{"id":"65639b6d-687f-4be6-951d-af5b6dad46bd","shortId":"8FyJDb","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/44` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four endpoint 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 listed endpoints share the same $0.02 per-request pricing.\n\nThe `/api/v1/keys/44` endpoint itself is live and returns a proper 402 challenge with x402 version 1. However, the actual functionality behind this specific path (\"Premium API Access\") is not documented beyond its title — there is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The broader site's /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-gateway","ai","finance","data"],"synonyms":["low payment fee","micropayment API","pay-per-call API","x402 API","USDC API","Base network API","micro-transaction endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific purpose of /api/v1/keys/44 ('Premium API Access') is unclear — it may be a generic key or access token endpoint","Site documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'","No request or response examples are available; callers must discover behavior empirically"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/44","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/keys/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a title. The specific functionality of /api/v1/keys/44 ('Premium API Access') is entirely undocumented. Most site pages returned only 'Connect wallet' with no content.","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":"2026-04-21T22:24:55.476Z","embedding":[-0.010017395,-0.02772522,0.043945312,0.01727295,0.020751953,-0.032714844,-0.026367188,0.04107666,0.06542969,-0.0657959,0.0390625,-0.05596924,-0.020385742,-0.032440186,-0.028442383,0.006511688,-0.0072746277,0.009536743,-0.04269409,0.03439331,0.018295288,-0.029464722,-0.013648987,0.02053833,0.0022563934,-0.014701843,-0.007095337,-0.030151367,-0.013900757,-0.03201294,0.051513672,-0.023147583,-0.012954712,0.010322571,-0.017684937,-0.014350891,0.00055360794,0.023971558,0.030960083,-0.0050735474,-0.0073127747,-0.06555176,0.00793457,-0.011192322,-0.043304443,-0.01083374,0.009887695,-0.020568848,0.0035800934,-0.0074768066,-0.035583496,-0.008407593,-0.010681152,0.0062828064,0.0045776367,0.015151978,-0.009124756,-0.019195557,0.020828247,0.0025901794,0.011291504,-0.05239868,-0.022262573,0.0026359558,0.0029239655,0.05419922,-0.019104004,0.050598145,0.009132385,0.058807373,0.031829834,0.042541504,0.02218628,0.01309967,-0.00566864,-0.0004131794,-0.015975952,0.06124878,-0.00712204,-0.017547607,-0.016525269,-0.0033931732,-0.039245605,-0.00030946732,-0.012489319,-0.049072266,-0.025650024,0.013877869,-0.020126343,0.029968262,-0.06762695,-0.028930664,-0.009788513,0.0073776245,0.010002136,-0.0020580292,-0.0073394775,0.021102905,-0.01828003,0.02406311,-0.0028514862,-0.038269043,0.01828003,0.020217896,0.04421997,0.049224854,0.014389038,0.018661499,0.0048713684,-0.024597168,-0.060028076,-0.0014314651,-0.022949219,-0.020889282,0.019012451,0.004714966,-0.014282227,0.009147644,-0.03366089,-0.0015306473,-0.05819702,0.05117798,0.028015137,0.004524231,0.003665924,-0.049713135,-0.018814087,0.003282547,-0.023513794,-0.03262329,0.003025055,0.015266418,0.021209717,-0.014549255,-0.036499023,0.016067505,-0.009506226,-0.02281189,-0.04257202,-0.03463745,0.024642944,-0.027862549,0.031097412,0.032684326,-0.10870361,-0.012413025,-0.042877197,0.00440979,-0.025421143,-0.003780365,