The seven most common x402 seller mistakes, and how to fix them
An x402 API asks for payment with an HTTP 402 Payment Required answer, and an AI agent pays it per call in stablecoins. That only works when the 402…
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Two new x402 APIs for AI agents: CSP permissive-source budget scorer + live SMTP open-relay test (2026-10-15, cycle 154)
What shipped Cycle 154 added two new paid x402 endpoints to the URL Metadata API for AI agents: /api/csp-permissive-directive-budget ($0.0005 USDC)…
x402 vs MPP: Which Rail Should an AI Agent Pay On?
x402 vs MPP: which rail should an AI agent pay on? x402 and MPP are diverging, not converging. x402 is a family of on-chain payment schemes attached…
Why can’t my browser x402 client read the PAYMENT-REQUIRED header?
Quick answer: browsers hide non-standard response headers from cross-origin scripts. Send Access-Control-Expose-Headers: PAYMENT-REQUIRED, PAYMENT-R…
Riskified's Agent Identity Risk Intelligence Answers the Wrong Question First
On October 8, 2026, Riskified (NYSE: RSKD) launched Agent Identity Risk Intelligence — a system that identifies the AI personal assistant behind an…
Sui Agent Payments x Alibaba Cloud: Per-Call USDC Billing Is Live — But Who Scores the Call?
Sui Agent Payments × Alibaba Cloud: Per-Call USDC Billing Is Live — But Who Scores the Call? On October 7, 2026 — announced live at Sui Basecamp — S…
T54 launched an agentic wallet on XRPL — but a spending limit is not a gate
T54 launched an agentic wallet on XRPL — but a spending limit is not a gate On October 3, 2026, at XRP Seoul 2026, T54 launched a native agentic wal…
Who Is the x402 Foundation's Executive Director? The Standard for Machine Payments Still Has No Authorization Layer
Who Is the x402 Foundation's Executive Director? The Standard for Machine Payments Still Has No Authorization Layer On October 1, 2026, the Linux Fo…
What Is Cloudflare Monetization Gateway? The Callback Is the Gate — the Judgment Is Missing
What Is Cloudflare's Monetization Gateway? The Callback Is the Gate — the Judgment Is Missing On September 30, 2026, Cloudflare moved its Monetizati…
What is Ethereum zkAPI? A zero-knowledge proof is not a payment authorization
What is Ethereum zkAPI? A zero-knowledge proof is not a payment authorization On October 1, 2026, the Ethereum Foundation and the Open Anonymity Pro…
Robinhood Agents Trade Without Approval: The Gate Is a Toggle, and the Risk Is Yours
Robinhood Agents Trade Without Approval: The Gate Is a Toggle, and the Risk Is Yours On September 29, 2026, at HOOD Summit 2026 in Houston, Robinhoo…
The 402 beta is open. The roadmap says 'discovery.'
A payment rail shipping is not the same event as a market forming. This week gave us a clean example of both halves, and the second half is the one…
Hash-chained revenue: why your agent payments need provenance
Every x402 settlement you have ever seen was, until recently, opaque. The merchant told you what they earned and you either trusted them or did not.…
Собрал платный API для ИИ‑агентов на x402. Рынка не нашёл — зато нашёл четыре бага
Собрал платный API для проверки кода на протоколе x402 — агент получает HTTP 402, платит в USDC, получает подписанный сертификат…
Why I'm Passionate About x402
I've been building on the web for a long time, and I've paid a lot of middlemen along the way: payment processors, billing platforms, marketplaces,…
Seven Cloudflare Settings That Quietly Turned Away Paying Agents
Originally published at forgemesh.io . Yesterday Cloudflare flipped its new AI-crawler defaults and we published what that switch does and does not…
x402 in production: what 267 probed servers taught us
x402 in Production: What 267 Probed Servers Taught Us A field report on payment-header interop, non-deterministic 402 challenges, and what actually…
The settlement is the write event
What a penny from a stranger taught us about how agents actually find things. At 02:59:06 UTC on August 25, a wallet we had never seen paid our veri…
I Built a French AI Voiceover API That Only Accepts Payment From Robots
Nobody signed up for my API. Nobody generated an API key. Nobody clicked "Subscribe." And that's by design — because the only customers I actually w…
HTTP 402 was the easy part — x402scan still refused the tunnel
This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry . The protocol looked finished when curl printed 402 . The catalog…
Circle Ships an App Store for AI Agents — and Discovery Becomes the Moat
Circle Ships an App Store for AI Agents — and Discovery Becomes the Moat On August 16, Circle shipped an Agent Marketplace : a curated catalog of x4…
x402 Signs the Money, Not the URL. I Checked 18 Fields.
An x402 payer signature does not cover the URL. It commits to the amount, the recipient, the token contract and the chain, and to nothing that says…
A changed payTo address is not a honeypot: 272 payTo changes, 13 lookalikes, zero proof
In my last post I listed the ways an x402 payment can go wrong. Vector number one was the dynamic payTo swap : in x402 the destination address can c…
An independent verifier audited my compliance API's hash chain byte-by-byte — in public, same day, both sides shipped fixes
I'm a solo developer in Bogotá, Colombia. This week something happened on a GitHub issue that I think is worth documenting, because it shows what "t…
How to prove an AI agent output existed — x402 + NEAR anchoring in practice
How to prove an AI agent output existed — x402 + NEAR anchoring in practice Why this matters You deployed an AI agent. It generated a financial repo…
An AI agent just paid a Lightning invoice. The agent only holds USDC.
Today something happened that hasn't happened before. An AI agent sent a task to Cinderwright: "tell me a joke." The agent's wallet holds USDC on Ba…
I Built a Pay-Per-Call Crypto Signal API with x402 — Heres the Architecture
I Built a Pay-Per-Call Crypto Signal API with x402 — Here's the Architecture TL;DR: I shipped a live crypto signal API where every call costs $0.01…
I tried monetizing my MCP server with x402 — production needs more than npm install
I built DomainIntel , a free MCP server that does domain intelligence — WHOIS, DNS analysis, SSL checks, email security scoring. It runs on Vercel s…
Let Your AI Agent Pay for APIs Automatically with x402 + AgenticTrade
Here's the problem with AI agents today: they can do incredible things, but they can't pay for them. You've built a LangChain agent, a CrewAI team,…
Monetizing AI Agents with x402, CloudFront, and Lambda@Edge
Introduction Recently, have you been hearing the term x402 more often? As payments between AI Agents become a reality, x402 is attracting attention…