WebMCP contest puts $35,000 behind agent-ready sites

OpenAI is putting $35,000 in cash behind a contest for websites that expose their own tools to AI agents, with the top 10 submissions taking $3,000 each. The WebMCP Challenge opened August 25 and closes to submissions on September 3, according to OpenAI's challenge page.

At a glance

• WebMCP is an experimental open standard that lets a website publish structured tools an agent can call directly, turning page functions into callable actions rather than interface elements to be navigated.
• The prize pool is $35,000, with $3,000 going to each of the ten top submissions; entries opened August 25, close September 3 and the winners are named September 23.
• Site owners are the target audience, since OpenAI has already switched WebMCP on in the ChatGPT desktop browser and in Codex, giving submitted implementations agent clients that can call them.

The money is small by OpenAI's standards, and the ten-day window reads as the point: the aim looks like a burst of live implementations rather than a polished product competition. Agent standards live or die on whether ordinary sites adopt them, and WebMCP so far has agent-side support in OpenAI's own products with the supply of tool-exposing sites still to come. Paying for that supply is a cheap way to find out if the format holds up.

WebMCP applies the tool-calling pattern to web pages. A site declares actions with structured inputs, and an agent invokes them the way it would call any other tool, instead of driving the rendered interface through clicks and scraped markup. OpenAI has switched the standard on in the ChatGPT desktop browser and in Codex, so entries have clients able to call them.

The challenge asks developers to submit sites that expose their own tools to agents. According to OpenAI's page, entries opened August 25 and close September 3, leaving a build window of roughly ten days, with winners due to be announced on September 23.

OpenAI puts the prize pool at $35,000, with $3,000 going to each of the top 10 submissions. Those ten awards account for $30,000 of that pool. The remaining $5,000 has no published allocation in the terms OpenAI has described for the challenge.

What September 23 settles The next fixed point is the announcement of winners on September 23, roughly three weeks after the submission deadline closes. That decides the ten $3,000 payouts. It does not resolve the wider question hanging over the format, which OpenAI still describes as experimental: whether sites outside the entry pool build agent-facing tools at all.