The Continuum API, all resources.

const r = await client.verify.single(email);
if (r.score >= 70 && r.result === 'deliverable') {
  await client.send.send({
    to: email,
    subject: 'Welcome',
    html_body: '<p>You're in.</p>',
  });
}

// Submit CSV, poll until done
const job = await client.bulk.submit(csvFile);
let result;
do {
  await new Promise(r => setTimeout(r, 5000));
  result = await client.bulk.get(job.id);
} while (result.status !== 'complete');
// result.download_url — filtered by status

const seq = await client.sequences.create({
  mailbox_id: 'mbx_...',
  stop_on_reply: true,
});
await client.sequences.addStep(seq.id, {
  delay_days: 0, html_body: '<p>Hi {{first_name}}</p>',
});
await client.sequences.enroll(seq.id, {
  emails: ['ceo@acme.com'],
});

const { runId } = await fetch(BASE + '/v1/finder/search', {
  method: 'POST', headers,
  body: JSON.stringify({
    personTitleIncludes: ['Head of Growth'],
    personLocationCountryIncludes: ['United States'],
  }),
}).then(r => r.json());
// poll GET /v1/finder/jobs/:runId/status until phase is "verified"
const { results } = await fetch(`${BASE}/v1/finder/jobs/${runId}/results`, { headers }).then(r => r.json());
await fetch(`${BASE}/v1/finder/jobs/${runId}/import`, {
  method: 'POST', headers,
  body: JSON.stringify({ emails: results.map(r => r.email), sequenceId: seq.id }),
});

const list = await client.lists.create({ name: 'Waitlist' });
await client.lists.subscribe(list.id, { email, firstName });

const campaign = await client.campaigns.create({
  subject: 'We launched 🎉',
  html_body: '<p>Hello {{first_name}}</p>',
  list_ids: [list.id],
});
await client.campaigns.send(campaign.id);