{"id":"afc25b85-e871-4382-9782-2ec0d650eb59","shortId":"T65H9D","kind":"x402","title":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/36`) gated behind the x402 payment protocol. The endpoint returns HTTP 402 with an x402 challenge requiring payment in USDC on the Base network. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe provider lowpaymentfee.com hosts a broader catalog of x402-gated APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment settles on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe specific `/api/v1/emails/36` endpoint's exact functionality is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The endpoint is confirmed live via the 402 challenge, but the lack of documentation about what this email endpoint actually returns is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base","email-data","per-request-billing","no-api-key"],"categories":["data"],"synonyms":["email API","x402 email endpoint","pay-per-request email","USDC gated API","Base network API","lowpaymentfee email"],"warnings":["The exact functionality of /api/v1/emails/36 is undocumented — 'Premium API Access' is the only description available","No OpenAPI schema, request body format, or response schema is provided","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content","The broader site lists many endpoint categories but none specifically for 'emails', making this endpoint's purpose unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/36","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/emails/36 is entirely undocumented. The docs pages returned only 'Connect wallet' with no content.","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":"2026-04-21T19:06:20.596Z","embedding":[-0.015602112,0.0006828308,0.061523438,0.020874023,0.03286743,-0.035217285,-0.024536133,0.029342651,0.061676025,-0.07232666,0.03741455,-0.03704834,-0.051239014,-0.028823853,-0.044311523,0.009307861,0.0040283203,-0.019744873,-0.048675537,0.030517578,0.053833008,-0.017211914,-0.01524353,0.038970947,-0.011405945,0.0048332214,-0.0076904297,0.0015945435,0.011978149,-0.03225708,0.016845703,-0.028457642,-0.005241394,0.004760742,-0.007003784,0.032409668,-0.014335632,0.059539795,0.03314209,0.0034866333,0.009056091,-0.03564453,0.014572144,0.0075645447,-0.03152466,-0.012687683,0.011444092,-0.036010742,0.004535675,-0.0062713623,-0.013511658,0.0029392242,-0.014259338,-0.0028629303,0.018661499,0.026412964,-0.0026950836,-0.01689148,0.003025055,0.015602112,-0.011100769,-0.07739258,-0.036621094,-0.024810791,0.023712158,0.048675537,-0.015296936,0.036865234,0.022094727,0.078063965,0.024887085,0.06506348,0.061920166,0.0032196045,-0.0017213821,-0.034179688,0.002275467,0.012260437,-0.0259552,-0.030517578,-0.018356323,-0.010169983,-0.047668457,-0.0042762756,-0.019515991,-0.06335449,-0.008781433,0.029403687,-0.02671814,0.030960083,-0.103271484,-0.01586914,-0.010803223,0.01399231,-0.0034332275,0.008552551,-0.00844574,-0.0038051605,0.00015997887,0.0046691895,0.010292053,-0.03643799,0.023956299,0.011672974,0.051849365,0.026412964,0.016311646,0.014137268,0.007637024,-0.014976501,-0.015235901,-0.013298035,-0.024993896,-0.0056152344,0.012382507,-0.008239746,-0.01979065,0.018936157,-0.026794434,0.038391113,-0.03994751,0.04647827,0.0049057007,-0.014167786,0.007083893,-0.0345459,-0.034057617,-0.0146102905,-0.013916016,0.0096206665,0.04675293,0.014465332,0.04650879,-0.034851074,-0.024871826,0.03237915,-