{"id":"61a53e88-1c54-4c2b-a390-c6dd55f2ee48","shortId":"gEHygG","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that gates access behind x402 micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/lab/results/23` is listed as \"Premium API Access\" and returns JSON content upon payment. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers endpoints across several 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 uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/lab/results/23`) appears to be a lab/results resource, but no documentation describes what data it returns beyond the generic \"Premium API Access\" label. The endpoint is live and responds with a proper 402 challenge on POST. There is no OpenAPI schema, no detailed documentation, and no example responses available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["data","api-gateway"],"synonyms":["micropayment API","x402 endpoint","pay-per-call API","USDC API access","Base network API","lab results API","lowpaymentfee"],"warnings":["No documentation available for what this specific endpoint returns — 'Premium API Access' is the only description","No OpenAPI or JSON schema provided for request or response bodies","No example responses available; actual payload content is unknown","The '/api/v1/lab/results/23' path suggests a specific resource ID (23) but no context is given for what 'lab results' means in this domain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/23","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/lab/results/23","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 challenge with clear pricing, but there is no OpenAPI schema, no documentation of request/response formats, and no description of what '/api/v1/lab/results/23' actually returns. The listing is essentially a stub with confirmed liveness and pricing.","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":"2026-04-21T22:18:59.067Z","embedding":[-0.008865356,-0.026855469,0.046020508,0.012176514,0.019760132,-0.020950317,-0.024597168,0.02355957,0.06665039,-0.08123779,0.034362793,-0.05026245,-0.024215698,-0.029907227,-0.026565552,0.0019445419,0.0031604767,0.006416321,-0.05218506,0.030517578,0.034606934,-0.02935791,-0.020751953,0.02760315,-0.0031032562,-0.032287598,0.0058021545,-0.0042533875,-0.012283325,-0.028930664,0.023025513,-0.02508545,-0.018936157,0.0041275024,-0.02381897,-0.0047187805,-0.0018787384,0.02935791,0.023468018,-0.016723633,-0.0060157776,-0.055541992,0.010734558,-0.0058059692,-0.052246094,-0.012664795,0.012306213,-0.03768921,0.0001565218,-0.01083374,-0.032989502,-0.0019702911,-0.0005874634,-0.014320374,0.009643555,0.014640808,0.0006532669,-0.0032405853,0.011108398,-0.0026187897,-0.0013952255,-0.059143066,-0.010017395,0.004322052,0.008583069,0.05731201,-0.011932373,0.040863037,0.020950317,0.056671143,0.044006348,0.06665039,0.020217896,0.021697998,-0.0073928833,-0.011299133,0.0015945435,0.05117798,-0.017791748,-0.024841309,-0.013458252,-0.023742676,-0.022125244,0.011398315,-0.007835388,-0.053588867,-0.021774292,0.020507812,-0.009986877,0.024612427,-0.07598877,-0.014518738,-0.0046691895,0.015205383,0.018356323,0.0036125183,-0.0074424744,0.011940002,-0.008712769,0.009895325,0.0107421875,-0.03933716,0.018737793,0.0047836304,0.021652222,0.05026245,0.005809784,0.028259277,0.00015676022,-0.014732361,-0.0064849854,0.02243042,-0.019195557,-0.001739502,0.01184845,0.005531311,-0.018814087,0.01940918,-0.030578613,0.01689