{"id":"ba9606b7-14de-4898-a3e7-e69355f03742","shortId":"H7kddE","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/inbox/161` is labeled \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" payment scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nNote that while the landing page lists many endpoints across multiple categories, the probed endpoint (`/api/v1/inbox/161`) is generically described as \"Premium API Access\" with no further documentation on what data or functionality it actually returns. No OpenAPI spec, request/response schemas, or usage examples are available. The /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","http-post","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment endpoint","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The endpoint path '/api/v1/inbox/161' does not match any of the advertised API paths on the landing page — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","No request body schema or response schema is documented anywhere","Cannot verify that the advertised AI, data, finance, or utility endpoints are actually functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/161","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/inbox/161","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 no documentation, no OpenAPI spec, no request/response schema, and no explanation of what '/api/v1/inbox/161' actually does beyond the generic label 'Premium API Access'. The landing page lists many endpoints but provides no detail on any of them. 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":"2026-04-21T21:46:42.261Z","embedding":[-0.030426025,-0.033569336,0.040802002,0.017471313,0.026489258,-0.03829956,-0.017593384,0.04699707,0.054748535,-0.0725708,0.026168823,-0.035705566,-0.030654907,-0.030838013,-0.024276733,0.022476196,-0.007472992,0.004837036,-0.06390381,0.049560547,0.029968262,-0.013648987,-0.0043144226,0.0552063,-0.0033226013,-0.022232056,0.0008907318,-0.005554199,0.00087594986,-0.035095215,0.025985718,-0.031036377,0.0046539307,0.02810669,-0.007472992,-0.010154724,0.0055885315,0.052856445,0.02494812,-0.0063972473,-0.017944336,-0.04949951,0.025054932,-0.0012550354,-0.049682617,-0.008140564,0.008674622,-0.01675415,-0.02305603,0.0068359375,-0.020065308,0.0040664673,-0.008857727,0.006465912,0.01889038,0.01890564,-0.009712219,0.007247925,0.014549255,0.021957397,-0.0074653625,-0.055023193,-0.016983032,0.013900757,0.017654419,0.043518066,0.0013284683,0.043914795,0.020401001,0.08074951,0.028244019,0.05316162,0.030975342,0.0060310364,0.011482239,-0.033721924,0.00042152405,0.053649902,-0.017608643,-0.00756073,-0.015586853,-0.014518738,-0.054351807,-0.017120361,-0.020141602,-0.06304932,-0.008621216,0.027633667,-0.0357666,0.022613525,-0.08355713,-0.025161743,-0.024276733,0.013595581,-0.005847931,-0.005680084,-0.015350342,0.009246826,-0.0070343018,0.025161743,0.020935059,-0.043182373,0.013122559,0.0012664795,0.04901123,0.033294678,0.015586853,0.026168823,0.014137268,-0.027191162,-0.03338623,0.001458168,-0.028244019,-0.017425537,0.017211914,-0.0005888939,-0.01638794,0.021026611,-0.028137207,0.023330688,-0.04196167,0.050201416,0.006175995,-0.008552551,-0.0059814453,-0.053955078,0.007797241,-0.0064468384,-0.044189453,-0.0076904297,0.027755737,0.015174866,0.033203125,-0.025970459,-0.04498291,-0.0016994476,-0.016662598,-0.025054932,-0.04711914,-0.018310547,0.033233643,-0.036193848,0.027816772,0.024398804,-0.07104492,-0.012