{"id":"3dfffcc1-ee9c-47e0-86b1-85bc241f8c3a","shortId":"NwLfU9","kind":"x402","title":"x402-gated backup data endpoint on Base, payable in USDC per request.","tagline":"x402-gated backup data endpoint on Base, payable in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a backup resource dated 2023-04 via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/backups/2023-04` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform emphasizes simplicity: no API keys, no rate limits, no commitments — just attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the backup data actually contains. The endpoint is live (returns a proper 402 challenge), but without further documentation it is unclear what payload to send or what data is returned.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","backup-data","json-response","post-method"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","x402 backup","lowpaymentfee API","USDC micropayment API","Base network API","pay-per-call backup"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","Purpose and contents of the 'backups/2023-04' resource are completely undocumented","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2023-04","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/backups/2023-04","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is effectively nonexistent — every docs/pricing/README page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the backup data contains. The listing is a stub with only the challenge metadata to work from.","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":"2026-04-19T15:30:13.571Z","embedding":[-0.039916992,0.00592041,0.04714966,0.0075416565,0.019882202,-0.016403198,-0.007671356,0.01876831,0.054840088,-0.08129883,0.033569336,-0.033966064,-0.046051025,-0.05545044,-0.027420044,0.02909851,-0.035888672,-0.017532349,-0.040222168,0.015068054,0.032043457,-0.028808594,-0.0035572052,0.029708862,0.013290405,-0.019607544,-0.014320374,0.0021457672,-0.0033454895,-0.04348755,0.012413025,-0.028030396,-0.015029907,-0.008491516,0.015930176,0.04095459,0.016296387,0.01953125,0.02029419,-0.0066719055,0.022155762,-0.06210327,0.013557434,0.005455017,-0.013313293,-0.022232056,0.013595581,-0.03463745,-0.004623413,-0.021224976,-0.0074882507,-0.007820129,-0.03253174,0.023773193,0.018447876,0.004306793,0.010910034,-0.0037193298,0.0049591064,0.038024902,-0.004573822,-0.05407715,-0.02670288,-0.030441284,0.002122879,0.03982544,0.004673004,0.055664062,-0.021057129,0.067993164,0.03768921,0.05935669,0.014671326,0.0022296906,-0.006969452,-0.0021476746,0.012863159,0.066223145,0.006385803,-0.030899048,-0.0060310364,0.006713867,-0.051757812,-0.006942749,-0.025497437,-0.03552246,-0.025894165,0.02947998,-0.0079193115,0.04989624,-0.04949951,0.007171631,-0.0054969788,-0.0056610107,-0.0079574585,-0.03237915,-0.030029297,0.0038547516,0.012504578,0.012298584,-0.006374359,-0.033569336,0.0132369995,-0.03253174,0.054992676,0.017166138,0.026107788,0.0023975372,0.0031833649,-0.013595581,-0.03503418,-0.00573349,-0.00026988983,-0.029174805,-0.002368927,-0.0004477501,-0.047821045,0.007926941,-0.0008940697,0.032928467,-0.046417236,0.05569458,0.016479492,-0.0041046143,0.028839111,-0.036315918,0.0017204285,0.0062026978,-0.042114258,0.0009384155,0.050567627,0.0103302,0.019515991,-0.03994751,0.0023078918,0.028457642,-0.045074463,-0.0093688965,-0.06210327,-0.0121536255,0.039123535,-0.032989502,0.020492554,0.02420