API referenceLetters

Get a batch with its live per-status rollup

Returns the letter_batch with a live rollup of its member letters: statusCounts maps each letter status to a count, and completed counts letters in a terminal state (delivered, undeliverable, canceled, or failed).

Endpoint
GET https://api.dairo.app/v1/letters/batches/{id}

Returns the letter_batch with a live rollup of its member letters: statusCounts maps each letter status to a count, and completed counts letters in a terminal state (delivered, undeliverable, canceled, or failed). The batch is finished when completed equals total. List the individual letters with GET /v1/letters?batchId=...; responds 404 when the batch id is unknown. Requires the letters:read scope.

Scope: letters:read. Send the API key as a bearer token; Scopes lists what each one reaches.

Request

cURL
curl "https://api.dairo.app/v1/letters/batches/3fa85f64-5717-4562-b3fc-2c963f66afa6" \
  -H "Authorization: Bearer $DAIRO_API_KEY"

Path parameters

NameTypeRequiredDescription
idstringyesThe letter batch's ID.

Response

200 Success. Body: application/json, LetterBatch.

FieldTypeRequiredDescription
object"letter_batch"yes
idstringyes
templateIdstring or nullno
statusstringyes
totalintegeryes
completedintegernoMember letters in a terminal state (delivered, undeliverable, canceled, failed).
statusCountsmap of integernoLive count of member letters keyed by their letter status.
createdAtstring (date-time) or nullno
updatedAtstring (date-time) or nullno
200
{
  "object": "letter_batch",
  "id": "string",
  "templateId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "status": "string",
  "total": 0,
  "completed": 0,
  "statusCounts": {},
  "createdAt": "2026-10-19T09:30:00Z",
  "updatedAt": "2026-10-19T09:30:00Z"
}

Errors

Every error has the same body, {"error": {"type", "code", "message", "param"}}; branch on code. Errors lists every code.

StatusMeaning
400The request is malformed or a value is invalid (invalid_request, invalid_domain, idempotency_key_mismatch).
401The API key is missing or invalid.
403The key lacks the scope this endpoint needs (scope_missing) or may not do this (not_permitted).
404No such resource in this account (resource_not_found).
422The request is well-formed but a field failed validation (validation_failed).
429Rate limit, plan limit, budget or spend cap reached (rate_limited, plan_limit_reached, budget_exceeded, spend_cap_reached).
500An unexpected error; retry with backoff, then contact support (internal_error).

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