0.0036525726,-0.018508911,-0.055725098,-0.0072669983,0.044006348,-0.01977539,0.014305115,0.03466797,-0.08093262,-0.00944519,-0.05041504,0.018478394,-0.018447876,0.0135269165,0.0016927719,0.019897461,0.003786087,-0.010597229,-0.032592773,-0.013694763,-0.0015821457,0.047454834,-0.0021343231,0.016159058,-0.006565094,0.02180481,0.042419434,-0.0071792603,0.011566162,0.034362793,-0.0047073364,-0.07208252,-0.059539795,-0.03036499,-0.010017395,-0.0069122314,-0.044891357,0.014503479,-0.005382538,-0.060272217,-0.009399414,0.014930725,-0.0012226105,-0.03286743,-0.010726929,-0.027267456,-0.012886047,0.0010690689,-0.06604004,-0.022033691,-0.008880615,0.06500244,-0.00053310394,0.002008438,0.019958496,-0.011497498,0.042419434,0.034576416,-0.029586792,-0.024124146,0.01727295,-0.022445679,0.02406311,0.03277588,0.021316528,-0.027526855,0.036712646,0.036468506,-0.0051002502,-0.012512207,0.019195557,-0.04598999,-0.02067566,-0.009208679,0.02078247,-0.0020561218,-0.023132324,0.017547607,-0.038482666,-0.030334473,-0.009544373,-0.016235352,0.02796936,0.0647583,0.011352539,0.010292053,0.0138168335,0.015609741,-0.03237915,0.030319214,0.03994751,0.022369385,-0.02999878,-0.017959595,0.023040771,0.036499023,-0.019424438,0.002653122,-0.017944336,0.016159058,-0.014083862,-0.0042381287,0.038848877,-0.0069122314,-0.03845215,-0.03201294,-0.0007381439,0.039978027,0.0006260872,-0.028533936,-0.046936035,-0.052642822,0.046936035,0.06994629,0.0067749023,0.004924774,0.020324707,-0.048919678,-0.022827148,-0.073913574,0.03527832,0.06500244,-0.015609741,-0.030258179,0.051116943,-0.01737976,-0.021606445,-0.0008058548,0.01234436,-0.025512695,-0.013252258,-0.0023612976,-0.046569824,0.017929077,0.0024337769,0.032043457,0.06188965,-0.012428284,-0.044189453,-0.00630188,0.014320374,-0.0063476562,-0.021621704,-0.008041382,-0.0031528473,0.019943237,0.023895264,-0.02658081,0.018966675,0.005569458,0.015586853,0.0034542084,-0.00096940994,-0.04171753,-0.010719299,0.005794525,0.008911133,-0.05734253,0.0019702911,0.009529114,0.0513916,-0.0340271,0.04559326,-0.014930725,-0.009796143,0.048950195,-0.0154953,-0.035736084,-0.02079773,0.017211914,0.048095703,0.064331055,0.015823364,0.030960083,-0.012992859,0.049438477,-0.011421204,0.006690979,-0.004928589,0.037506104,0.021194458,0.02470398,-0.05218506,-0.060638428,-0.007663727,-0.010154724,0.023086548,-0.044067383,0.025772095,0.01727295,0.011367798,-0.010871887,-0.000015377998,-0.04360962,-0.0022354126,-0.02166748,0.002128601,-0.041534424,-0.010398865,0.023117065,0.023880005,-0.0016021729,0.0012922287,0.03048706,0.002960205,0.0024166107,-0.02468872,-0.036346436,-0.03439331,-0.005748749,-0.0022144318,0.027160645,0.010620117,0.023849487,-0.051361084,0.025146484,0.02796936,0.02508545,0.027938843,-0.008041382,0.03363037,-0.07556152,-0.027862549,-0.012832642,-0.014259338,0.035095215,0.039367676,0.016281128,0.05984497,-0.0016431808,-0.036071777,-0.0501709,0.048309326,-0.04095459,0.0030841827,0.04623413,-0.016174316,-0.020446777,0.013053894,0.0028495789,0.021270752,0.038879395,0.00881958,0.04272461,0.06842041,0.053955078,-0.014755249,-0.012786865,0.04421997,0.019882202,-0.020126343,0.00095033646,-0.020935059,-0.026824951,0.028411865,-0.013748169,-0.015571594,-0.07977295,0.060821533,0.03744507,0.074401855,0.026031494,0.030807495,0.014572144,-0.017868042,0.0046081543,-0.0034866333,-0.033294678,-0.016342163,-0.05682373,0.016296387,0.005580902,0.018859863,-0.0340271,0.009674072,0.015419006