vellum.totemworks.workers.dev

Name: vellum.totemworks.workers.dev
Price: 0.015 USDC
Availability: InStock

Search ClinicalTrials.gov and return a short study list.

SearchLiveeip155:8453Exactvia facilitator:payAI

https://vellum.totemworks.workers.dev/api/trials/search

Settlements · 30d

4↓ 100%

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.

$5.05

Verified settled volume

4 settlements proven x402 by their on-chain EIP-3009 marker.

$0.015

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

0x428f6223e269621aE6B0B3Ad8e1e608c2E494C95

The wallet the 402 directs payment to. Its full payment record 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.

Recent payments · which agents last used it

Every indexed settlement paid to this service’s wallet, newest first. The index does not record which endpoint a payment was for, so if this wallet serves more than one endpoint, the rows include payments for the others. Paged up to the newest 5,000; the full history is on the merchant page.

Payer Payee	Chain	Amount	x402	Route	Age	Txn hash
0xa1d1…19780x428f…4c95	Base	$0.02	100%	payAI	6d ago	0x8cb199…f8dc14
0xaecb…94380x428f…4c95	Base	$5.00	100%	payAI	7d ago	0xc3cd16…a66a57
0xaecb…94380x428f…4c95	Base	$0.02	100%	payAI	7d ago	0xccffb3…acc2fb
0xaecb…94380x428f…4c95	Base	$0.02	100%	payAI	7d ago	0x9a7826…fcdf32

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",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x428f6223e269621aE6B0B3Ad8e1e608c2E494C95",
      "amount": "15000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://vellum.totemworks.workers.dev/api/trials/search",
      "description": "Search ClinicalTrials.gov and return a short study list.",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://vellum.totemworks.workers.dev/api/trials/search",
    "mimeType": "application/json",
    "description": "Search ClinicalTrials.gov and return a short study list."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "q": "semaglutide",
            "phase": "ANY",
            "status": "RECRUITING"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "price": "$0.015",
            "total": 0,
            "studies": []
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "queryParams"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "q"
                ],
                "properties": {
                  "q": {
                    "type": "string",
                    "description": "Drug, condition, or keyword. At least 2 characters."
                  },
                  "phase": {
                    "enum": [
                      "ANY",
                      "PHASE1",
                      "PHASE2",
                      "PHASE3",
                      "PHASE4"
                    ],
                    "type": "string",
                    "default": "ANY"
                  },
                  "status": {
                    "enum": [
                      "RECRUITING",
                      "ANY"
                    ],
                    "type": "string",
                    "default": "RECRUITING"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "facilitator": "https://facilitator.payai.network",
  "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.

0.015USDC≈ $0.015 USD

on Base · exact scheme

Pay 0.015 USDC on Base to 0x428f…94C95. The signed payment is good for 5 minutes.

Paid to: 0x428f…94C95
USD Coin contract: 0x8335…02913
Payment window: 5 minutes
As published: 15000 smallest units

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x428f6223e269621aE6B0B3Ad8e1e608c2E494C95",
    "amount": "15000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "q": "semaglutide",
          "phase": "ANY",
          "status": "RECRUITING"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "price": "$0.015",
          "total": 0,
          "studies": []
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "queryParams"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [
                "q"
              ],
              "properties": {
                "q": {
                  "type": "string",
                  "description": "Drug, condition, or keyword. At least 2 characters."
                },
                "phase": {
                  "enum": [
                    "ANY",
                    "PHASE1",
                    "PHASE2",
                    "PHASE3",
                    "PHASE4"
                  ],
                  "type": "string",
                  "default": "ANY"
                },
                "status": {
                  "enum": [
                    "RECRUITING",
                    "ANY"
                  ],
                  "type": "string",
                  "default": "RECRUITING"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-11-06 04:18Z
Last indexed by Roundhouse: 2026-11-12 19:45Z
Last enriched (probe, favicon, geo): 2026-11-06 17:46Z
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 vellum.totemworks.workers.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=vellum.totemworks.workers.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://vellum.totemworks.workers.dev/api/trials/search, 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.