Chess Daily answer check — legally validates a complete UCI principal line again
Chess Daily answer check — legally validates a complete UCI principal line against the pinned daily puzzle.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
628 msmedian answer time
$0.005listed price per call
$0.005price it asked us
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://agent-arcade.use.x402atlas.com/chess/check
| Category | Everything else |
|---|---|
| Provider host | agent-arcade.use.x402atlas.com |
| Networks | eip155:137, eip155:42161, eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 4 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 | $0.005 | 628 ms |
Example input (from the provider)
{
"body": {
"answer": {
"moves": [
"d1h5",
"h7h6",
"h5c5"
]
},
"challenge_id": "sha256:50697ebea7b2cc5947da85e12fe2069f49983c4ba3d206b09540d80733c0153a",
"date": "2026-07-01",
"difficulty": "normal",
"generation_version": "v1"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"description": "Chess Daily answer-check request using the identity and complete UCI line for a daily puzzle.",
"properties": {
"answer": {
"additionalProperties": false,
"description": "Proposed Chess Daily principal line.",
"properties": {
"moves": {
"description": "Complete Chess Daily principal line as legal UCI moves.",
"items": {
"pattern": "^[a-h][1-8][a-h][1-8][qrbn]?$",
"type": "string"
},
"maxItems": 16,
"type": "array"
}
},
"required": [
"moves"
],
"type": "object"
},
"challenge_id": {
"description": "Chess Daily challenge_id copied from the daily envelope.",
"pattern": "^sha256:[0-9a-f]{64}$",
"type": "string"
},
"date": {
"description": "UTC date of the referenced Chess Daily challenge.",
"format": "date",
"type": "string"
},
"difficulty": {
"description": "Difficulty of the referenced Chess Daily challenge.",
"enum": [
"normal"
],
"type": "string"
},
"generation_version": {
"description": "Chess Daily dataset-selection version copied from the daily envelope.",
"enum": [
"v1"
],
"type": "string"
}
},
"required": [
"challenge_id",
"generation_version",
"date",
"difficulty",
"answer"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"description": "Chess Daily answer-check legality and principal-line verdict.",
"properties": {
"challenge_id": {
"description": "Checked Chess Daily challenge identity.",
"type": "string"
},
"correct": {
"description": "Whether the complete Chess Daily principal line matches.",
"type": "boolean"
},
"feedback": {
"additionalProperties": false,
"description": "Chess Daily move legality and line-length feedback.",
"properties": {
"first_invalid_move": {
"type": [
"integer",
"null"
]
},
"message": {
"type": "string"
},
"required_moves": {
"type": "integer"
},
"submitted_moves": {
"type": "integer"
}
},
"required": [
"message",
"first_invalid_move",
"submitted_moves",
"required_moves"
],
"type": "object"
},
"game": {
"description": "Chess Daily game identity.",
"enum": [
"chess"
],
"type": "string"
},
"proof": {
"additionalProperties": false,
"description": "Present only after a correct Chess Daily answer.",
"properties": {
"normalized_line": {
"items": {
"type": "string"
},
"type": "array"
}
},
"required": [
"normalized_line"
],
"type": "object"
},
"score": {
"description": "Informational Chess Daily score: 100 when correct, otherwise 0.",
"type": "integer"
},
"valid": {
"description": "Whether every submitted Chess Daily move is legal.",
"type": "boolean"
}
},
"required": [
"challenge_id",
"game",
"valid",
"correct",
"score",
"feedback"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}