718201,-0.048553467,0.0032901764,-0.01689148,-0.0014781952,0.0038547516,0.03125,-0.027404785,-0.031280518,-0.0062065125,-0.024398804,0.0061416626,0.056671143,-0.011116028,0.03213501,0.004875183,0.0065841675,0.02041626,-0.014328003,0.012573242,0.035003662,0.0013360977,-0.09320068,-0.07727051,-0.034362793,0.0050735474,-0.00020992756,-0.03387451,-0.008544922,0.0087890625,-0.072387695,-0.038482666,-0.012001038,0.001871109,-0.049346924,0.0057640076,-0.030654907,0.012298584,-0.03086853,-0.039764404,-0.018997192,-0.020690918,0.052947998,0.0107803345,0.006980896,0.026306152,-0.00932312,0.0625,0.04006958,-0.018859863,-0.05328369,0.014724731,-0.016799927,0.043548584,0.02319336,-0.0007715225,-0.028656006,0.03677368,0.06329346,-0.007091522,-0.015914917,0.005630493,-0.03010559,-0.043518066,-0.02017212,0.02017212,0.0088272095,-0.018630981,0.015365601,-0.04324341,-0.04675293,-0.01272583,-0.0071868896,0.017868042,0.06347656,0.0026569366,0.029129028,0.011138916,0.024978638,-0.017456055,0.050720215,0.037963867,0.015327454,-0.020507812,-0.01134491,0.010215759,0.033172607,-0.03503418,-0.009628296,-0.0053138733,0.028518677,0.0071792603,0.0025463104,0.029891968,-0.011947632,-0.020431519,-0.027542114,0.0014123917,0.015090942,0.023834229,-0.030654907,-0.045166016,-0.06585693,0.022583008,0.05819702,0.035247803,0.0206604,-0.019851685,-0.028930664,0.0010519028,-0.058013916,0.049987793,0.06567383,-0.011444092,-0.017089844,0.026657104,-0.02029419,-0.03286743,0.01235199,0.005332947,-0.015464783,-0.010917664,0.009941101,-0.042053223,-0.0032310486,0.00566864,0.030792236,0.050323486,-0.016647339,-0.037719727,-0.036468506,0.0056648254,-0.010314941,-0.02670288,0.006580353,-0.012138367,0.015686035,0.029937744,-0.006881714,0.024597168,-0.00067567825,0.03286743,-0.017166138,-0.0017566681,-0.03555298,-0.02810669,0.009178162,0.0050239563,-0.056396484,0.019180298,-0.010810852,0.05496216,-0.047943115,0.031707764,-0.0064201355,0.020721436,0.042907715,-0.0022907257,-0.058135986,-0.0014247894,0.0231781,0.045074463,0.05404663,0.017730713,-0.0099487305,-0.0071907043,0.054534912,-0.034973145,-0.00096797943,0.005607605,0.015609741,0.02330017,0.0054359436,-0.039031982,-0.0390625,-0.016952515,-0.022781372,0.03225708,-0.027618408,0.054351807,-0.012123108,0.019577026,-0.015380859,-0.0033798218,-0.043304443,0.016311646,-0.032958984,-0.005554199,-0.021453857,-0.023986816,0.014259338,0.015808105,-0.021484375,-0.017181396,0.044921875,0.021057129,-0.010124207,-0.041778564,-0.02545166,-0.029174805,-0.0060043335,0.027404785,0.031433105,0.015853882,0.035583496,-0.050842285,-0.0043296814,0.03744507,0.0052337646,0.04421997,-0.0071105957,0.016998291,-0.06842041,-0.05307007,-0.010803223,-0.047180176,0.014137268,0.021377563,0.0124435425,0.046722412,0.0068511963,-0.026107788,-0.061676025,0.035247803,-0.046295166,0.01751709,0.04055786,-0.0158844,-0.045318604,0.013015747,0.014755249,0.018310547,0.031280518,0.020431519,0.0056991577,0.083862305,0.037353516,0.0016031265,0.024230957,0.036193848,0.024307251,0.00116539,-0.008605957,-0.022628784,-0.0021820068,0.024765015,-0.027328491,-0.017456055,-0.07946777,0.047912598,0.028030396,0.083740234,0.012939453,0.018173218,0.037231445,-0.0017108917,0.010040283,-0.02079773,-0.025375366,-0.044189453,-0.041625977,0.030273438,-0.010215759,-0.0052986145,-0.03439331,0.011886597,-0.011009216,0.008865356,-0.030426025,0.05923462,0.0003900528,-0.0076560974,0.009399414,0.0112838745,0.053222656,0.038970947,-0.048034668,0.013923