044,-0.11138916,0.0050086975,-0.02760315,0.03503418,-0.024139404,0.004047394,0.010726929,0.019302368,-0.0029830933,-0.0110321045,-0.015731812,-0.025115967,-0.013214111,0.010383606,-0.000749588,0.026855469,-0.021987915,0.03704834,0.017532349,-0.021316528,0.03149414,0.039123535,-0.01828003,-0.08123779,-0.0803833,-0.035980225,-0.008430481,-0.005935669,-0.00894928,0.00011861324,0.011054993,-0.041900635,-0.029022217,0.022735596,0.015045166,-0.0635376,0.0059928894,-0.0597229,0.029251099,0.005367279,-0.0690918,-0.009536743,-0.032684326,0.050750732,0.012702942,0.023727417,0.019866943,0.0033130646,0.042236328,0.01586914,-0.027160645,-0.036834717,0.021072388,-0.035980225,0.06585693,0.009559631,0.015419006,-0.024154663,0.02243042,0.053100586,0.014549255,-0.0035476685,-0.014556885,-0.043945312,-0.07489014,-0.04498291,0.012290955,0.0074882507,-0.031097412,0.013496399,-0.025054932,-0.025558472,0.0072288513,0.020858765,0.0129776,0.05291748,0.012886047,-0.013557434,0.011138916,0.026550293,-0.015586853,0.039764404,0.03164673,0.0014419556,-0.0048294067,-0.030380249,0.00894165,0.01940918,-0.042144775,0.005268097,-0.010040283,0.02482605,0.0066833496,-0.024093628,0.019821167,0.0036621094,-0.013618469,-0.028884888,-0.030593872,-0.0026626587,0.008018494,-0.008995056,-0.044769287,-0.058654785,0.03201294,0.054473877,0.02420044,-0.014442444,-0.0016126633,-0.02243042,-0.014762878,-0.055389404,0.034362793,0.06323242,-0.015266418,-0.008575439,0.010803223,-0.002986908,-0.029418945,-0.013168335,-0.01234436,-0.0052223206,0.0008482933,0.000705719,-0.05117798,-0.0029087067,0.014572144,0.019866943,0.068481445,-0.015068054,-0.055908203,-0.0005712509,0.0035514832,-0.015533447,-0.018096924,0.01348114,0.016494751,0.017089844,0.020324707,0.003408432,0.03604126,0.029708862,0.02166748,0.0039901733,0.010101318,-0.0010700226,-0.052764893,0.013137817,0.014823914,-0.039855957,0.0345459,-0.0072021484,0.03152466,-0.029373169,0.035217285,-0.014877319,0.014709473,0.014709473,-0.034729004,-0.03753662,-0.014404297,-0.0039138794,0.013633728,0.05783081,0.0073623657,0.00554657,-0.041168213,0.049804688,-0.019470215,-0.016677856,-0.01411438,0.027694702,0.043701172,0.0055389404,-0.04751587,-0.055999756,-0.0047569275,-0.03881836,0.03793335,-0.02017212,0.00044751167,0.0012817383,-0.01676941,-0.015640259,-0.004737854,-0.010566711,-0.02255249,-0.022155762,0.016616821,-0.029296875,-0.0040779114,0.003288269,0.019241333,-0.011245728,0.013633728,-0.005630493,0.0047073364,0.008338928,-0.017913818,-0.028961182,-0.024047852,-0.018173218,0.013786316,0.03161621,0.002161026,0.03125,-0.05960083,-0.0007724762,0.008956909,-0.030181885,0.03930664,0.013038635,-0.017486572,-0.055603027,-0.035949707,-0.023895264,-0.031311035,0.03552246,0.023452759,-0.02255249,0.045318604,0.002708435,-0.030029297,-0.04034424,0.03744507,-0.034729004,-0.0028438568,0.024520874,-0.051452637,-0.015106201,-0.0043144226,-0.008178711,0.011703491,0.01576233,0.0151901245,0.021026611,0.068115234,0.027618408,0.0041770935,0.043304443,0.03643799,0.039520264,-0.02243042,-0.003955841,-0.01727295,-0.051330566,0.00920105,-0.011802673,-0.031677246,-0.06628418,0.044128418,0.039520264,0.0692749,0.0026988983,0.0051116943,0.025863647,-0.033325195,0.018615723,-0.062042236,-0.03503418,-0.016998291,-0.047454834,0.043945312,-0.008880615,-0.013938904,-0.0579834,0.018676758,0.022720337,0.007160187,-0.037475586,0.057373047,-0.0067977905,0.0004339218,0.04498291,-0.0063438416,0.05621338,0.06121