,0.0018444061,-0.018722534,0.06365967,0.000538826,-0.0016202927,0.029968262,0.005367279,0.0317688,0.027542114,-0.045898438,0.02986145,0.017486572,-0.023086548,-0.017623901,0.0036621094,0.0036773682,-0.022720337,-0.06427002,-0.031463623,-0.029449463,-0.03753662,-0.07232666,-0.0033626556,-0.0032749176,0.034057617,0.036621094,-0.023910522,-0.040802002,0.011413574,-0.0034275055,-0.058380127,-0.0023479462,-0.041168213,0.026565552,0.024658203,-0.026947021,0.0027065277,-0.00087976456,-0.0033912659,0.0012454987,0.011741638,-0.025848389,-0.019363403,-0.03668213,0.0037631989,-0.011734009,0.013748169,0.015014648,0.02859497,0.020828247,0.023254395,0.02166748,-0.0009293556,-0.026901245,-0.04977417,0.023361206,-0.04107666,0.026275635,0.01890564,-0.007331848,-0.003238678,-0.0031642914,-0.014907837,-0.014595032,0.014007568,-0.050445557,-0.004901886,0.034484863,-0.038726807,-0.020370483,-0.062408447,-0.023483276,-0.0131073,0.05316162,0.030029297,-0.016342163,-0.04058838,-0.026412964,0.014541626,-0.0023517609,0.0002270937,-0.014541626,-0.015350342,-0.0075569153,-0.03427124,-0.04385376,0.00012254715,0.033477783,-0.018188477,-0.035125732,0.0048942566,-0.024978638,0.033843994,0.014442444,0.003967285,0.028411865,-0.026473999,0.0019044876,-0.0048828125,0.037963867,0.009552002,-0.017730713,-0.03829956,0.040252686,0.008720398,0.04522705,-0.039489746,-0.008895874,-0.012786865,0.028274536,0.005470276,-0.014152527,-0.0129852295,-0.0013170242,-0.022628784,-0.09790039,0.033966064,-0.010749817,0.025131226,-0.009536743,0.017227173,0.035461426,-0.0035114288,-0.010299683,0.033966064,-0.042114258,-0.018966675,-0.03164673,-0.02494812,0.0017757416,0.011734009,-0.0052871704,0.019241333,-0.0039482117,0.022903442,0.006526947,-0.020233154,0.03640747,0.010871887,-0.004802704,0.03793335,-0.00001859665,-0.0044670105,0.04107666,0.011672974,-0.03768921,0.02243042,0.0013790131,0.02507019,-0.0064315796,0.0473938,0.040863037,-0.016021729,-0.006729126,-0.00090265274,-0.0006737709,-0.032043457,0.00043201447,0.01789856,0.048034668,0.00491333,-0.026916504,0.0069389343,0.03250122,-0.030914307,-0.012458801,0.006324768,0.027496338,-0.039367676,0.01134491,0.009223938,0.03778076,-0.027893066,0.005973816,0.017456055,0.035461426,0.023376465,0.0066986084,-0.003288269,0.014350891,-0.0066719055,-0.012588501,0.007701874,-0.018356323,0.004295349,-0.013542175,0.0056266785,0.028259277,0.018356323,-0.012840271,-0.028518677,-0.008171082,0.011177063,-0.011520386,0.02709961,0.02027893,0.030151367,-0.014167786,0.022567749,0.018356323,-0.04598999,0.0021896362,-0.0053367615,0.035217285,0.0058135986,-0.00016486645,0.026519775,0.015602112,0.029190063,-0.051696777,-0.02330017,0.0006542206,0.025772095,-0.026977539,-0.036499023,-0.047729492,-0.029342651,0.024993896,-0.0017232895,-0.004508972,0.037017822,-0.028076172,0.008338928,0.017288208,0.0057029724,-0.008079529,0.004585266,-0.053100586,-0.015777588,-0.0038318634,0.005191803,-0.021697998,0.010322571,-0.018585205,-0.036010742,-0.006164551,-0.02999878,0.008995056,-0.0071144104,0.0036754608,0.03326416,-0.0004541874,0.013946533,-0.018630981,-0.033569336,0.0035743713,0.01713562,0.028671265,-0.044647217,0.013824463,-0.018188477,-0.00069475174,-0.016433716,0.0003759861,0.031143188,0.0018978119,0.009338379,0.023391724,-0.047973633,0.036590576,-0.0074806213,-0.008522034,-0.016830444,-0.03262329,-0.02281189,-0.023925781,-0.0029354095,0.045806885,-0.021484375,-0.022460938,-0.026977539,-0.053497314,-0.02