{"id":"11e9cb05-e65f-40c8-b8dd-e676d2cd12df","shortId":"AuuwyF","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 #55 via a pay-per-call x402 protocol. The endpoint accepts POST requests and settles payments 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 hosts a broader suite of APIs across data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint (`/api/v1/nfts/55/owner`) appears to be an NFT ownership lookup, though the crawled documentation does not provide detailed schema information about the request body or response format beyond the x402 challenge metadata. The response MIME type is application/json.\n\nBecause there is no OpenAPI spec, no detailed endpoint documentation, and no example request/response payloads available from the crawl, the exact fields accepted in the POST body and the structure of the returned owner data are unknown. Callers should expect a JSON response containing at minimum an owner address for the specified NFT.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","ERC-721 owner","NFT metadata","on-chain ownership","x402 NFT API"],"warnings":["No OpenAPI or schema documentation available — request body and response structure are unknown","Endpoint path is hardcoded to NFT #55; unclear if other NFT IDs are supported via different paths","Provider landing page lists many API categories but none link to detailed docs; /api, /pricing, and /README pages only show 'Connect wallet'","The existing title and description ('Premium API Access') are generic and do not describe actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/55/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/55/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no endpoint documentation, no example request/response, and the endpoint path is hardcoded to a single NFT ID. The provider description is generic ('Premium API Access') and the crawl yielded minimal useful detail.","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":"2026-04-21T23:37:58.729Z","embedding":[-0.015136719,-0.028167725,0.042785645,0.007282257,0.004627228,-0.06311035,-0.016159058,0.023361206,0.026382446,-0.049621582,0.048309326,-0.019729614,-0.024627686,-0.0637207,-0.048187256,-0.00630188,-0.025497437,-0.022918701,-0.023529053,0.011802673,0.0569458,-0.0042533875,-0.014884949,0.0018377304,-0.010559082,0.0047721863,-0.04058838,-0.011871338,-0.021759033,-0.029632568,0.021118164,-0.025100708,0.00017237663,0.019058228,-0.037353516,-0.00081157684,-0.01828003,0.002735138,0.0017280579,-0.02722168,0.025054932,-0.045776367,0.024902344,-0.006767273,-0.03970337,-0.016525269,-0.0003566742,-0.021972656,0.017730713,0.016311646,-0.014785767,-0.002773285,-0.015586853,0.021469116,-0.008125305,0.028442383,0.019729614,-0.012184143,-0.008544922,0.032440186,-0.014015198,-0.07952881,0.012649536,-0.00013566017,0.034301758,0.03604126,-0.03237915,0.07623291,0.0126571655,0.054534912,0.013801575,0.07287598,-0.012031555,0.0115356445,0.0024757385,-0.029907227,0.00009274483,0.044708252,-0.026550293,-0.04510498,-0.01096344,-0.03475952,-0.028503418,-0.017211914,-0.009513855,-0.03564453,-0.016967773,-0.010795593,-0.061553955,-0.003332138,-0.067871094,0.015731812,-0.000623703,-0.01713562,0.02330017,-0.046813965,-0.008255005,0.0008330345,0.02204895,0.0036811829,-0.0104599,-0.008483887,0.019210815,0.017288208,0.027755737,0.05709839,0.013259888,-0.0018339157,-0.0040740967,0.012237549,-0.050750732,0.036712646,0.0026569366,-0.029006958,-0.021759033,0.009132385,-0.03338623,0.013412476,-0.02432251,0.0473938