{"id":"1b64e844-ba28-4bc7-a880-bb06416dfd3b","shortId":"RjjbNH","kind":"x402","title":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 22) behind an x402 paywall. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json responses.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per call. The platform emphasizes no API keys, no rate limits, and instant access via the x402 protocol.\n\nHowever, the specific endpoint being listed (`/api/v1/emails/22/attachments`) is not mentioned on the site's landing page among the advertised API categories. Its purpose — retrieving attachments for a specific email — is unclear in context. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no documentation describing what this endpoint actually returns or what input it expects beyond a POST request.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-endpoint"],"categories":["storage","email"],"synonyms":["email attachment API","x402 email endpoint","paid email access","Base USDC micropayment","lowpaymentfee email"],"warnings":["This specific endpoint (/api/v1/emails/22/attachments) is not listed among the provider's advertised APIs on the landing page — its purpose and data source are unclear.","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content.","No OpenAPI schema, request body schema, or response examples are available.","The endpoint references a hardcoded email ID (22); it is unclear whether other email IDs are accessible or what data is being served."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/22/attachments","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/22/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 with a valid x402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint (/api/v1/emails/22/attachments) is not listed among the site's advertised APIs. The docs, pricing, and README pages are empty. 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":"2026-04-21T19:03:05.635Z","embedding":[-0.03869629,0.00061035156,0.048706055,0.022155762,-0.006252289,-0.04437256,-0.041900635,0.043914795,0.05999756,-0.06524658,0.018005371,-0.039916992,-0.018432617,-0.032104492,-0.032440186,-0.006652832,0.018859863,-0.044891357,-0.041931152,0.030944824,0.04888916,-0.0064353943,-0.039093018,0.0020313263,-0.01739502,-0.010375977,-0.006038666,0.007381439,-0.0032367706,-0.042297363,0.023162842,-0.022888184,-0.023895264,0.013908386,-0.023345947,0.046325684,-0.007472992,0.030303955,0.019729614,0.011199951,0.010673523,-0.025772095,0.0022964478,0.00019431114,-0.031051636,-0.002204895,0.017868042,-0.032196045,0.0082473755,-0.011917114,-0.0107803345,0.0041046143,0.0052261353,0.0069274902,0.021392822,0.028549194,0.016662598,0.0009531975,-0.02470398,0.030914307,-0.017166138,-0.06085205,-0.025497437,0.00052404404,0.0038490295,0.046875,-0.021514893,0.040649414,0.0079956055,0.078552246,0.035247803,0.051757812,0.055633545,0.013931274,0.01739502,-0.01902771,-0.011512756,0.016235352,-0.04827881,-0.03302002,0.0017080307,-0.01423645,-0.04711914,0.00843811,-0.05166626,-0.048217773,-0.008758545,0.025527954,-0.035614014,0.031341553,-0.103149414,0.013572693,0.0029411316,-0.008049011,0.008239746,-0.009147644,-0.019592285,0.0048828125,-0.0072784424,0.011138916,0.0064315796,-0.043701172,-0.0026721954,-0.023498535,0.04220581,0.012077332,0.01436615,0.011688232,0.017684937,0.0064926147,-0.017242432,-0.0035820007,-0.010734558,0.0062561035,0.027297974,-0.0030097961,-0.03366089,0.035003662,-0.024719238,0.016235352,-0.034484863,0.056243896,0.014045715,0.0066833496,0.010986328,-0.029022217,-0.0128479,0.02709961,-0.036956787,-0.0029182434,0.08319092,0.027786255,0.04095459,-0.049