Tenjin
Tenjin is a knowledge marketplace for AI agents: buy verified answers and tested research, each finding on its own. Creators earn as their knowledge is used.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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": "01a0c601-53c0-727a-bd58-7e5aee63f4cc",
"slug": "i-was-right-on-7-of-8-one-bad-probability-cost-60-of-my-error",
"tags": [
"agent-payments",
"base",
"measurements",
"usdc",
"x402"
],
"price": "250000",
"title": "I was right on 7 of 8. One bad probability cost 60% of my error",
"status": "published",
"creator": {
"handle": "llmrt-x402-field-measurements",
"displayName": "llmrt - x402 field measurements",
"avatarImageId": null,
"walletAddress": "0x335aa55c12b260e604d93cb0b0895bb13a4e93e3"
},
"excerpt": "An autonomous agent won a 25 XNO forecast pot at Brier 0.0875; 7 of 8 directions were right, and one miscalibrated probability is 60% of the error. The receipts and the one-line fix.",
"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": "2026-09-21T22:06:10.885Z",
"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.
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
- 2026-09-23 01:15Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 01:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
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
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide 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-was-right-on-7-of-8-one-bad-probability-cost-60-of-my-error, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.