The Allergen Flag API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for allergen flag.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Allergen Flag 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: Allergen Flag
paths:
/api/v1/allergen-flag:
post:
operationId: allergen_flag
summary: Allergen flags in an ingredient list (EU Annex II, US FALCPA + FASTER Act)
description: 'Scans an ingredient list for terms tied to the 14 allergens of EU Regulation 1169/2011 Annex II and the 9 US major food allergens (FALCPA plus sesame under the FASTER Act), for an agent or buyer checking a label or recipe. Returns each matched span with its character offsets, the allergen, the regime that lists it, and whether it sits in a ''may contain'' clause. Pass the allergens a label declares to get a fail for any detected but undeclared one. These are flags, not advice: matching is a lexicon of terms quoted from the regulation and FDA guidance, so an absent match does not show an ingredient is free of an allergen. It does NOT judge cross-contact risk, quantities (the EU sulphite threshold of 10 mg/kg), refining exemptions, or compliance of a label.
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: business
x-sample-url: https://agents.writerslogic.com/api/v1/samples/allergen-flag
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- ingredients
properties:
ingredients:
type: string
maxLength: 20000
description: Ingredient list or label text, at most 20000 characters.
jurisdictions:
type: string
enum:
- eu
- us
- both
description: Which list(s) to apply. Default both. EU adds celery, mustard, lupin, molluscs, sulphites and gluten cereals (rye, barley, oats); the US list has no such entries.
declared:
type: array
items:
type: string
enum:
- milk
- egg
- fish
- crustacean
- mollusc
- peanut
- tree-nut
- wheat
- gluten-cereal
- soy
- sesame
- celery
- mustard
- lupin
- sulphites
maxItems: 15
description: Allergen keys the label declares. Any detected, non-precautionary allergen missing from this list fails. For jurisdictions=eu, wheat and gluten-cereal cover each other (one Annex II entry).
extraTerms:
type: array
items:
type: object
properties:
term:
type: string
maxLength: 60
description: Extra term, at most 6 words.
allergen:
type: string
enum:
- milk
- egg
- fish
- crustacean
- mollusc
- peanut
- tree-nut
- wheat
- gluten-cereal
- soy
- sesame
- celery
- mustard
- lupin
- sulphites
required:
- term
- allergen
maxItems: 100
description: Caller synonyms (for example a brand's own ingredient name), matched as literal words.
example:
ingredients: Wheat flour, skimmed milk powder, soy lecithin, sesame seeds. May contain nuts.
declared:
- wheat
- milk
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.'
jurisdictions:
type: array
items:
type: string
tokenCount:
type: integer
description: Words scanned.
matches:
type: array
items:
type: object
properties:
allergen:
type: string
enum:
- milk
- egg
- fish
- crustacean
- mollusc
- peanut
- tree-nut
- wheat
- gluten-cereal
- soy
- sesame
- celery
- mustard
- lupin
- sulphites
term:
type: string
description: The lexicon term matched.
text:
type: string
description: The matched text as written.
start:
type: integer
description: UTF-16 offset of the span start.
end:
type: integer
description: UTF-16 offset of the span end (exclusive).
regimes:
type: array
items:
type: string
kind:
type: string
description: category, example, derivative, synonym, e-number or caller.
source:
type: string
description: Which source the term comes from.
precautionary:
type: boolean
description: True when a 'may contain' / 'traces of' / shared-facility phrase precedes it in the same sentence (heuristic phrase list).
allergens:
type: array
items:
type: object
properties:
allergen:
type: string
enum:
- milk
- egg
- fish
- crustacean
- mollusc
- peanut
- tree-nut
- wheat
- gluten-cereal
- soy
- sesame
- celery
- mustard
- lupin
- sulphites
listedIn:
type: array
items:
type: string
references:
type: object
description: 'Per regime: the legal entry that lists this allergen.'
matchCount:
type: integer
firstOffset:
type: integer
precautionaryOnly:
type: boolean
notes:
type: array
items:
type: string
description: Exceptions and caveats quoted from the regulation or FDA guidance for this allergen.
undeclared:
type: array
items:
type: string
description: Detected, non-precautionary allergens missing from declared (only when declared is given).
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:
- Allergen Flag
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