{"id":"6c64dd89-5c62-4c8a-93b6-544bfc43a916","shortId":"ZcxgVf","kind":"x402","title":"Query DOT wallet balances via x402 micropayment — $0.02 per request on Base.","tagline":"Query DOT wallet balances via x402 micropayment — $0.02 per request on Base.","description":"This endpoint at lowpaymentfee.com returns Polkadot (DOT) wallet balance data, accessible through the x402 payment protocol. Each call costs $0.02 (20,000 base units of USDC on Base network, where USDC has 6 decimals). No API keys or accounts are required — callers simply attach an x402 payment header with each request.\n\nThe endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints share the same $0.02/request pricing model and settle payments on the Base L2 network using USDC (contract 0x8335…2913). The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json responses.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact request body format and response structure for the DOT balance endpoint must be inferred or discovered experimentally.","tags":[],"capabilities":["dot-wallet-balance","x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key","crypto-balance-query"],"categories":["crypto","finance"],"synonyms":["Polkadot balance API","DOT balance check","crypto wallet balance","Polkadot wallet query","DOT address balance","x402 crypto API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — request/response format is unknown and must be discovered experimentally","All doc pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","Example request JSON is inferred (not sourced) based on the endpoint path pattern","The broader lowpaymentfee.com platform lists many endpoints but provides no verifiable documentation for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/DOT/balance","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/DOT/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, and all documentation pages are empty beyond a wallet-connect prompt. The request and response examples are inferred, not sourced.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T14:30:16.197Z","embedding":[0.0044021606,-0.04348755,0.0004274845,0.020690918,0.015716553,-0.014060974,-0.02279663,0.0368042,0.05328369,-0.04788208,0.020050049,-0.020690918,-0.00844574,-0.026275635,0.0037555695,-0.011276245,-0.016601562,-0.0061950684,-0.020599365,0.03451538,0.013435364,-0.016937256,-0.02659607,0.017532349,0.012939453,-0.00044631958,0.029922485,-0.016494751,-0.0209198,-0.066833496,0.028717041,-0.034576416,0.018814087,0.013313293,0.031433105,0.023757935,0.022247314,0.031707764,0.017318726,-0.01979065,-0.026824951,-0.07385254,0.013664246,0.0036296844,-0.027328491,0.0018072128,0.020309448,-0.043518066,0.03881836,-0.026123047,-0.06112671,0.013839722,0.021270752,0.015701294,0.0054130554,0.025100708,-0.0014133453,-0.02507019,0.03857422,0.012390137,0.010368347,-0.06262207,-0.009735107,0.0039482117,0.02331543,0.054260254,-0.0040740967,0.027679443,-0.007858276,0.036987305,0.051361084,0.06359863,0.02520752,-0.020202637,-0.010925293,-0.029327393,-0.0060310364,0.001953125,-0.026367188,-0.013656616,-0.0022144318,-0.023406982,-