{"id":"21426c93-e421-46fb-a544-4c8f3d3e5bf3","shortId":"t5stLE","kind":"x402","title":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","description":"This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/68` is part of a broader platform that offers dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micropayments on the Base network.\n\nThe endpoint accepts HTTP POST requests and returns JSON. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The x402 challenge was successfully captured, confirming the endpoint is live.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the `/docs`, `/pricing`, `/api`, and `/README` routes all render only a \"Connect wallet\" stub with no further technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/emails/68` resource actually returns or what input it expects. The endpoint's purpose (email lookup, email sending, email validation, etc.) cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","http-post"],"categories":["email","api"],"synonyms":["email API","x402 email","micropayment email","Base USDC API","pay-per-call email","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' stub.","The purpose of /api/v1/emails/68 is unknown; it could be email lookup, sending, validation, or something else entirely.","No OpenAPI spec or request/response schema is provided.","No example requests or responses are available to verify functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/68","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/emails/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the /emails/68 resource actually does. This is effectively a stub listing.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-21T19:24:42.890Z","embedding":[-0.027404785,0.002046585,0.043945312,0.02041626,0.022033691,-0.053466797,-0.02470398,0.023635864,0.07385254,-0.079833984,0.024780273,-0.04269409,-0.047180176,-0.033721924,-0.0637207,0.001162529,-0.018432617,-0.016845703,-0.026535034,0.027633667,0.04751587,-0.025054932,-0.016784668,0.045684814,-0.008834839,-0.0126571655,-0.017578125,0.0011968613,-0.0022792816,-0.040649414,0.021377563,-0.032165527,-0.023925781,0.01411438,-0.010437012,0.024154663,-0.006465912,0.057525635,0.023239136,0.011680603,0.0015659332,-0.04095459,-0.0012340546,0.0077552795,-0.04525757,-0.013008118,0.011520386,-0.01889038,0.0034637451,-0.009742737,-0.017791748,-0.0069084167,-0.012512207,0.0053977966,0.0051994324,0.028152466,-0.001159668,-0.02609253,0.00020623207,0.0390625,-0.0061187744,-0.07342529,-0.0234375,-0.022766113,0.012107849,0.043823242,-0.014320374,0.04031372,0.025756836,0.08538818,0.033172607,0.051879883,0.043029785,0.007183075,0.00086688995,-0.02658081,0.0031776428,0.025939941,-0.025817871,-0.026916504,-0.02230835,-0.023666382,-0.04373169,-0.016220093,-0.030715942,-0.06524658,-0.0087509155,0.026275635,-0.03152466,0.03491211,-0.099731445,-0.010795593,-0.0028953552,0.012809753,-0.0042152405,-0.0077209473,-0.020126343,0.0044822693,0.011238098,0.00969696,0.0146102905,-0.046539307,0.012680054,0.0063323975,0.057617188,0.018051147,0.01789856,0.020721436,0.0143966675,-0.012390137,-0.03414917,-0.013648987,-0.023651123,-0.0078048706,0.020202637,-0.0058174133,-0.012626648,0.011550903,-0.03149414,0.020889282,-0.047058105,0.056488037,0.0074920654,-0.004714966,0.008995056,-0.047332764,-0.021606445,-0.0073776245,-0.03427124,0.008361816,0.045715332,0.009178162,0.041900635,-0.01675415,-0.026382446,0.021240234,-0