Roundhouse AI

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.

OtherLiveeip155:8453Exactvia cdp
https://tenjin.blog/api/answer
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 21 snapshots so far.
$10.02
Verified settled volume
54 settlements proven x402 by their on-chain EIP-3009 marker.
$0.050
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-14 22:34Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x578c640E2D53023066026381B8CC362539741063

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.

Accepts

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

0.05USDC≈ $0.05 USD
on Base · exact scheme

Pay 0.05 USDC on Base to 0x578c…41063. The signed payment is good for 5 minutes.

Paid to
0x578c…41063
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
50000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x578c640E2D53023066026381B8CC362539741063",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "question": "Which Base DEX aggregators settle x402 payments today?",
          "freshWithin": "P30D"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "model": "the model that produced the answer",
          "answer": "One synthesized answer to the question, carrying a [1] marker on each claim. Resolve a marker through citations[].index, never by array position.",
          "decision": "ANSWERED",
          "searchId": "00000000-0000-4000-8000-000000000000",
          "citations": [
            {
              "url": "https://tenjin.blog/api/read/example-publisher/example-piece",
              "index": 1,
              "title": "The piece the claim was drawn from",
              "creator": "example-publisher",
              "resourceId": "00000000-0000-4000-8000-000000000001"
            }
          ],
          "calibration": "hybrid-v1",
          "generatedAt": "2026-01-01T00:00:00.000Z"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "question"
              ],
              "properties": {
                "maxPrice": {
                  "type": "string",
                  "pattern": "^\\d{1,39}$",
                  "description": "Optional ceiling on the flat answer price, in atomic USDC units as a digit string (\"10000\" = $0.01). Below the quoted price the request is refused with `max_price_below_quote` rather than degraded; it never narrows which pieces the answer draws on."
                },
                "question": {
                  "type": "string",
                  "maxLength": 512,
                  "minLength": 1,
                  "description": "The question to answer, 1 to 512 characters. Leading and trailing whitespace is trimmed before the length check, so an all-whitespace value is rejected."
                },
                "freshWithin": {
                  "type": "string",
                  "description": "Optional recency window as an ISO 8601 duration, P<n> followed by D, W, M or Y (for example \"P30D\"). n must be nonzero."
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  },
  "builder-code": {
    "info": {
      "a": "bc_kc0altv3"
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "a": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "App builder code"
        },
        "s": {
          "type": "array",
          "items": {
            "type": "string",
            "pattern": "^[a-z0-9_]{1,32}$"
          },
          "description": "Service builder codes"
        },
        "w": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "Wallet builder code"
        }
      },
      "additionalProperties": false
    }
  },
  "sign-in-with-x": {
    "info": {
      "uri": "https://tenjin.blog/api/answer",
      "nonce": "cee05133b0688ad61eb2783c84f0ae0d",
      "domain": "tenjin.blog",
      "version": "1",
      "issuedAt": "2026-08-14T22:34:41.281Z",
      "resources": [
        "https://tenjin.blog/api/answer"
      ],
      "statement": "Prove the wallet that paid for this answer to collect it again. Signing costs nothing and moves no funds."
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "domain",
        "address",
        "uri",
        "version",
        "chainId",
        "type",
        "nonce",
        "issuedAt",
        "signature"
      ],
      "properties": {
        "uri": {
          "type": "string",
          "format": "uri"
        },
        "type": {
          "type": "string"
        },
        "nonce": {
          "type": "string"
        },
        "domain": {
          "type": "string"
        },
        "address": {
          "type": "string"
        },
        "chainId": {
          "type": "string"
        },
        "version": {
          "type": "string"
        },
        "issuedAt": {
          "type": "string",
          "format": "date-time"
        },
        "notBefore": {
          "type": "string",
          "format": "date-time"
        },
        "requestId": {
          "type": "string"
        },
        "resources": {
          "type": "array",
          "items": {
            "type": "string",
            "format": "uri"
          }
        },
        "signature": {
          "type": "string"
        },
        "statement": {
          "type": "string"
        },
        "expirationTime": {
          "type": "string",
          "format": "date-time"
        }
      }
    },
    "supportedChains": [
      {
        "type": "eip191",
        "chainId": "eip155:8453"
      }
    ]
  }
}

Provenance

Seen in the source catalog
2026-08-14 22:34Z
Last indexed by Roundhouse
2026-09-13 22:30Z
Last enriched (probe, favicon, geo)
2026-09-20 13:15Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 405
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

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 21 snapshots so far. 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.blog/api/answer, 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.