{"id":"21d51fcb-bc64-4727-9fb4-9c5763a290ac","shortId":"PMSCez","kind":"x402","title":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","tagline":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (ID 4) via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and settle on the Base network using USDC.\n\nThis specific endpoint (/api/v1/nfts/4/owner) appears to return the current owner of NFT #4. The response MIME type is application/json. No detailed input or output schema documentation was found beyond the x402 challenge metadata, so the exact request body format and response fields are not confirmed.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","pay-per-request NFT data","lowpaymentfee NFT"],"warnings":["No OpenAPI or detailed schema documentation available for this endpoint.","Exact request body format and response fields are unknown — only the x402 challenge metadata was captured.","The endpoint is scoped to a single NFT ID (4); it is unclear whether other NFT IDs are supported at different paths.","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/4/owner","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/nfts/4/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge captured) with clear pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and no examples. The endpoint path suggests NFT ownership data but specifics are inferred from the URL alone.","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":"2026-04-22T00:17:30.627Z","embedding":[-0.018554688,-0.021636963,0.03793335,0.02192688,0.010955811,-0.042175293,-0.015670776,0.020828247,0.022537231,-0.06890869,0.05078125,-0.0038375854,-0.017196655,-0.059051514,-0.03778076,-0.012901306,-0.03503418,-0.026123047,-0.031585693,0.02305603,0.03781128,-0.018066406,-0.00497818,-0.016647339,-0.014465332,0.017501831,-0.0259552,-0.0025901794,-0.01914978,-0.02508545,0.025024414,-0.020339966,-0.005054474,0.011329651,-0.025527954,-0.01210022,-0.019989014,0.004673004,-0.00091934204,-0.041870117,0.016571045,-0.0435791,0.032684326,-0.0027580261,-0.024795532,-0.012580872,0.007457733,-0.026382446,0.00944519,0.0005245209,-0.011352539,0.00705719,0.0013599396,0.010276794,-0.010124207,0.040252686,0.03112793,-0.019165039,-0.0003902912,0.022750854,-0.024749756,-0.08404541,0.027160645,0.015113831,0.026931763,0.03982544,-0.046081543,0.051971436,0.022415161,0.06365967,0.012245178,0.07940674,0.003566742,0.007896423,0.0062789917,-0.020858765,0.0016412735,0.027633667,-0.03793335,-0.03640747,0.0031967163,-0.016189575,-0.041168213,0.00008267164,-0.01423645,-0.049621582,-0.011520386,0.0065689087,-0.050720215,-0.0029067993,-0.07110596,0.008728027,-0.008026123,-0.029708862,0.012664795,-0.05480957,-0.0036525726,-0.0011539459,0.015487671,0.016433716,-0.019439697,-0.0073547363,0.01838684,-0.005706787,0.033599854,0.07067871,0.0004208088,-0.0015716553,-0.020401001,0.014923096,-0.04953003,0.022399902,0.011924744,-0.028457642,-0.014503479,-0.008407593,-0.046447754,0.012962341,-0.027252197,0.028305054,-0.027648926,0.011627197,0.026184082,0.0009212494,0.010894775,-0.030303955,-0.008026123,-0.013000488,0.00072956085,0.00014221668,0.041534424,0.0051651,0.026275635,-0.036102295,-0.06500244,0.014404297,-0.024307251,-0.042633057,-0.031555176,-0.0076179504,0.019302368,-0.021820068,0.004512787,0.016494751,-0.06829834,0.029403687,-0.0065574646,-0.0017280579,-0.004043579,0.033172607,0.02947998,0.0039253235,-0.016677856,