Find better alternatives to an x402 endpoint
Find better alternatives to an x402 endpoint. Given a resource URL, returns the top semantically-similar endpoints (matched on advertised purpose via description embeddings) that currently OUT-SCORE it on our deterministic trust score — so an agent about to pay a mediocre endpoint can discover a more reliable, better-settled one serving the same function. Each result carries its trust score, grade, cosine similarity, advertised price and free endpoint-page URL. The price fields stay machine-readable: amountUsd is always the raw advertised amount, and the separate boolean priceCeiling is true when the endpoint uses the x402 'upto' scheme, i.e. amountUsd is an authorization ceiling and the real charge is typically lower. Same-host siblings and 'avoid'-flagged endpoints are excluded. Returns an empty list (still a valid answer) when nothing beats the subject.
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402-trust.com/v1/similar
| Category | Market data |
|---|---|
| Provider host | x402-trust.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 356 ms |
Example input (from the provider)
{
"body": {
"limit": 5,
"resource": "https://api.example.com/v1/thing"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"limit": {
"type": "integer"
},
"resource": {
"type": "string"
}
},
"required": [
"resource",
"limit"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
]
},
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
]
},
"type": {
"const": "http"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"alternatives": {
"items": {
"properties": {
"amountUsd": {
"type": "number"
},
"endpointPage": {
"type": "string"
},
"grade": {
"type": "string"
},
"network": {
"type": "string"
},
"priceCeiling": {
"type": "boolean"
},
"recommendation": {
"type": "string"
},
"resource": {
"type": "string"
},
"score": {
"type": "number"
},
"similarity": {
"type": "number"
}
},
"required": [
"resource",
"score",
"grade",
"recommendation",
"similarity",
"amountUsd",
"priceCeiling",
"network",
"endpointPage"
],
"type": "object"
},
"type": "array"
},
"count": {
"type": "integer"
},
"note": {
"type": "string"
},
"resource": {
"type": "string"
},
"subject": {
"properties": {
"grade": {
"type": "string"
},
"inObservationSet": {
"type": "boolean"
},
"score": {
"type": "number"
},
"vectorized": {
"type": "boolean"
}
},
"required": [
"score",
"grade",
"inObservationSet",
"vectorized"
],
"type": "object"
}
},
"required": [
"resource",
"subject",
"count",
"alternatives",
"note"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}