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Sim is a real-time blockchain data API service launched by Dune, providing developers with multi-chain wallet data query capabilities through a unified interface. It supports fetching token balances, transaction history, NFT holdings, token information, and holder lists for any address, covering 60+ EVM chains and Solana. Sim offers webhook subscriptions to push real-time events like balance changes and on-chain activities, replacing polling. Its data is normalized, enriched with prices, metadata, and liquidity flags, making it easy to integrate into wallets, analytics tools, or DeFi applications.
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About sim
Sim is a real-time multi-chain data API platform launched by Dune, designed to provide developers with low-latency on-chain data access. Its core business includes a Balances API for querying account assets across chains, a Transactions API for analyzing transaction history, and a Price API that calculates real-time token prices based on DEX pool states.
Its core competitiveness lies in its low-latency, multi-chain architecture: it indexes data from 65+ chains, delivers data within 300ms of block propagation, and maintains a p99 request latency of 500ms. Additionally, its price API derives prices directly from DEX pools rather than aggregators, avoiding stale quotes, and uses a basket of stablecoins rather than a single anchor to resist depeg shocks.
The market pain point it addresses is the trade-off developers face between slow, expensive general-purpose indexers and fast but narrow single-chain APIs. Sim offers a unified real-time data layer that covers multiple chains without requiring developers to run their own indexing infrastructure.
In the past six months (2026-03-01 to 2026-09-01), Sim's most significant development was its sunset announcement. In May 2026, Dune disabled new signups for Sim, and on August 1, 2026, the service was officially shut down. Existing users were offered prorated refunds and migration support to alternative providers such as Moralis, with Dune citing a need to focus on its core data platform. This means Sim is no longer accepting new users and has effectively ceased operations as of the end of this period.
Dune Sim (sim.dune.com) made significant progress in Q2 2026, launching the DeFi Positions API on April 1, 2026. This API provides protocol-aware positions across major EVM chains (Ethereum, Arbitrum, Base, BSC, Polygon, Avalanche) with real-time data, covering lending, liquidity pools, yield vaults, and NFT-based positions. It features >95% protocol coverage vs. DeBank, new chains within ~1 week, and a significantly lower price point.
On April 24, 2026, Dune introduced Sim's real-time token pricing engine, which tracks pool states across 65+ chains, derives prices from current DEX liquidity (Uniswap, Curve, Balancer), and optimizes for actionable trade prices rather than theoretical mid-prices. The system uses a graph-based routing algorithm that accounts for price impact and excludes illiquid pools.
However, on May 18, 2026, Dune announced the sunsetting of Sim, effective August 1, 2026. New signups were disabled immediately; existing customers retained access until August 1. Dune cited a strategic pivot to focus on its core data platform (dune.com). Official migration support was provided to Zerion API, with codemod tools and a ~2-hour setup. Prepaid amounts were refunded prorated. The service officially shut down on August 1, 2026, and teams were advised to migrate before the deadline. No future development roadmap was announced post-shutdown.
Mats Olsen: Co-founder & CTO at Dune. Norwegian, holds an M.Sc. in Applied Mathematics from NTNU. Previously a Senior Data Scientist at Schibsted. Founded Dune in 2018 and leads the core data platform, recently sunsetting the Sim developer platform to refocus on Dune's read layer for onchain data.
Arnaud Simeray: VP of GTM at Dune. Based in Miami, leading enterprise sales for the onchain data platform. Previously built the entire GTM function at Dune, growing revenue 10x, and held VP roles at Tatum and CB4.