The Svg Geometry API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for svg geometry.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Svg Geometry 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: Svg Geometry
paths:
/api/v1/svg-geometry:
post:
operationId: svg_geometry
summary: 'SVG layout check: clipping, overlaps and empty shapes from supplied geometry'
description: 'Checks up to 200 SVG shapes you describe (rect, circle, ellipse, line, polygon, polyline, text, or a path''s bounding box) against the viewBox and viewport the way an SVG renderer would: finds shapes clipped or entirely outside the drawn region, shapes that render nothing (zero or negative size, unstroked line), partial overlaps between shapes, and a zero, negative or malformed viewBox, for agents that generate diagrams, charts or icons. It does not parse SVG markup or path data, apply transforms, CSS or clip-paths, or render anything; text boxes are ESTIMATES from the character count and font size (no font metrics), and any finding that depends on an estimate or on bounding boxes of round or polygonal shapes yields `unknown`, not `fail`.
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: developer
x-sample-url: https://agents.writerslogic.com/api/v1/samples/svg-geometry
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- shapes
properties:
viewBox:
type: string
maxLength: 120
description: The viewBox attribute value, e.g. "0 0 800 600".
width:
type: number
minimum: 0.001
maximum: 10000000
description: Viewport width in px (the svg width attribute).
height:
type: number
minimum: 0.001
maximum: 10000000
description: Viewport height in px.
preserveAspectRatio:
type: string
maxLength: 40
description: Default xMidYMid meet.
shapes:
type: array
minItems: 1
maxItems: 200
description: 'Shapes in user coordinates (no transform). rect: x,y,width,height. circle: cx,cy,r. ellipse: cx,cy,rx,ry. line: x1,y1,x2,y2,strokeWidth. polygon/polyline: points. text: x,y,text,fontSize,textAnchor. bbox: bbox [minX,minY,maxX,maxY] for a path you measured yourself.'
items:
type: object
additionalProperties: false
required:
- type
properties:
id:
type: string
maxLength: 80
type:
type: string
enum:
- rect
- circle
- ellipse
- line
- polygon
- polyline
- text
- bbox
x:
type: number
minimum: -1000000000
maximum: 1000000000
y:
type: number
minimum: -1000000000
maximum: 1000000000
width:
type: number
minimum: -1000000000
maximum: 1000000000
height:
type: number
minimum: -1000000000
maximum: 1000000000
cx:
type: number
minimum: -1000000000
maximum: 1000000000
cy:
type: number
minimum: -1000000000
maximum: 1000000000
r:
type: number
minimum: -1000000000
maximum: 1000000000
rx:
type: number
minimum: -1000000000
maximum: 1000000000
ry:
type: number
minimum: -1000000000
maximum: 1000000000
x1:
type: number
minimum: -1000000000
maximum: 1000000000
y1:
type: number
minimum: -1000000000
maximum: 1000000000
x2:
type: number
minimum: -1000000000
maximum: 1000000000
y2:
type: number
minimum: -1000000000
maximum: 1000000000
points:
type: array
maxItems: 200
items:
type: array
minItems: 2
maxItems: 2
items:
type: number
minimum: -1000000000
maximum: 1000000000
strokeWidth:
type: number
minimum: 0
maximum: 1000000
bbox:
type: array
minItems: 4
maxItems: 4
items:
type: number
minimum: -1000000000
maximum: 1000000000
text:
type: string
maxLength: 500
fontSize:
type: number
minimum: 0
maximum: 100000
textAnchor:
type: string
enum:
- start
- middle
- end
checks:
type: array
maxItems: 3
items:
type: string
enum:
- clip
- empty
- overlap
description: Subset of clip, empty, overlap; default all. Overlap reports partial overlaps only; a shape fully inside another (a label on a card) is listed as nested and never fails.
example:
viewBox: 0 0 200 100
shapes:
- id: card
type: rect
x: 10
y: 10
width: 120
height: 60
- id: badge
type: circle
cx: 120
cy: 40
r: 25
- id: title
type: text
x: 150
y: 90
text: Quarterly revenue
fontSize: 14
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.'
visibleRegion:
type: array
items:
type: number
description: '[minX, minY, maxX, maxY] in user units that the viewport displays; empty when it cannot be determined.'
visibleNote:
type: string
shapes:
type: array
items:
type: object
properties:
index:
type: integer
id:
type: string
bbox:
type: array
items:
type: number
estimate:
type: boolean
description: true for text boxes (character-count estimate).
placement:
type: string
enum:
- inside
- partial
- outside
- unknown
pairs:
type: array
items:
type: object
properties:
a:
type: integer
b:
type: integer
relation:
type: string
enum:
- partial
- nested
exact:
type: boolean
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:
- Svg Geometry
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