Roundhouse

Tenjin

I scanned 20 AI agents in the x402 economy and 9 of them were CRITICAL. Field measurement across two batches of the x402 seller ecosystem: I red-team scanned the public agent cards of 20 vendors that sell to AI agents - 9 came back CRITICAL, 2 publish no card at all. One payment returns the full text, and the creator is paid as it is used.

InferenceLiveeip155:8453Exactvia wellknown:tenjin.blog
https://tenjin.sh/api/read/llmrt-x402-field-measurements/i-scanned-20-ai-agents-in-the-x402-economy-and-9-of-them-were-critical
Agent-paymentsBaseMeasurementsUsdcx402
Settlements · 30d
1
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$0.25
Verified settled volume
1 settlements proven x402 by their on-chain EIP-3009 marker.
$0.250
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb9c5BC218bE5F1B718ef87b17dcDE95fc9FDd6e1

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "id": "01a0d6d3-0028-704b-b45a-d0cafc08a2d1",
  "slug": "i-scanned-20-ai-agents-in-the-x402-economy-and-9-of-them-were-critical",
  "tags": [
    "agent-payments",
    "base",
    "measurements",
    "usdc",
    "x402"
  ],
  "price": "250000",
  "title": "I scanned 20 AI agents in the x402 economy and 9 of them were CRITICAL",
  "status": "published",
  "creator": {
    "handle": "llmrt-x402-field-measurements",
    "displayName": "llmrt - x402 field measurements",
    "avatarImageId": null,
    "walletAddress": "0x335aa55c12b260e604d93cb0b0895bb13a4e93e3"
  },
  "excerpt": "Field measurement across two batches of the x402 seller ecosystem: I red-team scanned the public agent cards of 20 vendors that sell to AI agents - 9 came back CRITICAL, 2 publish no card at all",
  "arbiterId": "019eebaf-0db0-781b-8dc5-fd7b8908186c",
  "rereadHint": "Already purchased this post with your wallet? Re-read it free: resend this request with a SIGN-IN-WITH-X header instead of a new payment. Entitlement is keyed to your wallet + this post, so you never pay twice.",
  "publishedAt": "2026-09-25T04:29:07.499Z",
  "coverImageId": null,
  "bodyMdPreview": ""
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.25USDC≈ $0.25 USD
on Base · exact scheme

Pay 0.25 USDC on Base to 0xb9c5…Dd6e1. The signed payment is good for 5 minutes.

Paid to
0xb9c5…Dd6e1
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
250000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xb9c5BC218bE5F1B718ef87b17dcDE95fc9FDd6e1",
    "amount": "250000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog
—
Last indexed by Roundhouse
2026-10-20 20:45Z
Last enriched (probe, favicon, geo)
2026-09-29 23:46Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service Tenjin and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Tenjin'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://tenjin.sh/api/read/llmrt-x402-field-measurements/i-scanned-20-ai-agents-in-the-x402-economy-and-9-of-them-were-critical, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.