{"id":"3dcb8889-e56a-4e1e-b03d-9c76815745c5","shortId":"BH3Jgy","kind":"x402","title":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call API endpoints spanning data & analytics, 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 on the platform are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/83` is labeled \"Premium API Access\" and returns a live x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" scheme. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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 spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The platform advertises no API keys, no rate limits, and instant access, but the actual behavior and output of this particular endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-generation","json-response"],"categories":["infrastructure","api-access"],"synonyms":["premium API key","x402 API access","pay-per-call API","USDC API payment","Base network API","lowpaymentfee"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The actual output of /api/v1/apikeys/83 is completely undocumented — unclear what 'Premium API Access' returns","No examples or integration guides available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/83","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/apikeys/83","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 challenge, but there is zero documentation on request parameters, response schema, or what \"Premium API Access\" actually delivers. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. Without knowing what the endpoint returns, this is effectively a stub listing.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T15:24:08.636Z","embedding":[-0.008422852,-0.032104492,0.0463562,0.014266968,0.025527954,-0.04537964,-0.008674622,0.05670166,0.052612305,-0.070007324,0.030517578,-0.044647217,-0.048217773,-0.046875,-0.035827637,0.008392334,-0.022537231,0.0017032623,-0.06365967,0.028747559,0.034423828,-0.031707764,0.0036754608,0.055877686,0.0026893616,-0.014884949,-0.010475159,-0.018096924,-0.0009822845,-0.033447266,0.030532837,-0.028320312,-0.011528015,0.024368286,-0.026000977,-0.005130768,0.007549286,0.034210205,0.027755737,-0.002811432,-0.0018482208,-0.061035156,0.0017280579,0.019592285,-0.033569336,-0.0037841797,0.00011330843,-0.03012085,-0.02532959,0.0017280579,-0.029434204,-0.0038166046,-0.025238037,0.005001068,0.0067596436,0.01374054,-0.021987915,-0.018478394,0.0054969788,0.012886047,0.018157959,-0.057495117,-0.011398315,0.015296936,0.01751709,0.048065186,-0.008552551,0.052825928,0.02255249,0.045043945,0.04937744,0.053741455,0.025405884,0.014373779,-0.007259369,-0.0031929016,-0.0013408661,0.05496216,-0.002231598,-0.016571045,-0.022857666,-0.0016860962,-0.04360962,-0.0068893433,-0.021972656,-0.059173584,-0.02835083,0.003534317,-0.012542725,0.024841309,-0.07434082,-0.026412964,-0.017456055,0.022567749,0.0073776245,0.01309967,-0.030670166,0.017303467,-0.018493652,0.021865845,0.012680054,-0.036621094,0.020126343,0.017501831,0.05722046,0.045715332,0.0008826256,0.030715942,0.0024909973,-0.029510498,-0.033691406,-0.0029945374,-0.020584106,-0.015022278,0.019622803,-0.004486084,-0.020263672,0.010444641,-0.017364502,0.017044067,-0.054748535,0.04699707,0.026687622,-0.016921997,0.0047340393,-0.046142578,-0.0033168793,-0.00043153763,-0.034179688,-0.014465332,0.017105103,0.01133728,0.02154541,-0.0016288757,-0.03286743,0.014373779