trials-search
Search ClinicalTrials.gov by indication, company, molecule or free text and get a ranked list of normalized trial records with total count and on-page facet summary. Optional phase, status, study-type and country filters. A cheap first step before /trials/study or /trials/pipeline.
SearchLiveeip155:8453Exactvia cdp
Clinical-trialsClinicaltrials-govSearchIndicationSponsor
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 24 snapshots so far.
$42.97
Verified settled volume
3,793 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.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-17 09:48Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493The 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": "0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493",
"amount": "15000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.agentstools.dev/trials/search",
"tags": [
"clinical-trials",
"clinicaltrials-gov",
"search",
"indication",
"sponsor",
"drug",
"molecule",
"pharma",
"biotech",
"pipeline",
"discovery"
],
"mimeType": "application/json",
"description": "Search ClinicalTrials.gov by indication, company, molecule or free text and get a ranked list of normalized trial records with total count and on-page facet summary. Optional phase, status, study-type and country filters. A cheap first step before /trials/study or /trials/pipeline.",
"serviceName": "trials-search"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"cond": "lung cancer",
"phase": "3",
"status": "recruiting"
}
},
"output": {
"type": "json",
"example": {
"query": {
"cond": "lung cancer",
"phase": "3"
},
"results": [
{
"title": "A Phase 3 NSCLC Study",
"nct_id": "NCT00000000",
"phases": [
"Phase 3"
],
"status": "recruiting",
"enrollment": 600,
"lead_sponsor": "Example Pharma",
"primary_completion_date": "2027-06-30"
}
],
"returned": 1,
"attribution": [
"Source: ClinicalTrials.gov (U.S. National Library of Medicine, NIH)"
],
"total_count": 1380,
"facets_on_page": {
"by_phase": {
"Phase 3": 1
},
"by_status": {
"recruiting": 1
}
}
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"cond": {
"type": "string",
"description": "Condition, indication or disease"
},
"intr": {
"type": "string",
"description": "Intervention, drug or molecule name"
},
"lead": {
"type": "string",
"description": "Lead sponsor name"
},
"term": {
"type": "string",
"description": "Free-text other terms"
},
"phase": {
"enum": [
"0",
"1",
"2",
"3",
"4"
],
"type": "string",
"description": "Trial phase to filter by, where 0 is Early Phase 1"
},
"spons": {
"type": "string",
"description": "Sponsor or collaborator name"
},
"status": {
"enum": [
"recruiting",
"not_yet_recruiting",
"active_not_recruiting",
"completed",
"terminated",
"withdrawn",
"suspended"
],
"type": "string",
"description": "Overall recruitment status to filter by"
},
"titles": {
"type": "string",
"description": "Title or acronym terms"
},
"country": {
"type": "string",
"description": "Country to narrow trial sites"
},
"page_size": {
"type": "integer",
"maximum": 50,
"minimum": 1,
"description": "Max records to return, default 10"
},
"study_type": {
"enum": [
"int",
"obs",
"exp"
],
"type": "string",
"description": "Study type: int interventional, obs observational, exp expanded access"
}
}
}
},
"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.
0.015USDC≈ $0.015 USD
on Base · exact scheme
Pay 0.015 USDC on Base to 0xF22e…Ff493. The signed payment is good for 5 minutes.
- Paid to
- 0xF22e…Ff493
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 15000 smallest units
15000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xF22e…Ff493
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
15000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xF22e…Ff493
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
15000units
on eip155:480 · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xF22e…Ff493
- Token contract
- 0x79A0…D24D1
- Payment window
- 5 minutes
15000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- AytHnv…Z8R1u
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493",
"amount": "15000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493",
"amount": "15000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493",
"amount": "15000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 300
},
{
"asset": "0x79A02482A880bCe3F13E09da970dC34dB4cD24D1",
"extra": {
"name": "USDC",
"version": "2"
},
"payTo": "0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493",
"amount": "15000",
"scheme": "exact",
"network": "eip155:480",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
},
"payTo": "AytHnvc6bZx1ALTy7b5Px7hcavoSYszG9aeKvDcZ8R1u",
"amount": "15000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"cond": "lung cancer",
"phase": "3",
"status": "recruiting"
}
},
"output": {
"type": "json",
"example": {
"query": {
"cond": "lung cancer",
"phase": "3"
},
"results": [
{
"title": "A Phase 3 NSCLC Study",
"nct_id": "NCT00000000",
"phases": [
"Phase 3"
],
"status": "recruiting",
"enrollment": 600,
"lead_sponsor": "Example Pharma",
"primary_completion_date": "2027-06-30"
}
],
"returned": 1,
"attribution": [
"Source: ClinicalTrials.gov (U.S. National Library of Medicine, NIH)"
],
"total_count": 1380,
"facets_on_page": {
"by_phase": {
"Phase 3": 1
},
"by_status": {
"recruiting": 1
}
}
}
}
},
"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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"cond": {
"type": "string",
"description": "Condition, indication or disease"
},
"intr": {
"type": "string",
"description": "Intervention, drug or molecule name"
},
"lead": {
"type": "string",
"description": "Lead sponsor name"
},
"term": {
"type": "string",
"description": "Free-text other terms"
},
"phase": {
"enum": [
"0",
"1",
"2",
"3",
"4"
],
"type": "string",
"description": "Trial phase to filter by, where 0 is Early Phase 1"
},
"spons": {
"type": "string",
"description": "Sponsor or collaborator name"
},
"status": {
"enum": [
"recruiting",
"not_yet_recruiting",
"active_not_recruiting",
"completed",
"terminated",
"withdrawn",
"suspended"
],
"type": "string",
"description": "Overall recruitment status to filter by"
},
"titles": {
"type": "string",
"description": "Title or acronym terms"
},
"country": {
"type": "string",
"description": "Country to narrow trial sites"
},
"page_size": {
"type": "integer",
"maximum": 50,
"minimum": 1,
"description": "Max records to return, default 10"
},
"study_type": {
"enum": [
"int",
"obs",
"exp"
],
"type": "string",
"description": "Study type: int interventional, obs observational, exp expanded access"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-17 09:48Z
- Last indexed by Roundhouse
- 2026-09-16 09:50Z
- Last enriched (probe, favicon, geo)
- 2026-09-22 01:15Z
- 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. 24 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 trials-search 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=trials-search' 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.agentstools.dev/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. 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.