Dune is retiring the SIM API on August 1, 2026. If your app uses SIM for wallet balances, transaction history, or DeFi positions, you need a replacement before that date.

Allium's Real-time API covers the same endpoints. 23 chains. Full data lineage on every response.

Here's how to migrate.

What Allium's Real-time API covers

SIM was built around four core data types. Allium covers all of them:

Step-by-step migration process

Step 1: Get your API key

Sign up at app.allium.so. API keys are self-serve.

Step 2: Update authentication

SIM used an API key in the X-Sim-Api-Key header. Allium uses X-API-KEY.

Before (SIM):

curl https://api.sim.dune.com/v1/evm/balances/0xYOUR_ADDRESS \
  -H "X-Sim-Api-Key: YOUR_SIM_KEY"

After (Allium):

curl -X POST https://api.allium.so/api/v1/developer/wallet/balances \
  -H "X-API-KEY: YOUR_ALLIUM_KEY" \
  -H "Content-Type: application/json" \
  -d '[{"chain": "ethereum", "address": "0xYOUR_ADDRESS"}]'

Step 3: Update chain identifiers

SIM used numeric chain IDs. Allium uses string slugs.

Step 4: Remap transaction history

Before (SIM):

curl https://api.sim.dune.com/v1/evm/transactions/0xYOUR_ADDRESS \
  -H "X-Sim-Api-Key: YOUR_SIM_KEY"

After (Allium):

curl -X POST https://api.allium.so/api/v1/developer/wallet/transactions \
  -H "X-API-KEY: YOUR_ALLIUM_KEY" \
  -H "Content-Type: application/json" \
  -d '[{"chain": "ethereum", "address": "0xYOUR_ADDRESS"}]'

Allium returns enriched activity labels (swap, transfer, bridge, etc.) on each transaction. No post-processing required.

Step 5: Remap DeFi positions

Before (SIM):

curl https://api.sim.dune.com/v1/evm/portfolio/0xYOUR_ADDRESS \
  -H "X-Sim-Api-Key: YOUR_SIM_KEY"

After (Allium):

curl -X POST https://api.allium.so/api/v1/developer/wallet/positions \
  -H "X-API-KEY: YOUR_ALLIUM_KEY" \
  -H "Content-Type: application/json" \
  -d '[{"chain": "ethereum", "address": "0xYOUR_ADDRESS"}]'

Allium fetches positions across all supported chains by default. You don't specify chains individually.

Step 6: Update pagination

SIM used cursor-based pagination with a next_offset field. Allium uses a cursor field with a next_cursor in the response.

SIM:

?limit=100&offset=YOUR_NEXT_OFFSET

Allium:

?limit=100&cursor=YOUR_NEXT_CURSOR

Why Allium

• 23 chains. SIM covered 14 EVM chains by default. Allium's Real-time API covers 23 chains including Solana, Bitcoin, Near, and Stellar, with no per-chain configuration required.
• Auditable data. Allium deviates 0.000011% from ground truth node data. Full lineage included.
• Built for scale. ~100K RPS with a 99.9% uptime SLA.
• SOC 2 certified. Required for teams with institutional or compliance requirements.
• Multiple delivery options. Start with the REST API. Add streaming, SQL, or warehouse delivery as you scale.
• Flat pricing. No compute units or credit caps. Predictable cost as volume grows.

Who's already using Allium

The teams already running on Allium's Real-time API span wallets, DeFi, and trading infrastructure:

• MetaMask uses the fungible balances and wallet transactions endpoints to power their wallet product.
• Fun.xyz runs wallet APIs across Solana, Ethereum, Base, and Arbitrum for their multi-chain wallet experience.
• Uniswap uses DeFi positions, wallet balances, and PnL endpoints.
• Fomo uses real-time APIs to power cross-chain trading
• MoonPay uses real-time APIs for payment verification

Get started

• Docs: docs.allium.so/api/overview
• API key: app.allium.so
• Questions: [email protected]
• Talk to use about your specific use case: https://www.allium.so/contact

The SIM deprecation deadline is August 1, 2026. Start the migration now.