0.060424805,-0.030838013,-0.013542175,-0.05697632,-0.0079193115,-0.007232666,0.006088257,0.015686035,-0.083496094,-0.011154175,0.011131287,-0.009094238,0.015777588,-0.03277588,0.0038070679,0.0104522705,-0.013061523,-0.0034484863,-0.0008211136,-0.028564453,0.014266968,0.0104599,0.033721924,0.040618896,0.006340027,0.009498596,0.035705566,0.0030593872,-0.036499023,-0.0033912659,-0.017684937,-0.0085372925,0.014038086,0.03793335,-0.02848816,0.03366089,-0.006275177,0.020248413,-0.051818848,0.056488037,0.03704834,0.0046806335,0.00573349,-0.03427124,-0.04724121,-0.009902954,-0.020812988,0.035888672,0.050872803,0.009063721,0.025466919,0.0056533813,-0.046966553,0.017028809,-0.020263672,-0.00843811,-0.029647827,-0.036315918,0.04257202,-0.030517578,0.020309448,0.011741638,-0.06744385,0.009101868,-0.021072388,0.0066375732,-0.0082092285,0.008880615,-0.0020942688,0.018341064,0.013442993,-0.023605347,-0.021377563,-0.033843994,-0.0056114197,0.013839722,-0.0036144257,0.053985596,-0.045135498,0.034942627,0.008911133,-0.039611816,0.018875122,0.024383545,-0.02583313,-0.057281494,-0.08325195,-0.041381836,0.015106201,-0.019500732,0.0066490173,-0.0071983337,-0.017440796,-0.055755615,-0.015655518,-0.018341064,-0.0059013367,-0.036468506,0.004611969,-0.023391724,0.04168701,-0.009246826,-0.037353516,-0.030899048,-0.028320312,0.05368042,0.015655518,0.0362854,-0.0017776489,0.03390503,0.05215454,0.016998291,-0.022476196,-0.04800415,0.015266418,-0.044830322,0.006668091,0.003730774,0.008399963,-0.022247314,0.033477783,0.039215088,-0.028564453,-0.008880615,0.016906738,-0.07080078,-0.015823364,-0.009613037,0.009963989,0.028030396,-0.016906738,0.009689331,-0.03552246,-0.0063095093,-0.0023002625,-0.010444641,0.0011148453,0.03604126,0.010444641,0.018463135,0.04324341,0.01637268,-0.044189453,0.03793335,0.060028076,0.036895752,0.008346558,-0.008743286,0.019744873,0.03265381,-0.027130127,0.016799927,0.0012016296,-0.009132385,-0.028396606,-0.032196045,0.00945282,-0.018203735,-0.011657715,-0.03149414,0.0018053055,0.02848816,-0.002588272,-0.02961731,-0.047607422,-0.07141113,0.030395508,0.000016152859,0.010414124,0.009803772,-0.0048561096,-0.022537231,-0.016525269,-0.042785645,0.051208496,0.057617188,-0.012145996,-0.008369446,0.03225708,-0.012863159,-0.026443481,0.015205383,-0.02935791,-0.010528564,-0.029647827,0.0049209595,-0.07080078,0.027755737,0.020828247,0.019866943,0.030319214,0.0016698837,-0.04171753,-0.03842163,-0.030090332,-0.0037059784,-0.014587402,0.02659607,0.0014123917,0.02305603,0.016174316,-0.009086609,0.019470215,-0.0126953125,-0.0050621033,-0.0037059784,0.021484375,-0.009017944,0.007598877,0.06536865,0.023757935,-0.03048706,0.004470825,-0.033447266,0.03439331,-0.064086914,0.055267334,-0.02204895,0.0053710938,0.057525635,-0.0000073313713,-0.043762207,0.016586304,-0.0141067505,0.07281494,0.038085938,-0.0020866394,-0.017303467,0.0034694672,0.07208252,-0.033599854,0.023727417,0.0012054443,0.03918457,0.030700684,0.026397705,-0.040893555,-0.04776001,0.00957489,-0.021759033,0.043182373,-0.05319214,0.046569824,-0.009109497,0.029052734,-0.024673462,-0.0049209595,-0.030838013,-0.0020370483,0.015487671,0.029006