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Mesc

MESC is a specification and set of reference implementations for sharing RPC endpoint configuration across crypto tools. Its JSON format can store endpoint names, chain IDs, URLs and default endpoints, allowing compatible tools to read common settings.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Mesc — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use MESC when building or using a crypto tool that implements the standard and you want RPC settings shared across tools, languages or environments.

Who it is for

  • Developers integrating shared RPC endpoint configuration into crypto tools.
  • Users managing RPC endpoint settings for multiple tools that support MESC.

Documented uses

  • Keep endpoint details for multiple networks in one JSON configuration.
  • Resolve an RPC selection by endpoint name, chain ID or network name in an integrating tool.
  • Set up a MESC configuration using the interactive CLI.
Before you choose

Requirements & limits

  • MESC is a standard; a tool must implement it to consume the shared configuration.
  • The configuration is stored as JSON and can be identified through the MESC_PATH environment variable.
  • Reference implementations are listed for CLI, Python and Rust; Go and TypeScript are marked as works in progress.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Set up a MESC configuration with the CLI

Create a MESC JSON configuration through the interactive setup flow and identify it with the MESC_PATH environment variable.

Before you start

  • Cargo to install the mesc_cli package.
  • On some Linux distributions, pkg-config and SSL development libraries may be needed.

Steps

  1. Install the CLI with the command below.

    Documented command
    cargo install mesc_cli

  2. Run mesc setup for interactive setup.

Expected outcome

A MESC configuration can be created through the CLI setup flow; MESC_PATH identifies the configuration file path for tools using the standard.

Guide limitations

  • The documentation notes that some Linux distributions may require additional SSL libraries and pkg-config.
  • This setup does not by itself add MESC support to crypto tools; tools need an implementation.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
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14 October 2026
Original website title
paradigmxyz/mesc · Official homepage title · retained in its source language
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