,-0.016845703,0.017150879,0.01890564,-0.005680084,0.005458832,-0.029525757,-0.004135132,0.0051002502,-0.022979736,0.0067749023,0.027450562,0.00522995,0.030029297,-0.01864624,-0.08166504,-0.00053071976,-0.028869629,-0.030654907,-0.020080566,-0.027755737,0.0231781,-0.04043579,-0.008178711,0.021087646,-0.08453369,0.008964539,0.005695343,-0.005138397,-0.00021386147,0.022476196,0.029144287,0.014076233,-0.016143799,-0.0005865097,-0.02142334,-0.032928467,0.0059127808,0.007106781,-0.030029297,0.026397705,0.013664246,-0.01335907,-0.004901886,0.0027580261,0.04196167,0.044281006,0.013549805,-0.059753418,-0.06225586,0.00541687,-0.008674622,-0.038116455,-0.0070762634,0.015159607,-0.029022217,-0.058135986,0.008865356,-0.035339355,0.016479492,-0.03878784,-0.0037212372,-0.047332764,0.018493652,-0.018936157,-0.068725586,-0.017349243,-0.032287598,0.052612305,0.028121948,0.015472412,0.026306152,0.0015449524,0.013374329,0.04928589,-0.019241333,-0.011917114,0.034576416,-0.029342651,0.04055786,0.0042648315,0.016311646,-0.008224487,0.025817871,0.06945801,0.02305603,-0.03439331,0.007007599,-0.051757812,-0.04815674,-0.0000104904175,0.0041885376,-0.0008006096,-0.016479492,0.008735657,-0.051452637,-0.027999878,0.026245117,0.0048294067,-0.014175415,0.03781128,0.010475159,0.044281006,0.050750732,0.019256592,-0.036193848,0.024795532,0.016159058,0.00274086,0.0019683838,-0.033996582,-0.012237549,0.03286743,-0.029144287,-0.01448822,-0.022994995,0.010475159,-0.0126571655,0.008323669,-0.0008764267,0.027557373,-0.03817749,-0.033935547,0.008865356,0.01737976,-0.009010315,-0.012168884,-0.032226562,-0.05633545,0.037353516,0.028442383,0.043762207,0.0069389343,-0.00043559074,-0.009223938,-0.026000977,-0.0725708,0.04840088,0.06842041,0.0031585693,-0.013076782,0.050323486,-0.0095825195,-0.06945801,0.0017309189,-0.030319214,-0.051849365,-0.014823914,-0.0046081543,-0.056396484,0.012260437,-0.0007429123,0.0048599243,0.03768921,-0.038360596,-0.045837402,0.0101623535,-0.030273438,0.01473999,-0.012359619,-0.04736328,-0.005970001,0.031707764,0.031097412,-0.004047394,0.0053863525,-0.0042266846,0.024765015,-0.010391235,0.012680054,-0.0043525696,-0.009498596,0.012786865,-0.00705719,-0.0206604,-0.010658264,-0.016677856,0.06829834,-0.045318604,0.045837402,0.015037537,0.0042877197,0.054595947,0.0025596619,-0.05834961,-0.0046691895,0.012191772,0.032592773,0.06317139,0.026794434,-0.013252258,-0.001625061,0.050750732,-0.03805542,-0.016067505,0.011421204,0.032592773,0.020568848,0.04067993,-0.031341553,-0.02520752,0.0030326843,-0.04196167,0.022094727,-0.008003235,0.0015707016,-0.030075073,0.017730713,-0.03149414,-0.004032135,-0.0018968582,0.01991272,-0.030517578,-0.0061187744,-0.022506714,-0.014625549,0.018096924,0.00038051605,-0.014976501,0.0362854,0.028945923,0.03463745,-0.013786316,-0.028930664,-0.05734253,-0.03326416,0.0012359619,-0.016159058,0.0054626465,-0.027267456,0.034942627,-0.022125244,0.0129776,0.004436493,0.013725281,0.012825012,0.015434265,-0.011070251,-0.060760498,-0.053588867,-0.028121948,-0.04360962,0.000081181526,0.032409668,0.015060425,0.037261963,0.0259552,-0.022216797,-0.014846802,0.041778564,-0.06768799,-0.018371582,0.026321411,-0.012466431,-0.01737976,0.009750366,0.0065307617,0.0019216537,0.020568848,0.017730713,-0.0037841797,0.08062744,0.029418945,-0.0076942444,-0.024246216,0.019546509,0.024459839,0.02067566,-0.02041626,-0.058807373,-0.028930664,0.031951904,-0.019714355,-0.019577026,-0.06555176,0.024642944,0.02168274,0.072387695,0.022506714,0.011245728,0.043670654,0.01474762,-0.0129776,