{"id":"3aeac980-c595-4b3c-a3fe-c8b35926ef77","shortId":"tQFBkR","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 x402-protocol-gated API access to an email-related resource (specifically `/api/v1/emails/53`). It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys are needed, and the platform advertises no rate limits.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/emails/53` resource actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but the exact functionality behind this specific email endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","json-response","no-api-key"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/emails/53 is unknown — 'Premium API Access' is a generic label","No request or response examples available anywhere in crawled content","The platform lists many endpoint categories but none appear to include an 'emails' category, making this endpoint's role unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what '/api/v1/emails/53' actually does. The crawled docs/pricing/API pages are all empty beyond a wallet connect prompt. 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":"2026-04-21T19:16:52.729Z","embedding":[-0.023620605,-0.0011816025,0.048065186,0.026535034,0.028518677,-0.03579712,-0.01625061,0.0256958,0.06793213,-0.0826416,0.020904541,-0.03265381,-0.04714966,-0.036987305,-0.050872803,0.00007778406,-0.002943039,-0.01651001,-0.031921387,0.024215698,0.050842285,-0.019256592,-0.0158844,0.047210693,-0.013145447,-0.0022888184,-0.024993896,0.008140564,0.0005645752,-0.04824829,0.019592285,-0.030090332,-0.021606445,0.0007529259,-0.019226074,0.031341553,-0.016326904,0.051574707,0.020202637,0.007255554,-0.0009536743,-0.041259766,0.0053863525,0.0027198792,-0.034088135,-0.012466431,0.011367798,-0.030090332,0.0048065186,-0.0051078796,-0.01184845,-0.000051379204,-0.021636963,0.015914917,0.010658264,0.03062439,0.0066490173,-0.0052452087,0.007583618,0.035186768,-0.0015897751,-0.064941406,-0.033111572,-0.019500732,0.011154175,0.04949951,-0.01600647,0.041809082,0.018615723,0.09112549,0.034210205,0.054138184,0.053375244,0.0032482147,-0.0032958984,-0.02998352,0.003929138,0.014190674,-0.022277832,-0.034484863,-0.025741577,-0.021728516,-0.047302246,-0.013206482,-0.031463623,-0.061584473,-0.0126571655,0.034454346,-0.02154541,0.028259277,-0.09857178,-0.00983429,-0.007801056,0.008804321,-0.0037899017,-0.005634308,-0.024719238,-0.0017366409,0.002779007,0.010757446,0.010192871,-0.036834717,0.017532349,0.000869751,0.052459717,0.01663208,0.017715454,0.016036987,0.007827759,-0.0021457672,-0.015205383,0.0023326874,-0.01701355,-0.014602661,0.012023926,-0.0074310303,-0.017044067,0.019882202,-0.024337769,0.02809143,-0.039215088,0.057800293,-0.0048446655,0.004508972,0.009185791,-0.04309082,-0.027175903,-0.010658264,-0.026977539,0.015823364,0.047027588,0.018341064,0.0446167,-0.023010254,-0.026870728,0.028900146,-0.007865906,-0.013374329,-0.052520752,-0.015731812,0.04888916,-0.029327393,0.013015747,0.034484863,-0.086242676,-0.016403198,-0.044158936,0.0149383545,-0.013687134,-0.004459381,0.01876831,0.019836426,0.0021572113,-0.011207581,-0.023544312,-0.015655518,-0.0020561218,0.04522705,0.0028133392,0.021514893,-0.0007171631,0.016921997,0.026916504,-0.002784729,0.0128479,0.04827881,-0.008758545,-0.08026123,-0.05227661,-0.028411865,-0.00064468384,-0.00592041,