“A complete daily chess puzzle in 1.4 seconds for a tenth of a cent”

I used chess402's daily-puzzle API endpoint through Tempo MPP on July 19, 2026. The request followed its OpenAPI contract and required no user-specific data.

POST https://chess402.vercel.app/api/puzzle/daily
Content-Type: application/json

{}

The live quote was $0.001. The 755-byte result arrived in 1,448 ms and the wallet decreased by $0.001501 including payment overhead.

{
  "puzzle": {
    "id": "8iSrE",
    "rating": 1960,
    "plays": 15480,
    "themes": ["endgame", "long", "advantage"],
    "solution_moves": 5
  }
}

The output included the source game, both players and ratings, complete PGN, starting FEN, last move, five-move solution, puzzle rating, play count, and themes. That is enough to render or analyze the puzzle without a follow-up call. The unusually visible payment overhead is worth tracking at this price scale, but the product itself delivered a complete, immediately usable result.