{"id":"56d37fda-3de8-47b0-99a1-046ff38e93df","shortId":"pE8Str","kind":"x402","title":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","tagline":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/keys/68` is listed as \"Premium API Access\" and costs up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.\n\nThe broader platform advertises endpoints across four 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 listed at the same $0.02/request price point and settle in USDC on Base.\n\nThis particular endpoint (`/api/v1/keys/68`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond the title. The probe confirms it is live (returns a valid x402 402 challenge), accepts POST requests, and returns application/json. However, no OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The endpoint's concrete behavior — what data it returns or what input it expects — remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation found for the specific endpoint /api/v1/keys/68 — its actual functionality is unknown","No OpenAPI or schema available; request and response formats are undocumented","The /api, /pricing, and /README pages returned no meaningful content (just 'Connect wallet')","The label 'Premium API Access' is generic and does not describe what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/68","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what 'Premium API Access' actually does. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful content. 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":"2026-04-21T22:24:26.074Z","embedding":[-0.019165039,-0.013366699,0.041778564,0.004600525,0.03439331,-0.035980225,-0.02784729,0.046142578,0.057769775,-0.083618164,0.028778076,-0.04473877,-0.030029297,-0.037384033,-0.045410156,0.010040283,-0.026229858,-0.00077199936,-0.049468994,0.027526855,0.036987305,-0.026870728,-0.016189575,0.03225708,-0.0002822876,-0.024475098,-0.0178833,-0.022247314,-0.0045051575,-0.04144287,0.03967285,-0.03262329,-0.026062012,0.017089844,-0.021408081,-0.020523071,-0.0052871704,0.030181885,0.021148682,-0.01335907,-0.010803223,-0.061645508,-0.0082473755,-0.004470825,-0.052368164,-0.00042152405,-0.014198303,-0.029937744,-0.019042969,-0.0059928894,-0.024887085,-0.014198303,-0.011772156,-0.012588501,0.010574341,0.010185242,-0.013305664,-0.022750854,0.0135269165,0.015213013,0.0062026978,-0.049346924,-0.006122589,-0.009750366,0.0067825317,0.057769775,-0.01727295,0.05340576,0.020507812,0.049560547,0.046325684,0.062286377,0.014808655,0.017242432,-0.011650085,-0.0079422,0.0010585785,0.06719971,-0.01109314,-0.012001038,-0.022521973,-0.0132369995,-0.020446777,-0.008491516,-0.007598877,-0.04977417,-0.02394104,0.0025749207,-0.014129639,0.019821167,-0.08001709,-0.009284973,-0.007713318,0.004764557,0.01737976,-0.0046310425,-0.027328491,0.030212402,-0.014213562,0.017944336,0.00013744831,-0.045562744,0.002773285,0.0090789795,0.037353516,0.06744385,0.014213562,0.035736084,0.00605011,-0.029388428,-0.040527344,0.0010738373,-0.031143188,-0.016677856,0.014282227,-0.0051078796,-0.023788452,0.009925842,-0.035614014,0.008934021,-0.04876709,0.04071045,0.023544312,-0.018325806,0.005306244,-0.04724121,-0.00070667267,0.008056641,-0.027435303,-0.02532959,0.0014505386,0.011306763,0.034698486,-0.010879517,-0.035461426,0.010147095,-0.008125305,-0.030319214,-0.051757812,-0.031555176,0.033843994,-0.038513184,0.028564