-0.02532959,-0.010948181,-0.05026245,-0.005672455,0.0026741028,-0.027770996,-0.018096924,-0.03829956,0.053253174,-0.008842468,0.011703491,-0.014862061,0.062347412,-0.0023078918,-0.0034713745,0.015052795,0.0025482178,0.04168701,0.08532715,-0.030776978,0.03189087,-0.0015420914,-0.016708374,0.013252258,0.01965332,-0.014762878,0.007888794,-0.06744385,-0.0056152344,-0.0057296753,-0.009300232,-0.04486084,-0.011154175,0.008087158,0.04534912,0.036895752,-0.007701874,-0.03463745,-0.008155823,-0.016525269,-0.047729492,-0.0067481995,-0.044036865,0.009460449,0.028793335,-0.024093628,0.016464233,-0.0016345978,0.027618408,0.0061798096,0.040802002,0.028778076,0.005115509,-0.048858643,0.03277588,-0.0060157776,0.019210815,0.017059326,0.025009155,0.01939392,0.044189453,0.035858154,0.0072746277,-0.02293396,-0.074279785,0.020751953,-0.018096924,-0.010391235,0.035369873,-0.02734375,0.008323669,-0.024978638,-0.016616821,-0.0027332306,0.009483337,-0.041809082,-0.023391724,0.024917603,-0.030349731,-0.022094727,-0.034484863,-0.025543213,-0.0039138794,0.052246094,0.026382446,0.028442383,-0.04058838,0.0009264946,0.022598267,-0.004245758,0.023468018,-0.013465881,-0.024597168,-0.011909485,-0.006713867,-0.019805908,-0.011070251,0.010643005,-0.03552246,0.0014677048,0.019042969,0.048980713,0.013946533,0.010292053,-0.0035648346,0.021102905,-0.04763794,0.043640137,0.016708374,0.07659912,-0.025756836,-0.007095337,-0.037963867,0.022720337,0.0028038025,0.028900146,-0.050720215,-0.009178162,-0.011421204,0.023010254,-0.0026569366,-0.03353882,0.024261475,0.012260437,-0.053100586,-0.06347656,0.034851074,0.0074691772,0.043945312,0.026245117,0.009346008,0.03555298,-0.0060195923,-0.016357422,0.033081055,-0.023223877,-0.0032310486,0.0046081543,-0.030853271,-0.028045654,-0.011665344,-0.01939392,0.03970337,0.0049972534,0.006511688,0.0017652512,-0.012496948,0.012786865,0.015792847,-0.0062446594,0.020141602,0.013000488,0.017959595,0.06707764,0.024627686,-0.030807495,0.038360596,0.016906738,0.0021324158,0.003080368,0.048339844,0.035705566,0.020645142,0.012611389,-0.011253357,-0.0062446594,-0.010070801,-0.010543823,0.0021743774,-0.0041770935,0.021133423,-0.020767212,0.009628296,0.016784668,-0.03656006,-0.010520935,0.022964478,0.010719299,-0.017333984,-0.010398865,0.010253906,0.047454834,-0.01826477,0.0014686584,-0.010848999,0.030944824,0.036743164,-0.0016527176,0.0014390945,0.0012588501,0.004924774,0.03564453,0.03552246,-0.041107178,0.015731812,0.0064735413,0.015403748,0.009475708,0.019897461,-0.016204834,-0.025238037,0.0066375732,-0.00061798096,-0.032104492,0.038085938,-0.0003848076,0.031951904,0.013061523,0.0035095215,0.007827759,-0.0099487305,-0.016647339,0.007835388,0.029525757,-0.0045051575,-0.012207031,0.007873535,0.0007162094,0.030548096,-0.04638672,0.019866943,0.023086548,0.0013694763,-0.022232056,-0.06262207,-0.016906738,-0.045013428,0.017242432,-0.0004348755,0.0077934265,0.008834839,-0.008155823,-0.010513306,0.0098724365,0.022140503,0.0009126663,-0.0071754456,-0.033081055,-0.0069732666,-0.026031494,0.0008764267,0.013809204,-0.003627777,-0.054107666,-0.048614502,-0.023956299,-0.024871826,-0.012634277,-0.022415161,-0.021957397,0.02027893,-0.035369873,0.0082092285,-0.021194458,-0.037261963,-0.004547119,-0.0001411438,0.028396606,-0.042938232,0.010673523,-0.009986877,0.029251099,-0.012802124,0.00032138824,0.009429932,0.021850586,0.0011768341,0.038635254,-0.04296875,0.023529053,-0.007549286,0.024337769,0.004600525,-0.034362793,0.00018489361,-0.015335083,-0.006500244,0.035095215,0.006313324,-0.020080