{"id":"6a61ed58-9e61-4b47-8570-6c6ee72a6c8b","shortId":"FJKbVF","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace offering a broad set of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The platform uses the x402 payment protocol: callers receive a 402 challenge containing payment details, settle in USDC on-chain, and then receive the API response.\n\nThe specific endpoint at `/api/v1/apikeys/99` is listed as \"Premium API Access.\" Its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages (docs, pricing, README) were largely empty during crawl, returning only a \"Connect wallet\" prompt, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","402 payment API"],"warnings":["Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no actual content during crawl.","No OpenAPI or request/response schema is available for any endpoint.","The specific purpose of /api/v1/apikeys/99 ('Premium API Access') is unclear — it may be a meta-endpoint for generating API keys rather than a data endpoint.","The broader platform lists many endpoints but none were individually probed for liveness beyond this one."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/99","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/apikeys/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are effectively empty, there is no OpenAPI schema, no request/response examples, and the purpose of the specific /api/v1/apikeys/99 endpoint (vs. the many other listed endpoints) is unclear. The listing is functional but sparse.","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":"2026-04-19T15:17:15.433Z","embedding":[-0.01373291,-0.04156494,0.04232788,0.021820068,0.02003479,-0.028213501,-0.020767212,0.054107666,0.062194824,-0.05847168,0.020629883,-0.042877197,-0.026107788,-0.031707764,-0.0259552,0.009780884,-0.004322052,-0.004009247,-0.053619385,0.03677368,0.031341553,-0.0088272095,-0.008277893,0.03491211,0.012054443,-0.02720642,0.00566864,-0.01927185,-0.014587402,-0.044433594,0.028335571,-0.023254395,-0.009849548,0.03817749,-0.013870239,-0.020721436,-0.003932953,0.030197144,0.030822754,-0.020065308,-0.011054993,-0.059570312,0.011894226,0.016159058,-0.060302734,-0.009674072,0.011070251,-0.029464722,-0.008361816,0.0050354004,-0.032073975,-0.0041160583,-0.028076172,-0.008110046,0.006954193,0.015808105,-0.016983032,-0.019165039,0.013008118,0.0027999878,0.01084137,-0.046447754,-0.01209259,0.006664276,0.00029325485,0.04473877,-0.0033683777,0.04574585,0.01008606,0.05609131,0.045684814,0.055877686,0.032470703,0.008110046,0.009437561,-0.0024261475,-0.019638062,0.075927734,-0.009231567,-0.010757446,-0.0026550293,-0.0077285767,-0.04385376,0.0009551048,-0.022216797,-0.06488037,-0.006061554,0.021850586,-0.014152527,0.036468506,-0.068237305,-0.010635376,-0.025863647,0.004573822,0.01576233,0.004470825,-0.021560669,0.011787415,-0.017349243,0.022079468,-0.0017690659,-0.040374756,-0.00031137466,0.028182983,0.04748535,0.041870117,0.012702942,0.025482178,-0.0026168823,-0.004722595,-0.01725769,0.023132324,-0.021560669,-0.023452759,0.020080566,0.011375427,-0.027175903,0.020950317,-0.035949707,0.013168335,-0.061340332,0.04071045,0.023132324,-0.013786316,0.017456055,-0.04626465,-0.01940918,0.013160706,-0.03567505,-0.012550354,0.020126343,0.018203735,0.0463562,-0.019210815,-0.023483276,-0.0005393028,0.0028362274,-0.016799927,-0.045318604,-0.035949707,0.036956787,-0.026428223,0.030548096,0.04034424,-0.08868408,-0.01928711,-0.06414795,