Engineering
Engineering
How we build — paymasters, MPC key generation and the SDKs.
Solana Is Being Rebuilt Around Latency, Not Throughput
In August 2026 Solana cut its slot time below 400ms for the first time since genesis, and block capacity had already risen 66% to 100M compute units. But finality still takes 12.8 seconds — the upgrade that changes that is scheduled, not shipped. What is actually live, what is not, and why the roadmap is a latency story rather than a TPS one.
September 7, 2026 · 15 min read
JPMorgan 13F Q2 2026: What the SEC Filing Actually Shows
JPMorgan reported $1,807,041,234,839 across 34,064 information-table rows for the quarter ended 30 June 2026. We parsed the original SEC XML twice and reconciled it to the dollar. Here is what the filing shows on the iShares Ethereum and Bitcoin trusts, Strategy, the bitcoin miners and the semiconductor names — and why the same filing produces different position counts, share totals and rankings depending on how the rows are read.
September 2, 2026 · 18 min read
Bypassing the 3% Card Tax: How I Built an x402 Settlement Layer for AI Agents and Travelers on Arbitrum
A $340 resort checkout loses $11.90 to five intermediaries before it reaches the hotel — three days later. Here is how I built Furlpay's x402 settlement layer on Arbitrum instead: the actual contract code, measured gas benchmarks from the 34-test suite, the paymaster math behind zero-gas UX, and a direct answer to 'why not just use Stripe?'
July 8, 2026 · 11 min read
Arbitrum vs Base for Payments: Which Layer 2 Should You Settle On?
Both are strong Ethereum Layer 2s with sub-cent fees. For stablecoin payments the deciding factors are settlement finality, ecosystem maturity, and where institutional volume already lives. Here is the honest comparison.
July 6, 2026 · 6 min read
Integrating Furlpay with Arbitrum: Payments, x402 and Contracts on the Largest L2
Furlpay's settlement stack is going Arbitrum-first. Here is exactly what we shipped — an x402 facilitator that settles on Arbitrum, a unified USDC payments API, a chain registry, and four Solidity contracts with a green 17-test suite — and what ships next.
July 5, 2026 · 9 min read
Designing 2-of-2 MPC Key Generation for Self-Custody
No single private key is ever generated. Here's how Furlpay splits signing across a device passkey share and an HSM policy share.
June 28, 2026 · 6 min read
Bypassing the Gas Crisis: ERC-4337 Paymasters on L2 Networks
Nobody should need ETH just to send USDC. How Furlpay uses ERC-4337 account abstraction and Paymasters to make gas disappear.
June 15, 2026 · 5 min read
Solving Card Declines: Time-Locked Pre-Authorization Escrows
Why self-custodial cards get declined at gas pumps and hotels — and how Furlpay's time-locked escrow contracts fix pre-authorization holds.
June 1, 2026 · 5 min read
The Death of the Seed Phrase: WebAuthn & Device Trust
Furlpay replaces the 12-word seed phrase with phishing-resistant WebAuthn passkeys bound to your device's secure hardware.
May 28, 2026 · 5 min read