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# Connections Between Blockchain and APIs


- **Date:** Thursday, Jul 18, 2024
- **Time:** 10:30–12:30 (120 min)
- **Room:** Workshop room M5 (45)
- **Event:** World Congress 2024

## Description

Blockchains are isolated networks that do not communicate with each other natively. Another Blockchain challenge is the interaction with external systems and APIs that are off-chain.
But there are already solutions for communication between Blockchains in web3, known as cross-chain messages and also for interaction with web2 APIs using oracles.

In this live coding and hands-on session you will start from zero installing a web wallet, creating smart contracts in different blockchains and then experience both integrations: cross-chain communications between blockchains and interaction with external APIs using some Chainlink oracles and services.

## Speaker

### [Solange Gueiros](https://www.wearedevelopers.com/@solange-gueiros)

Developer Advocate at Chainlink Labs


## Related talks at this congress

- [Blockchain Unraveled](https://www.wearedevelopers.com/events/world-congress-2024/sessions/28-blockchain-unraveled) — Vasilika Klimova
- [If you know Python, you know blockchain: learn how to create a Python smart contract](https://www.wearedevelopers.com/events/world-congress-2024/sessions/110-if-you-know-python) — Camilo Molano Herrera, Evert Diaz
- [Exploring 5 Key Applications of AI Abundance with Blockchain Assurance](https://www.wearedevelopers.com/events/world-congress-2024/sessions/345-exploring-5-key) — Ed Marquez
- [How to Build for Decentralized Systems](https://www.wearedevelopers.com/events/world-congress-2024/sessions/121-how-to-build-for) — Alessandro Cappellato Ferrari