{"id":"41ab4100-005f-47a0-b6fa-141653ec5556","shortId":"qKZ2bG","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 the owner of NFT #43 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). Each call costs a maximum of 0.02 USDC (20,000 base units with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced at $0.02 per request on the same x402 model. However, this specific listing covers only the `/api/v1/nfts/43/owner` NFT ownership endpoint.\n\nThe endpoint is live and returns a proper 402 challenge with x402 version 1. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema, so the exact shape of the returned data must be discovered by making a paid call.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","who owns NFT","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","Ancillary pages (/api, /pricing, /README) return only a 'Connect wallet' stub with no content","The endpoint is scoped to a single NFT (ID 43); unclear if other NFT IDs are supported at different paths","No example request or response payloads are provided by the source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/43/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/43/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the ancillary pages (/api, /pricing, /README) are empty. The specific purpose ('Premium API Access' for NFT #43 owner) is narrow and only lightly described.","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":"2026-04-22T00:17:35.212Z","embedding":[-0.027389526,-0.029373169,0.041625977,0.0105896,0.009880066,-0.050109863,-0.012184143,0.025558472,0.033325195,-0.062042236,0.0524292,-0.0033359528,-0.02168274,-0.048461914,-0.036621094,0.0017776489,-0.037231445,-0.018875122,-0.025268555,0.018493652,0.045288086,-0.0073547363,-0.016189575,0.0064315796,-0.020645142,0.0052833557,-0.028747559,-0.008171082,-0.023223877,-0.019943237,0.028793335,-0.022064209,-0.015213013,0.014389038,-0.023666382,-0.015625,-0.012573242,0.0046424866,0.015472412,-0.029785156,0.004600525,-0.048950195,0.0362854,-0.0021839142,-0.03765869,-0.0013046265,0.005256653,-0.024978638,0.0073280334,-0.003276825,-0.031677246,-0.004348755,-0.012374878,0.012573242,-0.0054969788,0.044311523,0.0034160614,-0.010772705,-0.013908386,0.023422241,-0.008049011,-0.07928467,0.027770996,0.009780884,0.03024292,0.04119873,-0.030212402,0.064941406,-0.000011146069,0.07086182,0.023483276,0.056762695,-0.010948181,0.0057640076,0.009788513,-0.019882202,-0.004802704,0.049591064,-0.03805542,-0.055786133,-0.004432678,-0.021453857,-0.041809082,-0.00073099136,-0.020462036,-0.046203613,-0.016601562,0.0028095245,-0.043823242,0.011703491,-0.07208252,0.0038928986,-0.00051116943,-0.018661499,0.019989014,-0.045013428,0.00541687,0.00497818,0.011734009,0.008491516,-0.007881165,-0.010345459,0.02859497,0.002040863,0.02696228,0.06921387,0.009147644,0.010192871,-0.0055732727,0.012313843,-0.05029297,0.028900146,0.0007452965,-0.035705566,-0.0066375732,0.013961792,-0.027557373,0.011047363,-0.02645874,0.024749756,-0.028640747,0.008895874,0.035125732,0.01953125,0.001124382,-0.03930664,-0.013473511,0.00033187866,-0.009277344,-0.0070762634,0.035888672,-0.004070282,0.037139893,-0.038970947,-0.06958008,0.023803711,-0.018798828,-0.03552246,-0.03186035,-0.011909485,0.025650024,-0.036224365,-0.014984131,0.015274048,-0.0793457,0.025177002,-0.014038086,0.0025405884,0.0016956329,0.02003479,0.031341553,0.00012177229,-0.01876831,-0.0005106926,-0.016647339,-0.035491943,0.0055122375,0.008598