{"id":"e9721209-9ec1-42dc-85e0-bb8559c9c124","shortId":"KGjPg4","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/47` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. The specific resource at `/emails/47` is labeled \"Premium API Access\" and accepts POST requests, returning JSON. Payment is handled via the x402 protocol on the Base network using USDC (contract `0x8335…2913`), with a maximum amount of 20,000 base units — which, at 6 decimals for USDC, equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a uniform $0.02/request pricing model across all endpoints, with no API keys, no rate limits, no minimums, and instant access. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so there is no schema documentation, example payloads, or detailed description of what the `/emails/47` endpoint actually returns. The endpoint name suggests it retrieves or processes email-related data for a specific resource (ID 47), but the exact functionality is unclear from available materials.\n\nThe x402 challenge was successfully captured (HTTP 402 with valid payment parameters), confirming the endpoint is live and operational. The payment timeout is 300 seconds, and the x402 version is 1 with the \"exact\" payment scheme.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","no-api-key"],"categories":["data","email"],"synonyms":["email API","pay-per-call API","x402 email endpoint","USDC micropayment API","lowpaymentfee email","Base network API","premium email access"],"warnings":["No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no content","The exact functionality of /api/v1/emails/47 is unknown; 'Premium API Access' is a generic label applied to all endpoints","No request or response schema is documented anywhere","No examples of input or output are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/47","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/47","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 captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and all doc pages are empty. The purpose of '/emails/47' is entirely unclear.","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":"2026-04-21T19:09:20.564Z","embedding":[-0.026184082,-0.018676758,0.055877686,0.008842468,0.022644043,-0.029953003,-0.026000977,0.023590088,0.08270264,-0.08654785,0.047943115,-0.03262329,-0.029907227,-0.04257202,-0.061340332,0.017669678,0.014343262,-0.0064315796,-0.029876709,0.0052719116,0.0317688,-0.041992188,-0.028915405,0.02293396,-0.0016412735,-0.006134033,-0.036956787,-0.014419556,0.0014820099,-0.04324341,0.045440674,-0.02911377,-0.016967773,0.018417358,-0.017501831,0.020965576,-0.015357971,0.034423828,0.025360107,-0.007865906,0.006340027,-0.028884888,0.0040130615,-0.011222839,-0.04449463,0.0095825195,0.0013313293,-0.023452759,0.010215759,0.0044288635,-0.008659363,-0.0010156631,-0.004169464,0.0034828186,0.015823364,0.028320312,0.012237549,0.0035495758,0.0040512085,0.025375366,-0.007068634,-0.06573486,-0.02645874,-0.025802612,0.009056091,0.05532837,-0.028381348,0.030212402,0.024627686,0.07702637,0.027938843,0.064697266,0.03955078