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Chess Notation Tools – PGN Header Parser & Validator
x402
Chess Notation Tools – PGN Header Parser & Validator is a paid API for AI agents from chess-notation.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Parses PGN tag pairs, validates the Seven Tag Roster, checks result token and date format, and counts moves in the movetext.
Price / call$0.02
Success—
StatusUnknown
How this service works
Parse PGN tag pairs, check the Seven Tag Roster, result token and date format, and count the moves in the movetext.
Output
Returns a structured object containing: extracted tag key-value pairs (Event, Site, Date, White, Black, Round, Result), total tag count, list of missing Seven Tag Roster tags, a boolean indicating whether the Seven Tag Roster is complete, the result token found in the movetext, full and half move counts, first few moves, a validation verdict (pass/fail/warn), human-readable reasons for any issues, a summary string, and flags for degraded service or unchecked fields.
Example use cases
Validate PGN before database import
“Before I store this PGN game in my database, check if all Seven Tag Roster tags are present and the date and result tokens are valid: '[Event "London Classic"][Site "London ENG"][Date "2023.12.09"][Round "3"][White "So, Wesley"][Black "Anand, Viswanathan"][Result "1/2-1/2"] 1. d4 d5 1/2-1/2'”
Count moves in uploaded game
“I have a PGN game someone submitted to my chess tournament site — can you tell me how many full moves and half moves are in it, and whether the result in the movetext matches the header? Here's the PGN: '[Event "Club Championship"][Site "??"][Date "2024.03.15"][Round "2"][White "Smith, J"][Black "Jones, T"][Result "1-0"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 1-0'”
Find missing roster tags in PGN
“Can you check this PGN snippet and tell me which of the Seven Tag Roster tags are missing? '[Event "Open"][Date "2024.05.???"][White "Adams"][Result "*"] 1. e4'”
Technical details
Endpoint
GEThttps://chess-notation.x402tookit.com/pgn-headers?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to validate or extract structured metadata from PGN chess game headers — especially to check Seven Tag Roster completeness, verify date/result format compliance, or count moves before storing or displaying a game. Prefer this over general text parsing when working specifically with PGN-formatted chess data.
Side effects
- PGN string exceeds 6000 character limit — request rejected
- Malformed or empty PGN input causes null fields in output
- PGN with no tag pairs returns empty tags object and missing roster tags list
- Non-standard or custom tag names may not be checked against the Seven Tag Roster
- Ambiguous or missing result token returns null resultInMovetext
- Payment failure (x402) prevents call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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