116394,-0.053649902,0.017822266,0.012390137,0.027633667,-0.025009155,0.012123108,0.01776123,0.009460449,-0.006477356,-0.010566711,-0.008911133,0.023162842,0.030395508,0.008621216,-0.048706055,-0.028717041,-0.0060310364,-0.010421753,-0.026794434,-0.02734375,-0.023971558,-0.0077934265,-0.0012636185,0.0018310547,-0.01058197,-0.020751953,-0.006511688,-0.032440186,0.030334473,-0.0058174133,0.000995636,0.0056266785,-0.04019165,0.0038280487,0.0124435425,-0.016677856,0.013015747,-0.011764526,-0.009475708,-0.03363037,0.009765625,0.026153564,0.008232117,-0.017059326,-0.034179688,0.008148193,-0.016616821,-0.055419922,-0.0062408447,-0.016571045,0.0027256012,-0.0048828125,-0.010116577,-0.050598145,0.0015001297,-0.013160706,0.0022716522,0.015129089,0.020462036,0.008323669,-0.010513306,0.018218994,-0.0090789795,-0.01499939,-0.04763794,0.016540527,0.010734558,-0.018707275,0.030227661,0.04031372,-0.011276245,-0.014411926,0.009132385,-0.004901886,-0.000995636,0.0017852783,0.020477295,-0.015670776,0.017578125,0.019729614,-0.03326416,-0.03604126,-0.010848999,0.07305908,-0.0023422241,-0.00065374374,0.0015420914,-0.014335632,0.010261536,0.040924072,-0.03378296,0.0031375885,-0.017471313,0.01902771,-0.011306763,0.020828247,0.0039978027,0.020050049,-0.019744873,-0.05505371,-0.0051879883,-0.00024843216,0.0010137558,-0.057556152,-0.033721924,-0.03277588,0.0008869171,-0.022964478,-0.0040245056,0.0028266907,0.012710571,-0.01889038,-0.06903076,0.006526947,0.050445557,0.005077362,0.031143188,-0.030319214,0.011360168,0.031677246,-0.005870819,-0.0058059692,0.016784668,-0.039031982,-0.011184692,-0.031829834,0.036468506,0.004764557,-0.02507019,0.019729614,-0.0017185211,0.027496338,-0.018371582,0.020996094,-0.016098022,-0.020584106,-0.012268066,0.001958847,-0.016204834,0.003791809,0.02229309,-0.027755737,0.027130127,-0.02128601,0.0043029785,-0.013397217,0.015975952,0.028747559,-0.033416748,-0.0013923645,0.013153076,-0.008712769,0.044525146,-0.036224365,0.04849243,0.015899658,-0.017974854,0.014892578,-0.020767212,-0.04660034,-0.02709961,-0.017868042,0.021026611,0.027389526,0.016952515,-0.0087890625,0.00089120865,0.004497528,0.01309967,0.008552551,-0.004058838,-0.015609741,-0.028671265,0.008865356,0.0016498566,0.01889038,0.008926392,0.009490967,0.022842407,0.047729492,-0.023971558,-0.023712158,-0.0023841858,0.015655518,0.0025196075,-0.003610611,0.0103302,0.014228821,0.010787964,0.019042969,0.010681152,-0.02760315,-0.02104187,-0.017745972,-0.029083252,0.010734558,0.008590698,0.018371582,0.015571594,0.0013561249,-0.007499695,-0.02305603,0.006439209,-0.037384033,-0.008026123,0.0034046173,0.007972717,0.016433716,0.013786316,0.006046295,0.017807007,-0.001039505,0.023712158,0.010955811,-0.016479492,0.019592285,0.0335083,-0.004711151,-0.026443481,-0.015419006,0.005088806,-0.0073623657,0.0021705627,-0.0061950684,0.02067566,0.041870117,-0.0090408325,0.030471802,0.010299683,0.024414062,-0.009796143,0.0076828003,-0.006729126,0.007610321,-0.0043640137,0.021118164,-0.0524292,0.028930664,0.020645142,0.006286621,-0.01171875,-0.011932373,-0.02861023,0.015777588,0.01626587,-0.012611389,0.043426514,-0.013946533,0.035095215,-0.009468079,-0.010322571,0.018981934,-0.021453857,-0.033355713,0.023468018,-0.0062713623,-0.0022716522,0.01386261,-0.023788452,0.043060303,-0.029785156,0.004196167,0.00063180923,-0.016067505,-0.0206604,-0.02255249,0.014266968,-0.031829834,-0.022247314,-0.0052261353,-0.018157959,0.049072266,0.049316406