{"id":"55ba9a9a-b9c1-4472-b773-4f1417abda2e","shortId":"aPkkmk","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 at `/api/v1/transactions/20` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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 is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/20` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/transactions/20 ('Premium API Access') is undocumented","No information on uptime, SLA, or support"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/20","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/20","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, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The purpose of the specific /api/v1/transactions/20 endpoint is unclear beyond its generic label.","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":"2026-04-19T12:30:18.437Z","embedding":[-0.03579712,-0.033081055,0.03186035,0.012779236,0.017715454,-0.026763916,-0.0231781,0.023147583,0.077819824,-0.06298828,0.021057129,-0.042816162,-0.0395813,-0.030014038,-0.02255249,0.0046043396,-0.0018472672,0.0029773712,-0.030136108,0.026397705,0.030014038,-0.011367798,-0.035125732,0.021697998,-0.0002450943,-0.008911133,-0.009963989,-0.0002567768,-0.020324707,-0.041778564,0.048614502,-0.025787354,-0.0020370483,0.00554657,-0.011230469,-0.014564514,0.00932312,0.025360107,0.0335083,-0.00484848,0.007080078,-0.053649902,0.0015239716,-0.026550293,-0.04949951,-0.0019264221,0.00289917,-0.025756836,0.011444092,0.0013093948,-0.03768921,-0.009712219,-0.01537323,0.011787415,0.0060577393,0.0025024414,-0.0054092407,-0.014846802,0.005207062,0.011138916,-0.013442993,-0.058258057,-0.020751953,-0.013191223,0.0030918121,0.057525635,-0.011749268,0.03363037,0.005142212,0.064086914,0.0390625,0.046325684,0.028793335,0.016311646,-0.00018072128,0.0041542053,-0.010871887,0.056427002,-0.01020813,-0.023773193,-0.009025574,-0.0036182404,-0.06439209,0.0066070557,-0.021316528,-0.04345703,-0.01637268,0.022155762,-0.02041626,0.027938843,-0.07537842,0.004863739,-0.0062294006,-0.0020332336,0.0027103424,-0.0088272095,-0.0074882507,0.027999878,-0.012359619,0.010261536,-0.009819031,-0.043792725,0.020996094,0.008728027,0.033447266,0.042175293,0.016647339,0.02017212,0.0124435425,-0.0036888123,-0.029846191,0.015914917,-0.0027751923,-0.014884949,0.008506775,0.005420685,-0.014755249,0.010635376,-0.023284912,0.022384644,-0.049926758,0.052856445,0.00381279,0.00749588,0.0036525726,-0.04751587,-0.013084412,0.025146484,-0.03074646,-0.004547119,0.02268982,0.019195557,0.027130127,-0.021865845,-0.03543091,0.019439697,-0.030197144,-0.0051460266,-0.053009033,-0.029586792,0.039611816,-0.033081055,0.015029907,0.036315918,-0.104003906,-0.0071525574,-0.047302246,0.016662598,-0.034240723,-0.0063171387,0.0011234283,0.027313232,-0.016174316,-0.016036987,-0.026306152,-0.030090332,0.0027389526,0.039611816,-0.01789856,0.04827881,-0.025375366,0.022979736,0.019927979,0.014144897,0.010726929,0.018035889,-0.002193451,-0.08105469,-0.08319092,-0.017333984,0.008506775,-0.028396606,-0.033966064,0.0066986084,-0.011016846,-0.07098389,-0.017181396,-0.01725769,0.0018177032,-0.03845215,-0.00034475327,-0.035491943,0.021987915,-0.008430481,-0.060638428,-0.03503418,-0.028289795,0.053588867,0.028152466,0.021636963,