Building the Future of Cross-chain Data: Router Protocol x Band Oracle v3

4 min readApr 7, 2025

The world of blockchain is growing increasingly modular, multi-chain, and data-hungry. In this rapidly evolving ecosystem, protocols can no longer operate in silos. Whether you’re building DeFi, deploying AI-powered strategies, or bringing Real-World Assets (RWAs) on-chain, one thing is clear:

Your application is only as powerful as the data it can access — across chains, in real time, and without compromise.

That’s why we’re thrilled to share our progress on a collaboration that’s been months in the making: Router Protocol x Band Protocol, a partnership that delivers free, secure, and cross-chain accessible price feeds to every developer building on Router-connected chains.

While the Band team recently published a deep dive on our successful end-to-end oracle relay from Band Oracle v3 → Router Chain → Ethereum Holesky, we wanted to offer a perspective from the Router side of the tunnel.

Let’s dive in.

Why This Matters: Data is the New Liquidity

At Router, we’ve always viewed interoperability as more than just moving assets — it’s about moving knowledge. Price feeds, identity states, governance decisions, intents — these are the new atomic units of DeFi and beyond.

Without reliable, real-time data transfer across chains, the vision of seamless DeFi, intelligent agents (DeFAI), and tokenized asset markets breaks down. With Band Oracle v3 + Router Protocol, we’re making trustless, open, real-time oracle data a baseline offering — not a luxury.

What We’ve Built: The Cross-chain Oracle Tunnel

Together with Band Protocol, we’ve completed a full-stack testnet relay from BandChain to Holesky (Ethereum testnet), using the Router bridge infrastructure.

Highlights from the Integration:

Data Source: Band Oracle v3 testnet
Bridge Infrastructure: Router Protocol
Destination: Ethereum Holesky Testnet
Delivery Mechanism: IBC Hooks → Router Chain → iReceive-compatible consumer contract
Example Transaction: https://holesky.etherscan.io/tx/0xa4b70b2d9d8d0a69a0d816b3f2de46ac134f19c88ce61d750ced6b37fa4fac36/advanced#eventlog

The delivered data includes mock price feeds for BTC and ETH, showcasing how any smart contract can access the Band Standard Dataset via Router’s generalized iReceive interface.

This lays the foundation for custom oracle logic, real-time financial triggers, and AI automation — all deployed trustlessly across chains.

Router Protocol’s Role: Data Infrastructure for the Multi-chain World

While Band provides the data, Router ensures that data can move securely and instantly across blockchains. Here’s how:

1. Cross-chain Abstraction Layer

Router provides a unified interface for contracts to receive and verify messages across heterogeneous blockchains (EVM & non-EVM). Whether it’s Solana, BSC, Ethereum, or Cosmos-based networks — if you can write a smart contract, you can now subscribe to oracle feeds via Router Protocol.

2. Developer Simplicity

With our iReceive interface, developers don’t need to worry about packet formatting, relayers, or finality across chains. You simply write a function to receive price data — and Router handles the rest.

3. Composable Data Infrastructure

Price feeds are just the beginning. Router is positioning itself as the execution and data movement layer of the modular crypto stack. Want to build AI agents that arbitrage across chains? Use Band Oracle + Router automation. Building RWAs that require off-chain price attestation on multiple chains? Router tunnels are the proof.

What’s Next: From Testnet to Mainnet and Beyond

As we move toward a planned mainnet release by the end of Q3, here’s what’s coming:

1. Co-branded Oracle Feeds

Band x Router will launch an open data oracle that any dApp can use — no signup, no fees. Just plug in and build.

2. Developer-ready Infrastructure

Documentation, SDKs, and boilerplate contracts will be released to empower devs to integrate Band Price Feed via Router with just a few lines of code.

3. Ecosystem Partnerships

We’re already exploring integrations with leading DeFi, RWA, and DeFAI projects to showcase real-world use cases. Want to be part of the launch cohort? Get in touch.

Why This Collaboration Sets a New Standard

The synergy between Band Protocol and Router Protocol reflects a larger shift in the crypto ecosystem:

From bridges to execution layers
From fragmented dApps to networked agents
From expensive oracles to free, open, public data utilities

And this is just the beginning. Router is evolving into the intelligence layer of crypto — Band feeds give it vision. Together, we’re not just relaying data. We’re laying the foundation for a modular, multi-chain, data-rich internet of value.

Ready to Build? You can already start exploring the testnet integration. Here’s the guide to get started. Follow us and Band Protocol on X for more updates as we prepare to launch the Ultimate Data Bridge for DeFi, DeFAI, and RWAs.