The Problem
In 2010, accepting payments on a website required a merchant account, a payment gateway, PCI compliance, and a bank relationship. Stripe made it two lines of code. The entire internet got monetized as a result.
Today, AI agents — autonomous software that takes actions on behalf of users — face the same problem with payments. If an agent needs to pay for a piece of data, it needs a credit card, a human to authorize the transaction, an OAuth flow, and a subscription. None of that works at machine speed. None of that works when the agent is making ten thousand small purchases per day.
x402 is the solution. It's an HTTP protocol extension — built on the long-forgotten 402 Payment Required status code — that lets any API charge for access, and lets any agent pay, without a human in the loop.
How It Works
The flow is three steps:
-
Step 1 — Request
An agent queries an API endpoint. The server returns HTTP 402 with a payment instruction: here is the amount, here is the wallet address, here is the network.
-
Step 2 — Pay
The agent signs a USDC transaction on Base mainnet and includes the payment proof in the next request header. No OAuth. No API key. No subscription.
-
Step 3 — Deliver
The server verifies the payment on-chain and returns the data. Transaction settles in seconds. The agent moves on.
That's it. Two HTTP requests. One micropayment. The data flows.
What We Built
Greenwood Financial Intelligence runs a live x402 implementation serving real financial data:
Six endpoints. Prices from $0.002 to $0.025 per query. Data sourced from SEC EDGAR, the House Clerk, the FEC, and Polymarket. Updated five times daily on weekdays. Payments settle on Base mainnet in USDC.
The discovery endpoint at /.well-known/x402 lets any agent find our endpoints automatically — no documentation required. An agent can query that URL, read the available products and prices, decide what it needs, pay, and consume the data. No human ever needs to be involved.
We are one of a small number of organizations globally running x402 in production with real data behind it.
Why This Is a Big Deal
Every API that currently sells subscriptions is a candidate for x402 repricing.
Bloomberg Terminal: $24,000 per year. Serves institutions. Inaccessible to individuals and AI agents.
Traditional financial data APIs: $99 to $999 per month. Requires an account, a credit card, a human decision.
Greenwood x402: $0.002 per query. No account. No subscription. Pay for exactly what you use. An AI agent running hundreds of queries per day pays a few dollars. A hedge fund running thousands pays hundreds — still a fraction of legacy pricing.
The same model applies beyond financial data. Legal AI agents paying per court document. Medical AI paying per clinical study. Research agents paying per academic paper. The market is every API that currently charges monthly subscriptions. That market is enormous.
The North Dakota Angle
This was not built in San Francisco. It was not funded by venture capital. It runs on a $6/month virtual private server in a DreamHost data center, operated from Grand Forks, North Dakota.
That is not a liability. It is proof that the infrastructure of the next internet does not require a coastal zip code or a Series A round. It requires curiosity, technical skill, and a willingness to build before the market catches up.
North Dakota has land, energy, and people who build things that work. The x402 protocol is being standardized now — Anthropic, Coinbase, and a16z are all pushing it as the payment layer for AI agents. The organizations that implement it first, in production, with real data, will have a seat at the table when the standard is finalized.
We are at that table. From Grand Forks.
For Developers
If you want to implement x402 in your own API, the pattern is straightforward. Return HTTP 402 with a payment instruction when an unauthenticated request arrives. Verify the payment header on subsequent requests. Return the resource.
The full implementation — including our x402 middleware, the /.well-known/x402 discovery schema, and the Base mainnet USDC verification logic — is available for review at api.greenwood.financial/.well-known/x402.
We are happy to talk to developers, researchers, and organizations exploring x402 implementation. Contact us at hello@greenwood.financial.
For Institutions and Policymakers
If you are evaluating the economic development implications of AI agent infrastructure, or exploring how North Dakota can position itself in the emerging AI economy, we would welcome a conversation.
The x402 protocol is not a cryptocurrency project. It is payment infrastructure — the same category as Stripe, PayPal, or ACH — built for the speed and scale that autonomous AI systems require. The difference is that it settles in seconds, costs fractions of a cent, and requires no intermediary institution.
Greenwood Online Services and Consulting LLC is a North Dakota company. We are building here on purpose.
Contact: hello@greenwood.financial