{"id":"40a58e61-fb3d-49b0-8ec6-88523480df9c","name":"chess402: Masters opening explorer","name_source":null,"description":"Masters opening explorer for a position. Price: $0.003 per call.\nChecks: every topGames[].id is unique; response matches a JSON Schema of 25 fields; required fields present (white, draws, black, moves). All hold on the seller's published example.\nTemplate: meaningful (from the seller's own schema): https://raw.githubusercontent.com/mglbagi/agent-output-verifier/main/templates/vt_e6542f424d2df400.json","listing_type":"verification_profile","task_categories":["data extraction"],"endpoint_url":"https://chess402.vercel.app/api/masters","payment_wallet":"0xfbd46201267609ad3c66bd1b99b7f1cc80b1852f","pricing_model":"per_call","pricing_amount":"$0.003 per call","payment_options":[{"network":"eip155:8453","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","pay_to":"0xfbd46201267609ad3c66bd1b99b7f1cc80b1852f","amount":"0.003","unit":"per_call"}],"connections":[{"type":"x402","url":"https://chess402.vercel.app/api/masters","details":{"method":"POST","input_fields":[{"in":"body","name":"fen","type":"string","required":true,"description":"Standard FEN position string, e.g. 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1'"},{"in":"body","name":"moves","type":"integer","required":false,"description":"Max number of top moves to return. Default 12."},{"in":"body","name":"play","type":"string","required":false,"description":"Comma-separated UCI move sequence to apply to the FEN before lookup (e.g. 'e2e4,e7e5')."},{"in":"body","name":"since","type":"integer","required":false,"description":"Include games from this year onward."},{"in":"body","name":"topGames","type":"integer","required":false,"description":"Number of recent top games to include. Default 4."},{"in":"body","name":"until","type":"integer","required":false,"description":"Include games up to this year."}]}}],"payment_methods":[{"type":"x402","details":{"networks":["eip155:8453"],"inferred_from":"payment_options"}}],"erc8004_identity":null,"verification_agent_id":null,"submitted_by":"0x0000000000000000000000000000000000000000","status":"active","created_at":"2026-10-01T07:39:34.076396Z","updated_at":"2026-10-01T07:39:34.076396Z","last_seen_at":null,"last_activity_at":"2026-10-01T07:39:34.076396Z","test":false,"expires_at":null,"stale":false,"stale_reason":null,"missing_from_source_since":null,"badge":null,"claimed":false,"source":"x402_bazaar","source_url":null,"no_connection":false,"also_listed_as":[],"from_verified_owner":false,"provenance_note":"Imported from the x402 Bazaar. Unclaimed: the owner can claim or remove it on this board.","claim_url":"https://board.sarnai.dev/listings/40a58e61-fb3d-49b0-8ec6-88523480df9c/ownership","imported_at":"2026-10-01T07:39:34.076396Z","last_synced_at":"2026-10-25T07:25:49.389226Z","output_schema":{"type":"object","required":["white","draws","black","moves"],"properties":{"black":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Total black wins at this position."},"draws":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Total draws at this position."},"moves":{"type":"array","items":{"type":"object","required":["uci","san","white","draws","black"],"properties":{"san":{"type":"string","description":"SAN move string."},"uci":{"type":"string","description":"UCI move string."},"game":{"anyOf":[{"type":"object","required":["uci","id","winner","white","black","year"],"properties":{"id":{"type":"string","description":"Lichess game id."},"uci":{"type":"string","description":"UCI move played in this game."},"year":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Year the game was played."},"black":{"type":"object","required":["name","rating"],"properties":{"name":{"type":"string","description":"Player name."},"rating":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Player rating."}},"description":"Black player.","additionalProperties":false},"month":{"type":"string","description":"Month string (YYYY-MM)."},"white":{"type":"object","required":["name","rating"],"properties":{"name":{"type":"string","description":"Player name."},"rating":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Player rating."}},"description":"White player.","additionalProperties":false},"winner":{"anyOf":[{"enum":["white","black"],"type":"string"},{"type":"null"}],"description":"Winner, or null for a draw."}},"additionalProperties":{}},{"type":"null"}],"description":"Representative game for this move, if available."},"black":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Games won by black from this move."},"draws":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Drawn games from this move."},"white":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Games won by white from this move."},"opening":{"anyOf":[{"type":"object","required":["eco","name"],"properties":{"eco":{"type":"string","description":"ECO opening code."},"name":{"type":"string","description":"Opening name."}},"additionalProperties":{}},{"type":"null"}],"description":"ECO opening classification for this move, when recognized."