[Plugin] Spraay — Batch payments for AI agents on Base

[plagtech]

## Spraay Plugin

Enables GAME agents to batch-send ETH and ERC-20 tokens to up to 200 recipients in a single transaction on Base.

### Functions
- `spraay_batch_eth` / `spraay_batch_eth_equal` — Batch ETH sends
- `spraay_batch_erc20` / `spraay_batch_erc20_equal` — Batch token sends  
- `spraay_check_balance` — Pre-flight balance check
- `spraay_estimate_cost` — Cost estimation with fees

### Details
- Contract: [0x1646452F98E36A3c9Cfc3eDD8868221E207B5eEC](https://basescan.org/address/0x1646452F98E36A3c9Cfc3eDD8868221E207B5eEC) (verified)
- ~80% gas savings vs individual transfers
- 0.3% protocol fee
- Supports USDC, DAI, WETH, cbETH, USDbC + any ERC-20
- OpenZeppelin ReentrancyGuard + Pausable

### Links
- Website: https://spraay.app
- Standalone repo: https://github.com/plagtech/spraay-game-plugin

[plagtech]

Hey team 👋 Friendly bump on this PR. Spraay has continued to ship since submitting — we're now live on 7 chains (Base, Arbitrum, Unichain, Plasma, BOB, Bittensor, Kite AI), officially listed in the Coinbase x402 ecosystem (merged PR #1278), and distributed across 9+ MCP server directories. We also have a live x402 payment gateway at gateway.spraay.app serving AI agents.
Happy to address any feedback or make changes if needed. Would love to get batch payments available for GAME agents.

[plagtech]

Update — March 2026

Spraay x402 Gateway has expanded significantly since this PR was opened:

62 paid endpoints across 8 categories (up from 6):

• AI Chat (200+ models via OpenRouter)
• Batch Payments (200 recipients/tx)
• DeFi (Uniswap V3 swaps)
• Price Oracle / Gas / FX
• Cross-chain Bridge (11 chains)
• Payroll, Invoicing, Escrow
• Wallet Analytics, AI Inference
• NEW: GPU/Compute — image gen, video, LLMs, audio via Replicate ($0.05/call)
• NEW: Search/RAG — web search, content extraction, Q&A via Tavily ($0.01-$0.02/call)
• Communication (email, SMS, webhooks, XMTP)
• Infrastructure (RPC, IPFS, cron, logging)
• Identity (KYC, auth/SSO)
• Compliance (audit trail, tax)

63-tool MCP server on Smithery: @plagtech/spraay-x402-mcp
Developer docs: https://docs.spraay.app
Gateway: https://gateway.spraay.app

All endpoints are x402-native — agents pay USDC per request on Base. No API keys, no accounts.