645,0.015083313,-0.021896362,0.009513855,0.04321289,-0.0011301041,-0.010276794,-0.072387695,-0.042022705,-0.014503479,-0.021240234,-0.055786133,-0.005748749,-0.020996094,0.022476196,0.0206604,-0.018478394,-0.013168335,0.0046844482,-0.02909851,-0.056549072,-0.0073013306,-0.05291748,0.018173218,0.029449463,-0.03857422,-0.010437012,-0.0017967224,-0.015258789,-0.019119263,0.014633179,0.0008459091,-0.010139465,-0.052703857,0.0317688,-0.0010871887,0.008666992,0.025375366,0.026763916,0.029724121,0.008018494,0.054351807,0.019683838,-0.022232056,-0.04119873,0.026473999,-0.046569824,0.001964569,0.0058937073,-0.015274048,0.0046806335,-0.00034976006,-0.042236328,-0.025619507,0.021835327,-0.012069702,-0.0039901733,0.024414062,-0.040405273,-0.021530151,-0.05429077,-0.023529053,-0.0044517517,0.082092285,0.018920898,-0.0016794205,-0.058258057,-0.006679535,0.010856628,0.007347107,0.011878967,-0.016311646,-0.010421753,-0.015022278,-0.02558899,-0.03930664,-0.009780884,0.03579712,0.014450073,-0.0056037903,0.028747559,-0.0016012192,0.008018494,-0.017608643,-0.0044441223,0.029693604,-0.021392822,-0.017562866,-0.024780273,0.022384644,0.004257202,-0.00028800964,-0.04675293,0.058624268,0.016555786,0.043701172,-0.02734375,-0.0031261444,-0.0028362274,0.02760315,0.012519836,-0.020645142,-0.0026741028,0.015327454,-0.05038452,-0.10101318,0.03677368,-0.021499634,0.008476257,0.007724762,0.014373779,0.029006958,-0.016113281,0.023544312,0.017791748,-0.02798462,-0.009567261,-0.02482605,-0.014968872,-0.0036125183,0.0033550262,-0.011375427,0.013168335,-0.007423401,-0.00021648407,-0.020553589,-0.017028809,0.04269409,0.0059890747,-0.004787445,0.03729248,0.0019378662,0.024780273,0.042755127,0.00819397,-0.034088135,0.0284729,-0.0044136047,0.0034809113,-0.001420021,0.058135986,0.029754639,-0.0025405884,-0.021224976,-0.0052375793,-0.009735107,-0.021011353,-0.0051574707,0.013557434,0.027816772,-0.0011281967,-0.044952393,0.024520874,0.011878967,-0.03729248,-0.011619568,0.016342163,0.022628784,-0.046844482,0.017562866,0.022979736,0.061035156,-0.025482178,0.00957489,0.0051612854,0.039886475,0.02861023,0.008293152,-0.023757935,0.011405945,-0.012512207,0.017105103,-0.0058174133,-0.011047363,0.020324707,-0.004016876,0.019073486,0.040130615,0.020126343,-0.02178955,-0.025543213,-0.00011587143,-0.009414673,-0.007736206,0.01977539,0.020935059,0.024108887,-0.026473999,0.018692017,0.017059326,-0.03604126,-0.019180298,-0.032287598,0.05218506,0.00793457,0.015556335,0.018951416,0.00057935715,0.0104599,-0.04660034,-0.0028266907,0.008010864,0.0059165955,-0.015403748,-0.05178833,-0.04360962,-0.0043563843,0.019348145,0.0034675598,0.014930725,0.024871826,-0.000082433224,-0.01096344,0.021743774,0.0039482117,-0.00504303,-0.01134491,-0.04269409,-0.006252289,0.0023651123,-0.001420021,-0.02659607,0.018005371,-0.012573242,-0.018112183,-0.009277344,-0.017562866,-0.00083494186,-0.010192871,0.008781433,0.04257202,0.005012512,0.011489868,-0.013282776,-0.021987915,-0.0039634705,0.004501343,0.028137207,-0.033355713,0.025680542,-0.00071525574,0.005264282,-0.016937256,0.011352539,0.010482788,0.016662598,0.003238678,0.031051636,-0.025909424,0.035064697,-0.010719299,0.010147095,-0.00085401535,-0.02279663,-0.0028972626,-0.015625,-0.015731812,0.03591919,-0.020141602,-0.01576233,-0.018432617,-0.020019531,0.0036201477,-0.035614014,0.013755798,0.029525757,0.035339355,-0.03100586,0.013053894,0.023406982,0.005947113,-0.013458252,-0.008621216,-0.0061531067,0.021820068,