566,-0.014259338,-0.048309326,0.004753113,-0.045043945,0.031204224,0.000068962574,0.022659302,-0.025894165,-0.011756897,-0.0040359497,0.01878357,-0.011688232,0.010131836,-0.0030384064,0.024246216,0.021606445,0.029769897,-0.022033691,-0.018005371,0.018508911,0.009933472,-0.042236328,-0.031311035,-0.021957397,-0.017486572,0.0065956116,0.008529663,-0.029693604,-0.027954102,0.0098724365,-0.026168823,0.020492554,-0.00806427,0.0069007874,0.0146865845,0.00086402893,0.005039215,0.0041999817,0.017623901,0.027374268,0.043029785,-0.0066490173,-0.015701294,-0.012908936,0.042785645,0.028396606,0.0063476562,-0.0021305084,-0.03857422,-0.021621704,-0.03829956,-0.010040283,-0.011009216,0.03466797,-0.0031967163,0.012649536,-0.06149292,0.0032615662,-0.04046631,-0.02029419,0.016326904,-0.017868042,0.022247314,-0.00868988,0.027770996,-0.017364502,-0.007369995,-0.021850586,0.009880066,0.008972168,-0.010925293,0.021392822,0.030929565,-0.0135650635,-0.016830444,-0.013946533,-0.014671326,0.01889038,-0.015899658,-0.012886047,-0.004486084,-0.0009713173,0.016540527,-0.0019283295,-0.021255493,-0.00012779236,0.055236816,-0.014350891,-0.0043678284,-0.016067505,-0.014709473,0.017852783,0.031051636,-0.050994873,0.008934021,-0.02532959,0.030807495,-0.019195557,0.009101868,0.003967285,0.047180176,-0.026245117,-0.054138184,0.0039138794,0.0019016266,-0.016403198,-0.0362854,-0.023086548,-0.064453125,0.015052795,-0.010887146,-0.036621094,0.006904602,0.012184143,-0.025314331,-0.0826416,-0.009689331,0.038269043,0.022155762,0.011497498,0.005596161,0.023376465,0.0030269623,-0.024719238,0.000395298,-0.00049591064,-0.050567627,-0.00046014786,-0.048858643,0.045288086,0.024230957,-0.023529053,0.021377563,-0.0011062622,0.022994995,-0.016220093,0.024429321,-0.02067566,0.008094788,-0.024963379,0.0078048706,-0.00969696,-0.011062622,0.032562256,-0.058441162,0.024032593,0.015792847,0.025604248,0.025650024,0.007896423,0.013748169,-0.031082153,-0.014984131,0.012321472,0.0033836365,0.052001953,-0.031463623,0.005252838,-0.0060768127,-0.0072364807,-0.00894165,-0.03616333,-0.027374268,-0.027252197,-0.015571594,0.031555176,0.00522995,0.007095337,-0.006626129,0.008674622,0.013671875,0.0012321472,-0.0012350082,-0.027496338,-0.038085938,-0.04324341,-0.003955841,0.025466919,-0.012771606,-0.005859375,0.034362793,0.028518677,0.023666382,0.014328003,-0.028930664,-0.0087509155,0.016281128,-0.009559631,-0.009429932,0.036010742,-0.010597229,0.016143799,0.018081665,0.01828003,-0.03894043,-0.03704834,-0.021652222,0.0055770874,0.025177002,-0.004295349,0.0063171387,0.014373779,0.017456055,-0.0129776,-0.033691406,-0.005748749,-0.021316528,-0.032989502,-0.015838623,-0.022003174,0.023895264,0.0015659332,-0.023406982,0.008338928,0.00617218,0.03274536,0.003358841,0.026428223,0.03173828,0.029129028,0.0039520264,-0.023864746,0.013290405,-0.0129470825,-0.01902771,-0.005657196,-0.017074585,-0.0003926754,0.02166748,-0.00447464,-0.009292603,0.0209198,0.021270752,0.010940552,-0.0065078735,0.017227173,0.039489746,-0.002149582,0.017425537,-0.02381897,0.01876831,0.015625,-0.010627747,-0.02947998,0.00919342,-0.0065574646,0.042266846,0.013885498,-0.020370483,0.031341553,-0.014846802,0.047424316,-0.02949524,-0.017456055,-0.020980835,-0.008628845,-0.002735138,0.014137268,0.023361206,0.00806427,0.043395996,-0.043121338,0.022003174,0.0015630722,0.010528564,0.002796173,-0.012428284,-0.013626099,-0.00983429,0.008720398,-0.018630981,-0.032592773,-0.0063171387,-0.014312744,0.08178711,0.00422287,0.0064315796,0.033355713,0.017440796,0.015541077,-0.034