Application for Filecoin ProPGF Batch 3

Blockscout block explorer

https://github.com/blockscout

https://www.blockscout.com/

Mojmir Racak, Head of BD, Telegram @Mojmir_R

We maintain the primary FEVM block explorer for mainnet and testnets at https://filecoin.blockscout.com/. It is a vital tool for developers and chain users to check transactions, verify contracts, and interact with onchain data via the API. We've worked with the foundation on the explorer over the past several years, including a custom project to enable Filecoin address support (f1, f2, f3, and f4) in the explorer.

Partial

Blockscout is open code and available for singular projects to use as desired, however we recently updated from completely open-source to a license which restricts commercial reselling, as RaaS providers were taking advantage of the open codebase to resell the explorer to other users.

Blockscout requests funding to cover the upkeep, hosting, and maintenance of its Filecoin block explorer for a 12-month period beginning in December 2026. This grant keeps the Mainnet and Calibration Testnet instances online, indexed, and current with Filecoin protocol upgrades. The goal is to sustain infrastructure the ecosystem already depends on and provide updates as needed to support the chain. Previously, this work was covered by the foundation. Our ongoing hosting and maintenence contract with the foundation expires in November 2026. Core workstreams: - Hosting, indexing, and uptime for Filecoin Mainnet (314) and Calibration Testnet (314159), including archive node support - Maintenance to keep the explorer accurate through Filecoin network upgrades - Smart contract verification support (Solidity and Vyper) - REST and Etherscan-compatible API availability for storage providers and builders - Documentation upkeep

$60,000

Indirect

Indirect

Indirect

An up-to-date, full-featured explorer is a necessary component of any chain. It provides the receipts and transactional proof of all activity. Blockscout is a leader in the exploration space and trusted by many projects as their source of truth. This creates trust which is the foundation for new deals, profitibility and adoption. This grant keeps the Filecoin Mainnet and Calibration Testnet explorers hosted, indexed, and current with protocol upgrades, with stable contract verification services and reliable REST and Etherscan-compatible APIs. This is vital infrastructure for the chain, and results in developers, storage providers, clients, and agents with a transparent, accurate, reliable and machine-readable view of FEVM activity. Fee data and token flows stay transparent, and deployed contracts remain verifiable in production.

Blockscout is a primary data source used to measure onchain metrics for projects deployed on Filecoin. Projects can use our APIs to query all data, or download csvs with relevant data from the UI. One direct metric we can look at directly is contracts verified via Blockscout. This is measured via the verified contracts endpoint, and we would target a 2x increase in verified contracts on Blockscout over the course of the year.

We work closely with the Filecoin team currently on updates, fixing any issues and custom development. Here are a few references: - Eva Shon "Blockscout’s Filecoin explorer offers an informed way of looking at Filecoin EVM contracts and their interactions that really helps builders see more of what’s going on. Their EVM bytecode database across many chains has also been a great help in easing contract verification which often has lots of gotchas.” - Jennifer Wang "blockscout has been our go to explorers as we enable more building in the user smart contract land!"

Blockscout is maintained by a distributed team of ~19 engineers and contributors, building blockchain explorer infrastructure since 2018. Production deployments span 100+ EVM-compatible chains serving chains with billions of transactions and enterprise SLA requirements. - Eva Zhang: CEO, former CEO of Alibaba Pay. LinkedIn: https://www.linkedin.com/in/evayezhang - Ulyana Skladchikova: Product Lead. LinkedIn: https://www.linkedin.com/in/ulyanas/ - Mojmir Racak: Head of BD

Most risks relate to changes beyond the maintenence scope such as Filecoin network upgrades or feature requests which require additional engineering beyond our maintenence costs. Infrastructure costs can also rise based on storage requirements and chain state growth. These all seem manageable within the context of the grant and our open communication channels with the team.

We continue to make product updates and improvements to the explorer. Our team has worked closely with the Filecoin team for several years and are committed to making your ecosystem explorer the best it can be. We are familiar with the architecture and customizations we've done and hope to continue this work!

The form is straightforward, looking forward to feedback and happy to clarify any additional information or provide more details. Thank you.