{"id":"c225ed5f-44d0-4bea-bdf5-d8db38d35c24","shortId":"pC5K4N","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/308` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or subscriptions are required — each request is individually settled on-chain.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, documentation for this specific endpoint (`/api/v1/transactions/308`) is essentially absent. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular transactions endpoint provides. The endpoint is live and responds with a valid x402 challenge, but what it actually returns after payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","transactions API"],"warnings":["No documentation available — all doc/API/pricing/README pages returned only 'Connect wallet' with no content.","No OpenAPI or output schema describing what this endpoint returns after payment.","The purpose of /api/v1/transactions/308 is unknown — 'Premium API Access' is the only description provided.","Cannot verify what data or functionality is delivered after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/308","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/transactions/308","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the /api/v1/transactions/308 endpoint actually returns. The crawled pages beyond the homepage were empty (wallet-connect only). This is effectively a stub listing.","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":"2026-04-19T13:04:31.599Z","embedding":[-0.029449463,-0.03060913,0.033111572,0.013298035,0.007701874,-0.02760315,-0.02331543,0.024856567,0.07287598,-0.06317139,0.022094727,-0.043640137,-0.03363037,-0.03704834,-0.013694763,0.008010864,-0.00522995,0.0028095245,-0.037597656,0.031341553,0.038482666,-0.021957397,-0.041046143,0.020706177,-0.0056648254,-0.013648987,-0.00843811,-0.009254456,-0.029678345,-0.037231445,0.047546387,-0.025009155,-0.012306213,0.0067329407,-0.009429932,-0.010482788,0.0075035095,0.03881836,0.025375366,-0.008766174,0.013061523,-0.06762695,0.0067710876,-0.0181427,-0.055755615,0.003446579,0.0006637573,-0.028198242,0.017044067,-0.010147095,-0.041992188,-0.0069122314,-0.007762909,0.008399963,0.0030670166,0.005718231,-0.0004529953,-0.009529114,0.003736496,0.009239197,-0.013130188,-0.06085205,-0.016311646,-0.02079773,0.0023612976,0.060638428,-0.008491516,0.037506104,-0.0064697266,0.06512451,0.03475952,0.049682617,0.024520874,0.018127441,0.0030670166,-0.0018339157,-0.0016670227,0.05102539,-0.015548706,-0.023742676,-0.00007998943,-0.013557434,-0.064453125,-0.0015001297,-0.014572144,-0.041870117,-0.024353027,0.022201538,-0.025299072,0.022766113,-0.07873535,0.008407593,0.0041618347,0.0023422241,-0.0052223206,-0.027236938,-0.012046814,0.019042969,-0.004634857,0.0014371872,-0.008010864,-0.04815674,0.027709961,0.0068626404,0.036102295,0.03817749,0.019332886,0.02217102,0.006210327,-0.0019989014,-0.025360107,0.010925293,-0.0028820038,-0.017608643,0.009475708,0.010803223,-0.017456055,0.018997192,-0.02104187,0.025848389,-0.051574707,0.061523438,0.0034370422,-0.00166893,0.004459381,-0.034210205,-0.006603241,0.031829834,-0.036895752,-0.0051574707,0.023849487,0.021911621,0.010879517,-0.008735657,-0.032409668,0.01965332,-0.031311035,0.008651733,-0.053649902,-0.027633667,0.027542114,-0.03286743,0.018936157,0.050445557,-0.10467529,-0.009346008,-0.035949707,0.016067505,-0.027679443,-0.0104522705,0.010231018,0.