# Bulk SparkPost Email Hosting Checker

> Bulk SparkPost Email Hosting Checker is a paid API for AI agents from email.intel.rallylive.ca, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-18).

Checks up to 20 domains in one concurrent batch to determine whether each domain's email is hosted by SparkPost, returning results in input order with per-item error fields and a failure count.

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/bulk/email/hosted-by/sparkpost?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bulk-sparkpost-email-hosting-checker-a98f21e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_odXFO_GVS8OB_Upv-tjBy

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 bulk-sparkpost-email-hosting-checker-a98f21e0
```

Example prompt: Can you check all 20 domains on my list at once and tell me which ones have their email hosted by SparkPost, including any that errored out?

## When to prefer this

Use this endpoint when you have a list of 2–20 domains and need to check SparkPost hosting for all of them efficiently in a single call rather than making separate single-domain requests. It is more cost-effective and faster than looping over the single-domain endpoint, and returns results in the same order as input with granular per-item error reporting, making it ideal for pipeline enrichment or audit workflows.

## Known failure modes

- More than 20 domains submitted — batch size limit exceeded
- DNS lookup failure for one or more domains — per-item error field populated
- Invalid domain format — per-item error returned
- Network timeout on concurrent MX resolution — failure count incremented
- Payment not completed (x402) — entire batch rejected before processing

## How this service works

Bulk is email hosted by sparkpost: up to 20 domains in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agents that hold a list. $0.10 per batch.

## Output

An ordered list of results matching the input domain order, where each item contains a boolean indicating whether the domain's email is hosted by SparkPost, a per-item error field if the lookup failed, and an overall failure count for 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/bulk-sparkpost-email-hosting-checker-a98f21e0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email.intel.rallylive.ca](https://www.zero.xyz/host/email.intel.rallylive.ca/llms.txt)