Overshoot Billing API
Pricing, prepaid balance, and checkout.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Inference Service Billing API
version: 0.4.0
description: Pricing, prepaid balance, and checkout.
servers:
- url: https://api.overshoot.ai/v1beta
description: Base URL declared by the provider in apis.yml (roadmap#122).
tags:
- name: Billing
description: Pricing, prepaid balance, and checkout.
paths:
/billing/pricing:
get:
tags:
- Billing
operationId: listPricing
summary: List pricing
description: 'List public model prices. No auth required. Money fields use **integer microcents**:
`1 cent = 1,000,000 microcents`.
'
security: []
servers:
- url: https://api.overshoot.ai
responses:
'200':
description: List of public prices.
content:
application/json:
schema:
type: array
items:
$ref: '#/components/schemas/Pricing'
/billing/pricing/{model}:
get:
tags:
- Billing
operationId: getPricing
summary: Get model pricing
description: Return pricing for one model. The `model` path may contain slashes.
security: []
servers:
- url: https://api.overshoot.ai
parameters:
- name: model
in: path
required: true
schema:
type: string
description: Model identifier (may contain `/`).
responses:
'200':
description: Pricing for the requested model.
content:
application/json:
schema:
$ref: '#/components/schemas/Pricing'
'404':
description: Price not found.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
/billing/accounts/me/balance:
get:
tags:
- Billing
operationId: getBalance
summary: Get prepaid balance
description: 'Return the authenticated user''s prepaid balance. `balance_cents` is for display;
`balance_microcents` is the exact billing unit. Inference can return `402` when
billing denies a request.
'
servers:
- url: https://api.overshoot.ai
responses:
'200':
description: Current balance.
content:
application/json:
schema:
$ref: '#/components/schemas/BalanceResponse'
'401':
description: Missing or invalid API key.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
/billing/checkout:
post:
tags:
- Billing
operationId: createCheckout
summary: Create checkout session
description: 'Create a checkout session for buying prepaid credits. `amount_cents` must be at
least `100`.
'
servers:
- url: https://api.overshoot.ai
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/CheckoutRequest'
responses:
'200':
description: Checkout URL.
content:
application/json:
schema:
$ref: '#/components/schemas/CheckoutResponse'
'401':
description: Missing or invalid API key.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'422':
description: Validation error.
content:
application/json:
schema:
$ref: '#/components/schemas/ValidationError'
components:
schemas:
Error:
type: object
description: Standard error body used by stream-lifecycle and billing endpoints.
properties:
detail:
type: string
required:
- detail
BalanceResponse:
type: object
properties:
user_id:
type: string
format: uuid
balance_microcents:
type: integer
description: Exact billing unit. `1 cent = 1,000,000 microcents`.
balance_cents:
type: integer
description: Display value.
required:
- user_id
- balance_microcents
- balance_cents
Pricing:
type: object
properties:
id:
type: string
format: uuid
model:
type: string
example: google/gemma-4-26B-A4B-it
provider:
type: string
example: google
version:
type: string
example: '2026-06-01'
input_microcents_per_token:
type: integer
example: 10
output_microcents_per_token:
type: integer
example: 40
cached_input_microcents_per_token:
type: integer
example: 2
public:
type: boolean
example: true
required:
- id
- model
- provider
- version
- input_microcents_per_token
- output_microcents_per_token
- public
ValidationError:
type: object
description: Validation failure shape used by chat completions and billing.
properties:
error:
type: string
example: validation_error
message:
type: string
example: Request validation failed
details:
type: array
items:
type: object
properties:
loc:
type: array
items:
type: string
msg:
type: string
type:
type: string
CheckoutRequest:
type: object
properties:
amount_cents:
type: integer
minimum: 100
description: Amount to charge, in cents. Must be at least `100`.
required:
- amount_cents
CheckoutResponse:
type: object
properties:
url:
type: string
description: Hosted checkout URL.
required:
- url
securitySchemes:
API_Key:
type: http
description: Bearer <api_key>
scheme: bearer