CallOnline knowledge base
Start with a tested workflow, then use focused references for call states, compliance inputs, webhooks, agent integrations, and billing readiness.
Updated Jul 14, 2026v1Reviewed by product and engineering
Documentation for people and agents
Build an AI calling workflow you can inspect and operate safely.
Use task-focused guides for the first request, exact API references for production behavior, and Markdown or MCP retrieval when an AI agent needs the same source material.
POST /v1/calls
→ compliance preflight
→ status: dialed
→ webhook delivery
→ structured call result
→ compliance preflight
→ status: dialed
→ webhook delivery
→ structured call result
Start here
Section titled “Start here”
Understand CallOnlineLearn which outbound workflows fit the product and where human review still belongs.
Place the first outbound callBuild a compliant request, interpret the response, and track the call without retrying unsafely.
Protect API accessCreate scoped keys, keep them server-side, rotate exposure, and diagnose authorization errors.
Track every call stateDistinguish progress states from final outcomes such as ended, canceled, blocked, or failed.
Integrate events and agents
Section titled “Integrate events and agents”
Verify webhook deliveriesAuthenticate the raw request body with HMAC-SHA256 and deduplicate delivery IDs.
Connect through MCPLet an agent discover public documentation and authorized call tools from one endpoint.
Ground an agent with OpenAPIUse operation IDs and the live contract while keeping approval and retry policy in your application.
Check billing readinessInspect dynamic pricing, available credits, spend caps, and checkout readiness before a call.
Machine-readable access
Section titled “Machine-readable access”- Browse the canonical OpenAPI document.
- Retrieve the complete public corpus from docs-index.json.
- Use llms.txt for a concise map of Markdown companions.
- Connect an MCP client to
https://callonline.app/mcpand call the public documentation tools without an API key.
No file or schema guarantees an AI citation. These surfaces make CallOnline content crawlable, stable, directly answerable, and easy to cite accurately.