0.007282257,-0.025009155,-0.012237549,0.0035514832,0.013908386,-0.031677246,-0.014022827,-0.0076026917,-0.030014038,-0.016342163,0.040527344,-0.00007337332,0.026428223,-0.01864624,0.055725098,0.004837036,0.002937317,0.034423828,0.042175293,-0.019973755,-0.084472656,-0.09283447,-0.053985596,-0.015411377,-0.024307251,-0.02482605,-0.0051651,-0.0039405823,-0.09301758,-0.026062012,-0.0063285828,-0.0067825317,-0.03152466,-0.02041626,-0.03225708,0.0082473755,-0.011077881,-0.03451538,-0.010612488,-0.02998352,0.061035156,0.018600464,0.0076408386,0.034729004,-0.014152527,0.05239868,0.010925293,-0.005218506,-0.029785156,0.009521484,-0.02067566,0.018661499,0.009140015,0.0038013458,-0.021972656,0.035369873,0.06726074,0.010688782,-0.015335083,0.0010023117,-0.045440674,-0.035736084,-0.02305603,0.010002136,0.018692017,-0.006259918,0.036315918,-0.046417236,-0.029541016,-0.01638794,0.0057640076,0.011436462,0.06628418,-0.0014925003,-0.012840271,0.029724121,0.020248413,-0.051452637,0.038330078,0.042663574,0.016342163,-0.022872925,-0.017303467,0.02381897,0.030807495,-0.03881836,0.011886597,-0.030014038,0.025466919,0.0009803772,0.00030636787,0.02229309,-0.013946533,-0.025024414,-0.028839111,0.002571106,0.0546875,0.0042800903,-0.011169434,-0.044799805,-0.06982422,0.037719727,0.031341553,0.04159546,-0.017089844,0.0055618286,-0.014694214,0.009490967,-0.064575195,0.065979004,0.09136963,-0.008590698,-0.009803772,0.01322937,-0.007549286,-0.036743164,-0.010826111,0.009399414,-0.022567749,-0.025054932,0.03555298,-0.026519775,-0.0075187683,0.01423645,0.014602661,0.05102539,-0.015823364,-0.028961182,-0.031982422,-0.0040626526,0.0060195923,-0.049316406,0.0001680851,0.0107040405,0.011810303,0.054748535,-0.008628845,0.02949524,-0.0074386597,0.022506714,-0.0064811707,-0.012672424,-0.043823242,-0.014533997,0.01335907,0.009666443,-0.0657959,0.03062439,-0.011199951,0.056030273,-0.037078857,0.030700684,-0.011459351,0.026916504,0.03656006,-0.0074005127,-0.04763794,0.0042152405,0.04071045,0.022125244,0.030960083,0.008911133,-0.01864624,0.0087509155,0.061645508,-0.02067566,-0.005065918,0.0103302,0.0062675476,0.026000977,-0.0035877228,-0.049591064,-0.028961182,-0.007419586,-0.039001465,0.023101807,-0.044830322,0.04257202,-0.012802124,-0.0010519028,-0.031463623,0.009811401,-0.046447754,0.035186768,-0.005405426,0.00944519,-0.012519836,-0.033355713,0.006134033,0.034851074,-0.04360962,-0.010124207,0.04272461,0.016815186,-0.025009155,-0.03640747,-0.026351929,-0.0014619827,-0.021911621,0.019760132,0.026550293,0.01121521,0.044647217,-0.034606934,0.008163452,0.01612854,0.0009469986,0.050323486,-0.007858276,0.01171875,-0.0546875,-0.044006348,-0.028076172,-0.040405273,0.021148682,0.022872925,-0.0012435913,0.042388916,0.0022735596,-0.023284912,-0.03515625,0.00365448,-0.0546875,-0.008583069,0.034118652,-0.001789093,-0.03265381,-0.010498047,0.014694214,0.005935669,0.039215088,0.0096588135,0.004295349,0.073913574,0.047424316,0.0053634644,0.022338867,0.0025024414,0.01890564,0.008148193,-0.01625061,-0.038146973,0.01600647,0.018615723,-0.022583008,-0.008338928,-0.05935669,0.05960083,0.04815674,0.06695557,0.024673462,0.014442444,0.041625977,-0.0309906,-0.0036773682,-0.009635925,-0.019134521,-0.020828247,-0.03375244,0.026779175,-0.0069389343,-0.011108398,-0.014152527,0.04196167,-0.0017528534,0.010879517,-0.03289795,0.051330566,-0.00048208237,-0.014312744,0.017044067,0.01398468,0.04574585,0.03564453,-0.046783447,0.016433716,0.009902954,-0.037139893