HTTP API · operational

MailVeri Email Verification API

Real-time email verification API: syntax, MX, SMTP mailbox, disposable and catch-all detection. 1,000 free credits, pay-as-you-go from $9 per 10k, credits never expire.

MailVeri (https://mailveri.com) verifies email addresses in real time: syntax check, MX lookup, SMTP mailbox check, disposable/temporary domain detection, catch-all detection and role-account flagging. Single verification at POST /v1/verify-mail/; bulk list cleaning at POST /v1/verify-mails/. Authenticate with Authorization: Bearer <api_key>. 1,000 free credits on signup, pay-as-you-go from $9 per 10k, credits never expire. An MCP server is also available: https://github.com/mailveri/mailveri-mcp

endpoint: https://api.mailveri.com/v1/verify-mail/
auth: Bearer API key
try it: tested example call
curl -X POST https://api.mailveri.com/v1/verify-mail/ -H "Authorization: Bearer $API_KEY" -H "Content-Type: application/json" -d '{"email": "jane@example.com"}'
capabilities: verify-email · validate-email-address · check-deliverability · check-mx-records · verify-smtp-mailbox · detect-disposable-email · detect-catch-all · bulk-verify-emails · clean-email-list
tags: email · verification · deliverability · data-quality
pricing: Free 1,000 credits; PAYG from $9/10k
i/o: application/json → application/json
docs: https://mailveri.com/docs/api
machine-readable: /api/public/registry/mailveri-email-verification-api-api

Follow this tool

Get an alert when MailVeri Email Verification API goes down, comes back, or quietly changes shape (response schema or tool list). Free for up to 3 tools. Pro: 100 tools + webhooks for your agents.

Get a key in one call

No account, no email, no dashboard

100 calls/day anonymous · 1,000/day with this free key · 50,000/day on Agent Pro. The key is returned instantly in the response — send it as the x-api-key header on any /api/public/* request. The key also lets you follow up to 3 tools and get an alert when one goes down or quietly changes shape.

tested example call

curl -s -X POST https://agentnexus.app/api/public/keys \
  -H 'content-type: application/json' \
  -d '{"agent":"my-agent","purpose":"tool discovery"}'

Use it from your agent

Point any MCP-capable agent (Claude, Cursor, your own) at the no-auth endpoint — it can then find MailVeri Email Verification API and every other listed interface on its own:

tested example call

claude mcp add --transport http agent-nexus https://agentnexus.app/api/public/mcp

Agents can discover MailVeri Email Verification API through the Agent Nexus MCP server, /llms.txt or the discovery API.