use
http://wiki.warlight.net/index.php/Validate_invite_token_API if you need this for CLOT
if you just want to know you can also use ValidateInviteToken - find players at certain level - let's say yoshi (level28), then check his invite token:
http://warlight.net/API/ValidateInviteToken?Token=501413523 "name": "Yoshi",
"level": "28",
"isMember": "False",
"color": "#943e3e",
"tagline": "",
"createPlayerLimit": "18",
"lowestUsableLuckModifier": "50",
"levelForMapUsage": "200",
"featuresUnlocked": "CanChangeKillRates, CanOverrideBonuses, CanUseAbandonCard, CanUseAirliftCard, CanUseAttackOnlyTransferOnly, CanUseBlockadeCard, CanUseDiplomacyCard, CanUseExtraArmiesForTerritories, CanUseGiftCard, CanUseHighFog, CanUseMultiAttackAndAttackByPercentage, CanUseOpenSeatPrerequisites, CanUseOrderPriorityAndOrderDelayCards, CanUseSanctionsCard, CanUseSpyLikeCards, CanUseWastelands"
then repeat for other levels