# Deliverable Verification & Validation Service

> Deliverable Verification & Validation Service is a paid API for AI agents from fastapi-service-5ag4.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-23).

Validates agent-produced deliverables against a JSON Schema plus business rules (totals matching, unique IDs), returning a pass/fail verdict, percentage of checks passed, fix hints, and a signed receipt.

## Facts

- Endpoint: POST https://fastapi-service-5ag4.onrender.com/verify/deliverable?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/deliverable-verification-validation-service-a3f55b48
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2r5RELPOYWHyoRcnugto-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability deliverable-verification-validation-service-a3f55b48 -d '<json body>'
```

Example prompt: Before I approve this invoice the agent just generated, run it through the deliverable verifier with my JSON Schema and check that all line-item totals match and every ID is unique — give me a pass/fail, the percentage of checks that passed, and any fix hints if something's wrong.

## When to prefer this

Choose this endpoint when you need an independent, auditable check of an AI agent's structured output before accepting or paying for it — especially when business rules like matching totals or unique ID constraints matter and a signed receipt of validation is required. Prefer it over manual review or generic JSON validators when you need both schema conformance and semantic business-rule checks in a single call with a tamper-evident receipt.

## Known failure modes

- Invalid or malformed JSON Schema provided — returns validation error on the schema itself
- Deliverable payload is not valid JSON — parsing error returned
- Business rules are ambiguous or conflict — partial evaluation with error detail
- Network timeout on Render cold-start (free tier spin-up latency)
- Payment not settled via x402 — request rejected before validation runs

## How this service works

Check agent output before you accept or pay for a deliverable: your JSON Schema plus rules like totals matching and unique IDs. Pass/fail, % of checks passed, fix hints and a signed receipt. $0.02 USDC, no signup, x402 v2.

## Output

Returns a pass/fail verdict, a percentage score representing how many checks passed, human-readable fix hints describing which rules failed and how to correct them, and a cryptographically signed receipt confirming the validation run.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/deliverable-verification-validation-service-a3f55b48/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fastapi-service-5ag4.onrender.com](https://www.zero.xyz/host/fastapi-service-5ag4.onrender.com/llms.txt)