-0.0001552105,0.020339966,-0.010543823,-0.016098022,-0.012336731,-0.01927185,0.0070762634,0.027145386,-0.018493652,0.047088623,-0.01272583,0.040283203,0.019866943,0.00605011,0.021102905,0.02911377,0.010650635,-0.080200195,-0.08483887,-0.023727417,-0.007331848,-0.026855469,-0.022094727,0.015853882,-0.016464233,-0.06311035,-0.013000488,-0.012214661,-0.006351471,-0.037963867,-0.017044067,-0.016296387,0.015571594,-0.010047913,-0.0463562,-0.0070610046,-0.019485474,0.062072754,0.009407043,0.021270752,0.023666382,-0.012359619,0.06768799,0.030044556,-0.021316528,-0.01576233,0.004295349,-0.027114868,0.026992798,-0.0042419434,0.0013923645,-0.041992188,0.0435791,0.057769775,0.019699097,-0.015411377,-0.022521973,-0.052734375,-0.0368042,-0.040893555,0.026229858,0.01600647,0.015266418,0.04925537,-0.04727173,-0.025039673,-0.004890442,0.011932373,0.01361084,0.07702637,0.0038146973,-0.012634277,0.019104004,0.02154541,-0.04901123,0.03604126,0.029327393,0.009979248,-0.026321411,-0.013969421,0.03100586,0.038604736,-0.01675415,0.0040016174,-0.029968262,0.026855469,-0.0061187744,-0.004863739,0.01890564,-0.02017212,-0.01676941,-0.03277588,-0.03378296,0.03062439,-0.0018787384,-0.019104004,-0.024429321,-0.08325195,0.050079346,0.02255249,0.047912598,-0.01436615,0.016296387,-0.018417358,-0.002023697,-0.0635376,0.05545044,0.074645996,0.010009766,-0.024902344,0.020812988,-0.00856781,-0.02835083,0.0046920776,-0.01386261,-0.046295166,-0.017318726,0.019119263,-0.05419922,-0.012954712,0.02357483,0.028305054,0.057647705,-0.012481689,-0.03289795,-0.02078247,-0.0041542053,-0.0068244934,-0.030349731,0.001253128,-0.002105713,0.0010738373,0.03173828,-0.0126953125,0.012062073,-0.005180359,0.00491333,0.00207901,-0.008598328,-0.022781372,-0.021408081,0.021560669,0.008979797,-0.05923462,0.005241394,-0.0035705566,0.06921387,-0.033691406,0.041168213,-0.009025574,0.017669678,0.04168701,-0.0023498535,-0.04714966,0.006126404,0.027862549,0.026687622,0.047912598,0.007183075,-0.029464722,-0.005115509,0.07946777,-0.0073127747,-0.006099701,0.0040245056,0.0012712479,0.032440186,-0.027572632,-0.05819702,-0.02607727,-0.003929138,-0.03451538,0.015625,-0.01701355,0.020355225,-0.0033054352,0.0046577454,-0.01436615,0.016433716,-0.029800415,0.0317688,-0.034118652,0.0059051514,-0.012710571,-0.03756714,0.007850647,0.015113831,-0.010398865,-0.0058555603,0.033813477,0.021865845,-0.01890564,-0.035217285,-0.022583008,-0.009986877,-0.009162903,0.01725769,0.01373291,0.021957397,0.04360962,-0.01512146,0.0028972626,0.029937744,0.029693604,0.031341553,-0.012336731,0.0055503845,-0.0657959,-0.047576904,-0.026779175,-0.030639648,0.028045654,0.029693604,-0.005558014,0.05105591,0.002790451,-0.0259552,-0.049072266,0.030227661,-0.036010742,-0.0063705444,0.037139893,-0.014678955,-0.041748047,-0.0006623268,-0.0021343231,0.0046577454,0.039001465,0.016952515,0.020721436,0.07305908,0.048431396,-0.00472641,0.023361206,0.0030097961,0.031463623,0.022201538,-0.022918701,-0.03527832,0.0046920776,0.029434204,-0.018493652,-0.024719238,-0.07836914,0.072387695,0.041137695,0.07116699,0.014007568,0.019500732,0.045684814,-0.021942139,0.022216797,-0.020812988,-0.010314941,-0.0113220215,-0.03930664,0.04525757,-0.01361084,0.003238678,-0.03265381,0.05331421,-0.0019721985,0.026519775,-0.032470703,0.044677734,-0.0035381317,0.0014476776,0.013839722,0.004722595,0.04727173,0.07122803,-0.0519104,0.012962341,0.026046753,-0.028930664,0.01184082,0.049713135,-0.0042152405,-0.0074043274,-0.07208252,-0.022506714