{"id":"367b723a-1f84-46b4-a5a0-587e0728b7b6","shortId":"PWz2HJ","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/383` accepts POST requests and returns JSON. The x402 challenge confirms it is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises a broad suite of sibling endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02/request price point. However, documentation beyond the landing page is extremely sparse (all subpages just show \"Connect wallet\"), so the actual functionality behind this particular `/payments/383` endpoint is unclear. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","post-method"],"categories":["payments","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium access endpoint"],"warnings":["No documentation available — all subpages (docs, api, pricing, README) return only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/payments/383 is undocumented — 'Premium API Access' is the only descriptor","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/383","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/payments/383","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 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually does, no request/response schema, no OpenAPI spec, and all doc pages are empty. The listing is effectively a stub with only payment metadata available.","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":"2026-04-19T07:22:45.112Z","embedding":[-0.024765015,-0.038970947,0.051849365,0.020462036,0.006210327,-0.025497437,-0.010978699,0.03729248,0.078186035,-0.06951904,0.024276733,-0.044799805,-0.034484863,-0.04107666,-0.03555298,0.008903503,-0.0031719208,-0.0019607544,-0.042266846,0.03048706,0.021133423,-0.030731201,-0.023971558,0.03643799,0.005531311,-0.023010254,-0.014595032,-0.008514404,-0.015274048,-0.052001953,0.035614014,-0.025009155,-0.012992859,0.0119018555,-0.027023315,-0.013717651,-0.010986328,0.037139893,0.029342651,-0.0154418945,-0.009155273,-0.060577393,-0.0016098022,-0.0031280518,-0.06036377,-0.0087890625,0.0035572052,-0.024749756,-0.008796692,0.0126571655,-0.028320312,-0.016662598,-0.0128479,-0.0036849976,0.010131836,0.009742737,-0.0027313232,-0.00548172,0.013374329,0.014045715,-0.004436493,-0.06124878,-0.018600464,-0.008331299,-0.001080513,0.062561035,-0.016067505,0.05078125,0.010932922,0.066467285,0.041137695,0.052337646,0.034606934,0.015258789,0.00774765,-0.0063476562,0.009857178,0.064453125,-0.01637268,-0.023651123,-0.009788513,-0.020401001,-0.052215576,0.007881165,-0.022766113,-0.048095703,-0.01638794,0.025619507,-0.018539429,0.032989502,-0.070373535,-0.004219055,-0.019363403,-0.0039634705,0.007041931,-0.0056037903,-0.029312134,0.014831543,-0.015777588,0.011924744,0.0005545616,-0.047912598,0.014198303,0.01586914,0.036254883,0.043884277,0.027954102,0.033172607,0.0026626587,-0.0064964294,-0.030853271,0.024551392,-0.016082764,-0.0206604,0.025390625,0.008270264,-0.012023926,0.013336182,-0.029922485,0.014930725,-0.04458618,0.042907715,0.004573822,-0.0060272217,0.013000488,-0.054504395,-0.017913818,0.01474762,-0.024642944,-0.008018494,0.0061836243,0.012359619,0.028167725,-0.012413025,-0.023452759,0.01008606,-0.018798828,-0.017944336,-0.048797607,-0.033081055,0.037963867,-0.03616333,0.014579773,0.036071777,-0.09686279,-0.01878357,-0.046722412,0.0048294067,-0.039855957,-0.014266968,0.0015134811,0.020553589,-0.02116394