,-0.0005674362,0.025222778,-0.011520386,0.008026123,0.014457703,-0.022064209,-0.032928467,-0.017608643,-0.00843811,-0.039794922,-0.0045661926,-0.014228821,-0.053497314,-0.0020980835,0.03439331,-0.0038433075,0.025634766,-0.10058594,0.0054244995,0.009529114,-0.004585266,0.01676941,-0.006011963,-0.021835327,-0.007106781,-0.007659912,0.015182495,0.028381348,-0.040374756,0.018463135,-0.0060424805,0.017852783,0.03918457,0.026916504,0.030685425,0.013282776,-0.010513306,-0.03286743,0.0026836395,-0.03289795,-0.013450623,0.013015747,-0.004020691,-0.015670776,0.01108551,-0.03286743,0.015029907,-0.02293396,0.04434204,0.00059890747,0.0062026978,-0.0042419434,-0.04333496,-0.022384644,-0.007785797,-0.011161804,0.0064201355,0.050964355,0.015945435,0.05215454,-0.017822266,-0.039489746,0.017944336,0.0039978027,-0.028305054,-0.05038452,-0.042541504,0.05935669,-0.023284912,0.023651123,0.0423584,-0.074401855,-0.0048332214,-0.04159546,-0.0020103455,-0.0035953522,0.009727478,-0.006160736,0.011817932,-0.003944397,0.007583618,-0.031585693,-0.021713257,0.010955811,0.028686523,-0.020492554,0.03010559,-0.00017225742,0.010910034,0.028152466,-0.013130188,0.01802063,0.033477783,0.012901306,-0.06365967,-0.07763672,-0.023254395,-0.0055160522,-0.011947632,-0.05419922,0.021224976,-0.012634277,-0.058135986,-0.01184082,-0.0026893616,0.008399963,-0.033996582,-0.008605957,-0.03286743,-0.002002716,0.00957489,-0.06359863,-0.019958496,-0.0137786865,0.06866455,0.021575928,0.011749268,0.039001465,-0.018493652,0.034851074,0.036346436,-0.02331543,-0.028244019,0.030838013,-0.012176514,-0.00036621094,0.045288086,0.000083208084,-0.022720337,0.045410156,0.064697266,0.0018596649,-0.0017213821,-0.004043579,-0.03866577,-0.022888184,-0.015037537,0.028320312,0.015296936,0.007881165,0.029220581,-0.046173096,-0.038757324,-0.0043144226,0.001405716,0.017578125,0.045166016,0.020950317,0.0013847351,0.024963379,0.023864746,-0.044952393,0.029006958,0.050689697,0.013626099,-0.021865845,-0.024276733,0.033813477,0.022216797,0.0010671616,0.014083862,-0.014633179,0.025848389,-0.021316528,0.012901306,0.018875122,0.0014381409,-0.035125732,-0.03543091,-0.022781372,0.028305054,-0.0013256073,-0.013664246,-0.028961182,-0.05923462,0.042419434,0.040283203,0.025009155,-0.016967773,0.018493652,-0.04510498,-0.017852783,-0.05899048,0.04498291,0.06112671,-0.011894226,-0.014419556,0.028549194,-0.03567505,-0.035003662,0.024734497,0.00374794,-0.03591919,-0.013755798,-0.012687683,-0.053955078,-0.00006788969,-0.0024681091,0.035095215,0.05822754,0.004627228,-0.034088135,-0.0069618225,-0.002532959,0.0010986328,-0.019042969,-0.006603241,-0.005290985,0.011741638,0.01373291,-0.03302002,0.011886597,0.0041503906,-0.009727478,0.0127334595,0.009223938,-0.03878784,-0.03237915,-0.013832092,0.0024852753,-0.048339844,-0.00642395,-0.0073280334,0.052825928,-0.04473877,0.04525757,-0.018722534,0.01171875,0.05557251,-0.0032978058,-0.056610107,0.0021686554,0.030670166,0.038360596,0.06542969,0.014175415,0.007247925,-0.014274597,0.05670166,-0.0030498505,-0.01889038,0.012687683,0.028701782,0.022064209,0.015853882,-0.06359863,-0.033233643,-0.004