Let your AI agent autonomously buy data — x402 + gasless prepaid + MCP on Base

AI agents can now pay for APIs by themselves. Here’s a live endpoint that does it end-to-end on Base (USDC), and how to plug it into your agent in minutes.

The problem

HTTP 402 (“Payment Required”) lets an API charge per call in crypto. But most x402 endpoints make the agent send an on-chain transaction every single call — gas + latency + a signature each time. That’s fine for a one-off, terrible for an agent making hundreds of calls.

The fix: deposit once, then gasless

https://x402.obolpay.xyz adds a prepaid balance: the agent deposits USDC once, then pays per call with an off-chain signed voucher — no on-chain tx, no gas, instant.