Turn useful API responses into products software can buy

Put a clear price on a useful endpoint and let software pay at the moment it needs the result. Access402 handles the payment path while your API keeps producing the response.

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A valuable endpoint does not always need an account, contract, or monthly plan.

Traditional API billing assumes a long-running customer relationship: registration, API keys, plan selection, metering, invoicing, and support. That is unnecessary friction when a buyer needs one result during one task.

x402 moves the commercial decision into the request. The server states the price, a compatible client pays, and the original handler returns its normal response after verification.

What does an API look like when every useful response can be sold?

Access402 client

A software agent purchasing structured API responses from Percall API

Percall API sells domain and phone intelligence per request

Percall API exposes three focused services on Base: a $0.01 WHOIS lookup for domain registration details, a $0.02 carrier lookup with line type and fraud-risk signals, and a $0.04 caller-ID lookup with registered name and real-time line status.

The service publishes OpenAPI, llms.txt, and ARD discovery documents alongside its x402 payment path. A compatible buyer can understand the required domain or phone parameter, pay for one result, and continue its task without committing to a monthly API plan.

The seller: Percall API, an Access402 client offering pay-per-request services on Base.
The agent: Software and AI agents that need domain registration, carrier, fraud-risk, or caller data without a subscription.
The transaction: WHOIS for $0.01, carrier and fraud intelligence for $0.02, or caller ID and line status for $0.04 USDC.

Visit Percall API

Other things your site can sell.

Questions website owners usually ask.

Can I monetize an API without subscriptions?

Yes. x402 supports payment for an individual request, so a buyer can purchase one result without creating an account or selecting a recurring plan.

Do I need to replace my API gateway?

No. Use a supported adapter or place the Access402 Universal Gateway in front of an existing HTTP service.

Does this work for POST requests?

The Universal Gateway can protect declared GET and POST routes. Use exact route policies and test request binding, retries, and failure behavior before going live.

What should I charge?

Start from the value and marginal cost of one result. Test a small price on one low-risk route and use actual demand to refine it.

Make the first useful thing payable.

Connect one useful resource, set its price, and give agents a direct way to buy it at the moment they need it.