764557,-0.0032463074,0.010513306,-0.01374054,0.027557373,0.008636475,0.00472641,-0.01713562,-0.015106201,-0.03640747,0.005542755,-0.045440674,0.010551453,-0.024398804,0.011619568,0.023651123,-0.006504059,-0.00074100494,0.0047302246,0.045532227,0.004459381,-0.007762909,-0.023651123,-0.033325195,-0.03717041,-0.013168335,0.0039711,0.033935547,0.013259888,0.022918701,-0.043395996,0.026763916,0.041229248,0.032287598,0.03729248,0.014099121,0.03253174,-0.08898926,-0.046142578,-0.034240723,-0.011291504,0.04324341,0.030761719,0.007411957,0.056549072,-0.001452446,-0.04333496,-0.05215454,0.042419434,-0.042266846,-0.009963989,0.053588867,-0.01890564,-0.0007929802,-0.010444641,-0.0076904297,-0.005580902,0.05154419,0.008979797,0.042175293,0.07458496,0.059661865,-0.011405945,-0.017623901,0.015457153,0.023651123,0.00096559525,-0.016815186,-0.014823914,-0.02784729,0.02885437,-0.008460999,-0.014328003,-0.07421875,0.0625,0.060150146,0.07739258,0.024810791,0.012245178,0.012748718,-0.017608643,-0.0016918182,-0.01020813,-0.017700195,-0.017227173,-0.061431885,0.02432251,-0.009605408,0.011940002,-0.036712646,-0.0011482239,-0.0065956116,0.016860962,-0.017562866,0.06402588,-0.010810852,-0.0058174133,0.038635254,0.0146102905,0.011222839,0.04031372,-0.040649414,0.030181885,0.019744873,-0.04296875,0.008712769,0.03591919,-0.024627686,-0.010322571,-0.05319214,-0.035186768,-0.023651123,-0.024642944,-0.04675293,-0.0087509155,-0.017288208,0.0158844,0.052764893,-0.03479004,-0.04901123,-0.0064468384,-0.0054740906,-0.03439331,0.0057907104,-0.033081055,0.010810852,0.03741455,-0.026153564,-0.00592041,0.003921509,-0.011398315,-0.006515503,0.007774353,0.004333496,-0.021331787,-0.02432251,0.0067749023,-0.0008301735,0.01499939,-0.0047035217,0.0074005127,0.015304565,0.04711914,0.022567749,-0.0069999695,-0.020584106,-0.050964355,0.031280518,-0.04284668,0.029830933,0.044647217,-0.006389618,-0.004558563,-0.012619019,-0.01777649,-0.03894043,0.0051193237,-0.04586792,-0.0046806335,0.026611328,-0.02532959,-0.033935547,-0.057525635,-0.012062073,-0.0149002075,0.0423584,0.01826477,0.01007843,-0.05731201,0.007659912,0.006980896,-0.0037631989,0.014877319,-0.01374054,-0.018249512,-0.008140564,-0.024963379,-0.013893127,0.0062408447,0.018615723,-0.012672424,-0.044189453,0.027297974,-0.011177063,0.064941406,0.02180481,0.01889038,0.03451538,-0.028686523,0.0012636185,0.014274597,0.079711914,0.012634277,-0.026916504,-0.053833008,0.03704834,0.019821167,0.035705566,-0.029449463,-0.012519836,-0.0099487305,0.02166748,0.00088119507,0.0027561188,-0.0022144318,-0.027542114,-0.059509277,-0.085632324,0.020111084,-0.0050811768,0.04611206,0.012374878,0.016952515,0.01411438,-0.0063667297,-0.006214142,0.015411377,-0.032714844,-0.02709961,-0.040985107,-0.022018433,-0.015960693,-0.0118637085,-0.015342712,0.019012451,0.0037059784,0.03765869,0.016174316,-0.028915405,0.01826477,-0.018005371,0.015945435,0.026000977,-0.0056762695,-0.0026741028,0.035064697,0.013374329,-0.049743652,0.022094727,0.013053894,0.025680542,-0.003162384,0.04663086,0.05419922,-0.0037574768,0.004146576,0.008232117,-0.0010890961,-0.024612427,0.01133