453,0.033599854,-0.11212158,-0.013999939,-0.048065186,0.013771057,-0.027542114,0.011329651,0.008895874,0.025268555,-0.008781433,-0.0046806335,-0.013534546,-0.025360107,0.0104904175,0.027999878,-0.021606445,0.062347412,-0.012252808,0.042388916,0.023620605,0.020370483,0.0259552,0.041992188,0.013656616,-0.06829834,-0.07348633,-0.012336731,-0.0058174133,-0.0154418945,-0.023651123,0.028289795,-0.023239136,-0.058929443,-0.025390625,-0.012016296,-0.003042221,-0.04348755,-0.010772705,-0.025726318,0.016616821,0.0028896332,-0.05886841,-0.009864807,-0.010612488,0.06793213,0.012138367,0.014076233,0.03390503,-0.018722534,0.06750488,0.023910522,-0.018234253,-0.043518066,0.015777588,-0.021606445,0.013557434,-0.006084442,0.0067634583,-0.036834717,0.036712646,0.054626465,0.026443481,-0.017959595,-0.009506226,-0.054718018,-0.04647827,-0.042236328,0.016357422,0.008102417,0.010353088,0.02909851,-0.028244019,-0.025299072,0.012550354,0.011245728,0.01512146,0.06878662,-0.006072998,-0.014770508,0.011177063,0.024169922,-0.042877197,0.046142578,0.037017822,0.016540527,-0.030181885,-0.028289795,0.015914917,0.028045654,-0.027435303,0.001868248,-0.017623901,0.029251099,-0.0055160522,0.007133484,0.018295288,-0.02357483,-0.004852295,-0.032073975,-0.025939941,0.032409668,-0.0043907166,-0.015701294,-0.027755737,-0.07183838,0.040039062,0.037017822,0.042755127,-0.009635925,0.012168884,-0.032958984,-0.020629883,-0.0635376,0.04788208,0.07525635,-0.011268616,-0.009254456,0.020706177,-0.02243042,-0.032073975,-0.0020332336,-0.014335632,-0.02784729,-0.009788513,0.012840271,-0.041992188,-0.003364563,0.00919342,0.03793335,0.05935669,-0.010986328,-0.050842285,-0.029785156,0.0022144318,0.00061893463,-0.022521973,-0.013893127,0.0030879974,0.002588272,0.038269043,-0.019943237,0.021621704,-0.0019664764,0.022521973,-0.0012722015,-0.0079422,-0.016937256,-0.028396606,0.02609253,0.024795532,-0.06149292,0.0037822723,-0.0061149597,0.057159424,-0.04888916,0.02645874,-0.01789856,0.011001587,0.041046143,0.002117157,-0.046936035,0.0022640228,0.031143188,0.0211792,0.04751587,0.009864807,-0.026901245,-0.007286072,0.08538818,-0.029205322,-0.029708862,0.005004883,0.0118255615,0.033111572,-0.0025863647,-0.05078125,-0.032806396,-0.010299683,-0.03616333,0.013069153,-0.032562256,0.020446777,-0.009811401,0.0016212463,-0.022460938,0.020370483,-0.03050232,0.02986145,-0.020858765,0.0063095093,-0.016571045,-0.01600647,-0.0076408386,0.0060424805,-0.0018949509,0.0020713806,0.040649414,0.01991272,-0.002576828,-0.032043457,-0.027496338,-0.011459351,0.007381439,0.027862549,0.02420044,0.021224976,0.04876709,-0.018371582,0.020584106,0.027389526,0.03805542,0.02949524,-0.019515991,0.009552002,-0.047302246,-0.047668457,-0.023757935,-0.027130127,0.028045654,-0.00004208088,0.0019550323,0.06036377,-0.0016298294,-0.023986816,-0.053222656,0.033050537,-0.03302002,-0.007965088,0.037231445,-0.019088745,-0.046966553,0.011009216,0.002981186,0.003047943,0.037139893,0.027328491,0.01234436,0.07092285,0.045959473,-0.008804321,0.013534546,0.0030822754,0.016830444,0.013694763,-0.028503418,-0.03173828,0.00075626373,0.018920898,-0.018920898,-0.020095825,-0.077697754,0.059143066,0.047576904,0.07977295,0.012229919,0.009361267,0.051574707,-0.021652222,0.024169922,-0.021270752,0.004211426,-0.020507812,-0.053375244,0.021636963,-0.008026123,-0.0010356903,-0.040924072,0.044311523,0.007358551,0.025726318,-0.045135498,0.054779053,