,-0.013587952,0.042266846,-0.0012025833,-0.018173218,-0.060394287,-0.0395813,-0.008239746,-0.012916565,-0.046142578,-0.007686615,-0.000096440315,0.020568848,0.03366089,-0.025680542,-0.019622803,-0.011016846,-0.02192688,-0.055511475,-0.011909485,-0.0579834,-0.009811401,0.025497437,-0.03665161,-0.012687683,0.0076408386,0.005458832,-0.026641846,0.014419556,0.007850647,-0.0024375916,-0.0602417,0.0385437,0.0078125,0.010261536,0.019638062,0.03414917,0.04321289,0.0104522705,0.05419922,0.011352539,-0.020263672,-0.040222168,0.012519836,-0.0491333,0.003408432,0.00831604,-0.0134887695,-0.019882202,-0.014038086,-0.020141602,-0.034362793,0.025299072,-0.03643799,0.022003174,0.02659607,-0.04373169,-0.019485474,-0.08392334,-0.019714355,-0.02720642,0.057159424,0.014945984,-0.0039596558,-0.04537964,-0.021026611,0.017181396,-0.0026130676,0.02357483,-0.014839172,-0.005504608,0.009689331,-0.02557373,-0.009712219,-0.032470703,0.02684021,0.0023174286,-0.0055885315,0.013366699,0.021636963,0.0027065277,-0.0017910004,0.012367249,0.024505615,-0.0149002075,-0.0018386841,-0.01625061,0.008728027,-0.00063323975,0.010292053,-0.034210205,0.049713135,0.013618469,0.041992188,-0.030822754,0.0027217865,0.0038604736,0.0206604,0.034362793,-0.00957489,-0.0073013306,-0.0079574585,-0.048919678,-0.07965088,0.034698486,-0.037384033,0.028411865,0.00970459,0.008850098,0.028625488,-0.02180481,0.005908966,0.030166626,-0.028335571,-0.010231018,-0.018310547,-0.025039673,-0.0044288635,0.008003235,-0.031677246,0.016677856,-0.014289856,-0.005874634,-0.0087509155,-0.027740479,0.020736694,0.015129089,-0.007637024,0.020385742,0.0039596558,0.03378296,0.04800415,0.0047035217,-0.02684021,0.020111084,-0.006023407,-0.002538681,-0.007045746,0.04574585,0.029724121,-0.030334473,-0.017242432,0.008575439,-0.008666992,-0.025497437,-0.004917145,0.008804321,0.010169983,0.0049552917,-0.033416748,0.0025749207,0.016830444,-0.030563354,-0.010101318,0.0154953,0.01789856,-0.031402588,0.043151855,0.03463745,0.0592041,-0.01197052,0.010620117,0.001540184,0.041625977,0.034179688,0.010520935,-0.026977539,0.006954193,-0.003068924,0.021850586,-0.005924225,0.0008921623,0.0236969,0.00365448,0.004173279,0.026733398,0.018478394,-0.03201294,-0.039855957,0.010192871,-0.0052986145,-0.014511108,0.024276733,0.02230835,0.009506226,-0.017166138,0.027374268,0.016830444,-0.025802612,-0.01600647,-0.021865845,0.049865723,-0.0040359497,-0.014434814,0.019439697,-0.002878189,0.0079956055,-0.049835205,-0.0058555603,0.009384155,0.022247314,-0.03353882,-0.04815674,-0.035491943,0.0033683777,0.02217102,0.017913818,0.034179688,0.024047852,-0.0027332306,-0.0055503845,0.031036377,0.0034046173,0.00012457371,-0.00932312,-0.050231934,-0.0067367554,-0.009918213,-0.0010728836,-0.024749756,0.012863159,-0.015586853,-0.023895264,-0.00027394295,-0.0019931793,-0.014694214,-0.016403198,0.008010864,0.02909851,0.011505127,0.014602661,-0.02571106,-0.012466431,0.0056266785,0.006454468,0.0012483597,-0.037841797,0.02104187,-0.014389038,-0.009399414,-0.006374359,0.021499634,0.028045654,0.021377563,0.003194809,0.036376953,-0.035827637,0.03967285,-0.044067383,0.023590088,-0.0055236816,-0.032196045,-0.0048332214,-0.024368286,-0.0075912476,0.03491211,-0.018661499,0.0014600754,-0.025924683,-0.028808594,-0.0049591064,-0.048187256,0.015098572,0.032928467,0.043426514,-0.036590576,-0.0022354126,0.004524231,0.010009766,-0.020111084,0.015838623,-0.0043563843,0.023651123,0.018478394,0.0069122314,-0.027786255,-0.02243042,-