REST API - iso8583sim

The REST API exposes parsing, building, validation, explanation, generation and version conversion over HTTP. The playground on each endpoint page sends requests to the public demo at https://api.iso8583sim.com, so you can try it without installing anything. The demo has LLM features turned off and is rate limited. Only send test card numbers. To use LLM features, or to run it against your own systems, start it locally and switch the playground’s server to http://127.0.0.1:8000:

pip install "iso8583sim[web]"
iso8583sim web          # http://127.0.0.1:8000, interactive docs at /docs

The API has no authentication. It listens on 127.0.0.1 by default. Don’t expose it on a public network unless you run it in public mode.

See REST API guide for running it in Docker, error codes and examples.