0.018814087,-0.010192871,0.059753418,0.02532959,-0.018692017,-0.012535095,0.012336731,-0.022949219,0.0178833,-0.009140015,0.013671875,-0.034484863,0.03152466,0.072753906,-0.0023784637,-0.023910522,-0.00894928,-0.060028076,-0.03869629,-0.03665161,0.020645142,0.015808105,-0.011245728,0.040283203,-0.030197144,-0.038024902,0.00074100494,0.019515991,0.018539429,0.06744385,0.014434814,-0.010093689,0.030807495,0.01448822,-0.054626465,0.047027588,0.0390625,0.0045814514,-0.028320312,-0.041259766,0.029663086,0.053009033,-0.027145386,0.012672424,-0.008285522,0.021896362,-0.009849548,-0.007045746,0.021606445,-0.013450623,-0.024261475,-0.023071289,-0.026657104,0.03552246,0.009735107,-0.032470703,-0.03540039,-0.08404541,0.05392456,0.04135132,0.046813965,-0.0003170967,0.005393982,-0.016342163,-0.0050964355,-0.072509766,0.054992676,0.06982422,-0.004016876,-0.006565094,0.028869629,-0.0077934265,-0.037017822,0.010597229,-0.023529053,-0.027496338,-0.027542114,0.017318726,-0.04598999,-0.0026931763,0.024673462,0.027175903,0.045440674,-0.004257202,-0.050476074,-0.0236969,-0.004383087,0.0019989014,-0.024429321,0.00349617,-0.0029964447,0.015625,0.016784668,0.003326416,0.016159058,0.001581192,0.000518322,0.0020370483,0.0067825317,-0.008087158,-0.028686523,0.01651001,0.002035141,-0.05722046,0.0018873215,-0.0017976761,0.0814209,-0.051208496,0.04055786,-0.010818481,0.0132751465,0.05050659,-0.009246826,-0.043151855,0.0043144226,0.02696228,0.014381409,0.039855957,0.017501831,-0.032043457,-0.020095825,0.07098389,-0.0035190582,-0.0012187958,0.006713867,0.018600464,0.04522705,-0.01159668,-0.062561035,-0.036254883,-0.0001989603,-0.046966553,0.024627686,-0.023040771,0.026046753,-0.018341064,-0.0007123947,-0.026290894,0.0031318665,-0.03540039,0.008888245,-0.017196655,0.004753113,-0.023635864,-0.021453857,0.020324707,0.01083374,-0.011726379,0.009086609,0.039855957,0.022201538,-0.0023059845,-0.035217285,-0.024627686,-0.0065345764,-0.003993988,0.017501831,0.017150879,0.020065308,0.046661377,-0.03945923,-0.00040459633,0.02180481,0.019836426,0.030700684,-0.004814148,-0.0012979507,-0.06427002,-0.050354004,-0.02734375,-0.04269409,0.026367188,0.015464783,-0.014633179,0.050231934,0.014503479,-0.017974854,-0.036071777,0.016708374,-0.04876709,-0.0027675629,0.04309082,-0.019104004,-0.021636963,0.0038166046,-0.005420685,0.0087890625,0.031402588,0.019470215,0.036865234,0.0647583,0.042785645,0.00919342,0.022781372,-0.0025520325,0.030853271,0.009986877,-0.023086548,-0.03982544,-0.021255493,0.03164673,-0.02468872,-0.014541626,-0.06628418,0.04788208,0.044006348,0.087646484,0.024612427,0.0063095093,0.02243042,-0.011161804,0.01512146,-0.022598267,-0.02029419,-0.02507019,-0.043670654,0.02670288,-0.012481689,-0.0046310425,-0.014472961,0.0413208,0.0026016235,0.019729614,-0.02458191,0.04324341,-0.019363403,-0.016036987,0.017242432,0.017120361,0.049346924,0.062347412,-0.038879395,0.030014038,0.026885986,-0.02507019,0.0038661957,0.03451538,-0.01473999,-0.009147644,-0.04916382,-0.0262146,-0.011123657,-0.0090789795,-0.04248047,0.012893677,0.013824463,0.025604248,0.02331543,-0.0032100677,-0.019073486,0.0036773682,-0.01626587,-0.054107666,0.0037212372,-0.040893555,0.00699234,0.04559326,-0.021972656,-0.0036182404,0.0004017353,-0.0011425018,0.006668091,0.00944519,0.0135269