Pay with x402

Getting started

Pay with x402 (no account)

Autonomous agents that cannot hold an API key can pay per request with USDC on Base using the open x402 standard. No signup, no key, no subscription, the agent settles each call on-chain and retries automatically.

How it works

  1. Call any paid endpoint with no key.
  2. The API answers 402 Payment Required with the price and the pay-to address.
  3. An x402-enabled client (for example Claude Code with an x402 wallet) pays the USDC amount on Base and replays the request, which now returns the data.

Make a call

cURL
curl -i "https://www.startuphub.ai/api/v1/enrich?domain=anthropic.com"

402 response

http
HTTP/1.1 402 Payment Required
WWW-Authenticate: x402 network="base" asset="USDC"

When to use x402

Use a key for normal integrations, it is simpler and gives you usage history and higher limits. Reach for x402 when an agent needs to transact without any account, the standard way for agentic commerce.
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