{"id":"94837fd6-d933-4fbb-a6a6-65383eddb438","shortId":"3pjkD3","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 lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/23`) using the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint accepts POST requests and returns `application/json` responses. The x402 version is 1, using the \"exact\" payment scheme with a 300-second timeout.\n\nThe specific functionality of the `/api/v1/emails/23` endpoint is not documented on the site — the landing page lists analytics, AI, finance, and utility endpoints but does not mention email-specific APIs. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional documentation. As a result, the exact request format and response schema for this particular endpoint are unknown and must be discovered by the caller.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","email-data","json-response","no-api-key","post-method"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","Base network API","micropayment API","pay-per-request email","lowpaymentfee"],"warnings":["The /api/v1/emails/23 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose is unclear.","No API documentation is available; docs, pricing, and README pages all render only a 'Connect wallet' prompt with no useful content.","Request and response schemas are completely unknown — no OpenAPI spec, no examples, no field descriptions.","The specific resource '/emails/23' suggests a hardcoded or demo resource ID; it may not represent a general-purpose email API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/23","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/23","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 no documentation for the /api/v1/emails/23 endpoint — no request schema, no response schema, no examples, and the email endpoint is not even listed on the provider's landing page. All docs/pricing/README 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":"2026-04-21T19:05:48.819Z","embedding":[-0.0134887695,-0.01159668,0.06286621,0.01134491,0.017745972,-0.051208496,-0.024230957,0.02859497,0.06896973,-0.0758667,0.030075073,-0.03314209,-0.044006348,-0.03982544,-0.042938232,0.010429382,0.015792847,-0.024139404,-0.023239136,0.0042800903,0.030639648,-0.034057617,-0.027374268,0.030090332,-0.0061454773,-0.016067505,-0.035095215,-0.0016050339,0.010383606,-0.049682617,0.026657104,-0.030975342,-0.01499939,0.015419006,-0.020584106,0.029724121,-0.010864258,0.030685425,0.016036987,-0.0012550354,0.0063095093,-0.0418396,0.005317688,-0.003200531,-0.054656982,-0.017974854,0.0030345917,-0.020767212,0.0289917,0.0040397644,-0.012237549,-0.005168915,0.0041885376,-0.0054969788,0.013389587,0.028961182,0.011520386,0.004196167,0.003396988,0.025604248,0.0054626465,-0.08502197,-0.03366089,-0.026779175,0.0043182373,0.06161499,-0.01940918,0.03024292,0.019058228,0.08062744,0.020111084,0.06695557,0.042907715,0.009063721,-0.00048089027,-0.02960205,-0.0071144104,0.024276733,-0.03363037,-0.037597656,-0.024902344,-0.018035889,-0.038757324,-0.012435913,-0.021057129,-0.054534912,0.00006920099,0.030593872,-0.024459839,0.0206604,-0.1027832,-0.011978149,0.009208679,0.0048599243,0.010635376,-0.008049011,-0.020751953,-0.007987976,-0.0007071495,0.014297485,0.017791748,-0.033691406,0.018432617,0.0029258728,0.028396606,0.034332275,0.028701782,0.015541077,0.022720337,-0.0032215118,-0.02835083,-0.00038433075,-0.0074920654,-0.015586853,0.008110046,-0.0003709793,-0.019042969,0.018508911,-