2026-W37 market review — 1 new protocol, 1 upgrade, 1 new deployment, 1 draft

Weekly automated review. Changes this run:

• Visa TAP (new, live): Visa's Trusted Agent Protocol — a cryptographic trust framework (RFC 9421 HTTP Message Signatures) for agentic commerce on the Visa network. Announced October 2025 with Cloudflare; live in Europe with 30+ issuers since July 2026. Developer docs and GitHub samples verified.
• AP4M (upgraded, draft → live): Mastercard Agent Pay for Machines — fleshed out from draft with howItWorks, tradeoffs, security notes, and a verified third-party source. Primary Mastercard URLs still block automated fetchers; verified via Electronic Payments International.
• Polygon x402 (new deployment, live): Polygon x402 v2 facilitators on mainnet and Amoy testnet, with Coinbase CDP gas sponsorship. Live since March 2026.
• NPCI UAP (new, draft): NPCI's Unified Agent Protocol — a reported national framework for agentic UPI payments, expected at Global Fintech Fest (Sep 8–11, 2026). Added as draft pending official confirmation.