,-0.013557434,-0.031799316,-0.04559326,-0.006374359,0.024856567,-0.03366089,0.026916504,0.020950317,-0.107910156,-0.017593384,-0.059020996,0.01399231,-0.039916992,-0.012863159,0.008293152,0.018234253,-0.005821228,-0.009048462,0.00049591064,-0.008415222,-0.011177063,0.03225708,-0.011276245,0.042144775,-0.0031700134,0.041625977,0.02520752,0.014732361,0.022369385,0.047454834,0.00096845627,-0.07800293,-0.07720947,-0.032470703,-0.005252838,-0.011764526,-0.029663086,0.022109985,-0.008666992,-0.080322266,-0.032989502,-0.002067566,-0.012123108,-0.03765869,-0.013771057,-0.028900146,0.00680542,-0.0025405884,-0.052947998,-0.012382507,-0.022384644,0.062683105,0.012756348,-0.0030651093,0.026016235,-0.0061073303,0.049072266,0.00705719,-0.017227173,-0.04446411,0.00843811,-0.03111267,0.039978027,0.01222229,0.003534317,-0.03164673,0.03414917,0.055877686,0.023117065,-0.012680054,0.015350342,-0.044189453,-0.0395813,-0.029830933,0.008117676,-0.0043792725,0.0056762695,0.021347046,-0.027435303,-0.018829346,0.0021896362,0.007511139,0.018844604,0.07110596,-0.026977539,-0.010108948,0.0020580292,0.025680542,-0.027938843,0.05328369,0.029006958,0.026123047,-0.027145386,-0.013427734,0.022567749,0.037719727,-0.024505615,-0.004508972,-0.02458191,0.018814087,0.0035209656,0.013679504,0.02784729,-0.017868042,-0.018066406,-0.039276123,-0.013687134,0.032409668,-0.0013027191,-0.022201538,-0.051757812,-0.064453125,0.039154053,0.048431396,0.020843506,-0.0023155212,0.008392334,-0.01927185,-0.004776001,-0.06274414,0.04977417,0.07904053,-0.012962341,-0.019439697,0.024490356,-0.016342163,-0.026947021,-0.016830444,0.0003130436,-0.032684326,-0.019805908,0.012039185,-0.04711914,0.0073661804,0.018844604,0.02607727,0.057861328,-0.018096924,-0.026885986,-0.024475098,0.010620117,0.0049095154,-0.04437256,-0.018600464,0.010032654,0.020080566,0.040985107,-0.021194458,0.02708435,0.0001500845,0.011962891,-0.011253357,-0.025054932,-0.030776978,-0.020477295,0.027664185,0.014549255,-0.060913086,0.02508545,0.0023174286,0.046295166,-0.040039062,0.031341553,-0.019256592,0.007751465,0.043945312,-0.019454956,-0.05545044,-0.010932922,0.023788452,0.038482666,0.044769287,0.021392822,-0.011009216,0.010482788,0.07397461,-0.015335083,-0.0018577576,-0.0018987656,0.019699097,0.03024292,-0.0030651093,-0.059295654,-0.042663574,-0.019943237,-0.03338623,0.021636963,-0.03375244,0.030517578,-0.017150879,-0.0075149536,-0.013900757,0.015670776,-0.030044556,0.031311035,-0.027542114,0.0009212494,-0.017913818,-0.017608643,0.001499176,0.027694702,-0.013687134,0.006011963,0.03881836,0.011268616,-0.006702423,-0.02583313,-0.021942139,-0.02229309,0.007133484,0.03253174,0.028305054,0.021133423,0.039001465,-0.03326416,0.02218628,0.02407837,0.0066719055,0.046020508,-0.022964478,0.0065078735,-0.054351807,-0.05770874,-0.012962341,-0.030014038,0.031341553,0.0026760101,0.000026285648,0.045562744,-0.012664795,-0.0090789795,-0.0513916,0.03845215,-0.030334473,-0.008628845,0.04071045,-0.021118164,-0.047546387,0.010810852,-0.0006341934,0.014572144,0.032196045,0.020751953,0.011672974,0.075683594,0.040374756,0.0035247803,0.015113831,0.019989014,0.016433716,-0.0039520264,-0.024337769,-0.019760132,0.0065078735,0.020950317,-0.02607727,-0.02255249,-0.06817627,0.07562256,0.038635254,0.07324219,0.007648468,0.010566711,0.04748535,-0.0146865845,0.010269165,-0.0078048706,-0.004245758,-0.019348145,-0.044952393,0.018707275,-0.008758545,-0.0023841858,-0.033172607