feat: add Spraay x402 Gateway to Developer Tools

[plagtech]

Adds Spraay x402 Gateway to the Developer Tools section.
Spraay x402 Gateway — full-stack pay-per-call crypto infrastructure for AI agents. 88+ x402 endpoints across 19 categories. USDC on Base via Coinbase x402 facilitator. 15-chain coverage.

• Gateway: https://gateway.spraay.app/
• Docs: https://docs.spraay.app/
• MCP: @plagtech/spraay-x402-mcp on Smithery (60+ tools)
• Merged into coinbase/x402 ecosystem
• Google ADK community tool (google/adk-python PR Agent Identity Infrastructure: SATP as Foundation for Trustless AI Agent Economy #95, merged)
• Listed on x402scan, Dexter (ERC-8004 Agent #27567), and pay-skills catalog (PR pending)

[greptile-apps]

Greptile Summary

This PR adds a single entry for the Spraay x402 Gateway to the Developer Tools section of the README. The entry has been revised from earlier iterations to explicitly call out Solana support and condense the description to a single sentence.

• Adds [Spraay x402 Gateway] with a single-sentence description that calls out Solana and 14 other chains, 115+ endpoints, and links to the MCP server on Smithery and docs.
• The entry is consistent with neighboring x402-related entries in format and style (embedded links in the description also appear in the QuickNode RPC via x402 entry).

Confidence Score: 5/5

Safe to merge — this is a single README list entry with no code changes.

The change is a one-line addition to a curated list. It explicitly mentions Solana, follows the single-sentence description pattern used by neighboring entries, and introduces no logic, configuration, or dependencies.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Adds a single list entry for Spraay x402 Gateway in the Developer Tools section; description now explicitly mentions Solana and is structured as a single sentence.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[AI Agent] -->|HTTP request| B[Spraay x402 Gateway]
    B -->|HTTP 402 challenge| A
    A -->|USDC payment on Solana / 14 other chains| C[x402 Payment Facilitator]
    C -->|Payment confirmed| B
    B -->|API response| A
    B --> D[115+ Endpoints]
    D --> E[Batch Payments]
    D --> F[AI Inference]
    D --> G[Escrow]
    D --> H[Agent Wallets]
    D --> I[DeFi]
    B --> J[MCP Server on Smithery]

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