021194458,-0.010215759,-0.018844604,-0.024993896,-0.0385437,0.0008659363,0.046142578,-0.02607727,0.04989624,-0.024459839,0.01637268,0.020706177,0.01991272,0.01020813,0.017333984,-0.000057399273,-0.07507324,-0.076293945,-0.021530151,0.0065345764,-0.028961182,-0.033996582,0.016220093,-0.016067505,-0.07879639,-0.019577026,-0.016067505,0.002008438,-0.04257202,0.003042221,-0.037872314,0.019363403,-0.0056037903,-0.0579834,-0.02722168,-0.027160645,0.05770874,0.024612427,0.028518677,0.017288208,-0.010932922,0.05618286,0.03552246,-0.01928711,-0.020187378,0.013931274,-0.016677856,0.037719727,0.00040459633,0.011291504,-0.037719727,0.030838013,0.076416016,-0.00096035004,-0.025985718,-0.013160706,-0.06262207,-0.038726807,-0.0317688,0.026565552,0.0069885254,-0.006412506,0.029220581,-0.025054932,-0.03225708,0.002521515,0.018371582,0.015281677,0.04864502,0.020904541,-0.003604889,0.031433105,0.028442383,-0.04208374,0.037841797,0.028289795,0.008583069,-0.023025513,-0.043548584,0.021438599,0.05065918,-0.034423828,0.018112183,-0.008361816,0.028030396,-0.015777588,0.001832962,0.017318726,-0.014915466,-0.02835083,-0.01687622,-0.015289307,0.03125,0.007911682,-0.024734497,-0.028930664,-0.07501221,0.051208496,0.048583984,0.043060303,-0.0005311966,0.0038547516,-0.014221191,-0.02444458,-0.070251465,0.056488037,0.07122803,-0.011642456,-0.000051379204,0.032196045,-0.008102417,-0.039916992,0.0071258545,-0.027786255,-0.033172607,-0.015098572,0.009094238,-0.043945312,0.0046081543,0.028961182,0.028625488,0.04852295,-0.011146545,-0.05041504,-0.028320312,-0.015716553,0.008255005,-0.021575928,0.0006928444,0.0007429123,0.017410278,0.009269714,0.0025253296,0.013771057,0.015602112,-0.0023880005,-0.000060915947,0.013442993,-0.007698059,-0.027008057,0.020385742,0.005443573,-0.051696777,-0.001578331,-0.0058288574,0.06561279,-0.04776001,0.04434204,-0.011245728,0.008651733,0.049621582,-0.0008416176,-0.045684814,0.0066871643,0.019302368,0.021133423,0.042175293,0.019561768,-0.018722534,-0.019561768,0.075927734,-0.008338928,-0.00091552734,0.015945435,0.012481689,0.04711914,-0.007904053,-0.05722046,-0.033447266,-0.002090454,-0.03866577,0.024383545,-0.0154418945,0.032958984,-0.015991211,0.00087451935,-0.022659302,0.0017766953,-0.02255249,0.0012435913,-0.015304565,0.0140686035,-0.031433105,-0.02357483,0.021606445,0.0065689087,-0.0028362274,0.016693115,0.048706055,0.0069770813,-0.0012845993,-0.022949219,-0.032348633,-0.0079956055,-0.0042533875,0.007419586,0.0046806335,0.018661499,0.040985107,-0.029220581,0.0057525635,0.022338867,0.013298035,0.0309906,0.007873535,-0.0039253235,-0.066345215,-0.042938232,-0.027648926,-0.04309082,0.026443481,0.00630188,-0.010169983,0.0579834,0.018600464,-0.015533447,-0.03652954,0.018356323,-0.054748535,-0.0045318604,0.032592773,-0.02166748,-0.031677246,0.0056533813,-0.0077285767,0.00065517426,0.0368042,0.02508545,0.045654297,0.065979004,0.03817749,0.005844116,0.022644043,0.0006928444,0.028320312,0.013580322,-0.029815674,-0.034362793,-0.028518677,0.025650024,-0.022979736,-0.016235352,-0.07208252,0.05050659,0.039978027,0.08477783,0.014724731,0.0072402954,0.029663086,-0.0002872944,0.018035889,-0.025650024,-0.011276245,-0.025604248,-0.03503418,0.022644043,-0.01134491,-0.00945282,-0.019943237,0.033843994,-0.006275177,0.012214661,-0.028167725,0.046051025,-0.022399902,-0.013427734,0.023010254,0.020690918,0.052520752,0.05911255,-0.03817749,0.020767212,0.