165,-0.0014657974,-0.04598999,0.026947021,0.003932953,0.009666443,0.014160156,0.027420044,0.01360321,0.0259552,0.058013916,0.017074585,-0.015808105,-0.06604004,0.015571594,-0.044433594,-0.0037384033,0.02166748,-0.032165527,-0.006160736,-0.015899658,-0.027709961,-0.017547607,0.013946533,-0.0284729,0.0038661957,0.021118164,-0.01626587,-0.025131226,-0.059753418,-0.026412964,-0.00013887882,0.065979004,0.018569946,0.012077332,-0.06939697,-0.003540039,0.020065308,0.008377075,0.039642334,-0.015014648,-0.0020751953,-0.018951416,-0.041015625,-0.013519287,-0.024261475,0.024856567,-0.00995636,0.0008158684,0.018661499,0.009788513,0.027572632,0.008644104,0.00945282,0.026260376,-0.015701294,-0.010902405,-0.007774353,0.03390503,0.016464233,-0.012641907,-0.052337646,0.03768921,0.015464783,0.03274536,-0.048095703,-0.0074157715,-0.015106201,0.0010356903,0.013145447,-0.009086609,-0.0076522827,-0.007423401,-0.042022705,-0.060180664,0.045440674,-0.026306152,0.02645874,0.022460938,0.0027580261,0.027999878,-0.008110046,-0.004558563,0.011009216,-0.028076172,-0.008506775,-0.024917603,-0.034423828,-0.012580872,-0.0138549805,-0.033843994,0.027236938,-0.026123047,0.013931274,0.007675171,-0.016571045,0.03314209,-0.004005432,-0.0035190582,0.019805908,0.0026359558,0.02670288,0.028793335,0.0068473816,-0.04876709,0.021438599,-0.004928589,0.010261536,-0.0048446655,0.045196533,0.028427124,-0.0068588257,-0.008346558,-0.01600647,-0.02229309,-0.02607727,-0.0014181137,0.0082473755,0.0104522705,0.0047912598,-0.034606934,0.01473999,0.005332947,-0.029022217,-0.029418945,0.011642456,0.014015198,-0.0317688,0.019042969,0.031219482,0.054992676,-0.017440796,0.0042686462,0.003917694,0.031829834,0.035705566,0.015319824,-0.008804321,0.019699097,-0.012763977,0.013191223,-0.002571106,-0.014595032,0.014564514,0.002626419,0.022628784,0.026367188,0.006828308,-0.021881104,-0.038146973,-0.0033664703,-0.012496948,-0.028366089,0.02381897,0.019088745,0.03186035,-0.024429321,0.021774292,0.019714355,-0.019088745,-0.016921997,-0.013999939,0.043823242,-0.018615723,-0.010604858,0.01638794,0.0181427,0.029907227,-0.058746338,-0.007701874,0.0065078735,0.016616821,-0.0155181885,-0.042022705,-0.043029785,0.0010728836,0.03967285,0.012191772,0.022872925,0.04046631,0.011497498,0.012321472,0.035308838,-0.008834839,-0.015792847,-0.015655518,-0.046569824,-0.024536133,-0.013473511,0.0005631447,-0.030014038,0.01626587,-0.0023517609,-0.03137207,0.01020813,-0.01713562,-0.00018525124,-0.01979065,0.016052246,0.040283203,0.0077400208,0.020523071,-0.010231018,-0.03781128,0.0033569336,0.009757996,0.020690918,-0.04144287,0.020477295,-0.012420654,-0.008529663,0.000869751,0.012214661,0.024856567,0.02468872,0.011199951,0.03643799,-0.04840088,0.052490234,-0.039245605,0.01373291,0.0072784424,-0.0395813,-0.015625,-0.023361206,-0.016159058,0.040740967,-0.031555176,-0.0061416626,-0.033233643,-0.030883789,-0.013969421,-0.052093506,0.011756897,0.043548584,0.034729004,-0.025909424,-0.00064468384,-0.0023670197,0.012336731,-0.011657715,0.008079529,-0.020721436,0.029525757,0.024429321,0.0018491745,-0.031036377,-0.022949219,-0.024765015,-0.009429932,-0.04324341,-0.0513916,-0.010803223,0.0022182465,-0.009513855,-0.01637268,-0.030670166,-0.03353882,0.0021305084,-0.03866577,0.010139465,0.0077667236,0.022842407