The Conformance API from SCVD General Store — 2 operation(s) for conformance.
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openapi: 3.2.0
info:
title: SCVD General Store Conformance API
version: 0.3.0
description: 'scvd.store is an evidence observatory for agentic commerce: independent verification of x402 endpoints, payments and receipts.'
contact:
url: https://scvd.store
email: sean@recordcreativeco.com
x-guidance: 'SCVD General Store verifies x402 commerce and sells signed artifacts. Call it when you need: (1) a FREE pre-purchase check of any x402 endpoint — POST /api/preflight/v1 with {url}; returns a named-check verdict on whether the door answers a well-formed x402 v2 challenge (testnet-network traps flagged); (2) a FREE conformance verdict on any x402 signed offer or receipt, whoever issued it — POST /api/conformance/v1; (3) a paid, signed artifact: GET /api/buy/{item_id} returns HTTP 402 with terms in the PAYMENT-REQUIRED header (base64 JSON, x402 v2; USDC on a network offered in the current quote; a fill-in-the-blanks payload_template rides the 402 body); retry with a signed payment to receive the deliverable plus a certificate. Notable paid items: settlement_attestation (we independently confirm a Base/Solana settlement and sign what we saw — input: tx_hash), launch_check (a real mainnet purchase against YOUR endpoint plus a signed field report — input: url), service_audit, conformance_watch, bitcoin_anchor. Inputs are query parameters, declared per item in /menu.json; outputs are JSON with a certificate id. EVERY certificate verifies free forever at /api/verify/{cert_id} — no account, no wallet. Starting prices run $0.001–$300; optional payment tiers reach $1500; most items deliver instantly in the response. Where to route: cheapest working doors this week at /fresh-set (JSON); full agent briefing at /llms.txt. Before you start: free instruments need only plain HTTPS (no account, key or SDK); a purchase needs an x402 v2 client and a wallet holding USDC on Base (eip155:8453), Polygon (eip155:137), Arbitrum (eip155:42161), World (eip155:480), Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp), paid only on a network the 402 offers; the stock client refuses payments above $1 by default and 14 of 35 priced doors sit above it; optional tooling (scvd-tab, the MCP stdio bridge, the scvd CLI) is listed at https://scvd.store/agents.md and none of it is required.'
servers:
- url: https://scvd.store
tags:
- name: Conformance
paths:
/api/conformance/v1/fixtures:
get:
summary: Signed envelope fixtures for fail-closed integrations
description: Complete artifacts with real production signatures — valid, expired, tampered, and unknown-signer cases — each with the exact canonical string its signature covers, the exact desk call to make, and the verdict it returns. Every fixture is re-verified against the live desk before serving. Pin the set digest; build and test an integration without paying anything.
security: []
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
required:
- what_this_is
- version
- fixtures
- fixture_set_digest
- digest_rule
properties:
what_this_is:
type: string
version:
type: string
fixture_set_digest:
type: string
digest_rule:
type: string
description: How to recompute the digest above from the fixtures below, without asking us.
fixtures:
type: array
items:
type: object
required:
- id
- artifact
- expect
properties:
id:
type: string
artifact:
type: string
canonical_signed_input:
type: string
payload:
type: object
call:
type: object
expect:
type: object
description: What a conformant implementation must answer for this vector.
note:
type: string
how_to_integrate_fail_closed:
type: array
items:
type: string
description: A conformance check wired to pass when it errors is worse than no check.
signer_registry:
type: object
properties:
did:
type: string
signing_key_url:
type: string
format: uri
did_json_url:
type: string
format: uri
public_key_hex:
type: string
'304':
$ref: '#/components/responses/NotModified'
'400':
$ref: '#/components/responses/BadRequest'
'404':
$ref: '#/components/responses/NotFound'
'429':
$ref: '#/components/responses/TooManyRequests'
'500':
$ref: '#/components/responses/ServerError'
operationId: get_api_conformance_v1_fixtures
parameters:
- name: If-None-Match
in: header
required: false
schema:
type: string
description: Conditional GET. Send the ETag a previous answer carried (a SHA-256 of the exact bytes served, not a version somebody maintains) and an unchanged document answers 304 with no body. Send it on a schedule instead of re-downloading what you already hold.
