{"id":"b82c514e-0371-4e03-85f0-db54f2da3dc8","shortId":"Y6z4Gb","kind":"x402","title":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/emails/89` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, and utility categories. The specific endpoint is listed under \"Premium API Access\" and accepts POST requests, returning JSON responses. Payment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (i.e., $0.02) per request. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the timeout window is 300 seconds.\n\nHowever, the exact functionality of the `/api/v1/emails/89` endpoint is unclear. The provider's landing page does not list this specific route among its documented API categories (data, AI, finance, infrastructure). The path suggests it may return email-related data for a specific record (ID 89), but there is no schema, documentation, or example response available to confirm what the endpoint actually returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","post-method"],"categories":["data"],"synonyms":["email API","email lookup","premium email endpoint","x402 email","pay-per-call email","lowpaymentfee email","USDC email API"],"warnings":["The exact functionality of /api/v1/emails/89 is undocumented — the endpoint path is not listed on the provider's landing page among its API categories.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","The 'emails/89' path suggests a fixed record ID, which may indicate a demo or placeholder endpoint rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/89","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/emails/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/emails/89 is not explained anywhere in the crawled material. The docs pages are empty beyond a wallet-connect prompt.","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":"2026-04-21T19:19:33.524Z","embedding":[-0.01878357,-0.03164673,0.07293701,0.01991272,0.027435303,-0.036346436,-0.027542114,0.024780273,0.07354736,-0.07550049,0.027008057,-0.041656494,-0.04171753,-0.043762207,-0.042266846,0.00667572,0.011383057,-0.013824463,-0.03250122,0.027053833,0.023361206,-0.037200928,-0.03201294,0.018661499,0.0017623901,-0.006816864,-0.039031982,0.005138397,0.019836426,-0.04638672,0.033599854,-0.042999268,-0.011871338,0.015205383,-0.019866943,0.023849487,0.0024108887,0.033447266,0.03250122,0.0025596619,0.007381439,-0.03781128,-0.00819397,-0.017105103,-0.044281006,-0.018234253,0.002811432,-0.022247314,0.021057129,0.0042915344,-0.00920105,0.011978149,-0.000026881695,0.007270813,0.00011014938,0.027816772,0.008079529,0.017288208,-0.003572464,0.034729004,-0.0045166016,-0.078552246,-0.026931763,-0.03390503,0.009292603,0.064697266,-0.019943237,0.040039062,0.024719238,0.08856201,0.031204224,0.0748291,0.047729492,0.011276245,0.006668091,-0.026779175,-0.0021152496,0.02368164,-0.029830933,-0.036865234,-0.015533447,-0.000688076,-0.04071045,-0.012550354,-0.012687683,-0.03488159,-0.0024051666,0.024261475,-0.019012451,0.029830933,-0.07495117,-0.009628296,-0.0033664703,-0.0037403107,0.016723633,-0.018829346,-0.006816864,0.0041503906,-0.0070762634,0.011444092,0.0012998581,-0.04598999,0.025344849,0.001250267,0.03778076,0.03152466,0.015075684,0.005924225,0.015960693,-0.01461792,-0.032958984,0.011734009,-0.014976501,-0.016967773,0.011146545,0.0039367676,-0.015792847,0.012542725,-0.030563354,0.012229919,-0.01713562,0.051452637,-0.007144928,0.010025024,0.0048675537,-0.039855957,-0.02319336,-0.0045318604,