148,-0.049713135,0.05444336,0.00920105,-0.021636963,0.014846802,-0.03579712,0.009742737,0.002609253,-0.013679504,-0.01689148,0.030731201,0.011566162,0.026885986,-0.012298584,-0.038970947,0.030685425,-0.015838623,-0.030227661,-0.051116943,-0.03591919,0.044799805,-0.024963379,0.033477783,0.033599854,-0.076293945,-0.016052246,-0.04055786,0.012046814,-0.0075645447,0.002325058,-0.008476257,0.037353516,-0.030517578,-0.0020771027,-0.029922485,-0.026901245,0.014266968,0.025985718,-0.027130127,0.04348755,-0.0028152466,0.023391724,0.023330688,0.0074157715,0.029037476,0.035705566,0.00045871735,-0.06817627,-0.08758545,-0.011161804,-0.016860962,-0.011314392,-0.032714844,-0.0019607544,-0.008049011,-0.056243896,-0.01953125,-0.01121521,0.00045323372,-0.053863525,-0.016113281,-0.03414917,0.011367798,0.006259918,-0.066711426,-0.03036499,-0.020004272,0.053100586,0.020324707,0.019042969,0.039276123,-0.025283813,0.064575195,0.02432251,-0.026763916,-0.019470215,0.03326416,-0.020767212,0.020492554,0.008277893,0.003419876,-0.024261475,0.039733887,0.046691895,0.013771057,-0.03475952,-0.0066184998,-0.057922363,-0.027313232,-0.04663086,0.0143585205,0.03062439,0.006351471,0.05090332,-0.03111267,-0.02444458,-0.0057525635,0.009628296,0.03250122,0.06201172,0.013191223,-0.0029144287,0.0385437,0.0052757263,-0.057281494,0.034851074,0.04586792,0.0065078735,-0.01235199,-0.038024902,0.03189087,0.028762817,-0.027511597,0.0005631447,-0.014274597,0.03491211,-0.004989624,0.009597778,0.027542114,-0.026275635,-0.020233154,-0.028366089,-0.00340271,0.037078857,0.0057373047,-0.032073975,-0.04058838,-0.08081055,0.04562378,0.042114258,0.032836914,-0.014144897,0.022720337,-0.05267334,-0.013580322,-0.053253174,0.048339844,0.0713501,-0.004875183,-0.020309448,0.01737976,-0.015129089,-0.045806885,-0.0035057068,-0.014465332,-0.020843506,-0.020523071,0.023880005,-0.05596924,-0.0028095245,0.013320923,0.021224976,0.06060791,-0.016616821,-0.031280518,-0.018554688,0.009544373,0.015701294,-0.028366089,0.004348755,-0.018295288,0.035980225,0.023483276,-0.009796143,0.020202637,-0.00484848,0.0008735657,-0.015357971,-0.00014352798,-0.018478394,-0.026382446,0.012382507,0.0032367706,-0.05984497,0.00010943413,-0.0059890747,0.06921387,-0.05429077,0.0413208,-0.0104522705,-0.0042648315,0.049102783,0.00749588,-0.053344727,0.0062789917,0.038146973,0.031188965,0.048675537,0.0031433105,-0.025985718,-0.016143799,0.07366943,-0.013389587,-0.0021476746,0.006389618,0.011886597,0.035980225,-0.004962921,-0.052520752,-0.034606934,-0.010559082,-0.045196533,0.027313232,-0.0289917,0.017349243,-0.0067977905,0.011131287,-0.021820068,-0.0075035095,-0.041168213,0.012008667,0.0029258728,0.0064430237,-0.010856628,-0.0022945404,0.0049972534,0.00705719,-0.0069236755,0.017028809,0.041534424,0.011817932,-0.0056533813,-0.042022705,-0.014480591,-0.0010633469,0.0026836395,0.034332275,0.01828003,0.014732361,0.03741455,-0.026977539,0.0126953125,0.024291992,0.03149414,0.01374054,-0.009552002,0.0007586479,-0.07232666,-0.044769287,-0.02760315,-0.06384277,0.042022705,0.03086853,0.007003784,0.04650879,0.013389587,-0.034210205,-0.048309326,0.026306152,-0.040130615,-0.0058784485,0.03326416,-0.0085372925,-0.030761719,0.0031223297,0.0019760132,0.013977051,0.040405273,0.025985718,0.028900146,0.07128906,0.053588867,0.010879517,0.015975952,0.024932861,0.03302002,-0.0054626465,-0.02420044,-0.044952393,-0.014129639,0.015808105,-0.02053833,-0.009117126,-0.07977295,0.052124023,0.054016113,0.078125,0.031341