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Chaingateway.io offers a variety of API functions that make it easier to work with ERC20 tokens and the Ethereum blockchain in general. There are several functions to send & receive Tokens and Ethereum and to get information like transactions and balances.
Chaingateway.io
ERC20 API & Ethereum API
It's really hard to send ERC20 tokens automated. For that reason I started to develop an API which works with all ERC20 tokens by default. It can send tokens, generate ethereum addresses, get information on all tokens and check ethereum and ERC20 token balances. The only thing needed to work with a specific token is the contract address.
Tokengateway
REST API to send and receive ALL ERC20 tokens and Ethereum