Add The Stall — x402 A2A data service (293 pay-per-call capabilities, v4.94.0)

[KyleMillion]

The Stall is a live x402-powered A2A data service from IntuiTek¹.

• Agent Card: /.well-known/agent.json (A2A-compliant, v4.94.0)
• MCP interface: /mcp (293 tools, no API keys)
• Payment: x402 / USDC on Base mainnet
• GitHub: https://github.com/thebrierfox/the-stall
• Live: https://the-stall.intuitek.ai

Capabilities

Stock prices, DeFi analytics, token security, options chains, prediction market probabilities, macro indicators (Treasury yields, CPI, Fed funds), congressional trades, SEC filings, sanctions screening, OSINT, earthquake alerts, clinical trials, Korean market movers (Upbit), X/Twitter intel, Solana meme radar, and more.

Placement

Added under Tools & Utilities > Payments / Protocol Extensions alongside a2a-x402 and a2a-x402-typescript — as a live reference of the x402 + A2A pattern in production.

Checklist

• Directly related to A2A (Agent Card at /.well-known/agent.json)
• Working link verified
• Concise, objective description
• Correct section placement
• Open source (MIT)

git: e574078 | version: v4.94.0 | caps: 293

[KyleMillion]

Checking in on this PR. The STALL MCP server is a live x402-native service on Base mainnet — agents can pay per-capability in USDC without accounts or API keys, which fits naturally in agent-to-agent payment flows. 210 capabilities live including research synthesis, financial intelligence, and OSINT.

Happy to answer any questions. Appreciate your consideration!