API playground

Use this tool to quickly generate a correct request shape, copy a cURL, and sanity-check the headers you should be sending. The response is simulated, but the request format matches the docs.

When to use this

• You are wiring up your first POST /v1/transmissions call.
• You are not sure which scope a key needs.
• You want a reference cURL to compare against your SDK or HTTP client.

What to look for

• Authorization: Authorization: Bearer ... should be set server-side only.
• Idempotency: for create actions, set Idempotency-Key so retries do not duplicate work.
• Content-Type: application/json for JSON bodies.

Relevant docs:

• Authentication
• Idempotency
• Errors

curl -sS -X POST https://api.sendlib.com/v1/transmissions \
+  -H "Authorization: Bearer $SENDLIB_API_KEY" \
+  -H "Accept: application/json" \
  -H "Idempotency-Key: 0d6c2a6f-3f3c-4d4a-9c1a-2f7f9c1a1f0b" \
  -H "Content-Type: application/json" \
  -d '{
  "from": "billing@yourdomain.com",
  "to": [
    "user@example.com"
  ],
  "subject": "Receipt #1042",
  "html": "<p>Thanks - your receipt is attached.</p>",
  "meta": {
    "tenant": "acme",
    "tags": [
      "receipt"
    ]
  }
}'

{
  "id": "tx_01HP3GZK4B8X2W1P0R9N7M6L5K",
  "status": "accepted"
}