0.034576416,0.02029419,-0.020568848,0.047790527,0.00055265427,0.010734558,0.012496948,-0.035949707,-0.0211792,0.008102417,-0.012214661,0.019241333,0.03967285,0.02444458,0.05404663,-0.025238037,-0.029525757,0.0138549805,-0.017486572,-0.007659912,-0.049713135,-0.038024902,0.05847168,-0.014167786,0.019012451,0.041107178,-0.08270264,-0.01878357,-0.029632568,-0.004131317,0.0028152466,-0.006641388,-0.0031108856,0.006549835,0.0016956329,0.002363205,-0.019958496,-0.012130737,0.013710022,0.034423828,-0.010238647,0.032073975,0.0030708313,0.012626648,0.027252197,-0.009407043,0.010215759,0.03326416,0.0070266724,-0.06414795,-0.05984497,-0.018249512,-0.0052719116,-0.02142334,-0.031219482,0.025375366,-0.014350891,-0.058624268,0.0054473877,0.00008255243,-0.006755829,-0.03756714,-0.0032043457,-0.037628174,-0.015541077,-0.0043754578,-0.061798096,-0.017074585,-0.011474609,0.07110596,0.028503418,0.014434814,0.045440674,-0.02633667,0.025161743,0.031982422,-0.04171753,-0.0093688965,0.027786255,-0.018356323,0.0015230179,0.034454346,0.010322571,-0.022003174,0.033294678,0.06854248,0.0079956055,-0.019973755,-0.009269714,-0.0395813,-0.02859497,-0.013542175,0.023254395,0.0005078316,-0.0013132095,0.02835083,-0.031982422,-0.027374268,-0.00522995,0.00415802,0.006088257,0.055389404,0.023956299,0.0007662773,0.023620605,0.016021729,-0.042816162,0.019622803,0.038330078,0.0063705444,-0.014030457,-0.019470215,0.028625488,0.022872925,-0.0005841255,0.02520752,-0.015060425,0.034057617,-0.012680054,0.0068740845,0.017303467,0.012161255,-0.03640747,-0.038909912,-0.029037476,0.03225708,-0.0037193298,-0.015914917,-0.026412964,-0.06536865,0.043304443,0.048583984,0.026535034,-0.0115737915,0.02305603,-0.037841797,-0.032440186,-0.078186035,0.053619385,0.07110596,-0.0042152405,-0.015975952,0.035827637,-0.01838684,-0.02911377,0.031829834,-0.0062217712,-0.04849243,-0.0211792,-0.0036449432,-0.05734253,0.008804321,0.010116577,0.03829956,0.05239868,-0.009742737,-0.040985107,-0.0054473877,0.0062179565,-0.0059890747,-0.011665344,-0.012435913,-0.0036506653,0.024093628,0.014793396,-0.029464722,0.022949219,-0.0056114197,-0.0023345947,0.0015106201,0.013885498,-0.030044556,-0.014793396,0.0059432983,0.0020217896,-0.06088257,-0.015609741,-0.0008301735,0.048797607,-0.03894043,0.043121338,-0.000045359135,-0.010536194,0.06274414,0.00047183037,-0.04751587,-0.01399231,0.012329102,0.0256958,0.059173584,0.00579834,-0.00074386597,-0.007888794,0.06774902,-0.01084137,-0.009635925,0.00071048737,0.031402588,0.018722534,0.015899658,-0.06829834,-0.038848877,-0.009803772,0.0031661987,0.024002075,-0.030654907,0.024246216,0.017044067,0.008049011,-0.019607544,-0.016571045,-0.025802612,-0.0065727234,-0.034423828,0.008743286,-0.029159546,0.022460938,0.03277588,-0.006877899,-0.006793976,0.0073013306,0.03930664,0.0015077591,-0.0016813278,-0.02053833,-0.042999268,-0.031402588,-0.02104187,-0.019821167,0.01876831,0.011634827,0.029556274,-0.057281494,0.024124146,0.040893555,0.022598267,0.018096924,0.0026245117,0.010116577,-0.10076904,-0.03326416,-0.025512695,-0.004714966,0.02947998,0.03781128,-0.007904053,0.068847656,0.000035583973,-0.04309082,-0.059906006,0.03793335,-0.03656006,0.00667572,0.050323486,-0.018920898,-0.005329132,0.008514404,-0.02027893,-0.00066137314,0.049621582,0.019042969,0.03918457,0.07183838,0.046691895,-0.02508545,-0.011619568,0.029846191,0.014671326,-0.009925842,-0.002729416,-0.015304565,-0.040863037,0.023971558,0.0048675537,-0.007911682,-0.0680542,0.066223145,0.068359375,0.07623291