# Old Colony Web Email Batch Preflight (11–50 Addresses)

> Old Colony Web Email Batch Preflight (11–50 Addresses) is a paid API for AI agents from api.oldcolonyweb.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-30).

Validates a batch of 11–50 email addresses for syntax correctness, DNS resolution, MX record presence, and disposable-domain detection for $0.005 per batch.

## Facts

- Endpoint: POST https://api.oldcolonyweb.com/v1/email/batch/50?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/old-colony-web-email-batch-preflight-11-50-addresses-1145abd8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2dQDovTLGrfp13lGI5Gwd

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 old-colony-web-email-batch-preflight-11-50-addresses-1145abd8 -d '<json body>'
```

Example prompt: Can you preflight these 25 email addresses and tell me which ones have syntax errors, missing MX records, or are from disposable email providers before I add them to our mailing list?

## When to prefer this

Choose this endpoint when you need to validate a mid-size batch of 11–50 email addresses in a single call at low cost ($0.005). It is more efficient than the 2–10 address tier for medium lists and covers syntax, DNS, MX, and disposable-domain checks in one pass. Prefer this over single-address validation when processing form signups, CRM imports, or outreach lists in the 11–50 range. Not suitable for mailbox-level ping verification or consent checking.

## Known failure modes

- Fewer than 11 or more than 50 emails submitted — request rejected with validation error
- Malformed email strings exceeding 320 characters — item flagged or batch rejected
- DNS lookup timeouts causing unknown status for some addresses
- Disposable-domain list may not cover all providers, leading to false negatives
- Network or service errors returning non-200 responses
- Payment failure via x402 protocol preventing request from being processed

## How this service works

Email preflight 11–50 addresses for $0.005 per batch. Ordered syntax/DNS/MX/disposable evidence and explicit unknowns. Addresses processed, not intentionally logged in routine telemetry. No mailbox, deliverability or consent guarantee. Bazaar response example shows the first result only; actual response includes all items.

## Output

An ordered array of preflight results for each submitted email address, including syntax validity, DNS resolution status, MX record presence, disposable-domain classification, and any explicit unknown indicators. Results appear in the same order as the input list. No mailbox-level ping or deliverability guarantee is provided.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "emails": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 320,
    "minLength": 1
   },
   "maxItems": 50,
   "minItems": 11
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/old-colony-web-email-batch-preflight-11-50-addresses-1145abd8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.oldcolonyweb.com](https://www.zero.xyz/host/api.oldcolonyweb.com/llms.txt)