Integrating All For One: DeFi For All — wallets, swaps, and on-chain activity

Three chains — Ethereum, BNB Smart Chain, and Harmony — sit behind every balance the app shows, per its Google Play listing. That single fact decides the whole integration. There is no account to sign into and no user database; as the developer states it, the encrypted seed lives only on the phone, and nothing is registered server-side. So the data a third party would want isn't locked in a portal. It's on the public ledger, keyed to the wallet addresses the user already holds, plus a thin layer of app-side feeds the wallet draws on for prices, rankings, and trade routing.

That shape favours a streaming read. We index the user's authorized addresses across the three chains, follow new blocks as they land, and keep a per-chain block height we can rewind to. The work below maps what's reachable, the snippet that pulls it, and what arrives as code.

Bottom line: the route we'd take is to index the three chains for the addresses you're authorized to read, stream new transfers and swaps from a per-chain cursor, and reconstruct DEN trades as single events. The app's own feeds — prices pulled live, the ECLIPSE ranking, the Whale Watching deltas — come from analyzing its backend traffic under your authorization. Two reads, one normalized output.

The data, surface by surface

Everything below is something the app already puts in front of a user. The job is to make each of these queryable and syncable from your side.

Getting in: routes that fit a key-holding wallet

A self-custodial app changes which routes are real. There's no server-side account state to consent into, so two of the usual paths collapse into one: read the ledger, and read the app's own feeds. Here's how we'd weigh them.

1 · On-chain indexing of authorized addresses

This carries the bulk of the value — balances, holdings, transfers, and the on-chain side of every swap. Reachable through public nodes or an indexer for ETH, BSC and Harmony. Effort is moderate and the durability is high: the ledger format doesn't churn the way a private endpoint would, so the read keeps working across app updates. We set up the node access and the indexer with you during onboarding. This is the route we'd recommend as the backbone.

2 · Protocol analysis of the app's backend feeds

Prices, the news feed, ECLIPSE rankings and Whale Watching aren't on the ledger — they're served to the app. We map that traffic and rebuild the calls under your authorization. Effort is higher and durability is medium, since a backend can change shape; we account for that by re-validating the captured calls when the app ships a major update. Use this where the personalized or curated views matter to your product.

3 · User-consented device capture

Where a view is tied to a specific install — a particular wallet's notification stream, say — we can capture it from a consenting device session under explicit user consent. Narrow by design, and we keep it to what the customer actually needs. It supplements the first two routes; it doesn't replace them.

On the wire: streaming a wallet's activity

The core of route 1 is a follower that backfills from a known block and then tracks the head, committing its position as it goes. Illustrative, and confirmed in shape during a build against public nodes:

# Follow the addresses the user authorized, across the three chains the
# app shows. Cursor = last committed block height, per chain — a restart
# resumes here instead of re-reading from genesis.
CHAINS = {"eth": 1, "bsc": 56, "harmony": 1666600000}   # chain ids

def follow(addresses, cursor):
    for chain, last in cursor.items():
        node  = rpc(chain)                  # public node / indexer
        head  = node.block_number()
        safe  = head - CONFIRMATIONS[chain] # stay a few blocks behind the tip
        for blk in range(last + 1, safe + 1):
            for ev in node.transfers(blk, of=addresses):
                yield normalize(chain, ev)  # -> normalized event (see schema)
            cursor[chain] = blk             # commit position

def normalize(chain, ev):
    return {
        "event_id": f"{chain}:{ev.tx}:{ev.log_index}",   # unique, replay-safe
        "wallet":   ev.address,
        "kind":     classify(ev),            # transfer | swap | onramp
        "asset":    token_map(chain, ev.token),
        "amount":   ev.amount,
        "block":    ev.block,
        "ts":       ev.timestamp,
    }
      

Two details that matter for this app specifically. CONFIRMATIONS differs per chain — Harmony and BSC settle differently from Ethereum, so the safe-tip offset isn't one number. And classify is where DEN swaps get reassembled: a single user trade can touch several transfer logs, and we fold those legs back into one swap event rather than emitting three loose transfers.

One schema across ETH, BSC and Harmony

So your code never branches on chain, every read lands in the same record. A balance and a swap, side by side:

{
  "wallet": "0xabc…",                 // address the user authorized
  "chain":  "bsc",                    // eth | bsc | harmony
  "asset":  { "symbol": "CAKE", "contract": "0x0e09…", "decimals": 18 },
  "balance": "184.20",
  "as_of_block": 38114502
}

{
  "event_id": "bsc:0x9f…:12",         // chain:tx_hash:log_index
  "kind": "swap",
  "in":  { "symbol": "BNB",  "amount": "0.50" },
  "out": { "symbol": "CAKE", "amount": "184.20" },
  "route": "DEN",                     // partner Decentralized Exchange Network
  "applied_slippage": "0.8%",         // the app sets this automatically
  "ts": "2026-06-07T18:22:11Z"
}
      

What you get, as code

The deliverable is something that runs against your authorized wallet set on day one, not a document about it.

• A runnable client in Python or Node.js: the follower above, the swap reassembler, and the normalizer, wired to nodes for all three chains.
• A stream/queue ingestion path with replay: events land on a queue, the block-height cursor is persisted, and re-running a range is harmless because each event carries its own id.
• An automated test suite that fixes a block range on each chain and asserts the normalized output, so a change in node behaviour shows up as a failed assertion, not a quiet drift.
• A cross-chain token map so the same asset reconciles to one symbol whether it's held on ETH, BSC or Harmony.
• The captured calls for the app-side feeds (prices, ECLIPSE, Whale Watching), rebuilt as functions.
• An OpenAPI description of the normalized read surface, a short protocol & auth-flow report covering how the backend feeds are reached, and interface docs with a data-retention note.