,0.034179688,0.012573242,0.012924194,-0.058380127,0.06097412,0.0059509277,-0.00027656555,0.011131287,0.0062179565,0.04156494,0.037261963,-0.041412354,0.0044937134,0.013183594,-0.03201294,0.0023078918,0.04333496,-0.004337311,-0.015350342,-0.056274414,-0.025619507,0.0059547424,-0.013793945,-0.06317139,-0.007259369,0.001914978,0.018936157,0.029037476,-0.035705566,-0.028305054,0.0070228577,-0.028564453,-0.05609131,0.0018062592,-0.05670166,0.019088745,0.038391113,-0.039916992,-0.013221741,0.010154724,-0.00869751,-0.014122009,0.017349243,0.004928589,0.004070282,-0.05105591,0.02468872,0.00617218,0.0029315948,0.016830444,0.016921997,0.02444458,0.011756897,0.04437256,0.0042381287,-0.02116394,-0.05166626,0.03250122,-0.04385376,0.002380371,0.0029182434,-0.018600464,-0.013206482,-0.008155823,-0.028121948,-0.031463623,0.010116577,-0.019882202,0.024398804,0.046020508,-0.050598145,-0.020568848,-0.056549072,-0.019012451,-0.00028562546,0.0713501,0.03225708,-0.012626648,-0.06506348,-0.008216858,0.013061523,0.00674057,0.0056419373,-0.014930725,-0.0009994507,-0.003921509,-0.012992859,-0.028427124,-0.01586914,0.036010742,-0.008148193,-0.003917694,0.019500732,0.013587952,0.0037212372,-0.0005760193,0.0079193115,0.03289795,-0.0309906,-0.004131317,-0.026184082,0.0061187744,-0.0018968582,-0.009468079,-0.046295166,0.04425049,0.005947113,0.038024902,-0.03640747,0.0044021606,0.004005432,0.018157959,0.011230469,-0.00017118454,-0.0073928833,0.0032691956,-0.04586792,-0.082092285,0.033935547,-0.023910522,0.033111572,0.0056533813,0.006526947,0.03314209,-0.007385254,-0.0018901825,0.038208008,-0.024963379,-0.014503479,-0.0357666,-0.035339355,-0.0057640076,0.020812988,-0.014823914,0.012321472,-0.009605408,0.007713318,-0.013885498,-0.027008057,0.025924683,0.008575439,-0.010368347,0.014480591,0.0076293945,0.014335632,0.05206299,0.008880615,-0.023452759,0.02859497,0.011795044,0.00687027,-0.0022907257,0.040893555,0.027191162,-0.02809143,-0.00315094,0.0063819885,-0.0073661804,-0.012001038,-0.015930176,0.008460999,0.030349731,0.00484848,-0.039276123,0.02772522,0.022567749,-0.026473999,-0.0035648346,0.018066406,0.032562256,-0.03894043,0.03062439,0.01838684,0.057037354,-0.010314941,-0.009361267,-0.0013570786,0.020248413,0.010055542,0.013969421,-0.017242432,0.008049011,-0.02406311,0.009559631,-0.00756073,0.002532959,0.015571594,-0.012489319,0.0064888,0.02961731,0.018737793,-0.016494751,-0.0357666,0.002155304,-0.013244629,-0.010215759,0.006793976,0.024398804,0.018371582,-0.023666382,0.024093628,0.016723633,-0.03567505,-0.020629883,-0.016174316,0.05227661,-0.011642456,-0.0016088486,0.009689331,0.0019464493,0.026428223,-0.04940796,-0.00071430206,0.021148682,0.0154800415,-0.019317627,-0.061920166,-0.02909851,-0.008476257,0.042175293,-0.00079393387,0.018325806,0.020339966,0.009498596,-0.00920105,0.022445679,0.0070114136,-0.01411438,-0.016036987,-0.03274536,-0.01033783,0.0047798157,-0.00011372566,-0.017959595,0.013282776,-0.013793945,-0.028457642,0.016311646,-0.009971619,-0.011108398,-0.006336212,0.012290955,0.034484863,0.0037288666,0.01739502,-0.021530151,-0.030776978,0.0099487305,0.00831604,0.0158844,-0.041748047,0.029754639,-0.018600464,-0.017425537,-0.008399963,0.00957489,0.0062789917,0.017501831,-0.0021629333,0.030822754,-0.04928589,0.040771484,-0.058288574,0.0056610107,0.004207611,-0.02519226,-0.0017881393,-0.035095215,-0.025619507,0.031433105,-0.01399231,0.0006995201,-0.030044556,-0.02809143,