0.000102341175,-0.016113281,-0.03668213,0.015945435,0.009651184,-0.030731201,0.023208618,0.0010881424,-0.008522034,0.028182983,-0.0115737915,0.026031494,0.049743652,0.0059890747,-0.052001953,-0.07055664,-0.012580872,-0.0022964478,-0.031082153,-0.015388489,0.004825592,-0.026107788,-0.05456543,0.020187378,-0.020507812,0.011924744,-0.041992188,-0.01084137,-0.06109619,0.011940002,-0.030853271,-0.06317139,-0.0056381226,-0.049224854,0.060516357,0.023864746,0.0284729,0.029754639,0.004371643,0.026947021,0.039215088,-0.022476196,0.0021018982,0.027496338,-0.025680542,0.047180176,-0.003353119,0.024307251,0.009757996,0.010971069,0.06719971,0.017791748,-0.034210205,0.0041503906,-0.079711914,-0.037231445,-0.0022583008,0.004016876,0.00048589706,-0.017166138,0.026275635,-0.061553955,-0.03390503,0.026184082,0.015174866,-0.012886047,0.05114746,0.011680603,0.026504517,0.043426514,0.018493652,-0.04940796,0.016159058,0.034484863,0.00095796585,-0.005718231,-0.046447754,-0.0004544258,0.03213501,-0.014541626,-0.00061798096,-0.028381348,-0.012496948,-0.014572144,0.014022827,0.002412796,0.0124435425,-0.02935791,-0.044555664,0.014762878,0.023010254,-0.014022827,-0.009010315,-0.02909851,-0.06793213,0.03604126,0.027923584,0.032196045,0.01171875,-0.010322571,-0.013839722,-0.0137786865,-0.06842041,0.054748535,0.070007324,0.0055885315,-0.017318726,0.05545044,-0.0078048706,-0.07550049,-0.02078247,-0.020309448,-0.035461426,-0.010978699,-0.003047943,-0.057250977,0.019363403,0.0015630722,0.0024642944,0.0463562,-0.047546387,-0.034820557,0.010063171,-0.028259277,0.016586304,-0.030471802,-0.020050049,0.0048942566,0.026184082,0.040740967,0.015197754,-0.013885498,-0.000497818,0.01838684,-0.010612488,0.0105896,-0.0041999817,-0.010810852,0.005924225,-0.008079529,-0.02027893,-0.008483887,-0.013252258,0.06100464,-0.059509277,0.039245605,0.013824463,0.012565613,0.03439331,-0.014663696,-0.05130005,-0.010673523,0.029556274,0.026824951,0.06036377,0.02949524,-0.014266968,-0.020339966,0.052856445,-0.05621338,-0.018066406,0.0048942566,0.032989502,0.02255249,0.034057617,-0.03479004,-0.034576416,0.0022659302,-0.051513672,0.02229309,-0.024734497,0.011016846,-0.03439331,0.01927185,-0.029327393,-0.026260376,-0.00894928,0.021057129,-0.024612427,0.014823914,-0.018875122,-0.027023315,0.016967773,0.0013399124,-0.018005371,0.028045654,0.028549194,0.03378296,-0.012954712,-0.0335083,-0.054107666,-0.022460938,-0.016418457,-0.011413574,0.017288208,-0.0051994324,0.03665161,-0.021102905,-0.000954628,0.008956909,0.012252808,0.016937256,-0.0003888607,-0.015060425,-0.048706055,-0.062927246,-0.033081055,-0.04623413,0.0041656494,0.05340576,0.014724731,0.029129028,0.01676941,-0.022064209,-0.020950317,0.028701782,-0.06335449,-0.012702942,0.010856628,-0.013412476,-0.02709961,0.00023341179,0.014411926,0.016616821,0.01727295,0.004722595,0.017852783,0.07928467,0.038208008,-0.0044021606,-0.027053833,0.015914917,0.024261475,0.01802063,-0.017166138,-0.045196533,-0.019302368,0.03869629,-0.03543091,-0.019348145,-0.0625,0.0345459,0.022338867,0.08508301,0.020339966,0.012199402,0.04711914,0.0036964417,0.012962341,-0.03866577,-0.014160156,-0.05316162,-0.006427765,0.011238098,-0.019180298,-0.008377075,-0.031799316,0.043426514,-0.004676819,-0.00074100494,-0.020965576,0.062347412,0.0003695488,0.003856659,0.019042969,0.001791954,0.03253174,0.07623291,-0.030319214,0.04220581,-0.008659363,-0.016220093,0.006580353,0.017456055,-0.01197052,-0.