0.028060913,-0.0054969788,-0.026412964,-0.015945435,-0.011131287,-0.008224487,-0.044555664,-0.058685303,-0.01852417,0.009231567,0.005947113,-0.010520935,-0.036346436,-0.028900146,0.002073288,-0.034820557,0.022857666,-0.0076026917,0.015914917,0.0016002655,-0.034484863,0.00033450127,0.022598267,-0.019088745,0.025756836,0.00071811676,-0.0060691833,-0.048797607,0.007980347,0.041137695,0.013381958,-0.0034008026,-0.029647827,0.0023880005,-0.039276123,-0.06341553,-0.011856079,-0.02319336,0.010131836,-0.00091791153,0.009391785,-0.052215576,0.004333496,-0.016723633,-0.009124756,0.012321472,0.0065956116,-0.005592346,-0.009056091,0.010505676,-0.009140015,-0.016433716,-0.03125,0.0033912659,0.011947632,-0.00630188,0.021011353,0.048553467,-0.00016820431,-0.016326904,0.01725769,0.003780365,0.019363403,-0.020935059,0.004146576,-0.021194458,0.007007599,-0.005332947,-0.016067505,-0.04058838,-0.01461792,0.07324219,0.009254456,0.017715454,-0.014709473,-0.0060691833,0.013336182,0.03805542,-0.044525146,-0.0059165955,-0.025375366,0.025283813,-0.021881104,0.02583313,0.0018291473,0.017745972,-0.020935059,-0.049682617,-0.0031051636,0.0135269165,0.004398346,-0.048095703,-0.012619019,-0.054718018,-0.00038933754,-0.028747559,-0.029388428,-0.001657486,0.000538826,-0.02015686,-0.08892822,0.0063591003,0.05731201,-0.000011384487,0.022064209,-0.006668091,0.0152282715,0.026031494,-0.008056641,-0.0034370422,0.017440796,-0.024276733,-0.016921997,-0.024993896,0.039978027,0.008415222,-0.02003479,0.030700684,0.0034732819,0.029449463,-0.01272583,0.022491455,-0.018707275,0.021713257,-0.004486084,0.018859863,-0.010307312,-0.0102005005,0.022598267,-0.04827881,0.027572632,0.016113281,0.004627228,-0.013008118,0.025772095,0.022827148,-0.035736084,-0.020553589,0.030166626,-0.003967285,0.022750854,-0.02758789,0.04144287,0.002521515,-0.015731812,0.011558533,-0.008277893,-0.01939392,-0.02470398,-0.03479004,0.024658203,0.0073623657,0.008705139,-0.004421234,-0.006340027,0.021408081,0.0027256012,0.009315491,-0.018218994,-0.007511139,-0.013084412,0.0033340454,0.0013380051,0.0037059784,0.00969696,0.02670288,0.037384033,0.02633667,-0.012199402,-0.014083862,0.0038032532,0.02633667,0.0032901764,0.0022945404,0.019332886,0.022338867,0.010795593,0.009506226,0.016967773,-0.036254883,-0.01348114,-0.00705719,-0.0048828125,0.007587433,-0.01423645,0.0050621033,0.0044021606,-0.0029182434,-0.0034236908,-0.047088623,0.01071167,-0.03125,-0.029067993,0.003753662,-0.0079574585,0.021835327,0.010726929,0.0026130676,0.0019140244,0.007911682,0.045440674,-0.0036735535,-0.01637268,0.036468506,0.02784729,0.01777649,-0.037841797,-0.015686035,0.008102417,0.0024356842,-0.0031547546,-0.024765015,0.0029182434,0.03543091,-0.014709473,0.018630981,-0.027664185,0.027374268,0.0012388229,0.0124053955,-0.007827759,0.01576233,-0.01940918,0.02961731,-0.038146973,0.0140686035,0.03692627,0.006439209,-0.015838623,-0.035247803,-0.037261963,0.022659302,0.0042152405,-0.014221191,0.052459717,0.0055236816,0.024215698,-0.019012451,-0.025634766,0.0014591217,-0.030670166,-0.021896362,0.030029297,-0.0046920776,0.0039863586,0.018630981,-0.022720337,0.020141602,-0.036743164,0.005126953,0.015335083,-0.003818512,-0.02192688,-0.015350342,-0.00605011,0.009208679,-0.018722534,-0.0020542145,0.002861023,0.046783447,0.03643799,0.040252686,0.020446777,0.011619568,0.008331299,-0.049041748,-0.026885986,0.003993988,-0.029449463,0.014884949,-0.02217102,0.04675293,0.04458618,-0.0047035217,0.02432251,0.048