728,0.0036525726,0.028244019,-0.016326904,-0.032165527,0.017471313,0.022628784,-0.046020508,-0.018966675,0.0005631447,0.025253296,-0.038604736,0.007965088,0.022415161,0.037597656,-0.028701782,0.012420654,0.016052246,0.024246216,0.03225708,0.020645142,0.013168335,0.015106201,0.019226074,0.0035305023,0.0073280334,-0.01411438,0.016983032,-0.00207901,0.022140503,0.027175903,-0.017501831,-0.011070251,-0.021957397,-0.010391235,0.011199951,-0.010398865,0.021621704,0.044403076,0.027252197,-0.025909424,0.012702942,-0.004306793,-0.019958496,0.0033302307,0.0018320084,0.025527954,0.010948181,-0.02041626,0.016433716,0.02029419,0.026763916,-0.05303955,-0.017425537,-0.00299263,0.025604248,-0.03781128,-0.026763916,-0.037628174,-0.020599365,0.014839172,0.013336182,0.0058898926,0.0357666,-0.012435913,-0.0011720657,0.030563354,0.028656006,-0.005847931,0.00002783537,-0.040618896,-0.016021729,0.0015764236,0.006629944,-0.033569336,0.014633179,-0.007671356,-0.03845215,0.0098724365,-0.029922485,-0.0031204224,-0.017303467,-0.004146576,0.03668213,0.00944519,0.007461548,-0.016021729,-0.03656006,-0.0035057068,0.0131073,0.0115356445,-0.05441284,0.002456665,-0.004272461,-0.0049095154,0.01222229,0.0035057068,0.024673462,0.017990112,0.0047912598,0.03933716,-0.07055664,0.044311523,-0.006252289,0.009490967,-0.004432678,-0.025009155,-0.018188477,-0.013069153,0.0074882507,0.05230713,-0.028167725,-0.035217285,-0.024841309,-0.04864502,-0.015335083,-0.05569458,0.017227173,0.020629883,0.019515991,-0.013771057,0.008338928,-0.002544403,0.00819397,-0.03302002,0.0044898987,-0.012809753,0.03262329,0.025283813,0.0065727234,-0.04135132,-0.031341553,-0.017669678,-0.012184143,-0.025024414,-0.045440674,-0.0090789795,-0.0137786865,-0.005104065,-0.005996704,-0.0004746914,-0.010398865,-0.015258789,-0.045440674,0.022094727,-0.011039734,0.013145447,-0.008087158,-0.033355713,-0.005908966,0.0019359589,-0.0005917549,0.018066406,0.0040512085,-0.011039734,-0.015342712,0.014251709,0.0137786865,0.016326904,-0.0010414124,-0.023788452,0.00025105476,-0.0018224716,-0.05630493,-0.004146576,-0.015670776,-0.013847351,-0.00944519,0.007461548,-0.04486084,0.018157959,-0.01763916,0.006450653,0.029190063,0.007247925,0.011947632,-0.0055236816,0.01953125,-0.00699234,-0.019256592,-0.04071045,0.037719727,0.00995636,-0.014266968,0.04498291,0.02659607,0.0079193115,-0.009124756,0.031066895,0.003452301,-0.008384705,-0.015991211,0.018707275,-0.012008667,0.020950317,0.003288269,-0.015419006,-0.040130615,-0.012557983,0.08337402,0.0067253113,-0.010856628,-0.0021400452,-0.018295288,0.013435364,0.026000977,-0.019989014,0.0053710938,-0.011108398,0.0033054352,-0.019454956,0.022094727,-0.0044517517,0.017974854,-0.015586853,-0.04434204,-0.014923096,-0.009880066,-0.005935669,-0.06137085,-0.031921387,-0.041656494,0.019424438,-0.014694214,-0.009094238,0.016784668,0.012382507,-0.01197052,-0.070129395,0.01612854,0.044708252,-0.014404297,0.032165527,-0.02293396,0.005455017,0.02128601,-0.027862549,0.008544922,0.03744507,-0.03982544,-0.0036640167,-0.020980835,0.023590088,-0.0036201477,-0.022323608,0.010437012,-0.013092041,0.024368286,