958,-0.010322571,-0.003993988,0.009681702,0.032928467,-0.02003479,0.007820129,0.091308594,0.0069618225,-0.0044937134,-0.010505676,-0.048431396,-0.027908325,-0.010856628,0.010528564,-0.010597229,0.009613037,0.013938904,-0.025482178,-0.0067481995,0.015304565,0.004886627,0.039001465,0.002336502,-0.012077332,-0.064819336,-0.040649414,-0.031311035,-0.048553467,0.022735596,0.0033245087,0.0075912476,0.06994629,0.009017944,-0.009429932,-0.01713562,0.0093307495,-0.05328369,0.020858765,0.03717041,-0.010314941,-0.008018494,0.010978699,-0.004623413,0.026763916,0.055023193,0.0021305084,0.026229858,0.064697266,0.027313232,-0.0029010773,0.0012292862,0.02508545,0.019332886,0.0012331009,0.0017623901,-0.03616333,-0.0063476562,0.034362793,-0.027648926,-0.007713318,-0.050323486,0.023956299,0.028518677,0.05206299,0.012710571,0.023620605,0.012672424,-0.0044517517,0.016357422,-0.04827881,-0.027435303,-0.030075073,-0.032470703,0.0284729,-0.013793945,0.021148682,-0.031707764,0.022583008,-0.023544312,0.002450943,-0.02607727,0.01928711,-0.014137268,-0.0034236908,0.045684814,0.024642944,0.043273926,0.03756714,0.017852783,0.028961182,-0.02961731,-0.046813965,0.016418457,0.011856079,0.0063552856,-0.011711121,-0.09265137,-0.003921509,0.012168884,0.008331299,-0.036743164,0.0035991669,-0.026473999,0.03717041,0.01184082,-0.008491516,-0.06567383,-0.0026607513,-0.03778076,-0.07287598,0.021636963,-0.04107666,0.013298035,0.04928589,-0.028518677,0.030212402,-0.01713562,0.00061655045,-0.014183044,0.010856628,0.0552063,0.009849548,-0.030441284,0.024963379,0.0007658005,0.00982666,0.040740967,0.03955078,0.0574646,0.018615723,0.035003662,0.024017334,-0.004131317,-0.06185913,-0.005569458,-0.05899048,0.033599854,0.024108887,-0.039367676,0.013023376,-0.011528015,-0.018692017,-0.04336548,0.03640747,-0.046813965,-0.0037651062,0.023330688,-0.027435303,-0.06591797,-0.046569824,-0.031951904,0.023666382,0.06933594,0.00027108192,0.020050049,-0.05682373,-0.03161621,0.015487671,-0.012954712,0.034484863,-0.012756348,-0.033325195,-0.015563965,-0.020721436,0.016998291,-0.016174316,0.009254456,0.013496399,-0.049102783,0.020767212,0.017303467,0.041015625,0.02519226,0.008728027,0.02293396,-0.035949707,0.02078247,-0.0067977905,0.03036499,0.016555786,-0.021362305,-0.06939697,0.016464233,0.03186035,0.028030396,-0.025360107,0.0014724731,-0.019226074,0.018676758,0.012039185,-0.0069007874,0.019958496,-0.0030822754,-0.055114746,-0.093566895,0.034851074,-0.005844116,0.026245117,-0.013198853,-0.01449585,0.03353882,-0.00054883957,0.008003235,0.015007019,0.0043678284,-0.0063056946,-0.010261536,-0.0026245117,-0.009544373,-0.016555786,-0.024139404,0.03967285,-0.012428284,0.02003479,0.006225586,-0.0028572083,-0.0019950867,0.022720337,0.010253906,-0.0087890625,0.0055389404,0.0040740967,0.030563354,0.0010290146,-0.061279297,0.04119873,0.020965576,-0.014701843,0.00944519,0.018249512,0.017944336,0.003932953,0.01007843,-0.0061302185,-0.020751953,-0.048980713,-0.008720398,0.0034999847,0.013221741,-0.013755798,-0.056396484,0.02078247,0.019958496,-0.054779053,-0.0049858093,0.031204224,0.0018157959,-0.027130127,-0.008087158,0.025146484,0.045532227,-0.028