{"id":"3c336e1e-7d29-4a03-8853-17bca89d7c59","shortId":"dcqBHv","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories. Each request is paid for individually using USDC on the Base network at $0.02 per call, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/v1/products/39` is listed as \"Premium API Access\" and accepts POST requests settled via x402 with USDC on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform pricing. The platform advertises a broad set of endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/products/39` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" actually provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"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/products/39 is unknown — 'Premium API Access' is not described anywhere","The broad list of endpoints on the homepage cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/39","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/products/39","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 with clear pricing. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific functionality of /api/v1/products/39 ('Premium API Access') is entirely undocumented, making it 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":"2026-04-18T20:04:58.039Z","embedding":[-0.023620605,-0.03414917,0.029693604,0.02330017,0.022705078,-0.0395813,-0.008972168,0.058654785,0.07318115,-0.06304932,0.03289795,-0.062927246,-0.037841797,-0.03414917,-0.024459839,0.025848389,0.00005185604,0.0064849854,-0.0552063,0.03778076,0.019088745,-0.020736694,-0.03048706,0.03765869,0.0063438416,-0.003414154,-0.019805908,0.0009665489,-0.015167236,-0.026947021,0.0390625,-0.02722168,-0.006980896,0.022125244,-0.016403198,-0.014831543,0.001004219,0.04724121,0.037506104,-0.009292603,0.0009899139,-0.06262207,0.0015487671,-0.028381348,-0.052124023,0.0037574768,0.00856781,-0.016967773,-0.002149582,0.0020370483,-0.03161621,-0.011131287,0.002752304,-0.023345947,-0.0017290115,-0.0050201416,-0.0015506744,-0.0037021637,0.0045700073,0.007160187,0.015533447,-0.07861328,-0.012069702,-0.010063171,-0.0036029816,0.050567627,-0.011428833,0.037902832,-0.0057525635,0.06347656,0.02947998,0.029846191,0.034729004,0.012481689,-0.007587433,0.0060691833,-0.007133484,0.06149292,0.0011253357,-0.021347046,-0.03012085,-0.012763977,-0.042999268,-0.0054397583,-0.0099487305,-0.062927246,-0.011062622,0.025131226,-0.037902832,0.031707764,-0.07611084,-0.010650635,-0.013221741,-0.004135132,-0.0015497208,-0.013175964,-0.01777649,0.030517578,-0.011489868,0.020523071,0.012939453,-0.030014038,0.009971619,0.0082473755,0.028961182,0.044830322,0.04196167,0.017074585,-0.00067806244,-0.024398804,-0.039276123,0.0034389496,0.0031738281,-0.00079107285,0.00415802,0.0135269165,-0.0050582886,0.015731812,-0.03253174,0.014579773,-0.046813965,0.044555664,0.007270813,-0.0018167496,0.024414062,-0.023239136,-0.015014648,0.016448975,-0.030700684,-0.016143799,0.024642944,0.004169464,0.0418396,-0.02470398,-0.050598145,0.013618469,-0.024475098,-0.015136719,-0.04611206,-0.02470398,0.021316528,-0.035339355,0.01966858,0.024749756,-0.09765625,-0.029510498,-0.04385376,0.0015039444,-0.03503418,-0.0005836487,0.007820129,0.012756348,-0.017715454,-0.023345947,-0.028671265,-0.017181396,0.004261017,0.039978027,-0.0211792,0.042419434,0.0038070679,0.027526855,0.025558472,-0.00034809113,0.01625061,0.023345947,0.0082473