nobounce.dev — email validation that suggests the fix instead of just saying no.

Live DNS checks are paid, from $1/mo. There is no free tier.

  Docs (agent-first, copy-pasteable):  https://nobounce.dev/llms.txt
  OpenAPI spec:                        https://nobounce.dev/openapi.json
  Verdict taxonomy + fixtures:         https://nobounce.dev/v1/config
  MCP (JSON-RPC 2.0):                  POST https://nobounce.dev/mcp

Try it with no account (frozen fixtures, no live DNS):
  curl -X POST https://nobounce.dev/demo/check -H 'Content-Type: application/json' -d '{"email":"user@gmai.com"}'

Keys are issued by redeeming an access code — email support@nobounce.dev to get one:
  curl -X POST https://nobounce.dev/v1/keys -H 'Content-Type: application/json' -d '{"coupon":"YOUR-CODE"}'