Where the money in x402 actually goes — every paid call in a 30-day window, measured

1. Half of all the money goes to two endpoints

	Share of all paid calls
The single largest resource	39.0%
Top 10 resources	75.9%
Top 50 resources	85.5%
Top 1% of resources (about 150)	90.5%

Half of every call in the index lands on the top two resources. Two thousand hosts are listed; seven of them carry 82% of the volume.

Host	Calls / 30 days	Share
blockrun.ai	347,102	40.5%
ax1.vc	168,128	19.6%
stableenrich.dev	59,909	7.0%
agents.chain.link	56,073	6.5%
win.oneshotagent.com	29,898	3.5%
x402.sniperx.fun	27,387	3.2%
api.onesource.io	16,047	1.9%

2. "Unique payers" mostly counts crawlers paying once

The index reports l30DaysUniquePayers per resource, and it is tempting to read it as customers. Check it against calls:

8,875 resources — 58.7% of everything with a paid call — have calls exactly equal to payers. Every wallet that ever paid them paid exactly once. Together they carry 1.8% of all calls.
9,442 resources (62.5%) sit below 1.5 calls per payer.
10,552 resources have exactly one payer. Only 66 have fifty or more.

That is the signature of catalog sweeps: wallets that pay every endpoint once to index it, score it, or research it. A payer count is a measure of how many crawlers have found you. It is not demand.

3. The market is 4.6% of the index

Define repeat purchase as a resource with at least 20 calls in 30 days and at least 3 calls per paying wallet — someone came back. That filter keeps 699 resources on 234 hosts: 4.6% of what has a paid call.

Those 699 resources carry 93.0% of all calls.

So the honest description of x402 today is not "15,000 services". It is roughly seven hundred services that people return to, plus fourteen thousand that have been indexed.

4. What repeat buyers actually pay for

We classified the top 40 repeat-purchase resources by hand (84% of all volume) after finding the keyword buckets too rough. Rounded:

What it is	Calls / 30 days in the top 40	Examples
LLM inference and agent endpoints	~347,000	chat completions at $0.002/request (334k calls, 183 payers, ~1,800 calls each); Anthropic-compatible messages; grounded answers
AI verdicts on onchain data	~168,000	"send a Base token contract, get an AI-written verdict" — $0.02, 2,510 payers, the widest customer base in the index
Web search and page reading	~83,000	Exa neural search (46k calls, 194 payers), Firecrawl, page→markdown, SERP, X/Twitter search
Execution and workflow	~61,000	Chainlink workflow execution; send-token execution fees
Trading signals and token analytics	~36,000	smart-money / KOL / whale flows per token; Solana token authenticity; liquidation maps
Enrichment and identity	~23,000	email deliverability and validation, LinkedIn/company/person enrichment, people search

Not one of the top 40 is a raw chain read — no gas price, block number, balance lookup or token price feed. The keyword pass over the whole index says the same thing more roughly: commodity chain reads are 2.6% of all calls and 1.2% of repeat-purchase calls; plain market prices 2.2%; CAPTCHA solving 0.3%.

The pattern is not "crypto sells" or "data sells". It is: things a public RPC or a free API answers for nothing do not earn; things that are derived, computed or searched do. Inference is the largest category by a wide margin, and one inference endpoint alone is 39% of the index.

5. The money is at fractions of a cent

	p25	median	p75	call-weighted median
All paid resources	$0.003	$0.010	$0.020	$0.005
Repeat-purchase resources	$0.003	$0.010	$0.025	$0.003

67.8% of resources are priced at one cent or less, and they carry 68.9% of calls. At the other end, 298 resources are priced at $1 or more; between them they took 1,791 calls in 30 days. Repeat buyers pay a third of a cent per call and call a lot.

And it is a Base market: 93.9% of calls settle on eip155:8453, 5.2% on Solana, everything else rounds to zero.

Three traps in reading this index

A single payer can be a single integration. agents.chain.link shows 38,841 calls from one wallet. That is one relationship, not a market, and any "calls per payer" ranking puts it at the top. Weight by payers before imitating anyone.
The 30-day figures move by whole resources. Our read on 20 September showed 479,100 calls; on 21 September, 857,072. The difference is essentially one endpoint entering the window with 334k calls. Date any number you quote from this index, and expect the headline to swing.
Categories are a judgement. The keyword buckets over 15,000 descriptions are approximate (26.5% of calls fall into "other"), which is why section 4 is hand-classified and limited to the top 40. "AI verdict on a token" sits between inference and chain analytics; it has its own row.

Also: the index covers resources that opted into discovery and settled through the CDP facilitator. Payments through other facilitators, and endpoints that never declared themselves, are not in it. Everything here is Coinbase's own accounting; we did not audit the settlements.

If you sell over x402

Sell something derived: a verdict, a search, an enrichment, a completion. A field a public node already serves will be indexed and paid for once by every crawler, and then not again.
Price in the $0.002–$0.01 range and expect volume, not margin. The $1+ tier is empty of calls.
Be on Base. The rest is a rounding error today.
Expect one integration to dominate your numbers, and measure your payer count against your call count before believing either.

Reproduce it

Read https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?limit=100&offset=N until pagination.total is exhausted. For each item take quality.l30DaysTotalCalls, quality.l30DaysUniquePayers, accepts[0].amount (atomic USDC, divide by 1e6) and accepts[0].network. Repeat purchase = calls ≥ 20 and calls / payers ≥ 3. Everything above is a sort, a sum and a quantile over those four fields; the script is about 120 lines. The full numbers behind this page are published beside the npm package at github.com/fiatdock/fiatdock.

FiatDock is a marketplace where MCP services are listed and bought per call over x402, with settlement after the seller answers. This measurement decides which services we go looking for — and what we have stopped building. Selling something on this list? What sells, and how to list it · what is listed today.