On 6 October we paid a stranger's service on our marketplace two tenths of a cent, with real USDC on Base, to see whether it was honest.
It was. Industrial Platform Sentinel was one of the few third-party hubs in our federation: a small x402 gateway that sold a wallet's balance and the current gas price on Base. We asked for our own treasury's balance and got ETH 0.000322741948925836 and USDC 1.037519, exactly what the chain said. We asked for the gas price and got a base fee of 0.005 gwei against the chain's 0.005000427. Each call cost $0.001 and settled in its own transaction. Our own equivalent route charges $0.004.
On 31 October its address started answering {"message": "Application not found"}. The service is gone.
What it earned
agenteconomy.report rates x402 services from public data: who pays them, how much settles, how often they answer. Its file for 31 October has this line for Sentinel:
| wallets that paid at least once | 14 |
| of them counted as organic (not monitors, not the operator) | 2 |
| settled in the last 14 days | $0.18 |
| share of daily probes answered | 55% |
| rating | CC, below the trust line |
Fourteen paying wallets sounds like customers. Most of them were measurement bots, ours among them: services like this are checked every day by people who study the market, and each check is a real payment of a fraction of a cent. The two wallets the report counts as organic paid the rest.
A hobby plan on a hosting platform starts at about $5 a month. Sentinel brought in about forty cents a month. Turning it off was the rational thing to do.
It is not just Sentinel
Our own marketplace, modelmarket.dev, sits in the same row of that file: rating CC, 3 organic paying wallets out of 11, $0.08 settled in 14 days. In October we counted about 5,000 unpaid 402 probes in 36 hours against one paid call, and it came from a measurement bot. Three other x402 sellers compared their numbers with ours and saw the same thing: the routes answer, and nobody comes back to buy.
So the problem Sentinel ran into is not quality. Its answers were correct and cheaper than ours. The problem is that in this market a small seller pays rent every month for a shelf that agents mostly walk past, and it will be months before anyone knows whether the foot traffic arrives.
A seller that switches off before then is gone for good. If demand does show up, the shelf is empty.
What we changed
We run HESTIA, a hosting runtime for agents that sell on AIMarket. Anyone can generate a key and deploy an agent there, no account and no fee: the code runs in a WebAssembly sandbox, the hearth signs each answer with the agent's own key, and the seller keeps what buyers pay. An idle agent costs us disk, not memory, so hundreds fit on one machine.
Until this week it had one gap that ruled out Sentinel and most sellers like it: no network. The sandbox has no sockets, by design, so an agent that reads a chain or a public API could not run there.
Now it can, through the hearth and on terms set at deploy:
{"slug": "base-gas", "egress_hosts": ["mainnet.base.org"], "capability": {…}, "source": {"kind": "template", "handler": "…"}}
def handle(payload):
r = fetch("https://mainnet.base.org", method="POST",
json={"jsonrpc": "2.0", "id": 1, "method": "eth_gasPrice", "params": []})
return {"gas_price_wei": int(r.json()["result"], 16), "chain": "eip155:8453"}
The sandbox still has no sockets. fetch() records the request and ends the run; the hearth makes the request, then runs the handler again with the response. The hearth only talks to the hosts the deploy named, which are listed publicly next to the agent so a buyer can see where an answer comes from. It only uses HTTPS on port 443, refuses any host that resolves to a private address (one such answer is enough), connects to the address it checked, follows no redirects, caps sizes and time, and gives each agent and the whole hearth a budget per minute. Each agent's allowed hosts are public in the hearth's roster, hestia.modelmarket.dev/v1/hearth, and the code is one file, hestia/egress.py, that you can read in ten minutes.
The offer
If you sell something over x402 and your own server costs more than it earns, deploy it on HESTIA. It's free, including the outbound requests. You keep your payout address and your prices, and the agent stays listed and answering while you wait to see whether buyers come. If they do, move it to your own infrastructure whenever you like: the agent's key, and so its identity, goes with it.
And if you built Industrial Platform Sentinel: your answers were right, and your node is still in our federation. It will come back on the first crawl after it answers again, on your old host or on ours.
Numbers: agenteconomy.report ratings file of 31 October 2026; our two paid calls of 6 October 2026, settled on Base in blocks 52253727 and 52253730.
Disclosure: I build HESTIA and the AIMarket federation, so sellers like Sentinel are also our competitors. The cover and both figures were drawn by code from the numbers in this post. AI assistance was used for the analysis, the code and the writing.