,-0.004878998,-0.027801514,-0.021865845,-0.0058517456,0.02772522,-0.018569946,0.046813965,-0.0069618225,0.034576416,0.021209717,0.01008606,0.03152466,0.033081055,-0.013969421,-0.08105469,-0.076660156,-0.024520874,-0.0070343018,-0.02458191,-0.030883789,-0.00080251694,-0.0032863617,-0.075805664,-0.034057617,-0.012001038,-0.007232666,-0.037261963,0.0010719299,-0.041168213,0.018661499,-0.0022964478,-0.05496216,-0.015625,-0.021438599,0.06793213,0.031036377,0.013442993,0.03543091,-0.020690918,0.05911255,0.028747559,-0.014213562,-0.022247314,0.027297974,-0.016647339,0.009552002,-0.008529663,0.012908936,-0.030471802,0.031585693,0.070129395,0.0132751465,-0.01600647,-0.003944397,-0.056793213,-0.04824829,-0.033569336,0.014602661,0.0061836243,0.0005745888,0.019973755,-0.030212402,-0.029190063,-0.0033550262,0.008155823,0.010093689,0.058410645,0.012512207,-0.008323669,0.015808105,0.019760132,-0.047698975,0.040985107,0.043151855,0.017684937,-0.019363403,-0.029418945,0.031982422,0.024490356,-0.030029297,0.026245117,-0.021972656,0.035827637,-0.00932312,0.024017334,0.017669678,-0.019638062,-0.020736694,-0.024780273,-0.0184021,0.031280518,0.0024700165,-0.020446777,-0.037322998,-0.07116699,0.04776001,0.0385437,0.041900635,-0.0017404556,0.007270813,-0.028198242,-0.009613037,-0.080566406,0.064453125,0.0814209,-0.008110046,-0.014434814,0.016799927,-0.016937256,-0.040527344,-0.013061523,-0.0036945343,-0.03616333,-0.019302368,0.015296936,-0.042755127,-0.0036849976,0.018859863,0.020080566,0.049591064,0.0009422302,-0.04244995,-0.025436401,-0.008148193,0.009422302,-0.031799316,-0.005039215,-0.012420654,0.016967773,0.0362854,-0.0073242188,0.016571045,-0.0025939941,0.0025920868,-0.0132369995,0.0019664764,-0.01335144,-0.031433105,0.013427734,-0.0068511963,-0.062805176,0.014877319,-0.007980347,0.068359375,-0.046783447,0.037231445,-0.010467529,-0.0038375854,0.05935669,-0.002128601,-0.050933838,0.0041503906,0.029968262,0.017181396,0.05014038,0.014816284,-0.042663574,-0.01651001,0.07336426,-0.012420654,-0.008110046,0.019927979,0.01600647,0.031066895,0.0066871643,-0.060058594,-0.031143188,0.0035247803,-0.03466797,0.031173706,-0.017608643,0.032958984,-0.016418457,0.0024528503,-0.02720642,-0.0085372925,-0.031707764,0.010360718,-0.013137817,0.0057029724,-0.010475159,-0.012107849,0.021942139,0.014930725,-0.012641907,0.0018730164,0.04360962,0.019500732,-0.0052986145,-0.027359009,-0.034301758,-0.013977051,-0.009841919,0.01637268,0.029052734,0.018325806,0.058166504,-0.04547119,0.01374054,0.03942871,0.013160706,0.040374756,0.0042304993,0.007106781,-0.06628418,-0.052124023,-0.032104492,-0.039520264,0.036193848,0.01763916,-0.011917114,0.06060791,0.013191223,-0.03201294,-0.04046631,0.016281128,-0.043426514,-0.010620117,0.03286743,-0.0070533752,-0.025436401,0.0036678314,-0.011741638,0.0032978058,0.030731201,0.019165039,0.018539429,0.064819336,0.0491333,0.009140015,0.006072998,0.00969696,0.029052734,0.012786865,-0.03111267,-0.016647339,-0.007675171,0.0234375,-0.016677856,-0.0158844,-0.060516357,0.05831909,0.0446167,0.090148926,0.023361206,0.003929138,0.04019165,-0.020492554,0.0031471252,-0.033325195,-0.02279663,-0.020339966,-0.039794922,0.028640747,-0.012054443,-0.00919342,-0.013641357,0.03225708,-0.003704071,0.022598267,-0.025787354,0.05493164,-0.00043082237,-0.015151978,0.01928711,0.014015198,0.043029785,0.05303955,-0.037384033,0.035095215,0.018035889