The Coa Gate API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for coa gate.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Coa Gate 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: Coa Gate
paths:
/api/v1/coa-gate:
post:
operationId: coa_gate
summary: 'Certificate of analysis vs specification: pass, fail or indeterminate per clause'
description: 'Checks the values on a certificate of analysis or test report against specification limits clause by clause (up to 200 clauses), for an agent accepting a lot or a supplier''s material. Each clause has a parameter, an optional min and max and a unit; each result has a value, an optional reported uncertainty and an optional less-than or greater-than qualifier ("<0.01"). rule simple (default): the reported value is compared with the limits and uncertainty is ignored. rule guard-banded: a clause passes only if value +/- uncertainty lies inside the limits, fails only if it lies wholly outside, and is indeterminate when the interval straddles a limit. A missing result, a unit with no supplied conversion, a guard-banded result with no reported uncertainty (state "0" for an exact value), or a censored value that cannot be placed against a limit is indeterminate, never pass. Overall: fail if any clause fails, unknown if any is indeterminate, else pass. Does not validate the laboratory, the method or the certificate''s authenticity.
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/coa-gate
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- clauses
- results
properties:
clauses:
type: array
minItems: 1
maxItems: 200
items:
type: object
required:
- id
- parameter
properties:
id:
type: string
minLength: 1
maxLength: 80
parameter:
type: string
minLength: 1
maxLength: 120
min:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
max:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
unit:
type: string
minLength: 1
maxLength: 24
additionalProperties: false
results:
type: array
maxItems: 400
items:
type: object
required:
- parameter
- value
properties:
parameter:
type: string
minLength: 1
maxLength: 120
value:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: 'Decimal string such as "-12.50" (up to 15 integer and 12 fraction digits). JSON numbers are not accepted: they are binary floats.'
qualifier:
type: string
enum:
- <
- '>'
description: 'Censored result: the true value is below / above `value`.'
uncertainty:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: Expanded uncertainty U (absolute, same unit as value) so the interval is value +/- U.
unit:
type: string
minLength: 1
maxLength: 24
additionalProperties: false
rule:
type: string
enum:
- simple
- guard-banded
conversions:
type: array
maxItems: 50
items:
type: object
required:
- from
- to
- factor
properties:
from:
type: string
minLength: 1
maxLength: 24
to:
type: string
minLength: 1
maxLength: 24
factor:
type: string
pattern: ^-?\d{1,15}(\.\d{1,12})?$
maxLength: 30
description: value in `to` = value in `from` x factor.
additionalProperties: false
description: Caller-supplied unit conversions; none are built in.
example:
rule: guard-banded
clauses:
- id: assay
parameter: Assay
min: '99.0'
unit: '%'
- id: pb
parameter: Lead
max: '0.5'
unit: ppm
- id: water
parameter: Water
max: '0.2'
unit: '%'
results:
- parameter: Assay
value: '99.4'
uncertainty: '0.3'
unit: '%'
- parameter: Lead
value: '0.1'
qualifier: <
unit: ppm
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.'
clauses:
type: array
items:
type: object
properties:
id:
type: string
parameter:
type: string
outcome:
type: string
enum:
- pass
- fail
- indeterminate
detail:
type: string
counts:
type: object
properties:
pass:
type: integer
fail:
type: integer
indeterminate:
type: integer
unusedResults:
type: array
items:
type: string
description: Parameters on the certificate that no clause refers to.
rule:
type: string
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:
- Coa Gate
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