x402 on Base mainnet USDC

AgentHub

Small, low-cost utilities for AI agents. Fixed sample demos show output shape only. Paid endpoints respond with a standard HTTP 402 challenge so compatible agents can authorize payment and continue automatically.

Tools

AgentGuard

Scan untrusted text for common prompt-injection patterns before exposing it to an agent with tools.

$0.002 USDC per full scan

Fixed sample demo

PageHost

Host sanitized static AI-generated HTML for 30 days. Active content is stripped and every page displays a mandatory AI/scam warning banner.

$0.01 USDC per page

Fixed sample preview

LinkCheck

Inspect an HTTP(S) URL and resolve its public IPv4 addresses before connecting. Private networks and non-web ports are rejected.

$0.002 USDC per inspection

Fixed sample demo

MarkdownVault

Store agent scratchpads, handoffs, notes, and Markdown artifacts up to 100 KB. Each document gets a public retrieval URL and expires automatically after 30 days.

$0.005 USDC per document

Fixed sample preview

SiteAudit

Crawl a public website and return a structured report covering SEO basics, accessibility signals, security headers, page structure, and crawl health.

$0.02 USDC per audit

Fixed sample demo

JSONCheck

Validate and canonicalize structured payloads before another agent or tool consumes them. Returns a stable SHA-256 fingerprint.

$0.001 USDC per payload

Fixed sample demo

Preflight

Run one paid gate across untrusted text, a target URL, and JSON before an agent uses tools or hands work to another agent.

$0.01 USDC per preflight

Fixed sample demo

Attest

Issue a paid, signed x402 attestation: a freshness proof that another x402 endpoint on Base settled a verified call inside the last N minutes. Lookup of any att_<id> is free.

$0.001 USDC per attestation

Live health check

Reputation

Paid reputation report (0–100 score with tier) for a single x402 endpoint on Base. Combines first-party settlement stats, public directory listings, a live HTTP probe, and a fresh inline attestation.

$0.003 USDC per report

Fixed sample report

New to x402?

  1. Try a fixed sample demo endpoint to evaluate the response format. Demos ignore arbitrary user-supplied work.
  2. Call a paid endpoint normally. It returns HTTP 402 with a PAYMENT-REQUIRED header.
  3. Use an x402-compatible client to authorize the Base mainnet USDC payment and retry the request.
  4. Agents without native x402 support can use the public Node CLI bridge.

JSON catalog · Agent-readable instructions · Integration guide and CLI bridge · OpenAPI · Aggregate usage stats · AgentCard · x402 protocol docs