# agent.alexweb.space Deep Verify

> agent.alexweb.space Deep Verify is a paid API for AI agents from agent.alexweb.space, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).

Runs a four-pass independent and adversarial verification pipeline to assess agent-generated outputs against a task and optional hard constraints.

## Facts

- Endpoint: POST https://agent.alexweb.space/v1/deep-verify
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-alexweb-space-deep-verify-4163dfd6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_o74hIcvGCX42QM1Z0m15p

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 agent-alexweb-space-deep-verify-4163dfd6 -d '<json body>'
```

Example prompt: Run a deep four-pass adversarial verification on this candidate answer — the original task was 'summarize the Q3 earnings report in 3 bullet points', the candidate output is '• Revenue up 12% YoY • Net income $4.2B • Guidance raised for Q4', and the hard constraints are ['no speculation', 'cite only numbers from the report'].

## When to prefer this

Choose this endpoint when you need maximum confidence in an agent's output — especially before high-stakes actions like publishing, deploying, or filing. It is a four-pass adversarial process (vs. the sibling two-pass fast verify), making it slower but significantly more thorough. Prefer it when hard constraints must be enforced, when errors are costly, or when a single-pass review is insufficient for your risk tolerance.

## Known failure modes

- Missing required 'task' or 'candidate' fields returns a 400 error
- Overly long or malformed candidate text may be rejected or truncated
- If constraints are contradictory, the verification may flag all passes as failing without clear resolution
- Network timeouts on very large inputs given the multi-pass latency profile
- Payment failure via x402 protocol blocks the request before processing

## How this service works

Four-pass independent and adversarial verification for high-confidence agent QA.

## Output

A structured multi-pass verification report indicating whether the candidate output satisfies the original task, including adversarial critiques from each independent pass, identification of constraint violations, and an overall confidence or pass/fail determination.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "task": {
   "type": "string",
   "description": "Original task or requirement"
  },
  "candidate": {
   "type": "string",
   "description": "Candidate output to verify"
  },
  "constraints": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "description": "Optional hard constraints"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-alexweb-space-deep-verify-4163dfd6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent.alexweb.space](https://www.zero.xyz/host/agent.alexweb.space/llms.txt)