755,-0.085754395,-0.07574463,-0.022140503,0.00006586313,-0.019546509,-0.026290894,-0.002855301,-0.0033550262,-0.072021484,-0.01537323,-0.006702423,-0.016067505,-0.03930664,0.0015516281,-0.035339355,0.0048103333,-0.028396606,-0.06982422,-0.028671265,-0.02281189,0.053863525,0.010879517,0.003255844,0.017944336,-0.027877808,0.062683105,0.021362305,0.004295349,-0.024505615,0.016357422,-0.011146545,0.027526855,0.0004632473,0.017288208,-0.024978638,0.031677246,0.058654785,0.016357422,-0.034240723,-0.005519867,-0.045562744,-0.048553467,-0.03366089,0.023406982,0.0053253174,0.00040555,0.048919678,-0.026550293,-0.022979736,0.007675171,0.020431519,0.015205383,0.07489014,0.00026464462,-0.003145218,0.01725769,0.012870789,-0.04031372,0.04446411,0.043395996,0.008804321,-0.0033740997,-0.033691406,0.023208618,0.035247803,-0.025436401,0.012519836,-0.014335632,0.02230835,-0.0017271042,0.010887146,0.01586914,-0.019317627,-0.011917114,-0.03845215,-0.01864624,0.025039673,0.0035438538,-0.0368042,-0.040283203,-0.090270996,0.03579712,0.030334473,0.048461914,0.007167816,0.023132324,-0.022567749,-0.0064888,-0.08325195,0.047821045,0.060699463,-0.008850098,-0.02218628,0.00982666,-0.0138549805,-0.035003662,-0.0060424805,-0.011779785,-0.031341553,-0.013496399,0.022872925,-0.04916382,0.0005106926,0.020523071,0.023864746,0.053588867,-0.00019598007,-0.04562378,-0.035186768,-0.0043792725,0.005214691,-0.022537231,0.0030841827,-0.0024337769,0.020629883,0.0078048706,-0.014289856,0.029190063,-0.0016527176,0.016296387,-0.0008983612,-0.018539429,-0.005519867,-0.012237549,0.01687622,0.013465881,-0.06567383,0.006290436,-0.012893677,0.07092285,-0.049713135,0.04534912,-0.009223938,0.032409668,0.059387207,-0.0032920837,-0.049072266,-0.002281189,0.02848816,0.027267456,0.02810669,0.012763977,-0.03781128,-0.0054893494,0.07696533,-0.005569458,-0.007331848,0.025817871,-0.0008234978,0.03555298,-0.01612854,-0.07116699,-0.018173218,-0.0012569427,-0.043182373,0.029266357,-0.010475159,0.016723633,-0.030334473,-0.0062408447,-0.025741577,0.0042304993,-0.034301758,0.0034217834,-0.03842163,-0.0021820068,-0.015411377,-0.017150879,0.011184692,0.019302368,-0.008712769,0.012550354,0.027297974,0.021499634,-0.016937256,-0.036895752,-0.023284912,-0.008224487,-0.0031337738,0.018096924,0.018356323,0.018554688,0.03753662,-0.029937744,0.0033950806,0.031982422,0.016464233,0.039611816,-0.00081920624,-0.012237549,-0.054107666,-0.05178833,-0.028793335,-0.041748047,0.021911621,0.032989502,-0.00793457,0.04977417,-0.0029125214,-0.0062408447,-0.045288086,0.01448822,-0.034729004,-0.0018177032,0.044311523,-0.009994507,-0.041900635,-0.0070533752,-0.006629944,-0.00018537045,0.031433105,0.012741089,0.02571106,0.0692749,0.046844482,0.00079774857,0.02255249,-0.0017604828,0.018981934,0.011497498,-0.020629883,-0.031341553,-0.014793396,0.027633667,-0.014122009,-0.011817932,-0.066467285,0.05758667,0.016571045,0.0758667,0.02532959,0.015083313,0.045288086,-0.0049858093,0.0143585205,-0.01638794,-0.008605957,-0.014717102,-0.042297363,0.038726807,-0.00894928,-0.005870819,-0.030532837,0.036010742,-0.012382507,0.027801514,-0.03439331,0.037506104,0.014953613,-0.014083862,0.02911377,0.020812988,0.05947876,0.05380249,-0.043182373,0.01890564,0.037078857,-0.035888672,0.0021591187,0.034240723,-0.018539429,-0.015609741,-0.043518066,-0.023712158,-0.0034484863,0.004310608,-0.044036865,-0.00065612793,-0.0020980835,-0.0059