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skills: The eth_blobBaseFee JSON-RPC endpoint is now exposed on Sei but returns a JSON-RPC error (code -32000, "blobs not supported on this chain") since Sei does not support EIP-4844 blob transactions. (sei-protocol/sei-chain#3080) #14

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skills: The eth_blobBaseFee JSON-RPC endpoint is now exposed on Sei but returns a JSON-RPC error (code -32000, "blobs not supported on this chain") since Sei does not support EIP-4844 blob transactions. (sei-protocol/sei-chain#3080) #14

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2 changes: 1 addition & 1 deletion skill/references/evm/overview.md
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Expand Up @@ -35,7 +35,7 @@ description: How Sei's EVM differs from Ethereum — opcodes, gas model, finalit
| `BLOCKHASH` | Hash of Tendermint header | Keccak of Ethereum block header | Different encoding; usable for recent blocks |
| `GASLIMIT` | 12,500,000 | 60,000,000 | Block gas limit |
| `TIMESTAMP` | Tendermint block time | Proposer-chosen block time | Do not use as randomness source |
| Blob opcodes | Not supported | Supported (post-Cancun) | No EIP-4844 blob transactions on Sei |
| Blob opcodes | Not supported | Supported (post-Cancun) | No EIP-4844 blob transactions on Sei. `eth_blobBaseFee` is exposed but returns JSON-RPC error -32000 ("blobs not supported on this chain"), not -32601 method-not-found |

## Key Developer Rules

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12 changes: 12 additions & 0 deletions skill/references/migration/from-ethereum.md
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Expand Up @@ -77,6 +77,18 @@ address proposer = block.coinbase;

Sei runs Pectra EVM but without blob transactions (`BLOBHASH` / `BLOBBASEFEE`). If your contract uses blobs, you need to refactor.

The `eth_blobBaseFee` JSON-RPC endpoint **is** exposed, but it deliberately returns a JSON-RPC error instead of a fee value — do not expect a usable blob base fee:

```json
// Request
{"jsonrpc":"2.0","id":1,"method":"eth_blobBaseFee"}

// Response
{"jsonrpc":"2.0","id":1,"error":{"code":-32000,"message":"blobs not supported on this chain"}}
```

Migrating apps that call `eth_blobBaseFee` must handle the `-32000` "blobs not supported on this chain" error rather than parsing a returned fee.

### 6. SSTORE Costs Are Higher Than Ethereum

Storage writes are far costlier than Ethereum's 20,000 gas:
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