0006365776,-0.06298828,0.0003721714,-0.015602112,-0.018371582,-0.042999268,-0.018066406,-0.0053749084,0.043304443,0.038085938,-0.017105103,-0.026000977,-0.005722046,-0.016693115,-0.042816162,-0.0052757263,-0.045074463,-0.0009212494,0.019729614,-0.018569946,0.0101623535,-0.0075683594,0.021072388,0.006664276,0.038970947,0.031951904,-0.0036315918,-0.045776367,0.015113831,-0.01586914,0.03173828,0.0032730103,0.029724121,0.034118652,0.04437256,0.041992188,0.02267456,-0.029525757,-0.077697754,0.02355957,-0.03173828,-0.0069122314,0.034484863,-0.024124146,0.0025863647,-0.009750366,-0.008171082,-0.006187439,0.00079774857,-0.0496521,-0.012634277,0.023651123,-0.04232788,-0.006881714,-0.048736572,-0.021392822,-0.011894226,0.054656982,0.035827637,0.042419434,-0.038085938,-0.012825012,0.016571045,-0.00548172,0.024276733,-0.013404846,-0.024597168,-0.0007071495,-0.0011558533,-0.020690918,-0.0064697266,0.014076233,-0.02394104,-0.007949829,0.010101318,0.04446411,-0.0021839142,0.0055389404,0.010223389,0.013839722,-0.053222656,0.03765869,0.022201538,0.07489014,-0.012496948,-0.015930176,-0.033569336,0.026473999,0.01626587,0.025222778,-0.06185913,-0.009925842,-0.01474762,0.024383545,-0.0011940002,-0.04446411,0.031280518,0.005634308,-0.04953003,-0.046875,0.03768921,0.017364502,0.04046631,0.013328552,0.006072998,0.030426025,-0.009056091,-0.011703491,0.03378296,-0.032409668,-0.010421753,-0.0012578964,-0.03253174,-0.014312744,-0.021133423,-0.018249512,0.02720642,-0.0060768127,0.0037994385,0.012565613,-0.02406311,0.010528564,0.012756348,-0.009246826,0.014411926,0.010047913,0.008621216,0.058410645,0.029769897,-0.03894043,0.036499023,0.024993896,0.0040740967,0.004371643,0.057006836,0.0357666,0.009933472,-0.00067567825,-0.011123657,0.010803223,-0.00793457,-0.008712769,0.019210815,0.009025574,0.02583313,-0.03010559,0.015327454,0.010131836,-0.01751709,-0.009353638,0.024642944,0.01171875,-0.02748108,-0.0056915283,0.015808105,0.057495117,-0.022262573,0.00019299984,-0.026229858,0.03756714,0.03062439,-0.007637024,0.00705719,0.0033817291,-0.007537842,0.026397705,0.024291992,-0.02545166,-0.000395298,0.017044067,0.014602661,0.02130127,0.008773804,-0.016723633,-0.017700195,0.012367249,-0.010276794,-0.015426636,0.03967285,0.006023407,0.035186768,0.010414124,-0.0032253265,0.008666992,-0.026107788,-0.015113831,0.02305603,0.02784729,-0.011528015,-0.013305664,0.01259613,0.010093689,0.02508545,-0.044830322,0.0152282715,0.009635925,0.0009937286,-0.018753052,-0.060302734,-0.006286621,-0.04095459,0.020065308,-0.0041885376,0.00023686886,0.011184692,-0.0062942505,-0.0152282715,-0.007965088,0.01852417,0.012718201,-0.004047394,-0.037322998,-0.0005502701,-0.02029419,0.00085258484,0.0042495728,-0.012046814,-0.05053711,-0.040893555,-0.026626587,-0.032592773,-0.01638794,-0.0181427,-0.022018433,0.01499176,-0.014572144,0.021270752,-0.024124146,-0.041656494,-0.0038471222,-0.014572144,0.02180481,-0.04840088,0.021438599,-0.009399414,0.007144928,-0.009666443,0.0026474,0.015365601,0.026321411,-0.001832962,0.04156494,-0.039489746,0.023666382,-0.00447464,0.015296936,-0.009994507,-0.043762207,-0.0031776428,-0.014839172,-0.013252258,0.033111572,0.0062217712,-0.020706177,-0.010276794,-0.02116394,0.0019836426,-0.0413208,0.02722168,-0.0075683594,0.016983032,-0.032440186,-0.006549835,-0.00806427,0.011444092,-0.024490356,0.007598877,-0.017074585,0.032348633,0.0109939575,0.026901245,-0.024337769,-0.021377563,0.014175415,0