⚠️ DEPRECATED — Callr API v1 (JSON-RPC)

This SDK targets the legacy Callr JSON-RPC API (v1), which is deprecated and will be shut down on 30 June 2027. After that date this SDK will stop working.

➡️ Please migrate to the new Callr REST API v2.

• 📘 Migration guide (JSON-RPC → REST API v2): https://docs.callr.com/reference/migrating-from-json-rpc-v1
• 📣 What's new in REST API v2: https://docs.callr.com/changelog/rest-api-v2-is-here
• 🌐 REST API v2 base URL: https://api.callr.com/v2.0
• ✉️ Questions / migration help: support@callr.com

Your existing API credentials work with REST API v2 — no new keys required.

Official Callr REST API v2 SDKs are coming in the near future. In the meantime, you can call the REST API directly, or generate a client from the OpenAPI 3.1 spec (see Generate a REST API v2 client today below).

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Generate a REST API v2 client today

An official Callr REST API v2 SDK for .NET / C# is coming soon. Until then, generate a fully-typed client from the OpenAPI 3.1 spec with OpenAPI Generator (requires v7.x+ for OpenAPI 3.1):

docker run --rm -v "$PWD:/local" openapitools/openapi-generator-cli generate \
  -g csharp \
  -i https://api.callr.com/v2.0/openapi.json \
  -o /local/callr-v2-dotnet

Authenticate with your API Key via the x-api-key header (or HTTP Basic: Account SID + API Key). The base URL https://api.callr.com/v2.0 is baked into the generated client — see its generated docs/ for the available endpoints.

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sdk-dotnet

SDK for .NET in C# for CALLR API

https://www.callr.com/docs/