:
'200':
description: Current account ledger
content:
application/json:
schema:
type: object
required:
- freeAllowance
- freeUsed
- freeRemaining
- paidCredits
- creditDebt
- period
- completedLookups
- resetsAt
- transitionUntil
- pack
- autoReload
- orders
properties:
freeAllowance:
type: integer
minimum: 0
const: 100
freeUsed:
type: integer
minimum: 0
freeRemaining:
type: integer
minimum: 0
paidCredits:
type: integer
minimum: 0
creditDebt:
type: integer
minimum: 0
completedLookups:
type: integer
minimum: 0
period:
type: string
pattern: ^\d{4}-\d{2}$
resetsAt:
type: string
format: date-time
transitionUntil:
type:
- string
- 'null'
format: date-time
pack:
type: object
properties:
credits:
const: 1000
amount:
const: 1000
description: USD cents
currency:
const: usd
priceId:
type: string
autoReload:
type: object
properties:
enabled:
type: boolean
threshold:
type: integer
minimum: 0
packs:
type: integer
minimum: 0
monthlyCapCents:
type: integer
minimum: 0
committedThisMonthCents:
type: integer
minimum: 0
hasPaymentMethod:
type: boolean
lastError:
type:
- string
- 'null'
orders:
type: array
maxItems: 20
items:
type: object
properties:
id:
type: string
kind:
type: string
enum:
- manual
- auto
packs:
type: integer
minimum: 0
state:
type: string
enum:
- created
- pending
- paid
- failed
- review
created:
type: integer
minimum: 0
description: Unix milliseconds
reversed:
type: integer
minimum: 0
description: Credits reversed by refunds or disputes
'400':
description: Invalid input
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Signed-in bearer token required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'409':
description: Purchase conflict or saved payment method required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded; respect Retry-After
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Billing unavailable
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
/v1/api-billing/checkout:
post:
tags:
- API Billing
security:
- bearerAuth: []
operationId: createApiCreditCheckout
summary: Create a Stripe Checkout for verification credits
description: A one-time purchase, not a subscription. SaveCard optionally authorizes saving the card for later off-session use; it does not enable auto-reload. Redirect the signed-in user to the returned Stripe URL. Never fulfill from the redirect alone; credits are granted after server-side payment verification. Maximum five checkout requests per minute.
parameters:
- name: Idempotency-Key
in: header
required: true
schema:
type: string
format: uuid
description: Persist one UUID per purchase attempt; retries must use identical packs and saveCard. Start a new attempt after checkout expiration.
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- packs
properties:
packs:
type: integer
minimum: 1
maximum: 50
saveCard:
type: boolean
default: false
responses:
'200':
description: Hosted Checkout URL
content:
application/json:
schema:
type: object
required:
- url
properties:
url:
type: string
format: uri
'400':
description: Invalid input
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Signed-in bearer token required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'409':
description: Purchase conflict or saved payment method required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded; respect Retry-After
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Billing unavailable
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
/v1/api-billing/confirm:
post:
tags:
- API Billing
security:
- bearerAuth: []
operationId: confirmApiCreditCheckout
summary: Reconcile the returning customer’s Checkout
description: Idempotently retrieves current payment state from Stripe and verifies ownership. Pending is not a payment failure. Stripe webhooks also reconcile purchases, so closing the browser does not lose paid credits.
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- sessionId
properties:
sessionId:
type: string
maxLength: 256
pattern: ^cs_(test_|live_)?[A-Za-z0-9]+$
responses:
'200':
description: Payment reconciled or still processing
content:
application/json:
schema:
oneOf:
- type: object
required:
- ok
properties:
ok:
const: true
- type: object
required:
- pending
properties:
pending:
const: true
'400':
description: Invalid input
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Signed-in bearer token required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'409':
description: Purchase conflict or saved payment method required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded; respect Retry-After
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Billing unavailable
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
/v1/api-billing/auto-reload:
put:
tags:
- API Billing
security:
- bearerAuth: []
operationId: configureApiAutoReload
summary: Authorize or disable automatic credit purchases
description: Requires a saved payment method and explicit user consent to enable. Threshold considers free plus paid capacity. Monthly cap counts automatic orders initiated in the UTC month, including pending orders; manual purchases are separate. The cap must cover at least one reload. Disabling stops new reloads; already initiated payments can finish.
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- enabled
- threshold
- packs
- monthlyCapCents
properties:
enabled:
type: boolean
threshold:
type: integer
minimum: 20
maximum: 500
packs:
type: integer
minimum: 1
maximum: 10
monthlyCapCents:
type: integer
minimum: 1000
maximum: 100000
multipleOf: 1000
responses:
'200':
description: Settings saved
content:
application/json:
schema:
type: object
required:
- ok
properties:
ok:
const: true
'400':
description: Invalid input
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Signed-in bearer token required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'409':
description: Purchase conflict or saved payment method required
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded; respect Retry-After
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Billing unavailable
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
components:
schemas:
Error:
type: object
properties:
error:
type: string
required:
- error
securitySchemes:
bearerAuth:
type: http
scheme: bearer
bearerFormat: JWT
description: Supabase JWT token
apiKeyAuth:
type: apiKey
in: header
name: X-API-Key
description: API key with wp_sk_ prefix