-0.017211914,0.008293152,-0.012702942,0.010887146,-0.019210815,0.0107803345,-0.015625,-0.0021038055,0.0284729,-0.03604126,0.032165527,0.0007095337,-0.0076789856,-0.0051460266,0.021392822,0.0501709,-0.031173706,-0.007080078,0.0063095093,0.007183075,0.042022705,-0.026763916,0.025848389,0.017959595,-0.008338928,0.018493652,-0.0068130493,-0.031555176,-0.027557373,-0.0070610046,0.020492554,0.005279541,0.007965088,-0.012207031,0.009208679,0.006729126,-0.0038166046,0.0060577393,0.010749817,-0.015304565,-0.032684326,0.0067825317,0.011161804,0.007286072,0.011894226,0.03186035,0.017120361,0.033447266,0.0041770935,-0.024917603,-0.009208679,0.02684021,0.0051231384,-0.015380859,0.028930664,-0.0053253174,0.00072050095,0.00970459,-0.004627228,-0.019256592,-0.013572693,-0.023117065,-0.0287323,-0.010635376,0.001789093,0.007736206,0.0065727234,-0.0020332336,-0.008369446,-0.024780273,0.0035686493,-0.027557373,-0.02720642,-0.008399963,-0.00566864,0.038238525,0.0056533813,0.015281677,0.01171875,-0.0003118515,0.031097412,0.022094727,-0.015182495,0.020767212,0.026000977,0.00064754486,-0.015823364,-0.00680542,-0.0033912659,0.007820129,-0.011039734,-0.024246216,0.0138549805,0.04248047,-0.01902771,0.01687622,0.023788452,0.018417358,-0.011695862,0.0055236816,-0.015357971,0.038269043,0.003753662,0.025177002,-0.05001831,0.029830933,0.01876831,0.0034446716,-0.005203247,-0.012519836,-0.030212402,0.02998352,0.0061912537,0.01210022,0.030761719,-0.0010442734,0.016021729,-0.013641357,-0.018493652,0.019622803,-0.02305603,-0.012718201,0.022750854,0.007183075,0.010719299,0.01576233,-0.025543213,0.049591064,-0.021759033,0.021072388,-0.011878967,-0.021026611,-0.0009908676,-0.032714844,-0.0062217712,-0.018447876,-0.0256958,0.003929138,-0.0005803108,0.055267334,0.021438599,0.046173096,0.036499023,0.0158844,-0.011184692,-0.050872803,-0.046020508,0.02482605,-0.011123657,0.039978027,-0.016555786,0.041992188,0.04107666,-0.00749588,0.019622803,0.024353027,0.024887085,0.0027198792,0.0012645721,-0.025314331,0.010444641,-0.020431519,0.003709793,0.0014333725,0.04168701,-0.017227173,0.009017944,0.023239136,0.022537231,-0.01574707,0.029571533,0.07385254,0.017959595,0.00017237663,0.023391724,-0.00737381,-0.027023315,0.008071899,-0.021911621,0.04748535,-0.00068569183,0.033172607,0.037200928,0.011650085,-0.0034828186,0.017501831,-0.03564453,-0.017578125,0.027328491,0.021408081,-0.003730774,-0.012214661,-0.012817383,0.013420105,-0.0513916,-0.03967285,0.020126343,0.003955841,0.015731812,-0.024169922,-0.005744934,0.003921509,0.035186768,0.019439697,0.014961243,-0.012649536,0.017959595,0.032226562,0.00699234,0.047729492,-0.012260437,0.017425537,-0.025314331,-0.0385437,0.011001587,-0.013381958,-0.00025749207,-0.015487671,0.03048706,0.014060974,0.05102539,0.04437256,-0.013694763,0.014419556,0.036956787,0.02217102,0.014846802,0.05343628,0.010665894,0.0011425018,0.045410156,0.015014648,0.017211914,-0.00894928,0.02557373,0.003709793,-0.004589081,0.020492554,-0.0067443848,0.011161804,-0.021408081,0.022445679,-0.009361267,-0.012130737,0.022506714,0.02607727,-0.00056028366,-0.0006017685,0.0099487305,0.004