,-0.004825592,-0.005065918,-0.049926758,-0.0025119781,0.009315491,0.0072669983,0.03286743,-0.025634766,-0.02130127,-0.013496399,-0.030059814,-0.059387207,0.0020713806,-0.055603027,-0.005168915,0.037994385,-0.039276123,-0.02204895,0.0057525635,-0.017166138,-0.012123108,0.0036334991,0.03074646,-0.0013904572,-0.04019165,0.03225708,0.001247406,0.0054626465,-0.0015907288,0.024536133,0.018051147,0.020904541,0.057403564,0.014427185,-0.018112183,-0.068359375,0.02507019,-0.051940918,0.0015535355,0.015930176,-0.03062439,-0.0019569397,-0.0051841736,-0.036743164,-0.02520752,0.009254456,-0.038513184,-0.0004911423,0.016555786,-0.032073975,-0.022247314,-0.064575195,-0.009109497,-0.0058555603,0.07281494,0.021636963,-0.007194519,-0.04638672,0.0035877228,0.00020492077,0.0011119843,0.046569824,-0.014732361,-0.011222839,-0.003768921,-0.018722534,-0.010597229,-0.03250122,0.02986145,-0.008674622,-0.010917664,0.019500732,0.016479492,0.0077590942,0.013496399,0.009483337,0.019485474,-0.029220581,-0.013847351,-0.012168884,0.037353516,0.0043563843,-0.0017576218,-0.039031982,0.039520264,0.024627686,0.03390503,-0.030166626,-0.014190674,-0.01058197,0.0052757263,0.0149383545,-0.013938904,-0.017074585,-0.008964539,-0.056762695,-0.06738281,0.038513184,-0.0231781,0.03353882,0.013320923,0.005718231,0.019210815,-0.014465332,0.008148193,0.028121948,-0.026473999,-0.006538391,-0.023406982,-0.03363037,-0.019851685,0.0061035156,-0.022583008,0.021194458,-0.016708374,0.006298065,-0.002960205,-0.025009155,0.018951416,0.019577026,-0.0129470825,0.01928711,0.008270264,0.025543213,0.047912598,0.0065078735,-0.051330566,0.029037476,-0.0006008148,0.014732361,-0.001783371,0.042785645,0.03491211,-0.014167786,-0.010025024,0.0029716492,-0.014915466,-0.011627197,0.0012397766,0.007843018,0.014205933,-0.014442444,-0.051971436,0.007621765,0.014175415,-0.02758789,-0.015716553,0.026870728,0.016159058,-0.032043457,0.023132324,0.015136719,0.052642822,-0.030044556,0.004322052,0.008888245,0.030822754,0.025939941,0.0019168854,-0.0018825531,0.01802063,-0.018249512,0.006729126,-0.01828003,0.010223389,0.022628784,-0.0007557869,0.01751709,0.021240234,0.018463135,-0.025970459,-0.031204224,0.007068634,-0.019638062,-0.020477295,0.017684937,0.02696228,0.019714355,-0.02720642,0.019012451,0.008728027,-0.021636963,0.00014650822,-0.008262634,0.035949707,-0.012886047,-0.01374054,0.019256592,-0.0020370483,0.023025513,-0.04031372,-0.009101868,0.006298065,0.0181427,-0.036193848,-0.050201416,-0.04119873,0.007965088,0.04019165,0.008384705,0.027359009,0.03744507,0.004611969,0.006652832,0.023956299,0.0038414001,-0.024475098,-0.0051956177,-0.03378296,-0.02041626,-0.004623413,0.0029773712,-0.029647827,0.013442993,-0.010223389,-0.028823853,0.010398865,-0.007648468,-0.0073928833,-0.004676819,0.0057525635,0.036956787,0.014266968,0.018356323,-0.012397766,-0.027389526,0.0005583763,0.0014438629,0.017227173,-0.045166016,0.021209717,-0.013137817,-0.020690918,-0.0035076141,0.00894928,0.021392822,0.028625488,0.0093307495,0.0289917,-0.062683105,0.05529785,-0.04095459,0.022460938,-0.0004892349,-0.03866577,-0.002527237,-0.028060913,-0.027542114,0.039733887,-0.020553589,-0.00894165,-0.033813477,-0.02407837,-0.009552002,-0.051208496,0.02532959,0.047973633,0.042297363,-0.027648926,-0.0010566711,0.00038218498,0.0010280609,-0.013313293,-0.00053977966,-0.0010957718,0.023513794,0.020019531,-0.002702713,-0.027038574,-0.023147583,-0.013496399,-0.0149383545,-0.03857422,-0.054870605,-0.0023880005,0.014373779