-0.036193848,0.020492554,-0.010848999,-0.06439209,-0.010314941,0.015731812,-0.0037441254,-0.042419434,-0.010292053,-0.03479004,-0.016189575,-0.004699707,-0.06762695,-0.019210815,-0.010032654,0.0635376,0.014572144,0.00793457,0.02809143,-0.016235352,0.034362793,0.041870117,-0.032226562,-0.025390625,0.022918701,-0.018707275,0.021697998,0.02633667,0.023101807,-0.021484375,0.026138306,0.05886841,0.005558014,-0.02432251,0.01448822,-0.035003662,-0.04055786,-0.0064811707,0.018600464,-0.006290436,-0.02357483,0.00040841103,-0.03741455,-0.033996582,-0.006198883,-0.00983429,0.015380859,0.062438965,0.007949829,0.014533997,0.010803223,0.02494812,-0.036956787,0.038116455,0.03741455,0.014976501,-0.024368286,-0.015838623,0.022109985,0.016311646,-0.005847931,0.015068054,-0.01637268,0.0076026917,-0.013298035,-0.009147644,0.021072388,0.0021095276,-0.028640747,-0.03353882,-0.01335907,0.022537231,0.0014724731,-0.02897644,-0.046173096,-0.058563232,0.05227661,0.06262207,0.008522034,0.008163452,0.015312195,-0.039642334,-0.02760315,-0.072753906,0.04788208,0.066223145,-0.006881714,-0.019439697,0.0423584,-0.020507812,-0.026062012,-0.001750946,0.00043010712,-0.032409668,-0.015319824,-0.00894928,-0.05633545,0.0072288513,0.01361084,0.031799316,0.051574707,-0.0048065186,-0.04724121,-0.0007748604,0.0075531006,0.0050239563,-0.02722168,-0.012664795,0.0008406639,0.0211792,0.026031494,-0.03274536,0.022354126,0.0029621124,0.0068511963,-0.0098724365,0.005580902,-0.0231781,-0.009338379,0.014892578,0.014167786,-0.047027588,0.006767273,0.0003941059,0.0579834,-0.03564453,0.04559326,-0.018692017,-0.0016107559,0.047912598,-0.010612488,-0.05380249,-0.017303467,0.017150879,0.029647827,0.06567383,0.017578125,0.021728516,-0.02142334,0.059814453,-0.004688263,0.004211426,0.00020086765,0.043395996,0.022491455,0.03164673,-0.06713867,-0.04724121,-0.011138916,0.0033111572,0.03677368,-0.03881836,0.019012451,0.013320923,0.008407593,-0.02168274,-0.007709503,-0.048065186,-0.00012648106,-0.01864624,-0.0018720627,-0.033203125,0.0064811707,0.020446777,0.006164551,0.0051078796,-0.0034656525,0.038146973,-0.0020999908,-0.0030460358,-0.01878357,-0.039367676,-0.04940796,-0.021606445,-0.012260437,0.028305054,0.015045166,0.024429321,-0.06011963,0.022506714,0.027297974,0.0058403015,0.028915405,-0.0017251968,0.014045715,-0.09246826,-0.038970947,-0.023635864,-0.008834839,0.04309082,0.038024902,0.009941101,0.058441162,-0.0009841919,-0.036956787,-0.051818848,0.04498291,-0.04345703,0.0011167526,0.052978516,-0.02571106,-0.018127441,0.023971558,-0.016662598,0.015563965,0.038970947,0.02293396,0.03918457,0.0690918,0.053344727,-0.0146102905,-0.013931274,0.031204224,0.013671875,-0.02243042,-0.001490593,-0.009613037,-0.036376953,0.024734497,-0.01448822,-0.021484375,-0.06750488,0.06585693,0.05987549,0.07171631,0.025390625,0.014801025,0.015571594,-0.010696411,0.0000047683716,-0.0041923523,-0.04058838,-0.015602112,-0.06274414,0.013374329,0.004558563,0.012161255,-0.037750244,0.016555786,0.0011234283,0.010185242,-0.019348145,0.0647583,-0.011764526,-0.0048828125,0.024291992,0.0121154785,0.03375244,0.030914307,-0.048980713,0.020874023,0.023849487,-0.030166626,-0.009666443,0.0069465637,0.0037574768,-0.022705078,-0.05117798,-0.039031982,-0.011550903,-0.037719727,-0.06112671,-0.0013084412,-0.004837036,0.032409668,0.04650879,-0.016540527,-0.036468506,0.004131317,-0.004