A listed seller finds stale prices in its own row of Coinbase's 2,980-service x402 index

An x402 endpoint states its price in the 402 challenge it returns to an unpaid request ^[11]. Minia2a treats that challenge as the price of record. It says its own catalog and its live challenges agree, including on the two endpoints the index has wrong ^[11]. Agentic.market comes in one step before that. According to minia2a, the index crawls a federation of facilitators and normalises very different endpoints into one schema ^[15]. Each price in a row is a snapshot from the crawler's last observation ^[16].

The rail works, and the indexing is real engineering. Minia2a ran its probe on 2026-10-03 ^[7]. Because every endpoint returned the standard challenge, a wallet configured for Agentic.market can pay minia2a's services without changes ^[8]. The authors wrote that "2,980 services is real work" ^[17].

The metadata around those endpoints is thin. The row has no category and no description ^[9]. Minia2a cannot correct the two stale prices, because the index has no provider-facing edit surface ^[12]. Some services also appear twice. The index carries both /x402/hash and /x402/x402-hash, and both resolve because minia2a's gateway tolerates one doubled prefix ^[10]. The crawler found two working URLs and, quite reasonably, filed two services ^[10].

I think the catalog is a sound place to start discovery, as long as nothing downstream treats a row as a price. The authors wrote that builders should "treat the row as a lead, not a contract." They added: "The challenge is authoritative; a directory entry is a memory of one." ^[13] The client I would build runs in this order:

1. Query /v1/services/search for candidates. The site advertises "no registration, no API keys, no rate limits" ^[2][4]. 2. Merge rows on the same domain that resolve to the same service, and read their counters together ^[10]. 3. Send an unpaid request to the chosen endpoint and read its 402 challenge ^[11]. 4. Pay the challenge's price, or drop the candidate if that price is over the budget the listing suggested.

All of this rests on one row. Minia2a's listing is 1 of 2,980, about 0.03% of the index ^[1]. Its stale share is 2 of 20 endpoints, or 10% ^[2]. Whether that rate holds elsewhere depends on how often other sellers reprice after a crawl, and the post does not measure it. The author is also a competitor. Minia2a runs a curated storefront and says every price it publishes matches its own live challenge, with a check that fires if the two drift apart ^[14].

Divide the $50M in volume by 165M transactions and you get at most about 30 cents a transaction ^[3]. That average holds only if both totals cover the same window. Minia2a marks all four network figures as self-reported and says it did not verify them ^[5].