320312,0.0234375,0.00019454956,0.01689148,0.02331543,0.018661499,0.0037403107,0.040740967,-0.002521515,0.02758789,-0.010948181,-0.03604126,0.007259369,-0.018325806,0.025482178,-0.0045814514,-0.020446777,-0.0053749084,-0.014015198,-0.007419586,0.012840271,-0.020095825,0.04269409,0.026229858,0.010475159,0.0069999695,-0.0022678375,0.016357422,-0.004470825,-0.009887695,0.033935547,0.04046631,-0.03781128,-0.009963989,0.014122009,0.004306793,0.023376465,-0.033813477,-0.0037498474,-0.015144348,0.008308411,-0.02041626,-0.053833008,-0.02508545,-0.01651001,0.009475708,-0.0037822723,0.008148193,0.031677246,-0.0029296875,0.023880005,0.02154541,0.019363403,0.0055618286,-0.02355957,-0.047424316,-0.007091522,-0.03378296,0.023483276,-0.028564453,-0.005016327,-0.024719238,-0.020004272,0.014808655,-0.019485474,-0.0037555695,0.00037956238,-0.009925842,0.011756897,0.0025291443,-0.0019683838,0.002670288,-0.02607727,0.016403198,-0.0074539185,0.018585205,-0.03692627,0.015670776,-0.029006958,0.004890442,-0.0060768127,0.0236969,0.013496399,0.032592773,0.01928711,0.03717041,-0.03640747,0.03652954,-0.020584106,0.026763916,-0.031204224,0.0018348694,-0.015068054,0.0033435822,-0.0005226135,0.054473877,-0.009651184,-0.0010519028,-0.018997192,-0.038970947,-0.0057678223,-0.050964355,0.034332275,0.044189453,0.044830322,-0.028518677,-0.0047035217,-0.011886597,0.015777588,0.011146545,-0.027633667,0.0023918152,0.04260254,0.018463135,0.026443481,-0.015266418,-0.01725769,-0.0057640076,-0.009147644,-0.042541504,-0.02784729,-0.027267456,0.033203125,0.009552002,-0.003288269,-0.013679504,-0.017868042,-0.0043525696,-0.024978638,0.004512787,-0.021102905,0.024459839,0.00004631281,-0.0039596558,0.006801605,0.0060806274,-0.03552246,0.03314209,0.010185242,0.008239746,-0.0024986267,-0.003660202,0.014297485,0.014961243,0.023895264,-0.046722412,-0.015625,0.0052108765,-0.07104492,-0.009712219,-0.005050659,0.012680054,-0.006111145,0.0178833,-0.048187256,-0.016571045,-0.007709503,0.0023345947,-0.007183075,-0.0058555603,0.016555786,0.009902954,-0.0008611679,0.0007839203,-0.029174805,-0.010925293,0.0024681091,0.00831604,0.022018433,0.01600647,0.032348633,0.005050659,-0.021392822,-0.018554688,0.0029621124,-0.0026397705,-0.022537231,0.016723633,-0.037322998,0.017166138,-0.00021159649,-0.004398346,-0.0209198,-0.00032138824,0.057281494,0.0047836304,0.0050697327,-0.0057144165,-0.011039734,0.026428223,0.04815674,-0.04663086,-0.016082764,-0.030807495,-0.012367249,-0.032318115,0.019607544,-0.009643555,0.029693604,-0.016403198,-0.033111572,-0.01727295,0.0044136047,0.0019035339,-0.051971436,-0.014724731,-0.090148926,-0.010101318,-0.008934021,-0.010223389,0.019836426,0.0014286041,-0.011886597,-0.058898926,0.002565384,0.010284424,0.012504578,0.008369446,0.022842407,0.02935791,0.017974854,-0.039916992,-0.0015687943,0.010353088,-0.044006348,-0.029800415,-0.03253174,0.025558472,-0.024291992,-0.009506226,0.012619019,0.010063171,0.015823364,-0.012321472,0.032440186,0.0002477169,0.028244019,-0.013679504,-0.0007009506,-0.026031494,-0.003063202,0.053497314,-0.048828125,0.037384033,-0.0011110306,0.015159607,-0.006641388,-0.005126953,0.026351929,-