.008392334,-0.00945282,-0.06121826,-0.0012397766,0.05291748,-0.039031982,0.014816284,0.021621704,-0.08026123,-0.018310547,-0.044067383,0.012535095,-0.019515991,0.010169983,0.032409668,0.002067566,-0.001868248,-0.014717102,-0.02758789,-0.015525818,-0.01197052,0.048217773,-0.004962921,0.026382446,0.010398865,0.024902344,0.02960205,-0.0035705566,0.008796692,0.0413208,-0.0010652542,-0.074523926,-0.059539795,-0.027893066,-0.0012950897,-0.014923096,-0.031982422,0.032226562,-0.018859863,-0.05331421,-0.0061569214,-0.0031719208,-0.0028591156,-0.043121338,-0.006412506,-0.025375366,-0.013008118,-0.001917839,-0.07196045,-0.034179688,-0.0030994415,0.05731201,0.008323669,0.0064697266,0.02508545,-0.008369446,0.043548584,0.03149414,-0.023468018,-0.03414917,0.027786255,-0.01789856,0.026504517,0.024108887,0.012382507,-0.022247314,0.03201294,0.056030273,0.0013198853,-0.026306152,0.016189575,-0.03982544,-0.040863037,-0.01525116,0.021499634,-0.016708374,-0.004299164,-0.0023040771,-0.032562256,-0.03387451,-0.005428314,0.0019273758,0.01876831,0.059326172,0.005470276,0.011940002,0.008323669,0.015060425,-0.023757935,0.042144775,0.049194336,0.019607544,-0.022659302,-0.020126343,0.021606445,0.027923584,-0.016967773,0.0053367615,-0.00818634,0.0040626526,-0.009590149,-0.0031929016,0.021987915,-0.0027256012,-0.029586792,-0.027023315,-0.00907135,0.013587952,-0.000024914742,-0.025054932,-0.049346924,-0.059173584,0.047027588,0.05783081,0.020477295,0.008811951,0.011779785,-0.031463623,-0.025527954,-0.06982422,0.04901123,0.06774902,-0.015457153,-0.014755249,0.04220581,-0.022277832,-0.022506714,-0.003900528,0.0005970001,-0.022247314,-0.01184082,-0.007331848,-0.05279541,0.009208679,0.009887695,0.04788208,0.049835205,-0.00090026855,-0.05102539,-0.0154418945,0.0055160522,-0.00712204,-0.02758789,-0.014930725,0.0073890686,0.022537231,0.026535034,-0.028717041,0.01689148,-0.0000295043,0.021087646,-0.016418457,0.008422852,-0.031021118,-0.022842407,0.02255249,0.019592285,-0.04159546,0.0051956177,0.0052261353,0.0519104,-0.0418396,0.035949707,-0.026565552,0.002603531,0.047698975,-0.004798889,-0.048736572,-0.014213562,0.019226074,0.036224365,0.06188965,0.015045166,0.013641357,-0.018035889,0.061523438,-0.012992859,-0.010238647,0.0067749023,0.038604736,0.01890564,0.034454346,-0.056488037,-0.062683105,-0.0052261353,0.00065755844,0.026641846,-0.041503906,0.021636963,0.00459671,0.011230469,-0.0287323,-0.0005054474,-0.037261963,0.008079529,-0.031463623,-0.004535675,-0.031799316,-0.007583618,0.015930176,0.0004413128,0.00484848,-0.013717651,0.039794922,-0.00623703,0.002632141,-0.020065308,-0.03390503,-0.042755127,-0.02154541,-0.012825012,0.02784729,0.013381958,0.027862549,-0.054901123,0.029022217,0.029586792,0.013687134,0.03060913,-0.004878998,0.010826111,-0.07312012,-0.032196045,-0.024169922,-0.018966675,0.027862549,0.020553589,0.009208679,0.062683105,-0.013175964,-0.026046753,-0.05419922,0.04196167,-0.03753662,0.004398346,0.05517578,-0.02192688,-0.030090332,0.018829346,-0.026229858,0.009231567,0.031555176,0.017501831,0.033081055,0.06756592,0.041290283,-0.011772156,-0.011474609,0.025268555,0.015670776,-0.013244629,-0.013755798,-0.008178711,-0.031707764,0.01878357,-0.007293701,-0.017181396,-0.072143555,0.07244873,0.05618286,0.06585693,0.01763916,0.015510559,0.023834229,-0.009422302,0.004096985,-0.008026123,-0.024917603,-0.015533447,-0.06781006,0.023010254,-0.0021591187,0.007575989,-0.04019165,0.012451172,0.013534546,0.006046295,-