328,-0.028747559,0.032928467,-0.0065994263,-0.0030078888,0.019378662,-0.020889282,0.030456543,0.054718018,0.0029945374,-0.07531738,-0.07470703,-0.015792847,-0.0066833496,-0.018066406,-0.0074501038,0.0062217712,-0.020111084,-0.05606079,0.009490967,-0.02796936,0.021850586,-0.037841797,-0.010902405,-0.055603027,0.022232056,-0.0143966675,-0.061462402,-0.013168335,-0.042999268,0.055389404,0.018066406,0.018630981,0.028411865,0.022323608,0.024520874,0.055541992,-0.017242432,-0.0029964447,0.032226562,-0.024230957,0.052856445,-0.0022068024,0.015914917,0.0011806488,0.02331543,0.0713501,0.013267517,-0.033233643,0.0042266846,-0.07305908,-0.042663574,-0.014015198,0.015327454,-0.00020432472,-0.017318726,0.019485474,-0.05606079,-0.027664185,0.026916504,0.008872986,-0.008377075,0.04434204,0.01234436,0.020584106,0.049194336,0.024795532,-0.034576416,0.025970459,0.02406311,0.0043678284,0.0035991669,-0.03289795,0.004798889,0.026916504,-0.031707764,-0.0045166016,-0.012687683,0.000726223,-0.011688232,-0.00017118454,0.0051193237,0.022506714,-0.035827637,-0.045806885,-0.0072784424,0.016815186,0.0024356842,-0.018661499,-0.032928467,-0.07293701,0.03756714,0.021408081,0.044555664,0.0146865845,-0.0012950897,-0.009628296,-0.01525116,-0.06500244,0.032989502,0.06530762,0.003622055,-0.02520752,0.041137695,-0.0020809174,-0.07409668,-0.007446289,-0.015380859,-0.046173096,-0.026535034,0.0072402954,-0.060333252,0.017654419,0.012611389,0.001332283,0.042907715,-0.042297363,-0.03503418,0.0042304993,-0.025985718,0.011421204,-0.030319214,-0.037322998,-0.003484726,0.02355957,0.038757324,0.006877899,-0.0035095215,0.0012149811,0.015838623,-0.006134033,0.009918213,-0.013397217,-0.02368164,0.018676758,-0.0019207001,-0.010116577,-0.0010356903,-0.022705078,0.07861328,-0.05227661,0.032196045,0.006580353,0.0107040405,0.03543091,-0.01210022,-0.061523438,-0.005054474,0.023040771,0.03137207,0.053466797,0.025054932,-0.009651184,-0.013290405,0.06323242,-0.05166626,-0.026428223,0.0149002075,0.03161621,0.023468018,0.028305054,-0.04168701,-0.031921387,-0.0016613007,-0.056518555,0.016845703,-0.008918762,0.0066452026,-0.022476196,0.0158844,-0.02758789,-0.0031585693,-0.011528015,0.016342163,-0.036346436,0.009239197,-0.02230835,-0.027740479,0.011199951,0.014579773,-0.00061416626,0.0335083,0.035980225,0.034057617,-0.016693115,-0.03842163,-0.037750244,-0.017608643,-0.008460999,-0.007194519,0.0018806458,-0.0032253265,0.038085938,-0.029632568,0.0006752014,0.019836426,0.020446777,0.014091492,0.013900757,-0.011131287,-0.064819336,-0.05831909,-0.043304443,-0.0473938,0.005706787,0.029907227,0.0078125,0.038482666,0.00881958,-0.017593384,-0.024856567,0.023742676,-0.06567383,-0.011260986,0.032287598,-0.005180359,-0.017333984,-0.0013837814,0.006969452,0.0121536255,0.022842407,-0.004436493,-0.0010957718,0.07324219,0.03326416,-0.004928589,-0.024139404,0.015098572,0.025039673,0.014862061,-0.023864746,-0.05215454,-0.014053345,0.049560547,-0.03970337,-0.017990112,-0.06390381,0.0395813,0.022567749,0.07659912,0.015670776,0.015159607,0.037139893,0.014205933,0.004058838,-0.03955078,-0.014480591,-0.05328369,-0.010803223,0.02456665,-0.014968872,-0.018997192,-0.017944336,0.028900146,0.015274048,0.01423645,-0.0031833649,0.06008911,-0.017654419,-0.004989624,0.020599365,0.01826477,0.04147339,0.08325195,-0.039733887,0.03842163,-0.0064735413,-0.024215698,0.014579773,0.021194458,-0.019836426,0.0017356873,-0.074523926,0.0003247261,-0.0051956177,-0.030380249,-0.038635254,-0.014015198,-0.010719299,0.