-0.008377075,0.0008239746,0.04171753,0.015075684,0.055480957,-0.0146484375,-0.037078857,0.01626587,-0.0072784424,-0.016342163,-0.055236816,-0.03112793,0.053100586,-0.023025513,0.015380859,0.034606934,-0.080322266,-0.004142761,-0.03466797,-0.0024528503,-0.012390137,-0.009460449,0.0043525696,0.004547119,0.005088806,-0.009086609,-0.0309906,-0.0034809113,0.00605011,0.03390503,-0.018920898,0.02911377,0.0027828217,0.014228821,0.037506104,-0.007820129,0.014862061,0.032287598,0.0057907104,-0.079956055,-0.07159424,-0.017913818,-0.007575989,-0.001455307,-0.05239868,0.037628174,-0.009811401,-0.037384033,0.0149383545,-0.0012016296,0.008872986,-0.03894043,0.015655518,-0.03793335,-0.0023212433,-0.0067253113,-0.07110596,-0.0060424805,-0.0126953125,0.06781006,0.01991272,0.0018959045,0.0435791,-0.025817871,0.04034424,0.033691406,-0.03387451,-0.019302368,0.027923584,-0.024230957,0.0031871796,0.028305054,0.014579773,-0.030944824,0.04168701,0.06604004,-0.0052452087,-0.009559631,0.004825592,-0.04864502,-0.033081055,-0.011428833,0.041625977,0.0012798309,-0.001033783,0.026977539,-0.033721924,-0.041107178,-0.012260437,0.025527954,0.01940918,0.042053223,0.005783081,0.005455017,0.012229919,0.028121948,-0.025497437,0.039642334,0.03225708,0.014060974,-0.02468872,-0.025238037,0.019821167,0.026245117,0.00022959709,0.008132935,-0.020126343,0.020339966,-0.024337769,0.00049066544,0.014976501,0.009689331,-0.023452759,-0.029144287,-0.023269653,0.031280518,0.0061683655,-0.01864624,-0.026062012,-0.057006836,0.05407715,0.044769287,0.026351929,-0.012580872,0.023788452,-0.044067383,-0.033416748,-0.0635376,0.04336548,0.05609131,0.002450943,-0.011917114,0.035308838,-0.01499939,-0.019515991,0.023849487,-0.005168915,-0.043701172,-0.006629944,-0.015533447,-0.0546875,-0.006210327,-0.012542725,0.039215088,0.048461914,0.003129959,-0.030410767,0.00057935715,-0.0074310303,0.0013055801,-0.008758545,-0.0112838745,-0.013046265,0.021102905,0.006942749,-0.025039673,0.014877319,-0.010848999,0.0040016174,-0.00008904934,0.0059432983,-0.015701294,-0.035064697,-0.0058898926,-0.0037441254,-0.049987793,-0.0023441315,0.0020275116,0.05908203,-0.04510498,0.03250122,-0.0026493073,-0.0049324036,0.06756592,-0.0020446777,-0.043762207,-0.014884949,0.014076233,0.022567749,0.07122803,0.027496338,-0.0012245178,-0.010276794,0.06628418,-0.0045433044,-0.013504028,-0.0012569427,0.016677856,0.025482178,0.008560181,-0.04425049,-0.037231445,0.0007338524,0.0000057816505,0.019454956,-0.00819397,0.012565613,0.0038070679,-0.002565384,-0.01134491,-0.027496338,-0.023880005,-0.0058517456,-0.05102539,0.009140015,-0.02545166,0.005279541,0.030670166,-0.0059509277,0.002937317,0.0006966591,0.034057617,-0.0020580292,-0.006401062,-0.021270752,-0.03353882,-0.04800415,-0.012008667,-0.013336182,0.025909424,0.0027656555,0.035308838,-0.056152344,0.018188477,0.039215088,0.01651001,0.023788452,-0.013870239,0.008514404,-0.093444824,-0.043060303,-0.033355713,-0.00010955334,0.016342163,0.02078247,-0.0027656555,0.0670166,-0.009544373,-0.06317139,-0.073791504,0.04434204,-0.03778076,0.010887146,0.052734375,-0.008621216,-0.0074691772,0.016113281,-0.031555176,-0.002866745,0.05218506,0.017669678,0.048583984,0.07324219,0.03829956,-0.037841797,-0.009094238,0.04421997,0.017288208,-0.0012865067,-0.022323608,-0.02027893,-0.03237915,0.040039062,0.007858276,-0.016433716,-0.07348633,0.057006836,0.05697632,0.06842041,0.03189087,0.02293396,0.017364502,-0.0056762695,-0.018920898,-0.0029582977,-0.023849487,-0.002325058