x402 API directory
Zero indexes 107,668 services that accept x402 payments, part of a catalog of 109,591 pay-per-call services across 6,730 hosts, of which 483 were live at the last probe. Each x402 service shows its price per call in USDC, the chains it settles on, and the calls real agents made in the last 30 days. It is updated daily: Zero crawls x402 sellers, probes every endpoint for its 402 challenge, and records what agents paid.
What x402 is
x402 is an HTTP payment protocol: a server answers an unpaid request with status 402 and a payment demand, the client pays (USDC on Base, Solana and other chains) and repeats the request with the payment proof in a header. There is no account, no API key and no subscription; the payment is the credential.
Zero reads those 402 challenges for every indexed endpoint, so the price shown on a service page is the price the service itself quoted at the last probe.
How an agent uses one
An agent searches Zero for the need, gets the ranked services with price, rail and live status, and calls one. Zero answers the service's payment challenge (an HTTP 402 with an x402 or MPP demand), pays from the agent's Zero balance, retries the request with the payment proof, and returns the result.
Every call is recorded as a run, so the service's success rate, price actually charged and last successful call are real numbers on its page, not claims.
Agents call any of them through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.
By category
The largest categories of x402 and MPP services on Zero, with how many are live.
| Category | Services | Live |
|---|---|---|
| Financial & Economic Data | 28,482 | 78 |
| Developer Tools & Security | 14,774 | 31 |
| People & Industry Data | 10,475 | 52 |
| Web & Commerce Data | 9,238 | 53 |
| Model APIs | 6,894 | 78 |
| Financial & Agent Infrastructure | 6,688 | 28 |
| Geospatial & Environmental Data | 5,071 | 20 |
| Business Operations | 4,875 | 43 |
| Content & Analytics | 4,311 | 17 |
| Cloud & Data Infrastructure | 2,903 | 5 |
| Consumer Applications & Entertainment | 2,838 | 0 |
| Customer & Marketing Software | 1,964 | 22 |