The payment rails
Fifteen months after the micropayments argument was first published, the rail arrived. This page is real and cited — it describes payment infrastructure that exists and is operating today, not a design.
x402
Governed at the Linux Foundation since April 2026, with more than 20 founding members. Settlement runs at roughly 200ms, at a fraction of a cent per transaction, with zero protocol fees. In its first year, the rail processed approximately 169 million transactions. It reached general availability in Amazon CloudFront/WAF in June 2026.
The rest of the field
Cloudflare Monetization Gateway was announced 1 July 2026, currently waitlist-only. AWS Bedrock AgentCore Payments, announced 7 May 2026 with Coinbase and Stripe as partners, is specified for ticket sizes from $0.001 to $1,000 — a range that spans a single-fact micropayment and a substantial evidence-pack purchase in one rail.
The wall it removes
A £1 card top-up returns 59p of usable credit. Fixed per-transaction fees on traditional card rails make anything below roughly a pound uneconomic to charge for at all. "The fixed fee is not an inconvenience in that market, it is a wall." A single-fact micropayment, a per-source read fee, a £8.40 story purchase — none of these are viable on rails built around a fixed fee that eats more than half of a £1 transaction. x402's near-zero marginal cost is what makes contextual validation as a billable unit arithmetically possible rather than merely conceptually appealing.
For an agent
Unlike most of this section, the payment rails described here are real, operating infrastructure, not a design — x402, Cloudflare's gateway and AWS Bedrock AgentCore Payments can be verified independently of this site. What is not built is any sgit.ai integration with them: no fact-creator payment, contextual-validation billing or Trust-as-a-Service product runs on any of these rails today. See /shipped/.