553,0.006504059,0.03765869,-0.025299072,0.0046424866,-0.03829956,-0.011451721,-0.012527466,-0.05203247,0.03164673,-0.005844116,0.012535095,-0.025283813,0.02168274,0.00022876263,0.01763916,-0.029800415,0.05731201,0.0021896362,-0.0065307617,0.032470703,-0.0007004738,0.051513672,0.057159424,-0.048950195,0.044830322,0.030761719,-0.017120361,-0.001209259,0.037597656,-0.0206604,-0.009399414,-0.049194336,-0.044891357,-0.009521484,-0.014503479,-0.05343628,-0.016906738,0.0056533813,0.013084412,0.02128601,-0.031066895,-0.028396606,0.01852417,0.00061273575,-0.037841797,-0.003271103,-0.0423584,0.01751709,0.027877808,-0.02458191,-0.001543045,-0.0013093948,0.0004312992,-0.010116577,0.013000488,0.019104004,-0.00042128563,-0.062347412,0.02078247,-0.0016021729,0.021148682,0.004611969,0.037139893,0.007507324,0.03567505,0.047027588,0.00856781,-0.012336731,-0.060546875,0.011528015,-0.049438477,-0.0055122375,0.021316528,-0.025939941,-0.0019950867,-0.015357971,-0.02861023,-0.012916565,0.002866745,-0.049041748,0.004852295,0.02670288,-0.027420044,-0.03237915,-0.05419922,-0.02911377,-0.023208618,0.06359863,0.024841309,0.0021839142,-0.06402588,-0.01776123,0.023239136,0.0026626587,0.031341553,-0.015853882,-0.013160706,-0.008087158,-0.03289795,0.0034942627,-0.016326904,0.032318115,-0.0026950836,-0.018127441,0.017532349,0.021896362,0.024932861,0.0010194778,0.010559082,0.032287598,-0.026916504,0.0021705627,-0.019882202,0.04559326,0.022354126,-0.010551453,-0.05114746,0.033203125,0.01158905,0.02645874,-0.03338623,0.0075149536,-0.0040664673,0.008918762,0.005355835,-0.0126953125,-0.013465881,-0.017120361,-0.05206299,-0.08166504,0.047912598,-0.014503479,0.02166748,0.01727295,0.0178833,0.027404785,-0.009490967,-0.009437561,0.031066895,-0.0158844,-0.01550293,-0.036956787,-0.028060913,-0.011459351,-0.01663208,-0.01399231,0.015914917,-0.025436401,0.008888245,-0.001534462,-0.015899658,0.015007019,-0.00021469593,-0.0064086914,0.020507812,-0.0037841797,0.014801025,0.036010742,0.014427185,-0.040161133,0.009284973,0.0041122437,0.010032654,0.0056114197,0.0501709,0.027420044,-0.015151978,-0.0098724365,-0.0051078796,-0.028503418,-0.021911621,0.006931305,0.012481689,0.017166138,-0.0045661926,-0.032928467,0.012466431,0.009635925,-0.031188965,-0.011413574,0.020202637,0.015075684,-0.02432251,0.012458801,0.035369873,0.05078125,-0.01600647,0.00032639503,0.0004892349,0.028289795,0.02633667,0.018066406,-0.011909485,0.01789856,-0.0074882507,0.014556885,-0.0039901733,-0.012130737,0.028961182,-0.0006160736,0.026794434,0.01525116,-0.0036258698,-0.018066406,-0.02355957,0.0049476624,-0.0011711121,-0.017700195,0.017623901,0.028259277,0.03186035,-0.025894165,0.017196655,-0.000009596348,-0.034973145,-0.024093628,0.0008058548,0.03945923,-0.018447876,-0.014450073,0.019363403,0.011375427,0.024597168,-0.049468994,-0.0066223145,0.0021038055,0.010910034,-0.02520752,-0.048858643,-0.03756714,-0.007583618,0.036834717,0.009529114,0.019119263,0.030761719,-0.0043411255,0.015899658,0.01991272,-0.006088257,-0.0026283264,-0.020721436,-0.037628174,0.012962341,-0.0017795563,-0.005619049,-0.04168701,0.009048462,-0.013374329,-0.029876709,-0.0021686554,-0.011367798,-0.007293701,-0.0146102905,0.010177612,0.029846191,0.0015897751,0.006011963,-0.01725769,-0.04208374,0.004497528,0.0096206665,0.0104522705,-0.047302246,0.015449524,-0.01134491,-0.0137786865,-0.0023422241,0.018585205,0.016494751,0.029037476,0.0025806427,0.030334473,-0.037994385,0.027404785,-0.023086548,-0.00025844