,0.03503418,0.019561768,0.016662598,-0.013084412,0.00027489662,-0.0039863586,-0.03137207,-0.01701355,-0.05267334,0.016357422,-0.013572693,0.021224976,-0.035614014,0.016738892,-0.003271103,0.016036987,-0.022064209,0.04888916,-0.011138916,-0.001996994,0.02960205,0.012458801,0.03250122,0.034240723,-0.035339355,0.034332275,0.02609253,-0.031677246,-0.002483368,0.028900146,-0.017471313,-0.01713562,-0.052246094,-0.031951904,-0.0044441223,-0.024963379,-0.046569824,-0.006614685,-0.0044555664,0.012245178,0.0579834,-0.01007843,-0.032440186,-0.0070152283,-0.0066604614,-0.053619385,0.005680084,-0.037841797,0.015487671,0.028717041,-0.026565552,0.015975952,-0.003156662,-0.0008444786,-0.014915466,0.007255554,0.010177612,-0.0027198792,-0.022460938,0.019134521,-0.009475708,0.012924194,0.0029277802,0.022750854,0.0024318695,0.05114746,0.027496338,-0.011810303,-0.025817871,-0.05126953,0.037322998,-0.055236816,0.026000977,0.050720215,-0.018249512,-0.0029029846,-0.004878998,-0.02444458,-0.029083252,0.014251709,-0.051116943,-0.015022278,0.018981934,-0.021240234,-0.018325806,-0.04537964,-0.013694763,-0.014762878,0.029067993,0.026016235,-0.003660202,-0.06744385,-0.009132385,0.005607605,-0.004261017,0.0036640167,-0.012275696,-0.019195557,-0.0053710938,-0.03149414,-0.012718201,-0.0005531311,0.025848389,-0.007801056,-0.015777588,0.015266418,-0.0037288666,0.05307007,0.033599854,0.014556885,0.036254883,-0.026855469,0.0025863647,0.019119263,0.06185913,0.013168335,-0.02394104,-0.04699707,0.029312134,0.01146698,0.03869629,-0.032073975,-0.012329102,-0.018341064,0.02619934,0.004009247,0.004447937,0.002532959,-0.021514893,-0.049865723,-0.082336426,0.02116394,-0.0054016113,0.033050537,0.0047836304,0.004550934,0.020263672,-0.00025057793,-0.010246277,0.026367188,-0.029586792,-0.030044556,-0.029067993,-0.021453857,-0.014030457,-0.01612854,-0.014419556,0.020935059,0.008453369,0.032989502,0.023803711,-0.015777588,0.018112183,-0.004196167,0.013572693,0.020935059,-0.0124053955,-0.0017414093,0.034210205,0.007827759,-0.041778564,0.023376465,0.0064849854,0.024246216,-0.010238647,0.04486084,0.061279297,0.0069847107,0.00046992302,-0.0013828278,-0.0013275146,-0.026824951,0.014129639,0.0027198792,0.011680603,-0.013069153,-0.036132812,0.011756897,0.012908936,-0.042236328,-0.027770996,-0.0034732819,0.02168274,-0.03390503,0.009063721,0.015045166,0.04071045,-0.024246216,0.009979248,0.017288208,0.04019165,0.040374756,0.00011467934,0.0044288635,0.020858765,0.0020961761,-0.0027599335,0.008300781,-0.013404846,0.011184692,-0.0040245056,0.01876831,0.027145386,-0.01020813,-0.004550934,-0.015945435,-0.01991272,0.015792847,-0.024093628,0.0079574585,0.034484863,0.033081055,-0.03012085,0.010124207,0.008956909,-0.02015686,-0.003314972,0.0028591156,0.022872925,0.004989624,-0.019866943,0.016418457,0.022994995,0.026046753,-0.059020996,-0.020629883,-0.000626564,0.023223877,-0.044891357,-0.028701782,-0.04586792,-0.003704071,0.024856567,0.01171875,0.017150879,0.035308838,-0.022521973,0.0005774498,0.016586304,0.026535034,-0.023880005,0.004211426,-0.038208008,-0.008850098,0.0007777214,0.0065727234,-0.021102905,0.0068244934,-0.0131073,-0.037872314,0.0022182465,-0.02243042,0.0047416687,-0.010437012,0.0006041527,0.04119873,-0.009239197,0.013710022,-0.026412964,-0.048950195,-0.009170532,0.014984131,0.01109314,-0.054840088,0.0077705383,-0.011459351,-0.004673004,0.012619019,0.0042648315,0.026046753,0.015144348,0.014038086,0.030532837,-0.07147217,0.038208008,-0.013954163,0.009849548,-0.007888794