,-0.050842285,0.008476257,-0.025024414,0.034942627,-0.027313232,0.01424408,-0.005859375,0.019638062,-0.017913818,0.062347412,-0.013519287,0.012649536,0.03137207,0.0061073303,0.022003174,0.04574585,-0.038330078,0.029907227,0.024841309,-0.043914795,0.00038146973,0.042999268,-0.027389526,-0.018997192,-0.052886963,-0.023452759,-0.0035037994,-0.015655518,-0.046661377,-0.008628845,-0.0011539459,0.005924225,0.036468506,-0.027664185,-0.032226562,-0.010353088,-0.0039596558,-0.058685303,0.020309448,-0.035125732,0.027511597,0.025344849,-0.019104004,-0.005809784,0.004878998,-0.015380859,-0.003932953,0.0004892349,0.014541626,-0.009292603,-0.027694702,0.008018494,0.0038051605,0.014205933,0.0032901764,0.025619507,0.0011444092,0.06298828,0.028884888,-0.0033664703,-0.024475098,-0.03982544,0.021575928,-0.040985107,0.023742676,0.035827637,-0.018341064,0.021514893,0.0007596016,-0.04373169,-0.025131226,0.015670776,-0.04711914,-0.022262573,0.027770996,-0.026245117,-0.03186035,-0.048095703,-0.022415161,-0.0065307617,0.03616333,0.018981934,-0.008552551,-0.07043457,0.0061569214,0.013793945,0.0063705444,0.009376526,-0.013694763,-0.030441284,-0.022277832,-0.024215698,-0.031021118,0.0040245056,0.026672363,-0.007865906,-0.016799927,0.013328552,-0.005405426,0.042663574,0.026672363,0.014091492,0.050720215,-0.047058105,-0.0033283234,0.018753052,0.062683105,0.0019321442,-0.034088135,-0.037719727,0.024139404,0.0038051605,0.04525757,-0.03314209,-0.015296936,-0.01689148,0.011199951,0.005908966,-0.004421234,-0.009796143,-0.018997192,-0.051971436,-0.09716797,0.027542114,-0.005744934,0.04055786,0.0011024475,0.005050659,0.021911621,-0.0057296753,-0.014915466,0.03213501,-0.027038574,-0.028778076,-0.025527954,-0.02494812,-0.019042969,-0.005962372,-0.012550354,0.037841797,0.006587982,0.0368042,0.020187378,-0.016326904,0.014381409,-0.013023376,0.008674622,0.03338623,-0.006778717,0.0044288635,0.035003662,0.0135650635,-0.038024902,0.020767212,0.0032291412,0.042297363,-0.0033092499,0.04107666,0.060272217,0.010307312,0.014350891,-0.00015878677,-0.014976501,-0.026046753,0.0079193115,-0.0007548332,0.0206604,-0.010696411,-0.030914307,0.02696228,0.026062012,-0.042633057,-0.024719238,0.014533997,0.024307251,-0.05050659,0.012084961,0.009147644,0.03652954,-0.015563965,0.010917664,0.013290405,0.043884277,0.031707764,0.0088272095,-0.008728027,0.011795044,-0.0024414062,-0.0020332336,0.0052871704,-0.008300781,0.010108948,-0.0026855469,0.02166748,0.015319824,-0.008155823,-0.0019168854,-0.025802612,-0.027267456,0.014541626,-0.018157959,0.018203735,0.027389526,0.028930664,-0.033599854,0.029373169,0.0051956177,-0.023086548,0.0018320084,0.010406494,0.034179688,-0.012321472,-0.020629883,0.009063721,0.019104004,0.026367188,-0.05545044,-0.022994995,0.011795044,0.015899658,-0.03161621,-0.025604248,-0.036102295,-0.023468018,0.020935059,0.010597229,0.014038086,0.029571533,-0.022964478,0.020431519,0.014823914,0.025726318,-0.020736694,0.00491333,-0.03778076,-0.018096924,0.0056877136,0.018051147,-0.0259552,0.0032310486,-0.0033893585,-0.030227661,0.0066490173,-0.02571106,0.0064811707,-0.006137848,0.00003129244,0.04156494,-0.0057907104,0.016479492,-0.034484863,-0.036376953,-0.0043945312,0.024597168,0.019012451,-0.053863525,0.010902405,-0.012794495,-0.011627197,0.015335083,0.0060043335,0.02494812,0.014350891,0.012954712,0.03363037,-0.07373047,0.044677734,-0.01386261,0.00945282,0.010032654,-0.016799927,-0.0011749268,-0.015586853,-0.005355835,0.04272461,-0.021575928,-0.032