547424,0.039855957,-0.01626587,-0.019714355,-0.0050354004,-0.012542725,-0.060028076,-0.013221741,-0.03857422,0.011909485,0.031555176,-0.033081055,-0.019607544,-0.0013923645,-0.010925293,-0.015960693,0.007904053,0.014045715,0.007888794,-0.03604126,0.036193848,0.01071167,0.0069770813,0.015556335,0.019851685,0.03555298,0.020904541,0.043182373,0.010757446,-0.018814087,-0.056915283,0.015556335,-0.033843994,0.005744934,0.013954163,-0.029159546,-0.0022144318,-0.019317627,-0.037506104,-0.015068054,-0.0071525574,-0.025314331,0.0103302,0.031402588,-0.027450562,-0.03387451,-0.05807495,-0.009666443,-0.018844604,0.081970215,0.014678955,-0.002067566,-0.06945801,-0.015098572,0.011505127,0.011077881,0.021072388,-0.014862061,-0.0098724365,-0.008415222,-0.02128601,-0.016830444,-0.032104492,0.02810669,-0.013557434,-0.018661499,0.034729004,0.0012702942,0.03048706,-0.012641907,0.021011353,0.026992798,-0.014678955,-0.0017747879,-0.01966858,0.039916992,0.0051574707,-0.0061531067,-0.051727295,0.051330566,0.00674057,0.03463745,-0.037628174,-0.0040779114,-0.011772156,0.013504028,0.01134491,0.003955841,-0.011894226,-0.010124207,-0.052978516,-0.066223145,0.025482178,-0.024215698,0.03289795,0.022491455,-0.002670288,0.030410767,-0.014793396,0.0010328293,0.029144287,-0.027664185,-0.0070152283,-0.020446777,-0.03125,-0.018218994,-0.0063552856,-0.02835083,0.017440796,-0.02407837,0.015853882,-0.0041046143,-0.022155762,0.019699097,0.006095886,-0.003200531,0.022399902,-0.0036125183,0.03173828,0.042022705,0.00356102,-0.04586792,0.029006958,-0.0051574707,0.018493652,-0.017303467,0.042907715,0.039276123,0.0021915436,-0.003314972,-0.013069153,-0.012741089,-0.028778076,0.003692627,-0.007972717,0.012863159,-0.004459381,-0.036071777,0.016708374,0.0045204163,-0.01940918,-0.042999268,0.010848999,0.023742676,-0.029220581,0.009231567,0.015602112,0.04309082,-0.036621094,-0.006000519,0.022369385,0.020553589,0.03262329,0.0110321045,-0.020492554,0.013580322,-0.0063095093,0.0095825195,-0.005050659,-0.014251709,0.032440186,-0.0025691986,0.0151901245,0.012908936,0.0043258667,-0.01448822,-0.025299072,-0.0010051727,-0.015670776,-0.01499176,0.024307251,0.021606445,0.031097412,-0.027816772,0.018478394,0.020339966,-0.02355957,-0.011688232,-0.012641907,0.029647827,-0.0064582825,-0.011581421,0.011039734,0.008659363,0.032684326,-0.059448242,-0.002910614,0.001701355,0.0116119385,-0.016540527,-0.03793335,-0.048553467,0.013671875,0.041046143,0.014030457,0.017242432,0.04147339,0.0053138733,0.012077332,0.029266357,0.007896423,-0.020706177,-0.024414062,-0.033050537,-0.014289856,0.009010315,-0.00085783005,-0.02558899,0.021759033,-0.021209717,-0.024795532,0.019058228,-0.013076782,-0.0010900497,-0.0021457672,0.010017395,0.035614014,-0.0025424957,0.016571045,-0.0036201477,-0.037475586,-0.0076026917,0.0048561096,0.0074043274,-0.050811768,0.011383057,-0.010749817,-0.0056037903,0.0003311634,0.0073051453,0.023864746,0.014572144,0.015625,0.027999878,-0.052703857,0.027877808,-0.037231445,0.012832642,0.012542725,-0.037872314,-0.012367249,-0.031066895,-0.021514893,0.04244995,-0.021499634,-0.013175964,-0.024429321,-0.033233643,-0.02381897,-0.052215576,0.021392822,0.045440674,0.037322998,-0.021591187,0.00046777725,0.009246826,-0.0018672943,-0.010513306,0.004322052,-0.02394104,0.033477783,0.016403198,-0.0030384064,-0.03274536,-0.018875122,-0.024871826,0.009284973,-0.032165527,-0.055755615,-0.00856