033721924,0.038146973,-0.016464233,-0.030212402,-0.010231018,-0.008132935,-0.058624268,-0.00945282,-0.039520264,0.007785797,0.01965332,-0.027801514,0.012107849,-0.0038223267,0.016159058,-0.0010643005,0.05343628,0.040893555,0.003288269,-0.040802002,0.022506714,-0.007095337,0.015731812,0.021240234,0.028076172,0.032470703,0.046142578,0.046966553,0.016220093,-0.020446777,-0.07897949,0.033325195,-0.023544312,-0.0068473816,0.040100098,-0.02230835,-0.004589081,-0.012611389,-0.015045166,-0.0103302,0.00762558,-0.037322998,-0.030456543,0.025482178,-0.030273438,-0.010864258,-0.045684814,-0.02784729,-0.0029087067,0.04574585,0.014480591,0.02458191,-0.04977417,-0.0026855469,0.026809692,-0.008392334,0.037719727,-0.014411926,-0.017837524,-0.009010315,-0.01739502,-0.0149002075,-0.011711121,0.02748108,-0.032409668,-0.006767273,0.018356323,0.03894043,0.009178162,-0.0051574707,-0.0031528473,0.021011353,-0.04928589,0.041870117,0.0118255615,0.07324219,-0.0018262863,-0.009399414,-0.029830933,0.03652954,0.0146484375,0.041870117,-0.05316162,-0.013214111,-0.00459671,0.023483276,0.009643555,-0.041412354,0.013702393,0.0032367706,-0.053527832,-0.05279541,0.02684021,0.001964569,0.036956787,0.018569946,0.0119018555,0.025512695,-0.015213013,0.0039405823,0.022766113,-0.024673462,-0.007701874,-0.01737976,-0.02758789,-0.0071372986,-0.014984131,-0.021759033,0.025115967,-0.008460999,0.017852783,0.004322052,-0.024169922,0.01574707,0.014633179,-0.006225586,0.021621704,0.0049057007,0.015419006,0.059570312,0.032928467,-0.04067993,0.041870117,0.023223877,0.0022392273,-0.0014686584,0.051574707,0.030380249,0.014984131,0.000975132,-0.00762558,-0.01461792,-0.019744873,-0.0008444786,0.0098724365,0.008041382,-0.0037670135,-0.027435303,0.017944336,0.015083313,-0.027770996,-0.017044067,0.019607544,0.016601562,-0.029159546,-0.005508423,0.011070251,0.042907715,-0.0071868896,0.00016784668,-0.018539429,0.032928467,0.04171753,0.0025787354,0.00088214874,0.00080013275,-0.019851685,0.021560669,0.020217896,-0.02784729,0.02053833,0.013999939,0.020233154,0.01727295,0.011886597,-0.013679504,-0.026504517,0.025466919,0.008728027,-0.022994995,0.031982422,0.0013389587,0.029830933,0.0060577393,0.0007443428,0.005580902,-0.013534546,-0.01751709,0.0149383545,0.02848816,0.0025291443,-0.005584717,0.013832092,0.012817383,0.019760132,-0.05142212,0.012260437,0.02130127,0.009796143,-0.03253174,-0.06335449,-0.022705078,-0.037628174,0.025054932,0.00076818466,0.012550354,0.016448975,-0.0006713867,-0.014205933,0.00047945976,0.018569946,-0.007221222,-0.009757996,-0.049957275,-0.020095825,-0.014297485,-0.007587433,0.0016336441,-0.0038928986,-0.041748047,-0.047302246,-0.023010254,-0.032226562,-0.024505615,-0.009117126,-0.0184021,0.027923584,-0.007083893,0.025878906,-0.023849487,-0.0368042,-0.0016155243,-0.005756378,0.027893066,-0.042907715,0.016067505,-0.008911133,0.025665283,-0.013435364,-0.011634827,0.005622864,0.036712646,0.0017642975,0.032806396,-0.045318604,0.02758789,-0.015380859,0.029876709,0.0000859499,-0.034179688,0.00016260147,-0.028381348,-0.0113220215,0.041656494,-0.0013580322,-0.023391724,-0.008346558,-0.034179688,0.0022678375,-0.044891357,0.019256592,-0.004333496,0.024551392,-0.036315918,-0.005783081,0.00024580956,0.019744873,-0.014877319,0.005180359,-0.012771606,0.035736084,0.0050468445,0.030792236,-0.026351929,-0.00995636,0.012748718,0.0073165894,-0.047027588,-0.029464722,-0.0059661865,-0.0077285767,0.0073547363,0.00907135,-0.034729004,-0.03463745,0.012001038,-0.017700195