,0.027755737,0.021072388,0.016418457,-0.0059814453,-0.057495117,-0.045959473,0.023071289,-0.024246216,0.032226562,-0.023468018,0.030441284,0.043670654,0.011199951,0.030593872,0.038879395,0.03717041,-0.0016231537,0.009277344,-0.029342651,0.02684021,-0.029067993,0.016174316,0.0071754456,0.038330078,-0.03463745,0.005455017,-0.0014715195,0.023284912,-0.0096588135,0.012268066,0.07720947,0.021865845,-0.00068998337,0.021697998,-0.004211426,-0.02708435,-0.0028266907,-0.02305603,0.052368164,0.009361267,0.034240723,0.028747559,0.01789856,-0.012580872,0.02053833,-0.02772522,-0.030029297,0.028778076,0.027542114,-0.012519836,0.00045251846,-0.01701355,0.008918762,-0.053741455,-0.027679443,0.025405884,0.015113831,0.023590088,-0.007019043,-0.009788513,-0.0026512146,0.034454346,0.002161026,0.014335632,0.004207611,0.014038086,0.020050049,0.012878418,0.044769287,0.0003604889,0.013725281,-0.027359009,-0.027008057,0.012741089,-0.0027179718,-0.012054443,-0.00919342,0.024780273,0.027267456,0.044189453,0.0317688,-0.015388489,-0.004337311,0.025177002,0.019866943,0.013893127,0.043701172,0.015991211,-0.00065517426,0.02709961,0.03463745,0.02041626,0.003730774,0.012519836,-0.0010614395,-0.011108398,0.0074424744,-0.004676819,-0.00027871132,-0.0042304993,0.0071411133,-0.019897461,-0.010917664,0.030517578,0.02973938,0.0054092407,0.014595032,0.015335083,0.0078048706,0.015052795,0.017730713,0.0049552917,-0.01763916,0.027832031,0.012130737,0.04232788,0.0012102127,0.027709961,-0.0035877228,-0.01411438,-0.019058228,0.01953125,-0.04925537,0.009757996,0.0030612946,-0.011924744,-0.025543213,0.012580872,0.009521484,-0.0132369995,0.03933716,0.017196655,-0.019241333,-0.0022735596,0.031173706,0.033996582,-0.013725281,-0.00042033195,-0.023773193,0.021820068,0.05154419,0.017364502,-0.0038928986,-0.03366089,0.005748749,0.008773804,-0.0034046173,-0.0038223267,0.0015735626,0.004196167,-0.038635254,0.02897644,0.029159546,0.0025119781,0.029220581,-0.0030765533,-0.018920898,0.002811432,0.020889282,0.007472992,-0.010116577,-0.012542725,0.022613525,-0.007926941,0.032409668,0.044952393,0.0073242188,0.0178833,0.0031909943,0.0026798248,0.0069847107,-0.018569946,0.009674072,-0.025924683,0.00041913986,-0.019134521,0.03201294,-0.025299072,-0.011497498,-0.0056037903,-0.023101807,-0.026763916,-0.017425537,0.0154800415,0.0105896,0.021835327,0.0317688,0.031219482,-0.0309906,0.05947876,-0.028305054,0.031066895,-0.010215759,-0.011741638,0.061340332,0.04437256,0.041503906,0.005016327,0.012435913,-0.027633667,0.003036499,0.033447266,0.023620605,0.016067505,0.0007286072,-0.02406311,0.03881836,-0.010383606,0.016845703,-0.023895264,0.0041503906,0.012535095,-0.011672974,-0.03427124,-0.0008239746,-0.00085783005,0.005039215,0.044555664,-0.03149414,-0.022216797,-0.028717041,-0.015296936,0.030258179,-0.020965576,-0.0132369995,-0.0010948181,-0.013954163,0.007041931,0.0037727356,-0.011985779,0.015838623,0.034820557,-0.03186035,-0.004299164,-0.009109497,0.03439331,-0.025772095,0.03048706,0.024002075,0.0015478134,0.006549835,0.045196533,-0.0010128021,0.04248047,-0.014221191,0.030181885,0.042877197,-0.011672974,-0.025360107,0.018966675,0.02154541,-0.020904541,0.019592285,0.034423828,-0.0027770996,0.015548706,0.006866455,-0.004119873,-0.0031852722,0.0154418945,-0.023239136,0.00007432699,-0.0052833557,-0.02067566,0.010871887,0.017150879,0.0015497208,0.00040578842,0.00365448,-0.004005432,0.0015554428,0.037597656,0.009803772,-0.03564453,-0.0015106201