,0.0010032654,-0.027999878,-0.0015277863,0.013931274,-0.016845703,0.038909912,0.0029907227,-0.0049705505,-0.047332764,0.013587952,0.018203735,0.02027893,-0.0093688965,-0.016799927,-0.010635376,-0.019638062,-0.059020996,-0.0069274902,-0.008529663,-0.019165039,-0.014556885,0.0011396408,-0.052825928,-0.0041389465,-0.018478394,0.0046691895,0.019302368,0.011062622,0.018112183,-0.006290436,0.01348114,-0.004085541,-0.003665924,-0.031173706,0.010505676,0.010978699,0.005306244,0.030059814,0.055877686,-0.00207901,-0.02230835,0.009269714,0.007217407,0.016464233,-0.022140503,0.011924744,-0.018997192,0.009643555,-0.010238647,-0.010765076,-0.044189453,-0.0006790161,0.0859375,-0.0069847107,-0.0146102905,-0.016235352,-0.015403748,0.018203735,0.029693604,-0.034301758,-0.0046806335,-0.023773193,0.026870728,-0.028213501,0.0071907043,-0.000023007393,0.02368164,-0.014381409,-0.055877686,-0.02444458,-0.012458801,-0.007232666,-0.060913086,-0.030212402,-0.06463623,-0.0010633469,-0.0075263977,-0.020858765,0.002714157,0.009422302,-0.015655518,-0.080078125,-0.0043640137,0.05328369,0.006767273,0.027740479,-0.008399963,0.026687622,0.029373169,-0.03152466,-0.003227234,0.023635864,-0.031555176,-0.014556885,-0.022415161,0.015159607,-0.012718201,-0.016784668,0.0065574646,0.010032654,0.015975952,-0.009750366,0.009559631,-0.0071792603,0.018371582,-0.02458191,0.0146102905,-0.017944336,-0.015960693,0.035125732,-0.04309082,0.02319336,0.012756348,-0.016647339,0.0019264221,0.03186035,0.03869629,-0.032043457,-0.018936157,0.018875122,0.0138549805,0.032470703,-0.022598267,0.04815674,0.011268616,-0.0178833,0.016708374,-0.0074501038,-0.012756348,-0.027069092,-0.028717041,0.017974854,0.0005068779,0.009864807,-0.020233154,-0.0036315918,0.012336731,0.006088257,0.009780884,-0.0050315857,-0.02571106,-0.02760315,0.00087833405,0.0055236816,0.0016698837,-0.00013709068,0.023208618,0.028579712,0.04144287,0.014289856,-0.018005371,0.009811401,0.030929565,-0.010635376,0.0035324097,0.028030396,0.004611969,0.02281189,0.012329102,0.01586914,-0.050994873,-0.021514893,-0.025970459,-0.014289856,-0.009506226,-0.0053520203,-0.015777588,-0.008125305,0.002046585,-0.0076789856,-0.027389526,0.00073099136,-0.02520752,-0.028045654,-0.0050964355,-0.020843506,0.025924683,0.004764557,0.006855011,0.010437012,-0.009300232,0.040802002,-0.0039253235,-0.017120361,0.027069092,0.026229858,0.021408081,-0.034179688,-0.004005432,-0.015609741,-0.01083374,0.0033817291,-0.03930664,0.01159668,0.04647827,-0.019927979,-0.0026626587,0.012557983,0.021453857,-0.006477356,0.0061454773,-0.011009216,0.020446777,-0.008384705,0.034698486,-0.04876709,0.024505615,0.014183044,0.004211426,-0.011886597,-0.007827759,-0.030136108,0.017944336,0.012245178,-0.014816284,0.053710938,0.0055999756,0.031677246,-0.019638062,-0.029220581,0.008140564,-0.027175903,-0.026779175,0.022354126,-0.0077667236,0.004398346,0.017044067,-0.03050232,0.040039062,-0.03237915,0.018829346,0.004261017,0.010681152,-0.003774643,-0.01953125,0.00041913986,-0.014450073,-0.020187378,0.004180908,-0.0051460266,0.054260254,0.017959595,0.026626587,0.051818848,0.021606445,0.0042304993,-0.039611816,-0.027709961,0.0066604614,-0.012741089,0.01625061,-0.01701355,0.059020996,0.036895752,-0.00037527084,0.045135498,0.030014038,0.03579712,0.0060691833,0.008