0.0052375793,-0.04434204,0.023361206,0.028274536,0.039031982,-0.036376953,0.0027675629,-0.0030059814,-0.0079193115,-0.009353638,-0.001250267,-0.0034885406,0.024459839,0.025283813,-0.005607605,-0.019210815,-0.016525269,-0.0061454773,-0.015975952,-0.04006958,-0.05328369,-0.014205933,0.015464783,-0.0006713867,0.0038604736,-0.037963867,-0.02746582,0.0053901672,-0.04598999,0.008415222,-0.0035514832,0.0052108765,0.008804321,-0.007881165,0.004573822,0.032928467,-0.035308838,0.039764404,-0.002067566,-0.011177063,-0.038330078,0.00074338913,0.040924072,0.013717651,0.0011529922,-0.008148193,-0.0069885254,-0.02798462,-0.044708252,-0.017318726,-0.0121536255,0.003824234,0.005001068,-0.0009083748,-0.04537964,-0.016281128,-0.028564453,-0.004283905,0.02168274,0.03842163,0.014831543,0.003665924,0.003271103,-0.008392334,-0.0067710876,-0.044769287,0.007980347,0.010765076,-0.003829956,0.022003174,0.04724121,0.025161743,-0.0041389465,0.004966736,-0.008804321,0.023864746,-0.020355225,-0.00028324127,-0.030670166,0.011451721,-0.0060806274,-0.019317627,-0.028518677,0.00039458275,0.07879639,0.009513855,-0.0059051514,-0.0072746277,-0.01411438,0.01902771,0.026504517,-0.07788086,-0.007926941,-0.024414062,0.019683838,-0.014404297,0.020858765,-0.0027770996,0.0037078857,-0.020935059,-0.052001953,0.00030446053,0.0104522705,0.005115509,-0.056915283,-0.016067505,-0.036621094,-0.015792847,-0.014930725,-0.005558014,0.00447464,0.0072135925,-0.021209717,-0.07849121,0.006839752,0.057617188,0.018157959,0.011619568,-0.025817871,-0.004108429,0.017669678,-0.034576416,-0.011802673,0.027938843,-0.023345947,-0.02130127,-0.022399902,0.04034424,-0.03062439,-0.016830444,0.027252197,-0.0034389496,0.040039062,-0.0042037964,0.012374878,-0.0041618347,0.0056533813,-0.016067505,0.008476257,-0.0017223358,-0.01096344,0.025924683,-0.05105591,0.016784668,0.02609253,0.013153076,-0.0018672943,0.026184082,0.035186768,-0.042541504,-0.015045166,0.03845215,-0.0082092285,0.03062439,-0.03564453,0.04953003,0.011276245,-0.011421204,0.020339966,-0.017059326,-0.022979736,-0.05203247,-0.0340271,0.023895264,0.020690918,0.016433716,-0.014190674,-0.0018844604,0.035339355,0.0017032623,0.0072784424,-0.026855469,-0.01751709,-0.026565552,-0.0006904602,0.0058135986,-0.0044784546,0.0021514893,0.027297974,0.028198242,0.039367676,-0.0021152496,-0.011894226,0.016921997,0.014122009,-0.010559082,-0.005935669,0.01701355,0.017547607,0.013885498,0.022338867,0.013259888,-0.037475586,-0.01424408,-0.031433105,-0.006134033,0.01210022,-0.0037193298,-0.015556335,-0.0029392242,0.0033187866,0.007865906,-0.03314209,0.025802612,-0.046020508,-0.026443481,0.0047416687,-0.010253906,0.009933472,0.0118637085,0.011054993,0.01524353,-0.0028533936,0.057861328,0.012207031,-0.0009794235,0.02911377,0.038513184,0.015022278,-0.021652222,-0.007827759,-0.009376526,0.0034809113,-0.0009174347,-0.02243042,0.018829346,0.033935547,-0.026138306,0.015899658,0.0066719055,0.020568848,-0.016159058,0.011154175,0.0013942719,0.022781372,-0.028167725,0.034576416,-0.04119873,0.012168884,0.017929077,0.0053367615,-0.0010633469,-0.02861023,-0.029373169,0.009468079,0.0065345764,-0.03466797,0.042053223,-0.010139465,0.024139404,-0.015792847,-0.033721924,0.005554199,-0.039367676,-0.026260376,0.03173828,-0.018997192,-0.0154800415,0.027114868,-0.014228821,0.02772522,-0.033416748,-0.0028591156,0.015403748,-0.0129470825,-0.022964478,-0.00092458725,-0.017837524,-0.009597778,-0.005142212,-0.0