875183,-0.060791016,-0.0059814453,-0.036224365,0.016921997,0.037078857,-0.023147583,0.01374054,-0.012771606,0.0060310364,-0.0007805824,0.016555786,-0.006729126,-0.009628296,-0.03237915,0.007881165,-0.010658264,0.015792847,0.015068054,0.0362854,0.016342163,0.041046143,0.02116394,-0.007484436,-0.026138306,-0.037139893,0.033843994,-0.04510498,0.020568848,0.026489258,-0.010971069,0.01083374,-0.005844116,-0.01083374,-0.019836426,0.014930725,-0.045043945,-0.009925842,0.03286743,-0.025619507,-0.017333984,-0.04840088,-0.033447266,-0.006401062,0.04724121,0.025100708,-0.010864258,-0.03967285,-0.005996704,0.02281189,-0.011421204,0.005241394,-0.013595581,-0.009590149,-0.006427765,-0.033355713,-0.033843994,0.0019760132,0.027526855,-0.025054932,-0.014785767,0.0016965866,-0.01473999,0.036956787,0.021728516,0.000115931034,0.032196045,-0.019241333,0.003320694,0.009353638,0.037597656,0.017822266,-0.01637268,-0.03668213,0.03326416,0.0021038055,0.043151855,-0.039367676,-0.010543823,-0.008598328,0.02444458,0.004196167,-0.008911133,-0.005996704,-0.0038108826,-0.024673462,-0.0758667,0.028335571,-0.004512787,0.015220642,0.0029335022,0.010818481,0.028747559,-0.0009174347,-0.011329651,0.022583008,-0.038604736,-0.03036499,-0.03213501,-0.0138549805,-0.01689148,0.007648468,-0.0077819824,0.022338867,-0.00032615662,0.027450562,0.011726379,-0.022827148,0.022827148,0.007007599,0.002111435,0.036193848,-0.008644104,-0.0022525787,0.04196167,0.006023407,-0.025527954,0.02406311,-0.002544403,0.029022217,-0.0073623657,0.044403076,0.04574585,-0.0045661926,-0.0014467239,0.00047516823,-0.00712204,-0.033233643,0.0067100525,0.018035889,0.037353516,0.0014810562,-0.033111572,0.011619568,0.023773193,-0.03475952,-0.03253174,0.0010480881,0.030029297,-0.046844482,0.0071411133,0.01448822,0.039916992,-0.017669678,0.0040512085,0.009552002,0.04385376,0.0289917,0.005634308,0.006099701,0.009017944,0.008422852,-0.005302429,0.012077332,-0.024368286,0.0043792725,-0.0055351257,0.009147644,0.03161621,0.0055122375,-0.011352539,-0.031433105,-0.020431519,0.021499634,-0.02432251,0.021469116,0.022979736,0.03894043,-0.026138306,0.029144287,0.027709961,-0.0340271,-0.00037574768,-0.009483337,0.02519226,0.007003784,-0.0037002563,0.02444458,0.022766113,0.03250122,-0.054382324,-0.019943237,0.0017728806,0.02848816,-0.03378296,-0.036743164,-0.03894043,-0.018188477,0.020248413,0.0013933182,-0.007041931,0.03265381,-0.018127441,0.00094890594,0.011108398,0.017044067,-0.016540527,0.0010471344,-0.044281006,-0.016189575,0.0015058517,0.013572693,-0.01121521,0.0121536255,-0.018249512,-0.034606934,0.0030117035,-0.027877808,0.006450653,-0.0055351257,0.00019907951,0.034942627,-0.019607544,0.01612854,-0.029953003,-0.044036865,0.00034499168,0.026153564,0.023345947,-0.048553467,0.018188477,-0.012779236,0.0013189316,-0.00012874603,0.001660347,0.021911621,0.022460938,0.011054993,0.028671265,-0.0463562,0.037261963,-0.017471313,-0.012077332,-0.009361267,-0.015090942,-0.02331543,-0.019363403,0.00283432,0.054901123,-0.03074646,-0.018936157,-0.025390625,-0.0625,-0.014511108,-0.058441162,0.012680054,0.006324768,0.02722168,-0.027877808,0.016738892,0.0184021,0.011291504,-0.0076904297,-0.008491516,-0.006843567,0.025100708,0.028869629,0.009086609,-0.040252686,-0.02507019,-0.01524353,-0.004043579,-0.026306152,-0.036987305,-0.017822266,-0.019958496,-0.0053901672,-0.005554199,