Powered by @dune. Realtime, multichain end-to-end developer platform. APIs and Indexing across 60+ chains.
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🛠️ HyperEVM is LIVE on Sim API!
Build wallets, portfolio trackers, or AI agents? Access realtime @HyperliquidX HyperEVM token balances & transaction feeds for FREE 👇🔥
Start building: sim.dune.com/
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gm, Sim is now live!
Powered by @Dune, a realtime, multichain developer platform designed to power the next generation of onchain apps.
Get started today sim.dune.com
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Why we built Sim, a letter from @Dune's CTO 💌
dune.com/blog/introducing-si…
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👀 WE HEARD YOU LOVE SOME CT DRAMA! 🍵
🔍 We caught degens in 4K:
🔹 Desperate traders BEGGING for refunds 🥺
🔹 Pretending to be US police 👮♂️
🔹 Cryptic love letters ... 💌
All real. All on-chain. All bizarre.
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Every DeFi app, NFT marketplace, and onchain apps relies on one unsung hero: INDEXERS.
Our new guide tears open the black box of blockchain data pipelines.
See what makes an indexer unique 👇
dune.com/blog/the-state-of-e…
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Indexing doesn’t have to be hard 👇
@Uniswap X is one of DeFi's toughest protocols to index. Most indexers can't handle it. Yet Sim IDX turns it into a few lines of Solidity.
Here's how 🧵:
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gMonday.
Today's a good day to start building on Sim. Here's a guide on how to build a realtime wallet with Sim
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60+ chains in one unified API call.
If you're building multi-chain, save your devs team by switching to Sim 💙
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Expand your realtime crypto wallet by integrating a dynamic feed of onchain activity.
Learn how to add Account Activity to your wallet with Sim 👇
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Discover how @spell_club scaled data access for 8.5M+ users across 60+ chains with @Dune Sim API.
✅ Balances load in <200ms (from 1.6s!)
✅ Cut backend complexity by 20%
"We now focus on building gamified experiences, not managing fragmented data." – Yevhen, CTO at Spell
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🔦 Onchain Indexing Struggles #1/N
"Getting reliable historical data for new or unsupported chains feels impossible." – Core dev, DeFi protocol
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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Sim <> @farcaster_xyz wallet
Learn about how we helped their team to build a transaction-first future for social crypto users sim.dune.com/case-study
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Sim IDX is now LIVE.
Build apps faster with IDX 👇
🔛🔛🔛🔛 Sim init Web3 Devs 🔛🔛🔛🔛
Introducing @DuneSim Sim IDX, the end-to-end multichain indexing layer for onchain apps.
❇️ Super-Fast Backfills
❇️ Solidity-native enrichment
❇️ Zero DevOps
❇️ Streaming and historical
Are you ready to change the game?
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"It is surprisingly fair."
Yes, we did not put this guide together to make biased marketing claims. We know devs don't like that.
With help from @pool_two @sui414 @dabit3 @johnnatan_me @kanishkkhurana @leichain @andrewhong5297 @billyjitsu @fedesarquis & others, this is a collaborative effort to bring more clarity, guidance, and shed more light into the onchain indexing industry.
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Want to build faster with Sim APIs using LLMs? Here's how:
✅ AI Search
✅ Complete Documentation for LLMs
✅ Cursor Integration
✅ OpenAPI Specifications
Read more in the docs docs.sim.dune.com/build-with…
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There's no 'best' onchain indexer.
The right solution depends on:
✅ Realtime latency needs
✅ Historical backfill depth
✅ Cross-chain complexity
✅ Cost/SLA considerations
We mapped 7 solutions + tradeoffs in this guide →
dune.com/blog/the-state-of-e…
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Do you experience issues displaying tokens that aren’t in the top 3,000 market cap? You are not alone 🫂
@dynamic_xyz recently integrated with Sim API which simplified token balance retrieval while expanding token coverage.
Check out how they did it👇
sim.dune.com/case-studies/dy…
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MEET YOUR NEW CRYPTO X-RAY 👇 Powered by Sim IDX – dropping tomorrow!
Try finding the next weirdest message onchain👻
Play with the app LIVE: sim-idx-onchain-message-expl…
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What kind of data do you need when building an app?
1️⃣ Account data (e.g., balances, transfer history)
2️⃣ Asset data (e.g., token prices, metadata)
3️⃣ Protocol data (e.g., contract events, financial state)
Learn how to index different levels of data 👇
dune.com/blog/the-state-of-e…
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🚨 Developers on @b3dotfun
Did you know there's a faster and better way to build your app?
