# SIP Stateful-Proxy Fork Response Aggregation Verifier

> SIP Stateful-Proxy Fork Response Aggregation Verifier is a paid API for AI agents from detect.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-11-04).

Validates SIP stateful-proxy fork response-aggregation logic including final response selection, delayed 6xx vs winning 2xx races, CANCEL directives, and anonymous challenge aggregation across branches

## Facts

- Endpoint: POST https://detect.halowerk.com/v1/F-A-NIGHT-PROTOCOL-SIP-FORK/sip-stateful-proxy-fork-response-aggregation?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-04
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sip-stateful-proxy-fork-response-aggregation-verifier-39a6c1bb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rLBvK0eXrWoM2pInuS_j4

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 sip-stateful-proxy-fork-response-aggregation-verifier-39a6c1bb -d '<json body>'
```

Example prompt: Validate my SIP stateful-proxy fork scenario: I have an INVITE call, upstream TLS enabled, one branch with downstream TLS, a claim of 42, and a sequence of fork events where I need to check whether the final response selection correctly handles a delayed 6xx losing to a winning 2xx, with no future 503s.

## When to prefer this

Use this endpoint when you need to programmatically verify SIP stateful-proxy fork response-aggregation correctness — particularly for offline fixture testing, RFC 3261 compliance checks, or automated regression of fork race conditions (delayed 6xx vs 2xx, branch CANCEL, anonymous challenge aggregation) without requiring a live SIP stack.

## Known failure modes

- Invalid event sequence structure — events array malformed or exceeds 512 items
- Claim value out of allowed numeric range
- Mismatched branch count between branch_downstream_tls array and events
- Missing required fields in sip_fork object
- Contradictory flag combinations (e.g. all_future_requests_503 with active branches)

## How this service works

An offline SIP stateful-proxy fixture author needs response-context final selection, delayed6xx versus winning2xx races, current-branch CANCEL directives and unchanged anonymous challenge aggregation, including late stateless forwarding.

## Output

Returns a validation result indicating whether the claimed SIP fork response-aggregation outcome is correct, covering final response selection logic, delayed 6xx versus winning 2xx race results, CANCEL branch directives, anonymous challenge aggregation, and late stateless forwarding behavior

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "artifact": {
   "type": "object",
   "required": [
    "sip_fork"
   ],
   "properties": {
    "sip_fork": {
     "type": "object",
     "required": [
      "all_future_requests_503",
      "branch_downstream_tls",
      "claim",
      "events",
      "invite",
      "upstream_tls"
     ],
     "properties": {
      "claim": {
       "type": "number",
       "maximum": 1000000000000,
       "minimum": -1000000000000
      },
      "events": {
       "type": "array",
       "items": {
        "type": "array",
        "items": {
         "anyOf": [
          {
           "type": "array",
           "items": {
            "type": "array",
            "items": {
             "type": "number",
             "maximum": 1000000000000,
             "minimum": -1000000000000
            },
            "maxItems": 512
           },
           "maxItems": 512
          },
          {
           "type": "boolean"
          },
          {
           "type": "number",
           "maximum": 1000000000000,
           "minimum": -1000000000000
          }
         ]
        },
        "maxItems": 512
       },
       "maxItems": 512
      },
      "invite": {
       "type": "boolean"
      },
      "upstream_tls": {
       "type": "boolean"
      },
      "branch_downstream_tls": {
       "type": "array",
       "items": {
        "type": "boolean"
       },
       "maxItems": 512
      },
      "all_future_requests_503": {
       "type": "boolean"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sip-stateful-proxy-fork-response-aggregation-verifier-39a6c1bb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from detect.halowerk.com](https://www.zero.xyz/host/detect.halowerk.com/llms.txt)