x402-domain-check.vercel.app
Clinical trials search (ClinicalTrials.gov, NLM): filter by condition, intervention/drug, sponsor, status, location. Returns NCT id, title, status, phase, conditions, interventions, sponsor, enrollment, dates, locations summary, link. Not charged on errors.
SearchLiveeip155:8453Exactvia cdp
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 14 snapshots so far.
$0.59
Verified settled volume
26 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-27 09:42Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x94D642596761470161B37771FAC222111A5FfAd6The 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",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x94D642596761470161B37771FAC222111A5FfAd6",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://x402-domain-check.vercel.app/trials/search",
"mimeType": "application/json",
"description": "Clinical trials search (ClinicalTrials.gov, NLM): filter by condition, intervention/drug, sponsor, status, location. Returns NCT id, title, status, phase, conditions, interventions, sponsor, enrollment, dates, locations summary, link. Not charged on errors."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"limit": 5,
"status": "RECRUITING",
"condition": "melanoma",
"intervention": "pembrolizumab"
}
},
"output": {
"type": "json",
"example": {
"source": {
"name": "ClinicalTrials.gov",
"attribution": "Data from ClinicalTrials.gov (U.S. National Library of Medicine)",
"dataTimestamp": "2026-10-26T09:00:00"
},
"studies": [
{
"url": "https://clinicaltrials.gov/study/NCT04594187",
"nctId": "NCT04594187",
"phase": [
"PHASE2"
],
"title": "Nodal Radiation Therapy for Sentinel Lymph Node Positive Melanoma",
"status": "RECRUITING",
"sponsor": "M.D. Anderson Cancer Center",
"locations": {
"count": 1,
"sample": [
"M D Anderson Cancer Center, Houston, Texas, United States"
],
"countries": [
"United States"
]
},
"startDate": "2020-08-07",
"conditions": [
"Melanoma"
],
"enrollment": {
"type": "ESTIMATED",
"count": 100
},
"interventions": [
{
"name": "Pembrolizumab",
"type": "DRUG"
}
],
"completionDate": "2027-12-31",
"primaryCompletionDate": "2027-12-31"
}
],
"returned": 1,
"totalCount": 70
}
}
},
"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",
"properties": {
"limit": {
"type": "integer",
"default": 10,
"maximum": 50,
"minimum": 1
},
"status": {
"type": "string",
"description": "Comma-separated overall statuses: RECRUITING, NOT_YET_RECRUITING, ACTIVE_NOT_RECRUITING, ENROLLING_BY_INVITATION, COMPLETED, TERMINATED, SUSPENDED, WITHDRAWN, UNKNOWN"
},
"sponsor": {
"type": "string",
"description": "Sponsor / collaborator name"
},
"location": {
"type": "string",
"description": "City, state, country or facility"
},
"condition": {
"type": "string",
"description": "Disease/condition keywords"
},
"intervention": {
"type": "string",
"description": "Drug / intervention keywords"
}
},
"description": "At least one of condition, intervention, sponsor, location required"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"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.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0x94D6…FfAd6. The signed payment is good for 5 minutes.
- Paid to
- 0x94D6…FfAd6
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 20000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x94D642596761470161B37771FAC222111A5FfAd6",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"limit": 5,
"status": "RECRUITING",
"condition": "melanoma",
"intervention": "pembrolizumab"
}
},
"output": {
"type": "json",
"example": {
"source": {
"name": "ClinicalTrials.gov",
"attribution": "Data from ClinicalTrials.gov (U.S. National Library of Medicine)",
"dataTimestamp": "2026-10-26T09:00:00"
},
"studies": [
{
"url": "https://clinicaltrials.gov/study/NCT04594187",
"nctId": "NCT04594187",
"phase": [
"PHASE2"
],
"title": "Nodal Radiation Therapy for Sentinel Lymph Node Positive Melanoma",
"status": "RECRUITING",
"sponsor": "M.D. Anderson Cancer Center",
"locations": {
"count": 1,
"sample": [
"M D Anderson Cancer Center, Houston, Texas, United States"
],
"countries": [
"United States"
]
},
"startDate": "2020-08-07",
"conditions": [
"Melanoma"
],
"enrollment": {
"type": "ESTIMATED",
"count": 100
},
"interventions": [
{
"name": "Pembrolizumab",
"type": "DRUG"
}
],
"completionDate": "2027-12-31",
"primaryCompletionDate": "2027-12-31"
}
],
"returned": 1,
"totalCount": 70
}
}
},
"schema": {
"type": "object",
"$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",
"properties": {
"limit": {
"type": "integer",
"default": 10,
"maximum": 50,
"minimum": 1
},
"status": {
"type": "string",
"description": "Comma-separated overall statuses: RECRUITING, NOT_YET_RECRUITING, ACTIVE_NOT_RECRUITING, ENROLLING_BY_INVITATION, COMPLETED, TERMINATED, SUSPENDED, WITHDRAWN, UNKNOWN"
},
"sponsor": {
"type": "string",
"description": "Sponsor / collaborator name"
},
"location": {
"type": "string",
"description": "City, state, country or facility"
},
"condition": {
"type": "string",
"description": "Disease/condition keywords"
},
"intervention": {
"type": "string",
"description": "Drug / intervention keywords"
}
},
"description": "At least one of condition, intervention, sponsor, location required"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-27 09:42Z
- Last indexed by Roundhouse
- 2026-11-10 13:00Z
- Last enriched (probe, favicon, geo)
- 2026-11-01 15:46Z
- 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
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 14 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service x402-domain-check.vercel.app 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=x402-domain-check.vercel.app' 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://x402-domain-check.vercel.app/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.