132935,-0.01701355,0.013435364,-0.0025100708,0.02645874,0.003829956,0.030212402,-0.032958984,0.030929565,0.015945435,0.02583313,-0.02998352,0.036895752,0.065979004,0.023880005,-0.015281677,0.041107178,-0.010986328,-0.008956909,-0.00995636,-0.01586914,0.06085205,0.006587982,0.049560547,0.052520752,0.014465332,0.002576828,0.020721436,-0.024383545,-0.019760132,0.06549072,0.021530151,-0.023666382,-0.012931824,0.000518322,0.011222839,-0.046142578,-0.027175903,0.023773193,-0.012008667,0.0085372925,-0.004436493,-0.007282257,-0.016983032,0.011154175,0.017471313,0.009933472,-0.010826111,0.027648926,0.036895752,-0.001613617,0.024612427,-0.0042877197,0.024673462,-0.02116394,-0.027175903,0.021575928,0.02519226,-0.0070648193,-0.0073623657,0.02482605,0.0068092346,0.029800415,0.045532227,-0.02381897,0.008026123,0.032196045,0.013244629,-0.0029239655,0.053894043,0.040039062,0.012916565,0.042999268,0.03048706,0.038513184,-0.04107666,0.029083252,0.0026741028,-0.0044784546,-0.012779236,-0.009132385,0.00015580654,-0.016174316,0.017791748,0.0011405945,-0.017303467,0.021820068,0.026153564,-0.0050239563,-0.004787445,-0.007888794,0.011695862,-0.032836914,-0.0022411346,0.009437561,-0.010635376,0.0418396,0.007297516,0.023971558,-0.027832031,0.018341064,0.0023174286,-0.012969971,0.0024738312,0.024597168,-0.0345459,0.0047683716,-0.006099701,0.0037117004,-0.058380127,0.0027217865,0.026885986,-0.013618469,0.024780273,0.012451172,-0.0032997131,-0.0068473816,0.030029297,0.013999939,-0.0056495667,-0.008987427,-0.02180481,0.030380249,0.045318604,-0.0004441738,-0.0004503727,-0.02720642,-0.0074043274,0.005329132,-0.009162903,-0.006134033,-0.00970459,-0.017364502,-0.014564514,0.023452759,0.038085938,0.018630981,0.05947876,-0.022277832,-0.013168335,0.010658264,0.03463745,0.0050697327,-0.0021324158,0.0066490173,0.011474609,-0.017807007,0.049926758,0.029449463,0.012321472,0.033325195,0.0007648468,-0.019699097,0.01033783,-0.011154175,0.022994995,-0.006046295,0.0036354065,-0.0014095306,0.03692627,-0.015640259,-0.037231445,0.005367279,-0.022415161,-0.028137207,-0.014274597,0.016784668,0.0018787384,0.023773193,0.041412354,0.026901245,-0.01637268,0.06085205,-0.019042969,0.047973633,0.0030765533,-0.012413025,0.04937744,0.015136719,0.041259766,0.020767212,0.017578125,-0.040100098,0.02166748,0.03149414,0.020996094,0.0132751465,0.004611969,-0.015586853,0.03768921,-0.0021686554,0.03137207,-0.007217407,0.0018634796,0.016326904,-0.005794525,-0.013244629,-0.00907135,-0.0064697266,0.011787415,0.05117798,-0.03265381,-0.01159668,-0.03286743,-0.010467529,0.02166748,-0.022491455,0.0009279251,0.0016183853,-0.020324707,0.012680054,-0.024780273,-0.028762817,0.006023407,0.027496338,-0.051513672,-0.012138367,0.002506256,0.021606445,-0.016921997,0.028945923,0.015960693,-0.0016956329,0.007827759,0.047027588,-0.007965088,0.031311035,-0.013130188,0.02458191,0.023529053,0.007396698,-0.02017212,0.00018501282,0.008872986,-0.014167786,0.012199402,0.03643799,-0.018341064,0.006893158,-0.0067100525,-0.0061035156,-0.0017995834,0.008285522,-0.0054016113,0.012435913,-0.008293152,-0.0110321045,0.0038661957,0.007232666,-0.005279541,0.004337311,-0.00064754486,-0.017608643,0.0041122437,0.033111572,0.018966675,-0.033172607,-0.005302429,0.00705719,0.00844574,-0.014312744,-0.010650635,-0.