-0.012382507,-0.026153564,-0.003042221,-0.042175293,0.036895752,-0.01121521,-0.000030100346,0.0039100647,-0.039642334,0.001408577,0.016906738,-0.02053833,0.02331543,-0.009391785,-0.012161255,-0.027572632,0.0017204285,0.013069153,0.015419006,-0.01878357,-0.034820557,0.005695343,-0.021469116,-0.055511475,-0.00894928,-0.021316528,0.0074501038,-0.00070142746,-0.011131287,-0.05618286,0.0061302185,-0.017471313,0.004989624,0.008453369,0.014587402,0.007583618,-0.0028514862,0.018447876,-0.005466461,-0.027069092,-0.042266846,0.01158905,0.009651184,-0.017059326,0.043121338,0.034118652,-0.006248474,-0.014183044,0.010238647,-0.0062026978,0.00069856644,-0.014915466,0.013534546,-0.024002075,0.01676941,0.0060653687,-0.028518677,-0.031555176,-0.005882263,0.07196045,-0.0007753372,-0.0018930435,0.004322052,-0.020721436,0.014663696,0.037506104,-0.030090332,0.011177063,-0.016479492,0.022735596,-0.027526855,0.01878357,-0.00006812811,0.02859497,-0.020874023,-0.0552063,0.0007200241,-0.004398346,0.0039138794,-0.053222656,-0.03451538,-0.043060303,0.014282227,-0.025009155,0.002981186,-0.0008506775,0.0037345886,-0.018585205,-0.06112671,0.0030651093,0.054138184,0.0031337738,0.021316528,-0.026184082,0.012863159,0.026367188,-0.010971069,-0.004863739,0.01751709,-0.04031372,-0.0051879883,-0.027328491,0.038238525,-0.00083112717,-0.025115967,0.015357971,0.001490593,0.03414917,-0.023834229,0.017181396,-0.023208618,-0.025466919,-0.006214142,0.00033211708,-0.0143585205,0.003824234,0.026367188,-0.024642944,0.028060913,-0.018096924,0.0075035095,-0.0036144257,0.017578125,0.03894043,-0.027297974,-0.00021648407,0.004486084,0.0012483597,0.037139893,-0.03265381,0.03994751,0.0118255615,-0.014862061,0.009017944,-0.017623901,-0.032714844,-0.041046143,-0.023040771,0.022720337,0.01663208,-0.00018572807,-0.006652832,0.010116577,-0.0030555725,0.014602661,0.009925842,-0.0021972656,-0.020568848,-0.02935791,0.008766174,0.01399231,0.019104004,0.01751709,0.01626587,0.035583496,0.04837036,-0.013954163,-0.025543213,-0.007686615,0.031219482,0.002357483,-0.0050315857,0.026763916,0.014434814,0.0064964294,0.017669678,0.012664795,-0.030792236,-0.025238037,-0.0062408447,-0.030090332,0.0028877258,0.0037231445,0.018585205,0.005367279,0.0076026917,-0.007835388,-0.021392822,-0.002702713,-0.03262329,-0.015396118,0.0027122498,0.010383606,0.020004272,0.010604858,-0.0010442734,0.027023315,0.0024814606,0.021652222,0.00548172,-0.016845703,0.030975342,0.034240723,-0.008476257,-0.025726318,-0.01625061,-0.0069885254,-0.008575439,-0.008720398,-0.01171875,0.013664246,0.03152466,-0.017303467,0.02444458,0.013069153,0.02229309,-0.009605408,0.009056091,-0.006263733,0.019226074,0.0023288727,0.025726318,-0.059265137,0.029327393,0.021484375,0.0063819885,-0.008155823,-0.0012359619,-0.021026611,0.016616821,0.019989014,0.0013885498,0.03289795,-0.021102905,0.028457642,-0.01751709,-0.018630981,0.014602661,-0.02079773,-0.042053223,0.015838623,-0.005256653,-0.010124207,0.011161804,-0.02053833,0.03704834,-0.021148682,0.007129669,0.00258255,-0.0098724365,-0.015090942,-0.029067993,0.019943237,-0.035064697,-0.029205322,-0.0026721954,-0.013092041,0.05078125,0.04248047,0.014457703,0.032196045,0.005683899,-0.01133728,-0.048980713,-0.051727295,0.022247314,-0.02381897,0.030975342,-0.013412476,0.054229736,0.042510986,0.019165039,0.03149414,0.03074646,0.035827637,-0.010154724,0.