,-0.036132812,0.004497528,0.029937744,-0.013313293,0.0025310516,-0.0418396,-0.025024414,-0.0012607574,-0.008178711,-0.048858643,-0.0024204254,-0.0030498505,0.022399902,0.038635254,-0.021087646,-0.020401001,-0.007888794,-0.006389618,-0.050079346,-0.015640259,-0.03869629,0.00067424774,0.040405273,-0.029159546,-0.007583618,0.010986328,-0.004131317,-0.006916046,0.008125305,0.030212402,-0.004085541,-0.049041748,0.025802612,0.0054855347,0.021408081,0.00868988,0.035308838,0.023757935,0.02999878,0.04699707,0.009292603,-0.017837524,-0.05596924,0.020370483,-0.04248047,0.0018320084,0.021133423,-0.012878418,-0.0023822784,-0.010726929,-0.01902771,-0.04333496,0.013427734,-0.018310547,-0.0017461777,0.021209717,-0.034484863,-0.03427124,-0.05731201,-0.020843506,-0.0058555603,0.06335449,0.027511597,-0.012374878,-0.07043457,-0.01171875,0.029190063,0.007507324,0.021011353,-0.01448822,-0.0043411255,-0.008056641,-0.03289795,-0.011138916,-0.017120361,0.01260376,-0.004524231,-0.0025596619,0.0259552,0.020568848,0.025039673,-0.004333496,0.008987427,0.022872925,-0.028762817,-0.0022029877,-0.011482239,0.033966064,0.007835388,-0.0032405853,-0.042785645,0.043182373,0.014785767,0.035064697,-0.031021118,-0.008277893,0.0059814453,0.019836426,0.024475098,-0.015808105,-0.016662598,-0.013786316,-0.047546387,-0.07672119,0.05041504,-0.0284729,0.036071777,0.020431519,0.0055732727,0.01374054,-0.004600525,-0.0030212402,0.022277832,-0.027954102,-0.019851685,-0.02696228,-0.02784729,-0.013717651,-0.0005517006,-0.013458252,0.016326904,-0.01977539,0.0065078735,0.0057411194,-0.025970459,0.016052246,-0.00029563904,-0.005241394,0.0151901245,0.0010547638,0.029373169,0.044067383,0.008224487,-0.031173706,0.018966675,0.0038890839,0.0049476624,-0.0102005005,0.046173096,0.03152466,-0.00919342,-0.0054359436,-0.0014295578,-0.015144348,-0.028686523,0.007232666,0.0060043335,0.016052246,-0.0032749176,-0.037322998,0.008399963,0.014801025,-0.033477783,-0.028457642,0.014411926,0.0075302124,-0.033233643,0.02658081,0.03286743,0.051330566,-0.017303467,-0.0032997131,0.012237549,0.032989502,0.034454346,0.01687622,-0.014961243,0.01675415,-0.008087158,0.024154663,-0.00070381165,-0.0082473755,0.015312195,0.010154724,0.020080566,0.026748657,0.0043144226,-0.024475098,-0.032440186,0.004020691,-0.00919342,-0.02557373,0.019210815,0.017181396,0.026138306,-0.019805908,0.020751953,0.012207031,-0.015205383,-0.02078247,-0.014694214,0.039093018,-0.018173218,-0.023727417,0.01776123,0.009635925,0.031143188,-0.05581665,0.0060195923,0.0063934326,0.019561768,-0.034606934,-0.043640137,-0.038085938,0.0073165894,0.034210205,0.012908936,0.024719238,0.02722168,-0.007637024,0.0015468597,0.02330017,0.005836487,-0.015274048,-0.013191223,-0.049041748,-0.0075531006,-0.0018386841,0.0037784576,-0.028900146,0.00655365,-0.006904602,-0.026779175,0.007873535,-0.013122559,-0.0075569153,-0.013008118,0.006462097,0.042877197,-0.010292053,0.012931824,-0.028121948,-0.031204224,-0.0042495728,0.014099121,0.0121536255,-0.048797607,0.02128601,-0.009155273,0.00040221214,0.00045514107,0.0047798157,0.021438599,0.025741577,0.0098724365,0.026992798,-0.036865234,0.03933716,-0.03717041,0.018966675,0.005241394,-0.035980225,-0.002412796,-0.029052734,-0.011268616,0.043945312,-0.019485474,-0.004371643,-0.022827148,-0.042907715,-0.008712769,-0.048614502,0.011543274,0.032196045,0.03555298,-0.028015137,0.0035381317,-0.0032844543