484863,-0.026870728,0.0016841888,-0.019607544,0.014434814,-0.041656494,0.037597656,0.05050659,0.0098724365,0.044677734,0.0058517456,0.037017822,0.025482178,0.0042648315,-0.013046265,0.010665894,-0.005504608,0.01713562,-0.020492554,0.051605225,-0.031433105,0.00003838539,-0.013198853,0.034454346,-0.013175964,0.016494751,0.063964844,0.037322998,-0.019119263,0.047332764,0.0074920654,-0.0413208,-0.007713318,-0.012138367,0.033294678,0.022262573,0.02154541,0.041809082,0.015838623,0.010673523,0.0036621094,-0.011016846,-0.031143188,0.025970459,0.049713135,-0.026321411,-0.017120361,-0.0040893555,-0.018432617,-0.04244995,-0.01146698,0.018737793,-0.0099487305,0.021820068,-0.0023002625,0.0082092285,-0.018707275,0.016693115,0.022994995,0.0026378632,-0.0064697266,0.026473999,0.01008606,-0.0039901733,0.0128479,0.0023918152,-0.00969696,-0.031463623,-0.025115967,0.016067505,0.03186035,-0.001367569,-0.029327393,0.0014286041,0.0041923523,0.01876831,0.019424438,-0.021118164,0.0042495728,0.009780884,0.003583908,0.012550354,0.039031982,0.012176514,0.027954102,0.036834717,0.015541077,0.01876831,-0.042785645,0.0035877228,0.019622803,0.025619507,0.006801605,0.0016746521,0.017242432,-0.013298035,0.035064697,0.013160706,-0.008346558,0.016143799,0.0099105835,-0.009490967,-0.00038909912,0.022567749,0.009742737,-0.014076233,-0.0029182434,-0.004623413,-0.015487671,0.018249512,0.018234253,0.030975342,-0.007255554,0.05670166,0.021057129,-0.03100586,-0.026382446,0.014175415,-0.02960205,-0.002696991,-0.016693115,-0.0054092407,-0.039764404,0.0390625,-0.0026397705,0.025802612,0.027252197,-0.0068626404,-0.017349243,0.014785767,0.029647827,0.0390625,-0.004798889,0.0023956299,-0.03314209,0.019073486,0.03604126,-0.008293152,0.0034275055,-0.0184021,-0.008331299,0.0073051453,0.0044136047,0.0036468506,-0.028900146,-0.029403687,-0.048980713,0.013412476,0.019256592,0.0055885315,0.046295166,-0.0104599,-0.013786316,-0.002161026,0.021713257,-0.0010137558,-0.0074386597,-0.010147095,0.024505615,-0.016220093,0.031341553,0.045837402,-0.0058631897,0.03250122,0.015235901,-0.023742676,-0.00592041,-0.000323534,0.03074646,-0.032592773,-0.018569946,-0.0076446533,-0.0016031265,-0.014328003,-0.023605347,0.0009727478,-0.0047073364,-0.016784668,-0.024902344,0.016555786,0.0090408325,0.004917145,0.020889282,0.021560669,-0.016418457,0.057800293,-0.009628296,0.033203125,-0.015449524,0.0056495667,0.039794922,0.015914917,0.04638672,0.019943237,0.0078048706,-0.02053833,-0.0012350082,-0.00053453445,0.004928589,0.031463623,0.014312744,-0.035186768,0.045898438,-0.019119263,0.041748047,0.0075798035,-0.016342163,0.01133728,-0.004798889,0.0023975372,0.008850098,-0.015808105,0.00869751,0.028778076,-0.020614624,-0.010070801,-0.012512207,-0.019744873,0.017486572,-0.009552002,-0.003730774,-0.0022621155,0.008018494,0.00819397,-0.007904053,0.0066986084,-0.008934021,0.0317688,-0.03918457,-0.011703491,0.017730713,0.024780273,-0.015335083,0.03164673,0.052764893,-0.005886078,0.002937317,0.030395508,-0.017547607,0.025924683,-0.008178711,0.021133423,0.036712646,0.015037537,0.006576538,0.044830322,0.0004210472,-0.035888672,0.014625549,0.026351929,-0.010253906,-0.009880066,0.018173218,0.020645142,-0.0068626404,-0.0053863525,-0.01600647,-0.00289917,-0.013427734,-0.010810852,-0.0011587143,0.024459839,0.012886047,0.0018482208,-0.0024757385,0.0021247864,0.029342651,0.04071045,0.036499023,-0.029403687,-0.0050315857,0.013961792,0.027175903,-0.0087890625,-0.007507324,-0.0010223389,-0.030853271,-0.021194458,0.012672424,-0.01689148,0.020553589,-0.039