007648468,-0.02633667,0.022460938,-0.0345459,0.007987976,0.000026583672,0.040527344,-0.032073975,0.009765625,-0.0005736351,0.021911621,-0.013519287,0.020889282,0.06921387,0.016494751,-0.0052375793,0.03817749,-0.0034542084,-0.026947021,-0.0039901733,-0.013748169,0.051513672,0.005142212,0.04296875,0.038848877,0.009292603,0.0011816025,0.028457642,-0.024917603,-0.012031555,0.024963379,0.025375366,-0.0143966675,-0.007205963,-0.0067367554,0.007408142,-0.061340332,-0.022964478,0.01914978,0.0026836395,0.016555786,-0.012924194,-0.0096588135,-0.0030918121,0.02909851,0.009841919,0.017532349,0.00032043457,0.009437561,0.026260376,-0.008232117,0.04650879,-0.00082206726,0.008964539,-0.020263672,-0.038085938,0.012329102,-0.0027828217,-0.0008111,-0.009567261,0.030517578,0.019821167,0.037322998,0.02357483,-0.021118164,0.0031528473,0.027877808,0.015411377,0.017745972,0.046142578,0.023208618,0.00894165,0.02949524,0.02935791,0.016693115,-0.0007367134,0.018569946,0.002336502,-0.009597778,0.006652832,-0.0024318695,0.0047798157,-0.0069503784,0.007724762,-0.017990112,-0.0029716492,0.022521973,0.023345947,-0.0018901825,0.0062713623,0.014450073,0.011978149,0.0005764961,0.009284973,0.011695862,-0.012893677,0.041625977,0.020935059,0.0357666,-0.002670288,0.030792236,-0.0027713776,-0.014053345,-0.019821167,0.015197754,-0.045013428,0.008056641,-0.004501343,-0.014083862,-0.03152466,0.017669678,0.010513306,-0.017333984,0.03074646,0.011177063,-0.017456055,0.00014674664,0.03491211,0.030593872,-0.010734558,0.011428833,-0.02444458,0.022277832,0.0657959,0.015625,-0.015090942,-0.04421997,0.0070228577,0.015548706,-0.002708435,-0.0073013306,0.0015735626,-0.0046691895,-0.04232788,0.02848816,0.030899048,0.008285522,0.039764404,-0.011367798,-0.024795532,0.0040626526,0.022109985,0.005180359,-0.0060043335,-0.019302368,0.013145447,-0.020355225,0.04840088,0.04046631,0.014701843,0.02331543,0.0028133392,-0.010368347,0.0023384094,-0.011398315,0.011070251,-0.019515991,-0.0016155243,-0.0127334595,0.033843994,-0.012611389,-0.015838623,-0.004360199,-0.029907227,-0.036315918,-0.018707275,0.022445679,0.017745972,0.027252197,0.038330078,0.023452759,-0.028305054,0.059417725,-0.027862549,0.0362854,-0.0064888,-0.0050315857,0.0690918,0.028839111,0.04055786,0.0012540817,0.019973755,-0.026794434,-0.0017232895,0.025131226,0.020980835,0.020126343,-0.00434494,-0.029251099,0.039489746,-0.005584717,0.011962891,-0.02368164,-0.00566864,0.013320923,-0.006187439,-0.028671265,-0.00308609,-0.004421234,0.0060920715,0.044158936,-0.030181885,-0.028411865,-0.023712158,-0.01361084,0.030517578,-0.015777588,-0.008964539,0.0021591187,-0.022735596,0.006462097,-0.0020103455,-0.0143966675,0.009002686,0.032226562,-0.03289795,0.0025939941,-0.0012769699,0.028305054,-0.02659607,0.036895752,0.03237915,0.0036087036,0.004611969,0.043151855,-0.006881714,0.03353882,-0.025650024,0.03250122,0.045776367,0.0027065277,-0.006969452,0.020324707,0.019485474,-0.015960693,0.017120361,0.03024292,0.01108551,0.015960693,0.008110046,0.0069007874,0.0013942719,0.020492554,-0.022628784,0.006832123,-0.011734009,-0.024856567,0.01184082,0.014839172,-0.00029706955,0.0052986145,-0.0067367554,0.00077295303,0.009559631,0.040924072,0.024902344,-0.0395813,-0.004085541,0.0031585693,-0.0028839111,-0.01965332,-0.018341064,0.012229919,-0.05291748,0.015274048,0.029327393,0.0045318604,0.0088272095,-0.