826,-0.028213501,-0.002588272,0.008201599,-0.02909851,0.012527466,0.0129776,-0.006412506,-0.003627777,-0.053985596,-0.03112793,0.00061273575,-0.024307251,-0.029418945,-0.00082063675,0.016036987,0.041809082,0.006000519,-0.018035889,-0.0151901245,0.033294678,0.00039935112,-0.050933838,0.022949219,-0.03778076,0.0065841675,0.04043579,-0.007850647,0.004184723,-0.014778137,0.021224976,0.009918213,-0.015563965,0.0032444,0.009643555,-0.04626465,0.010513306,0.0042686462,0.018371582,0.018096924,0.047088623,0.025344849,0.046936035,0.026657104,0.029418945,-0.02645874,-0.036132812,0.024780273,-0.057281494,0.0018234253,0.014778137,-0.010269165,0.01512146,-0.0027503967,-0.021484375,-0.030380249,-0.020339966,-0.012245178,0.009529114,0.03164673,-0.03201294,-0.044158936,-0.06506348,-0.043182373,-0.0064048767,0.08465576,0.034576416,0.021026611,-0.026397705,-0.03829956,0.03286743,0.0053634644,0.018371582,-0.013771057,-0.023254395,-0.01222229,-0.024337769,-0.019058228,-0.0053253174,0.055847168,-0.0035896301,0.0022277832,0.0335083,0.018539429,0.03491211,-0.016662598,-0.0115356445,0.046875,-0.011230469,-0.001458168,-0.02041626,0.01927185,0.027008057,-0.033111572,-0.043762207,0.047454834,-0.0002450943,0.034362793,-0.042907715,-0.00012385845,-0.0002527237,0.021072388,0.012001038,-0.032226562,-0.0021476746,-0.0071907043,-0.050231934,-0.09301758,0.05731201,-0.0077285767,0.01979065,0.025909424,0.0009393692,0.019866943,-0.014305115,0.010414124,0.027191162,-0.024658203,-0.033935547,-0.020736694,-0.022888184,-0.008430481,-0.0013246536,-0.021133423,0.015808105,-0.010810852,0.025634766,-0.007736206,-0.012275696,0.03378296,0.01701355,-0.013366699,0.017578125,-0.008758545,0.01828003,0.02420044,-0.0069122314,-0.020339966,0.049804688,0.007369995,0.015991211,0.021102905,0.06060791,0.025283813,-0.01626587,-0.0055503845,-0.0013599396,-0.020843506,-0.024047852,-0.005306244,0.015045166,0.04019165,0.012451172,-0.03314209,0.0041046143,0.02053833,-0.03161621,-0.03466797,-0.0107421875,0.01625061,-0.03878784,0.013092041,0.000500679,0.057159424,-0.024993896,-0.006652832,0.008995056,0.03643799,0.021835327,0.0002951622,-0.01008606,0.010520935,-0.010421753,-0.0042877197,0.013214111,-0.00504303,0.011779785,-0.009635925,0.0072784424,0.011405945,-0.02027893,-0.025222778,-0.007083893,0.007659912,0.010520935,-0.005710602,0.02633667,0.011276245,0.021362305,-0.0031032562,0.033935547,0.028381348,-0.021362305,-0.009841919,0.011703491,0.043182373,-0.0060806274,0.0030937195,0.0140686035,0.011680603,0.04446411,-0.057739258,-0.00057411194,0.0043754578,0.019119263,-0.031585693,-0.05822754,-0.027313232,-0.026000977,0.03074646,-0.009918213,-0.011276245,0.03555298,0.013038635,0.00031280518,0.041503906,-0.00058984756,-0.0059051514,-0.01109314,-0.055908203,-0.0027675629,-0.003408432,-0.011909485,-0.030670166,0.007331848,-0.018981934,-0.039001465,0.022064209,-0.045959473,0.0031757355,-0.007774353,0.00014615059,0.050842285,-0.0021305084,0.021560669,-0.016235352,-0.013633728,0.014671326,0.0021743774,0.032287598,-0.044952393,0.0035705566,0.003921509,-0.004322052,-0.0049324036,0.02217102,0.016815186,0.026992798,0.021453857,0.030838013,-0.034210205,0.025878906,-0.0317688,-0.015151978,-0.023422241,-0.03314209,-0.0050811768,-0.016494751,-0.00066137314,0.035705566,-0.0184021,-0.0076522827,-0.033416748,-0.045196533,0.003162384,-0.0473938,0.0140686035,0.017837524,0.03878784,-0.016296387,-0.010147095,0.004272461,-0.001832962,-0.012298584,0.024215698