650116,0.0021400452,0.006454468,0.026290894,-0.009864807,0.052124023,0.016143799,0.03845215,0.0027770996,0.033233643,-0.017120361,-0.0071372986,-0.01638794,0.022888184,-0.04135132,0.0206604,-0.008026123,-0.008422852,-0.040893555,0.011405945,0.007499695,-0.019104004,0.04348755,0.016571045,-0.0131073,0.012893677,0.023788452,0.018722534,-0.0011196136,0.0078125,-0.03668213,0.031799316,0.051940918,0.026489258,0.002111435,-0.050476074,0.0055122375,0.007297516,0.01335907,-0.016555786,-0.0020942688,-0.009048462,-0.036315918,0.01965332,0.01675415,0.003211975,0.047729492,-0.0069236755,-0.007572174,0.029876709,0.02746582,-0.002790451,-0.018249512,-0.0029830933,0.011352539,-0.016357422,0.04473877,0.038909912,0.012756348,0.036895752,0.003353119,-0.0062217712,-0.006904602,-0.009208679,0.030563354,-0.02520752,0.014137268,0.002840042,0.031463623,-0.027893066,-0.00894928,-0.0025424957,-0.010009766,-0.026977539,-0.017913818,0.0065727234,0.02029419,0.04510498,0.028396606,0.010635376,-0.026306152,0.05343628,-0.02508545,0.028533936,-0.0050849915,-0.014724731,0.054870605,0.03137207,0.037384033,0.0020923615,0.013511658,-0.038879395,0.012741089,0.036468506,0.019577026,0.022872925,-0.0058555603,-0.034423828,0.040222168,0.0066337585,0.01979065,-0.023757935,0.0011053085,0.016098022,-0.008712769,-0.010856628,0.0015468597,-0.012306213,0.0051193237,0.03213501,-0.022460938,-0.020355225,-0.014953613,-0.0013227463,0.015472412,-0.010215759,-0.014808655,0.00072813034,-0.006210327,0.005554199,-0.018585205,-0.021636963,0.023361206,0.03665161,-0.02192688,-0.0035152435,0.0018119812,0.017807007,-0.019958496,0.023498535,0.020462036,0.008728027,0.017105103,0.0357666,-0.014343262,0.025390625,-0.014045715,0.030181885,0.038757324,-0.0109939575,-0.024475098,0.007286072,0.011543274,-0.031173706,0.023849487,0.032562256,-0.012489319,-0.006652832,0.0033721924,0.0029773712,-0.0011472702,0.008453369,-0.021102905,-0.0015392303,-0.013694763,-0.02279663,-0.0013475418,0.018127441,-0.011436462,0.007911682,-0.012924194,0.0061454773,0.01235199,0.030899048,0.024551392,-0.032836914,-0.013191223,-0.012886047,-0.004863739,-0.0256958,-0.01914978,0.02053833,-0.040405273,0.01360321,0.019180298,0.0016269684,0.018844604,-0.022628784,-0.000038444996,0.026260376,0.0065727234,0.02078247,-0.005001068,-0.0041618347,0.016815186,-0.0036621094,-0.005683899,-0.018096924,-0.015487671,0.0016155243,0.017089844,-0.034454346,-0.03353882,0.018493652,-0.009048462,0.009994507,-0.001455307,-0.008850098,0.039367676,0.00409317,0.0036334991,-0.008483887,0.01109314,-0.0037212372,-0.020095825,-0.0072898865,0.013282776,0.05480957,-0.024627686,-0.012275696,0.011817932,0.023376465,0.029006958,0.027999878,-0.008232117,0.04458618,0.028121948,-0.010612488,-0.042907715,0.011009216,-0.022628784,-0.020431519,0.019638062,-0.027359009,-0.019989014,0.0021305084,0.0026283264,-0.0058784485,-0.023727417,0.00027132034,-0.0121154785,-0.030517578,0.024658203,-0.009269714,-0.013015747,-0.030944824,0.0015678406,-0.00013196468,-0.013496399,-0.035095215,-0.0059165955,0.009284973,-0.017456055,-0.059661865,0.021972656,-0.03463745,0.001958847,-0.017303