024627686,-0.03967285,0.0129852295,0.03817749,-0.008712769,-0.0051574707,-0.04333496,-0.022903442,-0.0063056946,-0.019363403,-0.0519104,0.008384705,0.01423645,0.025268555,0.019042969,-0.0060539246,-0.022506714,-0.0057678223,-0.019866943,-0.047729492,0.014877319,-0.03414917,0.013618469,0.048431396,-0.025680542,0.0060272217,-0.0012922287,-0.0051078796,-0.00025177002,0.011009216,0.02293396,0.0014801025,-0.04336548,0.035736084,-0.00050115585,0.0119018555,0.01007843,0.024795532,0.026138306,0.029678345,0.050567627,0.015174866,-0.0211792,-0.06781006,0.01612854,-0.043792725,-0.0010700226,0.026565552,-0.027526855,-0.004058838,-0.0141067505,-0.026473999,-0.014556885,0.013412476,-0.024612427,-0.0035686493,0.022750854,-0.010597229,-0.021484375,-0.05722046,-0.019821167,0.0030651093,0.061279297,0.011184692,0.020019531,-0.06750488,-0.0024108887,0.03466797,0.006324768,0.029067993,-0.0140686035,0.00083112717,-0.023071289,-0.034423828,-0.01890564,-0.020843506,0.032714844,-0.009994507,0.0010700226,0.025665283,-0.00061273575,0.016326904,0.012145996,0.0069084167,0.019851685,-0.011688232,-0.013069153,0.0007123947,0.041900635,0.016555786,-0.023284912,-0.04824829,0.034423828,-0.0018777847,0.040283203,-0.044189453,-0.012512207,-0.013839722,0.0078125,0.0059318542,-0.014144897,-0.009490967,-0.016708374,-0.041229248,-0.061431885,0.049713135,-0.015159607,0.031280518,0.036743164,0.005355835,0.029815674,-0.007587433,-0.007522583,0.014839172,-0.025268555,-0.0050964355,-0.022644043,-0.031341553,-0.01473999,-0.019104004,-0.027542114,0.030883789,-0.017669678,0.02017212,0.01285553,-0.019470215,0.033599854,0.0029144287,0.0027427673,0.008918762,0.0062561035,0.024093628,0.03149414,0.014030457,-0.057373047,0.016662598,0.0011854172,0.0069465637,-0.0018424988,0.04296875,0.023330688,-0.008552551,-0.008392334,-0.01713562,-0.020767212,-0.027313232,0.002670288,0.0115737915,0.008758545,0.003414154,-0.036071777,0.019119263,0.000538826,-0.0385437,-0.038635254,0.0134887695,0.016494751,-0.035461426,0.017944336,0.028839111,0.05303955,-0.017166138,0.00308609,0.011039734,0.037200928,0.041778564,0.0071640015,-0.006526947,0.02128601,-0.0138549805,0.017288208,0.0020637512,-0.011581421,0.019165039,0.005783081,0.01725769,0.026626587,0.008087158,-0.016159058,-0.039245605,-0.002588272,-0.007068634,-0.024871826,0.02708435,0.009384155,0.0446167,-0.019042969,0.013366699,0.014587402,-0.01977539,-0.021591187,-0.008522034,0.033172607,-0.020217896,-0.007633209,0.008628845,0.019073486,0.028121948,-0.061309814,-0.0026855469,0.00051403046,0.011665344,-0.013839722,-0.048431396,-0.044281006,0.0060920715,0.044647217,0.005443573,0.018463135,0.029556274,-0.0010032654,0.011161804,0.029968262,-0.006149292,-0.015075684,-0.010597229,-0.05053711,-0.027160645,-0.0037174225,-0.0011529922,-0.031433105,0.017181396,-0.007701874,-0.024627686,0.006828308,-0.02293396,-0.000746727,-0.016220093,0.01574707,0.037597656,0.004386902,0.012962341,-0.005458832,-0.03253174,0.009002686,0.0065612793,0.02420044,-0.03741455,0.025756836,-0.012191772,-0.0064964294,-0.0052986145,0.01008606,0.024520874,0.017349243,0.014915466,0.038848877,-0.03945923,0.041046143,-0.03366089,0.013504028,-0.00049734116,-0.030883789,-0.009315491,-0.0256958,-0.014060974,0.0390625,-0.022399902,-0.016189575,-0.030471802,-0.036499023,-0.009788513,-0.049743652,0.015327454,0.034576416,0.035247803,-0.024230957,0.0018339157,-0.004852295,0.018356323,-0.008178711