---
title: "Pay Per Request, x402 Agentic Payments"
description: "Agents and other automated clients can pay per call with x402, without provisioning or storing an API key."
canonical_url: "https://docs.carsxe.com/docs/changelogs/2026-07-29"
markdown_url: "https://docs.carsxe.com/docs/changelogs/2026-07-29.md"
last_updated: "1980-01-01"
x_farming_labs_generated_preamble: true
---

# Pay Per Request, x402 Agentic Payments
URL: /docs/changelogs/2026-07-29
LLM index: /llms.txt
Description: Agents and other automated clients can pay per call with x402, without provisioning or storing an API key.

## Added

- Agents and other automated clients can now pay per call with x402, without provisioning or storing an API key. Call a supported endpoint with no `key` parameter, read the price and payment details off the `402 Payment Required` response, pay, and retry with the payment header. Full walkthrough: [Agentic Payments](/docs/guides/agentic-payments).
- Coverage extends to more routes, including [Recalls by YMM](/docs/products/recalls-ymm) and the rest of the recall workflows.

## Improved

- `402` responses now spell out both ways forward — pay for this request, or authenticate with an API key — with a direct link to get one.

## Notes

- Existing integrations are untouched. Send `key=YOUR_API_KEY` and normal API-key billing applies; x402 only kicks in when no key is present.
- Read the price from the `402` response instead of hardcoding it; it can change.
- Built for one-off agent lookups. For steady volume, a plan is cheaper — see [Pricing](https://carsxe.com/pricing).

## Sitemap

See the full [sitemap](/sitemap.md) for all pages.
Docs-scoped sitemap: [/docs/sitemap.md](/docs/sitemap.md).
Well-known sitemap: [/.well-known/sitemap.md](/.well-known/sitemap.md).