API reference

The Nexio API is JSON over HTTPS, called from your servers.

https://api.usenexio.com

Every public route except GET /health and GET /robots.txt is under /api/v1/ and needs Authorization: Bearer <key>. The only routes without a key are GET /health, GET /robots.txt and the inbound event route, which is authenticated per source (a signature, or a shared code for an ams360_ons source).

Topic	Page
Which key a route accepts, and capabilities	Authentication and access
Sandbox and live	Environments
Headers, status codes, retries, idempotency	Requests and errors
Every error code	Error reference
Rate limits, body size, request bounds, run cap	Limits and rate limits
API, webhook and engine versions	Versioning
The machine-readable interface definition (OpenAPI 3.1)	Download `openapi.yaml`
Primitives, and what you configure versus what Nexio ships	Platform model
Collections served by Records	Records overview
Source tables on a connection	Source tables

Each endpoint page lists the request fields, the response fields and the errors, with the capability a scoped key needs. The /engines/{slug}/runs/latest routes are bound to platform engines and are not documented here. Error bodies have one shape:

{
  "code": "insufficient_capability",
  "message": "API key does not have permission for this action"
}

Match on code. message is for people and can change.

Last modified on October 7, 2026

Overview

Engines

Environments

Conversations

Webhooks

Events

Records

Connections

Graph

Platform

API reference