,-0.001168251,0.04925537,0.018844604,0.011505127,-0.008369446,-0.02645874,-0.028457642,-0.0038719177,-0.039520264,-0.0473938,-0.024475098,-0.007293701,0.0033035278,-0.005569458,-0.04916382,-0.029754639,0.011421204,-0.052703857,0.010620117,0.002822876,0.021347046,0.0067100525,-0.0035533905,-0.018569946,0.00031614304,-0.030410767,0.029647827,-0.01739502,-0.05014038,-0.046569824,0.0026988983,0.029266357,0.009384155,-0.0022563934,-0.0491333,0.0035762787,-0.04156494,-0.06137085,0.016921997,-0.013725281,-0.00034713745,-0.013015747,-0.0025234222,-0.037628174,0.0055351257,-0.03488159,-0.016845703,0.009902954,0.0076141357,-0.00017428398,-0.010719299,0.013671875,-0.0028762817,-0.018463135,-0.034454346,0.01184845,0.009628296,0.0015296936,-0.0037345886,0.047790527,0.0008330345,-0.018447876,-0.0038394928,-0.013900757,0.020248413,-0.009552002,-0.008918762,-0.0047416687,0.019256592,-0.011856079,-0.031433105,-0.04650879,0.008262634,0.07434082,-0.007850647,-0.007987976,-0.005466461,-0.0236969,0.00868988,0.02772522,-0.036590576,0.0079422,-0.023468018,0.022262573,-0.025039673,0.019607544,0.013748169,0.02180481,0.0029201508,-0.042877197,0.009674072,0.01222229,0.025756836,-0.0859375,-0.04434204,-0.051239014,-0.026260376,-0.0021076202,-0.0030536652,0.0065307617,-0.0056495667,-0.036132812,-0.049194336,-0.014724731,0.062042236,-0.005558014,0.0021076202,-0.008895874,0.024246216,0.0146102905,-0.01184845,-0.041748047,0.0070266724,-0.027313232,-0.010231018,-0.028808594,0.040802002,0.0019950867,-0.007850647,0.024017334,0.008369446,0.0063934326,-0.029754639,0.02746582,-0.025512695,-0.010025024,0.008506775,-0.0033168793,-0.0017538071,0.008758545,0.022354126,-0.02507019,0.023330688,0.010307312,0.0073242188,0.005252838,0.018066406,0.03173828,-0.045959473,-0.00077056885,0.021499634,-0.001294136,0.0113220215,-0.03933716,0.056274414,-0.0013780594,0.0007381439,0.0052948,-0.01158905,-0.0025520325,-0.042999268,-0.0423584,0.0007405281,0.011650085,0.004802704,0.005710602,0.0023117065,0.005493164,0.016647339,-0.015960693,-0.016220093,-0.0004043579,-0.018936157,0.012123108,-0.0037517548,0.014701843,-0.008338928,0.03463745,0.050872803,0.04486084,0.011398315,-0.011550903,-0.009307861,0.032287598,-0.026657104,0.0010814667,0.015808105,0.025543213,0.011924744,0.008033752,0.017501831,-0.01889038,-0.002243042,-0.013519287,-0.005832672,0.014205933,-0.028060913,0.0008292198,0.0181427,0.011756897,-0.0023479462,-0.022644043,-0.009529114,-0.031921387,-0.017105103,-0.02861023,0.000647068,0.02746582,0.015602112,-0.026916504,0.012428284,-0.0065193176,0.031921387,-0.029296875,-0.0390625,0.032836914,0.043182373,-0.0054779053,-0.026885986,0.011375427,-0.0010251999,-0.03479004,0.008201599,-0.025115967,0.022583008,0.04196167,0.01776123,0.02520752,0.014053345,0.032073975,-0.0045547485,0.0029010773,0.0018167496,0.011367798,0.0004386902,0.01940918,-0.034332275,0.010818481,0.023254395,-0.012588501,-0.02949524,0.00016200542,-0.01663208,0.030975342,0.0014677048,0.0082473755,0.02998352,-0.01878357,0.016342163,-0.02508545,-0.0016155243,0.0051345825,-0.038330078,-0.032165527,0.007446289,-0.0047912598,-0.0022678375,0.018981934,-0.01058197,0.022003174,-0.026031494,0.02279663,0.0016975403,0.022842407,-0.037963867,-0.015304565,0.009429932,-0.0019550323,-0.0018806458,0.010520935,-0.004760742,0.02368164,0.036468506,0.005470276,0.007610321,0.012969971,0.021133423,-0.03010559,-0.009284973,0.013305664,-0.02670288,0.029937744,-0.04260254,0.050109