Python: feat: Add Spraay batch payment plugin for Base (Python)

[plagtech]

Feature Request

I'd like to contribute a Spraay batch payment plugin for the Python SDK, enabling SK agents to batch-send ETH or ERC-20 tokens to up to 200 recipients in a single transaction on Base.

Why

Batch payments are a common onchain operation for DAOs, teams, and AI agents — payroll, airdrops, bounties, and reward distributions. As AI agents increasingly handle financial operations, having a native plugin for efficient batch payments enables Semantic Kernel developers to build payment automation without deep blockchain expertise.

What

A SpraayBatchPaymentPlugin class with four @kernel_function methods:

Function	Description
batch_eth	Send equal ETH to multiple recipients
batch_eth_variable	Send variable ETH amounts per recipient
batch_token	Send equal ERC-20 tokens to multiple recipients
batch_token_variable	Send variable token amounts per recipient

Features:

• Up to 200 recipients per transaction
• ~80% gas savings vs individual transfers
• Automatic ERC-20 token approval handling
• Chain ID verification, 10% gas buffer
• All parameters use Annotated type hints for LLM function calling
• Environment-based config (RPC URL, private key)

Protocol: Spraay — Contract 0x1646452F98E36A3c9Cfc3eDD8868221E207B5eEC on Base Mainnet.

Prior art: This tool has already been merged into Google ADK and published as a Strands Agents extension.

I have a working implementation with unit tests ready to submit as a PR. Happy to discuss the best location in the repo and any design feedback before opening the PR.