tags:
- Conformance
/api/conformance/v1:
get:
summary: The conformance desk, described
description: What the free desk is and the exact request shape, as JSON. The readable landing is /conformance.
security: []
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
required:
- title
- version
- summary
- method
- url
- what_it_checks
- what_it_cannot_tell_you
- our_conflict_of_interest
- run_it_yourself
properties:
title:
type: string
version:
type: string
summary:
type: string
method:
type: string
description: The verb that runs it.
url:
type: string
format: uri
request:
type: object
description: The body shape, stated where a caller is already looking.
rate_limit:
type: string
description: What is metered and what is not, in words — the RateLimit headers say it again on every answer.
what_it_checks:
type: array
items:
type: string
description: Every named check, so a verdict can be read against them.
contract:
type: string
required_fields:
type: object
description: What an offer and a receipt must carry to be well-formed.
what_it_cannot_tell_you:
type: array
items:
type: string
our_conflict_of_interest:
type: string
description: Stated on the desk itself, because the desk checks competitors' artifacts too.
run_it_yourself:
type: string
description: How to reproduce every verdict offline, without us.
why_it_is_free:
type: string
mailbox:
type: string
'304':
$ref: '#/components/responses/NotModified'
'400':
$ref: '#/components/responses/BadRequest'
'404':
$ref: '#/components/responses/NotFound'
'429':
$ref: '#/components/responses/TooManyRequests'
'500':
$ref: '#/components/responses/ServerError'
operationId: get_api_conformance_v1
parameters:
- name: Accept
in: header
required: false
schema:
type: string
enum:
- application/json
- text/markdown
- text/html
description: 'This door negotiates: application/json, text/markdown, text/html, parsed with q-values (RFC 9110 §12.5.1). A bare wildcard or no header gets application/json; a named AI reader that states no preference gets markdown where it is offered. The answer carries Vary.'
- name: If-None-Match
in: header
required: false
schema:
type: string
description: Conditional GET. Send the ETag a previous answer carried (a SHA-256 of the exact bytes served, not a version somebody maintains) and an unchanged document answers 304 with no body. Send it on a schedule instead of re-downloading what you already hold.
tags:
- Conformance
post:
summary: Check any issuer's x402 signed offer or receipt
description: Structured verdict — parse, schema, EdDSA signature against the kid, liveness — free, no wallet, no account. Works on artifacts this store did not issue; supply public_key_hex to keep it fully offline.
security: []
responses:
'200':
description: OK
content:
application/json:
schema:
type: object
required:
- version
- verdict
- checks
- what_this_means
- what_this_cannot_tell_you
- our_conflict_of_interest
- run_it_yourself
properties:
version:
type: string
verdict:
type: string
description: The dated observation, never a ranking.
kind:
type:
- string
- 'null'
description: Offer or receipt, once the artifact parses well enough to tell. Null when it does not.
checks:
type: array
items:
type: object
description: Every named check and what it found — the same list whether the verdict is yes or no.
live:
type:
- object
- 'null'
description: A live reading where one was taken; null where none was.
liveness:
type: string
key_resolution:
type: string
description: How the issuer's key was found, or why it was not.
anchored_key_history:
type:
- object
- 'null'
what_this_means:
type: string
what_this_cannot_tell_you:
type: array
items:
type: string
description: Published beside the verdict, counted against us.
our_conflict_of_interest:
type: string
description: Stated on every verdict, including verdicts on competitors' artifacts.
run_it_yourself:
type: string
description: How to reproduce this offline, without us.
