chess402.vercel.app
Stockfish cloud evaluation for a FEN position. Returns depth, evaluation, and principal variation(s) when Lichess has the position cached.
Offering
- Provider
- chess402.vercel.app
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- General Utilities
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://chess402.vercel.app/api/cloud-eval- MIME type
- Not provided
- First seen
- 2026-10-16T01:58:03.323Z
- Last seen
- Tags
- None supplied
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "5000",
"payTo": "0xfbd46201267609ad3c66bd1b99b7f1cc80b1852f"
}
]Observed health
- Status
- Healthy
- Latest latency
- 70 ms
- Average latency
- 178 ms
- HTTP status
- 204
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"additionalProperties": false,
"properties": {
"body": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"description": "Cloud-eval request: FEN position to analyze plus options.",
"properties": {
"fen": {
"description": "Standard FEN position string, e.g. 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1'",
"maxLength": 100,
"minLength": 15,
"type": "string"
},
"multiPv": {
"description": "Number of principal variations to return (1-5). Default 1.",
"maximum": 5,
"minimum": 1,
"type": "integer"
},
"variant": {
"description": "Chess variant. Default 'standard'.",
"enum": [
"standard",
"chess960",
"crazyhouse",
"antichess",
"atomic",
"horde",
"kingOfTheHill",
"racingKings",
"threeCheck"
],
"type": "string"
}
},
"required": [
"fen"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}Output schema
{
"properties": {
"example": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": {},
"description": "Cloud-eval response: depth, knodes, and principal variations.",
"properties": {
"depth": {
"description": "Search depth in plies.",
"maximum": 9007199254740991,
"minimum": -9007199254740991,
"type": "integer"
},
"fen": {
"description": "Echoed FEN that was evaluated.",
"type": "string"
},
"knodes": {
"description": "Kilonodes searched.",
"maximum": 9007199254740991,
"minimum": -9007199254740991,
"type": "integer"
},
"pvs": {
"description": "Principal variations (one per multiPv).",
"items": {
"additionalProperties": {},
"properties": {
"cp": {
"description": "Evaluation in centipawns from the side-to-move POV.",
"maximum": 9007199254740991,
"minimum": -9007199254740991,
"type": "integer"
},
"mate": {
"description": "Mate-in-N from the side-to-move POV, when applicable.",
"maximum": 9007199254740991,
"minimum": -9007199254740991,
"type": "integer"
},
"moves": {
"description": "Space-separated UCI moves of the principal variation.",
"type": "string"
}
},
"required": [
"moves"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"fen",
"pvs"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}