x402.fuchss.app
Semantic search across the entire monitored x402 catalog. Given a free-text query (e.g. "weather forecast", "image generation", "EVM gas price oracle"), returns the closest endpoints by advertised purpose. Ranking is deterministic: cosine similarity bucketed to whole percentage points first (80.3% and 80.5% are the same bucket), then trust score, then described-before-undescribed, then endpoint id. Matches below a 0.5 cosine-similarity floor are dropped entirely, so a query can return fewer than the requested limit (or none). Endpoints that advertise no description are still matched: they are embedded from their service name and URL path tokens instead of a written description (host name as a last resort). The exact effect of a missing description: no fixed point deduction and no direct similarity malus; the only deterministic penalty is the described-before-undescribed tiebreak (at equal similarity bucket AND equal trust score, a described endpoint ranks first). Beyond that it is purely indirect: the shorter fallback text typically yields lower cosine similarity than a prose description, so such endpoints tend to land in lower similarity buckets, by a query-dependent amount. Each match carries its resource URL, trust score, grade, cosine similarity (0-1, raw value; ranking buckets it), advertised description when present, and a free endpoint-page URL. Matches also carry the advertised price as machine-readable fields: amountUsd (null when not advertised) and priceCeiling (true when the endpoint uses the x402 'upto' scheme, i.e. amountUsd is an authorization ceiling and the real charge is typically lower). This is a DISCOVERY product: it deliberately carries no verdict, recommendation or flag detail (the per-endpoint trust report sold at /v1/x402-trust carries those). The query is embedded with the same model as the catalog, so phrasing the capability you need works better than guessing keywords.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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": "0xbBECBE90F28632a9d52ed67b33b43767b8c89285",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"outputSchema": {
"input": {
"type": "http",
"method": "POST",
"bodyType": "json",
"bodyFields": {
"limit": {
"type": "number",
"required": false,
"description": "Max matches to return (1-25, default 25)."
},
"query": {
"type": "string",
"required": true,
"description": "Free-text search query (1-500 chars). Describe the capability you need in plain words."
}
},
"headerFields": {
"PAYMENT-SIGNATURE": {
"type": "string",
"required": true,
"description": "Base64-encoded JSON PaymentPayload; auto-filled by x402 clients."
}
}
},
"output": {
"count": "number",
"query": "string",
"matches": "array"
}
},
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://x402-trust.com/v1/semantic-search",
"tags": [
"x402",
"trust",
"reliability",
"monitoring",
"uptime",
"agents"
],
"iconUrl": "https://x402-trust.com/favicon.svg",
"mimeType": "application/json",
"description": "Semantic search across the entire monitored x402 catalog. Given a free-text query (e.g. \"weather forecast\", \"image generation\", \"EVM gas price oracle\"), returns the closest endpoints by advertised purpose. Ranking is deterministic: cosine similarity bucketed to whole percentage points first (80.3% and 80.5% are the same bucket), then trust score, then described-before-undescribed, then endpoint id. Matches below a 0.5 cosine-similarity floor are dropped entirely, so a query can return fewer than the requested limit (or none). Endpoints that advertise no description are still matched: they are embedded from their service name and URL path tokens instead of a written description (host name as a last resort). The exact effect of a missing description: no fixed point deduction and no direct similarity malus; the only deterministic penalty is the described-before-undescribed tiebreak (at equal similarity bucket AND equal trust score, a described endpoint ranks first). Beyond that it is purely indirect: the shorter fallback text typically yields lower cosine similarity than a prose description, so such endpoints tend to land in lower similarity buckets, by a query-dependent amount. Each match carries its resource URL, trust score, grade, cosine similarity (0-1, raw value; ranking buckets it), advertised description when present, and a free endpoint-page URL. Matches also carry the advertised price as machine-readable fields: amountUsd (null when not advertised) and priceCeiling (true when the endpoint uses the x402 'upto' scheme, i.e. amountUsd is an authorization ceiling and the real charge is typically lower). This is a DISCOVERY product: it deliberately carries no verdict, recommendation or flag detail (the per-endpoint trust report sold at /v1/x402-trust carries those). The query is embedded with the same model as the catalog, so phrasing the capability you need works better than guessing keywords.",
"providerUrl": "https://x402-trust.com",
"serviceName": "x402 Trust: trust & reliability data for x402 endpoints"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"limit": 25,
"query": "weather forecast"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"note": "Ranked by cosine similarity, with trust score as a tiebreaker. score/grade are null when the endpoint is not yet scored. No verdict or flag detail here: POST /v1/x402-trust carries those.",