0.024383545,0.0066566467,0.010978699,0.024932861,0.042388916,-0.018035889,0.021713257,0.024734497,0.0017518997,-0.022247314,-0.044799805,-0.012710571,-0.046661377,-0.035003662,0.0178833,0.0029850006,0.023147583,-0.017471313,0.002840042,0.008338928,0.011566162,0.007724762,0.0012578964,0.014442444,-0.022918701,0.013938904,-0.0013093948,0.02407837,-0.019317627,0.0093307495,0.05255127,0.016036987,-0.0025558472,0.0008125305,0.012336731,0.015823364,0.014045715,0.001247406,0.015975952,0.011116028,-0.0062408447,-0.004436493,-0.013877869,-0.027008057,-0.037200928,-0.011245728,0.0026836395,0.01550293,-0.0049591064,0.020309448,0.0017557144,0.01625061,-0.01689148,-0.042297363,0.004585266,-0.013175964,-0.024475098,-0.018585205,-0.005832672,0.00868988,0.004234314,0.016296387,0.0071525574,-0.020553589,0.02420044,-0.0069999695,-0.00022506714,0.00868988,0.053833008,0.02279663,-0.004928589,-0.010681152,-0.006969452,-0.013412476,0.004535675,-0.026443481,0.018737793,0.07476807,-0.034606934,0.022613525,-0.0068511963,0.024978638,-0.012023926,0.00068998337,0.0049972534,0.008346558,0.019866943,0.036743164,-0.040252686,0.016052246,0.012802124,-0.006389618,0.003124237,-0.044830322,-0.006385803,0.013183594,0.007724762,0.0038814545,0.041381836,0.015289307,0.022354126,0.0034503937,-0.031311035,0.020996094,-0.04348755,0.009277344,0.021011353,-0.013000488,0.00016307831,0.022232056,0.010986328,-0.012031555,-0.016159058,0.0031204224,-0.00094652176,0.026107788,0.002029419,-0.011619568,-0.0077705383,-0.019485474,-0.028244019,-0.0071907043,0.017303467,0.029800415,0.016830444,0.032348633,0.03173828,0.017120361,0.01864624,-0.031341553,-0.030044556,0.012260437,-0.0014505386,0.012962341,-0.0016775131,0.020767212,0.034332275,0.000248909,0.027450562,0.03527832,0.05407715,-0.0033340454,0.012191772,0.0059928894,0.036254883,-0.006591797,0.016555786,-0.029846191,0.02684021,-0.0073013306,0.011245728,-0.021591187,-0.002937317,-0.003850937,0.050872803,0.0690918,-0.013183594,0.0015144348,0.027755737,-0.0149383545,-0.015464783,0.010498047,0.0035648346,0.042236328,0.029693604,0.032592773,0.022033691,0.025726318,-0.014968872,-0.0088272095,-0.0076026917,-0.029693604,0.058258057,0.033966064,-0.0385437,-0.01725769,-0.027191162,0.020111084,-0.036956787,-0.025421143,0.030197144,-0.009063721,-0.019821167,0.0178833,-0.015144348,-0.0010299683,0.010826111,-0.005832672,0.009811401,-0.032989502,0.023666382,0.023117065,0.0035953522,0.028442383,-0.0068588257,0.014465332,-0.021881104,-0.013763428,0.010635376,0.022399902,-0.0010633469,-0.01461792,0.020568848,0.001584053,0.0289917,0.017410278,-0.008285522,0.0068206787,0.015281677,0.007980347,-0.011238098,0.040496826,0.0020961761,0.01928711,0.031280518,0.029754639,0.019073486,0.006500244,0.022033691,-0.014526367,0.010505676,-0.011383057,0.0060653687,0.0054244995,-0.01626587,0.018585205,0.0055389404,-0.0039024353,-0.0056991577,0.016677856,-0.011054993,-0.017105103,0.010437012,-0.018188477,-0.004550934,0.016937256,0.028396606,0.0043754578,0.0018358231,0.0368042,0.02571106,-0.031433105,0.00793457,-0.022094727,-0.01084137,-0.013496399,0.026000977,-0.04815674,0.006214142,-0.013801575,-0.0021038