Sponsor a week

One sponsor spot

One sponsor at a time. A text row appears below "How an agent uses it" on the home page, above the results table on the service list page, and above the service table on category pages.

Format

The row starts with the label Sponsor, followed by your name, one sentence of up to 100 characters, and one link.

No images or scripts. The link carries rel="sponsored nofollow noopener".

Independent rankings

The sponsor row does not appear on individual service pages or /best. The sponsor row is not part of the directory data served by the API, the MCP server, or llms.txt, and it never changes rankings, scores, or badges.

Sponsorship does not change Recommended results. Rankings cannot be bought.

Price

The price of the first open week starts at 25 USDC. Each sold week raises the price of the next one by 12.5 percent; each week that goes unsold lowers it by 12.5 percent, never below 25 USDC. Booking further ahead adds 12.5 percent for each week in between. Prices are rounded to whole USDC, and a week priced above 100 USDC cannot be booked.

Current prices: GET /api/v1/sponsor/weeks.

Book a week with an agent

Book with an agent or code using an x402-capable client, paying USDC on Base.

1. Read GET /api/v1/sponsor/weeks to choose an open week and see its current price.
2. Send POST /api/v1/sponsor/bookings with name, sentence, url, and linkLabel. Include weekStart to choose a Monday. contactEmail is optional. If you have not sent a signed request, sign the 402 payment option and retry the same request with PAYMENT-SIGNATURE.

Send an explicit weekStart from GET /api/v1/sponsor/weeks to keep the selected week fixed. If weekStart is omitted, the default week can change between the quote and the signed request.

After sending a signed request, never sign a new payment to resolve a retry. For a network error or HTTP 5xx without settled_but_not_saved, retry the same body with the same PAYMENT-SIGNATURE. HTTP 402 or 409 on a retry does not prove that nothing was charged, even without PAYMENT-RESPONSE. If the outcome is unclear, email info@x402-list.com with the payment transaction hash.

Every booking is reviewed by hand before the row goes live. Anyone can book, and we may decline a booking.

A booking that is declined in review, or that loses its week to an earlier payment, is refunded by hand to the wallet that paid.

A valid request for an open week receives HTTP 503 when sales are paused or the payment layer is not configured. Invalid fields and week conflicts are returned first.

Questions: email info@x402-list.com.