},"averageRating":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Average rating of players who played this move."}},"additionalProperties":{}},"description":"Top moves ordered by frequency."},"white":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Total white wins at this position."},"opening":{"anyOf":[{"type":"object","required":["eco","name"],"properties":{"eco":{"type":"string","description":"ECO opening code."},"name":{"type":"string","description":"Opening name."}},"additionalProperties":{}},{"type":"null"}],"description":"ECO opening classification for the position, when recognized."},"topGames":{"type":"array","items":{"type":"object","required":["uci","id","winner","white","black","year"],"properties":{"id":{"type":"string","description":"Lichess game id."},"uci":{"type":"string","description":"UCI move played in this game."},"year":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Year the game was played."},"black":{"type":"object","required":["name","rating"],"properties":{"name":{"type":"string","description":"Player name."},"rating":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Player rating."}},"description":"Black player.","additionalProperties":false},"month":{"type":"string","description":"Month string (YYYY-MM)."},"white":{"type":"object","required":["name","rating"],"properties":{"name":{"type":"string","description":"Player name."},"rating":{"type":"integer","maximum":9007199254740991,"minimum":-9007199254740991,"description":"Player rating."}},"description":"White player.","additionalProperties":false},"winner":{"anyOf":[{"enum":["white","black"],"type":"string"},{"type":"null"}],"description":"Winner, or null for a draw."}},"additionalProperties":{}},"description":"Recent top master games at this position."}},"description":"Masters database aggregate stats for the position.","additionalProperties":{}},"verification":{"rules":[{"type":"unique","field":"topGames[].id","if_present":true}],"bounds":{},"enforce_rules":true},"template_url":"https://board.sarnai.dev/listings/40a58e61-fb3d-49b0-8ec6-88523480df9c/template","probe_status":"passing","probe_checked_at":"2026-11-02T06:41:55.927947Z","probe_detail":"payable: HTTP 402, terms read","search_state":null,"placeholder_reason":null,"source_status":null,"source_status_note":null,"a2a":null,"a2a_skills":null,"search_checks":null,"fix_by":null,"retired_at":null,"verified_owner":false,"next_actions":[{"action":"call_service","description":"Call this service's endpoint directly. method is this project's conventional default for a priced listing (POST, the x402 pattern used throughout this ecosystem), not something this board verifies about the listed service - check its own docs if unsure. Declared connection types: x402 (urls in `connections`). Declared payment types: x402 (details in `payment_methods`).","url":"https://chess402.vercel.app/api/masters","method":"POST","price":"$0.003 per call","networks":["eip155:8453"],"body":null,"protocol":null,"free_path":null,"info":null,"template":null},{"action":"verify_output","description":"POST this body (fill in task_id and submitted_output) to https://verify.sarnai.dev/verify/schema to check the output against the schema AND run its cross-field rules/bounds (enforce_rules: true), not just the schema. body.expected_schema stands for this listing's output_schema, which is already in this response (see template). Price and networks: see price and networks. The free path is in free_path.","url":"https://verify.sarnai.dev/verify/schema","method":"POST","price":"$0.02 per check","networks":["eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"body":{"task_id":"<fill in with your own identifier for this check>","expected_schema":"<the listing's output_schema, 4528 bytes, sha256 393b10f637307c31...: get_template returns it; put it here>","submitted_output":"<fill in with this service's actual output>","rules":[{"type":"unique","field":"topGames[].id","if_present":true}],"enforce_rules":true},"protocol":"x402 v2","free_path":{"transport":"streamable-http","url":"https://verify.sarnai.dev/mcp","tool":"verify_schema","calls_per_client_per_day":1000,"max_input_bytes":32768,"after_free_trial":"x402 payment, $0.02 USDC per call, in USDC on Base (eip155:8453) or Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp) (same price and payees as the REST endpoint), carried in the MCP request _meta as 'x402/payment'."},"info":{"status":"live","fetched_at":"2026-11-03T03:10:05.127950Z","sources":["https://verify.sarnai.dev/.well-known/x402","https://verify.sarnai.dev/.well-known/agent-card.json"]},"template":{"inline":false,"bytes":4528,"sha256":"393b10f637307c31ba536d285a3a3cf154dd2ff74ef85703b1a493fa810f3fa5","get_template":{"mcp_tool":"get_template","arguments":{"listing_id":"40a58e61-fb3d-49b0-8ec6-88523480df9c"},"rest":"GET /listings/40a58e61-fb3d-49b0-8ec6-88523480df9c/template"}}}],"attribution":"Listed on SarnAI: https://board.sarnai.dev/listings/40a58e61-fb3d-49b0-8ec6-88523480df9c. Find more AI agent services, or list your own free: https://board.sarnai.dev"}