.0084991455,-0.048614502,-0.023239136,-0.020019531,-0.025253296,0.008026123,0.011909485,-0.034454346,-0.018798828,0.0014867783,-0.02130127,0.027282715,-0.01802063,0.01550293,0.0049819946,-0.0052757263,0.008155823,0.010375977,0.011489868,0.007911682,0.047973633,-0.0044822693,-0.030181885,0.0010786057,0.024887085,0.022842407,-0.0017528534,-0.008460999,-0.028701782,-0.026901245,-0.03741455,-0.015075684,-0.012069702,0.03086853,-0.002696991,0.005378723,-0.046203613,0.0041770935,-0.031143188,-0.0018110275,0.022705078,-0.010437012,0.019088745,-0.012283325,0.026397705,-0.026657104,-0.004016876,-0.02178955,0.0038089752,0.009002686,-0.0110321045,0.0074501038,0.020065308,-0.007499695,-0.024673462,-0.015541077,-0.0018644333,0.012802124,-0.0047683716,-0.006790161,0.010986328,-0.0132369995,0.015731812,0.008590698,-0.020233154,0.003255844,0.05255127,-0.013450623,-0.021240234,-0.004398346,-0.012260437,0.02243042,0.027679443,-0.050354004,-0.0074386597,-0.02130127,0.026107788,-0.010932922,0.011161804,0.009170532,0.03765869,-0.026672363,-0.05102539,-0.002817154,0.006412506,-0.018875122,-0.0574646,-0.018692017,-0.078430176,0.01335144,-0.017837524,-0.038208008,0.0096588135,0.023162842,-0.021026611,-0.07751465,-0.010314941,0.0473938,0.018692017,0.020263672,0.022018433,0.033447266,0.021957397,-0.021987915,0.009277344,0.00060510635,-0.053253174,-0.0013933182,-0.027328491,0.047180176,0.02319336,-0.016723633,0.019638062,-0.0060272217,0.033111572,-0.019760132,0.02229309,-0.037109375,0.004322052,-0.010650635,0.0118255615,-0.024871826,-0.0058403015,0.041290283,-0.043426514,0.02406311,0.017105103,0.027526855,0.022369385,0.014434814,0.021331787,-0.039215088,-0.0034999847,0.01084137,0.0017061234,0.04815674,-0.03366089,-0.0037899017,-0.0034637451,0.0022525787,-0.02027893,-0.04824829,-0.029373169,-0.018127441,-0.008903503,0.018325806,0.013076782,-0.009506226,-0.0126953125,0.0062561035,0.005569458,0.002450943,0.0049819946,-0.03012085,-0.031219482,-0.049560547,0.008880615,0.024887085,-0.0012569427,-0.019317627,0.031799316,0.034301758,0.021011353,0.016998291,-0.03050232,-0.013374329,0.027252197,-0.00013911724,-0.0043678284,0.021514893,-0.008590698,0.021438599,0.009254456,0.010421753,-0.031585693,-0.041229248,-0.01626587,0.0066833496,0.01727295,-0.01399231,0.0071640015,0.025802612,0.01902771,-0.0015640259,-0.028427124,0.011070251,-0.029922485,-0.02583313,-0.015975952,-0.017990112,0.036132812,0.010025024,-0.024368286,0.01751709,-0.00061416626,0.04095459,-0.0034294128,0.0011148453,0.0317688,0.02305603,0.01878357,-0.02508545,0.013626099,-0.0146484375,-0.027679443,-0.004573822,-0.016342163,0.0066947937,0.026779175,-0.019683838,0.0046195984,0.019424438,0.0357666,0.012718201,0.00058317184,0.01737976,0.032836914,-0.01247406,0.02217102,-0.02230835,0.0345459,0.010787964,-0.0024738312,-0.012336731,-0.0010099411,-0.016143799,0.036865234,0.00762558,-0.008201599,0.032287598,-0.005844116,0.03353882,-0.028579712,-0.031051636,-0.012802124,-0.008758545,0.00000590086,0.020477295,0.023651123,0.00055217743,0.04623413,-0.029327393,0.0075263977,-0.008148193,0.015731812,0.0036945343,-0.019165039,-0.0129776,-0.017150879,0.002620697,-0.011627197,-0.033599854,-0.00019192696,-0.011947632,0.06951904,0.01864624,0.002243042,0.017868042,0.010856628,0.016799927,-0.035888672,-0.02331543,0.00907135,-0.02017212,0.010955811,-0.050109863,0.038238525,0.062927246,0.0079193115,0.052001953,-0.004432678,0.044525146,0.01537323,