B3 is now supported by Sim API, with fast, reliable, and access to 60+ other blockchains.
Get onchain prices, metadata, and activity feeds — pre-enriched for your app.
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What do you need to consider when choosing an onchain indexer? 🧐
We broke down this question one-by-one in our latest indexing guide
Read more 👇
dune.com/blog/the-state-of-e…
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🙊 SECRETS DON'T EXIST ON L1-L2s
Your "private" wallet chats? Public records. 👁️
We scanned 12 chains to expose the weirdest convos degens try to hide.
Pro tip: If you wouldn’t yell it in Times Square, don’t put it onchain.
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🔦 Onchain Indexing Struggles #2/N
"Indexing speed is too slow, forcing direct contract reads for realtime needs." – Backend dev, Perp Dex
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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Sim is not just for wallets! get creative devs 🎨🎨
Who said @aigentdotrun agents will be limited to XRPL data sources? Thanks to @Dune data and the power of MCP technology, you will have access to EVM chain & Solana balances, transaction history, token data and more. All from our native terminal!
Blockchain will be multichain. So should be your AI agents.
Big thanks to @DennisonBertram for sharing this powerful MCP server with the community.
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Why Dune Built Sim IDX 👀 Spoiler: We reversed the flow.
Instead of pulling data AFTER execution, Sim embeds indexing logic INSIDE a custom iEVM.
✅ Result: Parallel backfills + sub-second latency.
Onchain Indexing Architecture Deep Dive ↓
dune.com/blog/the-state-of-e…
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⏰
Over the past two weeks, we've spoken with 50+ Devs and DevRels to understand their biggest challenges with onchain indexing 🤔🛠️
Starting on Monday, we'll share some of these insights on @DuneSim.
Join us on our journey to make the onchain developer experience better!
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🔦 Onchain Indexing Struggles #5/N
"The lack of version-controlled schemas forces painful full re-indexes on upgrades."– DevOps Engineer, DAO Governance Project
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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Traditional RPC-based indexing logic
VS
Sim IDX
We've built a custom EVM that reverses the typical flow–processing relevant blocks as they execute rather than after the fact.
Learn more 👇
dune.com/blog/the-state-of-e…
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Welcome first class Sim citizens 👋🏻
Got upgraded on my flight to NYC this morning and everyone in first class was building onchain apps with @DuneSim API and IDX.
I looked back at the rest of the plane - everyone building with RPCs, subgraphs and super slow providers.
Just a very interesting observation.
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🔦 Onchain Indexing Struggles #9/N
"The cost versus reliability ratio of some indexing services is disappointingly poor."– CTO, Pre-Seed Web3 Project
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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The fastest and most accurate API for your app!
At Axal, speed is everything. Fast, reliable data about Axal performance available 24/7 on @Dune.
Tag @DuneSim separately for the single best token and balance data. Currently live on @Base, with @0xPolygon, @Ethereum Mainnet, @HyperliquidX, etc on the way!
Stoked to be partnering with such an amazing team.
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🔦 Onchain Indexing Struggles #4/N
"Latency issues make most indexers unusable for realtime DeFi apps."– Head of Engineer, DeFi Protocol
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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🔦 Onchain Indexing Struggles #7/N
"Paid indexer services failing to meet promised SLAs for lag is deeply frustrating." – Solutions Architect, top defi app
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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🔦 Onchain Indexing Struggles #8/N
"Maintaining custom infrastructure just to get real-time data feels like a failure of existing tools."– Site Reliability Engineer (SRE), Crypto Exchange
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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🔦 Onchain Indexing Struggles #10/N
"Most indexers don't give me access to contract classification or lower-level triggers and context " – Full-Stack Developer, Lending Protocol
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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🔦 Onchain Indexing Struggles #3/N
"Keeping up with user-deployed contracts dynamically is a major pain point." – Lead Smart Contract Dev
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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🔦 Onchain Indexing Struggles #6/N
"Indexers falling significantly behind the chain tip is a common and frustrating issue." – Backend Developer, L1 chain
💬 Sound familiar?
⬇️ Drop your experience below 👇
🔁 RT if devs deserve better tools!
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📖 Full case study → sim.dune.com/case-studies/sp…
🔑 Start free with 100K monthly requests → sim.dune.com/api
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From a sophisticated, gas-optimized protocol to a simple, queryable API, all orchestrated through onchain logic.