,0.0027427673,-0.01737976,0.026519775,0.025543213,-0.0010299683,-0.033294678,-0.026901245,-0.021530151,-0.0075798035,-0.043273926,-0.047912598,-0.008995056,0.01852417,-0.004737854,-0.008117676,-0.032470703,-0.032165527,-0.00044202805,-0.038970947,0.008224487,0.006816864,0.015174866,-0.0031909943,-0.024368286,-0.0048217773,0.012565613,-0.0060043335,0.03866577,0.009506226,-0.0023975372,-0.0524292,0.014015198,0.013183594,0.02861023,-0.0043907166,-0.019119263,-0.010032654,-0.016418457,-0.05178833,-0.0016670227,-0.006629944,-0.021743774,-0.009941101,0.002855301,-0.055358887,-0.0026741028,-0.022598267,-0.00055742264,0.021484375,0.009986877,0.012931824,0.0026741028,0.015281677,-0.0023040771,-0.0077171326,-0.03274536,0.013069153,0.010047913,0.00472641,0.028213501,0.061920166,0.0020694733,-0.021224976,0.012512207,0.0022792816,0.009857178,-0.021575928,0.016311646,-0.014984131,0.014442444,-0.00970459,-0.0078125,-0.0413208,-0.010719299,0.08886719,0.00030636787,-0.012428284,-0.016601562,-0.01574707,0.013122559,0.031280518,-0.03112793,0.007144928,-0.025558472,0.028213501,-0.020462036,0.0063171387,0.009300232,0.02281189,-0.017501831,-0.047088623,-0.01914978,-0.010063171,-0.010253906,-0.0647583,-0.02619934,-0.070129395,-0.00093078613,-0.005428314,-0.02168274,0.0015153885,0.008155823,-0.01826477,-0.089538574,0.0016593933,0.04940796,0.0158844,0.034973145,-0.010406494,0.023498535,0.024932861,-0.036865234,-0.003643036,0.02204895,-0.026290894,-0.0178833,-0.021118164,0.019485474,-0.01084137,-0.014389038,-0.0033798218,0.012397766,0.021057129,-0.009628296,0.009979248,-0.012741089,0.013504028,-0.021255493,0.012863159,-0.014480591,-0.010559082,0.032043457,-0.045715332,0.03213501,0.0042381287,-0.008972168,0.0058288574,0.0395813,0.03805542,-0.036193848,-0.014183044,0.011383057,0.008033752,0.039764404,-0.020385742,0.051879883,0.014030457,-0.016998291,0.012321472,-0.014122009,-0.0070991516,-0.025436401,-0.028244019,0.014953613,0.0021800995,0.009460449,-0.0206604,-0.00009691715,0.017700195,0.010513306,0.0074539185,-0.0050315857,-0.023971558,-0.02128601,0.00029802322,0.008811951,0.0051727295,0.0005054474,0.019165039,0.022094727,0.046783447,0.011459351,-0.021362305,-0.0012540817,0.029220581,-0.014183044,0.006778717,0.026000977,0.010040283,0.010910034,0.016433716,0.018188477,-0.049865723,-0.02470398,-0.020263672,-0.010398865,-0.006401062,-0.00844574,-0.016159058,-0.00774765,0.010055542,-0.0076446533,-0.033416748,-0.0047416687,-0.020706177,-0.03475952,-0.0065078735,-0.020187378,0.030090332,0.010101318,0.009208679,0.0056037903,-0.008468628,0.037017822,-0.002407074,-0.018814087,0.032470703,0.030303955,0.010971069,-0.03540039,-0.0005354881,-0.013000488,-0.011810303,0.0116119385,-0.035308838,0.014083862,0.036193848,-0.013061523,0.004459381,0.0033893585,0.026168823,-0.009811401,0.006565094,-0.016677856,0.013748169,-0.01084137,0.04083252,-0.05267334,0.028961182,0.014137268,0.0017251968,-0.0154953,-0.0041770935,-0.027297974,0.012245178,0.006969452,-0.014099121,0.05633545,0.011383057,0.030456543,-0.023513794,-0.021011353,0.0041885376,-0.028320312,-0.024108887,0.012382507,-0.017471313,0.00094127655,0.014854431,-0.032714844,0.033966064,-0.03829956,0.010955811,0.0070533752,0.012481689,-0.005367279,-0.027709961,0.002532959,-0.01335144,-0.012817383,0.008468628,-0.00068855286,0.052368164,0.014312744,0.023071289,0.049560547,0.018707275,0.0045280457,-0.036743164,-0.033233643