Apian Labs Relay • SMS-first reliability
Apian Labs Relay delivers deterministic SMS reliability with explainable failover.
Apian Labs Relay improves SMS delivery reliability for transactional notifications and incident updates. Define deterministic routing (primary → secondary with retries + cooldown), then inspect a trace timeline and receipts for every message. Relay is not an SMS provider. It orchestrates routing and proof on top of your provider contracts. Provider and carrier fees are billed by your providers. Apian bills only the Relay fee.
Reliability proof
Every decision is logged for audit, debugging, and customer trust.
Bring your own providers
Connect Twilio and Telnyx. Relay routes across them and records proof artifacts while your provider fees stay with your providers.
Proof artifacts
Trace and receipt sample
{
"trace": { "messageId": "msg_447", "attempts": 2, "status": "delivered" },
"receipt": { "provider": "telnyx", "status": "delivered" }
}A single SMS API for transactional and incident notifications. Deterministic routing and receipts.
Define a routing policy once. Apian Labs Relay applies it consistently, records the outcome, and gives you an explainable trace timeline for every message (including failovers).
Deterministic failover
Primary → secondary routing with retries + cooldown windows.
Trace timeline
Receipts + attempts + normalized errors for every message.
BYO providers
Keep your Twilio/Telnyx contracts. Provider and carrier fees stay with your providers.
Built for incident moments
When providers are flaky, you need a policy that holds. Relay routes with deterministic ordering and leaves a clear trail when failover triggers.
Default behavior
Retryable failures (timeouts, 5xx, and rate limiting) trigger deterministic retry + failover per your policy. After failover, the primary provider enters a cooldown window (default 300s).
Not included at launch: voice fallback and OTP. The API is designed to add them later without breaking changes.
Proof artifacts
Trace exports you can hand to auditors
Relay produces exportable traces and receipts for every message so procurement and compliance teams can verify outcomes without digging through provider dashboards.
{
"messageId": "msg_447",
"status": "delivered",
"attempts": 2,
"receipt": { "provider": "telnyx", "status": "delivered" }
}Webhook signature headers
X-Relay-Signature: t=1735852800, v1=9a7c1f2f... X-Relay-Signature-Version: v1
Trust & security
Enterprise readiness, summarized
- SLA, DPA, and vulnerability disclosure policy in the Trust Center.
- Signed webhook events and immutable trace logs for audits.
- Live status + incident history for transparency.