989502,-0.018844604,-0.06567383,-0.011116028,-0.057159424,0.014213562,0.009361267,0.031219482,-0.015068054,0.008720398,0.0011520386,0.0064811707,-0.014808655,-0.0027065277,-0.011001587,0.011177063,0.039367676,0.012611389,-0.044189453,-0.03112793,-0.028198242,0.0015029907,-0.0256958,-0.036834717,-0.010650635,-0.008811951,-0.004020691,-0.009391785,-0.007572174,-0.009132385,-0.0077819824,-0.05706787,0.029846191,-0.021270752,0.0070495605,-0.008682251,-0.034820557,0.00093221664,-0.0074424744,-0.01084137,0.026443481,0.004219055,-0.003929138,-0.014961243,0.017105103,0.01184845,0.009796143,0.005672455,-0.011238098,0.0016613007,-0.019073486,-0.0473938,0.0026474,-0.010375977,-0.0039367676,-0.01461792,-0.0020389557,-0.04525757,0.018753052,-0.0063438416,0.004173279,0.014953613,-0.000834465,0.014633179,0.0013151169,0.016906738,-0.00605011,-0.025421143,-0.048675537,0.017044067,0.009902954,0.0049819946,0.035369873,0.034057617,0.014709473,-0.006351471,0.03152466,-0.004917145,0.000022113323,-0.016540527,0.0287323,-0.010673523,0.0068855286,0.0013132095,-0.02180481,-0.026138306,-0.005756378,0.07965088,-0.000016391277,-0.028533936,-0.011650085,-0.027740479,0.00970459,0.02796936,-0.023773193,0.01109314,-0.0033092499,0.0018405914,-0.016830444,0.015975952,-0.008079529,0.028427124,-0.024765015,-0.038848877,0.009376526,-0.01033783,0.0012750626,-0.058929443,-0.033111572,-0.03387451,0.0057373047,-0.022521973,-0.009902954,0.011138916,0.0003771782,-0.004688263,-0.083984375,0.004573822,0.032318115,0.0031433105,0.029220581,-0.031433105,-0.000056684017,0.016647339,-0.02532959,0.006866455,0.01928711,-0.031219482,-0.003124237,-0.045288086,0.034362793,0.00019824505,-0.013290405,0.0132369995,-0.017181396,0.021377563,-0.012420654,0.009422302,-0.026046753,-0.011650085,-0.030715942,0.018585205,-0.023040771,-0.012649536,0.038604736,-0.02619934,0.027389526,-0.00041651726,0.0004708767,0.009918213,0.021102905,0.033447266,-0.03677368,-0.008132935,0.0003979206,-0.0034294128,0.047851562,-0.03314209,0.040374756,0.00957489,-0.028274536,0.021713257,-0.0060691833,-0.023208618,-0.037109375,0.0060424805,0.019165039,-0.0077285767,0.021820068,-0.01637268,0.010612488,-0.00843811,0.00907135,0.012145996,0.016281128,-0.022918701,-0.0362854,-0.0039749146,0.019958496,0.005542755,0.01007843,0.028305054,0.015342712,0.041931152,-0.006542206,-0.025146484,-0.0036144257,0.029144287,-0.0011138916,-0.0047302246,0.024673462,0.00415802,0.0012321472,0.014404297,0.00674057,-0.030136108,-0.018981934,-0.017578125,-0.025512695,-0.010681152,-0.0045776367,0.017440796,0.007865906,-0.0016002655,0.012840271,-0.027160645,-0.0025920868,-0.02746582,-0.016342163,0.0066452026,-0.0002799034,0.028045654,-0.0003888607,0.007774353,0.017578125,0.0016803741,0.013008118,0.02104187,-0.019729614,0.027130127,0.0151901245,0.0015106201,-0.01424408,-0.01360321,-0.021881104,0.0035381317,-0.013336182,-0.02468872,-0.0035438538,0.044555664,-0.018066406,0.02142334,0.009384155,0.022598267,-0.014038086,0.012901306,0.00012910366,0.024780273,0.010299683,0.01802063,-0.0463562,0.033325195,0.028564453,-0.0043525696,-0.014480591,-0.015991211,-0.035247803,0.028686523,0.011619568,-0.0005645752,0.035705566,-0.009094238,0.027267456,-0.008079529,-0.003730774,0.016036987,-0.029769897,-0.010635376,0.03491211,-0.010917664,0.00919342,0.0158844,-0.03164673,0.042816162,-0.02279663,0.007671356,-0.0151901245,-0.025650024,-0.012702942,-0.03250122,0.0034656525,-0.024505615,-0.023025513,0.0034427643,0.002527237,0.054229