> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blockscout.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Archive

Blockscout previously used optional API Keys and per-instance routes. The archive includes REST, JSON RPC and other previous information. If you are using these per-instance routes please update to the PRO API.

1. [**REST API**](/devs/apis/rest): API that serves the UI for Blockscout.
2. [**RPC API**](/devs/apis/rpc): provided for developers transitioning applications from Etherscan to Blockscout. Supports GET and POST requests, simply replace Etherscan url with Blockscout url to use the RPC.
3. [**Eth RPC API**](/devs/apis/rpc/eth-rpc): Supports the most popular [JSON RPC methods](https://ethereum.github.io/execution-apis/api-documentation/).
4. [**GraphiQL**](https://github.com/graphql/graphiql): An IDE for exploring GraphQL.
5. [Contract Verification API](/devs/verification/blockscout-smart-contract-verification-api): Prior Verifcation API info. Verification API is available with the PRO API.
6. [TEST Merits API](/devs/integrate-merits): Developed for prior hackathons