Trezor Suite API integration services (OpenFinance / crypto data)

Deliverables checklist

• OpenAPI 3.1 / Swagger specification for every endpoint we expose
• Protocol report: Trezor Connect handshake, Trezor Host Protocol (THP) Bluetooth pairing, Blockbook query layer
• Runnable source code in Python (FastAPI) and Node.js (NestJS) for portfolio, transactions, swaps and staking
• Postman collection and pytest / Jest test suite covering happy path and recovery flows
• Compliance notes: GDPR, MiCA, FATF travel rule, AML monitoring hooks

Engagement models

Two ways to consume the work: source-code delivery from $300, where we hand over the complete code and docs and you pay only after you have verified the build, or a pay-per-call hosted API with metered billing and no upfront fee. Most teams start with the source delivery so they keep full control of their key material and infrastructure, then graduate to hosted endpoints for high-volume reconciliation.

We sign NDAs on request and can ship the code into a private VCS rather than email or shared drive. Every deliverable is reviewed by a second engineer before release, and we track defects against a written acceptance plan that you sign off before final invoice.

1. Crypto tax export to Koinly / CoinLedger

A self-employed trader connects their Trezor Suite via xpub and exports the year's transactions into Koinly. Our adapter normalises Suite's {type, amount, fee, target} shape to Koinly's universal CSV columns and supplies missing cost basis from CoinGecko or DefiLlama at the original block timestamp. The OpenFinance angle here is granting a third-party tax service consented, read-only access to crypto activity — analogous to PSD2 AISP for bank data.

2. Treasury reconciliation for a Web3 startup

Finance teams running Trezor-secured operating wallets need a daily snapshot reconciled against their general ledger. Our pipeline pulls balances by xpub, classifies inflows/outflows by counterparty (using the user's Suite labels), and pushes journals into Xero or QuickBooks. The pipeline runs server-side without ever touching the recovery seed; signing remains on the device.

3. Staking yield reporting

An Ethereum validator operator using Trezor Safe 7 needs MiCA-aligned disclosure of staking rewards. We pull validator data via the Suite Earn screen and Beacon Chain APIs, attribute rewards by epoch, and emit a monthly statement in PDF and JSON. Reward classification respects the user's jurisdiction (e.g. ordinary income vs. capital gain).

4. DeFi compliance trail via WalletConnect

Funds and family offices using Trezor for DeFi need an auditable session log: which dApp signed which message at what block. We capture WalletConnect v2 session metadata, store request payloads alongside on-chain receipts, and surface them through a dashboard for the compliance officer. Combined with FATF travel-rule fields, this scenario gives auditors a clean view of the operator's DeFi footprint.

5. Multi-wallet portfolio aggregation

A user holds Trezor, plus assets on a Ledger Live setup and a Coinbase Wallet — typical for prosumers. Our aggregator queries Trezor Suite Blockbook endpoints, Ledger Live's exported xpubs, and Coinbase Wallet's ENS, and de-duplicates positions across them. The result is one OpenFinance-style API a portfolio app can call to render holdings without managing derivation logic itself.

Account discovery via Trezor Connect

// Node.js — derive xpub through @trezor/connect-web
import TrezorConnect from '@trezor/connect-web';

await TrezorConnect.init({
  manifest: { email: 'dev@openfinance-lab.com', appUrl: 'https://openfinance-lab.com' }
});

const result = await TrezorConnect.getPublicKey({
  path: "m/84'/0'/0'",        // BIP-84 segwit account #0
  coin: 'btc',
  showOnTrezor: true          // user confirms on device
});

if (!result.success) throw new Error(result.payload.error);
const { xpub, serializedPath } = result.payload;
// → forward xpub to your Blockbook indexer for tx history

Statement export endpoint (pseudocode)

POST /api/v1/trezor-suite/statement
Content-Type: application/json
Authorization: Bearer <ACCESS_TOKEN>

{
  "xpub":      "zpub6rFR...",
  "coin":      "btc",
  "from_date": "2026-01-01",
  "to_date":   "2026-04-30",
  "format":    "csv"        // csv | json | pdf
}

200 OK
{
  "tx_count": 412,
  "download_url": "https://api.../exports/btc-2026-q1.csv",
  "expires_at":   "2026-05-04T00:00:00Z"
}

WalletConnect session webhook

POST https://your-app.example.com/hooks/wc-session
X-Signature: sha256=...

{
  "event":      "session_request",
  "topic":      "abc123...",
  "dapp":       { "name": "Uniswap", "url": "https://app.uniswap.org" },
  "method":     "eth_signTypedData_v4",
  "chain_id":   1,
  "address":    "0xabc...def",
  "submitted_at": "2026-05-03T14:21:08Z"
}

// On error: respond 4xx with { "error": "...", "retry_after": 60 }

Regulatory alignment

Self-custodial crypto data integration is governed by a different stack than traditional banking. Our pipelines align with the EU's Markets in Crypto-Assets Regulation (MiCA) for service-provider obligations, with FATF Recommendation 16 (the travel rule) for transfers above the relevant threshold, and with GDPR for the personal-data fields surfaced by Trezor Suite (labels, address book, IP at session). For US clients we layer FinCEN guidance on convertible virtual currencies on top of the same base.

Privacy posture

We never request the recovery seed or device PIN. Signing stays on the Trezor; xpub-only flows mean the server can read but not move funds. Stored fields are minimised: txid, block, amount, fee, plus user-supplied labels if you opt in. Logs are encrypted at rest and access is audited per request.

• Read-only by default; signing requires user confirmation on device
• Per-user API keys with rate-limits and IP allowlists
• Retention windows tunable by data class (tx vs. label vs. session)
• SBOM and dependency review on every release

About us

OpenFinance Lab is an independent studio focused on app protocol analysis and authorized API integration. Our engineers come from banks, custodial exchanges, payment gateways, and Bitcoin-core development; several have shipped production code against Trezor Connect, Blockbook and the major EVM RPC stacks. We move fast on research, but we are conservative about anything that touches keys.

• Crypto custody, hardware wallet integration, and treasury operations
• OpenBanking-style read-only AISP feeds adapted to crypto data
• Custom Python / Node.js / Go SDKs and test harnesses
• Full pipeline: protocol analysis → build → validation → compliance
• Source code delivery from $300 — receive runnable API source code and full documentation; pay after delivery upon satisfaction
• Pay-per-call API billing — access our hosted endpoints and pay only per call, no upfront cost; ideal for teams that prefer usage-based pricing

Contact

For quotes or to submit your target app and integration scope, open our contact page below. Include the chains you need, the data classes (transactions, balances, staking, swaps), and any existing infrastructure you want us to plug into.

Contact page

Engagement workflow

1. Scope confirmation: which chains, which datasets (tx history, staking, swaps, WalletConnect)
2. Protocol analysis and API design (2–5 business days)
3. Build, internal validation, and reproducible test fixtures (3–8 business days)
4. Documentation, samples, and acceptance test cases (1–2 business days)
5. Typical first delivery: 5–15 business days; multi-chain or staking-aware stacks may extend timelines

FAQ

What do you need from me to start a Trezor Suite integration?

How long does delivery take for a Trezor Suite-style integration?

How do you handle compliance and user privacy for crypto data?