The Open House Singapore program launches a three-week online buildathon on September 14, followed by a three-day in-person Founder House expected in November, with exact dates to be confirmed. Applications are live at arbitrum-singapore.hackquest.io. Robinhood Chain, an Arbitrum Orbit chain focused on tokenized stocks and real-world assets, is co-sponsoring the event and has reserved at least one top prize slot for projects building on its infrastructure.

The prize structure divides the pool into three buckets. The open category pays out $70,000 total across three placements ($40,000, $20,000, and $10,000 in USDC), with prizes split 50 percent upfront and 50 percent upon hitting agreed milestones. A separate promising products track, aimed at AI agent applications and new financial primitives, offers $15,000 split across three winners; this track does not follow the same milestone-based split structure as the other categories. The Arbitrum Foundation also set aside $30,000 in milestone-based grants awarded case by case, also on the 50/50 schedule. The Arbitrum Developers account on X described the broader global program as "built for founders who are serious about shipping, not just weekend builders." The Singapore event's $415,000 prize pool is part of a broader $800,000 global prize program that spans multiple cities.

Singapore is the fourth and final city in Arbitrum's 2026 global Open House tour, which has already visited New York, Dubai, and London. The choice carries regional logic. Singapore is home to more than 2,300 crypto and blockchain companies and functions as a de facto regulatory gateway for Southeast Asia, where developer communities in Vietnam and Indonesia have recorded annual growth rates of 31 percent and 34 percent respectively, according to GitHub data. Banking access for digital asset firms engaging with Singapore's licensing environment remains a friction point: close to 60 percent report difficulty obtaining basic banking services, a problem that on-chain financial rails are partly designed to address. Robinhood Chain's pitch is relevant here too. The network, which launched its public mainnet on July 1, 2026, offers retail access to tokenized US equities such as NVDA and AAPL around the clock at 100-millisecond block times. In markets across Southeast Asia where retail brokerage access to US stocks is expensive or slow, that proposition has drawn adoption quickly: the chain surpassed 420,000 real-world asset holders within six weeks of launch.

The Singapore event is also expected to attract applicants from South Asia. Arbitrum's earlier Bengaluru hacker house demonstrated strong regional engagement, with more than 550 participants in its learn track, $103,000 distributed in prizes, and IIT Roorkee taking first place. Geographic and flight proximity makes Indian and Sri Lankan founders a realistic part of the Singapore event's applicant pool.

On the protocol side, Arbitrum One and Arbitrum Nova are scheduled to activate ArbOS 61 Elara on August 20 at 17:00 UTC. The upgrade also corrects gas refund logic bugs introduced in ArbOS 60 that affected Dynamic Pricing behavior, an important distinction that explains the version increment from 60 to 61. The most concrete change for developers is a fourfold increase in the contract size limit for Stylus contracts, the tooling that lets developers write smart contracts in Rust, C, and other languages that compile to WebAssembly, rather than Solidity. The ceiling rises from 24 kilobytes to 96 kilobytes. Standard Solidity contract limits are unchanged. The upgrade also grants Offchain Labs a two-year mandate to adjust the minimum layer-2 base fee within a band of 0.01 to 0.10 gwei. The current floor sits at 0.02 gwei, set in January 2026. Offchain Labs stated in the governance forum that the authority is intended to let the team react quickly to capacity changes and that the DAO can revoke the delegation through standard governance at any time. The upgrade was audited by Trail of Bits at no cost to the DAO. Community members raised procedural concerns during the forum discussion: PennBlockchain critiqued the practice of bundling multiple substantive changes into a single governance proposal, while MconnectDAO raised concerns about on-chain enforcement mechanisms for the new delegation.

A third component of ArbOS 61 is a compliance transaction filtering tool for operators of Orbit chains (independently operated chains built on Arbitrum's stack). The feature is disabled by default on Arbitrum One and Nova and only available as an opt-in for chain operators. When enabled, it works at two layers: the sequencer blocks restricted transactions before they are ordered, and the state transition function prevents those transactions from entering through a bypass known as the Delayed Inbox. Operators configure the tool to reference external screening providers such as TRM Labs or Chainalysis, with flagged addresses stored as salted SHA-256 hashes rather than in plaintext. The practical relevance extends beyond Southeast Asia. Orbit chain operators in African markets such as Nigeria, Kenya, South Africa, and Ghana, which are actively developing licensing frameworks for virtual asset service providers, can now access protocol-level compliance tooling without requiring Arbitrum One to change its permissionless character.

Arbitrum's first mentorship cohort, which completed its eight-week run in 2026, provides a reference point for what these programs can produce. Of 902 applicants, 13 teams were selected (a 1.4 percent acceptance rate) and 10 reached Demo Day. The program arranged more than 40 investor introductions before Demo Day itself, and the cohort collectively raised more than $1 million during the eight weeks while drawing more than 25 venture capital firms to its final showcase. Winners Carbon, LayerV, T3tris, and Capa split a $100,000 prize pool. Carbon alone secured $1 million in committed capital alongside a $2.5 million pipeline. Capa posted 150 percent month-over-month volume growth during the program, and Bond Credit grew its total value locked tenfold. Five of the 13 teams launched on Robinhood Chain's testnet or mainnet.

In a related ecosystem development, Stripe has integrated USDC payments on Arbitrum across more than 100 countries. The integration has particular relevance for builders in high-inflation markets in Latin America and for founders in South Asia and Africa who previously faced friction accessing dollar-denominated payment rails.

ARB, Arbitrum's governance token, traded around $0.08 as of late July 2026 against a reported all-time high of $2.40, giving it a market capitalization near $517 million across a 10-billion token supply. The broader Arbitrum ecosystem holds roughly $900 million in tokenized real-world assets across all its chains, with DefiLlama estimating total value locked on Arbitrum One between $1.5 billion and $2 billion.