How do I install the Fetch Blocks skill?

Run npx skillmds@latest add erigontech/fetch-blocks in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Fetch Blocks free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Fetch Blocks?

erigontech (@erigontech) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Fetch Blocks by erigontech — Agent Skill

Name: Fetch Blocks
Author: erigontech

File contents

Fetch Ethereum Blocks from RPC URL and Save to Local Directory

Overview

The z6m_prover command with --service option runs a service fetching blocks at the tip or specified range and execute.

Command Syntax

prover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses [other-flags] > temp/mainnet/fetch.log 2>&1

Required Flags

--rpc-url: URL of the RPC server to fetch blocks from (required). Use the $RPC_URL environment variable, which should be configured in .claude/settings.local.json under the env key. If $RPC_URL is not set, ask the user for the URL.

Usage Patterns

Fetch and Execute Blocks at the Tip Until Stopped

prover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses > temp/mainnet/fetch.log 2>&1

Fetch Blocks at the Tip Executing One In Every Million Until Stopped

prover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses --execute-every 1000000 > temp/mainnet/fetch.log 2>&1

Fetch Blocks Range Without Executing

prover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses --start-block 24620000 --end-block 24620199 --execute-every 1000 > temp/mainnet/fetch.log 2>&1

Important Considerations

Fetching Without Executing

When specifying both --start-block and --end-block, you can use a value for --execute-every greater than the block range size to only fetch blocks without ever executing.

Before Running

Ensure z6m_prover binary is built: run make z6m_prover to build it

Workflow

When the user wants to fetch Ethereum blocks and save them to a local directory:

Confirm parameters
- Ask for target RPC URL if not already known from context
Run command

Error Handling

Common issues:

"Failed to get initial block number after retries": Verify the RPC URL is correct

Examples

Example 1: Fetch Blocks at the Tip From Public Reth Until Stopped

prover/target/release/z6m_prover --service --rpc-url $RPC_URL --data-dir temp/mainnet --save-all-responses --execute-every 1000000 > temp/mainnet/fetch.log 2>&1

Example 2: Fetch Blocks Range [24620000, 24620199] Without Executing

prover/target/release/z6m_prover --service --rpc-url $RPC_URL --data-dir temp/mainnet --save-all-responses --start-block 24620000 --end-block 24620199 --execute-every 1000 > temp/mainnet/fetch.log 2>&1

Tips

If building from source, use make z6m_prover within the project home folder to build the binary at prover/target/release/z6m_prover

---name: fetch-blocksdescription: Use to fetch Ethereum mainnet blocks from an RPC URL and save them on a local directory. Use it to acquire blocks for later execution/proving.---# Fetch Ethereum Blocks from RPC URL and Save to Local Directory## OverviewThe `z6m_prover` command with `--service` option runs a service fetching blocks at the tip or specified range and execute.## Command Syntax```bashprover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses [other-flags] > temp/mainnet/fetch.log 2>&1```## Required Flags- `--rpc-url`: URL of the RPC server to fetch blocks from (required). Use the `$RPC_URL` environment variable, which should be configured in `.claude/settings.local.json` under the `env` key. If `$RPC_URL` is not set, ask the user for the URL.## Usage Patterns### Fetch and Execute Blocks at the Tip Until Stopped```bashprover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses > temp/mainnet/fetch.log 2>&1```### Fetch Blocks at the Tip Executing One In Every Million Until Stopped```bashprover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses --execute-every 1000000 > temp/mainnet/fetch.log 2>&1```### Fetch Blocks Range Without Executing```bashprover/target/release/z6m_prover --service --rpc-url <URL> --data-dir temp/mainnet --save-all-responses --start-block 24620000 --end-block 24620199 --execute-every 1000 > temp/mainnet/fetch.log 2>&1```## Important Considerations### Fetching Without ExecutingWhen specifying both `--start-block` and `--end-block`, you can use a value for `--execute-every` greater than the block range size to only fetch blocks without ever executing.### Before Running1. **Ensure z6m_prover binary is built**: run `make z6m_prover` to build it## WorkflowWhen the user wants to fetch Ethereum blocks and save them to a local directory:1. **Confirm parameters** - Ask for target RPC URL if not already known from context2. **Run command**## Error HandlingCommon issues:- **"Failed to get initial block number after retries"**: Verify the RPC URL is correct## Examples### Example 1: Fetch Blocks at the Tip From Public Reth Until Stopped```bashprover/target/release/z6m_prover --service --rpc-url $RPC_URL --data-dir temp/mainnet --save-all-responses --execute-every 1000000 > temp/mainnet/fetch.log 2>&1```### Example 2: Fetch Blocks Range [24620000, 24620199] Without Executing```bashprover/target/release/z6m_prover --service --rpc-url $RPC_URL --data-dir temp/mainnet --save-all-responses --start-block 24620000 --end-block 24620199 --execute-every 1000 > temp/mainnet/fetch.log 2>&1```## Tips- If building from source, use `make z6m_prover` within the project home folder to build the binary at `prover/target/release/z6m_prover`

Frequently asked questions

Fetch Blocks