,-0.025848389,-0.016174316,-0.015380859,0.0021743774,0.04989624,-0.025283813,-0.033569336,-0.025924683,-0.061950684,-0.011810303,-0.05822754,0.018798828,0.012550354,0.02394104,-0.00843811,0.02255249,0.008651733,0.0054016113,-0.019012451,-0.0002822876,-0.005844116,0.020462036,0.032226562,0.01222229,-0.038970947,-0.039794922,-0.02067566,-0.004901886,-0.0143966675,-0.05105591,-0.009643555,-0.015548706,0.008552551,-0.007980347,-0.012298584,-0.01083374,-0.0143966675,-0.044525146,0.038970947,-0.0027370453,0.011817932,-0.0032196045,-0.034729004,-0.0070152283,0.00447464,-0.00491333,0.01676941,0.0009036064,-0.004966736,-0.0071372986,0.014030457,0.02154541,0.014297485,-0.0021247864,-0.020050049,0.00039815903,-0.013221741,-0.061309814,-0.0035171509,-0.003320694,-0.00491333,-0.015777588,-0.0049972534,-0.035827637,0.021087646,-0.005695343,-0.0066604614,0.024765015,0.002336502,0.0039787292,-0.003408432,0.016967773,-0.0008149147,-0.029876709,-0.036956787,0.032073975,0.008842468,-0.014572144,0.038085938,0.034423828,0.0046424866,-0.022140503,0.016845703,0.0018224716,0.0027885437,-0.011291504,0.010658264,-0.013694763,0.01713562,-0.0014562607,-0.03390503,-0.02545166,-0.015960693,0.072753906,0.0028018951,-0.019927979,-0.0059509277,-0.02722168,0.008911133,0.030334473,-0.019241333,0.0051879883,-0.013786316,0.0041122437,-0.027694702,0.023132324,-0.0007915497,0.028961182,-0.02015686,-0.04611206,-0.01008606,-0.017562866,-0.019699097,-0.05493164,-0.037475586,-0.04525757,0.020629883,-0.029266357,-0.004085541,0.008766174,0.0005145073,-0.017440796,-0.069885254,0.009552002,0.04171753,-0.0004014969,0.02746582,-0.026977539,0.0009741783,0.017211914,-0.021240234,0.000995636,0.024612427,-0.03768921,0.0016098022,-0.02835083,0.022491455,-0.0041007996,-0.008102417,0.013069153,-0.01158905,0.027053833,-0.018035889,0.016906738,-0.02368164,-0.010940552,-0.019042969,0.01373291,-0.008132935,-0.0008215904,0.035614014,-0.027267456,0.025817871,-0.010696411,-0.009963989,0.007083893,0.020614624,0.038330078,-0.022125244,-0.0021247864,-0.009170532,0.0022125244,0.044799805,-0.028823853,0.031036377,0.015777588,-0.018218994,0.020111084,-0.016845703,-0.0234375,-0.037506104,0.0001436472,0.032196045,0.0103302,0.0020751953,-0.01966858,0.022369385,-0.014480591,0.0011529922,0.016967773,0.0141067505,-0.019104004,-0.034423828,0.0017194748,0.0079574585,0.013893127,0.0034160614,0.0234375,0.012413025,0.030029297,-0.01171875,-0.026245117,-0.010917664,0.029434204,0.0066452026,-0.0051345825,0.027328491,-0.0042266846,-0.002155304,0.02394104,-0.005504608,-0.041412354,-0.013008118,-0.02230835,-0.026809692,-0.0056991577,0.0011863708,0.0090789795,0.0014095306,0.0037612915,-0.005859375,-0.020080566,-0.010803223,-0.02810669,-0.012435913,-0.00048089027,-0.000172019,0.028961182,0.008804321,0.017684937,0.01600647,0.00011909008,0.013511658,0.017364502,-0.010368347,0.034332275,0.025756836,-0.00579834,-0.01940918,-0.018630981,-0.0007176399,0.0051231384,-0.006843567,-0.029556274,0.011817932,0.043151855,-0.017440796,0.023468018,0.011177063,0.020248413,-0.01727295,0.0035972595,-0.011184692,0.028030396,0.0047454834,0.014633179,-0.050750732,0.029586792,0.013633728,-0.0060424805,-0.017120361,-0.0049705505,-0.022598267,0.023880005,0.010292053,0.004840851,0.028915405,-0.0040512085,0.030319214,-0.009048462,-0.005519867,0.010002136,-0.03161621,-0.029968262,0.025512695,0.005657196,0.0063705444,0.013969421,-0.02494812,0.048187256,-0.016860962,0.021392822,-0.008987427,-0.008796692,-0.015045166,-0.019165