The Font Convert API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for font convert.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Font Convert 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: Font Convert
paths:
/api/v1/font-convert:
post:
operationId: font_convert
summary: 'Font converter: TTF/OTF, WOFF and WOFF2 containers, with the font''s own…'
description: 'Repackages a font you supply as base64 (up to 2 MB) between the sfnt (.ttf/.otf), WOFF and WOFF2 containers, for an agent or build step that needs a web font in a particular format: every table is carried over unchanged, the result is read back and its table digest compared with the source, and the font''s own OS/2 embedding bits are checked first (a restricted font fails and nothing is returned). It does not convert outlines (TrueType to CFF or back), subset, hint, optimise or rename a font, does not read font collections (.ttc), and a declared embedding permission is not legal advice. WOFF2 output is not size-optimal: glyf, loca and hmtx are stored untransformed.
Price: 0.01 USDC on Base (x402).'
x-x402-price-usdc: '0.01'
x-x402-amount: '10000'
x-payment-info:
protocols:
- x402
price:
mode: fixed
currency: USD
amount: '0.01'
x-audience: business
x-sample-url: https://agents.writerslogic.com/api/v1/samples/font-convert
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- fontBase64
- to
properties:
fontBase64:
type: string
minLength: 8
maxLength: 2796204
description: Base64 of a .ttf, .otf, .woff or .woff2 file (not a .ttc collection), up to 2 MB.
to:
type: string
enum:
- sfnt
- woff
- woff2
description: Target container. sfnt is the plain .ttf/.otf file.
example:
fontBase64: 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
to: woff2
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.'
sourceFormat:
anyOf:
- type: string
enum:
- ttf/otf
- woff
- woff2
- type: 'null'
outline:
anyOf:
- type: string
enum:
- truetype
- cff
- other
description: Outline flavor of the sfnt inside the container; this tool never changes it.
- type: 'null'
targetFormat:
type: string
enum:
- ttf/otf
- woff
- woff2
fontBase64:
anyOf:
- type: string
description: The converted font; null when the licence check failed or the input could not be read.
- type: 'null'
bytes:
anyOf:
- type: integer
- type: 'null'
sha256:
anyOf:
- type: string
description: SHA-256 of the converted file.
- type: 'null'
fontDigest:
anyOf:
- type: string
description: SHA-256 over every table's tag and content digest (head.checkSumAdjustment zeroed). Identical for a font in any container, so it proves that only the container changed.
- type: 'null'
tables:
type: array
items:
type: string
family:
anyOf:
- type: string
- type: 'null'
licence:
anyOf:
- type: object
description: What the font file itself declares about embedding (OS/2 fsType and name IDs 13/14). A declaration in the file, not legal advice and not a licence.
properties:
declared:
type: boolean
description: False when the font has no OS/2 table, so no embedding permission is declared.
fsType:
anyOf:
- type: integer
- type: 'null'
restricted:
type: boolean
description: 'fsType bit 0x0002: the vendor forbids embedding.'
previewPrintOnly:
type: boolean
description: 'fsType permission 0x0004 alone: preview and print embedding only.'
ambiguous:
type: boolean
description: Conflicting permission bits (for example restricted with another bit set) or the deprecated bit 0; the OS/2 specification does not give one answer.
noSubsetting:
type: boolean
bitmapOnly:
type: boolean
license:
anyOf:
- type: string
description: name ID 13
- type: 'null'
licenseUrl:
anyOf:
- type: string
description: name ID 14
- type: 'null'
- type: 'null'
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:
- Font Convert
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