574,0.0026721954,-0.03668213,-0.016403198,-0.018676758,-0.018707275,0.039093018,-0.009994507,-0.0051651,-0.03302002,-0.037597656,-0.017349243,-0.04953003,0.013298035,0.0546875,0.0357666,-0.013450623,0.0012693405,-0.0017185211,-0.003370285,-0.014320374,0.012504578,-0.014572144,0.0368042,0.005077362,0.011871338,-0.031066895,-0.017547607,-0.023544312,0.0057792664,-0.051727295,-0.045013428,-0.016448975,0.0019989014,-0.0074768066,0.012634277,-0.019378662,-0.021713257,-0.0058021545,-0.0413208,0.02217102,0.009643555,0.007423401,0.0044021606,-0.029342651,-0.0050201416,0.020477295,-0.015991211,0.04095459,0.011932373,-0.026260376,-0.036132812,0.006187439,0.02720642,0.02798462,-0.0035762787,-0.021087646,0.0073051453,-0.01965332,-0.06213379,-0.014442444,-0.0074424744,-0.010284424,-0.009552002,0.0036125183,-0.048034668,-0.00024056435,-0.02784729,0.0019721985,0.024246216,0.017059326,0.011833191,0.011138916,0.010391235,-0.004207611,0.0051498413,-0.04244995,0.011817932,0.011604309,0.004924774,0.019241333,0.05596924,-0.010040283,-0.020904541,0.0024700165,0.0006928444,0.019851685,-0.013900757,0.008666992,-0.0030784607,0.005695343,-0.002527237,-0.012794495,-0.025665283,-0.0073013306,0.08532715,-0.0015640259,-0.014328003,-0.016036987,-0.017578125,0.023712158,0.033355713,-0.028640747,-0.014305115,-0.028533936,0.012672424,-0.009918213,0.024963379,0.008262634,0.026809692,-0.018005371,-0.059692383,-0.02281189,0.005657196,-0.019424438,-0.06915283,-0.028900146,-0.04815674,-0.0012254715,-0.0149002075,-0.02798462,-0.0020751953,0.028823853,-0.027938843,-0.08166504,-0.000029623508,0.039154053,0.0009775162,0.024368286,-0.00894928,0.019073486,0.0149002075,-0.04989624,0.0035686493,0.026977539,-0.038635254,-0.025222778,-0.0178833,0.00995636,-0.010482788,-0.01777649,0.012382507,0.007247925,0.00819397,-0.017669678,0.007896423,-0.01979065,0.019866943,-0.017562866,0.021865845,-0.015487671,-0.0049209595,0.040161133,-0.048980713,0.024719238,0.023590088,0.0011882782,-0.008613586,0.019073486,0.030441284,-0.037475586,-0.0110321045,0.027877808,0.004501343,0.033813477,-0.025283813,0.039001465,0.008071899,-0.018066406,0.013084412,-0.023162842,-0.02684021,-0.03552246,-0.03390503,0.015380859,0.0017051697,0.021972656,-0.020614624,-0.009094238,0.01737976,0.0074806213,-0.00042963028,-0.016342163,-0.017181396,-0.023742676,0.01033783,-0.008422852,-0.0079422,-0.006084442,0.026855469,0.013626099,0.047332764,0.0074157715,-0.013626099,-0.0014648438,0.024154663,-0.0050697327,0.0036067963,0.0066833496,0.0079193115,0.024414062,0.016616821,0.0021247864,-0.045715332,-0.015899658,-0.03439331,-0.011993408,0.009666443,-0.0021915436,-0.011131287,0.004550934,-0.00027608871,-0.007663727,-0.029907227,0.013511658,-0.042144775,-0.019882202,0.008781433,-0.03253174,0.016937256,0.017410278,-0.0030593872,0.019607544,-0.0029754639,0.0496521,-0.0019130707,-0.0055999756,0.033996582,0.030273438,0.022750854,-0.024963379,0.0015678406,-0.01499176,-0.006942749,-0.0014266968,-0.017196655,-0.00035715103,0.04119873,-0.011482239,-0.0040626526,0.013618469,0.017074585,-0.009315491,0.014678955,0.001411438,0.020828247,-0.005329132,0.036468506,-0.041168213,0.035980225,0.021392822,-0.0074272156,-0.014656067,-0.0013074875,-0.025360107,0.01776123,0.013435364,-0.011886597,0.049194336,-0.00030303,0.030731201,-0.026901245,-0.020629883,0.004802704,-0.031585693,-0.013969421,0.03665161,-0.002231598,-0.010261536,0.012527466,-0.03060913,0.037994385,-0.042297363,0.037750244,-0.005138397,-0.0040