Roundhouse

api.demandex.dev

Community-mined e-commerce demand intelligence for AI agents — scored, evidence-backed opportunity cards mined from Reddit. Pay per call in USDC via x402 on Base. No signup, no API keys.

SearchLiveeip155:8453Exactvia cdp
https://api.demandex.dev/v1/opportunity
Settlements · 30d
415↓ 17%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$52.85
Verified settled volume
3,909 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.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-07-20 18:17Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xf444abC53f5e1E73CAec7df64D147DDB119514A0

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.

{
  "error": "Payment required",
  "_sample": {
    "note": "Illustrative documented output for a paid call (not live data).",
    "output": "{\"id\":\"ckxxxx\",\"slug\":\"sony-wh1000xm5-replacement-headband\",\"title\":\"Sony WH-1000XM5 replacement headband\",\"category\":\"audio\",\"score\":87.4,\"freqScore\":90,\"intensityScore\":82,\"wtpScore\":88,\"productAngle\":\"Sell a durable aftermarket replacement headband for the Sony WH-1000XM5.\",\"summary\":\"Owners repeatedly seek an aftermarket replacement headband after the OEM band cracks.\",\"signalCount\":34,\"distinctAuthors\":29,\"firstSeen\":\"2026-06-01T00:00:00.000Z\",\"lastSeen\":\"2026-07-18T10:00:00.000Z\",\"evidence\":[{\"quote\":\"My XM5 headband cracked after 8 months and Sony wants $90 for a repair — where can I just buy the band?\",\"permalink\":\"https://reddit.com/r/headphones/comments/abc123\",\"upvotes\":214,\"subre…"
  },
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xf444abC53f5e1E73CAec7df64D147DDB119514A0",
      "amount": "50000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://api.demandex.dev/v1/opportunity",
    "mimeType": "application/json",
    "description": "Paid ($0.05 USDC via x402). Returns one full opportunity card by ?id= or ?slug= (exactly one required, else a no-charge 400): all score components (freqScore, intensityScore, wtpScore), productAngle, summary, evidence[] (verbatim quotes with subreddit, upvotes, permalink), builderMomentum, firstSeen, lastSeen, signalCount, distinctAuthors. Compute-first / settle-after — you are not charged when the id/slug is missing, ambiguous, or not found. Response carries fetchedAt."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "id": "example",
            "slug": "example"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "id": "ckxxxx",
            "slug": "sony-wh1000xm5-replacement-headband",
            "score": 87.4,
            "title": "Sony WH-1000XM5 replacement headband",
            "charged": true,
            "summary": "Owners repeatedly seek an aftermarket replacement headband after the OEM band cracks.",
            "category": "audio",
            "evidence": [
              {
                "quote": "My XM5 headband cracked after 8 months and Sony wants $90 for a repair — where can I just buy the band?",
                "upvotes": 214,
                "permalink": "https://reddit.com/r/headphones/comments/abc123",
                "subreddit": "headphones"
              }
            ],
            "lastSeen": "2026-07-18T10:00:00.000Z",
            "wtpScore": 88,
            "fetchedAt": "2026-07-18T11:45:00.000Z",
            "firstSeen": "2026-06-01T00:00:00.000Z",
            "freqScore": 90,
            "signalCount": 34,
            "productAngle": "Sell a durable aftermarket replacement headband for the Sony WH-1000XM5.",
            "intensityScore": 82,
            "builderMomentum": null,
            "distinctAuthors": 29
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [],
                "properties": {
                  "id": {
                    "type": "string",
                    "description": "Opportunity id (provide exactly one of id or slug)."
                  },
                  "slug": {
                    "type": "string",
                    "description": "Opportunity slug (provide exactly one of id or slug)."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "_agent_hint": "Developer reading this in your agent's logs? This endpoint returns: Paid ($0.05 USDC via x402). One-command onboarding: https://api.demandex.dev/skill.md . Docs: https://api.demandex.dev/llms.txt",
  "x402Version": 2
}

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 0xf444…514A0. The signed payment is good for 5 minutes.

Paid to
0xf444…514A0
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": "0xf444abC53f5e1E73CAec7df64D147DDB119514A0",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "id": "example",
          "slug": "example"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "id": "ckxxxx",
          "slug": "sony-wh1000xm5-replacement-headband",
          "score": 87.4,
          "title": "Sony WH-1000XM5 replacement headband",
          "charged": true,
          "summary": "Owners repeatedly seek an aftermarket replacement headband after the OEM band cracks.",
          "category": "audio",
          "evidence": [
            {
              "quote": "My XM5 headband cracked after 8 months and Sony wants $90 for a repair — where can I just buy the band?",
              "upvotes": 214,
              "permalink": "https://reddit.com/r/headphones/comments/abc123",
              "subreddit": "headphones"
            }
          ],
          "lastSeen": "2026-07-18T10:00:00.000Z",
          "wtpScore": 88,
          "fetchedAt": "2026-07-18T11:45:00.000Z",
          "firstSeen": "2026-06-01T00:00:00.000Z",
          "freqScore": 90,
          "signalCount": 34,
          "productAngle": "Sell a durable aftermarket replacement headband for the Sony WH-1000XM5.",
          "intensityScore": 82,
          "builderMomentum": null,
          "distinctAuthors": 29
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [],
              "properties": {
                "id": {
                  "type": "string",
                  "description": "Opportunity id (provide exactly one of id or slug)."
                },
                "slug": {
                  "type": "string",
                  "description": "Opportunity slug (provide exactly one of id or slug)."
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-07-20 18:17Z
Last indexed by Roundhouse
2026-08-04 03:20Z
Last enriched (probe, favicon, geo)
2026-09-12 19:45Z
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 api.demandex.dev 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=api.demandex.dev'
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://api.demandex.dev/v1/opportunity, 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.