736572,0.040802002,-0.014724731,0.018371582,-0.014442444,0.01890564,-0.014381409,0.026184082,-0.0017910004,0.04788208,-0.039398193,0.008285522,0.020019531,0.010536194,-0.023834229,0.034484863,0.074035645,0.030807495,-0.0004529953,0.017456055,-0.0051078796,-0.009460449,-0.0119018555,-0.017211914,0.044311523,0.023147583,0.054901123,0.024627686,0.0076904297,-0.009284973,0.025146484,-0.023544312,-0.027175903,0.04147339,0.03491211,-0.018325806,0.00047540665,-0.0073432922,-0.00021803379,-0.04916382,-0.017608643,0.025924683,0.010864258,0.0077705383,-0.005088806,0.0030384064,-0.00806427,0.023269653,0.014259338,0.0034046173,0.002199173,0.025878906,0.013130188,0.0023937225,0.034362793,0.013626099,0.027145386,-0.030929565,-0.011520386,0.016204834,0.011871338,-0.0056114197,0.002614975,0.033935547,0.015380859,0.03555298,0.03086853,-0.023391724,-0.0035171509,0.014442444,0.0073165894,0.013381958,0.060150146,0.019012451,0.009361267,0.029418945,0.0357666,0.017333984,-0.018463135,0.012939453,-0.004463196,0.009094238,-0.0041656494,-0.022994995,0.008491516,0.0008854866,0.022781372,0.01108551,-0.013183594,0.01335907,0.016494751,0.0012617111,0.0035552979,-0.0051345825,0.009765625,-0.010421753,-0.005393982,0.015434265,-0.020339966,0.017333984,0.0046424866,0.026168823,-0.028030396,0.015068054,0.0031261444,-0.018417358,0.0010576248,0.027420044,-0.03982544,0.006969452,0.005252838,-0.016204834,-0.044189453,0.0060043335,0.017974854,-0.01197052,0.024429321,0.01449585,-0.015991211,0.0071258545,0.020507812,0.014877319,-0.0023612976,-0.0134887695,-0.027069092,0.014137268,0.043640137,0.008575439,0.0017490387,-0.030212402,-0.0035953522,0.012664795,-0.013793945,-0.008712769,0.014633179,0.0016431808,-0.047912598,0.018157959,0.036376953,0.016845703,0.018218994,-0.0074386597,-0.018951416,-0.0055503845,0.027862549,0.012451172,0.0075950623,-0.010658264,0.02192688,-0.010635376,0.04824829,0.044830322,0.000023663044,0.037750244,-0.013900757,-0.006767273,-0.0054244995,-0.025100708,0.007144928,-0.028305054,-0.0034370422,-0.010856628,0.028717041,-0.015296936,-0.028503418,0.0008583069,-0.008255005,-0.018798828,-0.014167786,0.022262573,0.002784729,0.028060913,0.03945923,0.01272583,-0.03451538,0.07171631,-0.01713562,0.04333496,-0.0077590942,-0.007171631,0.061187744,0.042144775,0.033447266,0.011619568,0.0082473755,-0.031188965,0.00856781,0.032684326,0.033691406,0.019180298,0.000003874302,-0.016143799,0.03857422,-0.011779785,0.021438599,-0.003967285,-0.0024261475,0.009933472,-0.014945984,-0.0068893433,-0.002204895,0.0032615662,0.012969971,0.049926758,-0.024002075,-0.006866455,-0.01914978,-0.020431519,0.03878784,-0.007534027,-0.012931824,-0.014518738,-0.017181396,0.011192322,-0.018447876,-0.015838623,0.01838684,0.02545166,-0.05001831,-0.019180298,0.017456055,0.017364502,-0.029205322,0.040283203,0.01638794,-0.01007843,0.023788452,0.040985107,-0.009109497,0.02357483,-0.017303467,0.03793335,0.060272217,0.008888245,-0.010322571,0.00031542778,0.002243042,-0.008804321,0.009765625,0.029067993,0.001786232,0.00065660477,0.0015649796,-0.016616821,0.0055351257,0.017868042,-0.02017212,0.0053977966,-0.018493652,-0.017456055,0.008964539,0.019210815,0.0124053955,0.009666443,-0.0079574585,-0.007980347,0.007041931,0.051116943,0.023239136,-0.038024902,-0.0005092621,0.010429382,0.014305115,-0.0262146,-0.0073623657,-0.018737793,-0.027313232,0.011619568,0.031982422,0.0058021545,0.011428833,-0.02029419,0.001868248,0.041381836,0.007980347,-0.0020256042,0.013