"count": 2,
"query": "weather forecast",
"matches": [
{
"id": 12345,
"grade": "A",
"score": 88.1,
"resource": "https://api.weather.example/v1/forecast",
"amountUsd": 0.002,
"similarity": 0.912,
"description": "Hyperlocal weather forecasts, priced per call.",
"endpointPage": "https://x402-trust.com/endpoint/12345",
"priceCeiling": false
},
{
"id": 12399,
"grade": null,
"score": null,
"resource": "https://wx.example.net/api/now",
"amountUsd": null,
"similarity": 0.874,
"description": null,
"endpointPage": "https://x402-trust.com/endpoint/12399",
"priceCeiling": false
}
],
"generatedAt": 1782826208450
}
}
},
"tags": [
"x402",
"search",
"semantic",
"discovery"
],
"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": [
"query",
"limit"
],
"properties": {
"limit": {
"type": "integer"
},
"query": {
"type": "string"
}
}
},
"type": {
"const": "http"
},
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
]
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"query",
"generatedAt",
"count",
"matches",
"note"
],
"properties": {
"note": {
"type": "string"
},
"count": {
"type": "integer"
},
"query": {
"type": "string"
},
"matches": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"resource",
"score",
"grade",
"similarity",
"amountUsd",
"priceCeiling",
"description",
"endpointPage"
],
"properties": {
"id": {
"type": "integer"
},
"grade": {
"type": [
"null",
"string"
]
},
"score": {
"type": [
"null",
"number"
]
},
"resource": {
"type": "string"
},
"amountUsd": {
"type": [
"null",
"number"
]
},
"similarity": {
"type": "number"
},
"description": {
"type": [
"null",
"string"
]
},
"endpointPage": {
"type": "string"
},
"priceCeiling": {
"type": "boolean"
}
}
}
},
"generatedAt": {
"type": "integer"
}
}
}
}
}
}
},
"category": "data",
"discoverable": true
}
},
"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.
Pay 0.001 USDC on Base to 0xbBEC…89285. The signed payment is good for 2 minutes.
- Paid to
- 0xbBEC…89285
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xbBECBE90F28632a9d52ed67b33b43767b8c89285",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"outputSchema": {
"input": {
"type": "http",
"method": "POST",
"bodyType": "json",
"bodyFields": {
"limit": {
"type": "number",
"required": false,
"description": "Max matches to return (1-25, default 25)."
},
"query": {
"type": "string",
"required": true,
"description": "Free-text search query (1-500 chars). Describe the capability you need in plain words."
}
},
"headerFields": {
"PAYMENT-SIGNATURE": {
"type": "string",
"required": true,
"description": "Base64-encoded JSON PaymentPayload; auto-filled by x402 clients."
}
}
},
"output": {
"count": "number",
"query": "string",
"matches": "array"
}
},
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"limit": 25,
"query": "weather forecast"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"note": "Ranked by cosine similarity, with trust score as a tiebreaker. score/grade are null when the endpoint is not yet scored. No verdict or flag detail here: POST /v1/x402-trust carries those.",
"count": 2,
"query": "weather forecast",
"matches": [
{
"id": 12345,
"grade": "A",
"score": 88.1,
"resource": "https://api.weather.example/v1/forecast",
"amountUsd": 0.002,
"similarity": 0.912,
"description": "Hyperlocal weather forecasts, priced per call.",
"endpointPage": "https://x402.fuchss.app/endpoint/12345",
"priceCeiling": false
},
{
"id": 12399,
"grade": null,
"score": null,
"resource": "https://wx.example.net/api/now",
"amountUsd": null,
"similarity": 0.874,
"description": null,
"endpointPage": "https://x402.fuchss.app/endpoint/12399",
"priceCeiling": false
}
],
"generatedAt": 1782826208450
}
}
},
"tags": [
"x402",
"search",
"semantic",
"discovery"
],
"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": [
"query",
"limit"
],
"properties": {
"limit": {
"type": "integer"
},
"query": {
"type": "string"
}
}
},
"type": {
"const": "http"
},
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
]
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"query",
"generatedAt",
"count",
"matches",
"note"
],
"properties": {
"note": {
"type": "string"
},
"count": {
"type": "integer"
},
"query": {
"type": "string"
},
"matches": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"resource",
"score",
"grade",
"similarity",
"amountUsd",
"priceCeiling",
"description",
"endpointPage"
],
"properties": {
"id": {
"type": "integer"
},
"grade": {
"type": [
"null",
"string"
]
},
"score": {
"type": [
"null",
"number"
]
},
"resource": {
"type": "string"
},
"amountUsd": {
"type": [
"null",
"number"
]
},
"similarity": {
"type": "number"
},
"description": {
"type": [
"null",
"string"
]
},
"endpointPage": {
"type": "string"
},
"priceCeiling": {
"type": "boolean"
}
}
}
},
"generatedAt": {
"type": "integer"
}
}
}
}
}
}
},
"category": "data",
"discoverable": true
}
}Provenance
- Seen in the source catalog
- 2026-09-09 14:16Z
- Last indexed by Roundhouse
- 2026-09-13 12:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 09:15Z
- x402 version
- 2
- Max timeout
- 120s
- 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. 21 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.fuchss.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.fuchss.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.fuchss.app/v1/semantic-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.