046463013,0.0018596649,0.046875,0.04248047,0.020141602,0.042175293,0.0072021484,0.0053749084,-0.041809082,-0.017822266,0.006916046,-0.021621704,0.019073486,-0.0043182373,0.05960083,0.033325195,0.0027198792,0.029693604,0.034118652,0.027694702,-0.0024986267,0.008338928,-0.0046958923,0.023986816,-0.009925842,0.030014038,-0.003129959,0.034606934,-0.04284668,0.0032806396,0.009742737,0.013313293,-0.02885437,0.040130615,0.06945801,0.03012085,-0.01473999,0.04623413,-0.005432129,-0.007610321,-0.024230957,-0.0131073,0.050720215,0.023162842,0.040283203,0.037841797,0.008666992,0.0018873215,0.015960693,-0.030441284,-0.03390503,0.058746338,0.02142334,-0.025253296,-0.008071899,-0.016479492,0.0019950867,-0.05609131,-0.028808594,0.009361267,-0.00605011,0.00018811226,-0.016159058,-0.0037345886,-0.018814087,0.016036987,0.010810852,0.016281128,-0.01751709,0.035186768,0.016799927,0.007881165,0.029037476,0.0007004738,0.03427124,-0.033721924,-0.023803711,0.015098572,0.026733398,-0.000047922134,-0.0074386597,0.01625061,0.020645142,0.061828613,0.038482666,-0.012557983,0.0047721863,0.024993896,0.01828003,0.0032539368,0.05734253,0.02482605,0.0077285767,0.028533936,0.03286743,0.017669678,-0.038208008,0.0037078857,-0.0017347336,0.005191803,-0.008811951,-0.023162842,0.005542755,-0.018661499,0.018203735,0.0012788773,-0.013648987,0.03314209,0.019897461,0.005744934,0.0028858185,-0.0040359497,0.009429932,-0.0032653809,0.005970001,0.0118255615,-0.009841919,0.027801514,0.012481689,0.01576233,-0.037475586,0.030532837,-0.0050239563,-0.014884949,-0.01625061,0.006011963,-0.04156494,-0.00063848495,-0.0010004044,-0.0037384033,-0.03012085,0.018188477,0.026794434,0.0048980713,0.035980225,0.0211792,0.0032367706,-0.0008416176,0.014083862,0.015853882,-0.018630981,-0.0099105835,-0.02432251,0.0093307495,0.0262146,0.00023758411,0.013969421,-0.019195557,0.003030777,0.010147095,-0.02746582,0.009513855,0.0007915497,-0.023986816,-0.03363037,0.0069236755,0.048797607,0.018600464,0.038513184,-0.0038871765,-0.023666382,0.0035114288,0.02053833,0.004928589,0.0118637085,-0.023040771,0.027359009,0.00085639954,0.05001831,0.03842163,0.007843018,0.027252197,-0.02885437,-0.019226074,0.004436493,-0.01512146,0.01638794,-0.014160156,0.012283325,-0.012969971,0.029586792,-0.0178833,-0.03414917,0.0033073425,-0.014808655,-0.0051574707,-0.024932861,0.0149383545,0.0064888,0.022460938,0.04055786,0.02420044,-0.027435303,0.06768799,-0.0049743652,0.05206299,-0.02406311,-0.012535095,0.04232788,0.034576416,0.03250122,0.015464783,0.0064849854,-0.018630981,0.014190674,0.050628662,0.038330078,0.0029754639,0.0015773773,-0.023712158,0.027404785,0.0074043274,0.022003174,-0.0051231384,-0.015914917,0.006385803,-0.008140564,-0.021820068,0.009162903,-0.009963989,0.011787415,0.04071045,-0.037719727,-0.019348145,-0.015975952,-0.02178955,0.025360107,-0.00592041,0.011856079,-0.010017395,-0.026977539,0.0074691772,-0.019973755,-0.006793976,-0.0025482178,0.03652954,-0.044189453,-0.010940552,-0.00969696,0.030014038,-0.024765015,0.018035889,0.039215088,-0.017547607,0.012550354,0.04727173,-0.0054473877,0.045776367,-0.009849548,0.01991272,0.05026245,0.009552002,-0.006389618,0.01777649,0.01449585,-0.020462036,0.009613037,0.038513184,-0.011436462,0.0060806274,0.005367279,-0.010620117,0.007701874,0.004627228,0.00035524368,-0.0016269684,-0.012145996,-0.0005469322,-0.0025348663,0.023223877,0.008628845,-0.0015916824,0.0019216537,-0.017150879,0.012786865,0.