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Vevang AI Output Verifier
x402
Vevang AI Output Verifier is a paid API for AI agents from verifier.vevang.com, paid per call via x402, $1/call, status unknown (last checked 2026-10-01).
Independently verifies whether an AI-generated deliverable (URL or inline content) satisfies a given spec before payment is released in machine-to-machine commerce.
Price / call$1
Success—
StatusUnknown
How this service works
AI Output Verifier — independently verify another agent's deliverable meets its spec BEFORE you pay for it. POST JSON: deliverable (URL or content) + spec. Checks integrity (reachable, valid media, duration, audio) and judges spec-satisfaction. Returns {passed, score, checks, issues}. The trust layer for machine-to-machine commerce.
Output
Returns a JSON object containing: `passed` (boolean indicating overall pass/fail), `score` (numeric satisfaction score), `checks` (list of individual check results covering reachability, media validity, duration, audio, and spec satisfaction), and `issues` (list of specific problems found). Gives an agent a structured, auditable verdict on whether a deliverable is acceptable.
Example use cases
Pre-payment video deliverable check
“The freelance AI agent just sent me a video at https://deliveries.example.com/promo.mp4 — before I approve payment, verify it meets my spec: '30-second product promo video with background music, 1080p, MP4 format'. Tell me if it passes and flag any issues.”
Text content spec compliance audit
“I need you to verify this blog post draft — here's the content inline — against my spec: '800-word SEO article about blockchain for beginners, written in plain English with at least 3 subheadings'. Does it pass?”
Automated agent pipeline quality gate
“Our pipeline just received a deliverable URL from a sub-agent at https://outputs.aiworkflow.io/report.pdf — run a verification against the spec 'a 5-page financial summary report in PDF covering Q3 2024 metrics' and return the score and any failing checks so we can decide whether to proceed.”
Technical details
Endpoint
POSThttps://verifier.vevang.com/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs an independent, third-party verification of another agent's output before releasing payment or proceeding in a pipeline — especially in x402 machine-to-machine commerce flows. Prefer it over manual review when the deliverable is a URL-hosted file (video, audio, document) or inline text that must be checked for reachability, media integrity, and spec compliance in a single automated step. It is the right choice when auditability and a structured pass/fail score matter more than subjective human review.
Side effects
- Deliverable URL is unreachable or returns a non-200 response — check will fail with reachability error
- Invalid or unsupported media type at the given URL — media validity check fails
- Spec string is missing or too vague for meaningful judgment — score may be unreliable
- Network timeout fetching the deliverable — returns error or failed check
- Inline content too large for the request body — request may be rejected
- Ambiguous deliverable kind causes misclassification — use explicit `kind` enum to avoid
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| kind | string | deliverable type (auto-detected if omitted) |
| spec | string | What it must satisfy (the brief/requirements) |
| deliverable | string | URL or inline content of the deliverable to verify |
Tags
x402
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