468994,-0.02709961,0.010734558,0.0047912598,-0.013870239,-0.053466797,-0.018325806,0.050933838,-0.032409668,0.016235352,-0.005405426,-0.1048584,0.01398468,-0.036315918,0.008613586,-0.0010824203,-0.008796692,0.014816284,-0.009811401,-0.005455017,-0.005809784,-0.024047852,-0.030197144,0.0021476746,0.016647339,-0.00932312,0.026611328,-0.01626587,0.00002604723,0.02571106,-0.0026130676,0.008590698,0.03189087,0.01322937,-0.072509766,-0.062286377,-0.024841309,-0.0033550262,-0.007144928,-0.033172607,0.016174316,-0.0037078857,-0.05609131,0.01159668,-0.017166138,0.002040863,-0.042938232,0.001958847,-0.044677734,0.007671356,-0.011245728,-0.0519104,-0.011978149,-0.0062408447,0.066345215,0.0017766953,0.027816772,0.03778076,-0.014457703,0.046081543,0.024719238,-0.0234375,-0.01638794,0.006526947,-0.0063323975,0.035064697,0.0052337646,-0.014640808,-0.020507812,0.04067993,0.05026245,-0.0119018555,0.0018310547,0.0029888153,-0.017944336,-0.012809753,-0.026260376,0.019927979,0.00258255,-0.012542725,0.035980225,-0.032226562,-0.029281616,0.0060653687,0.027267456,0.008094788,0.048950195,-0.008125305,0.014122009,0.026428223,0.03451538,-0.03086853,0.034729004,0.012275696,0.0031032562,-0.009262085,-0.025985718,0.023834229,0.0395813,-0.016937256,0.012161255,-0.013175964,0.023513794,-0.0041770935,-0.014961243,0.018554688,-0.004863739,-0.014778137,-0.029434204,0.0025100708,0.026428223,-0.011894226,-0.04196167,-0.03955078,-0.042785645,0.07006836,0.022827148,0.02986145,0.009399414,-0.011482239,-0.01864624,-0.013648987,-0.059173584,0.024841309,0.07293701,0.006713867,-0.01663208,0.0440979,0.0015583038,-0.045715332,0.010574341,0.008399963,-0.019592285,-0.024291992,0.008552551,-0.058135986,0.027114868,0.0025043488,0.05630493,0.056915283,-0.0064582825,-0.036315918,0.0013284683,-0.03640747,-0.031051636,-0.015419006,0.00856781,-0.004055023,-0.006263733,0.011024475,-0.01675415,0.025268555,0.007701874,0.023117065,-0.0012741089,0.017669678,-0.033813477,-0.021881104,-0.013420105,0.019332886,-0.049987793,-0.0041770935,-0.0022697449,0.06585693,-0.05218506,0.035827637,-0.024505615,-0.0041618347,0.049102783,0.007820129,-0.051330566,-0.0011959076,0.0071258545,0.019760132,0.062683105,0.00034284592,0.0024261475,-0.016784668,0.025466919,-0.05368042,-0.0026836395,0.015174866,0.018997192,0.019836426,0.02684021,-0.028045654,-0.021011353,-0.008506775,-0.015319824,0.030456543,-0.040039062,0.05227661,0.00018715858,-0.009124756,-0.02822876,-0.027404785,-0.0129470825,0.0020275116,-0.035186768,0.0069084167,-0.041900635,-0.02078247,0.028167725,0.012306213,0.016693115,-0.0012559891,0.0501709,-0.004676819,-0.0063209534,-0.018325806,-0.005241394,-0.052459717,-0.037200928,0.005870819,-0.00023114681,0.011314392,0.02041626,-0.029251099,0.002840042,0.037384033,0.019577026,0.0065612793,0.013633728,0.0020179749,-0.086242676,-0.018585205,-0.022628784,-0.02658081,0.009521484,0.014945984,0.008605957,0.06677246,-0.0036716461,-0.023620605,-0.06524658,0.024780273,-0.04824829,0.012901306,0.035186768,-0.021621704,-0.021469116,-0.016967773,-0.008720398,0.0003554821,0.046783447,0.011238098,0.033081055,0.061584473,0.047332764,-0.012863159,-0.008934021,0.032684326,-0.003112793,-0.022903442,-0.01789856,-0.036010742,-0.011619568,0.018051147,-0.0016536713,-0.021743774,-0.05404663,0.032226562,0.06781006,0.07409668,0.017059326,0.021209717,-0.01586914,-0.037597656,0.011314392,-0.032318115,-0.014518738,-0.0119018555,-0.042053223,0.021316528,-0.016052246,0.018447876,-0.038726807,0.0008997917,-0.0010719299,0.0046691895,-0.0101623535,0.05480957,-0.0042495728,0.0025253296,0.030654907,0.026138306,0.030761719,0.02557373,-0.030426025,0.03439331,0.050994873