740967,-0.0067863464,-0.02456665,-0.02041626,0.007926941,-0.0069351196,-0.0054893494,-0.0052223206,0.041503906,0.025268555,0.04034424,0.047332764,0.019973755,0.006023407,-0.038116455,-0.03274536,0.006690979,-0.016189575,0.03640747,-0.0093688965,0.042938232,0.04269409,-0.0011978149,0.029251099,0.03286743,0.02180481,0.021499634,0.008422852,0.0008454323,0.0085372925,-0.0026130676,0.020385742,0.0019607544,0.043182373,-0.038116455,0.020812988,0.011489868,0.020126343,-0.014671326,0.04095459,0.07098389,0.012756348,-0.015380859,0.047576904,-0.0045280457,-0.0206604,-0.0065193176,-0.020126343,0.051513672,0.0077323914,0.05105591,0.047607422,0.018203735,0.0022220612,0.023406982,-0.019195557,-0.037841797,0.052703857,0.026321411,-0.02470398,-0.017349243,-0.006916046,-0.0027179718,-0.042938232,-0.026184082,0.011230469,-0.020004272,0.01713562,-0.015060425,0.00007677078,-0.00522995,0.0064964294,0.029571533,0.018920898,-0.010803223,0.038238525,0.014854431,-0.0085372925,0.022399902,-0.0016307831,0.031036377,-0.031829834,-0.022460938,0.010391235,0.021240234,-0.013465881,-0.021224976,0.010734558,0.008880615,0.054992676,0.04916382,-0.022216797,0.008277893,0.02760315,0.023742676,0.016693115,0.054351807,0.02557373,0.0104599,0.034332275,0.032562256,0.023086548,-0.029205322,0.015258789,-0.00039958954,0.013290405,-0.0073127747,-0.005432129,0.005241394,-0.013633728,0.015045166,-0.005935669,-0.004337311,0.028549194,0.019378662,-0.011787415,-0.012710571,-0.0042037964,0.0079574585,-0.013977051,-0.003118515,0.009689331,-0.014427185,0.03062439,0.009170532,0.03274536,-0.01802063,0.031341553,0.003610611,-0.024291992,0.007751465,0.02734375,-0.04309082,0.0069007874,0.0010223389,-0.000003993511,-0.04663086,0.020141602,0.029418945,-0.018722534,0.027389526,0.008415222,-0.0063552856,-0.004470825,0.029037476,0.015365601,0.0044136047,0.0021457672,-0.020874023,0.034973145,0.046203613,0.003276825,0.0060272217,-0.018920898,-0.005001068,-0.0102005005,-0.0033168793,-0.00095129013,-0.0064430237,-0.01259613,-0.027572632,0.010276794,0.03765869,0.0056037903,0.042938232,-0.01335907,-0.00042629242,0.00920105,0.037628174,0.00894928,-0.007820129,-0.005836487,0.01939392,-0.015930176,0.04977417,0.02116394,0.011886597,0.031066895,-0.006538391,-0.01689148,-0.0015268326,-0.005859375,0.03213501,-0.02458191,0.012336731,-0.0022029877,0.015304565,-0.021575928,-0.039489746,0.014007568,-0.012588501,-0.015289307,-0.023529053,0.009757996,0.01348114,0.021896362,0.034057617,0.027496338,-0.020248413,0.06555176,-0.004173279,0.051513672,-0.012542725,-0.0113220215,0.040771484,0.030715942,0.045074463,0.021331787,0.026672363,-0.024978638,0.036254883,0.026641846,0.023666382,0.014556885,0.013168335,-0.015045166,0.03616333,-0.0015945435,0.030197144,-0.013587952,0.002632141,0.017440796,-0.008903503,-0.0064964294,0.0033893585,-0.0033473969,0.012702942,0.037628174,-0.026794434,-0.0073013306,-0.019561768,-0.005771637,0.032196045,-0.015853882,-0.004558563,0.0016746521,-0.008148193,0.015487671,-0.02960205,-0.014907837,0.012962341,0.021133423,-0.048614502,-0.012786865,0.008735657,0.017044067,-0.030014038,0.02557373,0.015541077,0.0013771057,0.0049324036,0.051971436,-0.0058174133,0.033203125,-0.008720398,0.0289917,0.036193848,-0.0018787384,-0.019622803,0.0016241074,-0.00059080124,-0.02230835,0.017547607,0.033813477,-0.01386261,-0.005542755,0.0005617142,-0.008514404,0.0067863464,0.0010795593,-0.016281128,0.005050659,-0.008857727,-0.0054626465,-0.017105103,0.01878357,-0.0038852692