863,0.055389404,0.012023926,0.042297363,0.030380249,0.026855469,-0.0047950745,0.028503418,-0.0181427,0.027450562,-0.011856079,0.023422241,0.0075149536,0.04348755,-0.008468628,0.00541687,0.017562866,0.02960205,-0.001871109,0.0418396,0.057739258,0.034423828,-0.016326904,0.032073975,-0.021514893,-0.035583496,-0.030059814,-0.010887146,0.04046631,-0.008804321,0.04434204,0.011512756,0.008255005,0.010887146,0.04840088,-0.008590698,-0.022003174,0.051361084,0.037963867,-0.0099487305,-0.012084961,0.0014247894,0.0012426376,-0.055541992,-0.023269653,0.032226562,0.007736206,0.004459381,-0.0038909912,0.0007362366,0.0012493134,0.0002696514,0.0049858093,0.0011577606,-0.03237915,0.013977051,0.0090408325,0.0031032562,0.02407837,-0.0049552917,0.021102905,-0.009231567,-0.011695862,-0.005493164,0.02468872,-0.00011217594,-0.019332886,0.0027275085,0.021408081,0.038238525,0.015548706,-0.014595032,0.010688782,0.021408081,0.0077056885,0.017974854,0.037322998,0.017913818,0.03479004,0.034301758,0.020751953,0.031829834,-0.024093628,0.007045746,-0.0012607574,0.008422852,-0.0015659332,-0.021560669,0.021347046,-0.002960205,0.01727295,-0.0049858093,-0.0015583038,0.029937744,0.034423828,-0.015281677,0.008003235,-0.003326416,-0.010902405,0.009552002,0.014953613,0.0066375732,-0.00491333,0.020736694,0.0040359497,0.02583313,-0.00844574,0.025924683,-0.006958008,-0.017166138,-0.008216858,0.023269653,-0.05807495,0.0028858185,0.03125,-0.011329651,-0.015533447,0.020523071,0.018341064,-0.026763916,0.014152527,-0.020004272,-0.0074501038,-0.0042304993,0.041137695,0.041015625,0.005695343,-0.013389587,-0.032409668,0.0020160675,0.04486084,0.003162384,-0.022201538,-0.029632568,-0.0051460266,0.0057373047,-0.0008916855,-0.0061569214,0.016784668,-0.018707275,0.009483337,0.025772095,0.052368164,0.0066719055,0.010375977,-0.0055351257,-0.0038146973,-0.009460449,0.01499176,0.019073486,-0.0021419525,-0.013267517,0.015716553,-0.023162842,0.029037476,0.03149414,0.002117157,0.013114929,0.0093688965,-0.016448975,0.0076408386,-0.033843994,0.010238647,-0.014572144,0.0041007996,-0.00340271,0.018371582,-0.016845703,-0.03265381,0.017120361,-0.027191162,-0.028381348,0.0030097961,0.020111084,0.012298584,0.0104522705,0.054229736,0.011512756,0.005104065,0.06323242,-0.0051193237,0.036193848,-0.03274536,-0.010536194,0.034118652,0.012039185,0.034057617,0.004550934,0.013313293,-0.034973145,0.01838684,0.01625061,0.021728516,0.019363403,0.011985779,-0.0060272217,0.041015625,-0.0033473969,0.0019407272,0.027038574,-0.0060157776,0.016921997,-0.026123047,-0.026657104,0.004081726,-0.0046195984,-0.011428833,0.05545044,-0.011734009,-0.02557373,-0.026550293,-0.025848389,0.019866943,0.001253128,-0.0046310425,0.0077171326,-0.013923645,0.015777588,-0.018478394,-0.019500732,0.0121154785,0.030899048,-0.064331055,-0.0014419556,0.009712219,0.016662598,-0.03314209,0.026229858,0.040863037,0.009857178,0.014167786,0.025558472,-0.01474762,0.031173706,-0.016418457,0.016799927,0.03729248,0.0046806335,-0.013671875,0.028411865,0.019042969,-0.012748718,-0.005191803,0.022613525,0.019226074,0.019836426,0.00035858154,-0.0022716522,-0.00064229965,0.011917114,-0.00674057,0.0013513565,-0.011703491,0.0067329407,0.012969971,0.014228821,0.013366699,0.013580322,-0.006778717,-0.02178955,0.015853882,0.04260254,0.021820068,-0.040863037,0.006401062,0.008766174,0.0020427704,-0.01158905,-0.02053833,0.021575928,-0.035369873,0.003364563,0.0234375,0.0035438538,0.000081300735,-0.017654419