,-0.011711121,-0.0068130493,-0.029281616,-0.04095459,-0.0013570786,-0.04269409,-0.0008764267,-0.0065460205,0.0152282715,-0.005142212,-0.021774292,0.015930176,0.023452759,-0.03274536,0.046173096,0.0057754517,0.0049209595,-0.03930664,0.017669678,0.024490356,0.017852783,0.0030593872,-0.011047363,-0.009498596,-0.012771606,-0.04660034,0.00006467104,0.0028018951,-0.010574341,-0.0072021484,-0.003578186,-0.0501709,-0.007675171,-0.022567749,-0.006046295,0.033111572,0.028671265,0.0053749084,-0.0037784576,0.010864258,-0.0062332153,-0.01663208,-0.034210205,0.012687683,0.010932922,-0.002149582,0.026138306,0.046661377,0.011405945,-0.020751953,0.015281677,0.01600647,0.028884888,-0.018966675,0.01222229,-0.018127441,0.008415222,-0.0023765564,-0.017196655,-0.02935791,-0.008605957,0.08544922,0.009719849,-0.011657715,-0.004425049,-0.017852783,0.006099701,0.020889282,-0.057647705,0.009391785,-0.038970947,0.00806427,-0.02355957,0.014572144,-0.003435135,0.011177063,-0.0126953125,-0.04827881,-0.012504578,0.003484726,-0.0082473755,-0.070739746,-0.019607544,-0.0513916,-0.0029144287,-0.010070801,-0.023025513,0.0015230179,-0.0032596588,-0.0154418945,-0.08660889,0.017196655,0.048461914,0.016220093,0.026062012,-0.00484848,0.015022278,0.019805908,-0.026321411,-0.00484848,0.02835083,-0.030593872,-0.019729614,-0.01008606,0.0231781,-0.01373291,-0.010398865,0.0071487427,0.0007224083,0.025939941,0.0026378632,0.012084961,-0.010223389,0.023742676,-0.03894043,0.011772156,-0.003692627,-0.00617218,0.0423584,-0.052337646,0.022949219,0.017288208,0.00088357925,0.009162903,0.027801514,0.04019165,-0.038970947,-0.01713562,0.021911621,-0.0017538071,0.028671265,-0.025939941,0.04763794,0.023040771,-0.01928711,0.022155762,-0.0061035156,-0.013084412,-0.039520264,-0.030853271,0.025390625,0.009613037,0.014549255,-0.021621704,0.011459351,0.03149414,-0.0079574585,0.013214111,-0.014030457,-0.022644043,-0.019943237,-0.0037612915,0.0017604828,0.0043945312,0.0033111572,0.024047852,0.015777588,0.03515625,0.013038635,-0.008728027,0.01751709,0.0184021,-0.019546509,0.0022964478,0.025680542,0.013061523,0.009605408,0.019119263,0.0014429092,-0.044830322,0.0042381287,-0.03262329,-0.03378296,0.010765076,-0.007583618,-0.024337769,-0.011375427,0.014839172,0.00006258488,-0.030059814,0.011024475,-0.0345459,-0.02619934,0.0011196136,-0.015350342,0.02268982,0.012626648,0.007183075,0.0061798096,0.005306244,0.051727295,-0.0014972687,-0.005924225,0.024536133,0.030563354,0.023834229,-0.036499023,-0.0049476624,-0.011245728,0.007095337,0.002658844,-0.039398193,0.015945435,0.03930664,-0.029724121,0.00907135,0.010543823,0.030700684,-0.02859497,-0.00434494,-0.010314941,0.018920898,-0.019302368,0.034057617,-0.043121338,0.021530151,0.007827759,0.0028972626,-0.0149383545,-0.028625488,-0.028671265,0.014701843,-0.0017938614,-0.01902771,0.047454834,-0.00010997057,0.026519775,-0.010063171,-0.020553589,0.0105896,-0.034210205,-0.020385742,0.02758789,-0.0068244934,-0.0012760162,0.015060425,-0.026992798,0.0357666,-0.037872314,0.0054893494,0.015258789,-0.007167816,-0.008049011,-0.0056114197,-0.009933472,0.0052108765,-0.014167786,-0.002910614,0.0019397736,0.05130005,0.021347046,0.036621094,0.05130005,0.006767273,0.00015580654,-0.04019165,-0.011795044,0.0050849915,-0.01473999,0.02456665,-0.005847931,0.042388916,0.03765869,-0.0059013367,0.032196045,0.03994751,0.023162842,-0.0042648315,0.00919342,-0.017456055,0.017837524,-0.0034561157,0.028198242,-0.00021374226,0.04083252,-0.032104492,0.016784668,0.015