# XMTP App Chain RPC API

**Canonical:** https://apis.io/apis/xmtp/xmtp-app-chain-rpc-api/  
**Provider:** XMTP — https://apis.io/providers/xmtp/  
**Base URL:** https://xmtp-mainnet.g.alchemy.com/v2  
**Documentation:** https://www.alchemy.com/docs/reference/xmtp-api-quickstart

XMTP App Chain RPC API is one of 7 APIs that [XMTP](https://apis.io/providers/xmtp/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include JSON-RPC, Blockchain, Ethereum, Layer-3, and Smart Contracts. The published artifact set on APIs.io includes API documentation, a getting-started guide, and rate-limit docs.

JSON-RPC API for the XMTP Layer-3 appchain built on Arbitrum and settling to Base. Used for smart contract interactions including group management, identity updates, node registration, and fee payments in USDC. Compatible with standard Ethereum JSON-RPC tooling via providers like Alchemy. Chain ID 2020 with ETH as native currency.

## Machine-readable artifacts (5)

- **Documentation** — https://www.alchemy.com/docs/reference/xmtp-api-quickstart
- **GettingStarted** — https://www.alchemy.com/docs/reference/xmtp-api-quickstart
- **Plans** — https://xmtp.org/xmtp/plans.yml
- **RateLimits** — https://xmtp.org/xmtp/rate-limits.yml
- **FinOps** — https://xmtp.org/xmtp/finops.yml

## Other XMTP APIs (6)

- [XMTP Network gRPC API](https://apis.io/apis/xmtp/xmtp-network-grpc-api/)
- [XMTP JavaScript/TypeScript SDK](https://apis.io/apis/xmtp/xmtp-javascripttypescript-sdk/)
- [XMTP Agent SDK](https://apis.io/apis/xmtp/xmtp-agent-sdk/)
- [XMTP Android SDK](https://apis.io/apis/xmtp/xmtp-android-sdk/)
- [XMTP iOS SDK](https://apis.io/apis/xmtp/xmtp-ios-sdk/)
- [XMTP React Native SDK](https://apis.io/apis/xmtp/xmtp-react-native-sdk/)

## Tags

JSON-RPC, Blockchain, Ethereum, Layer-3, Smart Contracts

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/xmtp/xmtp-app-chain-rpc-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/xmtp/.