781,0.0017223358,-0.015098572,-0.0005235672,-0.024154663,-0.022323608,0.0034713745,-0.034057617,0.0146102905,0.019363403,0.018112183,0.009963989,-0.02192688,0.005180359,0.019104004,-0.01486969,0.04434204,-0.0048332214,-0.0024757385,-0.047698975,0.019958496,0.030853271,0.029449463,-0.0030517578,-0.009849548,-0.0017786026,-0.015083313,-0.0541687,0.00030708313,-0.003484726,-0.005809784,-0.00029349327,-0.000003695488,-0.053985596,-0.010528564,-0.02330017,0.0018606186,0.02279663,0.03149414,0.003326416,0.0014076233,0.0003066063,0.005970001,-0.0012493134,-0.02947998,0.03326416,0.011047363,-0.0049934387,0.024307251,0.054595947,0.004962921,-0.021102905,0.0019702911,0.0016832352,0.0262146,-0.019165039,0.013092041,-0.0149383545,0.017654419,-0.014228821,-0.019302368,-0.034240723,0.0028629303,0.08508301,0.009223938,0.0075950623,-0.02180481,-0.02658081,0.010536194,0.018157959,-0.050964355,-0.002023697,-0.028198242,0.0209198,-0.02458191,0.0126571655,0.021621704,0.026123047,-0.023284912,-0.04812622,-0.021606445,-0.008125305,0.00015628338,-0.07446289,-0.023880005,-0.064086914,-0.0027122498,-0.025497437,-0.017059326,-0.0004284382,-0.0007658005,-0.023849487,-0.08288574,0.009101868,0.04724121,-0.0015068054,0.027709961,-0.011627197,0.017440796,0.026397705,-0.031341553,-0.002412796,0.035369873,-0.023452759,-0.028823853,-0.02519226,0.0149002075,-0.000013947487,-0.008590698,0.0057907104,0.0065307617,0.021942139,0.00057172775,0.009262085,-0.0061683655,0.020690918,-0.02027893,0.012191772,-0.012962341,-0.014282227,0.036132812,-0.04510498,0.01663208,0.013961792,-0.019515991,0.0048217773,0.022537231,0.032989502,-0.029907227,-0.015602112,0.019943237,0.009048462,0.039764404,-0.020446777,0.04611206,0.0045928955,-0.023147583,0.020767212,-0.0107421875,-0.016143799,-0.029830933,-0.03213501,0.028503418,-0.004058838,0.0037021637,-0.02217102,0.008979797,0.011856079,-0.003194809,-0.0033092499,-0.0055236816,-0.020233154,-0.01828003,-0.0049438477,-0.0070533752,-0.017913818,0.0027427673,0.021255493,0.021560669,0.030090332,-0.002521515,-0.0069084167,0.00982666,0.036712646,-0.0105896,-0.010215759,0.01576233,0.001156807,0.027404785,0.009643555,0.021591187,-0.04638672,-0.001958847,-0.033691406,-0.0104904175,0.008758545,0.0009403229,-0.0033130646,-0.000998497,-0.001876831,0.003824234,-0.03387451,0.0035896301,-0.030807495,-0.039642334,-0.0061454773,-0.02230835,0.024963379,0.007205963,0.006668091,0.0060768127,0.0015554428,0.037384033,0.011421204,-0.0016088486,0.02810669,0.03201294,0.01979065,-0.023254395,-0.008140564,-0.011665344,0.0046958923,0.0051574707,-0.031921387,0.00982666,0.049835205,-0.017318726,0.008758545,0.011672974,0.026870728,-0.013465881,0.004589081,-0.004081726,0.017166138,-0.0016813278,0.03387451,-0.044189453,0.014289856,0.026916504,-0.0018177032,-0.010475159,-0.013633728,-0.022338867,0.021133423,-0.002248764,-0.0043296814,0.050750732,0.009895325,0.03125,-0.022216797,-0.018234253,0.008071899,-0.0206604,-0.02130127,0.008300781,-0.0033035278,-0.009132385,0.01838684,-0.033843994,0.04144287,-0.048950195,0.020431519,0.010948181,0.0028934479,-0.009117126,-0.002456665,-0.006084442,0.008666992,-0.019973755,0.0004553795,-0.004611969,0.04937744,-0.002948761,0.03012085,0.05886841,0.008056641,-0.001499176,-0.03466797,-0.020706177,-0.013130188,-0.008415222,0.021408081,-0.019821167,0.05532837,0.034362793,-0.007457733,0.03717041,0.0209198,0.025115967,0.003232956