055,-0.044921875,0.028884888,0.009750366,0.0069770813,0.022216797,0.02848816,0.012641907,0.0014286041,0.02279663,0.025421143,0.014778137,0.013153076,-0.031707764,0.031204224,0.029556274,0.0042419434,-0.0065078735,0.0075187683,-0.00084495544,0.026626587,0.022766113,0.0018730164,-0.0016775131,-0.0014181137,-0.03149414,0.018722534,0.026824951,0.0027561188,0.066589355,-0.026947021,-0.0035495758,-0.010261536,0.025344849,-0.0018730164,0.004322052,0.0025234222,0.024124146,-0.015266418,0.028640747,0.04360962,-0.015655518,0.033996582,0.024719238,-0.0184021,-0.011428833,-0.005203247,0.020614624,-0.029312134,-0.0014295578,-0.00020968914,0.03012085,-0.015380859,-0.032104492,0.008056641,-0.0121154785,-0.019500732,-0.0132369995,-0.012672424,0.0090408325,0.04711914,0.0010728836,0.0046539307,-0.01727295,0.05734253,0.0056266785,0.04675293,0.01158905,0.02293396,0.053985596,-0.015342712,0.03579712,-0.0066108704,0.018539429,-0.007858276,0.010292053,0.027923584,0.025314331,0.014678955,0.025238037,-0.003080368,0.05886841,-0.020507812,0.05529785,0.0043296814,-0.017608643,0.012306213,-0.0015554428,-0.0335083,-0.004108429,0.0025863647,-0.0050735474,0.020690918,-0.026550293,-0.002527237,-0.010009766,-0.015914917,0.011489868,-0.006095886,0.0049362183,-0.017593384,-0.012138367,0.013435364,-0.019683838,-0.0284729,0.0137786865,0.004623413,-0.044189453,-0.004016876,0.018737793,0.02128601,-0.02180481,0.041290283,0.04244995,0.0368042,-0.016677856,0.060028076,-0.018310547,0.02255249,0.013122559,0.044647217,0.026565552,0.019592285,-0.0072631836,0.017593384,0.008743286,-0.017120361,-0.006095886,0.031433105,0.009933472,0.006511688,0.018295288,-0.0413208,0.01966858,0.0045547485,-0.017822266,-0.0149002075,-0.035064697,-0.01940918,-0.0143585205,0.0093688965,-0.027038574,0.013381958,0.008590698,-0.0024032593,0.025985718,-0.0013570786,0.031982422,-0.02923584,-0.010047913,0.0143966675,0.017089844,-0.011558533,-0.01474762,0.009399414,-0.045135498,-0.011627197,0.0149383545,-0.015083313,0.01991272,-0.004047394,-0.00881958,0.039093018,0.014541626,0.00030350685,0.011360168,-0.018173218,0.007282257,0.009254456,0.03488159,0.0095825195,-0.013397217,-0.0039138794,0.037139893,0.0010223389,-0.030014038,0.01777649,0.016357422,-0.0039634705,-0.00063467026,0.0051002502,0.024002075,-0.009651184,-0.010353088,-0.0061454773,0.026306152,-0.0062942505,-0.014266968,0.0035800934,0.024749756,0.04611206,0.008575439,-0.018188477,-0.014541626,0.032562256,0.0052375793,0.02128601,-0.00047278404,0.041412354,0.02659607,0.0024585724,-0.013702393,0.040130615,-0.018325806,0.002380371,0.042297363,-0.035003662,0.009902954,0.011192322,0.018859863,0.010101318,-0.021530151,-0.0029850006,-0.006942749,-0.030075073,0.026885986,-0.008995056,0.010192871,-0.011558533,-0.035614014,0.007007599,-0.031097412,-0.03692627,-0.01222229,-0.0054740906,-0.017059326,-0.07623291,0.023284912,-0.0021572113,0.0042877197,-0.032440186,-0.007171631,-0.017807007,0.020370483,-0.010131836,-0.0014896393,-0.009803772,0.005832672,0.033416748,0.011657715,0.007972717,-0.017196655,-0.028533936,-0.025146484,-0.026504517,0.0058937073,0.034423828,0.010597229,0.02961731,0.0082092285,-0.009