0.0032920837,-0.010551453,0.027252197,0.003019333,0.03829956,0.074279785,-0.049560547,0.021972656,0.040222168,-0.027740479,0.014442444,0.05078125,-0.018188477,-0.0058631897,-0.053375244,-0.025238037,-0.009086609,-0.008888245,-0.054229736,-0.0010414124,0.010719299,0.025619507,0.03527832,-0.01637268,-0.017440796,-0.006549835,-0.025375366,-0.05203247,0.006652832,-0.04458618,0.006832123,0.04864502,-0.042114258,-0.0138168335,0.003967285,-0.015670776,-0.0090789795,0.0078125,0.012313843,0.0052833557,-0.038482666,0.028076172,0.014076233,0.00047278404,0.005832672,0.020462036,0.012916565,0.023147583,0.029708862,0.013084412,-0.019363403,-0.0625,0.022125244,-0.0418396,0.011459351,0.019378662,-0.026901245,-0.0063285828,-0.010505676,-0.016204834,-0.031066895,0.012893677,-0.0284729,-0.0034160614,0.024368286,-0.03326416,-0.0033607483,-0.045440674,-0.018554688,-0.0050621033,0.06890869,0.03994751,0.004032135,-0.04248047,-0.006252289,0.0053596497,0.011833191,0.024261475,-0.0154418945,0.0037631989,-0.0025672913,-0.009689331,-0.013092041,-0.0054473877,0.016113281,-0.009643555,-0.013053894,0.031433105,0.014183044,0.0036392212,0.014373779,0.0135269165,0.026779175,-0.019241333,-0.006839752,-0.0135269165,0.033355713,-0.0008559227,-0.008651733,-0.044830322,0.03579712,0.0060157776,0.037506104,-0.035247803,-0.010627747,-0.009338379,0.011978149,0.0048103333,-0.006881714,-0.01108551,-0.00919342,-0.048187256,-0.07086182,0.052856445,-0.019515991,0.030715942,0.003396988,0.017425537,0.015853882,-0.001876831,-0.015235901,0.029144287,-0.025054932,-0.014144897,-0.017990112,-0.032104492,-0.019454956,-0.0018968582,-0.01878357,0.014175415,-0.023544312,0.021026611,-0.0038032532,-0.027572632,0.016525269,0.0062789917,-0.002691269,0.020050049,0.007801056,0.024780273,0.050811768,0.005104065,-0.033447266,0.023666382,0.012512207,0.014343262,0.008300781,0.04067993,0.03326416,-0.0116119385,-0.0009498596,0.006793976,-0.020095825,-0.0050354004,0.003583908,0.01737976,0.021713257,-0.008369446,-0.036102295,0.026351929,0.009559631,-0.024810791,-0.018676758,0.026000977,0.019714355,-0.03366089,0.027709961,0.03363037,0.06549072,-0.024139404,0.004837036,0.016464233,0.034942627,0.010864258,0.0129470825,-0.01259613,0.010406494,-0.015449524,0.0068588257,-0.0046539307,0.009437561,0.022735596,-0.003540039,0.009719849,0.023040771,0.0021762848,-0.012954712,-0.03366089,0.005176544,-0.0209198,-0.012084961,0.011123657,0.022750854,0.031143188,-0.021209717,0.022323608,0.024169922,-0.024383545,-0.018127441,-0.015602112,0.037078857,-0.020004272,-0.01638794,0.0075912476,0.009483337,0.039642334,-0.046905518,-0.013160706,0.022323608,0.008232117,-0.021514893,-0.045715332,-0.036376953,0.0058250427,0.047088623,-0.0013389587,0.015396118,0.02949524,0.0077056885,0.0020580292,0.025939941,-0.004386902,-0.021865845,-0.0054130554,-0.023712158,-0.008255005,-0.0009422302,-0.0015506744,-0.030029297,0.010467529,-0.015090942,-0.03378296,0.013015747,-0.009750366,-0.007633209,-0.008956909,0.009613037,0.036499023,0.0012197495,0.010864258,-0.02532959,-0.036468506,-0.000082433224,0.0112838745,0.012504578,-0.043792725,0.021896362,-0.017333984,-0.01663208,-0.0033054352,0.014984131,0.008956909,0.027999878,0.011482239,0.029968262,-0.05078125,0.0423584,-0.026168823,0.0039596558,-0.0024414062,-0.027633667,0.001001358,-0.017715454,-0.023849487,0.049987793,-0.021469116,-0.0045318604,-0.02520752,-0.031280518,-0.004463196,-0.054