004337311,-0.034179688,0.013763428,0.008872986,0.011146545,0.015052795,-0.021194458,-0.0042533875,0.021850586,0.012130737,0.013877869,0.0046195984,-0.00009590387,0.017990112,-0.008926392,-0.004234314,-0.0046958923,-0.006587982,0.01550293,0.019042969,0.0013885498,-0.03475952,0.015716553,-0.003873825,0.021224976,0.00087070465,-0.012771606,0.009750366,-0.010955811,-0.00053310394,0.0020618439,0.010238647,-0.008476257,-0.011878967,-0.012176514,0.03668213,0.058166504,-0.0138168335,-0.0055503845,0.023391724,0.014411926,0.0184021,0.03491211,0.00349617,0.039276123,0.032165527,-0.013122559,-0.023452759,0.030014038,-0.0095825195,-0.029006958,0.01637268,-0.012901306,-0.015449524,0.022521973,0.016647339,-0.000600338,-0.03375244,-0.008232117,-0.010444641,-0.012306213,0.019927979,-0.011940002,0.013427734,-0.024093628,-0.013000488,0.0155181885,-0.029846191,-0.048095703,-0.023880005,-0.0075798035,-0.0049552917,-0.051940918,0.0079574585,-0.027420044,0.012336731,-0.03314209,-0.0049705505,-0.011352539,0.0112838745,-0.013549805,-0.012710571,0.007083893,0.020126343,0.025466919,0.00831604,0.023071289,-0.029663086,-0.013618469,-0.02998352,0.008384705,-0.009208679,0.025466919,0.005455017,0.035827637,0.026763916,-0.01461792,-0.0069465637,-0.010871887,-0.0019874573,-0.020629883,-0.015159607,-0.022399902,0.022918701,0.010681152,-0.012619019,-0.01285553,0.044281006,-0.033325195,-0.01878357,0.02897644,0.036315918,0.008232117,0.02861023,-0.021072388,-0.003944397,-0.01725769,0.0021076202,-0.015823364,0.00907135,0.0023918152,0.0042152405,-0.0017728806,0.00093126297,0.02166748,-0.0018634796,-0.00069093704,0.035369873,0.005592346,-0.0049819946,0.033477783,0.007835388,0.004878998,-0.01676941,-0.0072898865,0.025650024,0.044555664,0.011199951,-0.0004930496,-0.01133728,0.0011129379,-0.012779236,0.010955811,0.01525116,-0.020980835,-0.047790527,-0.022232056,-0.034698486,0.021606445,0.0001335144,0.007835388,-0.010543823,0.020568848,-0.019210815,-0.02407837,-0.025726318,0.030563354,0.013786316,-0.019088745,-0.0076522827,0.011528015,0.010368347,-0.0390625,-0.0022468567,-0.049713135,-0.03050232,-0.0045700073,-0.022628784,0.027130127,0.01020813,-0.0048217773,-0.003824234,-0.005630493,-0.0034637451,-0.00001603365,0.023666382,-0.009902954,-0.004272461,0.02947998,0.024932861,-0.014961243,0.023468018,-0.005970001,0.005897522,0.010597229,-0.01739502,0.016921997,-0.019485474,0.029190063,-0.009490967,-0.006855011,0.031219482,-0.002937317,0.012298584,-0.03668213,0.006252289,-0.0023822784,-0.011444092,0.037841797,-0.032073975,-0.017654419,0.010307312,-0.01763916,-0.022994995,0.0029907227,0.016067505,0.024490356,-0.0060691833,0.05230713,-0.011383057,-0.008491516,0.020568848,0.012512207,-0.016921997,0.0032444,0.028762817,-0.003604889,-0.0035820007,-0.0014314651,-0.019332886,-0.029953003,-0.0036621094,0.017547607,-0.013618469,-0.005054474,0.03253174,0.0151901245,0.0395813,-0.0010433197,0.021240234,0.0096206665,0.0077781677,0.025131226,0.0017280579,0.058044434,-0.0019931793,-0.028335571,0.00983429,0.002565384,-0.02067566,0.008872986,-0.0023841858,-0.00063943863,-0.037994385,0.016403198,-0.000033199787,0.023788452,-0.022750854,0.012825012,-0.02116394,-0.0113220215,-0.030776978,0.00053977966,-0.030166626,0.007297516,0.02998352,0.00484848,0.026382446,0.00033545494,-0