Feature: Add stablecoin batch payment tools for onchain agent workflows #403

Is your feature request related to a problem? Please describe.

Summary

With the GENIUS Act passed and the Clarity Act approaching finalization, stablecoin payments are becoming a regulated, mainstream payment rail. AI agents built with the Stripe Agent Toolkit can handle fiat payments today — but have no way to batch-send USDC or interact with onchain payment infrastructure.

I'd like to propose adding stablecoin batch payment tools to the toolkit, powered by Spraay — a multi-chain batch payment protocol live on 15 chains with 88 x402-native endpoints.

What this would add

A set of tools that enable Stripe-powered agents to:

• Batch send USDC/ERC-20 tokens to up to 200 recipients in a single transaction
• Batch send native ETH with equal or variable amounts per recipient
• Estimate gas costs before executing batch payments
• Query token balances and prices for onchain assets
  These would complement Stripe's existing fiat tools — agents could use Stripe for card payments and Spraay for stablecoin disbursements within the same workflow.

Use cases

• Crypto payroll: An agent managing payroll could use Stripe for W-2 direct deposits and Spraay for contractor payments in USDC
• Airdrop / rewards distribution: Batch-send tokens to hundreds of wallets in one tx
• DAO treasury operations: Agents managing treasury can batch-pay contributors onchain
• Hybrid fiat + crypto commerce: Accept fiat via Stripe, settle with vendors in stablecoins via Spraay

Prior art

Spraay was recently merged into Google's ADK community tools as the first community-contributed tool in the repo. The implementation includes:

• decimal.Decimal precision for token calculations
• Chain ID verification before transactions
• Gas buffer on all estimate_gas calls
• Comprehensive error handling and docstrings
• Full test suite that runs without web3 installed
  The protocol is live on Base mainnet with a 0.3% protocol fee. Contract: 0x1646452F98E36A3c9Cfc3eDD8868221E207B5eEC

Implementation approach

I'm happy to build this as either:

1. A new provider in tools/python/ and tools/typescript/ alongside existing Stripe tools
2. An example/skill in the skills/ directory showing how to combine Stripe fiat + Spraay crypto in one agent
3. Whatever structure the maintainers prefer
   The Python implementation is already production-tested from the Google ADK integration. TypeScript SDK is also available.

Links

• Spraay Gateway — 88 live endpoints
• Spraay Docs — full API catalog
• MCP Server — 60+ tools on Smithery
• Google ADK PR #95 — merged
• GitHub
  Happy to discuss the best approach for integration. The stablecoin regulatory landscape is moving fast and I think there's a real opportunity to be early on this.

Describe the solution you'd like

No response

Describe alternatives you've considered

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Additional context

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