039,0.0039863586,-0.036346436,-0.028137207,0.0052108765,-0.0105896,0.062347412,0.02708435,0.030166626,0.047302246,0.008972168,-0.018569946,-0.04385376,-0.04724121,0.023025513,-0.006259918,0.028915405,-0.012489319,0.04260254,0.039001465,0.009765625,0.023880005,0.03390503,0.032806396,-0.0051841736,0.009117126,-0.021560669,-0.0018367767,-0.02468872,0.005317688,0.0034942627,0.043121338,-0.031082153,0.020050049,0.018035889,0.033477783,-0.02293396,0.024429321,0.06561279,0.007827759,-0.008613586,0.02999878,0.00015962124,-0.041137695,0.0056991577,-0.017868042,0.04663086,0.018310547,0.032318115,0.044189453,0.02142334,-0.007972717,0.011383057,-0.042999268,-0.008460999,0.045288086,0.031311035,-0.018157959,-0.014732361,-0.0026340485,0.0060577393,-0.059509277,-0.033966064,0.018478394,-0.0016050339,0.0056152344,-0.009887695,-0.009048462,-0.0072669983,0.032196045,0.013946533,0.019302368,-0.003900528,0.017318726,0.035247803,-0.009277344,0.040374756,-0.008781433,0.009185791,-0.0211792,-0.04937744,0.018753052,-0.005256653,-0.008033752,-0.024612427,0.030838013,0.011772156,0.044403076,0.042877197,-0.015586853,0.022232056,0.041107178,0.011390686,0.008705139,0.05114746,0.022338867,-0.0035419464,0.03149414,0.018737793,0.02545166,-0.008338928,0.024978638,0.012428284,-0.0073509216,0.006954193,0.00094509125,0.0022945404,-0.004550934,0.019042969,-0.016204834,-0.008224487,0.013809204,0.03048706,0.0057640076,0.0017566681,0.00945282,0.0014486313,-0.0028457642,0.010101318,0.010017395,-0.01033783,0.0390625,0.021713257,0.040618896,-0.001964569,0.024536133,-0.006565094,-0.006877899,-0.024810791,0.032989502,-0.05331421,0.019165039,-0.007633209,-0.015655518,-0.038604736,0.023666382,0.01335144,-0.019104004,0.04449463,0.0066223145,-0.019241333,0.004875183,0.036346436,0.018295288,0.0017719269,0.014076233,-0.026611328,0.021865845,0.056030273,0.02255249,0.0014715195,-0.03994751,-0.004470825,0.008956909,0.006290436,-0.015777588,-0.009712219,-0.005252838,-0.03591919,0.028869629,0.024429321,0.007297516,0.03955078,-0.0049591064,-0.009719849,0.01902771,0.025802612,0.0035743713,-0.014274597,-0.016143799,0.01134491,-0.015419006,0.038360596,0.042114258,0.015419006,0.034454346,0.0053100586,-0.016540527,0.0021133423,-0.0050582886,0.018798828,-0.014678955,0.00053310394,-0.00592041,0.035461426,-0.025650024,-0.007987976,-0.00062704086,-0.019119263,-0.036193848,-0.020263672,0.011444092,0.021209717,0.04425049,0.031219482,0.018630981,-0.033203125,0.053894043,-0.02470398,0.03552246,0.00058221817,-0.0093688965,0.048828125,0.028381348,0.029708862,0.00868988,0.020462036,-0.041015625,0.009086609,0.033447266,0.018295288,0.018493652,-0.010437012,-0.03262329,0.035369873,-0.0009384155,0.019592285,-0.026412964,0.0001872778,0.01121521,-0.0021038055,-0.02003479,0.00060892105,-0.008171082,-0.008224487,0.025817871,-0.032196045,-0.025009155,-0.015106201,-0.0023880005,0.022369385,-0.015075684,-0.009475708,0.0063323975,-0.0135650635,0.008255005,-0.0027484894,-0.032196045,0.010902405,0.034362793,-0.030731201,-0.0009522438,-0.0040016174,0.028381348,-0.0115356445,0.030517578,0.03503418,0.00015366077,-0.00005555153,0.038635254,-0.015281677,0.020858765,-0.035217285,0.02645874,0.040802002,0.0026664734,-0.0073890686,0.015403748,0.012268066,-0.024124146,0.025924683,0.031677246,0.00033473969,0.01084137,0.008422852,-0.0014076233,-0.0029125214,0.0071868896,-0.024505615,0.0032615662,-0.011657715,-0.02142334,0.002773285,0.020080566,-0.013427734,0.00415802,-0.015541077,-0.0065231323,0.011734009,0.035