902954,0.0021781921,0.013679504,0.0022773743,-0.0018196106,-0.02859497,-0.0055160522,0.02885437,0.027267456,-0.011558533,-0.028808594,0.03717041,-0.009803772,-0.014015198,0.03717041,0.02519226,0.012641907,0.013618469,-0.027755737,0.023452759,-0.01586914,-0.015319824,-0.0035037994,-0.00573349,-0.010925293,0.003025055,0.0184021,0.028717041,0.024169922,-0.018859863,-0.016525269,0.029724121,0.04196167,-0.015167236,0.003353119,0.008384705,0.0026340485,-0.016845703,-0.006084442,0.004699707,0.036346436,0.03387451,0.023956299,-0.017562866,0.011688232,-0.004486084,0.010932922,0.024337769,-0.016418457,-0.027633667,-0.019454956,0.006465912,0.032806396,-0.01676941,0.0022010803,-0.022262573,0.005302429,-0.021728516,-0.035247803,-0.03225708,0.014305115,0.035461426,0.00554657,-0.017059326,-0.016311646,-0.007865906,-0.03753662,-0.0011663437,-0.040649414,-0.007980347,0.0012512207,0.031311035,0.018844604,0.011367798,-0.014427185,-0.013153076,0.024658203,0.005027771,0.021118164,0.024353027,-0.01576233,0.0003695488,0.014846802,0.022140503,-0.0057525635,-0.00025510788,0.0039863586,-0.0062789917,0.030441284,-0.0093307495,0.028244019,-0.026992798,-0.0016441345,-0.00046491623,0.020446777,0.025634766,-0.028884888,0.019699097,-0.052612305,-0.0012989044,0.017684937,0.0049819946,0.016860962,-0.017578125,-0.02142334,0.00806427,0.0027370453,-0.008850098,0.007633209,0.016021729,0.043151855,-0.0021400452,0.011886597,-0.03555298,-0.031433105,0.008033752,0.0012598038,-0.020950317,-0.009010315,0.014541626,0.016479492,0.010635376,0.009483337,0.010414124,-0.024642944,-0.011306763,-0.003255844,0.006126404,0.00907135,0.0026474,0.01928711,0.03793335,0.026687622,0.02041626,0.0037117004,0.01878357,0.021392822,0.01751709,0.061920166,0.014221191,-0.029205322,0.010421753,0.009590149,-0.0060806274,-0.0004312992,-0.012802124,-0.002166748,-0.013435364,0.0075302124,0.002023697,0.019866943,0.016296387,0.029006958,-0.017227173,-0.011375427,-0.028320312,-0.0070495605,-0.013435364,0.008094788,-0.00088882446,0.028533936,0.024459839,-0.00089740753,-0.005874634,0.016113281,0.032440186,-0.0027370453,-0.041290283,-0.027526855,0.0023536682,0.0077934265,0.0065612793,-0.0045318604,-0.03375244,-0.0093307495,-0.0099487305,-0.014022827,0.02861023,-0.022979736,0.021713257,0.0067596436,-0.045715332,-0.023132324,0.024871826,0.00025868416,-0.016281128,0.020950317,0.0075912476,0.04638672,0.022094727,-0.0020771027,0.015548706,0.026443481,-0.041015625,0.056396484,-0.0065689087,0.024734497,-0.015853882,0.0036201477,-0.016036987,-0.030654907,0.010154724,-0.0025539398],"createdAt":"2026-04-18T19:28:09.312Z","updatedAt":"2026-04-23T14:01:59.253Z","lastSeenAt":"2026-04-23T14:01:59.253Z","tsv":"'/api':150 '/docs':149 '/pricing':151 '/readme':153 '/request':109 '0.02':8,20,44,108 '000':46 '0x8335':123 '20':45 '2913':124 '6':57 'DOT address balance' 'DOT balance check' 'Polkadot balance API' 'Polkadot wallet query' 'accept':133 'access':35 'account':63 'addit':164 'ai/ml':96 'analyt':95 'api':60,89 'application/json':138 'attach':68 'avail':180 'balanc':4,16,33,192 'base':12,24,47,52,117 'base-network' 'beyond':141 'bodi':184 'broader':82 'call':42,88 