,0.011894226,-0.0135269165,-0.015655518,0.011405945,0.03945923,0.004470825,-0.026885986,-0.005077362,0.0010814667,0.013504028,-0.03173828,-0.018341064,-0.0017528534,-0.04071045,0.015487671,0.005054474,0.0073661804,0.018859863,-0.02331543,-0.0025119781,0.028640747,0.0053100586,0.02154541,-0.009155273,-0.002828598,0.016052246,-0.018585205,-0.0015802383,-0.019638062,-0.014518738,0.012207031,0.02381897,0.004180908,-0.0262146,0.02557373,-0.0043182373,0.01386261,0.0004837513,-0.022903442,0.026657104,-0.014518738,-0.009033203,-0.0014123917,0.020614624,-0.012001038,-0.0036296844,-0.012214661,0.043151855,0.048919678,-0.012046814,-0.0056152344,0.028686523,0.01600647,0.0017576218,0.046417236,0.004737854,0.04055786,0.024276733,-0.031463623,-0.026184082,0.033447266,-0.0054016113,-0.01713562,0.016403198,-0.015792847,-0.02293396,0.00806427,0.012466431,-0.0075683594,-0.02696228,-0.016708374,-0.016036987,-0.015304565,0.015274048,-0.013641357,0.0036830902,-0.018737793,-0.011024475,0.0069618225,-0.017242432,-0.05505371,-0.021438599,-0.0005264282,-0.018432617,-0.053955078,0.018341064,-0.026550293,0.008277893,-0.03564453,-0.0039253235,-0.0093307495,0.034698486,-0.011772156,-0.0019130707,0.025375366,0.011657715,0.020858765,0.0028057098,0.02709961,-0.027664185,-0.030654907,-0.016235352,0.0077171326,-0.008804321,0.02670288,0.0015096664,0.033843994,0.020767212,-0.00894165,-0.00053691864,-0.00806427,-0.016036987,-0.011436462,-0.032714844,-0.014221191,0.024093628,0.009414673,0.0035591125,-0.015594482,0.038604736,-0.018417358,-0.016036987,0.032592773,0.04324341,0.0033779144,0.024307251,-0.009880066,-0.013458252,-0.009239197,0.0071372986,-0.017944336,-0.007434845,0.010734558,-0.007045746,-0.015991211,0.006790161,0.017288208,-0.013328552,-0.015975952,0.017074585,-0.0018558502,-0.0063552856,0.029800415,0.013450623,-0.0029277802,-0.010719299,-0.00592041,0.016723633,0.054351807,0.015777588,0.00032758713,0.005027771,0.00087213516,-0.008476257,0.008148193,0.013687134,-0.02507019,-0.03845215,-0.021697998,-0.02822876,0.029922485,-0.00029063225,0.0053520203,-0.0068969727,0.013320923,0.002752304,-0.036834717,-0.016036987,0.023239136,0.02355957,-0.0034751892,-0.015434265,-0.005947113,0.012321472,-0.029693604,-0.010902405,-0.033996582,-0.040405273,-0.0013017654,-0.024520874,0.02319336,0.008621216,-0.016311646,-0.0084991455,0.0019426346,0.005317688,0.00881958,0.022857666,-0.012016296,0.000910759,0.023651123,0.016418457,-0.02355957,0.012069702,-0.017684937,-0.0027923584,0.021591187,0.0034980774,0.015136719,-0.03277588,0.021697998,-0.011657715,-0.014533997,0.02293396,0.007843018,0.021820068,-0.039916992,0.00982666,0.008842468,-0.00092840195,0.03729248,-0.01965332,-0.029251099,0.00390625,-0.02330017,-0.03363037,0.0024700165,0.02319336,0.047729492,-0.012016296,0.02772522,-0.019119263,-0.011482239,0.006881714,0.008491516,-0.020812988,0.00040125847,0.035980225,0.0032482147,-0.00058460236,-0.0025901794,-0.012550354,-0.022247314,-0.0029735565,0.01864624,-0.009269714,-0.009559631,0.038116455,0.020080566,0.04525757,0.009170532,0.023666382,0.010040283,-0.0057754517,0.013580322,0.008651733,0.047790527,-0.0001667738,-0.027801514,0.023727417,0.0039634705,-0.034118652,-0.0054893494,-0.006626129,0.0004785061,-0.030380249,0.023605347,-0.002521515,0.024169922,-0.021697998,0.013626099,-0.024673462,-0.008422852,-0.030960083,-0.0036373138,-0.030441284,0.004837036,0.029571533,-0.0014896393,0.019500732,0.012931824,-0.024429321,0.026245117,0.051452637,-0