,0.0018777847,-0.011306763,0.0140686035,-0.016830444,0.018981934,0.016448975,0.004261017,-0.030563354,-0.018356323,-0.025619507,-0.005493164,-0.054779053,-0.04547119,-0.019104004,-0.002368927,-0.00541687,-0.009109497,-0.03652954,-0.02609253,-0.0027656555,-0.042907715,0.016952515,0.0062561035,0.013069153,0.010292053,-0.02772522,-0.0029582977,0.012237549,-0.0054244995,0.037872314,0.023117065,-0.013092041,-0.044769287,0.00548172,0.014839172,0.029785156,-0.002696991,-0.014831543,-0.01058197,-0.024749756,-0.052856445,-0.009864807,-0.01007843,0.0004837513,-0.012481689,0.005947113,-0.04788208,0.0035171509,-0.021530151,0.0022468567,0.02319336,0.008705139,0.010147095,0.0019397736,0.012329102,-0.006011963,-0.014556885,-0.037902832,0.016677856,0.0107803345,0.005874634,0.022918701,0.042236328,0.008979797,-0.021438599,0.016983032,0.0093688965,0.014152527,-0.016647339,0.0014743805,-0.02067566,0.003622055,-0.016403198,-0.0124053955,-0.03842163,-0.0030975342,0.09387207,0.0048713684,-0.011634827,-0.012176514,-0.022735596,0.02331543,0.029571533,-0.038085938,-0.00868988,-0.02633667,0.017150879,-0.027145386,0.010238647,0.008094788,0.031066895,-0.021575928,-0.055908203,-0.014122009,0.0006546974,-0.017425537,-0.061187744,-0.027755737,-0.06112671,-0.0064048767,-0.017288208,-0.013900757,0.005290985,0.012489319,-0.0184021,-0.08502197,-0.0043296814,0.04373169,0.0016870499,0.025115967,-0.009246826,0.016647339,0.020935059,-0.036987305,-0.0047912598,0.033813477,-0.03186035,-0.014045715,-0.022705078,0.022094727,-0.017486572,-0.016403198,0.014839172,0.005783081,0.020248413,0.00038409233,0.0041999817,-0.010696411,0.020004272,-0.015129089,0.024307251,-0.011375427,-0.007972717,0.026275635,-0.03933716,0.020217896,0.015281677,-0.0052452087,0.0034923553,0.030181885,0.046539307,-0.040802002,-0.0028896332,0.017684937,0.012107849,0.043151855,-0.020980835,0.036132812,0.008834839,-0.017501831,0.01789856,-0.011375427,-0.019760132,-0.036071777,-0.028900146,0.030151367,-0.0013713837,0.014541626,-0.0155181885,0.013458252,0.009315491,0.0046958923,0.014762878,-0.0011644363,-0.028503418,-0.023590088,0.0018205643,0.003627777,0.0038547516,-0.0036849976,0.02468872,0.016815186,0.040893555,0.014152527,-0.008506775,-0.002161026,0.029846191,-0.012229919,0.000518322,0.021575928,-0.0035438538,0.014289856,0.022109985,0.014320374,-0.044708252,-0.012145996,-0.022567749,-0.020370483,0.0041389465,-0.00422287,-0.020843506,-0.004261017,-0.003042221,-0.003730774,-0.028320312,0.009468079,-0.029022217,-0.027755737,-0.0009384155,-0.01776123,0.020080566,0.004966736,0.008583069,0.018981934,-0.003768921,0.045013428,0.00655365,-0.018310547,0.037872314,0.031173706,0.010025024,-0.029373169,-0.005760193,-0.011367798,-0.009407043,-0.0010137558,-0.03414917,0.0103302,0.04336548,-0.019943237,0.010879517,-0.0019302368,0.026306152,-0.009277344,0.014877319,-0.011131287,0.016159058,-0.013809204,0.032073975,-0.05218506,0.01020813,0.013557434,-0.0017261505,-0.01637268,-0.0041542053,-0.029922485,0.017837524,0.0070991516,-0.010520935,0.045288086,0.0038700104,0.030853271,-0.029312134,-0.021408081,0.017044067,-0.030410767,-0.025268555,0.029815674,0.0015468597,-0.006904602,0.018661499,-0.020233154,0.030075073,-0.03314209,0.019851685,0.0014877319,-0.005706787,-0.012016296,-0.022338867,-0.015403748,-0.016098022,-0.015281677,-0.001332283,-0.0011796951,0.0435791,0.01713562,0.031921387,0.05984497,0.