736084,0.027511597,-0.03656006,-0.010810852,-0.0014152527,0.0037593842,-0.022201538,-0.014472961,0.020385742,-0.05090332,0.014411926,0.018417358,0.00019657612,0.019958496,-0.020812988,-0.0046081543,0.028152466,0.017105103,0.021377563,0.004886627,0.001411438,0.025131226,-0.0040359497,-0.019561768,-0.014640808,-0.014038086,0.0018529892,0.030075073,-0.0289917,-0.029724121,0.02331543,-0.01209259,0.009178162,-0.0013828278,-0.0071983337,0.034210205,0.00017023087,0.004573822,-0.0096588135,0.0104522705,-0.0211792,-0.027252197,-0.014801025,0.005756378,0.058532715,-0.016799927,-0.010269165,0.02394104,0.030075073,0.013946533,0.029953003,0.00070238113,0.05218506,0.017074585,-0.008651733,-0.031951904,0.011688232,-0.026779175,-0.02420044,0.017166138,-0.035125732,-0.018127441,0.005947113,0.010292053,-0.008354187,-0.019546509,0.00198555,-0.014732361,-0.035186768,0.022521973,-0.0048942566,0.002067566,-0.029312134,0.006801605,-0.003967285,-0.027389526,-0.031555176,-0.009460449,0.009933472,-0.016052246,-0.056121826,0.0141067505,-0.035583496,0.0049972534,-0.018539429,0.001540184,-0.01499939,0.032196045,-0.006008148,-0.0006132126,0.0074920654,0.00793457,0.037506104,-0.000006854534,0.037841797,-0.03652954,-0.045318604,-0.01902771,-0.004295349,-0.009994507,0.037963867,0.013290405,0.0090408325,0.03024292,0.0051116943,0.0011234283,-0.00023591518,-0.016448975,-0.0074424744,-0.028579712,-0.02709961,0.018234253,0.016204834,-0.01499939,0.0033664703,0.037506104,-0.0115737915,-0.023223877,0.0340271,0.038360596,0.0029201508,0.020767212,-0.007522583,-0.0022258759,-0.0058288574,0.0026741028,-0.023803711,0.028900146,-0.0017108917,0.007827759,-0.0140686035,0.028457642,0.021713257,-0.008644104,0.006126404,0.013786316,0.01007843,-0.012397766,0.028549194,0.010223389,0.0072669983,0.00028562546,-0.015235901,0.018798828,0.04284668,0.023757935,0.022094727,-0.005256653,-0.003698349,-0.001876831,-0.010307312,0.0056266785,-0.013587952,-0.034088135,-0.017074585,-0.029464722,-0.0014181137,-0.0073890686,0.004337311,-0.013381958,0.026290894,-0.0063323975,-0.04168701,-0.010192871,0.024810791,0.02204895,0.011772156,-0.0061569214,0.0042762756,-0.0007343292,-0.035095215,0.016189575,-0.066589355,-0.042755127,0.0070648193,-0.011528015,0.020980835,0.0066604614,-0.01109314,0.006690979,-0.008743286,-0.010940552,-0.008155823,0.027420044,-0.015991211,0.0067253113,0.014274597,0.027511597,-0.015258789,0.020324707,-0.028427124,0.0036888123,0.010978699,-0.008804321,0.024383545,0.0012683868,0.02508545,-0.016281128,-0.011177063,0.018981934,-0.008392334,-0.004638672,-0.052978516,0.010772705,0.0024375916,-0.016098022,0.017852783,-0.018066406,-0.027008057,-0.01725769,-0.015167236,-0.018188477,0.010665894,0.026260376,0.030075073,0.004371643,0.0491333,-0.034088135,-0.01159668,-0.0013246536,-0.00039815903,-0.04034424,-0.0064430237,0.017974854,0.001789093,-0.021957397,-0.017959595,-0.0049858093,-0.032806396,-0.025314331,0.00869751,0.0015554428,-0.013824463,0.02619934,0.018661499,0.041931152,-0.0022220612,0.017974854,0.014793396,-0.0022010803,0.012687683,-0.006614685,0.04159546,-0.017715454,-0.0418396,-0.000047922134,-0.00020730495,-0.016235352,-0.022720337,-0.008483887,-0.011177063,-0.041870117,0.009284973,-0.0035533905,0.033447266,-0.012687683,0.023330688,-0.02709961,0.00944519,-0.03451538,-0.0107040405,-0.040252686,0.006095886,0.04147339,0.009300232,0.017684937,-0.016174316,-0.022979736,0.014389038,0.0059394836,0.004055023,-0.038970947,-0.030853271,0.011352539,0.010215759,0.023269653