027374268,0.006160736,-0.031463623,-0.0035152435,0.018417358,0.019515991,-0.0076675415,-0.015960693,-0.016860962,-0.04156494,0.013595581,0.0340271,0.0027713776,-0.0013141632,-0.028808594,-0.0014286041,0.023513794,0.0109939575,0.0035247803,0.0066871643,-0.005882263,0.0075683594,-0.014640808,-0.012145996,-0.013298035,-0.0062294006,0.009963989,0.031173706,-0.0066490173,-0.021652222,0.016189575,0.0055007935,0.01058197,-0.004009247,-0.011428833,0.03062439,-0.014305115,-0.008239746,-0.00869751,0.014793396,-0.022644043,-0.017562866,-0.020385742,0.016952515,0.03933716,-0.0095825195,-0.018936157,0.0076560974,0.013244629,0.01776123,0.028778076,0.007835388,0.044311523,0.027328491,-0.0132369995,-0.021392822,0.005432129,-0.015853882,-0.037353516,0.014915466,-0.015136719,-0.017715454,0.035308838,0.006603241,-0.0049476624,-0.03302002,-0.010940552,0.0019416809,-0.015533447,0.02508545,-0.019363403,0.0070114136,-0.023757935,0.0006456375,0.0031166077,-0.0027618408,-0.03451538,-0.02696228,0.0014600754,-0.014320374,-0.04763794,0.0007009506,-0.03152466,0.008300781,-0.008270264,-0.012054443,-0.00097322464,0.035186768,-0.006416321,0.002319336,0.014152527,0.029190063,0.010055542,0.020935059,0.03503418,-0.01713562,-0.026977539,-0.023742676,0.014976501,-0.019592285,0.02708435,-0.004119873,0.038970947,0.00932312,-0.010917664,0.00223732,-0.011222839,-0.013702393,-0.008239746,-0.017105103,-0.018005371,0.014793396,0.025054932,-0.0006227493,-0.006290436,0.04748535,-0.02180481,-0.0011348724,0.020935059,0.05065918,0.006290436,0.049072266,-0.00018429756,-0.009178162,-0.025253296,0.005050659,-0.024612427,0.007587433,0.022247314,0.0054855347,-0.0033626556,-0.0038871765,0.0047187805,-0.014663696,0.013153076,0.017593384,0.004798889,-0.015586853,0.03062439,0.00819397,0.011756897,-0.0149383545,-0.014205933,0.013938904,0.034423828,0.014968872,0.0010232925,-0.0022029877,0.011428833,-0.010009766,0.007926941,0.018508911,-0.025634766,-0.032989502,-0.025054932,-0.037750244,0.025878906,0.014427185,0.010421753,-0.00063467026,0.010559082,-0.017501831,-0.033996582,-0.014297485,0.028320312,0.008171082,-0.0121536255,-0.01348114,0.0067710876,0.019699097,-0.023880005,0.0033245087,-0.04574585,-0.023727417,-0.0074043274,-0.023849487,0.013015747,0.007331848,-0.009216309,0.010894775,-0.0065193176,-0.003484726,0.0058631897,0.025741577,-0.006336212,-0.005332947,0.001247406,0.015731812,-0.012062073,0.0031051636,-0.01625061,-0.009605408,0.027145386,-0.0055732727,0.016433716,-0.010185242,0.022247314,-0.0005440712,-0.010139465,0.03286743,0.0031814575,0.009231567,-0.020019531,0.0033187866,-0.0013284683,-0.004764557,0.022857666,-0.015823364,-0.030639648,0.003194809,-0.012779236,-0.034088135,-0.000054359436,0.03479004,0.035003662,-0.011459351,0.03100586,-0.019332886,-0.008392334,0.014678955,0.001455307,-0.018066406,-0.0032482147,0.05609131,0.0031700134,-0.008796692,-0.0007648468,0.008804321,-0.02658081,-0.021011353,0.018981934,-0.0061035156,-0.009483337,0.019821167,0.0076293945,0.033111572,0.0021953583,0.0070228577,0.016036987,0.00207901,0.022415161,0.002943039,0.051849365,-0.009719849,-0.035827637,0.006767273,0.023101807,-0.023040771,-0.0014867783,-0.011421204,0.0064811707,-0.037963867,0.02758789,-0.011741638,0.023452759,-0.022354126,0.004207611,-0.017364502,-0.023788452,-0.02909851,-0.005126953,-0.042541504,0.0016794205,0.043182373,0.019302368,0.00907135,-0.003408432,-0.035705566,0.044952393,0.049560547,-0.0020256042