013259888,0.0050086975,-0.034423828,-0.033447266,0.0027637482,-0.024749756,0.012794495,-0.0078048706,0.060821533,0.04269409,0.0006227493,0.035369873,0.023544312,0.032806396,0.013076782,0.0143585205,-0.017211914,0.013160706,-0.016555786,0.021911621,-0.00083494186,0.050476074,-0.032989502,0.022476196,0.020507812,0.02519226,-0.030517578,0.03010559,0.05731201,0.01373291,-0.013786316,0.044067383,-0.0074539185,-0.009254456,-0.017654419,-0.018173218,0.049316406,0.007572174,0.05090332,0.051727295,0.014450073,-0.00655365,0.024780273,-0.032989502,-0.026321411,0.06640625,0.029388428,-0.018005371,-0.01675415,-0.009918213,0.0066719055,-0.048583984,-0.030563354,0.018875122,-0.010787964,0.012397766,-0.004886627,-0.011192322,-0.011634827,0.011993408,0.02746582,0.023406982,-0.018722534,0.026123047,0.033599854,-0.0007047653,0.027511597,-0.0061416626,0.034118652,-0.027114868,-0.022277832,0.013458252,0.018753052,-0.0140686035,-0.005783081,0.02357483,0.007637024,0.048217773,0.047058105,-0.021713257,0.013923645,0.027435303,0.012397766,0.0008125305,0.050720215,0.043151855,0.017120361,0.038085938,0.031341553,0.030303955,-0.03842163,0.013786316,-0.0012788773,0.0016832352,-0.008979797,-0.011650085,0.010688782,-0.011711121,0.024475098,-0.0040893555,-0.010047913,0.015975952,0.021118164,-0.0017118454,-0.009346008,-0.009567261,0.008544922,-0.026657104,0.0034561157,0.017410278,-0.018630981,0.040222168,0.008293152,0.02558899,-0.027572632,0.023757935,-0.010597229,-0.018295288,-0.0051345825,0.021438599,-0.034973145,0.007881165,-0.008766174,0.0025081635,-0.04888916,0.016403198,0.034973145,-0.017990112,0.02468872,0.0047302246,0.0000046491623,0.0038337708,0.021438599,0.004234314,0.0013427734,-0.0048599243,-0.02923584,0.03579712,0.049987793,0.0034294128,0.012718201,-0.017700195,-0.00472641,0.0061073303,-0.01109314,-0.003446579,-0.008529663,-0.02192688,-0.02696228,0.010276794,0.03668213,0.025726318,0.038879395,-0.011001587,-0.0184021,0.011360168,0.02911377,0.00340271,-0.003993988,-0.017120361,0.032440186,-0.018127441,0.0513916,0.039276123,0.0046653748,0.041229248,-0.009056091,-0.02166748,0.0067214966,-0.0062332153,0.025650024,-0.017593384,0.005771637,-0.0015850067,0.02986145,-0.014892578,-0.033233643,0.008628845,-0.014305115,-0.017456055,-0.023132324,0.010910034,0.0037651062,0.030227661,0.037841797,0.013130188,-0.02798462,0.066833496,-0.010017395,0.041748047,-0.011497498,-0.006629944,0.05581665,0.024932861,0.03765869,0.023391724,0.021331787,-0.035705566,0.0181427,0.03652954,0.022140503,0.0116119385,0.0023860931,-0.012184143,0.04083252,0.0061912537,0.025375366,-0.015014648,0.0024814606,0.008308411,-0.00019836426,-0.0030899048,-0.00041484833,-0.009155273,0.004085541,0.04257202,-0.029632568,-0.009056091,-0.016448975,-0.012359619,0.034118652,-0.008880615,0.004142761,-0.0018777847,-0.03074646,0.0143966675,-0.029632568,-0.020187378,0.0063591003,0.02609253,-0.04006958,-0.0146484375,0.0074920654,0.015060425,-0.022918701,0.02949524,0.02658081,0.008834839,0.008735657,0.047180176,-0.011497498,0.036102295,-0.018478394,0.018859863,0.02973938,0.008560181,-0.014541626,0.005645752,0.013114929,-0.01234436,0.014083862,0.0362854,-0.01158905,0.0010280609,-0.002105713,-0.009498596,0.013626099,0.0058898926,-0.009429932,0.006416321,-0.014945984,-0.018829346,0.0038013458,0.0062446594,-0.0027561188,0.0077285767,-0.012374878,-0.013549805,0.014289856,0.040100098,0.02432