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Get seed tests for a sending domain

GET
/v1/email/inbox-insights/seed-tests
// Requires Insights preview access for the organization.
let sendingDomain: string | undefined;
for await (const domain of bird.email.inboxInsights.domains.list({ search: "mail.example.com" })) {
  if (domain.domain === "mail.example.com") { sendingDomain = domain.domain; break; }
}
if (!sendingDomain) throw new Error("Verify mail.example.com in this workspace first");
const report = await bird.email.inboxInsights.seedTests.list({ sending_domain: sendingDomain });
console.log(report);
Response200
{
  "resource": "placement",
  "domain": "mail.acme.com",
  "measurement": {
    "sources": [
      "panel",
      "intelliseed_public"
    ],
    "weighting": {
      "weight_set_id": "12",
      "source": "account",
      "basis": "weighted-mean-of-per-isp-rates"
    }
  },
  "generated_at": "2026-08-18T09:34:00Z",
  "freshness": {
    "as_of": "2026-08-17",
    "lag_hint": "daily"
  },
  "cached_at": "2026-08-18T09:40:02Z",
  "window": {
    "start": "2026-08-12",
    "end": "2026-08-18",
    "group_by": "day"
  },
  "compared_to": {
    "start": "2026-06-19",
    "end": "2026-07-18"
  },
  "tests": {
    "items": [
      {
        "test_id": "91901",
        "subject": "Fall Preview, first look",
        "tested_at": "2026-08-13T09:12:00Z",
        "list_type": "private",
        "engagement_profile": "all",
        "seed_count": 212,
        "inbox_rate_percent": 89.2,
        "domain": "mail.acme.com",
        "regions": [
          "North America - US",
          "Europe - UK"
        ],
        "delta_pts_vs_prior": -3.1
      }
    ],
    "truncated": false,
    "status": "ok"
  },
  "latest": {
    "test_id": "91901",
    "subject": "Fall Preview, first look",
    "tested_at": "2026-08-13T09:12:00Z",
    "list_type": "private",
    "engagement_profile": "all",
    "seed_count": 212,
    "inbox_rate_percent": 89.2,
    "providers": {
      "items": [
        {
          "mailbox_provider": "gmail",
          "inbox_rate_percent": 95,
          "spam_rate_percent": 5,
          "inbox_seeds": 61,
          "spam_seeds": 3,
          "total_seeds": 64,
          "gmail_category": {
            "category": "promotions",
            "share_percent": 61
          }
        }
      ],
      "status": "ok"
    },
    "auth": {
      "spf_pass_rate_percent": 100,
      "dkim_pass_rate_percent": 100,
      "dmarc_aligned_rate_percent": 100,
      "status": "ok"
    },
    "engagement_split": {
      "items": [
        {
          "mailbox_provider": "gmail",
          "engaged_inbox_rate_percent": 96,
          "dormant_inbox_rate_percent": 71,
          "gap_pts": 25,
          "engaged_seeds": 32,
          "dormant_seeds": 32
        }
      ],
      "status": "ok"
    }
  },
  "quota": {
    "used": 112,
    "limit": 300,
    "resets_at": "2026-09-01T00:00:00Z"
  }
}

Returns the seed tests run for a sending domain over the period, newest first, together with the newest test's full results and the organization's seed-test allowance for the current billing period.

A seed test sends to a panel of real mailboxes across many providers and reports exactly where each copy landed, so unlike the placement estimates it is a direct measurement of one send. Seed counts are small by nature, so a single seed moves a rate noticeably.

The list is capped at 100 tests rather than paged: tests.truncated says whether the period holds more than that, and an earlier period reaches the ones left out. A test counts against the billing-period allowance when it is registered, whether or not its send goes out.

Scoped API keys, OAuth and service accounts require organization preview access.

Query Parameters

sending_domainstring

The sending domain to report on: one of the workspace's verified sending domains, exactly as it appears there. A domain that is not verified in this workspace answers not-found.

fromstring

First UTC day of the period, inclusive, in YYYY-MM-DD: the same window convention as the email statistics endpoints. Defaults to 90 days before to, which is the span the history view shows.