,0.013076782,-0.015060425,0.009117126,0.0021438599,-0.009681702,0.0005135536,0.012413025,0.018173218,0.015586853,0.040496826,-0.0048713684,-0.022628784,-0.0007619858,0.031951904,0.023284912,0.011413574,-0.013755798,-0.03112793,-0.030395508,-0.03250122,-0.015899658,-0.01360321,0.021484375,-0.003452301,0.0088272095,-0.0519104,-0.0011701584,-0.03668213,-0.0016489029,0.03161621,-0.0074005127,0.022003174,-0.012489319,0.02180481,-0.0131073,-0.00623703,-0.025283813,0.0057868958,0.01007843,-0.0052871704,0.01600647,0.026809692,-0.0047950745,-0.026763916,-0.006252289,-0.00447464,0.0055389404,-0.008232117,0.00022828579,-0.0031604767,0.007835388,0.008758545,0.017807007,-0.022064209,0.00085020065,0.061920166,-0.009056091,-0.0071868896,-0.008285522,-0.014595032,0.020706177,0.029190063,-0.049438477,0.010536194,-0.028884888,0.026473999,-0.025024414,0.006198883,0.0029239655,0.040802002,-0.03466797,-0.05441284,0.0024852753,0.0006489754,-0.013191223,-0.053466797,-0.023223877,-0.07397461,0.0057029724,-0.004146576,-0.0368042,0.0064468384,0.018432617,-0.022888184,-0.08258057,-0.008369446,0.045776367,0.030319214,0.015029907,0.010368347,0.027770996,0.0068893433,-0.017715454,0.0035057068,0.017745972,-0.042541504,-0.0058670044,-0.025756836,0.048034668,0.016586304,-0.015434265,0.019882202,0.014022827,0.036712646,-0.011161804,0.023727417,-0.03466797,0.009841919,-0.01146698,0.011024475,-0.016204834,0.008468628,0.039123535,-0.06213379,0.022018433,0.0076560974,0.025482178,0.017425537,0.013366699,0.027145386,-0.041107178,-0.0028514862,0.0129776,0.0060653687,0.053588867,-0.02822876,0.0034542084,-0.00040745735,-0.0021781921,-0.021026611,-0.032226562,-0.020568848,-0.024734497,-0.020217896,0.028213501,0.02406311,-0.010864258,-0.009780884,0.016571045,0.009185791,-0.002960205,0.010986328,-0.02557373,-0.010749817,-0.045837402,0.00051164627,0.020019531,0.0014533997,-0.01737976,0.03363037,0.042510986,0.025634766,0.0070114136,-0.021987915,-0.013946533,0.024856567,-0.0017499924,-0.02015686,0.0345459,-0.0077400208,0.029373169,0.013793945,0.014724731,-0.041137695,-0.0390625,-0.026473999,0.0029182434,0.0154953,-0.013946533,0.0041656494,0.020767212,0.004257202,-0.012718201,-0.03491211,0.013183594,-0.030960083,-0.037994385,-0.01676941,-0.01386261,0.034454346,0.0068511963,-0.02368164,0.01398468,0.0063285828,0.03967285,0.0007901192,0.005378723,0.025970459,0.03062439,0.01689148,-0.024795532,0.0022182465,-0.017593384,-0.021606445,-0.008956909,-0.01260376,-0.0017385483,0.025390625,-0.006454468,0.0021686554,0.02986145,0.03930664,0.008117676,-0.0009627342,0.010040283,0.04232788,-0.009033203,0.026657104,-0.031433105,0.022964478,0.0181427,0.0012903214,-0.022369385,-0.0056533813,-0.017410278,0.041748047,0.016723633,-0.011276245,0.039520264,-0.009719849,0.037994385,-0.029632568,-0.020980835,-0.0023326874,-0.010986328,-0.00894928,0.015136719,0.023468018,0.0047912598,0.040283203,-0.038024902,0.0073547363,-0.008834839,0.017303467,0.011955261,-0.007194519,-0.015396118,-0.020065308,0.0047073364,-0.025360107,-0.03149414,-0.005340576,-0.017486572,0.06982422,0.0041046143,0.008811951,0.028640747,0.021560669,0.020126343,-0.032958984,-0.031433105,0.009544373,-0.021072388,0.016433716,-0.035888672,0.035247803,0.052856445,0.0021972656,0.050109863,0.011230469,0.038757324,0.019210815,-0.0056533813,-0.015068054,0.010520935,-0.019622803,0.012504578,-0.016342163,0.04434204,-0.035583496,-0.0051879883,-0.0049362183,0.038330078,-0.0155181885,0.02381897,0.05795288,0.037353516,-0.014564514