Want the full technical walkthrough? Check our documentation for complete implementation examples and source code.
docs.sim.dune.com/idx/guides…
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5/ Instead of re-implementing @Uniswap X's decoding logic, as offchain indexers do, we ask the reactor to decode for us.
Sim IDX's Quoter Pattern calls the protocol directly, using it as an on-demand oracle. This is something off-chain indexers can't do.
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⁉️ We use wallets daily, but how much do you know about them?
👉 New 70-page Report — Crypto Wallets 2025: An Anthology
💳 20+ wallets, data across 100+ chains
📔 From tech-stack to adoption data, we cover it all
㊙️ Secret bonus at the end
Download: dune.com/crypto-wallets
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3/ Sim IDX solves it at the root with an onchain approach.
You deploy your indexer as a live onchain smart contract.
This means you can simulate onchain interactions with @Uniswap X's contracts from within the indexer itself. The protocol can interact with your indexer too!
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2/ @Uniswap X uses reactor contracts to handle its sophisticated order execution logic. The problem is that swap details aren't exposed in standard logs or event traces, and most off-chain indexers rely upon logs to get their data.
UniswapX data lives deep inside contract logic, not events.
Offchain indexers get stuck trying to reconstruct every reactor's logic. This means endless decoding, manual upgrades every time the protocol changes, and brittle pipelines that don't scale.
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This guide is a collaborative effort with:
@pool_two, @berachain
@sui414, @ Flashbots
@dabit3, @eigencloud
@johnnatan_me, @mpi_sws
@kanishkkhurana, @AcrossProtocol
@leichain, @UMAprotocol
@andrewhong5297, @herd_eco
@billyjitsu, @Api3DAO
@fedesarquis, @crossmint
and others.
Together, the top devs aim to bring clarity, guidance, and insight into the complex onchain indexing industry.
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This guide is a collaborative effort with:
@pool_two, @berachain
@sui414, @ Flashbots
@dabit3, @eigencloud
@johnnatan_me, @mpi_sws
@kanishkkhurana, @AcrossProtocol
@leichain, @UMAprotocol
@andrewhong5297, @herd_eco
@billyjitsu, @Api3DAO
@fedesarquis, @crossmint
and others.
Together, the top devs aim to bring clarity, guidance, and insight into the complex onchain indexing industry.
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4/ Most indexing solutions require maintaining endless contract address lists.
Sim IDX uses ABI-based triggers that automatically pick up any contract implementing the reactor interfaces that @Uniswap X uses.
Adapting to updates and new reactor types just works because the underlying contracts implement the same interface.
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This guide is a collaborative effort with:
@pool_two, @berachain
@sui414, @ Flashbots
@dabit3, @eigencloud
@johnnatan_me, @mpi_sws
@kanishkkhurana, @AcrossProtocol
@leichain, @UMAprotocol
@andrewhong5297, @herd_eco
@billyjitsu, @Api3DAO
@fedesarquis, @crossmint
and others.
Together, the top devs aim to bring clarity, guidance, and insight into the complex onchain indexing industry.
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7/ Your Solidity event definition becomes your queryable API schema. Sim IDX generates the full database and schema without mapping or translation.
You focus only on Solidity rather than struggling with various technologies.
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6/ The onchain listener doesn't just decode, it enriches the data. It injects protocol fees for accuracy, calls token contracts for metadata, and assembles complete records.
Everything validated by the protocol itself.
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This guide is a collaborative effort with:
@pool_two, @berachain
@sui414, @ Flashbots
@dabit3, @eigencloud
@johnnatan_me, @mpi_sws
@kanishkkhurana, @AcrossProtocol
@leichain, @UMAprotocol
@andrewhong5297, @herd_eco
@billyjitsu, @Api3DAO
@fedesarquis, @crossmint
and others.
Together, the top devs aim to bring clarity, guidance, and insight into the complex onchain indexing industry.
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This guide is a collaborative effort with:
@pool_two, @berachain
@sui414, @ Flashbots
@dabit3, @eigencloud
@johnnatan_me, @mpi_sws
@kanishkkhurana, @AcrossProtocol
@leichain, @UMAprotocol
@andrewhong5297, @herd_eco
@billyjitsu, @Api3DAO
@fedesarquis, @crossmint
and others.
Together, the top devs aim to bring clarity, guidance, and insight into the complex onchain indexing industry.
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📖 Full case study → sim.dune.com/case-studies/sp…
🔑 Start free with 100K monthly requests → sim.dune.com/api
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