251,-0.0423584,-0.0022602081,0.0018043518,0.012924194,-0.01966858,-0.013374329,0.0058135986,-0.03503418,0.017715454,0.01285553,0.00932312,0.0093688965,-0.025985718,0.001288414,0.030075073,0.018157959,0.024398804,0.000021457672,-0.0034694672,0.025543213,-0.0103302,0.00097084045,-0.011230469,-0.0154800415,0.012687683,0.026504517,-0.005886078,-0.028762817,0.031280518,-0.00070524216,0.012023926,0.0035820007,-0.013122559,0.01676941,-0.008071899,-0.010437012,0.00315094,0.019119263,-0.005077362,-0.0065307617,-0.013420105,0.027404785,0.049865723,-0.010894775,-0.007835388,0.020843506,0.021224976,0.01373291,0.036499023,0.011398315,0.040985107,0.025848389,-0.01889038,-0.021774292,0.020492554,-0.011558533,-0.030960083,0.02003479,-0.012870789,-0.016113281,0.016845703,0.008110046,-0.0047340393,-0.030380249,-0.013694763,-0.010017395,-0.024673462,0.018447876,-0.013061523,0.006916046,-0.028503418,-0.008758545,0.0055770874,-0.022567749,-0.04776001,-0.015365601,0.0014333725,-0.006416321,-0.043640137,0.0060768127,-0.026168823,0.010292053,-0.020217896,-0.011016846,-0.019302368,0.01902771,-0.018127441,-0.01889038,0.00248909,0.028137207,0.020202637,-0.0004544258,0.024749756,-0.029373169,-0.030914307,-0.03262329,0.008644104,-0.016525269,0.022842407,-0.0025157928,0.040985107,0.023025513,-0.011878967,-0.00081825256,-0.013969421,-0.010391235,-0.009651184,-0.018127441,-0.024612427,0.021240234,0.016494751,-0.008972168,-0.012321472,0.037872314,-0.022521973,-0.015052795,0.026290894,0.045654297,0.010612488,0.034973145,-0.012199402,-0.007133484,-0.017120361,0.0019140244,-0.019134521,0.0063972473,0.016418457,-0.0048942566,-0.004535675,0.0039863586,0.030410767,-0.00970459,-0.009719849,0.026855469,0.0031051636,-0.0062332153,0.040252686,0.012008667,0.008514404,-0.007507324,-0.013404846,0.020751953,0.03778076,0.015609741,0.005050659,-0.002462387,0.0082473755,-0.015853882,0.0082473755,0.020004272,-0.016052246,-0.044036865,-0.0129470825,-0.037719727,0.014190674,0.0063438416,0.019317627,-0.001625061,0.014892578,-0.02078247,-0.02960205,-0.012962341,0.022720337,0.0206604,-0.0103302,-0.011871338,0.0060768127,0.017730713,-0.027023315,0.0033435822,-0.042510986,-0.044525146,-0.006149292,-0.020477295,0.01878357,0.010803223,-0.0069236755,0.003753662,-0.004135132,-0.0027999878,-0.003047943,0.02619934,-0.017364502,-0.010665894,0.0284729,0.011291504,-0.022750854,0.0119018555,-0.026046753,-0.003004074,0.025131226,-0.008705139,0.013916016,-0.0124053955,0.037597656,-0.0064849854,0.0010528564,0.023117065,-0.007484436,0.009918213,-0.023376465,0.003824234,0.0058250427,-0.0069389343,0.031036377,-0.024871826,-0.021484375,0.005393982,-0.025482178,-0.0284729,0.0026931763,0.014198303,0.038085938,-0.005302429,0.036621094,-0.015640259,-0.018844604,0.020568848,0.0024719238,-0.019454956,-0.0003604889,0.03591919,0.004627228,-0.0067100525,-0.0061912537,-0.0023822784,-0.033843994,-0.012130737,0.0101623535,-0.0037555695,-0.012336731,0.030960083,0.01448822,0.046966553,-0.0076026917,0.020812988,0.007282257,0.007499695,0.026397705,0.002500534,0.040527344,-0.0060691833,-0.03173828,0.0074920654,0.0017442703,-0.026168823,-0.0074806213,-0.010375977,0.0016775131,-0.048950195,0.011726379,-0.009399414,0.030288696,-0.025177002,0.013641357,-0.028015137,-0.0034713745,-0.037261963,-0.017822266,-0.02571106,0.009353638,0.024673462,0.0025691986,0.017532349,0.008659363,-0.0231781,0.01626587,