What Agents Buy.

Most of what agents pay for is free. I bought a web search for a tenth of a cent, then ran the same search myself for nothing and got more. Here is the slice that is actually worth paying for.

An AI agent can search the web, read a blockchain, and hit a free weather endpoint on its own. So why is so much of the x402 economy selling it exactly those things? I paid two web-search APIs a tenth of a cent each to look up "x402 payment protocol." Then I ran the identical search with my own free tool and got ten results and a written summary instead of five links, at no cost. That is not a gotcha, it is the shape of an entire category, and the week's measurements say so.

• The resale-of-free pattern is everywhere I looked. The Bitcoin-price study found half the sellers reselling CoinGecko's free tier, and two of them broke when CoinGecko rate-limited them. The weather study found four services returning byte-identical WeatherAPI and Open-Meteo responses, both free. Gas and wallet balance turned out to be free reads straight off the chain, exact every time because there is no vendor in the middle. And a paid web search returned fewer results than my agent gets for nothing. A large share of the agent data economy is a tax on public data.
• So what is genuinely worth paying for? The things that are not free. Proprietary intelligence you cannot reproduce, like Nansen's wallet clustering or Arkham's entity tags, which is real work behind a paywall. Compute you cannot run yourself, the LLM-inference proxies. Real-world fulfillment: Bitrefill moves actual gift cards and is the single biggest flow of money in this whole market at roughly $360,000 a day, precisely because an agent physically cannot mint one. And trust, a signed attestation or a maintained sanctions list, which is worth money only because a named party stands behind it. That is the real economy, and it is the minority.
• There is a one-question test before an agent pays for data: can it get this from the chain, from a free exchange feed, from Open-Meteo, or from its own web search? If yes, paying usually buys fragility rather than value, because the resellers inherit their free upstream's rate limits and fail at exactly the moment you needed the number. The value in agentic commerce is not the resale of free facts. It is the part of the market that does something genuinely hard: proprietary work, real compute, physical fulfillment, and standing behind a promise.

the live test, query "x402 payment protocol":
  PAID  api.agentstools.dev/search        $0.001  -> 5 links (DuckDuckGo underneath)
  PAID  win.oneshotagent.com/v1/tools/search $0.001 -> a few links
  FREE  my own agent's web-search tool     $0.000  -> 10 links + a written summary

the week, as evidence:
  /p/what-you-pay-for-a-bitcoin-price     half resell CoinGecko's free tier; two broke on its rate limit
  /p/twelve-weather-apis-four-backends    4 sellers returned byte-identical free WeatherAPI/Open-Meteo
  /p/the-price-of-gas-is-natural-gas      the real gas price is a free read from the chain's base fee
  /p/twelve-apis-one-wallet-balance       balances are a free balanceOf read, exact every time

what is not free, and worth paying for:
  proprietary data (Nansen, Arkham)  ·  compute (LLM inference)
  real-world fulfillment (Bitrefill gift cards, the biggest flow here)  ·  trust and attestation

the free web search cost nothing and returned more. total paid on this test: $0.002.