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+---
+eip: TBD
+title: Precise Gas Estimation with eth_necessaryGas
+description: A new RPC method that returns the minimum required gas for transaction execution
+author: @wjmelements <https://github.com/wjmelements>
+discussions-to: https://github.com/ethereum/go-ethereum/pull/29727
+status: Draft
+type: Standards Track
+category: Interface
+created: 2024-12-09
+requires: 1474, 2930
+---
+
+## Abstract
+
+This EIP introduces a new JSON-RPC method `eth_necessaryGas` that returns the minimum gas limit required for a transaction to execute successfully. Unlike `eth_estimateGas`, this method guarantees the returned value is the lowest possible gas limit that ensures transaction success, providing more precise gas estimation.
+
+## Motivation
+
+The existing `eth_estimateGas` method often returns conservative estimates that may be significantly higher than necessary. This leads to:
+1. Users overpaying for gas
+2. Transactions consuming more of the block gas limit than needed
+3. Difficulty in optimizing gas usage in smart contracts
+
+This new method addresses these issues by returning the exact minimum gas required for successful execution.
+
+## Specification
+
+### JSON-RPC Method Definition
+
+#### eth_necessaryGas
+
+Returns the minimum gas limit required for a transaction to execute successfully.
+
+##### Parameters
+
+1. `Object` - The transaction call object
+    - `from`: `DATA`, 20 Bytes - (optional) The address the transaction is sent from
+    - `to`: `DATA`, 20 Bytes - The address the transaction is directed to
+    - `gas`: `QUANTITY` - (optional) Integer of the maximum gas limit provided for the estimation. Must be greater than minimum transaction gas (21000). Server will cap returned value to this amount if specified.
+    - `gasPrice`: `QUANTITY` - (optional) Integer of the gas price used for each paid gas
+    - `maxFeePerGas`: `QUANTITY` - (optional) Maximum total fee per gas the sender is willing to pay (includes the priority fee)
+    - `maxPriorityFeePerGas`: `QUANTITY` - (optional) Maximum priority fee per gas the sender is willing to pay
+    - `value`: `QUANTITY` - (optional) Integer of the value sent with this transaction
+    - `data`: `DATA` - (optional) Hash of the method signature and encoded parameters
+    - `nonce`: `QUANTITY` - (optional) Integer of a nonce
+
+2. `QUANTITY|TAG|OBJECT` - (optional) Integer block number, or the string "latest", "earliest" or "pending", or block hash object as defined in EIP-1898
+
+##### Returns
+
+`QUANTITY` - The minimum gas limit required for successful transaction execution.
+
+##### Example
+
+Request:
+```json
+{
+  "id": 1,
+  "jsonrpc": "2.0",
+  "method": "eth_necessaryGas",
+  "params": [
+    {
+      "from": "0x8D97689C9818892B700e27F316cc3E41e17fBeb9",
+      "to": "0x3535353535353535353535353535353535353535",
+      "data": "0x6060604052341561000f57600080fd5b60"
+    },
+    "latest"
+  ]
+}
+```
+
+Response:
+```json
+{
+  "id": 1,
+  "jsonrpc": "2.0",
+  "result": "0x5208" // 21000 in hex
+}
+```
+
+##### Error Codes
+
+- `-32000`: Invalid input or execution error
+- `-32001`: Transaction would revert
+- `-32002`: Block not found
+- `-32003`: Gas estimation exceeds configured cap
+
+### Implementation Requirements
+
+1. The method MUST return the exact minimum gas required for successful execution
+2. The method MUST return an error if the transaction would revert
+3. The method MUST cap the returned value by:
+   - The `gas` parameter in the transaction object (if specified and non-zero)
+   - The node's configured RPC gas cap (if non-zero)
+4. The method MUST NOT include blob gas calculations in the returned value
+5. The method MUST support all block specifiers as defined in EIP-1898
+6. The method MUST execute the transaction in a temporary state to determine gas usage
+
+### Security Considerations
+
+1. Nodes should implement appropriate rate limiting to prevent DoS attacks
+2. Gas estimation may be computationally intensive for complex contracts
+3. The returned value should be treated as valid only for the specified block
+4. Users should still include a safety margin when setting gas limits
+
+### Backwards Compatibility
+
+This EIP introduces a new method and does not modify existing functionality. No backwards compatibility issues are present.
+
+## Rationale
+
+The name `eth_necessaryGas` was chosen to differentiate it from `eth_estimateGas` and to emphasize its purpose of returning the exact minimum required gas. The method is designed to be compatible with existing transaction formats and block specifiers.
+
+The decision to exclude blob gas calculations aligns with the separation of concerns principle and allows for cleaner integration with EIP-4844.
+
+## Reference Implementation
+
+```go
+// NecessaryGas returns the lowest gas limit that allows the transaction to run
+// successfully at block `blockNrOrHash`, or the latest block if `blockNrOrHash` is unspecified.
+func (s *PublicBlockChainAPI) NecessaryGas(ctx context.Context, args TransactionArgs, blockNrOrHash *rpc.BlockNumberOrHash) (hexutil.Uint64, error) {
+    bNrOrHash := rpc.BlockNumberOrHashWithNumber(rpc.LatestBlockNumber)
+    if blockNrOrHash != nil {
+        bNrOrHash = *blockNrOrHash
+    }
+    
+    state, header, err := s.b.StateAndHeaderByNumberOrHash(ctx, bNrOrHash)
+    if err != nil {
+        return 0, err
+    }
+    
+    // Cap gas limit if requested
+    if args.Gas != nil && uint64(*args.Gas) != 0 {
+        if uint64(*args.Gas) < params.TxGas {
+            return 0, fmt.Errorf("gas limit cannot be lower than %d", params.TxGas)
+        }
+    }
+    
+    // Execute transaction with binary search for exact gas limit
+    result, err := s.findExactGasLimit(ctx, args, state, header)
+    if err != nil {
+        return 0, err
+    }
+    
+    return hexutil.Uint64(result), nil
+}
+```
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).