Farcaster hubs / Snapchain

github.com · Storage · 1 record · JSON

Farcaster hubs / Snapchain — storage RENT, actively metered Storage

fails: quotaemail?card?R

github.com/farcasterxyz/protocol/blob/main/docs/SPECIFICATIO · farcaster · storage/farcaster-hubs-snapchain-storage-rent-actively-metered · JSON · compare

Free tier	Storage is allocated in integer units per fid and must be BOUGHT from the Storage Registry contract on Optimism (0x00000000fcCe7f938e7aE6D3c335bD6a1a7c593D). Each CRDT specifies messages-per-unit, so the unit is a message count, not bytes. unit mixed; metered on stored-bytes
Price	none stated
Per-object cap	not stated
Retention	not stated
Egress	n/a — hubs replicate messages, media is a URL in the cast body pointing at an external host (often Cloudflare Images / imgur).
Identity	email (placeholder) not published
Binding	none no constraint of a named kind was recorded; the verdict rests on the quota sentence rather than on a named limit
Interface	unknown grpc
Tooling	gRPC hub API (submitMessage); `@farcaster/hub-nodejs`. Storage must be purchased on-chain before a message is accepted.
Composes with	None. Media is never stored by the protocol — a cast embed is a plain URL. Farcaster is a message log with paid rent, not a file store.
Reliability	Rent model means capacity is explicitly priced, which is the opposite of the brief. Snapchain (2025 rewrite) preserves the rent model.
Notes	Storage is allocated in integer units per fid and must be BOUGHT from the Storage Registry contract on Optimism (0x00000000fcCe7f938e7aE6D3c335bD6a1a7c593D). Each CRDT specifies messages-per-unit, so the unit is a message count, not bytes.
Evidence rung	reported One page read moves it to documented.
Checked	2026-10-21 (inherited); stale on 2026-11-04

Evidence (2)

date	source	what it proved
2026-10-21	raw.githubusercontent.com/farcasterxyz/protocol/main/docs/SP	'The Storage registry contract keeps track of the storage allocated to each fid. The storage for an fid is denominated in integer units. Each CRDT specifies the number of messages it can store per unit.'; 'For a message to be accepted, the fid must be registered in the Id registry, and signed with a valid signer present in the Key registry, and the fid must have enough storage allocated in the Storage registry.'
2026-10-21	docs.farcaster.xyz/learn/architecture/storage	probe: GET -> 404 (moved); docs.farcaster.xyz is a Next.js shell with no server-rendered quota table

More fields (2)

{
 "verdict_note": "PLAN.md §3.2 rules fails-quota by default, because no row in this set clears 500 GiB per unit for a user.",
 "dead_end": {
  "failure_class": "quota",
  "why": "Storage is allocated in integer units per fid and must be BOUGHT from the Storage Registry contract on Optimism (0x00000000fcCe7f938e7aE6D3c335bD6a1a7c593D). Each CRDT specifies messages-per-unit, so the unit is a message count, not bytes.",
  "retry_when": null,
  "first_recorded": "2026-10-21"
 }
}

Unknown or withheld values (9)

$.extras.dead_end.retry_when process
$.free_tier.notes process
$.identity_cost.detail defaulted
$.identity_cost.kind identity-defaulted
$.interface interface-unknown
$.per_object_cap.notes not-extracted
$.per_object_cap.stated not-extracted
$.retention.notes not-extracted
$.retention.stated not-extracted