Keeping the stream honest

Two failure modes are worth naming for a chain follower. A reorg can rewrite a block you already read — so the follower stays a confirmation window behind the tip and re-scans that window before committing, which keeps a momentarily-orphaned transfer out of your ledger. The second is throughput: public nodes rate-limit, so the client backs off and resumes from its cursor rather than dropping a range. Freshness is therefore a dial — tighten the confirmation window for speed, widen it for certainty — and we set it per chain with you.

MiCA, consent, and a public ledger

The wallet reads as European — German text in the listing, EU framing — so the relevant regime is the Markets in Crypto-Assets Regulation (MiCA), supervised by ESMA together with national competent authorities. MiCA's authorization rules bear on crypto-asset service providers — exchanges, custody, transfer services — and its transitional periods have been winding down toward a mid-2026 cutover, per ESMA's own statements. A self-custodial wallet where the user holds the keys is a different posture: we aren't custodying or transferring on anyone's behalf.

For the integration, the dependable basis is the user's own authorization of the addresses they control, layered over data that is already public on-chain. ESMA's 2025 transfer-services guidelines fold the Transfer of Funds (Travel Rule) information requirements into MiCA, which matters if your product touches transfers — we flag where it does. How we operate: authorized and logged access, data minimized to the addresses and records you need, seed material never requested or handled, and an NDA where the engagement calls for one.

Edges we plan for

Two app-specific things we handle so they don't surprise you downstream.

Bridged tokens across chains. The same asset can appear under different contract addresses on ETH, BSC and Harmony, and Harmony in particular carries bridged representations. We maintain the cross-chain token map so a user's holdings collapse to one symbol and one position, rather than three look-alikes that inflate the portfolio.

DEN as a routing layer, not a venue. The app's automatic best-rate search and automatic slippage setting mean a trade's on-chain footprint doesn't read like a simple swap. We reconstruct the user's intent from the legs, so reconciliation and P&L see one trade with one effective rate. We work this out against a consenting account or a test wallet, arranged with you during onboarding — no setup is asked of you before we begin.

What it costs, and how the build runs

A first drop is the runnable follower reading your authorized addresses across the three chains, usually inside one to two weeks. Source-code delivery starts at $300: you receive the client, the test suite, the token map and the interface docs, and you settle up only after it's in your hands and the read checks out. If you'd rather not run anything yourself, the same integration is available as a metered endpoint — you call our hosted API and pay per call, with nothing upfront. Tell us the app and what you want off its data on our contact page, and access is arranged with you from there.

Screens we worked from

Store screenshots of the views the data maps back to — tap to enlarge.

Wallets in the same bracket

Same-category self-custodial wallets, named so you can see where a unified read across several of them would land. Neutral context, not a ranking.

• Trust Wallet — broad multi-chain mobile wallet; holds addresses, token balances and in-app swap history across many networks.
• MetaMask — EVM-focused wallet; account addresses, token holdings and dApp transaction history on Ethereum and compatible chains.
• Coinbase Wallet — self-custody wallet covering balances, transfers and on-chain activity across several chains.
• Exodus — desktop and mobile wallet; portfolio balances, swap records and transaction history across many assets.
• Rabby Wallet — EVM wallet that surfaces per-chain balances and pre-transaction simulation data.
• Bitget Wallet — multi-chain wallet with built-in swap and market data alongside address balances.
• Zerion — portfolio-first wallet aggregating balances and DeFi positions across EVM chains.
• 1inch Wallet — wallet built around DEX aggregation; holds swap routes and on-chain trade history.
• Phantom — multi-chain wallet covering balances and transaction history across its supported networks.

Sources, and who checked this

Checked on 8 June 2026 against the app's store listing and vendor site for features and chain support, and against ESMA for the regulatory frame. The DEN routing, the Transak on-ramp, the supported chains and the self-custody / no-registration claims come from the developer's own pages; MiCA status comes from ESMA. Primary sources:

• Google Play listing — All For One: DeFi For All
• allforone.app — DEN, Transak on-ramp, self-custody claims
• App Store listing — All For One
• ESMA — Markets in Crypto-Assets Regulation (MiCA)

OpenFinance Lab · on-chain integration assessment, 2026-06-08.

Questions integrators ask us

How do you keep a wallet's balances in sync when there is no account to log into?

Self-custody means the data lives on the public ledger, not behind a login. You hand us the addresses; we index ETH, BSC and Harmony for them and follow new activity block by block, keeping a per-chain block height as a cursor. If the process restarts it resumes from that height, and a short confirmation window guards against a chain reorg rewriting recent blocks.

Can you tell an All For One swap apart from an ordinary token transfer?

Yes. Trades route through the partner Decentralized Exchange Network (DEN), which can settle as several on-chain legs. We model that routing so a multi-hop swap reconstructs as one trade with an in-token, an out-token and an effective rate, rather than three unrelated transfers in your ledger.

Does pulling on-chain data touch my seed phrase?

No. The encrypted seed stays on the device, as the app describes it, and we never ask for it. We work from public wallet addresses you authorize plus the app's own backend feeds — prices, rankings, Whale Watching — captured by analyzing its traffic under your authorization.

Which chains can you cover today, and what happens when the app adds more?

ETH, BNB Smart Chain and Harmony are the chains the listing names today. Because every record normalizes to one schema keyed by chain, asset and address, adding a chain the app ships later is a config and node change, not a rewrite of the ingestion path.