-0.007820129,-0.01889038,0.010040283,-0.010772705,0.015350342,-0.020843506,0.035095215,-0.028747559,-0.000058054924,-0.0115356445,0.03967285,-0.00945282,0.019989014,0.054351807,0.038482666,-0.018493652,0.045898438,-0.0013866425,-0.045196533,-0.016937256,-0.021514893,0.037506104,0.028945923,0.015350342,0.049102783,0.01550293,0.0037822723,0.002193451,-0.01210022,-0.03463745,0.021240234,0.046051025,-0.025726318,-0.022506714,-0.010009766,-0.014335632,-0.044006348,-0.013023376,0.007724762,-0.010932922,0.026824951,-0.003993988,-0.004535675,-0.018600464,0.017166138,0.031982422,-0.006340027,-0.011672974,0.02720642,-0.0038089752,-0.005393982,0.016616821,0.0027389526,0.006839752,-0.025405884,-0.020874023,0.022125244,0.023208618,-0.01158905,-0.033996582,0.0008955002,0.00054979324,0.03125,0.014297485,-0.024978638,0.008010864,0.0059814453,0.006587982,0.017684937,0.029220581,0.0036945343,0.027954102,0.0357666,0.027297974,0.016494751,-0.03086853,0.0053138733,0.0027389526,0.016098022,0.0055160522,0.00088739395,0.0077705383,-0.019851685,0.04333496,0.016784668,-0.008918762,0.020401001,0.02267456,0.003818512,0.0022506714,0.024810791,0.016784668,-0.01890564,0.004676819,0.009178162,-0.012641907,0.013900757,0.018234253,0.037872314,-0.013412476,0.047424316,0.025878906,-0.038208008,-0.02557373,0.014427185,-0.021118164,0.0031108856,-0.011779785,0.0015563965,-0.046051025,0.042541504,0.0015916824,0.02116394,0.021331787,-0.010238647,-0.022491455,0.009941101,0.02784729,0.027328491,-0.009895325,-0.000002026558,-0.036956787,0.0151901245,0.027053833,-0.005908966,0.005355835,-0.014175415,-0.019714355,0.0043258667,0.014503479,-0.0064086914,-0.0062294006,-0.019927979,-0.04812622,0.025115967,0.018463135,0.005596161,0.049041748,-0.0053253174,-0.024414062,0.0057373047,0.019302368,0.009307861,-0.013130188,-0.006477356,0.026855469,-0.02079773,0.027954102,0.0368042,0.0021572113,0.024887085,0.020431519,-0.014976501,-0.024291992,-0.008728027,0.030578613,-0.027328491,-0.019439697,0.00082588196,0.008758545,-0.014663696,-0.029083252,-0.0049705505,0.00274086,-0.014198303,-0.021621704,0.021652222,0.01411438,0.0016078949,0.014152527,0.019577026,-0.011238098,0.06323242,0.002336502,0.030197144,-0.018051147,0.0066452026,0.02760315,0.0181427,0.055541992,0.009933472,0.018615723,-0.02571106,0.008216858,0.018753052,0.007965088,0.0335083,0.026306152,-0.03829956,0.038726807,-0.016067505,0.052459717,0.007545471,-0.013214111,0.019989014,-0.008842468,-0.007820129,-0.00015187263,-0.005756378,0.022766113,0.04107666,-0.015327454,0.0008916855,-0.008224487,-0.017959595,0.013542175,-0.006668091,0.010566711,0.0009918213,0.0028953552,0.014190674,-0.009292603,-0.0011386871,-0.0029411316,0.03112793,-0.04525757,-0.00982666,0.018417358,0.031173706,-0.019973755,0.029708862,0.0491333,0.010597229,0.0015535355,0.030822754,-0.016311646,0.03955078,-0.0050468445,0.022338867,0.03463745,0.00071287155,0.00333786,0.033233643,0.008636475,-0.028045654,0.006980896,0.03302002,-0.006336212,-0.0023498535,0.01739502,0.028152466,-0.0051612854,-0.001209259,-0.014862061,-0.0013408661,-0.0069618225,-0.009284973,0.0014324188,0.024383545,0.011672974,0.0072364807,0.00020885468,0.0022792816,0.020645142,0.028930664,0.033294678,-0.021514893,-0.004878998,0.008277893,0.02267456,-0.0059051514,-0.007820129,-0.005584717,-0.02116394,-0.023040771,0.020309448,-0.003479004,0.0116119385,-0.042053223,-0.02772522,0.0552063,0.012718201,0.022094727,0.027053833,