,0.035705566,0.000100791454,-0.040924072,-0.0118255615,-0.020523071,0.049957275,0.0036525726,0.016662598,0.04852295,0.016616821,0.0061149597,0.0065612793,-0.012702942,-0.029220581,0.031280518,0.043121338,-0.01890564,-0.022415161,-0.007572174,-0.008972168,-0.026123047,-0.0109939575,0.01826477,-0.00088977814,0.026062012,-0.0041885376,-0.0048446655,-0.023483276,0.020812988,0.028518677,-0.0027580261,-0.011001587,0.0181427,0.0011768341,0.0015296936,0.010864258,-0.004524231,0.0035171509,-0.024978638,-0.024261475,0.015266418,0.024749756,-0.0019683838,-0.022644043,0.0063285828,0.011734009,0.028442383,0.028823853,-0.030792236,0.0011787415,0.0063552856,0.011650085,0.015380859,0.04916382,0.0039405823,0.022613525,0.038208008,0.031707764,0.018539429,-0.039611816,0.0021247864,0.01637268,0.01374054,0.009231567,-0.006511688,0.01902771,-0.023590088,0.034179688,0.009208679,-0.0016584396,0.013252258,0.016494751,-0.012001038,-0.0027160645,0.020950317,0.014862061,-0.024932861,-0.0046463013,0.0062446594,-0.01210022,0.0067367554,0.016677856,0.033813477,-0.018966675,0.055603027,0.024002075,-0.027923584,-0.016159058,0.019363403,-0.022766113,-0.00019967556,-0.006351471,-0.008644104,-0.046447754,0.027923584,-0.0035190582,0.019989014,0.026062012,-0.007637024,-0.016998291,0.009246826,0.023101807,0.03414917,0.0010671616,-0.0030765533,-0.03314209,0.018447876,0.035491943,-0.008239746,0.0055007935,-0.012207031,-0.014724731,0.009521484,0.007709503,-0.0009379387,-0.009529114,-0.02130127,-0.035095215,0.019927979,0.018936157,-0.0025615692,0.05203247,-0.023025513,-0.019180298,0.002412796,0.013977051,0.0113220215,-0.006034851,-0.003206253,0.027816772,-0.02748108,0.03060913,0.037017822,0.0034675598,0.031204224,0.01272583,-0.013305664,-0.0052337646,-0.00793457,0.034332275,-0.0368042,-0.014862061,0.008773804,0.004009247,-0.016815186,-0.029083252,0.0031394958,-0.004562378,-0.00705719,-0.016235352,0.019607544,0.009239197,0.016113281,0.01826477,0.026611328,-0.016281128,0.06365967,-0.004611969,0.03213501,-0.0109939575,0.0012359619,0.045959473,0.01285553,0.05279541,0.0063667297,0.002445221,-0.029052734,0.00039863586,0.00944519,0.0072898865,0.030548096,0.014633179,-0.03302002,0.03878784,-0.018249512,0.042388916,0.0090789795,-0.009216309,0.006011963,-0.012794495,-0.0110321045,0.004676819,-0.011787415,0.01966858,0.031799316,-0.016433716,-0.012817383,-0.0096588135,-0.021240234,0.020111084,-0.012229919,0.011489868,0.00548172,-0.0004963875,0.009231567,-0.012634277,-0.001077652,0.0006380081,0.03378296,-0.037322998,-0.015312195,0.018920898,0.021743774,-0.017501831,0.028137207,0.053894043,0.0047683716,0.0073051453,0.036956787,-0.014526367,0.035369873,0.00737381,0.030426025,0.03503418,-0.0034389496,0.0035133362,0.030349731,0.0018148422,-0.02079773,0.014633179,0.020492554,-0.005558014,0.0001077652,0.020568848,0.017150879,-0.0069885254,-0.004535675,-0.013809204,0.009719849,-0.010017395,-0.011688232,0.0008587837,0.012283325,0.0018806458,0.0102005005,-0.0022792816,-0.0011930466,0.02885437,0.04562378,0.03527832,-0.038330078,-0.013290405,0.020568848,0.026535034,-0.011665344,-0.015197754,-0.014167786,-0.02470398,-0.019256592,0.01373291,-0.0070648193,0.022216797,-0.038604736,-0.012962341,0.0418396,0.00806427,0.030715942,0.013420105,-0.018508911,0.021408081,0.00048828125,-0.0054397583,0.0014600754,-0.018325806,0.021362305,0.026550293,-0.0066184998,-0.021438599,0.016571045,-0.017807007,-0.006095886,0.027282715,0.0011739731,0.022644043,-0.015609741,0.015602112,0.0066337585