,-0.026901245,-0.011245728,0.0050621033,-0.0030765533,-0.004135132,0.008361816,-0.030273438,-0.015426636,-0.0024662018,-0.017852783,0.0018672943,-0.004135132,0.015464783,0.004688263,-0.011566162,0.0070152283,0.028518677,-0.0016813278,-0.008125305,0.0024375916,0.006462097,0.042388916,0.024795532,-0.015312195,0.022003174,0.020858765,-0.033081055,0.05517578,-0.02217102,0.018936157,-0.021774292,0.006046295,-0.04232788,-0.013015747,-0.007980347,0.0023536682],"createdAt":"2026-04-18T19:29:32.571Z","updatedAt":"2026-04-23T06:31:45.984Z","lastSeenAt":"2026-04-23T06:31:45.984Z","tsv":"'/api':171 '/api/v1/apikeys/83':110 '/docs':170 '/pricing':172 '/readme':174 '0.02':10,24,97,141 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':135 '20':129 '2913':136 '300':154 '402':123 '6':139 'Base network API' 'USDC API payment' 'accept':159 'access':36,115,216 'actual':203,219 'address':150 'advertis':207 'ai':63 'analysi':67 'analyt':62 'api':4,18,35,58,114,209 'api-key-generation' 'application/json':164 'base':8,22,105,131,138 'behavior':220 'broader':47 'call':57 'challeng':121 'classif':70 'connect':180 'content':186 'convers':87 'data':61 'decim':140 'document':165,195 'embed':71 'endpoint':6,20,30,59,90,109,158,202,226 'estim':81 'exact':144 'exampl':198 'exchang':76 'extrem':167 'feed':75 'financ':72 'gas':80 'gate':3,17 'generat':88 'geocod':85 'http':122 'infrastructur':83 'instant':215 'json-response' 'key':5,19,210 'label':112 'learn':65 'limit':213 'live':119 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':64 'made':148 'network':106 'offer':50 'openapi':190 'output':222 'page':175 'part':44 'particular':225 'pay':9,23,55 'pay-per-cal':54 'pay-per-call API' 'pay-per-request' 'payment':40,125,146 'per':13,27,56,98 'platform':48,93,206 'post':160 'premium':34,113 'premium API key' 'price':74,95 'prompt':182 'protocol':41 'provid':33 'quot':79 'rate':77,212 'remain':227 'render':177 'request':14,28,99,124,161 'request/response':193 'return':117,163,204 'schema':194 'scheme':145 'second':155 'sentiment':66 'settl':100 'span':60 'spars':168 'spec':191 'specif':108 'summar':69 'text':68 'timeout':156 'token':78 'undocu':228 'unit':132 'usdc':12,26,102,134 'usdc-base' 'util':84 'valid':86 'varieti':52 'via':37,142 'wallet':181 'web3':73 'x402':2,16,39,120 'x402 API access' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"37b515e8-ada5-4c7b-acbb-acbe83ab10f1","listingId":"3dcb8889-e56a-4e1e-b03d-9c76815745c5","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/apikeys/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:32.571Z"}],"sources":[{"listingId":"3dcb8889-e56a-4e1e-b03d-9c76815745c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:32.571Z","lastSeenAt":"2026-04-23T06:31:45.984Z"}],"details":{"listingId":"3dcb8889-e56a-4e1e-b03d-9c76815745c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/83 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/83"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/83"}],"useCases":["Purchasing API access keys via micropayment without traditional signup","Programmatic agent-driven acquisition of API credentials","Pay-as-you-go access to a multi-category API platform"],"bestFor":["Agents or scripts that need instant API access without registration","Developers wanting to test x402 payment flows on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.997Z"},"updatedAt":"2026-04-23T06:31:45.984Z"}}