,0.0052719116,-0.0052375793,0.02520752,-0.017868042,0.057525635,0.035980225,-0.0006093979,0.04473877,0.033996582,0.04425049,-0.004180908,0.009643555,-0.019866943,0.019897461,-0.005584717,0.028503418,-0.0035266876,0.033447266,-0.028808594,0.034240723,0.016204834,0.03289795,-0.031829834,0.034484863,0.0748291,0.017120361,-0.012573242,0.040496826,-0.010276794,-0.015327454,-0.016036987,-0.022232056,0.056243896,0.0039901733,0.042877197,0.056121826,0.014328003,-0.0017232895,0.020874023,-0.02267456,-0.015609741,0.061462402,0.017120361,-0.017349243,-0.005886078,-0.008903503,0.013038635,-0.04031372,-0.021850586,0.01878357,-0.011955261,0.006664276,0.0029830933,-0.000161767,-0.009262085,0.008766174,0.016906738,0.013450623,-0.0038604736,0.02911377,0.03640747,0.0011291504,0.017028809,-0.0021915436,0.013542175,-0.027374268,-0.021133423,0.021224976,0.027038574,-0.006401062,-0.011505127,0.029266357,0.0009522438,0.03604126,0.042388916,-0.016647339,0.003408432,0.031219482,0.013389587,-0.0079574585,0.055419922,0.035186768,0.01576233,0.039276123,0.028930664,0.043060303,-0.042999268,0.025390625,-0.00023388863,0.0011043549,-0.012283325,-0.0027942657,0.0077552795,-0.012207031,0.015510559,-0.0045051575,-0.019729614,0.015235901,0.022720337,-0.008644104,-0.010383606,-0.007911682,0.0107040405,-0.02809143,-0.0014896393,0.0031642914,-0.015213013,0.035980225,0.011726379,0.023376465,-0.02420044,0.025848389,-0.00422287,-0.007221222,0.004711151,0.027114868,-0.039215088,0.0011110306,-0.0034046173,0.010231018,-0.050476074,0.0015468597,0.018600464,-0.007911682,0.011619568,0.017044067,-0.009239197,-0.009887695,0.028167725,0.019454956,0.00018787384,-0.01260376,-0.019943237,0.022567749,0.047698975,-0.002609253,-0.0036563873,-0.031433105,-0.010231018,0.00522995,-0.005744934,-0.0073623657,-0.010620117,-0.014099121,-0.013389587,0.025039673,0.039215088,0.020553589,0.05429077,-0.025787354,-0.008430481,0.008743286,0.030715942,0.0024108887,-0.0053253174,-0.0035591125,0.0011291504,-0.017868042,0.053619385,0.033935547,0.015075684,0.036254883,-0.0024909973,-0.02180481,0.006668091,-0.009346008,0.024612427,-0.0119018555,-0.0005288124,-0.0025253296,0.041015625,-0.020385742,-0.03527832,0.004585266,-0.025527954,-0.02279663,-0.017456055,0.012916565,0.0028152466,0.029220581,0.038269043,0.031951904,-0.020828247,0.057678223,-0.015899658,0.05493164,0.0021591187,-0.015548706,0.049713135,0.016845703,0.03894043,0.013198853,0.011817932,-0.031921387,0.02394104,0.02583313,0.024871826,0.01272583,0.004432678,-0.017486572,0.040130615,-0.0035820007,0.028060913,-0.0090789795,0.0042419434,0.017990112,-0.008079529,-0.012916565,-0.010597229,-0.0018434525,0.016784668,0.0501709,-0.025680542,-0.014213562,-0.028320312,-0.015670776,0.020553589,-0.017410278,0.005290985,-0.0044670105,-0.016311646,0.0135269165,-0.030654907,-0.02357483,0.00806427,0.02885437,-0.05090332,-0.010978699,0.0022068024,0.017486572,-0.013580322,0.03881836,0.025772095,-0.0015602112,0.00674057,0.04864502,-0.009635925,0.032592773,-0.012512207,0.028060913,0.031799316,0.008430481,-0.024124146,0.0012283325,0.0050315857,-0.016296387,0.015380859,0.04260254,-0.016662598,0.0059547424,-0.009353638,-0.010665894,0.0016641617,0.0024662018,-0.012863159,0.006416321,-0.004878998,-0.012634277,0.0040893555,0.007820129,-0.0099105835,0.003211975,0.0069084167,-0.019073486,0.007007599,0.03274536,0.013366699,-0.034362793,-0.017608643,0.01084137,0.009399414