-0.024337769,0.03463745,-0.000068724155,-0.010032654,0.001964569,-0.0116119385,0.027999878,0.021484375,-0.018005371,-0.029205322,0.009223938,-0.012268066,0.002527237,0.029052734,0.00021255016,0.02041626,-0.018966675,0.022155762,-0.0005784035,0.0036411285,-0.019927979,-0.024383545,0.0073013306,0.02357483,0.037963867,-0.010917664,-0.0039787292,0.024978638,0.026824951,0.003921509,0.053497314,0.0066375732,0.03640747,0.020263672,-0.02230835,-0.017990112,0.020614624,0.0017108917,-0.033447266,-0.0030670166,-0.05307007,-0.04196167,0.02722168,0.0075302124,0.00036382675,-0.043151855,0.0012569427,-0.016235352,-0.008255005,0.009971619,0.0090408325,-0.00019145012,-0.00045967102,0.0051498413,0.020584106,-0.032226562,-0.03338623,-0.010154724,0.0018358231,-0.035461426,-0.045013428,0.013130188,0.007507324,-0.001288414,-0.031829834,-0.002811432,-0.0012454987,0.031341553,-0.008621216,-0.017730713,0.0018606186,0.0335083,0.024169922,0.00522995,0.019165039,-0.019012451,-0.03050232,-0.028152466,0.03112793,-0.013801575,0.040222168,-0.008255005,0.013580322,0.028259277,0.0093688965,0.0035152435,0.0042419434,-0.0024433136,-0.0022468567,-0.031463623,-0.025360107,0.026473999,0.026550293,0.005531311,-0.012863159,0.030593872,-0.022918701,-0.015655518,0.034606934,0.026504517,0.0018606186,-0.00409317,0.009979248,-0.0077323914,-0.010826111,0.0043258667,-0.017791748,0.0041770935,-0.015625,0.020843506,-0.0065460205,0.028656006,-0.0005803108,-0.008483887,-0.013687134,0.026947021,0.025543213,0.017318726,0.02406311,0.023040771,-0.027175903,-0.0146865845,-0.021713257,0.010925293,0.030731201,0.014877319,0.016693115,-0.017654419,-0.01020813,-0.016082764,0.044128418,0.023132324,-0.0034542084,-0.019973755,-0.010620117,-0.044647217,0.03488159,-0.012428284,0.027450562,0.0036506653,0.024749756,0.00039601326,-0.053009033,-0.022964478,0.05883789,-0.013626099,0.0031604767,-0.024353027,0.017852783,0.011398315,-0.042755127,0.00022339821,-0.036346436,-0.022644043,0.0015029907,-0.0044822693,0.011169434,0.0059280396,-0.0049858093,-0.013717651,-0.008865356,0.017852783,0.026550293,0.0038433075,-0.021347046,-0.012199402,0.015113831,0.009788513,-0.009147644,-0.007724762,-0.0019207001,0.0004851818,0.008132935,-0.02709961,0.019226074,-0.037139893,0.016494751,0.003396988,-0.012641907,0.0093307495,0.004589081,0.01626587,-0.025375366,0.00062036514,-0.0027980804,0.012542725,0.061401367,-0.029922485,-0.040252686,-0.0046195984,-0.005455017,-0.027526855,-0.02217102,-0.004825592,0.01737976,-0.05899048,0.019577026,-0.025543213,-0.009300232,0.013214111,0.008163452,-0.01979065,-0.01222229,0.02470398,0.008560181,0.0073242188,-0.005428314,-0.01676941,-0.035858154,-0.031707764,-0.0026893616,-0.011497498,-0.0048179626,0.016174316,0.011268616,0.03475952,-0.0038032532,0.030853271,0.0072021484,0.016174316,0.03579712,0.01550293,0.037750244,0.021850586,-0.037963867,0.01701355,-0.0014972687,-0.030654907,0.026428223,-0.022338867,-0.023788452,-0.034362793,-0.0015335083,-0.003643036,0.005012512,0.020126343,-0.013015747,-0.0054626465,0.005054474,-0.032836914,-0.01953125,-0.014175415,-0.0022125244,0.049041748,0.006752014,0.0048675537,-0.007850647,-0.007537842,0.039031982,0.06021118,-0.014076233,-0.002216339,-0.014640808,0.028701782,0.00032687187,-0.010665894,-0.00045084953,-0.011741638,-0.0017910004,-0.0058250427,-0.009727478,0.020828247,-0.014884949,-0.00017642975,0.0042037964,-0.020477295,-0.017913818,0.028045654,-0.02029419,-0.0040130615,0.009002686,0.0053367615,0.016479492,0.02822876,-0.008110046,0.0046539307,0.01033783,-0.04849243,0.05026245,0.009925842,-0.010574341,0.014587402,0.0008764267,-0.026947021,-0.022201538,0.0011768341,0.0005135536],"createdAt":"2026-04-21T18:32:31.514Z","updatedAt":"2026-04-22T10:03:09.236Z","lastSeenAt":"2026-04-22T10:03:09.236Z","tsv":"'/api/v1/nfts/4/owner':165 '0.02':11,24,80,151 '000':71 '20':70 '4':40,174 '6':76 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':51 'advertis':66 'ai/ml':121 'analysi':124 'analyt':120 'api':84,117 'appear':166 'application/json':180 'attach':94 'base':9,22,61,72,158 'base-network' 'beyond':190 'bodi':199 'broader':111 'call':46 'caller':92 'challeng':65,193 'classif':126 'confirm':206 'convers':143 'current':170 'data':4,17,119,129 'decim':77 'detail':182 'document':187 'embed':127 'endpoint':28,50,146,164 'equal':79 'estim':137 'exact':197 'exchang':132 'feed':131 'field':203 'finance/web3':128 'format':200 'found':189 'gas':136 'gate':116 'generat':144 'geocod':141 'header':99 'host':109 'id':39 'infer':122 'inform':34 'infrastructur':139 'input':183 'json-response' 'key':85 'limit':87 'lowpaymentfee NFT' 'lowpaymentfee.com':30,108 'maxamountrequir':68 'metadata':194 'micropay':7,20 'mime':177 'network':62,159 'nft':2,15,32,38,173 'nft-ownership-lookup' 'no-api-key' 'output':185 'owner':171 'ownership':3,16,33 'pay':44 'pay-per-cal':43 'pay-per-call' 'pay-per-request NFT data' 'payment':98,104 'per':12,25,45,81,152 'post':52 'price':130,149 'proof':105 'protocol':48 'provid':107 'queri':1,14 'quot':135 'rate':86,133 'request':13,26,53,82,153,198 'requir':91 'respons':176,202 'return':31,168 'schema':186 'sentiment':123 'settl':56,155 'simpli':93 'span':118 'specif':37,163 'subscript':89 'suit':112 'summar':125 'token':134 'type':178 'uniform':148 'unit':73 'usdc':58,75,161 'usdc-settlement' 'use':160 'util':140 'valid':102,142 'via':5,18,41 'x':97 'x-payment':96 'x402':6,19,47,64,103,115,192 'x402 NFT endpoint' 'x402-gated':114 'x402-micropayment'","prices":[{"id":"eaa162bf-aa23-4e17-ade6-61cdf95109a7","listingId":"21d51fcb-bc64-4727-9fb4-9c5763a290ac","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/nfts/4/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.514Z"}],"sources":[{"listingId":"21d51fcb-bc64-4727-9fb4-9c5763a290ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/4/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.514Z","lastSeenAt":"2026-04-22T10:03:09.236Z"}],"details":{"listingId":"21d51fcb-bc64-4727-9fb4-9c5763a290ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/4/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge advertising maxAmountRequired of 20000 base units of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/4/owner"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/nfts/4/owner"},{"claim":"All endpoints on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building on-chain data dashboards that verify NFT holders"],"bestFor":["Agents needing quick NFT ownership lookups with no signup","Developers prototyping x402 payment flows on Base","Applications requiring per-call billing without subscriptions"],"notFor":["Bulk NFT collection scans across thousands of token IDs","Historical ownership or transfer history queries (not indicated by this endpoint)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.233Z"},"updatedAt":"2026-04-22T10:03:09.236Z"}}