0.0052375793,-0.009666443,-0.042114258,-0.048095703,-0.017425537,0.013000488,-0.00059223175,0.003900528,-0.02508545,-0.03213501,-0.00013005733,-0.027679443,0.009925842,-0.007083893,0.010177612,0.014167786,-0.011177063,0.004016876,0.026397705,-0.02557373,0.032592773,0.00730896,-0.0026493073,-0.04458618,-0.00422287,0.036834717,0.0231781,-0.0028305054,-0.024673462,-0.014472961,-0.018951416,-0.05267334,-0.014930725,-0.00035595894,0.014801025,0.003019333,0.00472641,-0.056732178,-0.010574341,-0.030883789,-0.0030345917,0.03048706,0.024795532,0.008605957,-0.00076818466,0.013961792,-0.008590698,-0.0029754639,-0.032287598,-0.0009675026,0.0107803345,0.009124756,0.021270752,0.049713135,0.0040779114,-0.01940918,0.011016846,-0.0015201569,0.019500732,-0.013435364,0.010009766,-0.034454346,0.015037537,0.00484848,-0.01939392,-0.03668213,-0.008163452,0.08178711,0.00045967102,-0.009544373,0.0073661804,-0.012931824,0.017547607,0.037078857,-0.05923462,-0.009788513,-0.03289795,0.008972168,-0.011199951,0.013542175,-0.0023994446,0.011039734,-0.013801575,-0.06341553,-0.012435913,0.0043945312,-0.011962891,-0.05126953,-0.022216797,-0.04260254,-0.008049011,-0.00945282,-0.022094727,-0.0051116943,0.008560181,-0.015083313,-0.07775879,0.012039185,0.052978516,0.00737381,0.032684326,-0.01600647,0.0027313232,0.030807495,-0.028625488,-0.015083313,0.026031494,-0.03387451,-0.033599854,-0.03475952,0.02468872,-0.013511658,-0.015808105,0.030929565,0.010246277,0.026611328,-0.009651184,0.020553589,-0.006298065,0.022262573,-0.00894928,0.013473511,-0.008811951,0.011528015,0.019897461,-0.043884277,0.016998291,0.01423645,-0.002576828,0.0027256012,0.0234375,0.042755127,-0.042907715,-0.011909485,0.01739502,0.0037975311,0.040161133,-0.021438599,0.049865723,0.009963989,-0.01828003,0.022521973,-0.0077209473,-0.028213501,-0.035369873,-0.031219482,0.023773193,0.015022278,0.025772095,-0.008087158,0.00390625,0.026535034,-0.0050239563,0.006374359,-0.018798828,-0.013076782,-0.020141602,0.0030441284,0.0005455017,-0.0057373047,0.0017528534,0.02986145,0.021392822,0.038146973,0.009887695,-0.008300781,0.005191803,0.023269653,-0.011108398,-0.0026397705,0.017913818,0.007801056,0.006843567,0.012275696,0.013931274,-0.054534912,-0.0138549805,-0.036193848,-0.010253906,0.0003476143,-0.012969971,-0.009117126,-0.0074768066,0.0036468506,-0.00283432,-0.035186768,0.019332886,-0.048553467,-0.026382446,0.004058838,-0.011520386,0.020904541,0.014205933,0.0039405823,0.011413574,-0.0012750626,0.066101074,0.008132935,0.003929138,0.034210205,0.037597656,0.020568848,-0.03161621,-0.010856628,0.00082063675,0.0037555695,0.007621765,-0.03778076,0.021194458,0.04373169,-0.027923584,0.017715454,-0.0015001297,0.0101623535,-0.020492554,-0.00049829483,-0.010627747,0.017028809,-0.016616821,0.02949524,-0.04296875,0.0009226799,0.0042915344,0.004711151,-0.0012264252,-0.028961182,-0.018035889,0.00919342,-0.005718231,-0.017349243,0.04019165,0.008010864,0.036010742,-0.021560669,-0.018722534,0.013824463,-0.031311035,-0.026977539,0.042388916,-0.018707275,-0.0096588135,0.016357422,-0.028411865,0.041046143,-0.034057617,0.01184845,0.0184021,-0.011497498,-0.012145996,0.0000860095,-0.021362305,-0.00010043383,-0.0031375885,-0.013305664,-0.0026245117,0.046325684,0.022598267,0.03201294,0.04626465,0.01777649,0.0075950623,-0.04257202,-0.02671814,0.0031833649,-0.024368286,0.013267517,0.00014185905,0.043029785,0.032318115,-0.002128601,0.022613525,0.034362793,0.021087646,-0.0006046295,0.011398315,-0.