,0.014518738,-0.021911621,-0.019256592,0.017333984,-0.004508972,0.0029773712,0.0008392334,-0.00095272064,0.0016374588,-0.005908966,0.0023155212,0.03543091,-0.007671356,-0.012527466,-0.009284973,-0.0015115738,0.037628174,0.036743164,-0.013160706,0.02468872,0.019180298,-0.035705566,0.059753418,-0.023666382,0.013725281,-0.010612488,0.0032863617,-0.04006958,-0.029067993,-0.0053367615,-0.0077209473],"createdAt":"2026-04-21T18:32:10.920Z","updatedAt":"2026-04-22T10:32:39.114Z","lastSeenAt":"2026-04-22T10:32:39.114Z","tsv":"'/api/v1/emails/23':50,159 '/request':17,34 '0.02':16,33,86,126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '1':143 '20000':118 '300':151 '6':123 'Base network API' 'USDC API' 'accept':132 'access':42 'addit':201 'ai':75,172 'analyt':74,171 'api':41,70,91,184 'application/json':137 'base':9,26,105,119 'base-network' 'broader':61 'call':4,21,69,129 'caller':225 'challeng':113 'commit':98 'connect':196 'contract':109 'crawl':186 'data':6,23,73 'decim':124 'discov':222 'doc':187 'document':163,202 'dozen':64 'email':5,22,46,182 'email API' 'email-data' 'email-rel':45 'email-specif':181 'endpoint':7,24,36,71,131,160,176,216 'equal':125 'exact':146,207 'financ':78,173 'format':209 'function':156 'infrastructur':81 'json-response' 'key':92 'land':168 'learn':77 'limit':95 'list':170 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':76 'maxamountrequir':116 'mention':180 'micropayment API' 'must':220 'network':106 'no-api-key' 'offer':63 'page':169,191 'paid email endpoint' 'part':58 'particular':215 'pay':2,19,67 'pay-per-cal':1,18,66 'pay-per-call' 'pay-per-request email' 'payment':54,100,147 'per':3,20,68,87,128 'platform':62 'post':133 'post-method' 'premium':40 'price':84,188 'prompt':198 'protocol':55 'provid':39 'rate':94 'readm':190 'relat':47 'request':88,134,208 'requir':99 'resourc':48 'respons':138,211 'result':205 'return':136,193 'schema':212 'scheme':148 'second':152 'settl':12,29,102 'site':166 'span':72 'specif':49,155,183 'specifi':114 'timeout':153 'unit':120 'unknown':218 'usd':127 'usdc':14,31,108 'usdc-settlement' 'use':51,107,144 'util':82,175 'version':141 'via':10,27 'wallet':197 'web3':79 'x402':11,28,53,112,140 'x402 email' 'x402-payment'","prices":[{"id":"ad2de5ff-0eb5-4053-9de7-a61fd269c23f","listingId":"94837fd6-d933-4fbb-a6a6-65383eddb438","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.920Z"}],"sources":[{"listingId":"94837fd6-d933-4fbb-a6a6-65383eddb438","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.920Z","lastSeenAt":"2026-04-22T10:32:39.114Z"}],"details":{"listingId":"94837fd6-d933-4fbb-a6a6-65383eddb438","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/emails/23"},{"claim":"The platform lists endpoints for analytics, AI, finance, and infrastructure but does not list any email-specific endpoints.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages returned only 'Connect wallet' with no documentation content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-call payment basis","Integrating pay-per-use email data into agent workflows without API key management","Accessing premium data endpoints with crypto micropayments on Base"],"bestFor":["Agents or developers who want keyless, pay-per-call API access","Users who prefer USDC micropayments on Base over subscription billing","Workflows needing on-demand email data without rate limits"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.612Z"},"updatedAt":"2026-04-22T10:32:39.114Z"}}