,0.011543274,0.007446289,-0.022003174,-0.027313232,0.00017261505,-0.052581787,0.020812988,0.032958984,0.006061554,0.0009870529,-0.02394104,0.005645752,0.030334473,0.01499939,0.014961243,0.0029525757,-0.009796143,0.022247314,-0.012832642,-0.011268616,-0.012939453,-0.009811401,0.0047073364,0.023712158,-0.009223938,-0.027496338,0.0012636185,-0.004585266,0.0062408447,0.0044021606,0.009338379,0.0368042,0.0029144287,0.008277893,0.0005168915,0.010650635,-0.019683838,-0.0309906,-0.033996582,0.011909485,0.05847168,-0.016921997,-0.013038635,0.0031604767,0.040771484,0.020462036,0.03491211,-0.007167816,0.04837036,0.01322937,-0.0059928894,-0.042816162,0.010047913,-0.028640747,-0.028274536,0.01612854,-0.032165527,-0.014167786,0.01499939,0.003856659,-0.010826111,-0.019165039,-0.0017442703,-0.014465332,-0.028152466,0.028305054,-0.019638062,0.00070619583,-0.031829834,-0.0037956238,0.019897461,-0.022827148,-0.028015137,-0.014076233,-0.0020580292,-0.01309967,-0.062286377,0.01878357,-0.03326416,0.000995636,-0.0129470825,0.01373291,-0.0020256042,0.041778564,0.007801056,0.003528595,0.019302368,0.018920898,0.017990112,0.0013151169,0.029663086,-0.041107178,-0.034301758,-0.008125305,-0.00356102,-0.017608643,0.03173828,0.0012540817,0.01864624,-0.006099701,0.0023155212,0.0022239685,0.003616333,-0.017074585,-0.005493164,-0.051696777,-0.04083252,0.005138397,0.02885437,-0.004085541,0.002632141,0.04486084,-0.0035381317,-0.023712158,0.012718201,0.02633667,0.010986328,0.03778076,-0.012077332,-0.01084137,-0.018753052,-0.0041542053,-0.024093628,0.015388489,0.003648758,0.008399963,-0.015426636,0.01979065,0.0041503906,-0.018188477,0.013618469,0.014801025,0.013328552,-0.023544312,0.04095459,0.010627747,-0.006214142,-0.008934021,-0.002960205,0.016204834,0.046691895,0.012039185,0.024261475,-0.0005879402,-0.0030460358,-0.009216309,-0.0016679764,0.0033187866,-0.025848389,-0.023406982,-0.02822876,-0.02720642,-0.0034561157,-0.0038108826,0.013160706,-0.0020561218,0.028640747,-0.0024986267,-0.03439331,-0.020690918,0.021896362,-0.0015592575,-0.0042037964,0.012687683,0.0065574646,-0.006072998,-0.03463745,0.011169434,-0.068603516,-0.030776978,-0.008239746,-0.014221191,0.012863159,-0.0066452026,-0.0184021,0.013916016,-0.005634308,-0.016021729,-0.006893158,0.022857666,-0.017181396,0.0014371872,-0.0020923615,0.018997192,-0.01789856,0.010253906,-0.021957397,-0.0054855347,0.012001038,-0.014633179,0.027496338,-0.000166893,0.020202637,0.002691269,-0.019592285,0.019241333,0.0059928894,0.0063438416,-0.047943115,-0.00071811676,0.0048332214,-0.028259277,0.017715454,-0.0041542053,-0.03286743,-0.0075798035,-0.013374329,-0.035095215,0.0154953,0.036987305,0.02420044,0.00036001205,0.040374756,-0.024337769,-0.0154800415,-0.011489868,0.008804321,-0.032165527,-0.0061531067,0.029708862,-0.00440979,-0.0077590942,-0.008102417,0.0003106594,-0.029968262,-0.024475098,0.00066280365,-0.012779236,-0.009170532,0.029220581,0.025817871,0.03729248,0.0032196045,0.016723633,0.0154800415,-0.0026683807,0.019866943,-0.0031814575,0.041870117,-0.00067949295,-0.03466797,-0.0038318634,0.006515503,0.0067443848,-0.021347046,0.0019159317,-0.016647339,-0.04333496,0.0071983337,-0.0058937073,0.04586792,-0.017105103,0.021835327,-0.01889038,-0.011764526,-0.025726318,-0.0024166107,-0.053100586,0.011260986,0.044311523,0.023727417,-0.0036392212,-0.017547607,-0.033172607,0.027786255,0.020477295,0.010513306,-0.044891357,-0.021881104,-0.0008802414,0.004722595,-0.000115