365601,0.01247406,-0.027328491,0.0418396,0.06323242,0.020843506,-0.010520935,0.027175903,0.0017557144,-0.00793457,-0.016479492,-0.02772522,0.05419922,0.0014724731,0.044433594,0.04748535,0.0022411346,0.001616478,0.013458252,-0.02243042,-0.028015137,0.07287598,0.02218628,-0.012992859,-0.0056037903,-0.007713318,0.008216858,-0.0440979,-0.030014038,0.014587402,-0.012763977,0.0032100677,-0.024673462,-0.004108429,-0.012924194,0.007896423,0.018478394,0.007030487,-0.010559082,0.035369873,0.025482178,0.012054443,0.029251099,-0.0017280579,0.031097412,-0.028167725,-0.034729004,0.011024475,0.01272583,-0.004245758,-0.00712204,0.020187378,0.010612488,0.046539307,0.044708252,-0.013420105,0.012794495,0.03591919,0.014785767,0.005847931,0.050689697,0.034576416,0.009315491,0.03225708,0.035949707,0.039245605,-0.03857422,0.011077881,0.004722595,-0.0053215027,-0.012466431,-0.02507019,-0.0014619827,-0.012420654,0.013557434,-0.0027942657,-0.015029907,0.029251099,0.019180298,-0.0032806396,0.0009946823,0.0017375946,0.0112838745,-0.0068511963,-0.005748749,0.013420105,-0.017669678,0.023330688,0.01828003,0.026992798,-0.022567749,0.022018433,0.001663208,-0.01802063,-0.0072784424,0.023773193,-0.033203125,0.007926941,0.0051841736,-0.0066604614,-0.04864502,0.006801605,0.01890564,0.0018939972,0.03213501,0.019760132,-0.008651733,-0.0027713776,0.005405426,0.004016876,-0.0051002502,-0.013938904,-0.027908325,0.02456665,0.03274536,-0.00077438354,0.019104004,-0.011070251,-0.007987976,0.004760742,-0.009223938,0.0016059875,-0.013305664,-0.018966675,-0.024719238,0.010437012,0.034332275,0.026809692,0.049072266,-0.014625549,-0.012580872,0.010559082,0.030807495,0.0034923553,0.014694214,-0.0011024475,0.022140503,-0.008590698,0.03704834,0.03829956,0.016281128,0.035736084,-0.022094727,-0.013664246,0.014076233,-0.005836487,0.024246216,-0.01739502,0.004688263,-0.005126953,0.026824951,-0.021987915,-0.0368042,0.010925293,-0.019927979,-0.008171082,-0.017974854,0.00630188,0.0020179749,0.025177002,0.04876709,0.028305054,-0.033294678,0.06304932,-0.006134033,0.05444336,-0.0020275116,-0.027359009,0.033477783,0.029541016,0.02558899,0.0060310364,0.020812988,-0.035339355,0.010604858,0.048980713,0.032287598,0.0021038055,0.0014505386,-0.012786865,0.032073975,0.0063095093,0.029006958,-0.00774765,-0.0022354126,0.011131287,-0.0014266968,-0.009719849,-0.0036468506,-0.003850937,-0.0013132095,0.046295166,-0.032073975,-0.019256592,-0.026412964,-0.014045715,0.02571106,-0.011001587,0.0093688965,-0.0075683594,-0.026107788,0.019348145,-0.033935547,-0.019317627,0.0039482117,0.023483276,-0.04284668,-0.017852783,0.004802704,0.024093628,-0.027069092,0.016784668,0.029281616,-0.012199402,0.004585266,0.04244995,-0.014259338,0.031707764,-0.009292603,0.02128601,0.040863037,-0.003534317,-0.021347046,-0.0059318542,0.009101868,-0.017807007,0.022338867,0.033355713,-0.01966858,0.0028038025,0.0030174255,-0.015388489,-0.015083313,-0.006965637,-0.0012512207,-0.0016098022,-0.0048713684,-0.007083893,-0.006549835,0.008323669,0.0062789917,-0.0064353943,-0.015464783,-0.018798828,0.021270752,0.037506104,0.009841919,-0.031341553,-0.011108398,0.009460449,0.010658264,-0.012489319,-0.018676758,-0.016189575,-0.039916992,0.013793945,0.024047852,0.01411438,0.010787964,-0.022979736,-0.003446579,0.01411438,0.00083208084,0.00793457,0.0036144257,-0.019958496,0.0026569366,-0.0104522705,-0.022445679,-0.014099121,-0.016906738,0.012580872,0.027694702,-0.004257202,-0.033599854,0.019485474,-0.007160187,0.01235199