Cheap blockchain for data-heavy dApps

When building a dApp that requires frequent, high-volume data writes, storing raw data directly in traditional smart contract storage (like Ethereum state storage) is economically unviable, often costing thousands of dollars per megabyte.

The right choice depends heavily on how long you need to store that data and whether it needs to execute smart contract logic alongside the writes.

1. Permanent & Dedicated Storage: Arweave

If your dApp needs data to be stored permanently and immutably with a single upfront payment, Arweave is the industry standard.

• How it works: It uses a "blockweave" structure where miners don't need to store the entire chain history, drastically driving down storage costs.
• Cost: Historically fractions of a cent per megabyte (around $2–$3 per gigabyte, paid once for permanent storage).
• Best for: Large, permanent data payloads like NFTs, immutable audit logs, decentralized permanent web hosting, or historical archiving.

2. High-Frequency State & Execution: Solana

If your dApp needs frequent writes that interact immediately with high-speed program logic (smart contracts) and you need sub-cent transaction fees.

• How it works: Solana treats account data storage via rent-exempt balances. You fund an account's storage based on its size, and that SOL is fully refundable if you close the account later.
• Cost: Transaction fees are typically ≈ $0.00025, making high-volume transactional data writes practical.
• Best for: On-chain order books, gaming state, high-frequency IoT data feeds, or real-time application logs.

3. Temporary Rollup Data Availability: Ethereum L2s (Base, Arbitrum, Optimism using Blobs)

If you need EVM (Ethereum Virtual Machine) compatibility and security anchored to Ethereum, but want to leverage EIP-4844 data blobs.trustwallet.com

• How it works: Layer 2 networks post transaction data to Ethereum via "blobs" rather than expensive standard calldata. These blobs are temporarily available (pruned after ~18 days), which keeps L2 data availability costs very low.
• Cost: Significantly cheaper than Ethereum L1, though more expensive per raw megabyte than Solana or Arweave.
• Best for: dApps requiring standard EVM tooling where data only needs to be verified/available for a short window rather than eternity.trustwallet.com

Quick Comparison Matrix

To help narrow down the ideal network, could you share:

• Roughly how many megabytes or gigabytes of data you expect to write per day?
• Does the data need to be permanently immutable , or is a temporary rolling window (e.g., 30 days) acceptable?
• Do you require EVM (Solidity) compatibility?

For a dApp with frequent, high-volume on-chain writes, the most cost-effective choice depends on whether you need data permanently stored in smart-contract state or simply recorded on-chain. Those are very different workloads, and choosing the right storage model can save substantially more than switching chains alone.

My initial recommendation is to evaluate Solana for frequently updated application state, and consider a dedicated data-availability or decentralized storage network if your workload is primarily bulk data. Solana supports arbitrary program-defined account data, although its storage model requires a refundable deposit proportional to account size.solana.com+1

Best options by storage workload

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1. Solana — frequent application-state writes

Best starting point if your dApp needs fast transactions and state that smart contracts can read and modify. Account storage requires a refundable deposit, so large persistent datasets still have a capital cost.solana.com+1

Best for: live app state, user records, frequent updates.

Storage documentation

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2. Aptos — persistent state with storage refunds

Worth benchmarking if your application creates and deletes many state entries. Aptos charges storage fees for persistent data and documents full refunds of storage fees when a state slot is deleted under its current configuration.aptos.dev

Best for: structured application state and workloads with storage churn.

Gas and storage fees

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3. Celestia — bulk data publication

Designed for publishing data blobs with fees that scale with blob size. It is a strong candidate when you need data availability for a rollup or app-specific chain, but it does not replace an execution chain for directly readable, mutable smart-contract state.docs.celestia.org+2

Best for: high-volume data availability, rollup transaction data.

Blobspace pricing

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4. Filecoin — large datasets at low recurring cost

Better suited to storing files, historical records, and other bulk data than putting every byte in smart-contract state. Filecoin advertises storage options starting at $2.50 per TiB per month for its Onchain Cloud storage service, with additional terms and fees to consider.docs.filecoin.cloud+1

Best for: files, archives, datasets, off-chain content.

Storage options and pricing

Why the storage model matters

Ethereum's own documentation illustrates the cost gap: a new 32-byte persistent storage slot can cost 22,100 gas, while transaction calldata and event logs are cheaper ways to record data that does not need to remain directly readable as contract state. The dollar figures on that page are illustrative, not live quotes.ethereum.org+1

A practical architecture is often a hybrid:

• Mutable, essential state: Solana or Aptos.
• Bulk transaction data: Celestia, where data availability meets your requirements.
• Files and long-term archives: Filecoin or another decentralized storage system.
• On-chain verification: Store hashes, content identifiers, or commitments on the execution chain.

One question to narrow it down

When you say “on-chain data writes,” which type best describes your dApp?

1. What are you writing?

Mutable smart-contract state (balances, records, app state)

Append-only records, logs, or transaction history

Large data blobs, files, or datasets

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2. What is your expected write volume?

Hundreds to thousands of writes per minute

Thousands to millions of writes per second

High total volume, but writes can be batched

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3. Do you need EVM compatibility?

Yes, Solidity / EVM required

No, any smart-contract platform is acceptable

Flexible

[Compare the best-fit networks]

With those details, I can narrow this down to a realistic cost comparison instead of ranking networks solely by headline transaction fees.