0.023162842,0.06329346,-0.016494751,-0.0059661865,0.03112793,0.017440796,0.03253174,0.04220581,-0.054718018,0.024917603,0.028305054,-0.026123047,0.00023972988,0.015419006,-0.0143966675,-0.012763977,-0.044769287,-0.04333496,-0.012771606,-0.040008545,-0.058441162,-0.00040125847,-0.009056091,0.029174805,0.047088623,-0.014205933,-0.029251099,-0.00033640862,0.00007349253,-0.06298828,-0.0010967255,-0.040649414,0.017105103,0.032989502,-0.037017822,0.014793396,-0.015319824,0.0056762695,0.0005168915,0.024383545,-0.008773804,-0.0039367676,-0.031829834,0.02003479,0.0011444092,0.016815186,0.012001038,0.023391724,0.025283813,0.03616333,0.007080078,-0.0053863525,-0.017425537,-0.05392456,0.020507812,-0.036132812,0.028564453,0.036315918,-0.01776123,0.0007901192,-0.015457153,-0.025985718,-0.020736694,0.010910034,-0.03967285,-0.019958496,0.024963379,-0.0390625,-0.01374054,-0.04333496,-0.03050232,-0.007820129,0.05886841,0.015716553,-0.003850937,-0.047698975,-0.006126404,0.015396118,-0.0023174286,0.005432129,-0.01411438,-0.011634827,-0.0061187744,-0.025848389,-0.028915405,0.0031414032,0.033233643,-0.032409668,-0.012023926,0.00504303,-0.008979797,0.03652954,0.030273438,0.0020599365,0.034088135,-0.015342712,-0.00680542,-0.0038414001,0.028274536,0.010894775,-0.024093628,-0.028152466,0.03213501,-0.0043525696,0.053375244,-0.0357666,-0.014892578,-0.0042037964,0.029067993,0.0046806335,-0.0029087067,0.005760193,-0.0006918907,-0.029174805,-0.084106445,0.030731201,-0.0054779053,0.021133423,0.005466461,0.017562866,0.024459839,-0.00071287155,-0.010772705,0.021438599,-0.047851562,-0.033843994,-0.03326416,-0.01625061,-0.010025024,0.003604889,-0.009460449,0.017913818,0.0025787354,0.02960205,0.007183075,-0.019821167,0.028427124,-0.0026016235,0.0050239563,0.0345459,-0.0010995865,-0.005458832,0.037322998,0.00020730495,-0.018707275,0.032348633,0.0036792755,0.026641846,-0.005970001,0.037200928,0.05038452,-0.0033512115,-0.00050497055,-0.0017690659,-0.005268097,-0.024047852,0.003850937,0.027374268,0.03237915,-0.0012197495,-0.03277588,0.028656006,0.019119263,-0.036834717,-0.024673462,-0.0016355515,0.031433105,-0.041625977,0.0059280396,0.013198853,0.041259766,-0.027359009,0.0038452148,0.011474609,0.039093018,0.041259766,0.0090408325,-0.0010204315,0.008491516,0.0045280457,-0.006576538,0.009231567,-0.012840271,0.008995056,-0.017715454,0.011978149,0.023406982,0.008430481,-0.01777649,-0.033081055,-0.015289307,0.017745972,-0.023605347,0.017990112,0.021072388,0.044525146,-0.026245117,0.037353516,0.032165527,-0.03604126,-0.003326416,0.00447464,0.03253174,0.00919342,-0.00027656555,0.019180298,0.022323608,0.042541504,-0.069885254,-0.018127441,0.007633209,0.031799316,-0.03277588,-0.04977417,-0.041748047,-0.018341064,0.027450562,0.009498596,-0.0024547577,0.025650024,-0.019439697,-0.000039875507,0.0021781921,0.012275696,-0.026306152,0.0010938644,-0.047210693,-0.014602661,-0.0012693405,0.006134033,-0.013648987,0.009719849,-0.018829346,-0.038482666,0.00674057,-0.02583313,-0.00010627508,-0.0068626404,0.010398865,0.043304443,-0.0084991455,0.017028809,-0.027633667,-0.03302002,-0.0047836304,0.013755798,0.021469116,-0.05041504,0.025360107,-0.015655518,-0.0004992485,-0.0059661865,0.0026741028,0.012840271,0.014564514,0.0057754517,0.018615723,-0.05496216,0.03878784,-0.017059326,-0.009101868,-0.012397766,-0.015808105,-0.015823364,-0.020202637,-0.0004451275,0.05166626,-0.0259552,-0.018447876,-0.027526855,-0.062683105,-0.02078247,-0.06365967,0