The Acceptance Receipt API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for acceptance receipt.
Every API here is available over the APIs.io API and to AI agents over MCP.
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
find_apisBrowse and filter every API in the catalog.get_api_artifactsOne API's artifacts, grouped by type.get_openapiThe primary OpenAPI for this API.find_similar_apisAPIs that look like this one.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.curl "https://apis.io/api/v1/apis/writerslogic-com:writerslogic-com-acceptance-receipt-api"curl "https://apis.io/api/v1/apis?limit=25"Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.
Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.
A second provider on the same verified email joins the account you already have.
openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Acceptance Receipt 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: Acceptance Receipt
paths:
/api/v1/acceptance-receipt:
post:
operationId: acceptance_receipt
summary: 'Signed acceptance receipt: which deterministic tests a delivered output passed'
description: 'Runs your deterministic acceptance tests (equals, exists, absent, type, contains, length and number ranges, one-of, sha256, a JSON Schema subset) against a sub-agent''s or vendor''s JSON output at JSON Pointer paths, and returns per-test results plus a hub-signed receipt over the output hash, the tests hash and the results. Use it before paying for delegated work or releasing the next step. It certifies that these tests passed on these bytes, not that the output is semantically right.
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: agent-infra
x-sample-url: https://agents.writerslogic.com/api/v1/samples/acceptance-receipt
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- output
- tests
properties:
output:
description: The delivered JSON (at most 262144 bytes as JCS).
tests:
type: array
minItems: 1
maxItems: 100
items:
type: object
additionalProperties: false
required:
- id
- kind
properties:
id:
type: string
pattern: ^[A-Za-z0-9_.:-]{1,64}$
kind:
type: string
enum:
- equals
- not-equals
- exists
- absent
- type
- contains
- length-between
- number-between
- one-of
- sha256
- schema
path:
type: string
maxLength: 500
description: RFC 6901 JSON Pointer into output; empty or omitted = the whole output.
value:
description: 'equals/not-equals/contains: the JSON value; type: a JSON type name; one-of: an array; sha256: lowercase hex; schema: a hub-subset JSON Schema.'
min:
type: number
max:
type: number
label:
type: string
maxLength: 200
description: Free text bound into the receipt, e.g. the task id.
example:
output:
invoiceId: INV-1009
total: 1250
lines:
- sku: A1
qty: 2
tests:
- id: has-id
kind: exists
path: /invoiceId
- id: total-range
kind: number-between
path: /total
min: 1
max: 5000
- id: one-line
kind: length-between
path: /lines
min: 1
max: 50
label: task-42
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.'
passed:
type: integer
failed:
type: integer
results:
type: array
items:
type: object
properties:
id:
type: string
kind:
type: string
path:
type: string
passed:
type: boolean
actual:
description: The inspected value, or its first 200 characters when longer.
detail:
type: string
inconclusive:
type: boolean
description: True when a schema pattern test ran out of its work budget; the call is then unknown, never pass.
outputHash:
type: string
testsHash:
type: string
receiptBody:
type: object
receipt:
type: object
description: 'Standalone receipt: recompute digest from `receiptBody`, then recover the EIP-191 signer and compare with the DID document''s attestation key. signature is null when the hub has no attestation key configured.'
properties:
digest:
type: string
scheme:
type: string
signature:
anyOf:
- type: string
- type: 'null'
signer:
anyOf:
- type: string
- 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:
- Acceptance Receipt
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