018417358,-0.0024757385,0.032226562,0.028945923,0.014297485,0.009544373,0.0051078796,0.016967773,-0.0046310425,-0.0027046204,-0.016586304,-0.018554688,0.0040283203,0.029800415,-0.01626587,-0.026489258,0.0109939575,-0.003446579,0.0029335022,-0.00070238113,0.003358841,0.0262146,0.0024108887,0.005554199,-0.009880066,0.011779785,-0.021743774,-0.024963379,-0.030258179,0.0039711,0.06072998,-0.021316528,-0.013893127,0.010345459,0.03390503,0.016174316,0.026641846,-0.0051116943,0.04586792,0.015045166,-0.00078105927,-0.045776367,-0.0009975433,-0.020996094,-0.017440796,0.022277832,-0.040222168,-0.026306152,0.008613586,0.013916016,-0.012428284,-0.024536133,-0.0023670197,-0.018066406,-0.036254883,0.031829834,-0.0048828125,0.0019798279,-0.033721924,0.0017757416,0.0138549805,-0.02142334,-0.03552246,-0.0006942749,-0.002565384,-0.01638794,-0.06793213,0.021240234,-0.028945923,0.010437012,-0.0126571655,0.014854431,-0.0055351257,0.031021118,-0.0038108826,0.00111866,0.010986328,0.018753052,0.021530151,-0.005596161,0.03640747,-0.03866577,-0.040252686,-0.009895325,-0.0015039444,-0.013168335,0.031921387,-0.006046295,0.019332886,0.0007452965,-0.008728027,0.0031852722,-0.003484726,-0.018539429,-0.011306763,-0.028335571,-0.031433105,0.007671356,0.021575928,-0.012519836,0.011810303,0.040924072,-0.008613586,-0.02607727,0.017196655,0.0317688,0.007091522,0.03302002,0.0018348694,-0.005672455,-0.025512695,-0.0060195923,-0.026901245,0.015449524,-0.00002092123,0.0025787354,-0.015197754,0.026535034,0.011909485,-0.008407593,0.014167786,0.014785767,0.01965332,-0.012107849,0.036071777,0.0085372925,0.0007047653,-0.013450623,-0.00548172,0.0067977905,0.03805542,0.015548706,0.02192688,-0.004814148,-0.0003118515,-0.008796692,-0.002483368,0.0022449493,-0.024765015,-0.035186768,-0.016479492,-0.03503418,-0.007411957,-0.0020618439,0.007873535,-0.008377075,0.025634766,-0.0027866364,-0.033843994,-0.0073432922,0.023345947,0.0071868896,-0.00806427,0.013153076,0.0124435425,-0.015731812,-0.03164673,0.008720398,-0.07397461,-0.041381836,-0.010513306,-0.008399963,0.017364502,0.0007638931,-0.012519836,0.010154724,-0.00932312,-0.010314941,-0.0053901672,0.025390625,-0.015609741,0.0030899048,0.009780884,0.025039673,-0.010108948,0.009674072,-0.028335571,-0.0029754639,0.014862061,-0.014221191,0.028289795,-0.0022335052,0.023880005,0.0053367615,-0.015045166,0.013595581,-0.014526367,0.0025024414,-0.04360962,0.004047394,0.0077056885,-0.020248413,0.008476257,-0.013725281,-0.032073975,-0.011734009,-0.010734558,-0.026672363,0.023284912,0.030258179,0.031982422,0.0054779053,0.04562378,-0.033447266,-0.013130188,-0.0023097992,0.005756378,-0.03579712,-0.0048446655,0.014450073,-0.007762909,-0.012779236,-0.016555786,0.00217247,-0.029144287,-0.03036499,-0.0011854172,-0.016708374,-0.010757446,0.019195557,0.025100708,0.034301758,0.010635376,0.017166138,0.02243042,0.01222229,0.023620605,-0.011009216,0.053222656,-0.0008029938,-0.03149414,-0.008636475,0.009300232,-0.009292603,-0.018066406,-0.010696411,-0.009315491,-0.04309082,0.009880066,-0.011550903,0.03353882,-0.010215759,0.024398804,-0.019012451,-0.009002686,-0.031311035,-0.004562378,-0.04147339,0.006416321,0.040893555,0.017440796,0.0051498413,-0.017074585,-0.037139893,0.026306152,0.013305664,0.0085372925,-0.053833008,-0.028015137,0.00091552734,0.0005249977,0.008392334,0.011253357,-0.031921387,-0.0059318