,-0.015487671,0.023254395,0.026382446,0.014228821,0.0064582825,-0.0032215118,0.0044288635,-0.0031356812,-0.0033187866,-0.016464233,-0.0074272156,0.008094788,0.04083252,-0.0143966675,-0.031921387,0.00756073,0.011123657,0.008430481,-0.017181396,0.023254395,0.011703491,0.0004553795,-0.00090932846,-0.008865356,0.02734375,-0.017547607,-0.03302002,-0.02947998,0.0206604,0.035583496,-0.0063285828,-0.027420044,0.00045347214,0.040222168,0.00818634,0.032592773,-0.004432678,0.054779053,0.008666992,-0.0038967133,-0.039154053,0.0056037903,-0.014442444,-0.028152466,0.019165039,-0.014953613,0.00087976456,-0.0028438568,0.018859863,-0.0056648254,-0.049041748,-0.022033691,-0.037353516,-0.025665283,0.038604736,-0.0015029907,0.024276733,-0.026931763,-0.007850647,0.041381836,-0.009513855,-0.047668457,-0.034729004,-0.0012273788,-0.018630981,-0.05859375,0.023590088,-0.00843811,0.005455017,-0.016815186,0.012817383,-0.009712219,0.0119018555,0.0018024445,-0.009223938,0.01763916,0.010620117,-0.012458801,0.00919342,0.01927185,-0.027755737,-0.016281128,-0.029342651,0.02468872,-0.015419006,0.02835083,0.0069122314,0.029220581,0.024673462,-0.03314209,0.009666443,-0.005493164,-0.009857178,-0.0074310303,-0.020431519,-0.011802673,0.024978638,0.026855469,-0.0061073303,-0.006000519,0.047851562,-0.02520752,-0.025421143,0.021530151,0.03036499,-0.0020427704,0.037628174,0.017242432,-0.007785797,-0.018157959,-0.010505676,-0.0030612946,0.01386261,0.0065307617,-0.021255493,-0.009780884,0.0015382767,-0.0044021606,-0.018814087,0.002243042,0.019943237,0.019073486,-0.0011854172,0.032073975,0.014823914,0.012840271,0.0019407272,-0.034820557,0.010803223,0.04748535,0.008392334,-0.0038204193,0.015571594,0.0011119843,-0.029785156,0.018600464,0.0049552917,-0.016616821,-0.036895752,-0.025726318,-0.036499023,0.00491333,-0.0058898926,0.01322937,-0.0070533752,0.02947998,-0.006511688,-0.030517578,0.0012187958,0.023483276,0.0012435913,-0.024887085,0.0072288513,-0.009712219,-0.004638672,-0.017333984,0.018051147,-0.05706787,-0.024047852,-0.028381348,-0.025543213,0.008506775,0.013114929,-0.022842407,-0.004814148,0.0010490417,-0.014625549,-0.0126571655,0.0256958,-0.008583069,-0.010948181,0.00749588,0.026306152,-0.002149582,0.010063171,-0.0317688,-0.00043988228,0.0074005127,-0.0066566467,0.026397705,0.0050354004,0.0121154785,-0.006866455,-0.03010559,0.02470398,-0.010345459,0.030090332,-0.0074501038,-0.006881714,-0.016204834,-0.017364502,0.011627197,0.0025177002,-0.022537231,0.0025310516,-0.007534027,-0.005458832,0.0059280396,0.00013411045,0.010826111,-0.0050201416,0.045532227,-0.024749756,0.0013313293,0.00025701523,-0.006526947,-0.025466919,0.005493164,0.0047721863,-0.015838623,-0.008155823,-0.005016327,-0.0041236877,-0.035186768,-0.011360168,0.011184692,-0.019607544,0.013694763,0.031311035,0.032409668,0.0317688,0.006843567,0.023162842,0.013420105,0.0048561096,0.027877808,0.007801056,0.047027588,-0.012641907,-0.0052261353,-0.0036144257,0.012680054,-0.014518738,-0.004360199,-0.0013685226,-0.01776123,-0.0597229,0.0023880005,-0.020202637,0.011528015,-0.0068244934,0.015167236,-0.025970459,0.0073127747,-0.030639648,0.0052375793,-0.04562378,0.020690918,0.01852417,0.00015938282,0.015205383,-0.015487671,-0.031829834,0.016433716,0.040863037,-0.018875122,-0.037261963,-0.011985779,0.004611969,-0.017791748,0.015945435,0.012458801,-0.022720337,0.0041923523,0.008956909,-0.015319824,-0.0206604,-0.009216309,0.01713562,0.015167236,-0.023269653,-0.030593872,0.028884888,0.028030396,-0.016525269,0.0035076141,-0.0037574768,0.025756836,0.027450562,-0.008125305,0.015960693,0.009033203,-0.03829956,0.04272461,0.0018310547,0.021453857,-0.02394104,-0.0029907227,-0.047668457,-0.0032749176,0.0107040405,-0.015991211],"createdAt":"2026-04-18T19:29:47.512Z","updatedAt":"2026-04-22T16:32:25.846Z","lastSeenAt":"2026-04-22T16:32:25.846Z","tsv":"'-04':39 '/api/v1/backups/2023-04':86 '0.02':112 '000':102 '0x8335':107 '20':101 '2023':38 '402':191 '6':117 'Base network API' 'USDC micropayment API' 'accept':87 'access':32 'actual':182 'advertis':96 'ai/ml':65 'analyt':64 'api':60,124,151 'attach':132 'backup':4,17,35,180 'backup API' 'backup-data' 'base':8,21,79,103,109 'behind':74 'broader':50 'challeng':95,192 'commit':130 'connect':159 'contain':183 'content':165 'cost':99 'data':5,18,63,68,181,206 'data backup endpoint' 'date':37 'decim':118 'descript':176 'doc':149 'document':144,196 'dozen':54 'emphas':121 'endpoint':6,19,28,61,85,185 'equal':111 'exampl':173 'extrem':146 'finance/web3':67 'gate':3,16,73 'header':137 'infer':66 'infrastructur':70 'json':92 'json-response' 'key':125 'limit':128 'live':187 'lowpaymentfee API' 'lowpaymentfee.com':30 'maximum':98 'micropay':76 'network':80 'offer':53 'openapi':169 'page':154 'part':47 'pay':57 'pay-per-call backup' 'pay-per-request':56 'payabl':9,22 'payload':201 'payment':43,136,142 'per':12,25,58,113 'platform':51,120 'post':88 'post-method' 'price':150 'prompt':161 'proof':143 'proper':190 'protocol':44 'provid':31 'rate':127 'readm':153 'render':156 'request':13,26,59,89,114 'request/response':172 'resourc':36 'return':91,188,208 'schema':170 'send':203 'simplic':122 'span':62 'spars':147 'specif':84 'substant':164 'unclear':199 'unit':104 'usdc':11,24,82,106,115 'usdc-base' 'use':81,116 'util':71 'valid':140 'via':40 'wallet':160 'without':194 'x':135 'x-payment':134 'x402':2,15,42,75,94,141 'x402 backup' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"b8f37115-3e1d-4002-84fa-1770b2f51aca","listingId":"3dfffcc1-ee9c-47e0-86b1-85bc241f8c3a","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/backups/2023-04","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:47.512Z"}],"sources":[{"listingId":"3dfffcc1-ee9c-47e0-86b1-85bc241f8c3a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2023-04","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:47.512Z","lastSeenAt":"2026-04-22T16:32:25.846Z"}],"details":{"listingId":"3dfffcc1-ee9c-47e0-86b1-85bc241f8c3a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2023-04 \\\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 a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-04"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-04"},{"claim":"Docs, pricing, API, and README pages all show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving archived backup data from April 2023 via micropayment","Programmatic access to backup snapshots without API key management","Agent-driven data retrieval with on-chain USDC payment on Base"],"bestFor":["Developers wanting keyless, pay-per-request access to backup data","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing detailed documentation or request/response schemas before integrating","Users without a Base-compatible USDC wallet","High-volume bulk data retrieval where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.273Z"},"updatedAt":"2026-04-22T16:32:25.846Z"}}