The REST API.

What you get

• Resources

  Messages and their events, templates and versions, tenants, connections, senders and grants, webhooks and deliveries, usage, stats and contact erasure.

• Idempotency

  Send an Idempotency-Key header. The same key and body return the original result for 24 hours; a different body returns idempotency_conflict.

• Cursor pagination

  Lists take limit, up to 100, and starting_after, and return has_more.

• Problem details

  Errors follow RFC 9457 with a stable code and a request_id.

• Scoped keys

  Keys carry permissions such as messages.send, read, templates.manage, developer.manage and connections.manage, and can be limited to tenants. Recipient numbers stay masked without pii.read.

• Rate limits

  Limits per key return 429 with Retry-After.

• Batch API and API explorer

  At launch

  Batch sends with per-item results, and an in-browser explorer that runs against Sandbox.

• CLI and MCP

  Release 2

  Administer Hopwire from the command line and AI assistants.

Questions

Related

• SDKAvailableA typed server-side SDK for Node with automatic idempotency keys, careful retries, typed errors and a webhook verifier.
• Error codesAvailableStable request error codes and delivery outcome codes, each with a cause, a fix, and whether it retries or falls back.
• Developer overviewAvailableHow Hopwire fits into your backend: a REST API, a TypeScript SDK, signed webhooks and a sandbox with fixed failure scenarios.