542,0.004676819,0.004585266,-0.0073394775,-0.009674072,0.007545471,-0.0021533966,-0.005458832,0.0064811707,0.036499023,0.0025634766,-0.013458252,-0.018188477,-0.0044174194,0.034606934,0.03475952,-0.014526367,0.025741577,0.027526855,-0.03817749,0.055358887,-0.030548096,0.0079422,-0.010261536,0.007926941,-0.031402588,-0.016677856,0.0012645721,-0.012466431],"createdAt":"2026-04-21T18:32:12.355Z","updatedAt":"2026-04-22T07:32:10.975Z","lastSeenAt":"2026-04-22T07:32:10.975Z","tsv":"'/api/v1/emails/53':47,190 '0.02':10,24,76,126 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '20':120 '402':202 '6':131 'Base network API' 'USDC API' 'accept':89 'access':39 'actual':192 'address':138 'advertis':150 'ai/ml':66 'amount':117 'analyt':65 'api':38,143,161 'avail':216 'base':8,22,85,122,141 'behind':208 'broader':53 'call':61 'caller':102 'challeng':203 'confirm':197 'connect':169 'content':175 'crypto':69 'data':5,19,64 'decim':132 'descript':186 'doc':159 'document':154 'dozen':56 'email':4,18,43,211 'email API' 'email-data' 'email-rel':42 'endpoint':6,20,30,62,88,195,212 'exact':206 'exampl':183 'extrem':156 'financ':68 'function':207 'gate':3,17,37 'handl':97 'header':109 'includ':104 'infer':67 'json':94 'json-response' 'key':144 'limit':153 'live':198 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':217 'maximum':116 'micropayment API' 'must':103 'need':146 'network':86 'no-api-key' 'offer':55 'openapi':179 'page':164 'paid email endpoint' 'part':50 'pay':9,23,59 'pay-per-cal':58 'pay-per-request' 'payment':95,108,113,134 'per':11,25,60,77 'platform':54,149 'post':90 'price':74,160 'prompt':171 'proof':114 'proper':201 'protocol':36,101 'provid':33 'rate':152 'readm':163 'relat':44 'render':166 'request':12,26,78,91 'request/response':182 'requir':118 'resourc':45,191 'return':93,193,199 'schema':180 'sent':136 'servic':72 'settl':80 'sinc':128 'span':63 'spars':157 'specif':46,210 'substant':174 'unclear':214 'unit':123 'usd':127 'usdc':14,28,82,125,129 'usdc-base' 'use':130 'util':71 'valid':112 'via':98 'wallet':170 'x':107 'x-payment':106 'x402':2,16,35,100 'x402 email' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':34","prices":[{"id":"33cab4d7-01b4-4a4c-b196-49e2495ed360","listingId":"3aeac980-c595-4b3c-a3fe-c8b35926ef77","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.355Z"}],"sources":[{"listingId":"3aeac980-c595-4b3c-a3fe-c8b35926ef77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.355Z","lastSeenAt":"2026-04-22T07:32:10.975Z"}],"details":{"listingId":"3aeac980-c595-4b3c-a3fe-c8b35926ef77","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/53 \\\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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/53"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/53"}],"useCases":["Retrieving email-related data behind a per-call paywall","Agent-driven data access without API key management","Programmatic pay-per-use email lookups"],"bestFor":["AI agents that can settle x402 payments on Base","Developers wanting keyless, pay-per-call API access","Low-volume consumers who prefer no subscription commitments"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume batch email processing where per-call pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.882Z"},"updatedAt":"2026-04-22T07:32:10.975Z"}}