.0138168335,0.006034851,0.025543213,-0.02909851,0.01576233,0.0037136078,0.0009727478,-0.011238098,-0.011276245,-0.0016803741,0.021865845,0.035491943,0.012672424,-0.037719727,-0.028839111,-0.011940002,-0.010803223,-0.024856567,-0.041229248,-0.018966675,-0.008110046,0.005039215,-0.0059013367,-0.012763977,-0.02432251,0.0019464493,-0.039520264,0.031677246,-0.0028705597,0.005077362,-0.0052833557,-0.04562378,0.0048103333,0.01838684,-0.01878357,0.020706177,-0.007247925,-0.013839722,-0.027786255,-0.0036144257,0.025344849,0.012786865,-0.015640259,-0.032165527,0.01322937,-0.025421143,-0.057891846,-0.004108429,-0.02128601,0.018737793,0.0020217896,-0.0079422,-0.045684814,-0.002008438,-0.019577026,-0.00011026859,0.023269653,0.012199402,0.0061569214,-0.006576538,0.021270752,-0.008460999,-0.023651123,-0.04031372,0.008956909,0.010032654,-0.021270752,0.031311035,0.031341553,0.004299164,-0.013519287,0.019348145,-0.00623703,0.008430481,-0.006401062,0.017700195,-0.017669678,0.013549805,-0.0022239685,-0.021820068,-0.025756836,-0.008003235,0.07324219,0.009559631,0.00995636,-0.0009469986,-0.0209198,0.01360321,0.029251099,-0.02078247,0.006580353,-0.033081055,0.018066406,-0.020980835,0.02142334,0.0055618286,0.027740479,-0.035705566,-0.05895996,0.0078048706,-0.011917114,-0.00006097555,-0.06347656,-0.03970337,-0.04537964,0.009117126,-0.023788452,-0.008590698,0.0022716522,-0.0001385212,-0.016098022,-0.07324219,0.0022697449,0.05670166,-0.00043296814,0.022872925,-0.025863647,0.006515503,0.030014038,-0.014511108,0.0023460388,0.015586853,-0.024963379,-0.010299683,-0.032196045,0.03793335,-0.0030498505,-0.031173706,0.02508545,-0.0019664764,0.028808594,-0.013626099,0.010925293,-0.015914917,-0.026321411,-0.001865387,0.004383087,-0.0066337585,-0.0051574707,0.037109375,-0.028503418,0.022613525,-0.010948181,0.00242424,-0.0034542084,0.017044067,0.03793335,-0.026000977,-0.01234436,0.012619019,-0.0006046295,0.039489746,-0.032165527,0.044921875,0.01322937,-0.019424438,0.005367279,-0.017089844,-0.023010254,-0.030349731,-0.018661499,0.021560669,0.01512146,0.0026779175,-0.004169464,-0.0025939941,-0.0022602081,0.009017944,0.012199402,0.0007853508,-0.020828247,-0.027633667,0.000015735626,0.02279663,0.02293396,0.010574341,0.01637268,0.028457642,0.04498291,-0.024276733,-0.021987915,-0.006401062,0.039093018,0.0009036064,-0.0074157715,0.021987915,0.007774353,0.006877899,0.019195557,0.0071792603,-0.03137207,-0.023727417,-0.016311646,-0.027374268,0.0013847351,0.00047945976,0.015434265,0.004917145,0.0029888153,-0.00018918514,-0.031021118,-0.006088257,-0.037994385,-0.014549255,-0.0025844574,0.0067367554,0.020202637,0.0002849102,0.0018606186,0.02796936,0.002878189,0.032409668,0.009391785,-0.012062073,0.031402588,0.04147339,-0.0012655258,-0.030303955,-0.015007019,-0.013267517,-0.0038585663,0.0031490326,-0.015434265,0.02180481,0.03866577,-0.029693604,0.0181427,0.00843811,0.020553589,-0.015586853,0.007774353,-0.013763428,0.020965576,0.0015668869,0.027557373,-0.06341553,0.024963379,0.020095825,0.0049209595,-0.004611969,-0.01361084,-0.017990112,0.013587952,0.0054969788,-0.00831604,0.03024292,-0.020523071,0.023071289,-0.014854431,-0.02456665,0.013664246,-0.022628784,-0.04269409,0.017181396,-0.003665924,-0.007183075,0.004924774,-0.02053833,0.043426514,-0.022598267,-0.0006685257,0.005256653,-0.004261017,-0.015823364,-0.027923584,0.01638794,-0.042388916,-0.016220093,-0.010757446,-0.013679504,0.052001953,0.0463562,0.019485474,0.032562256,0.