'400':
$ref: '#/components/responses/BadRequest'
'404':
$ref: '#/components/responses/NotFound'
'429':
$ref: '#/components/responses/TooManyRequests'
'500':
$ref: '#/components/responses/ServerError'
requestBody:
required: true
description: The artifact, plus whichever of the three switches you want.
content:
application/json:
schema:
type: object
required:
- artifact
additionalProperties: false
properties:
artifact:
type: string
description: 'The compact JWS: three base64url segments, dot-separated.'
kind:
type: string
enum:
- offer
- receipt
description: Optional. Inferred from the payload when omitted.
public_key_hex:
type: string
description: Optional. The issuer's ed25519 public key as hex. Supplying it keeps the check fully offline — no did:web resolution, no outbound request in your name, and no budget spent.
resolve_kid:
type: boolean
description: Optional. Resolve the artifact's kid over the network to find the key. Costs a budgeted outbound request to a host the artifact names.
check_anchor:
type: boolean
description: Optional. Also check any timestamp anchor the artifact claims.
operationId: post_api_conformance_v1
tags:
- Conformance
components:
responses:
NotFound:
description: No such resource. The body names where to look instead.
content:
application/problem+json:
schema:
$ref: '#/components/schemas/Problem'
application/json:
schema:
$ref: '#/components/schemas/Problem'
ServerError:
description: Something fell off a shelf. Nothing was charged.
content:
application/problem+json:
schema:
$ref: '#/components/schemas/Problem'
application/json:
schema:
$ref: '#/components/schemas/Problem'
TooManyRequests:
description: 'Too many requests, from the edge rather than from the store''s own logic. Retry after the interval named in Retry-After; the store does not charge for a refusal. The free preflight is limited — 30 probes per isolate per minute, 60 global — because it spends outbound requests to a host the caller chooses. Every answer the limiter METERED carries the IETF RateLimit fields — the 200 and the 429 — so you can pace against the live number instead of discovering the ceiling by being refused: RateLimit-Limit / -Remaining / -Reset report whichever of the two buckets is closer to binding, and RateLimit / RateLimit-Policy name both. Past either ceiling it returns 429 with Retry-After. A validation refusal (400, e.g. a missing or unprobeable URL) returns BEFORE either bucket is touched and carries no RateLimit fields, because a malformed request never spent a probe; this contract used to declare them on those responses too, which described a header that had never been sent. No other operation enforces an application-level ceiling, and so returns no RateLimit headers: declaring a ceiling nothing enforces would be worse than declaring none. A 429 can also arrive from the edge under abuse conditions. A refused request is never charged for. The two figures above are read from the limiter''s own constants, not restated here — this string asserted that NO limit existed for a day after one shipped.'
content:
application/problem+json:
schema:
$ref: '#/components/schemas/Problem'
application/json:
schema:
$ref: '#/components/schemas/Problem'
headers:
Retry-After:
schema:
type: integer
description: Seconds to wait before retrying.
NotModified:
description: 'Not Modified: the ETag you sent still names these exact bytes. No body; every other header is as the 200 would carry it.'
BadRequest:
description: The request was malformed or a required parameter was missing.
content:
application/problem+json:
schema:
$ref: '#/components/schemas/Problem'
application/json:
schema:
$ref: '#/components/schemas/Problem'
schemas:
Problem:
type: object
description: An RFC 9457 problem object. `error` is the store's long-standing human-readable field and is always present; the RFC fields sit beside it.
properties:
type:
type: string
format: uri
description: A URI identifying the problem class. Dereferenceable at this origin where one exists.
title:
type: string
description: A short, stable summary of the problem class.
status:
type: integer
description: The HTTP status code, repeated in the body.
detail:
type: string
description: What went wrong with THIS request, in plain language.
instance:
type: string
format: uri
description: The request path.
error:
type: string
description: The store's human-readable message. Always present, including on responses that predate the typed model.
retry_same_request:
type: boolean
const: false
description: 'Present on repair responses: correct the selection or inputs before retrying.'
next_step:
type: object
description: Optional free read after a refusal. Catalog and input repairs also include an equivalent MCP read. No payment or buyer arguments are forwarded.
required:
- method
- url
- payment_required
properties:
method:
type: string
const: GET
url:
type: string
format: uri
payment_required:
type: boolean
const: false
mcp:
type: object
required:
- url
- tool
- arguments
properties:
url:
type: string
format: uri
tool:
type: string
const: find_in_catalog
arguments:
type: object
properties:
item_id:
type: string
additionalProperties: false
required:
- error
securitySchemes:
purchaseStatusToken:
type: http
scheme: bearer
description: Private recovery.status_token returned by a catalogue purchase. This capability reads only its original purchase status.
