Abstraxn
Pankaj Kumar

Author

Pankaj Kumar

Software Engineer, Abstraxn

Pankaj Kumar is a software engineer at Abstraxn, where he works on the infrastructure that lets AI agents authenticate, pay, and transact without human intervention. Before Abstraxn, he spent five years building payment systems and developer tooling. He writes about account abstraction, on-chain payments, and what it actually takes to make autonomous systems work reliably.

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Posts by Pankaj Kumar

The Seller Side of x402 Just Got Solved. The Buyer Side Is the Hard Part.01
Agentic Infrastructure10 min read

The Seller Side of x402 Just Got Solved. The Buyer Side Is the Hard Part.

Cloudflare made any resource chargeable over x402. Here's the buyer stack an AI agent needs (identity, wallet, payments, and policy) to clear that paywall safely.

Pankaj Kumar
What Is Agentic AI Identity and Why Every Agent Needs ERC-800402
Agentic Infrastructure17 min read

What Is Agentic AI Identity and Why Every Agent Needs ERC-8004

ERC-8004 is the on-chain identity standard for AI agents. Learn what agentic identity is, why an EVM address isn't enough, and how to register with the @abstraxn/agent-kit SDK.

Pankaj Kumar
AI Agent Spending Limits: How to Build a Mandate That Can't Be Overspent03
Agentic Infrastructure14 min read

AI Agent Spending Limits: How to Build a Mandate That Can't Be Overspent

A spending limit in your agent's prompt is a suggestion. Here's how to build an AI agent spending mandate enforced at the wallet and x402 rail, so it can't be overspent.

Pankaj Kumar
Building an AI Agent That Can Pay Its Own API Bills04
Agentic Infrastructure14 min read

Building an AI Agent That Can Pay Its Own API Bills

Most agents silently fail when they hit a 402. Here's how to build one that detects the error, pays the API autonomously with USDC, and keeps going using @abstraxn/agent-kit.

Pankaj Kumar
HTTP 402 Payment Required: What It Means, How to Fix It, and Why It's Suddenly Relevant Again05
Agentic Infrastructure11 min read

HTTP 402 Payment Required: What It Means, How to Fix It, and Why It's Suddenly Relevant Again

HTTP 402 Payment Required means your request was valid but payment is needed. Learn what causes it, how to fix it on npm, Stripe, WordPress, nginx, Azure, and why AI agents are finally making it relevant.

Pankaj Kumar
AI Agent Wallets: How to Build an Agent That Can Actually Pay06
Agentic Infrastructure16 min read

AI Agent Wallets: How to Build an Agent That Can Actually Pay

How to give an AI agent a crypto wallet it can't drain: an on-chain identity, gasless x402 payments, and a hard spending cap, all via account abstraction.

Pankaj Kumar