The Protocol Layer
The emerging standards and protocols that make agent-to-agent and agent-to-service payments possible. From x402 to AP2 to EIP-4337 — explained properly, with working implementations.
x402: the HTTP payment protocol agents actually need
A deep dive on the dormant HTTP 402 status code that Coinbase resurrected as a machine-readable payment primitive. How it works, why it matters for agentic APIs, and a full implementation walkthrough using Inferventis as a live example.
KYA-OS: the identity layer that makes agentic payments trustworthy
Know Your Agent Operating System — the DIF TAAWG protocol that gives every AI agent a cryptographic DID, a W3C Verifiable Credential delegation chain, and a tamper-evident JWS audit trail over every MCP tool call. The missing KYC layer for autonomous payments.
Why Lightning, USDC, and Stripe solve different problems
Comparing the major payment rails available to autonomous agents — latency, fees, finality, programmability, and which use cases each rail is actually suited for.
EIP-4337 and smart contract wallets for agents
Account abstraction as an enabling primitive — giving agents their own wallets with programmable spending limits enforced at the contract layer, not the application layer.
MCP + payments: connecting the tool layer to the money layer
How Model Context Protocol tool calls can trigger payment flows — the architecture pattern for making any MCP-enabled agent a first-class participant in paid API ecosystems.
Open Banking APIs were built for humans. Here's what needs to change.
PSD2 and PSD3 were designed for human-initiated consent and transaction flows. We walk through the specific points where these frameworks break for non-human actors — and what a machine-native Open Banking standard would look like.
Start with the x402 deep dive
Protocol mechanics, sequence diagrams, HTTP anatomy, and a working Python implementation — everything you need to understand the primitive powering agentic micropayments.