It may be at most 90 days before to, which is also the default, so a request naming neither date is already at the limit. Asking for more answers 422. To reach older tests, request an earlier period.

tostring

Last UTC day of the period, inclusive, in YYYY-MM-DD. Defaults to today.

Response Payload

resource
string
required

Which resource this response is, echoed for self-description.

domain
string
required

The sending domain the figures describe.

measurement
object

How the figures were measured. Present only where a figure was weighted or drawn from a named set of sources, which today means placement and the industry benchmark. Absent on the reputation resources and on a live lookup, neither of which weights anything.

Show child attributes
generated_at
string
required

When these figures were computed. The measurement service's own stamp where it publishes one; on the resources Bird derives from daily rates it has none to publish, and this is when Bird computed them.

freshness
object
required

How current the figures are. Freshness differs per resource (authentication data can lag a day or more while blocklist lookups are near real time), so any "as of" label binds from this field, never from a fixed string.

Show child attributes
cached_at
string

Present when the response was served from a short-lived copy rather than fetched for this request: when that copy was fetched.

window
object
required

The period every figure in the response covers: whole UTC calendar days, inclusive on both ends. The same window convention the email statistics endpoints use, so figures from the two sources describe the same days and can be combined without adjustment.

Show child attributes
compared_to
object

The prior equal-length period the delta figures compare against. Present only when the request asked for a comparison.

Show child attributes
tests
object
required

The domain's seed tests over the period, newest first, up to 100 of them. The list is capped rather than paged, so truncated says whether older tests in the period were left out.

Show child attributes
latest
object

The newest test in the period with its full results, so the summary panels need no second request. Absent when the period holds no tests.

Show child attributes
latest.test_id
string
required

The test's identifier. It is a string and needs to stay one: the values are long enough that any language storing every number as a floating point value will round them, and a rounded identifier matches no test.

latest.subject
nullable string
required

Subject line of the tested send, or null before the send goes out. With tested_at, this is what distinguishes a test that has run from one still waiting for its send.

latest.tested_at
nullable string
required

When the tested send went out, or null while the test is still awaiting it.

latest.list_type
nullable string
required

The seed pool the test used, or null on a test that predates the recording of it.

latest.engagement_profile
nullable string
required

The engagement behaviour the seeds simulated, or null on a test that predates the recording of it.

latest.seed_count
nullable integer
required

How many seed addresses the test used.

latest.inbox_rate_percent
nullable number
required

Share of the test's seed addresses that received the message in the inbox, as a percentage. Null until results arrive.

latest.providers
object
required

The per-provider grid for one seed test.

Show child attributes
latest.providers.items
array of object
required

One row per mailbox provider the test placed seeds at.

Show child attributes
latest.providers.status
string
required

Whether a section of the response carries figures, and when it does not, why.

ok means the section is populated. no_data means the measurement ran and observed nothing to report for this domain in the period. not_configured means the section needs a setup step that has not been completed yet, such as connecting Google Postmaster Tools; treat it as an invitation to finish setup rather than a fault. unavailable means the figures could not be retrieved this time and the same request may well succeed on a retry; the rest of the response is unaffected. not_applicable means the section is meaningless for this domain in this period, so there is nothing to show or fix.

A successful response never implies every section is populated; read each section's status rather than assuming figures are present.

Possible values: ok, no_data, not_configured, unavailable, not_applicable

latest.auth
object
required

How the tested send authenticated, measured on the seed mail itself rather than on reporting from receivers.

Show child attributes
latest.engagement_split
object
required

Engaged against dormant placement, per provider. The status is not_applicable for a test run with a single-cohort engagement profile, where there is no second group to compare: hide the comparison rather than showing a zero gap.

Show child attributes
quota
object
required

The organization's seed-test allowance for the current billing period. Registering a test spends one of the allowance whether or not its send goes out, and a test that expires unused does not return it. Uncertain registrations can retain allowance.

Show child attributes

Continue with the documentation, guides and examples for this topic.