02848816,0.018600464,-0.017593384,0.033569336,0.005584717,0.042114258,-0.039764404,0.00082826614,0.005039215,0.0012769699,-0.023361206,0.039764404,0.068115234,0.019958496,-0.0022506714,0.029067993,-0.0053596497,-0.012359619,-0.012275696,-0.016799927,0.0574646,0.022216797,0.05117798,0.0463562,0.0071372986,-0.000344038,0.022567749,-0.029388428,-0.03111267,0.0670166,0.028778076,-0.034118652,-0.020187378,-0.005874634,0.0030498505,-0.041015625,-0.030822754,0.018371582,-0.0009851456,-0.005645752,-0.012565613,-0.0070724487,-0.008491516,0.015350342,0.025497437,0.00699234,-0.007873535,0.029907227,0.023162842,0.0071754456,0.020477295,-0.0017547607,0.035003662,-0.02961731,-0.017181396,0.010528564,0.026290894,-0.0054740906,-0.0029640198,0.015548706,0.004940033,0.0385437,0.035980225,-0.02734375,0.0037593842,0.019317627,0.01878357,0.014289856,0.051513672,0.030166626,0.012077332,0.033416748,0.038360596,0.024932861,-0.029052734,0.004699707,-0.0049858093,0.00046610832,-0.010910034,-0.012901306,-0.0022506714,-0.010971069,0.013931274,-0.0007157326,-0.0017566681,0.022979736,0.016433716,-0.010734558,-0.0015268326,-0.016021729,0.011459351,-0.021087646,0.0040283203,0.024017334,-0.016448975,0.037506104,0.014694214,0.021942139,-0.036071777,0.016540527,-0.0030784607,-0.025970459,-0.005882263,0.022354126,-0.049591064,-0.004425049,-0.011459351,-0.002357483,-0.04244995,0.013511658,0.032043457,-0.021942139,0.033355713,0.01159668,-0.011314392,-0.010055542,0.023040771,0.0027389526,-0.008682251,-0.0077934265,-0.036254883,0.021713257,0.040130615,0.00440979,0.023895264,-0.020965576,-0.006088257,-0.002910614,-0.013290405,0.009407043,-0.001958847,-0.024963379,-0.025497437,0.018295288,0.03677368,0.019317627,0.024475098,-0.008674622,-0.016647339,0.012893677,0.027572632,0.013450623,0.010894775,-0.004764557,0.04550171,-0.0084991455,0.038635254,0.041290283,-0.0037879944,0.026916504,-0.008842468,-0.008018494,0.005203247,-0.015113831,0.029785156,-0.018447876,0.013320923,-0.008560181,0.031402588,-0.006252289,-0.026794434,0.0042648315,-0.014732361,-0.0084991455,-0.021224976,0.0135269165,-0.0042381287,0.026062012,0.048553467,0.01940918,-0.034088135,0.060333252,-0.015991211,0.045776367,-0.013404846,-0.007381439,0.048797607,0.031036377,0.04095459,0.012054443,0.009925842,-0.021072388,0.010536194,0.04547119,0.024246216,0.001991272,0.014717102,-0.01007843,0.036590576,0.005138397,0.034729004,-0.006000519,-0.010116577,-0.006061554,-0.0063171387,-0.009529114,0.0046958923,-0.0071029663,0.005344391,0.049865723,-0.028289795,-0.0037612915,-0.02961731,-0.011360168,0.030334473,-0.0055236816,0.0070533752,-0.01828003,-0.028396606,0.01335144,-0.022216797,0.0022125244,0.015808105,0.029708862,-0.055419922,-0.023529053,0.014930725,0.029205322,-0.03668213,0.020996094,0.029144287,-0.0068893433,0.0074920654,0.04574585,-0.0057754517,0.03616333,-0.0009851456,0.026245117,0.042785645,0.008117676,-0.0107803345,0.008285522,0.011550903,-0.013870239,0.01008606,0.028182983,-0.012916565,-0.0016050339,-0.002117157,-0.0069084167,0.0012254715,0.018356323,-0.0061454773,0.0049934387,-0.008163452,-0.00356102,-0.003364563,0.011024475,0.00774765,0.011947632,-0.009460449,-0.008346558,0.022338867,0.028182983,0.018875122,-0.02909851,-0.0054130554,0.010971069,0.011299133,-0.01335907,-0.021713257,-0.017608643,-0.033599854,0.014053345,0.018218994,0.008575439,0.0013532639,-0.019760132,0.0015525818,0.022583008,0.0066184998,-0.004875183,-0.004272461,-0.016830444,0.0022525787,-0.0138