764404,-0.025680542,0.051452637,0.014411926,0.033294678,0.03173828,-0.0054893494,0.047027588,-0.0040245056,-0.0076293945,0.00012588501,-0.012016296,0.026275635,0.027023315,-0.012016296,-0.019882202,0.018447876,-0.014411926,-0.010871887,0.026672363,0.007675171,0.02720642,-0.03314209,0.01474762,0.0052490234,-0.0042762756,-0.01537323,-0.017181396,0.01259613,0.012580872,0.042266846,-0.017730713,-0.00844574,0.03213501,0.025405884,0.0070610046,0.04675293,0.00096416473,0.039367676,0.008773804,-0.019241333,-0.00894928,0.017242432,-0.010566711,-0.029296875,0.003583908,-0.058258057,-0.025848389,0.026123047,0.001832962,-0.009094238,-0.049682617,0.008110046,-0.006919861,-0.011940002,0.012031555,0.016845703,0.004016876,0.00081539154,-0.005378723,0.022567749,-0.02885437,-0.032440186,-0.000049591064,-0.0052452087,-0.03741455,-0.04248047,0.0074806213,0.014511108,-0.00409317,-0.021377563,-0.0010528564,-0.010734558,0.024414062,-0.010940552,-0.01159668,-0.005592346,0.027679443,0.0061950684,-0.00082445145,0.013496399,-0.02255249,-0.025375366,-0.013946533,0.031982422,-0.0118637085,0.027297974,-0.006958008,0.022705078,0.019851685,0.0061187744,-0.0021381378,0.005619049,-0.004501343,0.008361816,-0.035949707,-0.018295288,0.025360107,0.02217102,0.000521183,-0.020736694,0.03564453,-0.019805908,-0.0181427,0.032470703,0.022201538,0.010734558,-0.00047898293,0.009361267,0.0012807846,-0.018066406,0.0039596558,-0.035858154,-0.00009530783,-0.028869629,0.017120361,0.006919861,0.029907227,0.017303467,-0.005680084,-0.016220093,0.021514893,0.024765015,0.018051147,0.012649536,0.018859863,-0.016921997,-0.013885498,-0.023605347,0.010169983,0.013389587,0.0072517395,0.018249512,-0.0069007874,-0.0060157776,-0.011444092,0.031799316,0.03186035,0.00012874603,-0.03479004,-0.010559082,-0.047607422,0.041503906,-0.0010347366,0.013290405,-0.0019254684,0.031951904,0.0005631447,-0.051940918,-0.016647339,0.05505371,-0.0018138885,0.004676819,-0.031677246,0.013038635,0.02229309,-0.04562378,0.008056641,-0.044891357,-0.029022217,-0.0038909912,-0.012702942,0.022888184,0.0011901855,-0.014976501,-0.0043411255,-0.0056381226,0.025177002,0.03186035,0.012466431,-0.027648926,-0.009399414,0.015838623,0.02709961,-0.008384705,-0.023803711,0.0013151169,0.002840042,0.02027893,-0.025802612,0.015930176,-0.03366089,0.019805908,-0.0018520355,-0.020126343,0.005077362,0.005935669,0.013839722,-0.01171875,0.008102417,-0.005065918,0.017349243,0.050933838,-0.024459839,-0.035491943,-0.0036182404,-0.0035152435,-0.020614624,-0.024658203,-0.0062179565,0.011512756,-0.04586792,0.024276733,-0.020843506,-0.0073509216,0.017852783,-0.002544403,-0.03173828,-0.0014324188,0.03552246,0.018753052,-0.0019836426,-0.0088272095,-0.011680603,-0.034362793,-0.032043457,0.0018777847,-0.002149582,0.003200531,0.023422241,-0.002588272,0.043823242,-0.0061187744,0.02029419,0.018356323,0.005302429,0.036865234,0.026321411,0.051605225,0.021392822,-0.03062439,0.02281189,0.006969452,-0.04525757,0.02029419,-0.023712158,-0.015098572,-0.020401001,0.001531601,-0.0032787323,-0.0039367676,0.022384644,-0.0035438538,-0.013374329,0.02458191,-0.030273438,-0.026657104,-0.010269165,-0.0030097961,0.046905518,0.016586304,0.0034809113,-0.013328552,-0.0073127747,0.041259766,0.05810547,-0.019897461,-0.009231567,-0.018692017,0.029281616,-0.0077056885,0.010681152,0.002954483,-0.013412476,-0.009521484,-0.017303467,0.00066518784,0.014297485,-0.024963379,-0.0079574585,0.013153076,-0.013328552,-0.007637024,0.032196045,-0.01928711,-0.008300781,0.0037651062,-0.0026988983,0.009437561,0.025680542,-0.0032615662,0.00724411,0.016143799,-0.040039062,0.046173096,0.018997192,-0.0031471252,0.01574707,-0.0093307495,-0.01890564,-0.02999878,-0.017730713,-0.008369446],"createdAt":"2026-04-21T18:32:28.391Z","updatedAt":"2026-04-22T15:03:11.849Z","lastSeenAt":"2026-04-22T15:03:11.849Z","tsv":"'/api/v1/nfts/55/owner':129 '0.02':11,24,76,123 '000':67 '20':66 '55':36 '6':72 'ERC-721 owner' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'accept':47,187 'across':110 'address':213 'advertis':62 'ai/ml':113 'analyt':112 'api':80,109 'appear':130 'application/json':164 'attach':90 'avail':180 'base':9,22,57,68 'base-network' 'beyond':154 'bodi':150,191 'broader':106 'call':42 'caller':88,202 'challeng':61,157 'contain':208 'crawl':139,183 'data':4,17,111,199 'decim':73 'detail':144,172 'document':140,174 'endpoint':28,46,128,173 'equal':75 'exact':185 'exampl':177 'expect':204 'field':186 'finance/web3':115 'format':153 'header':95 'host':104 'infer':114 'inform':146 'infrastructur':117 'json':206 'key':81 'limit':83 'lookup':136 'lowpaymentfee.com':30 'maxamountrequir':64 'metadata':158 'micropay':7,20 'mime':161 'minimum':210 'network':58 'nft':2,15,35,134,217 'nft-ownership-lookup' 'no-api-key' 'on-chain ownership' 'openapi':169 'owner':33,198,212 'ownership':3,16,135 'pay':40 'pay-per-cal':39 'pay-per-call' 'payload':179 'payment':52,94,100 'per':12,25,41,77,124 'post':48,190 'price':120 'proof':101 'protocol':44 'provid':103,143 'queri':1,14 'rate':82 'request':13,26,49,78,125,149 'request/response':178 'requir':87 'respons':152,160,207 'return':31,197 'schema':145 'settl':51 'simpli':89 'spec':170 'specif':127 'specifi':216 'structur':194 'subscript':85 'suit':107 'though':137 'token holder query' 'type':162 'uniform':121 'unit':69 'unknown':201 'usdc':54,71 'usdc-settlement' 'util':118 'valid':98 'via':5,18,37 'x':93 'x-payment':92 'x402':6,19,43,60,99,156 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"d37a14af-7036-4427-97e9-a9f7b03544a9","listingId":"11e9cb05-e65f-40c8-b8dd-e676d2cd12df","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/55/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":"2026-04-21T18:32:28.391Z"}],"sources":[{"listingId":"11e9cb05-e65f-40c8-b8dd-e676d2cd12df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/55/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.391Z","lastSeenAt":"2026-04-22T15:03:11.849Z"}],"details":{"listingId":"11e9cb05-e65f-40c8-b8dd-e676d2cd12df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/55/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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/55/owner"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Verify current ownership of a specific NFT before initiating a trade or transfer","Build dashboards that display NFT holder information without running your own indexer","Agent-driven workflows that need to confirm NFT ownership as part of automated decision-making"],"bestFor":["Agents needing quick, keyless NFT ownership checks settled in USDC on Base","Developers prototyping NFT-aware applications without managing API credentials","Low-volume or sporadic queries where $0.02 per call is more economical than a subscription"],"notFor":["Bulk or high-throughput NFT indexing across thousands of tokens (no batch endpoint documented)","Querying NFTs beyond token ID 55 on this specific endpoint (path is hardcoded to NFT #55)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.818Z"},"updatedAt":"2026-04-22T15:03:11.849Z"}}