736,0.037719727,0.023895264,0.0395813,-0.016693115,-0.01625061,-0.051361084,-0.04498291,0.016326904,-0.018447876,0.018722534,-0.02468872,0.052490234,0.042816162,0.0077438354,0.035858154,0.024917603,0.03137207,0.0071258545,0.011497498,-0.019592285,0.00749588,-0.027191162,0.013870239,0.010108948,0.044799805,-0.022598267,0.010185242,0.01763916,0.032470703,-0.013771057,0.021087646,0.06890869,0.009727478,0.013504028,0.025497437,0.006324768,-0.03048706,0.002418518,-0.023422241,0.04421997,0.0030994415,0.05041504,0.046203613,0.013031006,-0.013519287,0.009590149,-0.034240723,-0.014862061,0.046051025,0.032287598,-0.014022827,-0.009338379,-0.010818481,0.0011997223,-0.053955078,-0.03817749,0.028701782,0.0016736984,0.015304565,-0.01914978,-0.012138367,-0.01197052,0.035125732,0.013450623,0.020843506,-0.011558533,0.027923584,0.03527832,0.0011138916,0.035064697,-0.026672363,0.006412506,-0.022857666,-0.035827637,0.0073547363,-0.017333984,-0.0068740845,-0.022964478,0.024108887,0.020507812,0.049713135,0.040924072,-0.014015198,0.020523071,0.03237915,0.0012550354,0.007575989,0.04837036,0.02519226,0.00422287,0.037994385,0.018661499,0.026367188,0.00077342987,0.021270752,-0.0031909943,-0.003528595,0.006706238,-0.0084991455,0.016983032,-0.021133423,0.0119018555,-0.020553589,-0.0045700073,0.0149002075,0.038482666,0.0055160522,-0.0013389587,0.010055542,0.0019817352,-0.006374359,0.01386261,0.0107803345,-0.010925293,0.05239868,0.017105103,0.028381348,-0.009979248,0.028579712,-0.014228821,-0.014022827,-0.006980896,0.016845703,-0.042541504,0.023254395,-0.0075912476,-0.012329102,-0.03036499,0.019577026,0.009681702,0.0010261536,0.0345459,0.006866455,-0.004711151,0.014732361,0.02720642,0.02067566,-0.009231567,0.015457153,-0.026168823,0.029373169,0.04135132,0.014724731,-0.00032424927,-0.035614014,0.0064811707,-0.0019893646,0.008018494,-0.027664185,-0.010520935,-0.01335144,-0.0317688,0.02142334,0.019180298,-0.0055389404,0.04284668,0.0020427704,-0.008110046,0.0010375977,0.022354126,-0.010696411,-0.011634827,-0.007911682,0.00705719,-0.01272583,0.051361084,0.041229248,0.0027542114,0.029296875,-0.0045051575,-0.017944336,-0.0107040405,-0.02142334,0.022109985,-0.02734375,-0.0049057007,-0.005180359,0.038879395,-0.030288696,-0.015220642,0.0031528473,-0.013633728,-0.025466919,-0.016998291,0.020309448,0.014518738,0.041534424,0.028564453,0.016067505,-0.03677368,0.055847168,-0.020111084,0.041137695,-0.011695862,-0.015731812,0.050048828,0.021194458,0.029754639,0.005470276,0.014053345,-0.03753662,0.0005478859,0.0340271,0.010017395,0.026855469,-0.014457703,-0.03086853,0.039001465,-0.014419556,0.012992859,-0.036895752,0.0030288696,0.012794495,-0.0033187866,-0.019180298,0.0019083023,-0.01272583,-0.0027656555,0.019195557,-0.03366089,-0.024353027,-0.009208679,0.0007648468,0.022766113,-0.016677856,-0.0016899109,0.0076408386,-0.024169922,0.008651733,-0.008705139,-0.025009155,0.006462097,0.03286743,-0.036865234,-0.0013885498,0.0028076172,0.022720337,-0.024475098,0.028198242,0.0385437,0.0074005127,0.0022010803,0.040222168,-0.005924225,0.034698486,-0.034729004,0.020141602,0.0335083,0.0023670197,-0.0135650635,0.008659363,0.015548706,-0.024154663,0.02218628,0.035186768,-0.013221741,0.0023422241,0.008354187,-0.011650085,-0.002008438,0.00043034554,-0.013847351,0.009422302,-0.016937256,-0.028839111,0.009407043,0.016235352,-0.013923645,0.0030956268,-0.0028038025,0.002336502,0.020217896,0.033599854,0.027618408,-0.03189087,-0.02128601,0.0018644333,0.009086609,-0.026