626465,0.023345947,0.034606934,0.031311035,-0.022506714,0.00010716915,-0.0024757385,-0.0037765503,-0.01802063,0.0131073,-0.010047913,0.012969971,0.025268555,-0.0068588257,-0.032287598,-0.02142334,-0.017196655,-0.017410278,-0.040649414,-0.056365967,-0.011833191,0.018417358,-0.005126953,0.00048279762,-0.030456543,-0.03265381,0.011711121,-0.044647217,0.0135650635,0.012672424,0.003753662,-0.012710571,-0.026611328,0.01651001,0.02671814,-0.026382446,0.04296875,0.014854431,-0.016601562,-0.028457642,0.012512207,0.036132812,0.025817871,-0.007785797,-0.0032615662,-0.011505127,-0.016525269,-0.0519104,-0.01209259,-0.0051994324,-0.0008649826,0.00459671,0.010017395,-0.045959473,-0.011222839,-0.017715454,-0.0058059692,0.02960205,0.024383545,0.00340271,0.0062179565,0.010864258,-0.0058135986,-0.0065612793,-0.03302002,0.009773254,0.011161804,-0.0055160522,0.022903442,0.0463562,0.011276245,-0.0116119385,0.00434494,0.0031929016,0.034576416,-0.011039734,-0.0056266785,-0.02041626,0.004432678,-0.013595581,-0.019348145,-0.033294678,-0.018310547,0.09460449,0.007820129,-0.015914917,-0.010627747,-0.020080566,0.007080078,0.026794434,-0.040863037,0.0020179749,-0.03225708,0.02645874,-0.016189575,0.023849487,0.00598526,0.0006542206,-0.020904541,-0.06048584,-0.00207901,-0.0034828186,-0.014640808,-0.05505371,-0.019515991,-0.049438477,-0.0051231384,-0.015975952,-0.026306152,-0.006122589,0.008102417,-0.01651001,-0.09954834,0.0011978149,0.057495117,0.013931274,0.015586853,-0.012298584,0.010810852,0.022644043,-0.04711914,-0.0063209534,0.025283813,-0.025924683,-0.018722534,-0.010040283,0.021942139,-0.014801025,-0.017913818,0.023651123,-0.0030231476,0.024276733,0.0039749146,0.005332947,-0.02166748,0.008026123,-0.022018433,0.01235199,-0.012863159,-0.00040745735,0.034240723,-0.050842285,0.011726379,0.021850586,0.0051231384,0.004940033,0.028366089,0.031341553,-0.04437256,-0.021835327,0.023208618,-0.009399414,0.029968262,-0.03741455,0.038146973,0.013244629,-0.01890564,0.025726318,-0.008110046,-0.018859863,-0.036712646,-0.026870728,0.033996582,0.0038871765,0.013877869,-0.011276245,-0.0013418198,0.026916504,0.0055007935,0.01663208,-0.017608643,-0.023483276,-0.017349243,-0.007598877,0.01020813,0.00067186356,-0.0019874573,0.025726318,0.020141602,0.029174805,0.013473511,-0.0025939941,0.009689331,0.01802063,-0.010955811,-0.0002040863,0.014251709,-0.00047659874,0.012199402,0.0126953125,0.0037956238,-0.03729248,0.0001718998,-0.031204224,-0.023330688,0.0023727417,-0.006801605,-0.0140686035,-0.021743774,0.013069153,-0.0047950745,-0.033843994,0.006893158,-0.040008545,-0.026489258,0.0034866333,-0.019744873,0.01713562,-0.0010614395,0.015129089,0.015701294,0.007507324,0.05316162,0.013046265,-0.00079345703,0.02609253,0.030929565,0.0107040405,-0.025726318,0.00006335974,-0.0181427,0.00047707558,0.00522995,-0.027633667,0.014625549,0.037261963,-0.01600647,0.007724762,0.008255005,0.019561768,-0.028030396,0.00018274784,-0.0052833557,0.019897461,-0.019470215,0.039276123,-0.030960083,0.013931274,0.0072669983,0.0046577454,-0.008514404,-0.01423645,-0.03125,0.004787445,0.0007033348,-0.025436401,0.048828125,-0.0066986084,0.022216797,-0.01890564,-0.015586853,0.010406494,-0.034301758,-0.021713257,0.04058838,0.007457733,-0.008857727,0.007293701,-0.025436401,0.043548584,-0.034088135,0.01499939,0.00831604,-0.00983429,-0.012710571,-0.018096924,-0.01953125,-0.007965088,-0.004753113,0.0069122314,0.002