.02645874,0.01651001,0.050628662,-0.0077400208,-0.023284912,-0.01209259,0.0093688965,0.0003080368,0.012336731,0.0031414032,-0.023086548,-0.016540527,0.00843811,-0.020629883,0.006793976,-0.0048942566,0.016296387,0.0037975311,-0.0020427704,-0.010978699,0.022994995,-0.0046157837,-0.005970001,0.0129470825,0.002811432,0.030456543,0.026779175,-0.010772705,0.018127441,0.017990112,-0.037109375,0.061401367,-0.0016174316,0.025238037,-0.02331543,0.0026893616,-0.040039062,-0.021011353,-0.022369385,0.0052719116],"createdAt":"2026-04-18T18:59:06.580Z","updatedAt":"2026-04-25T00:05:11.748Z","lastSeenAt":"2026-04-25T00:05:11.748Z","tsv":"'/api/v1/transactions/20':57,190 '/request':13,28,149 '0.02':12,27,75,148 '000':69 '20':68 '402':201 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,89,220 'across':105 'actual':192 'advertis':80 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,82,159,219 'attach':92 'base':8,23,51,70 'beyond':215 'broader':101 'call':4,19,77 'caller':90 'categori':107 'challeng':202 'classif':122 'connect':168 'convers':139 'crypto-paid API' 'data':108,112,210 'descript':186 'detail':175 'doc':158 'document':153,205 'embed':123 'endpoint':55,104,142,191,195 'estim':133 'exampl':183 'exchang':128 'export':113 'extrem':155 'feed':127 'financ':124 'four':106 'function':212 'gas':132 'generat':140 'generic':217 'geocod':137 'header':96 'howev':152 'i.e':74 'infrastructur':135 'insight':114 'instant':88 'json-response' 'key':83 'label':59,221 'learn':117 'limit':86 'list':144 'live':197 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'maximum':66 'metric':110 'network':9,24,52 'no-api-key' 'offer':103 'openapi':179 'page':163 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95 'per':3,18,36,76 'platform':6,21,39,79,102 'point':151 'post-method' 'premium':60,218 'price':126,150,160 'prompt':170 'protocol':44 'provid':214 'quot':131 'rate':85,129 'readm':162 'render':165 'report':111 'request':37,99 'request/response':182 'requir':64 'return':193,198 'schema':180 'sentiment':118 'simpli':91 'spars':156 'specif':54 'summar':121 'technic':174 'text':120 'token':130 'unclear':208 'unit':71 'usdc':15,30,47,73 'usdc-base-network' 'use':41 'util':136 'valid':138,200 'via':10,25 'wallet':169 'web3':125 'without':204 'x402':11,26,43,94 'x402 API' 'x402-payment'","prices":[{"id":"e5fb8f1d-7a3a-4a7e-8d43-37da4c36daa3","listingId":"55ba9a9a-b9c1-4472-b773-4f1417abda2e","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:06.580Z"}],"sources":[{"listingId":"55ba9a9a-b9c1-4472-b773-4f1417abda2e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:06.580Z","lastSeenAt":"2026-04-25T00:05:11.748Z"}],"details":{"listingId":"55ba9a9a-b9c1-4472-b773-4f1417abda2e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/20 \\\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":"The endpoint returns a valid x402 402 challenge requiring 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/20"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/20"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need instant, keyless API access settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Production workloads requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.171Z"},"updatedAt":"2026-04-25T00:05:11.748Z"}}