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411data.io Reverse Phone Lookup
x402
411data.io Reverse Phone Lookup is a paid API for AI agents from 411data.io, paid per call via x402, $0.33/call, status unknown (last checked 2026-09-13).
Given a phone number, returns the associated person's name, email addresses, and physical addresses — billed only on a match.
Price / call$0.33
Success—
StatusUnknown
How this service works
Reverse phone lookup (bill-on-match). Returns person name, emails, and addresses tied to the number.
Output
Returns the matched person's full name, one or more associated email addresses, and one or more physical/mailing addresses linked to the phone number. Response is billed at $0.33 USDC only when a match is found (bill-on-match model).
Example use cases
Identify unknown caller
“Someone called me from 312-867-5309 and left no voicemail — can you look up who that number belongs to and give me their name and address?”
Sales lead contact enrichment
“I have a lead's phone number, 646-555-0147 — can you enrich it to get their full name, email, and mailing address so I can add them to my CRM?”
Verify contact info before outreach
“Before I reach out, can you reverse-lookup the phone number 408-555-0233 to confirm the name and email we have on file actually match what's tied to that number?”
Technical details
Endpoint
POSThttps://411data.io/api/v1/enrich/phoneWhen to prefer
Use this endpoint when you have a phone number and need to identify the person behind it — their name, email, or address — without paying unless a match is returned. Preferred over person-search endpoints when the phone number is your primary identifier. Best for lead enrichment, unknown-caller identification, or contact verification workflows where cost efficiency (bill-on-match) matters.
Side effects
- No match found for the number — no charge applied but empty result returned
- Invalid or malformed phone number format — request rejected with validation error
- Number is unlistable (VOIP, burner, or newly issued) — low or no match rate
- Rate limiting or quota exceeded — 429 error
- Service unavailable — 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| phone | string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"people": [
{
"name": "James W Cole Sr",
"wp_id": "PX3vrMbpE3k",
"emails": [],
"phones": [
{
"type": "unknown",
"label": "unknown",
"score": 71,
"number": "(724) 206-0094",
"source": "https://411data.io/person-hunt",
"sources": [
{
"url": "https://411data.io/person-hunt",
"label": "person hunt",
"wp_id": "PX3vrMbpE3k",
"vendor": "whitepages"
}
]
}
],
"source": "https://411data.io/person-hunt",
"aliases": [
"James Cole Jr",
"Jim W Cole"
],
"addresses": [],
"job_title": null,
"relatives": [],
"company_name": null,
"linkedin_url": null
}
],
"metadata": {
"page": 1,
"page_size": 5,
"query_mode": "reverse_phone",
"result_count": 5
}
},
"input": {
"phone": "+17242060094"
},
"billed": true,
"vendor": "whitepages",
"matched": true,
"endpoint": "enrich/phone",
"cache_hit": false
}
}Tags
x402
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