,0.00548172,-0.011146545,-0.021896362,0.012664795,0.017990112,0.049041748,-0.010757446,-0.0015392303,0.029312134,0.026947021,0.0055618286,0.050689697,-0.0060920715,0.0385437,0.012046814,-0.018188477,-0.011405945,0.015838623,-0.009094238,-0.030395508,0.011077881,-0.044830322,-0.033325195,0.026550293,-0.0000015497208,-0.0052337646,-0.034301758,0.0033493042,-0.012672424,-0.017181396,0.017578125,0.016784668,0.0015010834,-0.0036201477,0.0030441284,0.023880005,-0.040130615,-0.039642334,-0.0065345764,0.0021038055,-0.033691406,-0.05014038,0.00207901,0.0040016174,-0.002368927,-0.02507019,-0.0030059814,-0.0082092285,0.035858154,-0.011390686,-0.012008667,-0.005039215,0.02293396,0.028381348,-0.0006737709,0.016784668,-0.030059814,-0.024337769,-0.024658203,0.030715942,-0.017593384,0.0395813,-0.0062446594,0.02116394,0.011886597,-0.016082764,0.0029468536,0.011123657,-0.004962921,-0.0024204254,-0.02658081,-0.026611328,0.02255249,0.029541016,-0.004032135,-0.018203735,0.03765869,-0.02796936,-0.0044784546,0.034484863,0.02230835,0.0079956055,0.001950264,-0.000011444092,-0.0004708767,-0.021270752,0.0115737915,-0.026657104,-0.0016088486,-0.023849487,0.025131226,0.0026512146,0.01864624,0.012573242,-0.0025978088,-0.02041626,0.029876709,0.025817871,0.012458801,0.017181396,0.024658203,-0.022567749,-0.0098724365,-0.021850586,0.016174316,0.034332275,0.014556885,0.020889282,-0.011177063,-0.0035133362,-0.016586304,0.038391113,0.026657104,-0.009262085,-0.02911377,-0.009338379,-0.048461914,0.03515625,-0.0050086975,0.016586304,-0.0017118454,0.034301758,0.0024814606,-0.055786133,-0.024551392,0.062042236,0.008003235,-0.0059013367,-0.025161743,0.017959595,0.015106201,-0.043121338,0.008720398,-0.039489746,-0.022232056,-0.0026512146,-0.00308609,0.019561768,0.007194519,-0.01914978,-0.005832672,-0.0071411133,0.02558899,0.024810791,0.011306763,-0.021743774,-0.00007236004,0.0027942657,0.014053345,-0.005329132,-0.016342163,0.0037136078,0.002521515,0.0032863617,-0.02305603,0.017974854,-0.03161621,0.017211914,-0.00010704994,-0.009361267,0.015274048,-0.0017566681,0.013473511,-0.01725769,0.0007343292,-0.0003569126,0.014930725,0.04852295,-0.02406311,-0.033325195,0.001789093,-0.010574341,-0.02897644,-0.017623901,-0.005645752,0.014709473,-0.0418396,0.025650024,-0.008079529,-0.006767273,0.01386261,0.0058174133,-0.014480591,-0.009155273,0.030349731,0.013938904,0.0051651,-0.008583069,-0.009124756,-0.03366089,-0.03161621,0.0033187866,0.0027179718,0.0037136078,0.021362305,0.003944397,0.04547119,-0.0057792664,0.023162842,0.0132369995,0.025650024,0.033599854,0.022262573,0.03970337,0.011619568,-0.032836914,0.008323669,0.0032176971,-0.03668213,0.016586304,-0.013626099,-0.0158844,-0.026229858,0.0016307831,-0.00944519,0.010063171,0.017166138,0.004081726,-0.009559631,0.008995056,-0.033172607,-0.011039734,-0.01423645,-0.0059547424,0.0463562,0.012275696,0.0073928833,-0.01033783,-0.0073623657,0.046966553,0.05697632,-0.004802704,0.0041885376,-0.011108398,0.027053833,-0.008010864,-0.0012340546,0.0014381409,-0.021255493,-0.010116577,-0.009742737,-0.015716553,0.015136719,-0.024307251,0.0027751923,0.0085372925,-0.023788452,-0.021240234,0.021560669,-0.017333984,-0.011993408,0.0104904175,-0.0003619194,0.010025024,0.0284729,-0.006248474,0.0087509155,0.017990112,-0.043182373,0.046905518,0.0052871704,0.0065307617,0.008743286,-0.00089740753,-0.018997192,-0.020584106,-0.006389618,-0.00957489],"createdAt":"2026-04-21T18:32:31.430Z","updatedAt":"2026-04-22T10:03:09.136Z","lastSeenAt":"2026-04-22T10:03:09.136Z","tsv":"'/api':179 '/api/v1/nfts/43/owner':153 '/pricing':180 '/readme':182 '0.02':11,24,68,138 '000':71 '0x8335':60 '1':170 '20':70 '2913':61 '402':165 '43':36 '6':75 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'account':80 'advertis':104 'ai/ml':112 'analysi':115 'analyt':111 'api':78,108 'attach':88 'base':9,22,55,72 'base-network' 'beyond':172 'broader':101 'call':42,63,228 'caller':86 'challeng':166 'classif':117 'connect':189 'contract':59 'convers':133 'cost':64 'cover':150 'data':4,17,110,220 'decim':76 'descript':208 'detail':196 'discov':223 'document':171 'embed':118 'endpoint':28,46,156,158 'estim':127 'exact':215 'exampl':203 'exchang':122 'feed':121 'finance/web3':119 'gas':126 'generat':134 'geocod':131 'header':93 'howev':146 'infer':113 'infrastructur':129 'key':79 'land':174 'limit':83 'list':149 'live':160 'lowpaymentfee.com':30,102 'make':225 'maximum':66 'micropay':7,20 'minim':188 'model':145 'must':221 'network':56 'nft':2,15,35,154 'nft-ownership-lookup' 'no-api-key' 'on-chain NFT data' 'openapi':200 'owner':33 'ownership':3,16,155 'page':175,183 'paid':227 'pay':40 'pay-per-cal':39 'pay-per-request' 'payload':205 'payment':92,98 'per':12,25,41,139 'platform':103 'post':48 'price':120,136 'prompt':191 'proof':99 'proper':164 'protocol':44 'queri':1,14 'quot':125 'rate':82,123 'request':13,26,49,140 'request/response':204 'requir':85 'resolv':185 'respons':211 'return':31,162,219 'schema':212 'sentiment':114 'settl':52 'shape':216 'simpli':87 'span':109 'spars':177 'spec':201 'specif':148 'suit':106 'summar':116 'technic':195 'token':124 'unit':73 'usdc':58,69 'usdc-settlement' 'use':57 'util':130 'valid':96,132 'version':169 'via':5,18,37 'wallet':190 'who owns NFT' 'x':91 'x-payment':90 'x402':6,19,43,97,144,168 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"2370e99f-8248-4458-ba48-1570597b4be2","listingId":"41ab4100-005f-47a0-b6fa-141653ec5556","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/43/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":"2026-04-21T18:32:31.430Z"}],"sources":[{"listingId":"41ab4100-005f-47a0-b6fa-141653ec5556","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/43/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.430Z","lastSeenAt":"2026-04-22T10:03:09.136Z"}],"details":{"listingId":"41ab4100-005f-47a0-b6fa-141653ec5556","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/43/owner \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 version 1 challenge, accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/nfts/43/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/43/owner"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Ancillary pages /api, /pricing, /README show only 'Connect wallet' with no documentation","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Verify the current owner of a specific NFT programmatically","Integrate NFT ownership checks into automated agent workflows","Build dashboards or alerts that track NFT ownership changes"],"bestFor":["Agents needing on-demand NFT ownership data without managing API keys","Developers prototyping x402 payment flows on Base","Low-volume, pay-as-you-go NFT data queries"],"notFor":["Bulk or batch NFT ownership queries across large collections (no batch endpoint documented)","Users who need detailed NFT metadata beyond ownership","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.337Z"},"updatedAt":"2026-04-22T10:03:09.136Z"}}