,0.018463135,-0.0062942505,0.01084137,-0.0113220215,0.019638062,0.0054893494,0.03717041,-0.033935547,0.033813477,0.010772705,0.0368042,-0.030929565,0.029510498,0.06085205,0.03213501,-0.008857727,0.055908203,0.0034751892,-0.017318726,-0.01727295,-0.012397766,0.051635742,0.008712769,0.036621094,0.046691895,0.00031661987,0.0018424988,0.015945435,-0.03579712,-0.023925781,0.0670166,0.026473999,-0.018539429,-0.0074043274,0.0065994263,0.005191803,-0.03741455,-0.02407837,0.03366089,-0.0034999847,0.004852295,-0.02017212,-0.013702393,-0.018920898,0.0057296753,0.021362305,0.0073242188,-0.007534027,0.026870728,0.03253174,0.011520386,0.030303955,0.004875183,0.024414062,-0.03564453,-0.017807007,0.01965332,0.011650085,-0.010650635,-0.016220093,0.02168274,0.019088745,0.050231934,0.04675293,-0.024017334,0.0028495789,0.030029297,0.007659912,-0.011764526,0.050628662,0.031066895,0.011474609,0.043914795,0.03604126,0.026763916,-0.036254883,0.008857727,0.0105896,0.0036125183,-0.020721436,-0.01751709,0.0040893555,-0.011482239,0.020370483,-0.0067825317,-0.012741089,0.022857666,0.027664185,0.009254456,-0.00548172,-0.012176514,0.022872925,-0.015930176,-0.00340271,0.017868042,-0.0096588135,0.03805542,0.016098022,0.02381897,-0.017745972,0.021102905,-0.0082473755,-0.0077934265,-0.006591797,0.018676758,-0.043060303,0.017288208,-0.009521484,-0.0022888184,-0.052368164,0.015388489,0.029449463,-0.0022354126,0.023712158,0.012016296,-0.0012407303,0.008171082,0.033935547,0.0101623535,0.0044555664,-0.0061035156,-0.014434814,0.012069702,0.040527344,-0.0008611679,0.008506775,-0.024627686,-0.008392334,0.005207062,-0.01991272,-0.003982544,-0.0056419373,-0.010543823,-0.028503418,0.014015198,0.033050537,0.027557373,0.049865723,-0.0076675415,-0.0031871796,0.009407043,0.029846191,0.01902771,0.00724411,0.0000076293945,0.019226074,-0.013206482,0.04562378,0.02619934,0.01008606,0.031066895,-0.019958496,-0.014122009,0.014755249,-0.006111145,0.029937744,-0.017456055,0.00082445145,-0.006374359,0.02381897,-0.023422241,-0.035339355,0.0053596497,-0.025772095,-0.022491455,-0.028747559,0.00919342,0.009269714,0.020477295,0.05230713,0.024871826,-0.019088745,0.060760498,-0.030136108,0.046539307,-0.010513306,-0.008018494,0.047973633,0.02508545,0.03062439,0.021621704,0.019927979,-0.03665161,0.0104904175,0.03640747,0.03503418,-0.004550934,-0.007659912,-0.022277832,0.0395813,-0.008659363,0.02293396,0.0060691833,-0.008262634,0.008766174,-0.011070251,-0.01033783,-0.007217407,-0.008102417,0.0051727295,0.044158936,-0.02545166,-0.002702713,-0.023498535,-0.018600464,0.022735596,-0.009727478,0.004676819,-0.001083374,-0.030029297,0.016220093,-0.03717041,-0.016357422,0.001159668,0.024429321,-0.048980713,-0.0018539429,0.010787964,0.01751709,-0.020370483,0.03164673,0.019470215,-0.0029258728,0.00579834,0.044067383,-0.010787964,0.026733398,-0.012863159,0.037231445,0.038238525,-0.0047302246,-0.017700195,0.01108551,0.0075683594,-0.013137817,0.01687622,0.024917603,-0.01939392,0.0036945343,-0.004573822,-0.001124382,-0.0017108917,0.009437561,-0.00037240982,0.013511658,-0.014434814,-0.008171082,0.01512146,0.011764526,-0.000083208084,0.0026741028,-0.007896423,-0.010604858,0.019561768,0.042419434,0.010894775,-0.035186768,0.0025959015,-0.007888794,0.009689331,-0.019073486,-0.018600464,-0.00356102,-0.03173828,0.0060920715,0.017333984,0.005970001,0.0079956055,-0.024551392,-0.0030574799,0.030197144,0.012