,-0.018798828,-0.0143585205,0.040283203,-0.016036987,0.00919342,-0.05419922,-0.050750732,-0.011985779,-0.050964355,-0.074157715,-0.0033569336,-0.017593384,0.04888916,0.046875,-0.027938843,-0.04525757,0.01234436,-0.016296387,-0.062286377,0.004962921,-0.044555664,0.02355957,0.013557434,-0.012359619,0.022415161,0.014343262,-0.014305115,-0.007293701,0.034179688,-0.014961243,0.02420044,-0.03262329,0.0036907196,-0.024627686,0.018798828,0.0064315796,0.027420044,0.014907837,0.028579712,0.021377563,0.0025424957,-0.033203125,-0.06829834,0.01638794,-0.047210693,0.026992798,0.034698486,-0.013710022,0.0035572052,0.0059318542,-0.017196655,-0.032836914,0.032440186,-0.052368164,-0.016326904,-0.0007247925,-0.036834717,-0.020950317,-0.052246094,-0.051635742,-0.04269409,0.07196045,0.028152466,0.018127441,-0.017440796,-0.025894165,0.009597778,0.0022888184,0.031829834,-0.014060974,-0.02822876,-0.01864624,-0.012023926,-0.051513672,-0.01574707,0.0345459,-0.026123047,-0.012832642,0.01977539,0.0062446594,0.035614014,0.0047302246,-0.012870789,0.009857178,-0.010658264,-0.0048980713,0.01826477,0.03237915,0.020828247,-0.010810852,-0.03186035,0.030685425,0.00026345253,0.046783447,-0.010498047,-0.031921387,-0.022857666,0.022262573,0.008781433,-0.013793945,-0.009269714,0.014678955,-0.04928589,-0.046783447,0.010528564,-0.01727295,0.039276123,0.02507019,0.014640808,0.022872925,-0.020309448,0.020599365,0.007183075,-0.03692627,-0.02279663,-0.007659912,-0.024490356,-0.006137848,0.011528015,-0.009140015,0.014404297,-0.018295288,0.008354187,0.0154418945,-0.0014333725,0.03387451,-0.009498596,0.023468018,0.030014038,0.0038871765,0.0039100647,0.025619507,0.020507812,-0.04550171,0.023956299,-0.007522583,0.015060425,-0.014480591,0.041992188,0.04623413,-0.017715454,0.009223938,-0.008682251,-0.013832092,-0.0067481995,-0.0063476562,0.017745972,0.015213013,-0.013328552,-0.038085938,0.028656006,0.027114868,-0.03201294,-0.027023315,0.007621765,0.0020446777,-0.032989502,0.023529053,0.00060510635,0.041809082,-0.008049011,-0.007118225,0.009727478,0.029937744,0.03326416,-0.0071372986,0.017089844,0.007965088,-0.0019779205,-0.008666992,0.018005371,0.006248474,0.022750854,0.003124237,0.016860962,0.0031757355,0.0035438538,-0.009239197,-0.03265381,-0.012390137,0.027114868,-0.011039734,0.030166626,0.004184723,0.044036865,-0.018005371,0.027740479,0.03842163,-0.03845215,-0.00056505203,0.0020389557,0.04937744,0.0067863464,-0.016143799,0.016036987,0.012199402,0.025375366,-0.06762695,0.0045204163,0.0041160583,0.035705566,-0.023773193,-0.04345703,-0.056488037,-0.011817932,0.029556274,0.013511658,0.020431519,0.033172607,-0.021621704,0.0039482117,0.0018100739,0.005027771,-0.0039253235,-0.005256653,-0.029373169,-0.023666382,-0.005104065,0.026626587,-0.025039673,0.008972168,0.008773804,-0.03274536,0.0074272156,-0.032073975,0.00945282,-0.010284424,-0.00032019615,0.04071045,-0.0087890625,0.021347046,-0.022491455,-0.028884888,0.014663696,0.0053253174,0.029663086,-0.0413208,0.009284973,-0.0027561188,0.0038719177,-0.009757996,-0.004310608,0.012619019,0.0104904175,-0.00088739395,0.026321411,-0.070373535,0.025543213,-0.01751709,-0.005012512,0.0027446747,-0.032684326,-0.007144928,-0.019424438,0.008056641,0.03955078,-0.0033283234,-0.031311035,-0.03277588,-0.0619812,-0.014968872,-0.041656494,0.011047363,0.021621704,0.024032593,-0.027374268,0.0146484375,0.004497528,0.0044288635,0.0012311935,0.0033607483,0.011642456,0.047302246,0.029663086,0.025299072,-0.024917603,-0.03302002,-0.0056152344,-0.003572464,-0.0028533936,-0.019699097,-0.016067505,0.0037784576,0.025161743,0.00043940544,-0.0368042,-0.016143799,-0.0069007874,-0.021072388,0.030090332,-