0.046844482,-0.0040779114,-0.032470703,-0.018356323,0.011558533,0.0042381287,0.0029830933,0.002117157,-0.014877319,-0.019866943,-0.0024299622,-0.014465332,0.009529114,-0.009002686,0.013717651,0.005508423,-0.007118225,-0.00010371208,0.02897644,-0.002281189,-0.010787964,0.019378662,0.014907837,0.033966064,0.032806396,-0.018753052,0.023330688,0.024887085,-0.043640137,0.052886963,-0.008094788,0.028121948,-0.01638794,-0.0035533905,-0.032196045,-0.025665283,-0.009788513,0.0043029785],"createdAt":"2026-04-18T18:50:46.484Z","updatedAt":"2026-04-22T07:01:11.611Z","lastSeenAt":"2026-04-22T07:01:11.611Z","tsv":"'/api/v1/payments/383':91 '/payments/383':196 '/request':13,28,171 '0.02':12,27,70,125,170 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':119 '20':113 '2913':120 '300':139 '6':129 'Base network API' 'USDC micropayment endpoint' 'accept':92,105 'access':7,22,38 'actual':191 'address':135 'advertis':144 'ai':58 'analysi':153 'analyt':57 'api':6,21,37,79 'avail':213 'base':9,24,75,115,122 'behind':193 'beyond':176 'broad':146 'call':4,19 'categori':66 'challeng':100 'classif':156 'commit':86 'confirm':101 'connect':187 'cost':69 'data':56 'decim':130 'document':175,208 'embed':157 'endpoint':32,49,90,150,197 'equal':124 'exact':107 'exact-schem':106 'exampl':212 'exchang':160 'extrem':181 'feed':159 'financ':61 'function':192 'geocod':162 'given':126 'howev':174 'includ':151 'infrastructur':64 'json':97 'json-response' 'key':80 'land':178 'learn':60 'limit':83 'live':104 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48 'network':76 'offer':50 'one':46 'openapi':203 'page':179 'particular':195 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,109,131 'per':3,18 'platform':53,143 'point':173 'post':93 'post-method' 'premium':5,20,36 'premium access endpoint' 'price':158,172 'protocol':43 'provid':35 'rate':82,161 'request':68,94 'request/response':206 'requir':87 'return':96 'schema':207 'scheme':108 'second':140 'sent':133 'sentiment':152 'show':186 'sibl':149 'span':55 'spars':182 'spec':204 'specif':89 'subpag':184 'suit':147 'summar':155 'text':154 'timeout':141 'unclear':199 'unit':116 'usag':211 'usdc':15,30,72,118,127 'usdc-base-network' 'util':65 'valid':163 'via':10,25,39 'wallet':188 'web3':62 'x402':11,26,41,99 'x402 API' 'x402-payment'","prices":[{"id":"a39c351a-4b13-4068-9ef4-3c0fc729860f","listingId":"367b723a-1f84-46b4-a5a0-587e0728b7b6","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/payments/383","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:46.484Z"}],"sources":[{"listingId":"367b723a-1f84-46b4-a5a0-587e0728b7b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/383","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:46.484Z","lastSeenAt":"2026-04-22T07:01:11.611Z"}],"details":{"listingId":"367b723a-1f84-46b4-a5a0-587e0728b7b6","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/383 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <your-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/383"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/383"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without API key management","Pay-as-you-go data or utility access on Base L2"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing is inefficient","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.174Z"},"updatedAt":"2026-04-22T07:01:11.611Z"}}