467,-0.00091362,-0.001824379,0.04006958,-0.0064086914,0.009307861,0.0046920776,0.0181427,0.04562378,0.012138367,0.026763916,-0.03060913,-0.04824829,-0.02999878,-0.0030841827,-0.007827759,0.032287598,0.0146865845,0.025344849,0.022628784,-0.003129959,0.0009889603,-0.009307861,-0.010124207,-0.009552002,-0.027404785,-0.028839111,0.01675415,0.025970459,-0.010894775,0.004737854,0.034210205,-0.006954193,-0.028701782,0.013641357,0.033355713,-0.00374794,0.024597168,-0.009407043,-0.013473511,-0.004142761,0.0033912659,-0.020126343,0.013694763,0.007461548,0.025360107,-0.02204895,0.017028809,0.02078247,-0.012573242,0.01864624,0.019592285,-0.0011110306,-0.018951416,0.029006958,0.008895874,-0.0017385483,-0.0035381317,-0.017333984,0.015655518,0.04525757,0.014328003,0.021652222,-0.008460999,-0.0026683807,-0.007762909,-0.00497818,0.0037956238,-0.015686035,-0.026306152,-0.013587952,-0.022903442,-0.0069351196,-0.002866745,0.00061655045,-0.0024204254,0.02456665,-0.006439209,-0.041809082,-0.017044067,0.024230957,0.028167725,0.00033450127,0.0031032562,0.0011825562,0.00090408325,-0.033294678,0.01612854,-0.052612305,-0.040496826,0.016052246,-0.015106201,0.013870239,-0.0023384094,-0.0049362183,-0.0033435822,-0.006072998,-0.008514404,-0.00018072128,0.01977539,-0.005138397,0.00090646744,0.014076233,0.022094727,-0.025268555,0.02319336,-0.019378662,-0.0043525696,0.01436615,-0.015068054,0.025009155,-0.0008740425,0.026306152,-0.008361816,-0.01474762,0.00056505203,-0.016052246,-0.0048942566,-0.054260254,0.0103302,0.014007568,-0.0038833618,0.0076408386,-0.01020813,-0.02432251,-0.0048942566,-0.02722168,-0.022750854,0.0010757446,0.03378296,0.03744507,0.014404297,0.04385376,-0.020019531,-0.010093689,-0.00081920624,0.0028877258,-0.027618408,-0.0040359497,0.021026611,-0.006023407,-0.0070877075,-0.015472412,-0.0057144165,-0.034698486,-0.018798828,0.009590149,-0.009651184,0.0045280457,0.04046631,0.02470398,0.0368042,0.003917694,0.026184082,0.012756348,-0.005718231,0.010269165,-0.0046691895,0.040802002,-0.008712769,-0.036834717,0.0031051636,-0.0045433044,-0.020523071,-0.0026988983,-0.012611389,-0.016204834,-0.041992188,0.008911133,-0.005882263,0.042541504,-0.009109497,0.03262329,-0.032409668,0.00025820732,-0.039489746,-0.011772156,-0.0345459,-0.0027713776,0.041290283,-0.0019741058,0.01108551,-0.008270264,-0.014122009,0.018341064,0.021194458,0.01374054,-0.0345459,-0.02357483,0.0044403076,0.009208679,0.0128479,0.008621216,-0.014785767,-0.009399414,0.0076026917,-0.00050735474,0.012619019,-0.0032367706,0.004032135,-0.0010309219,-0.0022010803,0.00058603287,0.028274536,-0.016281128,-0.015342712,-0.005088806,0.0041999817,0.03286743,0.028656006,-0.008621216,0.022872925,0.020492554,-0.046081543,0.042785645,-0.025772095,0.016616821,-0.015487671,0.009384155,-0.044403076,-0.024932861,0.0053634644,-0.008552551],"createdAt":"2026-04-21T18:32:12.208Z","updatedAt":"2026-04-22T09:02:01.997Z","lastSeenAt":"2026-04-22T09:02:01.997Z","tsv":"'/api/v1/emails/47':38 '/emails/47':67,171 '/request':17,34,122 '0.02':16,33,111,121 '000':101 '0x8335':93 '1':232 '20':100 '2913':94 '300':225 '402':209 '47':192 '6':106 'Base network API' 'USDC micropayment API' 'accept':74 'access':72,139 'across':125 'actual':173 'advertis':118 'ai/ml':58 'amount':98 'analyt':57 'api':54,71,130 'avail':200 'base':9,26,88,102 'base-network' 'beyond':142 'broader':115 'call':4,21 'captur':207 'challeng':204 'collect':48 'confirm':214 'connect':155 'contract':92 'data':6,23,56,186 'decim':107 'descript':167 'detail':166 'document':141,162 'email':5,22,184 'email API' 'email-data' 'email-rel':183 'empti':148 'endpoint':7,24,36,127,172,176,216 'equal':110 'essenti':147 'exact':195,235 'exampl':163 'financ':59 'function':196 'handl':81 'howev':140 'http':208 'id':191 'infrastructur':60 'instant':138 'json':78 'json-response' 'key':131 'label':69 'land':144 'limit':134 'live':218 'lowpaymentfee email' 'lowpaymentfee.com':43,116 'materi':201 'maximum':97 'minimum':136 'model':124 'name':177 'network':89 'no-api-key' 'offer':46 'oper':220 'page':145,152 'paramet':213 'part':40 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':50 'payload':164 'payment':79,212,222,236 'per':3,20,52,112 'platform':44,117 'post':75 'premium':70 'premium email access' 'price':123 'process':182 'protocol':85 'rate':133 'relat':185 'request':53,76,113 'resourc':65,190 'retriev':180 'return':77,174 'schema':161 'scheme':237 'second':226 'settl':12,29 'show':154 'span':55 'specif':64,189 'sub':151 'sub-pag':150 'success':206 'suggest':178 'timeout':223 'unclear':198 'uniform':120 'unit':103 'usdc':14,31,91,109 'usdc-settlement' 'use':90 'valid':211 'version':230 'via':10,27,82 'wallet':156 'x402':11,28,84,203,229 'x402 email endpoint' 'x402-payment'","prices":[{"id":"c9842bd9-38db-4d92-b336-10788405b463","listingId":"e9721209-9ec1-42dc-85e0-bb8559c9c124","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.208Z"}],"sources":[{"listingId":"e9721209-9ec1-42dc-85e0-bb8559c9c124","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.208Z","lastSeenAt":"2026-04-22T09:02:01.997Z"}],"details":{"listingId":"e9721209-9ec1-42dc-85e0-bb8559c9c124","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/47 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals) on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/47"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/47"},{"claim":"Payment timeout is 300 seconds, x402 version 1, exact scheme","source_url":"https://lowpaymentfee.com/api/v1/emails/47"}],"useCases":["Retrieving email-related data on a per-request payment basis without needing an API key","Integrating pay-per-call email data into agent workflows using x402 protocol","Accessing premium email information with USDC micropayments on Base"],"bestFor":["Agents or developers who want keyless, pay-per-use email data access","x402-compatible clients on the Base network","Low-volume or sporadic usage where subscription pricing is wasteful"],"notFor":["High-volume email processing where per-request costs add up quickly","Users who need detailed API documentation or schema guarantees before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.004Z"},"updatedAt":"2026-04-22T09:02:01.997Z"}}