916336,0.046569824,0.036956787,0.033172607,0.053710938,0.002023697,-0.014640808,-0.034179688,-0.023101807,0.002023697,-0.019210815,0.030532837,-0.0051002502,0.05593872,0.032165527,0.010147095,0.028396606,0.03387451,0.017807007,0.0025482178,0.01322937,-0.017456055,0.00756073,0.005142212,0.028289795,-0.0014667511,0.038391113,-0.0284729,0.014533997,0.014839172,0.02557373,-0.024871826,0.03652954,0.07220459,0.029037476,-0.020263672,0.039886475,-0.006263733,-0.009010315,-0.024307251,-0.016113281,0.057495117,0.0010004044,0.04876709,0.05154419,0.011886597,0.010643005,0.029067993,-0.027542114,-0.023895264,0.06774902,0.02468872,-0.0146102905,-0.0048103333,-0.017074585,0.00039744377,-0.04812622,-0.031143188,0.011245728,-0.0031776428,0.018295288,-0.00548172,-0.007671356,-0.01209259,0.003610611,0.030029297,0.006214142,-0.009757996,0.029144287,0.025985718,-0.0038337708,0.019317627,0.0049591064,0.02835083,-0.040802002,-0.021881104,0.016555786,0.016036987,-0.002067566,-0.00920105,0.01525116,0.019088745,0.056365967,0.052246094,-0.017929077,0.026535034,0.038238525,0.0138168335,0.008392334,0.05493164,0.039398193,0.016143799,0.032104492,0.037719727,0.035064697,-0.040924072,0.006778717,0.008850098,-0.0026111603,-0.00018370152,-0.014572144,-0.00028920174,-0.017852783,0.0101623535,-0.0043258667,-0.0126571655,0.03036499,0.016174316,0.0010871887,0.0054473877,-0.0016613007,0.0061302185,-0.005466461,0.000086545944,0.0053863525,-0.019210815,0.028884888,0.007259369,0.021652222,-0.015792847,0.026535034,0.005214691,-0.008926392,-0.0069618225,0.01739502,-0.046661377,0.0005502701,0.007965088,0.010498047,-0.042877197,0.014160156,0.024612427,0.003917694,0.035736084,0.017044067,-0.005001068,-0.005455017,0.008514404,0.003314972,-0.014251709,-0.009490967,-0.026062012,0.021255493,0.038482666,0.0047073364,0.01763916,-0.011779785,0.001917839,0.003162384,-0.010688782,0.0068473816,-0.009651184,-0.02293396,-0.025344849,0.011146545,0.043823242,0.020950317,0.043426514,-0.012336731,-0.014808655,0.009521484,0.028152466,0.0038661957,0.012710571,-0.014038086,0.020767212,0.0009651184,0.0519104,0.031341553,0.019897461,0.02015686,-0.027740479,-0.023544312,0.009361267,-0.00031375885,0.023483276,-0.012298584,0.014587402,-0.000087320805,0.02671814,-0.016937256,-0.034576416,0.0043296814,-0.014961243,-0.008155823,-0.02607727,0.011512756,0.014915466,0.022857666,0.044403076,0.027999878,-0.025177002,0.066223145,-0.0070266724,0.05706787,-0.025009155,-0.020339966,0.03427124,0.029815674,0.027267456,0.014877319,0.016845703,-0.024490356,0.012428284,0.050323486,0.030029297,0.0057868958,0.008117676,-0.026473999,0.031402588,0.011886597,0.030029297,-0.011619568,0.0020332336,0.008018494,-0.0029830933,-0.014213562,0.001159668,-0.011276245,-0.005847931,0.046539307,-0.038757324,-0.017150879,-0.021438599,-0.024902344,0.023849487,-0.022384644,0.006515503,-0.000114917755,-0.023773193,0.012138367,-0.027786255,-0.018676758,-0.008529663,0.023788452,-0.033081055,-0.017578125,-0.0032444,0.02532959,-0.01739502,0.022918701,0.01802063,-0.01158905,0.0040512085,0.04196167,-0.007144928,0.027923584,-0.015556335,0.016082764,0.042938232,-0.0010051727,-0.017654419,0.003660202,0.0063934326,-0.01259613,0.00881958,0.02760315,-0.022720337,0.0008997917,0.00573349,-0.019760132,0.006034851,0.006465912,0.0026893616,0.008422852,-0.008903503,-0.010765076,-0.015388489,0.016098022,0.009414673,0.0009860992,-0.011352539,-0.015426