0022449493,-0.019348145,-0.04800415,-0.053833008,0.015319824,-0.019165039,0.021591187,-0.01977539,0.06323242,0.040527344,0.016204834,0.034454346,0.04296875,0.038391113,-0.0010442734,0.007369995,-0.026031494,0.013000488,-0.018814087,0.0014266968,0.0035858154,0.039031982,-0.034057617,-0.0036716461,0.009712219,0.031982422,-0.011230469,0.02658081,0.072509766,0.02180481,-0.007659912,0.02104187,-0.0040664673,-0.021072388,-0.0039482117,-0.012306213,0.05429077,0.0017461777,0.03326416,0.048553467,0.0063323975,0.0067863464,0.02281189,-0.028457642,-0.016357422,0.037261963,0.02243042,-0.00079774857,-0.0012617111,-0.0068244934,0.0037937164,-0.048797607,-0.031982422,0.012489319,0.00756073,0.012336731,-0.000562191,-0.0063285828,0.00040245056,0.02229309,0.009933472,0.017547607,0.0018072128,-0.0044898987,0.020248413,-0.0129852295,0.03805542,-0.0029201508,0.009155273,-0.025497437,-0.039764404,0.015396118,-0.0033454895,0.0014839172,-0.017196655,0.03086853,0.03024292,0.036224365,0.035491943,-0.016540527,0.014282227,0.035003662,0.017852783,0.024398804,0.045715332,0.018814087,-0.0028419495,0.027175903,0.03881836,0.027664185,-0.0098724365,0.012329102,0.014457703,-0.005680084,0.0063209534,-0.0072288513,0.0042877197,-0.006500244,0.0023918152,-0.008216858,-0.009376526,0.023345947,0.02520752,0.0016698837,0.01008606,0.010513306,0.009895325,0.0030651093,0.0096206665,0.0040283203,-0.0184021,0.031982422,0.0135650635,0.03668213,0.001124382,0.025924683,-0.0056533813,-0.0049743652,-0.016098022,0.016143799,-0.04522705,0.015357971,-0.0010547638,-0.012161255,-0.03338623,0.021331787,-0.0032138824,-0.006462097,0.03970337,0.00982666,-0.019744873,0.008407593,0.03302002,0.015777588,-0.008232117,0.005680084,-0.021591187,0.027709961,0.053009033,0.013320923,-0.0074653625,-0.034851074,0.007183075,0.011154175,-0.003206253,-0.008712769,-0.0002156496,-0.015113831,-0.035614014,0.02456665,0.03213501,0.012763977,0.038391113,-0.015930176,-0.024642944,0.008148193,0.015419006,0.0049362183,0.00057792664,-0.018310547,0.021408081,-0.017913818,0.048736572,0.04510498,0.01436615,0.020904541,-0.0024547577,-0.008430481,-0.0014753342,-0.01374054,0.0062065125,-0.027999878,0.0129776,-0.008911133,0.027526855,-0.020629883,-0.016647339,-0.010681152,-0.01701355,-0.035339355,-0.019363403,0.028762817,0.014175415,0.034210205,0.027359009,0.024002075,-0.025604248,0.06173706,-0.023040771,0.040405273,-0.011199951,-0.0127334595,0.064086914,0.041870117,0.035888672,0.005104065,0.014762878,-0.031951904,-0.002363205,0.033599854,0.02017212,0.015808105,-0.01171875,-0.03302002,0.037719727,-0.0036888123,0.016082764,-0.027923584,0.0053977966,0.018951416,-0.0075302124,-0.03567505,-0.0049552917,-0.007446289,0.0004222393,0.04156494,-0.034423828,-0.034301758,-0.01499939,-0.018844604,0.024719238,-0.009147644,-0.0035190582,0.005001068,-0.021942139,0.011558533,-0.0018939972,-0.015136719,0.0043296814,0.03805542,-0.024978638,-0.0010795593,-0.0020313263,0.026245117,-0.027740479,0.02520752,0.029769897,-0.0026397705,0.004802704,0.034851074,-0.004989624,0.03503418,-0.02619934,0.03729248,0.04348755,0.0063095093,-0.005405426,0.011604309,0.024093628,-0.016403198,0.024017334,0.03173828,0.005306244,0.014152527,0.014793396,-0.006576538,0.009315491,0.005432129,-0.017990112,0.0068511963,-0.011077881,-0.026306152,0.008590698,0.017181396,0.004497528,0.006450653,0.004814148,-0.0068206787,0.0022735596,0.03829956,0.025177002,-0.042633057,0.0024166107,0.0036697388,-0.0017957687,-0.024383