Zondax has built and run Filecoin integration infrastructure since 2019 some of the oldest continuously-operated tooling in the ecosystem. This proposal sustains the layer that connects Filecoin to the outside world: the Ledger custody stack, the Rosetta integration suite, and the public node, archival, and RPC infrastructure underneath them. This infrastructure carries production traffic for named consumers: Ledger: every FIL holder using a Ledger device. We maintain the Ledger Filecoin device app, the Rust/JS/Go libraries, and the Ledger Live integration through which FIL holders custody and move funds from a hardware wallet. That integration runs on our nodes, without them, it has nothing to talk to. Coinbase integrates Filecoin through the Rosetta–Filecoin suite (lib, proxy, indexing proxy) we maintain, and extracts genesis-to-date chain data from our archival nodes with a dedicated deployment workaround for Coinbase’s extraction now in production. Binance extracts genesis-to-date data from the same archival infrastructure. The Beryx public API and explorer and through them every consumer of that data layer, including FIDL (Traces), the Filecoin Security dashboards, and the ecosystem's data dashboards run on the node and archival infrastructure funded here. The API alone serves ~5M requests/week. Exchanges, storage providers, and builders query the public RPC directly instead of running their own nodes, and we walk them through every network upgrade. And these are only the consumers we can name. The public services don't track user identities; the consumers identified above are those whose volume required explicit rate-limit exceptions Coinbase and the Filecoin Foundation's own security team among them. The references listed in this proposal are themselves frequent users of this infrastructure. Our archival nodes hold complete chain history since genesis and have already let exchanges backfill data they could not reconstruct alone. What stops if this layer stops: FIL custody through Ledger Live breaks for every hardware-wallet holder — there is no alternative maintained integration. Coinbase's Rosetta path falls behind the next Lotus release and its archival extraction ends, as does Binance's. The Beryx API and explorer go dark, taking FIDL's traces source, the Filecoin Security dashboards, and ~5M requests/week of ecosystem queries with them. And the next network upgrade proceeds with no one tracking exchanges and providers through the transition. None of these consumers has a fallback in place, because for six years this layer has been the fallback. Note: this project is hardware- and operations-heavy. A large share of cost is node capacity, archival storage, and devops hours rather than software development, which is why the ask is larger than a thin software-service proposal of comparable scope.