512207,0.019699097,-0.0007009506,-0.0030727386,0.0138549805,-0.026260376,-0.017730713,-0.003829956,0.0031204224,0.010620117,0.017410278,-0.0038280487,-0.026687622,0.02633667,0.011352539,0.017944336,0.0016765594,-0.027023315,0.027450562,-0.023635864,-0.017807007,0.007865906,0.009399414,-0.012191772,-0.0066375732,-0.012771606,0.045166016,0.058166504,-0.014480591,-0.009414673,0.020095825,0.0070152283,0.019073486,0.040008545,-0.011764526,0.05102539,0.023223877,-0.026031494,-0.021316528,0.024047852,-0.0059432983,-0.024658203,0.007385254,0.005897522,-0.0060653687,0.011039734,0.013183594,0.0017700195,-0.023956299,-0.022781372,-0.008621216,-0.0045928955,0.027160645,-0.00856781,0.0067977905,-0.010215759,-0.0030097961,0.0030879974,-0.022399902,-0.044921875,-0.022888184,-0.003753662,-0.0141067505,-0.057800293,0.0025939941,-0.028396606,-0.004825592,-0.009140015,-0.008811951,-0.008735657,0.023544312,-0.012794495,0.0065078735,0.013320923,0.02381897,0.020996094,-0.00079345703,0.022827148,-0.028427124,-0.032409668,-0.030563354,-0.0020198822,-0.013725281,0.026657104,0.0015983582,0.029510498,0.023895264,0.0044174194,-0.0067443848,-0.013793945,-0.0036811829,-0.012397766,-0.008224487,-0.012268066,0.028503418,0.0071792603,-0.008377075,-0.010169983,0.03503418,-0.030197144,-0.0038204193,0.015258789,0.050048828,0.010116577,0.046142578,-0.019073486,-0.009971619,-0.015151978,0.005683899,-0.021270752,0.0042304993,0.014373779,0.0046691895,-0.0096206665,0.002779007,0.02217102,0.0054244995,0.00472641,0.036346436,0.00095176697,-0.0046806335,0.03894043,0.0074882507,0.0033130646,-0.011146545,-0.023208618,0.026885986,0.039245605,0.009757996,0.012512207,0.0030918121,0.009437561,-0.0184021,0.010269165,0.009147644,-0.0075683594,-0.039489746,-0.022628784,-0.035461426,0.031707764,-0.0064811707,0.011199951,-0.011909485,0.01171875,-0.0101623535,-0.032958984,-0.024993896,0.022964478,0.02017212,-0.010566711,-0.01852417,-0.0017061234,0.019973755,-0.03488159,-0.0044403076,-0.048706055,-0.035461426,-0.0071792603,-0.02142334,0.022949219,0.006198883,-0.021957397,-0.0027427673,-0.009674072,-0.0045051575,0.003063202,0.03286743,-0.0012865067,-0.0015134811,0.028030396,0.02468872,-0.01789856,0.013885498,-0.012992859,0.00055742264,0.00919342,-0.00982666,0.018951416,-0.009361267,0.027801514,-0.0028057098,-0.012298584,0.032806396,0.0005378723,0.020431519,-0.02079773,0.004135132,-0.004272461,-0.010314941,0.038208008,-0.028503418,-0.018188477,0.0101623535,-0.015319824,-0.020202637,-0.0004208088,0.025009155,0.022598267,-0.012741089,0.04119873,-0.014434814,-0.016281128,0.02583313,0.014083862,-0.007835388,0.008232117,0.051605225,0.0050239563,-0.010261536,0.0073242188,-0.013320923,-0.014793396,-0.005332947,0.01537323,-0.0035800934,-0.01374054,0.026519775,0.001367569,0.04333496,-0.009941101,0.011802673,0.009513855,-0.006263733,0.021591187,0.013793945,0.042297363,-0.0055999756,-0.0178833,0.01737976,0.010261536,-0.026290894,0.004081726,-0.0021896362,-0.0035133362,-0.034240723,0.028533936,-0.0047798157,0.026321411,-0.02684021,0.014556885,-0.020812988,0.0053634644,-0.028671265,0.0074424744,-0.032318115,0.010017395,0.043182373,0.014633179,0.02468872,0.0026016235,-0.019821167,0.018035889,0.06750488,-0.009208679,-0.030593872,-0.0082473755,0.026397705,-0.0046539307,0.014144897,0.0033187866,-0.023361206,-0.030670166,0.00088119507,-0.009681702,0.007507324,0.00012052059,0.030960083,0.016220093,0.0015392303,0.0023040771,0.024047852,-0.0038146973,0.000052273273,0.00712204,0.013076782,0.024246216,0.023864746,-0.01171875,0.028533936,0.0131073,-0.048583984,0.064697266,0.0019083023,0.025161743,-0.022338867,0.008216858,-0.037078857,-0.013847351,-0.021499634,0.0051841736],"createdAt":"2026-04-18T18:32:25.539Z","updatedAt":"2026-04-23T22:01:42.760Z","lastSeenAt":"2026-04-23T22:01:42.760Z","tsv":"'/api/v1/products/39':87,201 '/request':12,28 '0.02':11,27,71,122,161 '000':113 '20':112 '402':212 '6':118 'Base network API' 'USDC API' 'accept':95 'access':93,226 'across':47 'actual':227 'advertis':108,134 'ai':50 'analysi':142 'analyt':49 'api':5,14,21,30,39,76,92,170,225 'base':8,24,68,104,114 'base-network' 'broad':136 'call':4,20,73 'categori':57 'challeng':107,213 'classif':145 'connect':179 'consist':125 'content':185 'convers':153 'data':48,155,221 'decim':119 'descript':197 'detail':196 'doc':169 'document':164,216 'embed':146 'enabl':38 'endpoint':46,85,139,202,206 'equal':121 'exampl':193 'exchang':149 'export':156 'extrem':166 'feed':148 'financ':53 'function':223 'geocod':151 'http-post' 'includ':140 'individu':63 'infrastructur':56 'key':15,31,77 'learn':52 'limit':79 'list':89 'live':208 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':51 'marketplac':40 'maxamountrequir':110 'micropayment API' 'network':69 'no-api-key' 'offer':42 'openapi':189 'page':174 'paid':61 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'per':3,19,72,123 'platform':6,22,133 'point':163 'post':96 'premium':91,224 'premium API access' 'price':131,147,162,171 'prompt':181 'provid':228 'rate':78,150 'readm':173 'render':176 'request':59,97,124 'request/response':192 'requir':16,32,82 'return':204,209 'schema':190 'sentiment':141 'set':137 'settl':98 'site':128 'spars':167 'specif':84,203 'subscript':81 'summar':144 'text':143 'unclear':219 'uniform':130 'unit':115 'usdc':65,102,117 'usdc-settlement' 'use':64 'valid':152,211 'varieti':44 'via':9,25,99 'wallet':180 'web3':54 'without':215 'x402':10,26,37,100,106 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"1e98faf3-999b-4bf5-a281-c905c669d4e0","listingId":"3c336e1e-7d29-4a03-8853-17bca89d7c59","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/products/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:25.539Z"}],"sources":[{"listingId":"3c336e1e-7d29-4a03-8853-17bca89d7c59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:25.539Z","lastSeenAt":"2026-04-23T22:01:42.760Z"}],"details":{"listingId":"3c336e1e-7d29-4a03-8853-17bca89d7c59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/39 \\\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 site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/products/39"},{"claim":"The endpoint is described as 'Premium API Access' in the x402 challenge","source_url":"https://lowpaymentfee.com/api/v1/products/39"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to various API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Accessing data, analytics, AI inference, or utility endpoints with per-request billing"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access on Base","Use cases requiring no upfront commitment or rate-limit-free access","Crypto-native applications that can settle payments in USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.761Z"},"updatedAt":"2026-04-23T22:01:42.760Z"}}