636,0.013946533,0.037841797,0.014198303,-0.03842163,-0.0046463013,0.0104599,0.01663208,-0.015396118,-0.010276794,-0.006816864,-0.05316162,0.013130188,0.018203735,0.017700195,0.0073547363,-0.022155762,-0.0015010834,0.030029297,0.018188477,0.022323608,0.0017614365,-0.0059318542,0.02281189,-0.012786865,-0.013641357,-0.009086609,-0.012802124,0.012451172,0.02583313,-0.007949829,-0.028137207,0.029388428,0.00063705444,0.008956909,0.00020837784,-0.024673462,0.021240234,-0.005596161,-0.016723633,0.002878189,0.011299133,-0.016998291,-0.013000488,-0.017364502,0.03262329,0.050567627,-0.0116119385,-0.014663696,0.026290894,0.0103302,0.0132369995,0.040039062,0.0005760193,0.050354004,0.027282715,-0.009857178,-0.025558472,0.021331787,-0.005493164,-0.01852417,0.015357971,-0.0105896,-0.029464722,0.02468872,0.013343811,0.00073575974,-0.03665161,-0.023757935,-0.00008159876,-0.009803772,0.025405884,-0.018997192,0.01360321,-0.023880005,0.0018749237,0.0063972473,0.0010242462,-0.04888916,-0.023269653,0.00084638596,-0.009803772,-0.053985596,0.0084991455,-0.0317688,0.0054092407,-0.020736694,-0.012161255,0.00026631355,0.03540039,-0.0068130493,0.0048561096,0.0211792,0.022735596,0.014038086,0.0030517578,0.028213501,-0.023757935,-0.024887085,-0.027496338,0.014266968,-0.012992859,0.014533997,0.010597229,0.037017822,0.018875122,0.0056762695,-0.0016202927,-0.0015964508,-0.006095886,-0.005958557,-0.016418457,-0.016143799,0.023025513,0.0127334595,-0.007259369,-0.008483887,0.049591064,-0.024139404,-0.0070648193,0.018737793,0.061584473,0.0009851456,0.035827637,-0.004261017,-0.011001587,-0.007987976,0.0032196045,-0.025817871,0.012329102,0.01826477,-0.003692627,0.0028705597,-0.0039596558,0.0054969788,-0.013069153,-0.00894928,0.024749756,-0.0018701553,-0.01058197,0.031982422,0.009666443,0.014228821,-0.019927979,-0.016845703,0.016235352,0.0259552,0.012969971,0.010604858,0.001455307,0.011039734,-0.021896362,0.012756348,0.0009407997,-0.013694763,-0.038208008,-0.017807007,-0.034301758,0.018615723,0.005268097,0.011878967,0.0076942444,0.014228821,-0.012237549,-0.033416748,-0.021957397,0.019729614,0.0012083054,-0.008354187,-0.018463135,0.009841919,0.0126571655,-0.02720642,0.0015420914,-0.030075073,-0.03768921,-0.0041275024,-0.03604126,0.021942139,0.0047035217,-0.009063721,0.0049552917,-0.0012283325,0.0009841919,-0.00072288513,0.027999878,-0.012077332,-0.00037050247,0.014427185,0.019592285,-0.01525116,0.0024490356,-0.021392822,0.0011558533,0.030044556,-0.0029697418,0.017364502,-0.011764526,0.030426025,-0.010826111,-0.014503479,0.021835327,-0.0025424957,0.0113220215,-0.03366089,0.007911682,-0.0019197464,-0.0009126663,0.03765869,-0.025848389,-0.028244019,0.00085926056,-0.018920898,-0.028137207,-0.00022184849,0.025802612,0.039245605,0.00023770332,0.035980225,-0.019546509,0.0005841255,0.019561768,0.0062179565,-0.027542114,-0.0066375732,0.053466797,0.00856781,-0.0025730133,-0.009460449,-0.0075187683,-0.032165527,-0.007205963,0.021728516,-0.0015745163,-0.012641907,0.031036377,0.010643005,0.042785645,0.0036907196,0.009803772,0.009216309,0.008239746,0.01739502,-0.0006451607,0.046203613,0.003168106,-0.019073486,0.010482788,0.0076179504,-0.028778076,-0.0019989014,-0.014877319,-0.0007634163,-0.036590576,0.022506714,-0.011154175,0.023742676,-0.02760315,0.008277893,-0.022964478,-0.018005371,-0.03164673,-0.016067505,-0.027893066,0.0022506714,0.04434204,0.008125305,0.008995056,0.005580902