,-0.0025787354,-0.016784668,0.023208618,-0.016433716,-0.008781433,-0.0066986084,0.02243042,-0.017868042,-0.012191772,-0.012550354,0.03945923,0.051635742,-0.008361816,-0.016021729,0.022720337,0.016906738,0.019958496,0.0368042,0.013771057,0.04031372,0.025466919,-0.0158844,-0.025482178,0.015007019,-0.0064697266,-0.016021729,0.0067253113,-0.003528595,-0.015853882,0.027832031,0.0043754578,-0.002023697,-0.033477783,-0.015045166,-0.00749588,-0.015045166,0.020599365,-0.0060424805,0.017959595,-0.013786316,-0.011512756,-0.0048217773,-0.013160706,-0.055725098,-0.023010254,0.0031147003,-0.00579834,-0.058654785,0.0066566467,-0.040618896,0.00983429,-0.019805908,-0.009742737,-0.008155823,0.036346436,-0.011238098,0.009559631,-0.004524231,0.023468018,0.024414062,0.0069236755,0.026184082,-0.018295288,-0.022903442,-0.029541016,0.014442444,-0.010734558,0.020324707,0.005039215,0.03552246,0.027328491,0.0025615692,-0.00033140182,-0.007648468,-0.009025574,-0.013420105,-0.02067566,-0.020477295,0.021835327,0.014152527,-0.007621765,-0.013168335,0.03744507,-0.023483276,-0.0013170242,0.022262573,0.051361084,0.007827759,0.03326416,-0.01574707,-0.007610321,-0.0060768127,-0.001364708,-0.015266418,0.015960693,0.01751709,0.013534546,0.0030097961,-0.0033874512,0.006664276,-0.013549805,-0.0034236908,0.023208618,-0.00016355515,-0.010627747,0.03479004,0.021408081,0.010002136,-0.015151978,-0.014953613,0.021987915,0.04522705,0.016311646,0.02053833,0.005264282,0.0096588135,-0.017868042,0.010986328,0.0030956268,-0.021011353,-0.031921387,-0.024139404,-0.026931763,0.021575928,0.008995056,0.006389618,-0.0032463074,0.015319824,-0.016281128,-0.038360596,-0.017074585,0.02796936,0.008613586,-0.009155273,-0.013397217,0.0104599,0.009216309,-0.02633667,-0.004322052,-0.03878784,-0.029205322,0.0005464554,-0.022506714,0.011268616,0.005744934,-0.010948181,0.0016002655,-0.0058937073,0.0037460327,-0.01411438,0.023956299,-0.0149002075,0.011367798,0.012489319,0.01259613,-0.013420105,0.019195557,-0.0042533875,0.0042533875,0.018478394,-0.016326904,0.008132935,-0.022384644,0.03149414,-0.011703491,-0.0063056946,0.04147339,-0.0032749176,0.006652832,-0.035217285,0.002861023,-0.0027599335,0.0013484955,0.042633057,-0.020996094,-0.027862549,0.003124237,-0.021118164,-0.025848389,-0.00063180923,0.02798462,0.032348633,-0.008110046,0.047424316,-0.006702423,0.012191772,0.017990112,0.012939453,-0.013069153,0.0012836456,0.04220581,0.011550903,-0.0021152496,-0.0052223206,-0.007511139,-0.03274536,-0.0074424744,0.023391724,-0.002149582,-0.005012512,0.030044556,0.0038414001,0.03744507,-0.006263733,0.012168884,0.008972168,0.0005187988,0.029220581,-0.002067566,0.04083252,-0.0046844482,-0.03414917,0.0029678345,0.015960693,-0.0234375,0.0056114197,-0.0023040771,-0.0050468445,-0.030410767,0.021499634,-0.0046920776,0.022903442,-0.027618408,0.012321472,-0.016342163,-0.018051147,-0.039367676,-0.015533447,-0.032684326,-0.000060379505,0.038330078,0.0030536652,0.026885986,0.008026123,-0.013465881,0.033050537,0.050201416,0.0038280487,-0.013664246,-0.013717651,-0.00024700165,0.0013246536,0.004322052,0.027908325,-0.028884888,-0.010650635,0.0028133392,-0.024841309,0.009590149,0.00081443787,0.012550354,0.0040740967,-0.009132385,-0.01096344,0.028244019,-0.008308411,-0.00018763542,0.012237549,0.0013170242,0.049743652,0.022918701,-0.0075302124,0.008110046,0.005870819,-0.034729004,0.05493164,-0.0061187744,0.032440186,-0.017288208,0.006793976,-0.04107666,-0.019226074,-0.011680603,0.008071899],"createdAt":"2026-04-21T18:32:23.614Z","updatedAt":"2026-04-22T01:02:18.972Z","lastSeenAt":"2026-04-22T01:02:18.972Z","tsv":"'/api':216 '/api/v1/keys/44':69,163 '/pricing':217 '/readme':219 '/request':19,38 '0.02':18,37,80,157 '000':84 '1':177 '20':83 '402':172 '6':90 'Base network API' 'USDC API' 'access':75,188 'actual':180 'advertis':114 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,74,93,187 'attach':104 'avail':207 'base':8,27,63,85 'base-network' 'behind':182 'beyond':192 'broad':50 'broader':213 'call':4,23,82 'caller':102 'catalog':51 'categori':117 'challeng':173 'classif':132 'classification' 'commit':99 'connect':225 'content':231 'convers':149 'cost':77 'crawl':210 'data':11,30,118,122 'data-analytics' 'decim':91 'detail':205 'document':191,206 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,116,153,164 'estim':143 'exampl':202 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'finance-data' 'four':115 'function':181 'gas':142 'generat':150 'geocod':147 'geocoding' 'header':108 'howev':178 'infrastructur':145 'insight':124 'key':94 'learn':127 'limit':96 'list':71,152 'live':167 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'metric':120 'micro-transaction endpoint' 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':198 'page':211,220 'path':185 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':107 'per':3,22,55,81,159 'per-request':158 'platform':6,25,46,113 'premium':73,186 'price':136,161 'prompt':227 'proper':171 'provid':48 'quot':141 'rate':95,139 'report':121 'request':56,111,160 'request/response':201 'requir':101 'return':169,222 'schema':199 'sentiment':128 'sentiment-analysis' 'settl':58 'share':154 'simpli':103 'site':214 'specif':66,184 'substant':230 'summar':131 'text':130 'text-summarization' 'titl':194 'token':140 'unit':86 'upfront':98 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,146 'utility-apis' 'valid':148 'version':176 'wallet':226 'web3':135 'x402':43,106,175 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2b561713-05bc-4095-9230-cc90dfaad956","listingId":"65639b6d-687f-4be6-951d-af5b6dad46bd","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/keys/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.614Z"}],"sources":[{"listingId":"65639b6d-687f-4be6-951d-af5b6dad46bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.614Z","lastSeenAt":"2026-04-22T01:02:18.972Z"}],"details":{"listingId":"65639b6d-687f-4be6-951d-af5b6dad46bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/44 \\\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 402 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/keys/44"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/44"}],"useCases":["Agents needing on-demand API access without subscription or API key management","Pay-per-call AI inference (sentiment, summarization, classification, embeddings)","Fetching real-time financial data (prices, exchange rates, gas estimates) with micropayments","Utility operations like geocoding, validation, and data conversion on a per-request basis"],"bestFor":["AI agents that need frictionless, keyless API access via x402","Developers prototyping with low-cost, no-commitment API calls","Applications requiring micropayment-settled data and AI endpoints on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need non-crypto payment methods or off-chain settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.519Z"},"updatedAt":"2026-04-22T01:02:18.972Z"}}