Arc is joining the Chainlink Scale program to deliver developers enterprise-grade data and interoperability infrastructure.
Arc now has a public path to external market data and cross-chain messaging on testnet, without teams having to stitch the whole thing together themselves.
Once you get into lending, treasury, settlement, tokenized assets, or FX, you usually need two things: trusted inputs from outside the chain, and a clean way to coordinate state and value across networks.
What you can do with this
1) Build price-aware product logic earlier
If your app needs a reference price, a market input, or some other verified external signal, you do not want to leave that to the last mile. Chainlink provides the data infrastructure for when product logic depends on more than balances and local contract state.
2) Test cross-chain finance flows on Arc testnet
A lot of teams evaluating Arc are not building single-chain products. They are testing treasury movement, collateral flows, settlement logic, or multichain finance apps. With Chainlink CCIP on Arc testnet and a current lane to Ethereum Sepolia, builders can start pressure-testing those paths earlier.
3) Build against real infrastructure instead of placeholders
The useful shift here is simple: if external inputs or cross-chain messaging are part of the product, they should be part of the testnet build too. That reduces the gap between a clean demo and something a team can actually ship.
Where Chainlink fits
Arc is built for onchain finance. But serious finance apps still need outside inputs and, in many cases, coordination beyond a single chain.
That is where Chainlink fits.
On Arc today, the public surface is pretty straightforward: Chainlink powers the oracle side of the builder stack, and CCIP is the clearest live interoperability surface on Arc testnet. For builders, that creates two solutions:
- Use Chainlink Data Streams when the app depends on trusted external inputs.
- Use Chainlink CCIP when the app needs to coordinate with another chain during testing.
Arc Testnet Contract Addresses:
- The CCIP Router contract address for Arc testnet is 0xdE4E7FED43FAC37EB21aA0643d9852f75332eab8 .
- The chain selector for Arc testnet is 3034092155422581607 .
- Additional contract addresses for Arc testnet include:
- ARM Proxy: 0xD610B8f58689de7755947C05342A2DFaC30ebD57
- Token Admin Registry: 0xd3e461C55676B10634a5F81b747c324B85686Dd1
- Registry Module Owner Custom: 0x524B83ae8208490151339c626fd0E35b964483e3
- CCIP Config: 0x3F1f176e347235858DD6Db905DDBA09Eaf25478a
Common patterns for builders
- Lending, treasury, and trading apps
- Use external inputs in pricing, risk, or settlement logic.
- Cross-chain treasury and collateral flows
- Test how contracts on Arc coordinate with Ethereum Sepolia before mainnet decisions get locked in.
- Tokenized asset and FX products
- Design around real market inputs and cross-chain coordination earlier instead of bolting them on after the product shape is already fixed.
Start here:
If you are building on Arc and using Chainlink, drop what you are working on in the comments. Interested in which patterns teams are testing first.