,-0.015037537,0.020248413,0.051208496,-0.0055503845,-0.023956299,-0.009094238,0.007385254,0.0035095215,0.011787415,0.011749268,-0.017868042,-0.01675415,0.001917839,-0.021865845,0.0071525574,0.0031433105,0.00008755922,0.0079574585,-0.009521484,-0.0038166046,0.030853271,-0.00881958,-0.0051193237,0.0026569366,0.008621216,0.05670166,0.02168274,-0.012397766,0.01285553,0.013343811,-0.03326416,0.055145264,-0.0049934387,0.027313232,-0.019348145,-0.0007443428,-0.033447266,-0.018035889,-0.0070877075,0.0075912476],"createdAt":"2026-04-21T18:32:23.748Z","updatedAt":"2026-04-22T01:02:19.165Z","lastSeenAt":"2026-04-22T01:02:19.165Z","tsv":"'/api/v1/keys/68':58,166 '/request':12,29,154 '0.02':11,28,83,153 '000':70 '0x8335':75 '20':69 '2913':76 '402':192 '6':79 'Base network API' 'USDC micropayment API' 'accept':194 'access':6,23,64,171 'account':99 'across':110 'actual':174 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,22,44,63,97,170 'application/json':199 'base':8,25,53,71,78,162 'behavior':218 'beyond':179 'broader':106 'call':4,21 'categori':112 'challeng':193 'classif':127 'collect':38 'concret':217 'confirm':184 'convers':144 'cost':66 'crawl':213 'crypto-paid API' 'data':113,117,220 'decim':80 'detail':207 'document':178,208 'embed':128 'endpoint':45,57,109,147,165,215 'equal':82 'estim':138 'exampl':205 'exchang':133 'expect':227 'export':118 'feed':132 'financ':129 'found':210 'four':111 'function':175 'gas':137 'gate':46 'generat':145 'geocod':142 'header':95 'host':36 'howev':200 'infrastructur':140 'inlin':89 'input':225 'insight':119 'json-response' 'key':16,33,98 'label':168 'learn':122 'limit':102 'list':60,149 'live':187 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'made':88 'metric':115 'network':54 'no-api-key' 'openapi':202 'particular':164 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':86,94 'per':3,20,42,84 'platform':107 'point':156 'post':195 'post-method' 'premium':62,169 'premium API access' 'price':131,155 'probe':183 'protocol':50 'quot':136 'rate':101,134 'remain':228 'report':116 'request':43,85,196 'request/response':204 'requir':17,34,104 'return':188,198,222 'schema':203 'sentiment':123 'settl':158 'specif':56 'summar':126 'text':125 'titl':181 'token':135 'unclear':229 'unit':72 'usdc':14,31,74,160 'usdc-base' 'util':141 'valid':143,190 'via':9,26,90 'web3':130 'x':93 'x-payment':92 'x402':10,27,49,191 'x402 API' 'x402-payment'","prices":[{"id":"a9b53dec-ecbc-46ec-9085-6e7001741172","listingId":"56d37fda-3de8-47b0-99a1-046ff38e93df","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.748Z"}],"sources":[{"listingId":"56d37fda-3de8-47b0-99a1-046ff38e93df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.748Z","lastSeenAt":"2026-04-22T01:02:19.165Z"}],"details":{"listingId":"56d37fda-3de8-47b0-99a1-046ff38e93df","quickStartSnippet":"# Requires an x402-compatible client that can sign USDC payments on Base\ncurl -X POST https://lowpaymentfee.com/api/v1/keys/68 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/68"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/68"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, instant API access without subscriptions","Programmatic access to paid endpoints without account registration"],"bestFor":["Developers who want zero-friction, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.272Z"},"updatedAt":"2026-04-22T01:02:19.165Z"}}