,-0.01625061,-0.019134521,-0.0051193237,-0.033966064,0.006340027,0.013183594,0.01876831,0.009941101,-0.025558472,-0.0010089874,0.027145386,0.015930176,0.019485474,0.0056915283,-0.006275177,0.015823364,-0.010757446,-0.0022945404,-0.008468628,-0.0052604675,0.012130737,0.022903442,0.004283905,-0.024246216,0.011199951,-0.0073623657,0.014457703,0.0021858215,-0.010719299,0.012145996,-0.010269165,-0.00008183718,0.0031929016,0.010864258,-0.016967773,-0.016159058,-0.0084991455,0.03161621,0.057922363,-0.01399231,-0.008125305,0.026748657,0.0146102905,0.018829346,0.03604126,0.0031528473,0.04547119,0.030960083,-0.014953613,-0.018356323,0.023590088,-0.021697998,-0.023880005,0.013725281,-0.018234253,-0.009513855,0.018051147,0.020141602,0.0043640137,-0.038726807,-0.006111145,-0.012062073,-0.01512146,0.016082764,-0.01876831,0.017028809,-0.03475952,-0.013450623,0.010398865,-0.024002075,-0.04333496,-0.018417358,-0.013008118,-0.009757996,-0.048858643,0.0069084167,-0.027832031,0.015098572,-0.026657104,0.0022888184,-0.009979248,0.009094238,-0.0154953,-0.01197052,0.0054397583,0.026565552,0.027450562,0.011985779,0.023010254,-0.032989502,-0.015136719,-0.033355713,0.011688232,-0.01512146,0.025985718,-0.0040283203,0.027313232,0.030532837,-0.011985779,-0.0026111603,-0.007972717,-0.0071525574,-0.021636963,-0.023635864,-0.02659607,0.025497437,0.015342712,-0.0030517578,-0.018035889,0.041748047,-0.026885986,-0.014480591,0.030731201,0.038879395,0.018112183,0.03579712,-0.018173218,0.0012683868,-0.020996094,-0.0025482178,-0.023849487,0.0034828186,-0.00030994415,0.015930176,-0.0016965866,0.0063972473,0.019073486,-0.0058670044,0.0027637482,0.032440186,0.0067863464,0.0056114197,0.03149414,-0.0019683838,0.007633209,-0.018356323,-0.004486084,0.02116394,0.0463562,0.0048675537,0.007408142,-0.0023860931,0.0047187805,-0.020889282,0.0028705597,0.024795532,-0.015083313,-0.05178833,-0.01222229,-0.024017334,0.020080566,0.002954483,0.006362915,-0.005176544,0.019042969,-0.016998291,-0.038726807,-0.0317688,0.032806396,0.015022278,-0.018875122,-0.011749268,0.010108948,0.011985779,-0.037994385,0.0075950623,-0.04510498,-0.037200928,-0.009437561,-0.021606445,0.027267456,0.000875473,-0.0070495605,-0.006580353,-0.008811951,-0.0067596436,0.0021514893,0.018554688,-0.014762878,-0.011688232,0.026489258,0.028213501,-0.0098724365,0.024993896,-0.008735657,0.004688263,0.011329651,-0.0135269165,0.013366699,-0.022949219,0.03173828,-0.012489319,-0.010108948,0.031341553,-0.004196167,0.010643005,-0.04385376,-0.0048828125,-0.0031089783,-0.012168884,0.0357666,-0.032470703,-0.019927979,0.0071640015,-0.021408081,-0.03086853,0.0045318604,0.0132751465,0.022491455,-0.0036525726,0.04837036,-0.019180298,-0.016052246,0.013725281,0.011108398,-0.023666382,-0.00026130676,0.031707764,-0.000035703182,-0.0033092499,-0.00308609,-0.01512146,-0.029830933,-0.009880066,0.01789856,-0.0079956055,-0.00844574,0.027938843,0.01777649,0.04559326,-0.0048713684,0.02104187,0.0038204193,0.0087890625,0.030349731,0.0039482117,0.054748535,-0.008583069,-0.025436401,0.00076532364,0.0005812645,-0.023895264,0.012710571,-0.0049743652,-0.0020713806,-0.03387451,0.014671326,-0.0027999878,0.02456665,-0.0134887695,0.009971619,-0.025222778,-0.012207031,-0.033111572,0.00090026855,-0.027526855,0.006389618,0.031433105,0.0004911423,0.028015137,-0.011703491,-0.02407837,0.011497498,0.044708252,-0.0042686462,-0.028503418,-0.020767212,0.0121154785