036964,0.025024414,-0.030593872,-0.0146102905,0.013679504,0.007675171,-0.003332138,-0.005718231,0.0109939575,0.003730774,-0.019241333,0.008865356,0.0309906,0.006248474,-0.0044517517,-0.014709473,-0.003129959,0.024490356,0.041931152,-0.008270264,0.017181396,0.030212402,-0.03894043,0.047973633,-0.035705566,0.0066986084,-0.013786316,0.015823364,-0.035461426,0.0003721714,0.0022621155,-0.008369446],"createdAt":"2026-04-21T18:32:10.958Z","updatedAt":"2026-04-25T17:04:12.441Z","lastSeenAt":"2026-04-25T17:04:12.441Z","tsv":"'/api/v1/emails/36':44,157 '0.02':10,24,83,131 '000':74 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':154 '20':73 '402':55,210 '6':79 'Base network API' 'USDC gated API' 'access':36,170 'actual':222 'ai':101 'amount':70 'analysi':105 'analyt':100 'api':35,97,136,169,187 'base':8,22,66,75,149 'behind':46 'beyond':165 'broader':91 'catalog':92 'challeng':59,211 'classif':107 'commit':144 'confirm':206 'connect':196 'content':202 'contract':153 'convers':124 'crawl':184 'data':5,19,99 'decim':80 'detail':178 'doc':186 'document':164,179,216 'email':4,18,40,220 'email API' 'email-data' 'email-rel':39 'embed':108 'endpoint':6,20,30,52,127,158,204,221 'equal':82 'estim':118 'exact':160 'exampl':176 'exchang':113 'feed':112 'financ':109 'found':181 'function':161 'gap':227 'gas':117 'gate':3,17,45,96 'generat':125 'generic':167 'geocod':122 'host':89 'http':54 'infrastructur':120 'key':137 'label':171 'lack':214 'learn':103 'limit':140 'list':129 'live':207 'lowpaymentfee email' 'lowpaymentfee.com':32,88 'machin':102 'maximum':69 'minimum':143 'network':67,150 'no-api-key' 'openapi':173 'page':191 'pay':9,23 'pay-per-request email' 'payment':49,61,145 'per':11,25,84,132 'per-request-billing' 'premium':34,168 'price':111,188 'prompt':198 'protocol':50 'provid':33,87 'quot':116 'rate':114,139 'readm':190 'relat':41 'request':12,26,85,133 'request/response':175 'requir':60,71 'resourc':42 'return':53,193,223 'schema':174 'sentiment':104 'settl':146 'signific':226 'span':98 'specif':43,156 'substant':201 'summar':106 'token':115 'unit':76 'usdc':14,28,63,78,152 'usdc-base' 'use':151 'util':121 'valid':123 'via':208 'wallet':197 'web3':110 'x402':2,16,48,58,95 'x402 email endpoint' 'x402-gated':1,15,94 'x402-payment'","prices":[{"id":"bb11d725-53ec-4717-b3c3-4982e03d94bb","listingId":"afc25b85-e871-4382-9782-2ec0d650eb59","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.958Z"}],"sources":[{"listingId":"afc25b85-e871-4382-9782-2ec0d650eb59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.958Z","lastSeenAt":"2026-04-25T17:04:12.441Z"}],"details":{"listingId":"afc25b85-e871-4382-9782-2ec0d650eb59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/36 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/36"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/36"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email-related data on a pay-per-call basis without API key registration","Agent-driven workflows that need email data and can settle micropayments in USDC on Base","Programmatic access to email resources with no subscription commitment"],"bestFor":["Developers wanting zero-signup, pay-per-use email data access","AI agents that can handle x402 payment flows natively","Users who prefer crypto micropayments over traditional API subscriptions"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.553Z"},"updatedAt":"2026-04-25T17:04:12.441Z"}}