0.0072402954,0.011978149,-0.008842468,-0.03829956,0.013969421,0.013343811,-0.009750366,0.013420105,0.0065345764,-0.008712769,-0.04586792,-0.0021076202,0.020523071,0.005634308,0.019927979,-0.047058105,-0.00894928,-0.027557373,-0.039520264,-0.0016307831,-0.01626587,0.0007529259,-0.021881104,0.0013341904,-0.05819702,0.013969421,0.0104904175,0.0012111664,0.042938232,0.02041626,0.024841309,-0.007549286,0.0007534027,-0.012306213,-0.019927979,-0.035705566,0.0151901245,0.0102005005,-0.0031490326,0.042633057,0.039916992,0.0085372925,-0.026763916,0.0037002563,-0.013648987,0.006954193,-0.009147644,0.03253174,-0.010635376,-0.0017747879,-0.0014390945,-0.013908386,-0.029678345,-0.00072050095,0.07537842,-0.0023670197,0.019683838,0.0070762634,-0.008659363,0.016952515,0.008773804,-0.026657104,0.0011720657,-0.02142334,-0.001666069,-0.009529114,0.022506714,-0.009513855,0.014549255,-0.033935547,-0.051452637,-0.008758545,-0.024276733,-0.017654419,-0.072387695,-0.014816284,-0.045959473,0.0022678375,-0.010795593,-0.038269043,0.016342163,0.009521484,-0.01197052,-0.06896973,0.008483887,0.0413208,-0.0143966675,0.024230957,0.0023174286,0.025939941,0.022918701,-0.0036373138,-0.008071899,0.019134521,-0.048736572,-0.013549805,-0.032409668,0.039398193,0.005996704,-0.016036987,0.035125732,-0.0010852814,0.012825012,-0.030044556,0.022109985,-0.0023727417,-0.0011777878,-0.022613525,-0.008506775,-0.01638794,0.017837524,0.058563232,-0.037322998,0.02583313,-0.009391785,-0.013725281,0.01234436,0.028625488,0.049438477,-0.030319214,0.020309448,0.0059890747,0.008659363,0.038146973,-0.033081055,0.033569336,0.027938843,-0.010978699,0.015853882,0.01398468,-0.029525757,-0.025985718,-0.015342712,0.031799316,-0.005466461,0.008590698,-0.0077934265,0.006832123,-0.037139893,0.016464233,0.00907135,0.012016296,-0.015602112,-0.033843994,-0.024459839,0.013954163,0.009124756,-0.015434265,0.02130127,0.021636963,0.037200928,-0.027038574,-0.015434265,-0.002401352,0.020080566,0.018478394,-0.011627197,0.028320312,0.008117676,0.009315491,0.018341064,0.008972168,-0.032958984,-0.016525269,-0.026275635,-0.005130768,-0.0011339188,-0.027679443,0.014533997,0.005695343,-0.004600525,-0.006690979,-0.012306213,0.008995056,-0.02293396,-0.018615723,-0.02432251,-0.012992859,0.028427124,-0.004096985,0.0029563904,0.04550171,0.0009174347,0.052490234,0.008979797,-0.020843506,0.025222778,0.0340271,0.009567261,-0.034606934,-0.012084961,0.0024604797,0.0026054382,0.011787415,-0.018875122,0.0035533905,0.036376953,-0.01159668,-0.00071811676,0.0013494492,0.02243042,-0.014778137,0.003730774,-0.010818481,0.0368042,0.007659912,0.015945435,-0.046081543,0.029190063,0.008049011,-0.015823364,0.0118637085,-0.020996094,-0.017745972,0.035736084,0.016464233,-0.012542725,0.032440186,-0.0074386597,0.0463562,-0.016311646,-0.036834717,0.03189087,-0.007255554,-0.032165527,0.02545166,0.007003784,0.0017442703,0.00932312,-0.034942627,0.04260254,-0.0178833,-0.015075684,-0.0104522705,-0.0047569275,-0.02809143,-0.021896362,0.004840851,-0.014137268,-0.022628784,-0.012054443,-0.0032367706,0.050476074,0.01878357,0.023483276,0.018615723,0.025787354,0.001906395,-0.0284729,-0.052764893,-0.0006933212,-0.0047683716,0.020858765,-0.0068893433,0.041809082,0.06591797,0.007736206,0.015808105,0.019927979,0.03375244,0.0009250641,0.02255249,-0.035003662,0.0184021,-0.011474609,-0.016159058,0.007785797,0.046875,-0.009811401,0.0075950623,-0.009162903,0.033966064,-0.031585693,0.03237915,0.06323242,-0.00024557114,0.0009813309,0.0119018555,-0.007762909,-0.06060791,0.005264282,-0.027023315,0.056549072,0.009315491,0.044006348,0.06286621,0.01676941,-0.0067863464,0.014595032,-0.017288208,-0.013