# Trustless Insurance Market Using Web2 Connectivity I Nik Erzetic

- Channel: [ETHGlobal](https://streameth.org/ethglobal)
- Date: 2025-10-09
- Duration: 39:41
- Topics: Flare blockchain, trustless insurance, Web3 insurance, Flare Data Connector, FDC tutorial, OpenWeather API blockchain, decentralized insurance smart contract, Solidity weather data, onchain proof of loss, JSON API attestation, Hardhat Flare starter, minimum temperature insurance, policy creation smart contract, DeFi insurance market, web2 data onchain, weather-based payouts, jq filter Solidity, Ethereum-compatible insurance, blockchain weather oracle, smart contract tutorial
- Watch: https://streameth.org/watch/yt-2y8zZPH6Q7E
- YouTube: https://www.youtube.com/watch?v=2y8zZPH6Q7E

## Description

In this Flare Builder workshop, developer advocate Nik Erzetic walks through building a trustless insurance market using Flare’s Data Connector (FDC) to bring Web2 weather data onchain. Learn how to connect to the OpenWeather API, create decentralized insurance policies, and resolve payouts automatically based on verifiable offchain data.

Nik explains the full smart contract workflow—from policy creation, claiming, and settlement to using JSON API attestations for proof of loss. You’ll see how to integrate coordinates, minimum temperature thresholds, coverage amounts, and premiums into a decentralized application without centralized intermediaries.

This step-by-step coding session covers policy lifecycle management, smart contract security patterns, and the technical details of fetching, encoding, and decoding real-world weather data in Solidity. Perfect for blockchain developers looking to connect real-world data to DeFi and Web3 applications.

00:00 Introduction
01:33 Workshop details & quiz info
02:16 Using OpenWeather API
03:01 Insurance market concept
04:55 Policy creation process
05:39 Policy resolution rules
07:11 Decentralization of proof submission
08:09 Flare Data Connector overview
09:13 API requirements & JSON format
12:05 Weather station coordinates
13:32 Minimum temperature data
14:18 Flare Developer Hub & Hardhat starter
15:58 Smart contract structure
17:22 Policy data fields
18:37 Loss criteria & thresholds
19:14 Policy status enum
20:29 Creating a policy
23:44 Claiming a policy
26:59 Security in state updates
27:41 Resolving a policy with proof
29:42 JSON API verification onchain
31:09 Coordinate matching for verification
32:29 Paying out coverage on loss
33:04 Expiring a policy
33:49 Retiring unclaimed policies
35:01 AI signature hack for encoding data
36:58 Transforming API data for Solidity
38:35 Using jq filter for JSON parsing
39:10 Handling floating point numbers in Solidity

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🇺🇸 *ETHGlobal New York*
This workshop is specifically for ETHGlobal New York, a 3-day hackathon held August 15-17, bringing together the most skilled web3 developers, designers and product builders from all around the globe for a weekend-long adventure to advance the Ethereum ecosystem! Watch the full ETHGlobal New York 2025 playlist here: https://www.youtube.com/playlist?list=PLXzKMXK2aHh4Xze0ZeSWCSGsw25clPpvZ

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