# Prospect Intelligence Batch Email Lookup

> Prospect Intelligence Batch Email Lookup is a paid API for AI agents from prospect-intelligence.prospectintel.workers.dev, paid per call via x402, $0.08/call, status unknown (last checked 2026-10-22).

Looks up email deliverability and source data for 1–25 contacts in a single call, returning results in input order with a summary count, billed only per unique address resolved.

## Facts

- Endpoint: POST https://prospect-intelligence.prospectintel.workers.dev/v1/email/batch?utm_source=zero.xyz
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prospect-intelligence-batch-email-lookup-3549fe51
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SNlgIVJ35x2tmJTKi-5oo

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 prospect-intelligence-batch-email-lookup-3549fe51 -d '<json body>'
```

Example prompt: Look up the email validity and deliverability status for these 5 contacts — Sarah Chen at acme.com, John Doe at stripe.com, and three others on my list — and tell me which ones are valid, accept-all, or unknown, and whether each address was found or inferred.

## When to prefer this

Use this endpoint when you need to validate or look up email data for multiple contacts (2–25) simultaneously and want to minimize round trips and cost. It deduplicates contacts automatically, so you're only billed for unique addresses resolved. Prefer the single /v1/email endpoint for one-off lookups. Use this batch endpoint when processing a prospect list, cleaning a CRM segment, or enriching leads in bulk prior to outreach.

## Known failure modes

- Invalid or malformed email address in input — result for that contact may be marked unknown
- More than 25 contacts submitted — request rejected with an error
- Insufficient USDC balance to cover maximum charge for unique contacts — payment fails
- Domain not recognized or no data available — status returned as unknown with no sources
- Duplicate contacts charged only once but listed in output for each occurrence

## How this service works

Batch email lookup: 1-25 contacts in one call, same result shape and labels as /v1/email, results in input order plus summary counts. x402 upto: you authorize up to $0.08 x unique contacts and are charged $0.08 only per address returned. Duplicates are looked up once. This request: 2 unique contact(s), maximum $0.16.

## Output

An array of per-contact results in the same order as the input, each containing the email address, deliverability status (valid, accept_all, or unknown), whether the address was found or inferred, and the sources it was discovered from. Also includes summary counts of how many contacts were resolved, valid, accept_all, unknown, and how many duplicates were deduplicated.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tool": "email_lookup_batch",
  "billing": {
   "charged_usd": 0.08,
   "max_authorized_usd": 0.16
  },
  "results": [
   {
    "email": "jane@acme.com",
    "index": 0,
    "outcome": "found",
    "recommendation": {
     "action": "send"
    }
   },
   {
    "email": null,
    "index": 1,
    "outcome": "no_result",
    "recommendation": {
     "action": "do_not_send"
    }
   }
  ],
  "summary": {
   "send": 1,
   "found": 1,
   "errors": 0,
   "unique": 2,
   "no_result": 1,
   "requested": 2,
   "do_not_send": 0,
   "verify_first": 0,
   "send_with_caution": 0
  },
  "schema_version": "2.0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/prospect-intelligence-batch-email-lookup-3549fe51/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prospect-intelligence.prospectintel.workers.dev](https://www.zero.xyz/host/prospect-intelligence.prospectintel.workers.dev/llms.txt)