Re-probed every 6h · last run {{ t_probe }}

The graded index of APIs your AI agent can pay for.

x402 lets software pay for a single HTTP request in USDC — no signup, no API key. We probe every discoverable x402 service — {{ t_services }} across {{ t_domains }} domains, every 6 hours — grade each A–F on whether an agent can actually use it, and let your agent call all the passing ones through one endpoint: one key, one prepaid balance (card or USDC).

{{ t_df }} of them currently grade D or F. Browse before your agent buys.

Grade distribution {{ t_services }} services
{{ d.grade }}
{{ d.count }} {{ d.pctLabel }}
{{ t_callable }}
callable through the gateway
{{ t_domains }}
distinct domains

New to x402? Read the 5-minute guide for agents and the humans configuring them →

The graded index

Showing the top of the index by 30-day demand; search and filters cover all {{ t_services }} services. Each row links to its grade breakdown.

live · {{ t_probe }}
Service {{ nameArrow }} Grade {{ gradeArrow }} Price {{ priceArrow }} Our price 30-day demand {{ demandArrow }}
{{ r.name }} {{ r.pathFull }} ours
{{ r.description }}
 {{ r.grade }} {{ r.priceDisp }} {{ r.ourPriceDisp }}
{{ r.callsDisp }}
{{ r.payersDisp }} payers
No services match those filters.

Prices in USDC. Our price = upstream + 25% (min $0.005) — we front the upstream x402 payment so your agent does not need a wallet. Failed calls auto-refund.

How it works

One endpoint discovers the graded catalog and calls any passing service. We front the upstream USDC payment in both versions of the x402 protocol, so your agent holds one balance instead of a wallet per API.

{{ s.num }}

{{ s.title }}

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Pricing, in full: you pay the upstream price plus a 25% markup, with a $0.005 floor per call. Nothing else. If a call fails, the charge is automatically refunded to your balance.
+25%
markup
$0.005
minimum / call
refund
on failure

Connect your agent

The gateway is a live MCP server. Point your agent at one endpoint and it can discover the graded catalog and call any passing service with prepaid credits.

  1. 01Create an account — one click, no email. You get a key, shown once.
  2. 02Top up credits with USDC (0.10 per pack, credited 1:1).
  3. 03Drop the config below into your MCP client and start calling.
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What self-onboarding looks like from the agent's side:

Terminal demo: an agent lists graded x402 services over MCP, creates its own account with no email, generates a Stripe top-up link for its human, and makes a paid call
The State of x402

A monthly index report, not a newsletter

Grade shifts, new A-tier services, and demand trends across the whole index — once a month. Optionally, an alert when a service you call changes grade. Read the first report →

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One email a month. No tracking pixels. Unsubscribe in one click.