externalDocs:
url: https://scvd.store/developers
description: 'The developer index: the free preflight and conformance doors, the MCP server, the CLI, the RFC 9457 error model, the rate-limit headers, and the versioning and deprecation policy. The full agent briefing is at /llms.txt.'
x-agentcash-provenance:
ownershipProofs:
- '0xd0716b334368fed445d000f12c7e586a6c86e13bd543333bab6c04695df236320c5dbfa4f0beb6807cc486c0ed4fd5a38892a8148d5aa80377db9f35ed4c4b151c'
- 4HduymBCHhwyLgtMyXRpDX3JHQR3oyqTSytsXqCamzCc4ed9fJeBSpDUDSLwfZ59mZaw9ggdMNURPNBi4P6BRU47
x-scvd-ucp:
profile: https://scvd.store/.well-known/ucp
checkout: advertised
x-scvd-native-checkout:
mcp:
protocol: mpp
payment_method: evm
intent: charge
transport: mcp
method: tools/call
path: /mcp
challenge_key: org.paymentauth/payment-required
challenge_location: error.data, or result._meta with ?payment=tool-result
credential_meta_key: org.paymentauth/credential
receipt_meta_key: org.paymentauth/receipt
idempotency_meta_key: x402/idempotency-key
terms: 'each item''s payment_capabilities row with transport http: same network, asset and amount_atomic'
webmcp:
protocol: mpp
payment_method: evm
intent: charge
transport: webmcp
script: /webmcp.js
quote_tool: quote_store_purchase
challenge_field: payment_challenge
complete_tool: complete_store_purchase
credential_argument: signed_credential
receipt_field: payment_receipt
terms: 'each item''s payment_capabilities row with transport http: same network, asset and amount_atomic'
x-rate-limiting:
application_level_limit: true
limited_paths:
- /api/preflight/v1
- /api/preflight/v2
- /api/before-you-pay/v1
- /api/look/v1
- /api/preflight/batch
headers_returned:
- RateLimit-Limit
- RateLimit-Remaining
- RateLimit-Reset
- RateLimit-Policy
- RateLimit
note: 'The free preflight is limited — 30 probes per isolate per minute, 60 global — because it spends outbound requests to a host the caller chooses. Every answer the limiter METERED carries the IETF RateLimit fields — the 200 and the 429 — so you can pace against the live number instead of discovering the ceiling by being refused: RateLimit-Limit / -Remaining / -Reset report whichever of the two buckets is closer to binding, and RateLimit / RateLimit-Policy name both. Past either ceiling it returns 429 with Retry-After. A validation refusal (400, e.g. a missing or unprobeable URL) returns BEFORE either bucket is touched and carries no RateLimit fields, because a malformed request never spent a probe; this contract used to declare them on those responses too, which described a header that had never been sent. No other operation enforces an application-level ceiling, and so returns no RateLimit headers: declaring a ceiling nothing enforces would be worse than declaring none. A 429 can also arrive from the edge under abuse conditions. A refused request is never charged for. The two figures above are read from the limiter''s own constants, not restated here — this string asserted that NO limit existed for a day after one shipped.'
policy_url: https://scvd.store/developers
x-versioning:
scheme: url-path
note: 'Breaking changes arrive as a new version in the path (/api/preflight/v1 → /v2). A published version''s SHAPE never changes under a client: fields are added, never removed or retyped.'
deprecation: A version being retired serves the RFC 8594 Deprecation and Sunset headers on every response for at least 90 days before it stops answering, and the date is published at /developers before the headers appear.
sunset_headers:
- Deprecation
- Sunset
- Link; rel="successor-version"
policy_url: https://scvd.store/deprecation
currently_deprecated: []
versions:
- path: /api/preflight/v1
status: supported
since: '2026-08-03'
sunset: null
successor: /api/preflight/v2
- path: /api/preflight/v2
status: current
since: '2026-08-23'
sunset: null
successor: null
- path: /api/look/v1
status: current
since: '2026-09-02'
sunset: null
successor: null
- path: /api/conformance/v1
status: current
since: '2026-08-03'
sunset: null
successor: null