Add UniRate integration

[rob-browncc]

Adds the UniRate currency-exchange integration to the Haystack integrations index.

haystack-unirate provides three Haystack 2.x @component building blocks for working with live currency data in pipelines:

• UniRateExchangeRate — latest exchange rate for a currency pair (or all targets for a base).
• UniRateConverter — convert a monetary amount between two currencies.
• UniRateCurrencies — list every supported currency code.

Each component supports to_dict / from_dict serialization and uses Haystack Secret for API-key handling. Free-tier endpoints (rates, conversion, currency listings) work out of the box; historical data is Pro-gated.

• PyPI: https://pypi.org/project/haystack-unirate/
• Repo: https://github.com/UniRate-API/haystack-unirate
• Published with OIDC + attestations · MIT · Python 3.10–3.13 · Haystack 2.0

This PR adds integrations/unirate.md (front-matter + docs) and logos/unirate.png.

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[kacperlukawski]

Thank you, @rob-browncc Could you please help me understand if the integration comes from an actual need of any user? I would like to know if that's going to be helpful for a broader audience.

[rob-browncc]

Thanks for taking a look, @kacperlukawski — fair question.

Honestly, I built this to fill a gap rather than in response to a specific user ticket: Haystack doesn't currently have a component for live currency/exchange-rate data. The use case is pipelines and agents that need up-to-date FX — e.g. a finance/e-commerce RAG assistant answering "what's this price in EUR today?", or an agent tool that converts amounts and pulls VAT rates as part of a larger workflow. It's three small @components (exchange rate, convert, list currencies) over a thin client, so it slots into a pipeline the same way other data-fetching components do.

I don't want to overstate demand — I can't point you to a pile of users asking for it specifically. If a standalone FX integration feels too niche for the directory, I'm happy to adjust the framing/scope, or you're equally welcome to pass on it. No hard feelings either way — just thought it might be a useful building block for the finance-adjacent folks in the community.