[DO NOT MERGE] feat: pure-RPC on-chain position discovery (no subgraph)

[dglowinski]

⚠️ DO NOT MERGE — depends on an unmerged SDK branch and is up for review/discussion only.

Summary

Adds a pure-RPC alternative to subgraph-based sub-account & position discovery. Previously the SDK's "onchain" account adapter still relied on a subgraph (trackingActiveAccounts) to learn which sub-accounts and vaults an owner touches. This flips the onchain account path to discover positions entirely over RPC.

This lite change is a one-line config: the onchain adapter now sets accountPositionDiscovery: 'onchain', so the plan-time/fresh SDK instance (which the portfolio loads through) uses the new discovery path.

How it works (SDK side)

The heavy lifting lives in the SDK — branch feat/onchain-account-discovery in euler-xyz/euler-sdks (must be linked/published for this to run):

• A deployless discovery lens (AccountDiscoveryLens.sol) called via eth_call with no to and data = creationCode ++ abi.encode(owner, subAccountIds, vaults, evc); the constructor brute-forces vault.balanceOf(subAccount) for deposits and EVC.getControllers/debtOf for borrows, returning (address[][] deposits, address[][] borrows).
• The subAccounts × vaults workload is split into chunks and fired as parallel unbatched eth_calls so the RPC provider spreads them; no single call approaches the eth_call gas ceiling.
• Vault set defaults to a labels-based resolver (product + earn vaults, including deprecated); borrows are 100% complete via getControllers regardless of the vault set.

Validation (0x8A54C278D117854486db0F6460D901a180Fff517, mainnet, 21 active sub-accounts)

• Discovery ~0.7 s (labels warm) + ~0.3 s one-time labels fetch (cached in-app) — well under the 5 s target
• 21/21 sub-accounts, 19/19 borrows vs the subgraph baseline; verified live in the app (spy mode) — full portfolio rendered, no trackingActiveAccounts subgraph query
• 405 SDK tests pass, incl. new adapter unit tests

Notes

• Requires the linked SDK build (feat/onchain-account-discovery); not mergeable until that lands and is versioned.
• Vault-type classification still uses the subgraph (vaultTypeAdapter: 'subgraph'), unchanged.

🤖 Generated with Claude Code

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[railway-app]

🚅 Deployed to the euler-lite-pr-711 environment in euler-lite(dev,PR previews)

Service	Status	Web	Updated (UTC)
dev-build	❌ Build Failed (View Logs)	Web	Jul 31, 2026 at 9:58 am