'caller':66 'challeng':127 'confirm':128 'connect':159 'contract':122 'cost':43 'crypto wallet balance' 'crypto-balance-query' 'data':34,94,99 'decim':58 'detail':166 'discov':198 'document':140,175 'dot':2,14,31,191 'dot-wallet-balance' 'endpoint':26,77,104,130,193 'exact':182 'exampl':178 'experiment':199 'extrem':146 'finance/web3':98 'format':185 'header':72 'infer':97,196 'infrastructur':101 'key':61 'l2':118 'land':143 'live':132 'lowpaymentfee.com':28,92 'micropay':7,19 'micropayment API' 'model':111 'must':194 'network':53,119 'no-api-key' 'offer':90 'openapi':170 'page':144,154 'part':79 'pay':86 'pay-per-cal':85 'payload':179 'payment':39,71,114 'per':9,21,87 'per-request-pricing' 'polkadot':30 'post':134 'price':110 'prompt':161 'protocol':40 'queri':1,13 'render':156 'request':10,22,75,135,183 'request/response':173 'requir':65 'respons':139,187 'return':29,137 'schema':174 'settl':113 'share':105 'simpli':67 'span':93 'spars':147 'spec':171 'structur':188 'suit':83 'technic':165 'unit':48 'usdc':50,55,121 'usdc-settlement' 'use':120 'util':102 'via':5,17 'wallet':3,15,32,160 'x402':6,18,38,70,126 'x402 crypto API' 'x402-payment'","prices":[{"id":"07681a34-c572-48e9-ad16-c0acc1f931d8","listingId":"6c64dd89-5c62-4c8a-93b6-544bfc43a916","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/DOT/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:09.312Z"}],"sources":[{"listingId":"6c64dd89-5c62-4c8a-93b6-544bfc43a916","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/DOT/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:09.312Z","lastSeenAt":"2026-04-23T14:01:59.253Z"}],"details":{"listingId":"6c64dd89-5c62-4c8a-93b6-544bfc43a916","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/DOT/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"address\": \"1FRMM8PEiWXYax7rpS6X4XZX1aAAxSWx1CrKTyrVYhV24fg\"}'","exampleRequest":{"address":"1FRMM8PEiWXYax7rpS6X4XZX1aAAxSWx1CrKTyrVYhV24fg"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge confirming it is live and accepts POST","source_url":"https://lowpaymentfee.com/api/v1/wallet/DOT/balance"},{"claim":"Price is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/wallet/DOT/balance"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, settling on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Checking the DOT balance of a Polkadot wallet address programmatically","Integrating DOT balance lookups into trading bots or portfolio trackers","Agent-driven portfolio monitoring that pays per query with no subscription"],"bestFor":["Developers needing on-demand DOT balance queries without API key management","AI agents that can settle x402 micropayments on Base","Low-volume or sporadic crypto balance lookups where per-call pricing is preferable to subscriptions"],"notFor":["High-frequency balance polling where $0.02/request adds up quickly","Users who need detailed DOT transaction history or staking info (not documented)","Anyone requiring comprehensive multi-chain wallet analytics in a single call"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.028Z"},"updatedAt":"2026-04-23T14:01:59.253Z"}}