,0.0024776459,0.022766113,0.0085372925,-0.020721436,-0.022735596,0.010787964,-0.018493652,0.003709793,-0.011619568,0.017120361,0.009552002,-0.009025574,-0.017623901,0.032318115,-0.0067710876,-0.000320673,0.0072135925,0.0025577545,0.026733398,0.029830933,-0.011047363,0.015716553,0.017089844,-0.05029297,0.06262207,0.0056037903,0.027496338,-0.019180298,-0.002910614,-0.034606934,-0.02508545,-0.021606445,0.0051574707],"createdAt":"2026-04-18T19:26:01.689Z","updatedAt":"2026-04-23T13:01:59.350Z","lastSeenAt":"2026-04-23T13:01:59.350Z","tsv":"'/api/v1/transactions/308':56,158 '/request':13,28,149 '0.02':12,27,80,148 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'absent':161 'accept':46 'access':62 'actual':216 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,84,105,165 'avail':223 'base':8,23,51,75 'broader':101 'call':4,19,82 'categori':106 'chain':99 'challeng':67,212 'classif':122 'connect':174 'content':180 'convers':139 'crawl':163 'crypto-paid API' 'data':108,112,194 'descript':191 'doc':164 'document':153 'embed':123 'endpoint':55,142,157,200,203 'essenti':160 'estim':133 'exampl':188 'exchang':128 'export':113 'feed':127 'financ':124 'function':196 'gas':132 'generat':140 'geocod':137 'howev':152 'i.e':79 'includ':107 'individu':95 'infrastructur':135 'insight':114 'json-response' 'key':85 'learn':117 'limit':87 'list':58,144 'live':205 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'materi':224 'metric':110 'multipl':104 'network':9,24,52 'no-api-key' 'on-chain':97 'openapi':184 'page':169 'particular':198 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,219 'per':3,18,36,81 'platform':6,21,39,102 'point':151 'premium':60 'price':126,150,166 'prompt':176 'protocol':44 'provid':201 'quot':131 'rate':86,129 'readm':168 'report':111 'request':37,93 'request/response':187 'requir':68,91 'respond':207 'return':64,171,217 'schema':185 'sentiment':118 'settl':96 'specif':54,156 'subscript':89 'summar':121 'text':120 'token':130 'transact':199 'transactions API' 'unit':76 'unknown':221 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':136 'valid':138,210 'via':10,25 'wallet':175 'web3':125 'x402':11,26,43,211 'x402 API' 'x402-payment'","prices":[{"id":"234e9238-4f16-4059-8c0a-37dfaa4dd641","listingId":"c225ed5f-44d0-4bea-bdf5-d8db38d35c24","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/transactions/308","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:01.689Z"}],"sources":[{"listingId":"c225ed5f-44d0-4bea-bdf5-d8db38d35c24","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/308","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:01.689Z","lastSeenAt":"2026-04-23T13:01:59.350Z"}],"details":{"listingId":"c225ed5f-44d0-4bea-bdf5-d8db38d35c24","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/308\n# Returns 402 with x402 challenge. Attach X-PAYMENT header with valid USDC payment to receive response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/308"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/308"}],"useCases":["Accessing premium transaction data with per-call USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Programmatic on-chain payment for API access on Base L2"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer on-chain USDC settlement over subscriptions"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.068Z"},"updatedAt":"2026-04-23T13:01:59.350Z"}}