824951,-0.027313232,0.010314941,-0.035064697,0.006149292,0.027618408,0.008644104,0.015701294,-0.023254395,0.0013208389,0.025909424,0.0075912476,0.025360107,0.0029506683,0.000105917454,0.029037476,-0.004169464,0.0023880005,-0.013389587,-0.021102905,-0.0026111603,0.030258179,-0.013412476,-0.029846191,0.013717651,-0.004257202,0.017807007,0.00029420853,-0.0015411377,0.048614502,-0.004020691,0.009521484,-0.008224487,0.01197052,-0.021118164,-0.02885437,-0.017852783,0.009498596,0.04574585,-0.018615723,-0.020095825,0.024673462,0.036468506,0.022949219,0.03149414,-0.009384155,0.046844482,0.0109939575,-0.018096924,-0.029296875,0.0101623535,-0.018173218,-0.027877808,0.019821167,-0.029312134,-0.022994995,0.01398468,0.0107803345,-0.013374329,-0.02609253,0.0050201416,-0.010978699,-0.029144287,0.024887085,0.0029830933,-0.0005350113,-0.026657104,0.0028247833,0.002243042,-0.03237915,-0.046569824,0.000052571297,-0.0051231384,-0.012840271,-0.059295654,0.0079422,-0.038391113,0.008964539,-0.011665344,-0.00554657,-0.021835327,0.0231781,0.0008764267,-0.007259369,0.0076904297,0.010108948,0.03375244,0.0090408325,0.03161621,-0.041778564,-0.039031982,-0.021835327,-0.004611969,-0.012008667,0.022644043,0.015525818,0.013061523,0.008239746,-0.0023422241,0.01411438,-0.009002686,-0.017730713,-0.0022964478,-0.035949707,-0.033569336,0.01953125,0.021881104,-0.012611389,-0.0062179565,0.03778076,-0.013870239,-0.01725769,0.0362854,0.04208374,-0.000108897686,0.031341553,-0.0082473755,-0.0072402954,-0.0064888,0.00299263,-0.019073486,0.016281128,0.0027751923,0.016464233,-0.013832092,0.020523071,-0.000041604042,0.0037975311,0.016418457,0.020446777,0.01626587,-0.007686615,0.024734497,0.0074424744,0.004005432,-0.0042037964,0.0027751923,0.019378662,0.037750244,0.021377563,0.017150879,0.0003669262,0.006778717,-0.0025501251,-0.020370483,-0.003917694,-0.019989014,-0.042633057,-0.010749817,-0.020858765,-0.010871887,-0.0032653809,0.011833191,-0.0061836243,0.035003662,-0.00919342,-0.0362854,-0.012420654,0.028503418,0.032409668,0.005153656,-0.0017166138,0.00856781,-0.0023994446,-0.032470703,0.021392822,-0.04724121,-0.038208008,0.014862061,-0.01914978,0.0012559891,0.005493164,-0.0030574799,0.0065689087,-0.010025024,-0.020187378,-0.010169983,0.021438599,-0.008178711,0.0011072159,0.013938904,0.027160645,-0.015319824,0.015151978,-0.015106201,-0.0046081543,0.017044067,-0.0074386597,0.029464722,0.0047340393,0.027877808,-0.012687683,-0.021820068,0.0054397583,-0.006134033,0.0044174194,-0.049987793,0.0013446808,0.0029201508,-0.015113831,0.004760742,-0.020706177,-0.028915405,-0.015625,-0.011039734,-0.018951416,0.002632141,0.017745972,0.027282715,0.008453369,0.04260254,-0.031066895,-0.009666443,0.00018644333,-0.0023593903,-0.025741577,-0.0068473816,0.020736694,-0.000032424927,-0.016799927,-0.01864624,-0.010093689,-0.022888184,-0.016357422,0.019363403,-0.010643005,-0.009262085,0.02470398,0.02432251,0.04156494,0.015029907,0.01234436,0.010147095,-0.0026779175,0.006427765,0.0025959015,0.039093018,-0.001996994,-0.039154053,0.0019245148,0.0027313232,-0.017181396,-0.01852417,-0.011520386,-0.01625061,-0.035064697,0.007827759,-0.015899658,0.02368164,-0.00472641,0.022079468,-0.03265381,-0.0030574799,-0.03604126,-0.018447876,-0.034698486,-0.00919342,0.04244995,-0.0008330345,0.0019798279,-0.012573242,-0.017700195,0.008705139,0.005012512,0.0009880066,-0.030761719,-0.024658203,-0.0025482178,0.008026123,0.028656006,0.012573242,-0.017562866,-0.010635376,0.0070266724,0.0010261536,-0.00020956993,-0.0037193298,-0.002494812,-0.0044059753,-0.006164551,0.0079422,0.033447266,-0.006072998,-0.0039520264,-0.0005302429,0.003686905,0.027008057,0.031433105,-0.009674072,0.025360107,0.013183594,-0.044403076,0.054260254,-0.026672363,0.020065308,-0.015602112,0.004131317,-0.045654297,-0.010864258,-0.0063209534,-0.006500244],"createdAt":"2026-04-21T18:32:12.924Z","updatedAt":"2026-04-25T13:03:36.161Z","lastSeenAt":"2026-04-25T13:03:36.161Z","tsv":"'/api/v1/emails/89':38,157 '/request':17,34 '0.02':16,33,113 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':93 '20':106 '300':149 '89':196 'USDC email API' 'accept':73 'access':71,127 'actual':212 'address':141 'advertis':118 'ai':178 'ai/ml':58 'among':172 'analyt':57 'api':54,70,120,175,218 'attach':130 'avail':206 'base':9,26,88,108 'base-network' 'call':4,21,137 'categori':62,176 'challeng':96 'collect':48 'confirm':97,208 'connect':224 'content':230 'contract':92 'data':6,23,56,177,190 'doc':215 'document':174,202 'email':5,22,188 'email API' 'email lookup' 'email-data' 'email-rel':187 'endpoint':7,24,36,65,99,158,211 'exact':153 'exampl':204 'financ':59,179 'function':154 'handl':81 'header':134 'howev':151 'i.e':112 'id':195 'infrastructur':180 'instant':126 'json':77 'json-response' 'key':121 'land':164 'limit':124 'list':67,168 'live':101 'lowpaymentfee email' 'lowpaymentfee.com':43 'maximum':104 'may':185 'network':89 'offer':46 'page':165,219 'part':40 'path':182 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':50 'payment':79,133,139 'per':3,20,52,114 'platform':44,117 'post':74 'post-method' 'premium':69 'premium email endpoint' 'price':216 'prompt':226 'protocol':85 'provid':162 'rate':123 'recipi':140 'record':194 'relat':189 'render':221 'request':53,75,115 'requir':102 'respons':78,205 'return':76,186,213 'rout':171 'schema':201 'second':150 'settl':12,29 'simpli':129 'span':55 'specif':64,170,193 'suggest':183 'timeout':146 'unclear':160 'unit':109 'usdc':14,31,91,111 'usdc-settlement' 'use':90 'util':61 'via':10,27,82 'wallet':225 'window':147 'x402':11,28,84,95,132 'x402 email' 'x402-payment'","prices":[{"id":"5824aac2-787c-4c2b-b1c4-b81af2020b42","listingId":"b82c514e-0371-4e03-85f0-db54f2da3dc8","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/emails/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.924Z"}],"sources":[{"listingId":"b82c514e-0371-4e03-85f0-db54f2da3dc8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.924Z","lastSeenAt":"2026-04-25T13:03:36.161Z"}],"details":{"listingId":"b82c514e-0371-4e03-85f0-db54f2da3dc8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/89 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 402 challenge requiring 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/89"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/89"},{"claim":"Documentation pages render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data for a specific record via a single paid API call","Agent-driven workflows that need on-demand email data without API key management","Programmatic access to email information settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use email data access","AI agents that can attach x402 payment headers automatically","Users who prefer crypto-native micropayment APIs on Base"],"notFor":["Bulk email sending or transactional email delivery","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.004Z"},"updatedAt":"2026-04-25T13:03:36.161Z"}}