.0118637085,-0.019683838,-0.019577026,0.01184845,0.009094238,0.0124053955,0.010986328,-0.020629883,-0.018661499,0.009918213,-0.016433716,0.02053833,-0.0098724365,0.025268555,0.011764526,-0.01084137,-0.0020370483,0.023086548,-0.011749268,-0.0018787384,0.009750366,0.0051574707,0.03012085,0.036193848,-0.0034656525,0.020553589,0.026016235,-0.046203613,0.049713135,-0.011489868,0.021835327,-0.02558899,0.006412506,-0.045166016,-0.023391724,-0.006462097,0.004863739],"createdAt":"2026-04-21T18:32:24.056Z","updatedAt":"2026-04-22T01:02:19.530Z","lastSeenAt":"2026-04-22T01:02:19.530Z","tsv":"'/api/v1/lab/results/23':56,169 '/request':13,28 '0.02':12,27,86,163 '000':78 '0x8335':83 '20':77 '402':200 '6':91 'Base network API' 'USDC API access' 'access':7,22,42,62,189 'across':121 'advertis':72 'ai':131 'amount':75 'analysi':135 'analyt':125 'api':6,21,38,61,94,188 'appear':170 'attach':103 'avail':216 'base':9,24,51,79 'behind':43 'beyond':184 'broader':116 'call':4,19 'caller':101 'categori':123 'challeng':71,201 'classif':138 'content':66 'convers':155 'crawl':219 'data':124,128,181 'decim':92 'describ':179 'detail':210 'document':178,211 'embed':139 'endpoint':55,120,158,168,192 'equal':85 'estim':149 'exampl':214 'exchang':144 'export':129 'feed':143 'financ':140 'gas':148 'gate':41 'generat':156 'generic':186 'geocod':153 'header':108 'infrastructur':151 'insight':130 'json':65 'json-response' 'key':95 'lab results API' 'lab/results':174 'label':190 'learn':133 'limit':98 'list':58 'live':194 'lowpaymentfee' 'lowpaymentfee.com':31,117 'machin':132 'materi':220 'max':74 'metric':126 'micropay':45 'micropayment API' 'network':52 'no-api-key' 'no-rate-limit' 'offer':119 'openapi':207 'particular':167 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':68,107,113 'per':3,18,36,87,164 'platform':39,118 'post':203 'premium':5,20,60,187 'price':142,161 'proof':114 'proper':199 'quot':147 'rate':97,145 'report':127 'request':37,88,165 'requir':100 'resourc':175 'respond':196 'respons':215 'return':64,183 'schema':208 'sentiment':134 'settl':46 'sever':122 'simpli':102 'specif':54 'summar':137 'text':136 'token':146 'uniform':160 'unit':80 'upon':67 'usdc':15,30,48,82,89 'usdc-base' 'use':90 'util':152 'valid':111,154 'via':10,25 'web3':141 'x':106 'x-payment':105 'x402':11,26,44,70,112 'x402 endpoint' 'x402-payment'","prices":[{"id":"67184234-415c-48e1-9a99-eb79b9b78b4a","listingId":"61a53e88-1c54-4c2b-a390-c6dd55f2ee48","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/lab/results/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.056Z"}],"sources":[{"listingId":"61a53e88-1c54-4c2b-a390-c6dd55f2ee48","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.056Z","lastSeenAt":"2026-04-22T01:02:19.530Z"}],"details":{"listingId":"61a53e88-1c54-4c2b-a390-c6dd55f2ee48","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/23"},{"claim":"All endpoints on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/23"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or lab results without subscription or API key management","Agent-driven workflows that need on-demand paid API calls settled in crypto","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 micropayment protocols","AI agents that need keyless, pay-per-use API access on Base","Low-volume consumers who want no-commitment API access at $0.02/call"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.845Z"},"updatedAt":"2026-04-22T01:02:19.530Z"}}