Contact Verification

Verify a contact's email, phone number, and address in parallel. Returns validation status for each channel. Essential for CRM hygiene and lead qualification.

3 steps x402 eligible contact-verify

What it runs

Email Validation
Source: Algorithmic (syntax) + DNS protocol (MX record verification)
Phone Validation
Source: libphonenumber-js (Google libphonenumber port)
Address Validation
Source: OpenStreetMap Nominatim

The answer returns every step’s result, so your agent can show or check each one.

Inputs

Field	Type	Required	What it is
`email`	string	Yes	Email address to verify
`address`	string	No	Postal address to verify (optional)
`phone_number`	string	No	Phone number to verify (optional)

How to call it

# Needs an API key. The whole check is charged once, at the listed price.
curl -X POST https://api.strale.io/v1/solutions/contact-verify/execute \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "inputs": {
      "email": "[email protected]",
      "address": "10 Downing Street, London, UK",
      "phone_number": "+447911123456"
    },
    "max_price_cents": 25
  }'

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i -X POST https://api.strale.io/x402/v2/solutions/contact-verify \
  -H 'Content-Type: application/json' \
  -d '{
    "email": "[email protected]",
    "address": "10 Downing Street, London, UK",
    "phone_number": "+447911123456"
  }'

The bundle’s published example input.

Limitations

Disposable email detection covers major providers but new throwaway domains may not be flagged
From step: Email Validation
What to do instead: Check the domain’s age when investigating suspicious traffic.
No mailbox is contacted. A made-up or bouncing address can return valid if its syntax is correct, its domain has mail servers, and it is not flagged as disposable. Catch-all domains are one example; mailbox existence and delivery are never checked.
From step: Email Validation
What to do instead: Require confirmation through a verification link before relying on a mailbox.
Valid means the number fits the country's numbering plan. It does not show that the number is assigned or in service.
From step: Phone Validation
Carrier/operator name detection requires a paid service — returns null
From step: Phone Validation
Numbers without international prefix need a country_code hint for accurate parsing
From step: Phone Validation
Nominatim rate limit of 1 request per second — shared across address-validate and address-geocode
From step: Address Validation
Nominatim uses best-match geocoding — results may not always reflect the exact address
From step: Address Validation