545,-0.011039734,0.014625549,-0.051849365,0.015289307,0.028305054,0.002105713,0.0061798096,-0.022979736,-0.0032482147,0.029586792,0.025222778,0.019058228,0.000166893,0.0075569153,0.01360321,-0.011436462,-0.013397217,-0.00995636,-0.013038635,0.0030136108,0.027786255,-0.015060425,-0.025360107,0.016921997,0.0028800964,0.0050354004,0.0010461807,0.0032844543,0.041656494,0.00819397,-0.0016155243,-0.0014753342,0.009162903,-0.015487671,-0.034088135,-0.025115967,0.011413574,0.050872803,-0.009918213,-0.014213562,0.0062294006,0.035888672,0.019363403,0.028167725,-0.006134033,0.048858643,0.015914917,0.0006136894,-0.041046143,0.00092220306,-0.018981934,-0.027999878,0.026489258,-0.031707764,-0.019348145,0.009284973,-0.0002220869,-0.005630493,-0.021881104,-0.0034103394,-0.011405945,-0.033996582,0.03237915,-0.0025024414,-0.00054454803,-0.03793335,0.004547119,0.013282776,-0.022003174,-0.035705566,-0.009895325,-0.013793945,-0.02017212,-0.056488037,0.025161743,-0.024749756,0.00066280365,-0.005619049,0.017059326,-0.004814148,0.036621094,0.0013561249,-0.0008764267,-0.002571106,0.022262573,0.020370483,0.002784729,0.024246216,-0.044647217,-0.03302002,-0.012741089,-0.005645752,-0.013000488,0.029510498,-0.0031661987,0.023391724,-0.0036506653,-0.011314392,0.0031929016,0.0047073364,-0.020553589,-0.012641907,-0.018432617,-0.035095215,0.009155273,0.026428223,-0.0059127808,0.009376526,0.035888672,-0.007827759,-0.01512146,0.01902771,0.038146973,0.0059814453,0.037750244,-0.0020771027,-0.003271103,-0.025299072,-0.004295349,-0.022628784,0.014846802,0.0050315857,0.00806427,-0.012435913,0.028381348,0.007583618,-0.010543823,0.010971069,0.015022278,0.019424438,-0.009597778,0.028427124,0.010139465,0.004486084,-0.013252258,-0.005958557,0.00983429,0.030731201,0.016174316,0.015991211,-0.016311646,0.0048065186,-0.0053100586,0.0020484924,0.010765076,-0.018341064,-0.03189087,-0.018447876,-0.035003662,-0.00062704086,-0.0098724365,0.009414673,-0.0070610046,0.031097412,0.0010299683,-0.04324341,-0.009101868,0.022140503,0.0023078918,-0.00034928322,0.004776001,0.015571594,-0.00881958,-0.030944824,0.007911682,-0.06463623,-0.04421997,-0.00058984756,-0.015853882,0.016052246,-0.0030937195,-0.013198853,0.010902405,-0.0057868958,-0.009681702,0.004673004,0.026504517,-0.0010099411,-0.0021858215,0.0029907227,0.02645874,-0.0043182373,0.0065994263,-0.02305603,-0.002008438,0.01637268,-0.014328003,0.024658203,-0.005279541,0.022399902,0.0017356873,-0.01977539,0.0059661865,-0.0035305023,0.005218506,-0.043762207,0.0029296875,0.012283325,-0.02331543,-0.0010547638,-0.016220093,-0.040039062,-0.019210815,-0.010292053,-0.02507019,0.026245117,0.03527832,0.030380249,0.01007843,0.04321289,-0.029632568,-0.009437561,0.0006752014,0.0029563904,-0.030944824,-0.0063552856,0.030715942,-0.0002617836,-0.019882202,-0.017196655,0.001578331,-0.030731201,-0.028503418,0.0063209534,-0.004825592,-0.0043258667,0.016220093,0.031951904,0.034332275,0.007144928,0.01259613,0.02027893,0.0050621033,0.01638794,0.002620697,0.049591064,0.0018873215,-0.032989502,-0.0036468506,0.010925293,-0.0101623535,-0.014572144,-0.008216858,-0.005378723,-0.03933716,-0.001420021,-0.012168884,0.04159546,-0.006679535,0.025512695,-0.015914917,-0.013214111,-0.035339355,0.002067566,-0.0390625,-0.0005068779,0.04434204,0.0154953,0.0068130493,-0.017028809,-0.035125732,0.019897461,0.013343811,0.0076141357,-0.044158936,-0.016967773,0.011077881,-0.0005469322,0.009101868,0.013114929,-0.030807495,-0.021148682,-0.0050621033,0.0020160675,-0.002483368,-0.0035705566,0.0063819885,0.00032520294,-0.010040283,0.0121536255,0.031585693,-0.00085544586,-0.004535675,-0.008460999,-0.003074646,0.03741455,0.04220581,-0.014930725,0.025421143,0.022750854,-0.04159546,0.053009033,-0.029968262,0.01663208,-0.015548706,0.0026416779,-0.030731201,-0.011482239,-0.009887695,-0.016647339],"createdAt":"2026-04-21T18:32:12.868Z","updatedAt":"2026-04-22T01:02:05.664Z","lastSeenAt":"2026-04-22T01:02:05.664Z","tsv":"'/api':171 '/api/v1/emails/68':51 '/docs':169 '/emails/68':201 '/pricing':170 '/readme':173 '0.02':9,26,110 '000':114 '0x8335':101 '20':113 '2913':102 '6':118 'Base USDC API' 'accept':88 'access':42 'actual':203 'ai/ml':70 'analyt':69 'api':16,33,41,121 'attach':132 'avail':163,226 'base':7,24,84,104,115 'behind':79 'broader':56 'call':65 'caller':130 'cannot':221 'captur':149 'challeng':146 'commit':127 'confirm':150 'connect':179 'contract':100 'cost':108 'crypto':73 'data':68 'decim':119 'descript':197 'detail':186 'determin':223 'document':155 'dozen':60 'email':4,21,214,216,218 'email API' 'endpoint':5,22,36,66,87,152,164,211 'etc':220 'expect':209 'extrem':157 'financ':72 'gate':3,20,78 'header':137 'http':89 'http-post' 'infer':71 'input':207 'json':94 'json-response' 'key':17,34,122 'land':160 'limit':124 'list':162 'live':154 'lookup':215 'lowpaymentfee' 'lowpaymentfee.com':38 'materi':227 'maximum':107 'micropay':81 'micropayment email' 'network':85 'no-api-key' 'offer':59 'openapi':190 'page':161 'part':53 'pay':8,25,63 'pay-per-cal':62 'pay-per-call email' 'pay-per-request' 'payment':46,95,136,142 'per':10,27,64,111 'platform':57 'post':90 'premium':40 'price':166 'proof':143 'protocol':47 'provid':39 'purpos':213 'rate':123 'render':176 'request':11,28,91,112 'request/response':193 'requir':129 'resourc':50,202 'return':93,204 'rout':174 'schema':194 'send':217 'servic':76 'settl':97 'simpli':131 'span':67 'spars':158 'spec':191 'specif':49 'stub':181 'success':148 'technic':185 'unit':116 'upfront':126 'usdc':13,30,99 'usdc-base' 'util':75 'valid':140,219 'via':43 'wallet':180 'x':135 'x-payment':134 'x402':2,19,45,80,141,145 'x402 email' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"3a066ef0-ef1f-457d-9252-52067c7f9788","listingId":"21426c93-e421-46fb-a544-4c8f3d3e5bf3","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.868Z"}],"sources":[{"listingId":"21426c93-e421-46fb-a544-4c8f3d3e5bf3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.868Z","lastSeenAt":"2026-04-22T01:02:05.664Z"}],"details":{"listingId":"21426c93-e421-46fb-a544-4c8f3d3e5bf3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/68 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/emails/68"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages render only a 'Connect wallet' stub with no technical documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing email-related data or functionality via a single micropayment per call","Integrating pay-per-use email services into agent workflows without managing API keys","Programmatic email operations settled on Base L2 in USDC"],"bestFor":["Developers wanting key-free, pay-per-call email API access","AI agents that can settle x402 micropayments on Base","Users who prefer crypto-native API billing with no subscriptions"],"notFor":["Anyone needing detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.13Z"},"updatedAt":"2026-04-22T01:02:05.664Z"}}