549805,-0.0059394836,-0.017868042,0.00014138222,0.019317627,0.027557373,-0.014183044,-0.027450562,0.027374268,0.0058288574,0.010269165,-0.013671875,-0.008003235,0.02520752,-0.014984131,-0.013801575,0.004760742,0.024139404,-0.0066223145,-0.0051078796,-0.017456055,0.02760315,0.052215576,-0.01524353,-0.015670776,0.022003174,0.012329102,0.023376465,0.03491211,0.009086609,0.034240723,0.027389526,-0.011672974,-0.019317627,0.017303467,-0.0155181885,-0.03012085,0.016601562,0.0035820007,-0.012107849,0.022659302,0.001033783,-0.0158844,-0.02796936,-0.018737793,-0.0069732666,-0.015258789,0.020721436,-0.01007843,0.020309448,-0.019607544,-0.0025672913,0.007858276,-0.008293152,-0.040496826,-0.0041923523,0.0023288727,-0.016326904,-0.04638672,-0.005153656,-0.02633667,0.009613037,-0.019592285,-0.014076233,0.0018281937,0.028396606,-0.019973755,0.0002655983,-0.005393982,0.02746582,0.021270752,-0.0013113022,0.022109985,-0.018478394,-0.030456543,-0.027832031,0.011116028,-0.023529053,0.014862061,0.0022258759,0.051239014,0.010284424,-0.0096206665,-0.0035095215,-0.009437561,-0.00349617,-0.021972656,-0.017791748,-0.033416748,0.017333984,0.021469116,0.0036334991,-0.0074272156,0.04525757,-0.021560669,-0.013114929,0.012794495,0.042236328,-0.002784729,0.026763916,-0.012290955,0.0025367737,-0.010299683,-0.002986908,-0.018508911,0.0038967133,0.018600464,0.00033259392,-0.0020427704,-0.011039734,0.030075073,-0.025390625,-0.011795044,0.027420044,-0.0011053085,-0.02255249,0.030807495,0.019607544,-0.0007185936,-0.015022278,-0.014129639,0.009239197,0.039154053,0.017059326,0.0061836243,0.0061073303,0.011054993,-0.017822266,0.007167816,0.011482239,-0.02468872,-0.03564453,-0.031066895,-0.0491333,0.028579712,0.013725281,0.019546509,-0.005706787,0.023986816,-0.015670776,-0.032043457,-0.0099487305,0.028549194,0.018615723,-0.019073486,-0.008987427,0.005367279,0.013214111,-0.024398804,-0.0011768341,-0.03591919,-0.0335083,-0.018234253,-0.01360321,0.024291992,0.010559082,-0.004650116,0.007835388,0.0049057007,0.013183594,0.0017957687,0.027862549,-0.0112838745,0.004383087,0.015930176,0.0063705444,-0.022537231,0.014953613,-0.00013256073,-0.007583618,0.017028809,-0.01424408,0.017700195,-0.02029419,0.026153564,-0.006324768,-0.0016975403,0.028259277,0.0015687943,0.0035820007,-0.027282715,-0.007411957,0.01626587,0.005558014,0.037109375,-0.014801025,-0.0231781,0.011070251,-0.025543213,-0.036743164,0.0051345825,0.020263672,0.034942627,-0.013496399,0.03302002,-0.009971619,-0.002696991,0.017333984,0.0024909973,-0.015151978,-0.0025978088,0.046875,-0.00093984604,0.002090454,0.0028247833,0.0031986237,-0.030197144,-0.008384705,0.007282257,-0.004257202,-0.021606445,0.028869629,0.0067253113,0.04232788,-0.0005054474,0.019317627,0.011909485,0.0061912537,0.028289795,0.0105896,0.0317688,-0.0060043335,-0.024475098,0.0046920776,0.013168335,-0.014587402,0.0104522705,0.00258255,0.00957489,-0.039215088,0.011985779,-0.003917694,0.031585693,-0.021118164,0.013450623,-0.028869629,-0.017150879,-0.023803711,-0.0038108826,-0.040222168,0.01007843,0.039245605,0.014549255,0.022964478,0.0022411346,-0.029891968,0.032684326,0.057769775,0.0051345825,-0.032470703,-0.021743774,0.012031555,-0.0055503845,-0.022506714,0.020355225,-0.021942139,-0.018096924,-0.0008840561,-0.016647339,0.014678955,0.0014362335,0.008758545,0.008583069,-0.01637268,-0.0052871704,0.021636963,-0.0017681122,-0.0017910004,0.007926941,-0.0042648315,0.033203125,0.024765015,-0.012580872,0.021865845,0.025161743,-0.03488159,0.05505371,-0.013916016,0.013725281,-0.015129089,0.012794495,-0.04107666,-0.0236969,-0.0015821457,0.006954193],"createdAt":"2026-04-18T19:29:37.381Z","updatedAt":"2026-04-22T05:31:52.063Z","lastSeenAt":"2026-04-22T05:31:52.063Z","tsv":"'/api/v1/apikeys/99':107 '0.02':9,22,55,132,188 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x8335':127 '20':121 '300':147 '402':86,115 '402 payment API' '6':136 'Base network API' 'USDC API' 'accept':152 'access':3,16,113 'across':41 'addit':162 'address':143 'advertis':117,161 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':44 'analysi':166 'analyt':43 'api':2,15,33,67,101,112 'application/json':157 'base':8,21,63,123,129 'broad':37 'broader':159 'caller':83 'chain':96 'challeng':87,116 'classif':169 'commit':75 'connect':204 'contain':88 'convers':181 'conversion' 'crawl':200 'crypto-gas-estimates' 'data':42 'data-analytics' 'decim':137 'detail':90,208 'doc':193 'document':191 'embed':170 'empti':198 'enabl':32 'endpoint':40,51,105,151,163 'equal':131 'estim':178 'everi':50 'exchang':173 'exchange-rates' 'feed':172 'finance-price-feeds' 'finance/web3':46 'gas':177 'generat':183 'geocod':179 'geocoding' 'given':133 'includ':164 'infer':45 'infrastructur':48 'key':68 'larg':197 'limit':71 'list':109 'low payment fee' 'lowpaymentfee.com':27 'marketplac':34 'maxamountrequir':119 'micropay':6,19 'micropayment API' 'network':64 'offer':35 'on-chain':94 'page':192 'paid':58 'pay-per-call API' 'payment':81,89,139 'per':10,23,56 'per-request-micropayment' 'platform':77,160 'point':190 'post':153 'premium':1,14,111 'price':53,171,189,194 'prompt':206 'protocol':82 'quot':176 'rate':70,174 'readm':195 'receiv':84,99 'request':11,24,57,154 'request/response':209 'respons':102 'return':156,201 'schema':210 'second':148 'sent':141 'sentiment':165 'set':38 'settl':91 'specif':104 'summar':168 'text':167 'timeout':149 'token':175 'unavail':212 'unit':124 'upfront':74 'usdc':13,26,60,93,126,134 'usdc-base' 'use':78 'util':49 'valid':180 'validation' 'via':4,17 'wallet':205 'x402':5,18,31,80 'x402 API' 'x402-enabled':30 'x402-payment'","prices":[{"id":"47170f2a-a0ef-4d25-a41c-bca6e225057b","listingId":"6a61ed58-9e61-4b47-8570-6c6ee72a6c8b","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/apikeys/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:37.381Z"}],"sources":[{"listingId":"6a61ed58-9e61-4b47-8570-6c6ee72a6c8b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:37.381Z","lastSeenAt":"2026-04-22T05:31:52.063Z"}],"details":{"listingId":"6a61ed58-9e61-4b47-8570-6c6ee72a6c8b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/99 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/99"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, 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/apikeys/99"}],"useCases":["Agent-driven API consumption with per-call USDC micropayments on Base","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time crypto price feeds, gas estimates, and exchange rates on demand","Geocoding, data validation, and utility conversions via pay-per-use endpoints"],"bestFor":["Developers and AI agents wanting zero-signup, pay-per-request API access","Web3-native applications that can settle USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed OpenAPI schemas and request/response contracts upfront"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.769Z"},"updatedAt":"2026-04-22T05:31:52.063Z"}}