# HTTP/3 Support Bulk Checker

> HTTP/3 Support Bulk Checker is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Checks HTTP/3 and modern transport protocol support for up to 20 domains in a single concurrent batch call, returning per-domain results in input order with failure counts.

## Facts

- Endpoint: GET https://intel.rallylive.ca/bulk/monitor/http3
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/http-3-support-bulk-checker-5557bc61
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zpG_0g8qqU3x5NF4FDDxS

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 http-3-support-bulk-checker-5557bc61
```

Example prompt: Check if these 5 domains support HTTP/3 all at once: example.com, shopify.com, cloudflare.com, github.com, and stripe.com — give me a clear yes/no for each with any errors noted.

## When to prefer this

Use this endpoint when you have a list of 2–20 domains and need HTTP/3 support checked efficiently in parallel rather than making sequential single-domain calls. Ideal for batch audits, competitor analyses, or pre-launch infrastructure checks where throughput and ordered results matter. Prefer the single /monitor/http3 endpoint only when checking a single domain.

## Known failure modes

- Domain unreachable or DNS resolution failure results in per-item error field set
- Invalid domain format causes per-item error
- More than 20 domains provided may be rejected or truncated
- Network timeout per domain included as per-item error
- All domains unreachable results in high failure count

## How this service works

Bulk http3 support: up to 20 domains in one call, processed concurrently, results returned in input order with a per-item error field and a count of failures. Same answer per item as the single /monitor/http3 endpoint (HTTP/3 and modern-transport support). Batch enrichment for agents that hold a list. $0.01 per batch.

## Output

An ordered array of per-domain results matching the input list, each indicating whether the domain supports HTTP/3 and modern transport protocols, along with a per-item error field if detection failed, and a summary count of total failures across the batch.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/http-3-support-bulk-checker-5557bc61/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)