061523,-0.01361084,0.013900757,-0.018859863,0.002954483,-0.015136719,0.005126953,0.005153656,0.009391785,-0.017074585,-0.021774292,0.022872925,-0.0036239624,0.012901306,-0.013664246,-0.0020160675,0.031051636,0.0024719238,-0.019866943,0.0024375916,0.011764526,-0.015838623,-0.011581421,-0.030456543,0.011787415,0.04928589,-0.00680542,-0.0022068024,0.007827759,0.02357483,0.027236938,0.041748047,0.0007457733,0.038635254,0.018203735,-0.027069092,-0.029037476,0.017990112,-0.010444641,-0.02999878,0.025894165,-0.021453857,-0.023101807,0.01777649,-0.00036025047,-0.0018453598,-0.023986816,-0.013961792,-0.020462036,-0.025314331,0.022415161,-0.015808105,0.013389587,-0.019836426,-0.0076828003,0.020050049,-0.02722168,-0.036987305,-0.023635864,0.00029563904,-0.020858765,-0.066101074,0.013923645,-0.019729614,0.015716553,-0.009773254,-0.0023670197,-0.010597229,0.03692627,-0.010040283,-0.0027236938,0.0036849976,0.036590576,0.007221222,0.018630981,0.021713257,-0.029800415,-0.035491943,-0.009468079,0.00434494,-0.012619019,0.012123108,-0.008476257,0.035980225,-0.00032925606,-0.016601562,0.004425049,-0.0132369995,-0.0014619827,-0.016571045,-0.027328491,-0.030136108,0.0149002075,0.032928467,-0.002773285,0.0011072159,0.04901123,-0.0017824173,-0.004840851,0.014823914,0.025802612,0.013015747,0.029907227,-0.010757446,-0.008682251,-0.028747559,0.0126571655,-0.01739502,0.009223938,0.013641357,0.002281189,-0.016403198,0.013458252,0.02999878,-0.012306213,0.0017709732,0.023284912,-0.0024280548,-0.019210815,0.029418945,0.007762909,-0.00015878677,-0.014831543,-0.011756897,0.023422241,0.062561035,0.016418457,0.0012874603,-0.0064697266,0.0035247803,-0.0078125,-0.007083893,0.0107421875,-0.032165527,-0.029556274,-0.0231781,-0.02658081,0.020309448,-0.00034451485,0.011459351,-0.004348755,0.016082764,-0.01461792,-0.01953125,-0.014984131,0.03930664,-0.008522034,-0.012336731,0.00030183792,0.011627197,0.01423645,-0.030075073,-0.0020999908,-0.039916992,-0.043884277,-0.021408081,-0.01423645,0.03173828,0.003868103,-0.010070801,0.0030403137,0.0026893616,-0.007347107,0.011405945,0.0284729,-0.013130188,-0.010009766,0.007835388,0.010429382,-0.029510498,0.018615723,-0.010620117,-0.020767212,0.008110046,-0.006679535,0.022140503,-0.015052795,0.029586792,0.019729614,-0.00982666,0.031463623,0.008560181,0.012992859,-0.019332886,0.0048294067,-0.007797241,-0.011238098,0.035369873,-0.0068359375,-0.018157959,-0.004940033,-0.014709473,-0.02180481,0.015014648,0.021209717,0.01966858,-0.013092041,0.037261963,-0.025268555,-0.0067367554,0.018325806,0.010040283,-0.02507019,0.000187397,0.04135132,0.00023794174,-0.004890442,-0.0013332367,-0.0005249977,-0.030975342,-0.008415222,0.0061950684,-0.0016088486,-0.01348114,0.015205383,-0.003004074,0.03930664,-0.013069153,0.0076828003,0.025680542,0.013366699,0.03062439,0.00655365,0.02986145,0.002456665,-0.022537231,-0.009513855,0.0076141357,-0.026565552,-0.0009832382,-0.0040130615,0.012763977,-0.039611816,0.009140015,0.007286072,0.033813477,-0.014968872,0.010971069,-0.02709961,-0.00315094,-0.027786255,0.006904602,-0.042175293,0.0047721863,0.04333496,0.021865845,0.021713257,-0.004322052,-0.033599854,0.04034424,0.04638672,0.01222229,-0.031173706,-0.01574707,0.0018358231,-0.0024547577,-0.0038280487,0.0059165955,-0.025772095,-0.024047852,-0.012924194,-0.01739502,-0.008125305,-0.009864807,0.018035889,0.0116119385,-0.0016431808,-0.00258255,0.012466431,-0.0006608963,-0.0077590942,-0.0034275055,-0.0057144165,0.019714355,0.032318115,-0.0031108856,0.020553589,0.034057617,-0.042907715,0.058410645,-0.007232666,0.02508545,-0.017822266,0.017349243,-0.03152466,-0.020629883,-0.008544922,0.0032978058],"createdAt":"2026-04-21T18:32:21.834Z","updatedAt":"2026-04-22T05:32:10.230Z","lastSeenAt":"2026-04-22T05:32:10.230Z","tsv":"'/api':220 '/api/v1/inbox/161':122,189 '/pricing':221 '/readme':223 '/request':17,34 '0.02':16,33,104,149 '000':138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':160 '0x8335':143 '20':137 '2913':144 '300':163 '402 payment endpoint' '6':147 'Base USDC API' 'accept':168 'access':127,196 'across':183 'actual':207 'addit':235 'address':159 'advertis':61 'ai':10,27,73 'analysi':77 'analyt':67 'api':4,21,41,65,109,126,195 'application/json':173 'avail':218 'base':7,24,57,139,146 'base-network' 'behind':49 'categori':63,185 'challeng':133 'classif':80 'collect':46 'commit':117 'connect':230 'convers':97 'crypto-gated API' 'data':9,26,66,70,203 'decim':148 'describ':192 'document':200,236 'embed':81 'endpoint':14,31,48,100,120,167,182,188 'estim':91 'exact':152 'exampl':216 'exchang':86 'export':71 'feed':85 'financ':11,28,82 'four':62 'function':205 'gas':90 'gate':3,20,44 'generat':98 'generic':191 'geocod':95 'http':169 'http-post' 'infrastructur':93 'insight':72 'json-response' 'key':110 'label':124 'land':178 'learn':75 'limit':113 'list':102,180 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':74 'mani':181 'marketplac':42 'metric':68 'micropay':54 'micropayment API' 'minim':229 'minimum':116 'multipl':184 'network':58 'no-api-key' 'note':174 'offer':8,25 'openapi':210 'page':179,224 'pay-per-request API' 'payment':153,155 'per':51,105 'per-request':50 'per-request-billing' 'platform':5,22,60 'post':170 'premium':125,194 'price':84 'probe':187 'prompt':232 'protocol':40 'quot':89 'rate':87,112 'report':69 'request':52,106,134 'request/response':212 'resolv':226 'return':129,172,208 'schema':213 'scheme':154 'second':164 'sent':157 'sentiment':76 'spec':211 'specif':119 'summar':79 'text':78 'timeout':165 'token':88 'unit':140 'usag':215 'usdc':53,142 'usdc-micropayment' 'util':13,30,94 'valid':96,131 'via':150 'wallet':231 'web3':83 'x402':2,19,39,132 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"f45a78b0-9424-4963-93b0-6d1e70ef806c","listingId":"ba9606b7-14de-4898-a3e7-e69355f03742","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/inbox/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.834Z"}],"sources":[{"listingId":"ba9606b7-14de-4898-a3e7-e69355f03742","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.834Z","lastSeenAt":"2026-04-22T05:32:10.230Z"}],"details":{"listingId":"ba9606b7-14de-4898-a3e7-e69355f03742","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/161 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 at /api/v1/inbox/161 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/161"}],"useCases":["Accessing gated API services with per-call USDC micropayments on Base","Programmatic pay-as-you-go API consumption without API key management","Agent-driven workflows that need instant, keyless API access settled on-chain"],"bestFor":["Developers wanting no-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost ($0.02) per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput batch processing where per-call crypto settlement adds latency","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.372Z"},"updatedAt":"2026-04-22T05:32:10.230Z"}}