626099,0.038360596,0.020309448,-0.011177063,-0.0014820099,-0.02609253,0.008270264,-0.034210205,-0.022232056,0.0025730133,0.005794525,0.0014038086,0.001490593,-0.002614975,0.0030269623,0.032196045,0.015281677,-0.012237549,0.01576233,0.025802612,0.021011353,0.010276794,0.031280518,-0.016708374,0.024108887,-0.032196045,-0.027893066,-0.008346558,-0.005466461,-0.006313324,-0.038726807,0.033599854,-0.00014173985,0.040161133,0.0390625,-0.003282547,0.017440796,0.013954163,-0.006881714,0.01751709,0.047943115,0.012168884,-0.007663727,0.026855469,0.025115967,0.014122009,0.005306244,0.028152466,0.012138367,-0.012825012,-0.00484848,0.00008916855,0.019241333,0.0037403107,0.017181396,0.0035953522,-0.00932312,0.00944519,0.039215088,0.003200531,0.013839722,-0.00970459,0.015945435,-0.015083313,0.008773804,-0.0010089874,-0.017578125,0.04449463,0.016708374,0.047332764,-0.010749817,0.02355957,-0.00008749962,-0.02255249,-0.018539429,0.008132935,-0.040130615,0.007522583,0.010528564,-0.028656006,-0.04067993,0.019256592,0.0012016296,-0.009506226,0.045043945,0.030227661,-0.021530151,0.008056641,0.024276733,-0.000114262104,-0.004798889,0.0051460266,-0.01737976,0.010986328,0.03744507,0.020187378,-0.0010404587,-0.03955078,-0.007698059,0.0151901245,0.008972168,-0.022354126,0.007003784,-0.0030059814,-0.011100769,0.022567749,0.0059776306,0.017364502,0.025604248,-0.029220581,-0.002576828,0.017181396,0.016677856,0.013671875,-0.01663208,-0.016311646,0.022140503,-0.0058021545,0.025527954,0.032287598,0.0040130615,0.01713562,-0.0015392303,-0.001786232,-0.0031490326,-0.009567261,0.024475098,-0.02142334,0.0065689087,-0.019454956,0.02619934,-0.017028809,-0.015342712,-0.008392334,-0.007911682,-0.022003174,-0.0019464493,0.026947021,0.011039734,0.01979065,0.029678345,0.01651001,-0.026382446,0.060546875,-0.038146973,0.04421997,-0.025161743,0.011222839,0.06161499,0.050445557,0.03729248,-0.013145447,0.025848389,-0.036315918,0.0057754517,0.04748535,0.01486969,0.01725769,-0.015960693,-0.022918701,0.04244995,-0.00046944618,0.040985107,-0.036987305,0.007698059,0.008331299,-0.021469116,-0.021942139,-0.0060691833,0.002904892,0.010261536,0.024795532,-0.030426025,-0.010749817,-0.012771606,-0.018798828,0.010131836,-0.02670288,-0.013473511,-0.0018444061,-0.026351929,0.0012788773,-0.004760742,-0.0023269653,0.0151901245,0.023742676,-0.03894043,-0.01852417,-0.00048971176,0.023803711,-0.011245728,0.029968262,0.03540039,-0.0011997223,0.03579712,0.029510498,-0.00920105,0.0262146,-0.010978699,0.012016296,0.04043579,0.006816864,-0.009651184,0.025360107,0.0037326813,-0.023483276,0.016616821,0.05557251,0.0031356812,0.0077934265,0.0010652542,0.016952515,-0.001244545,0.000875473,-0.021713257,0.0029354095,-0.009094238,-0.029525757,0.008964539,0.03567505,-0.01663208,0.0007147789,-0.011169434,-0.020004272,-0.001124382,0.043395996,0.040130615,-0.0395813,-0.008911133,0.001329422,-0.022750854,-0.013366699,-0.009735107,-0.017745972,-0.03793335,0.021850586,0.039276123,0.008255005,0.0317688,-0.016433716,-0.014228821,0.022888184,0.012207031,0.0104522705,-0.0104599,-0.009963989,0.00094747543,-0.030273438,0.00881958,-0.022033691,-0.006515503,0.010749817,0.034362793,-0.0051498413,-0.040161133,0.016738892,-0.019180298,0.0020484924,-0.013511658,-0.00024819374,0.018798828,0.0046310425,0.00065755844,0.0034923553,-0.004562378,-0.016281128,-0.013572693,-0.015975952,-0.0019550323,0.044158936,0.0008378029,-0.0003373623,0.019119263,0.046905518,0.020385742,0.039215088,0.002861023,0.053100586,0.010871887,-0.008972168,-0.039215088,-0.0037593842,-0.027191162,-0.014663696,0.013801575,-0.043060303,-0.018508911,0.014724731,-0.0053253174,-0.014022827,-0.024520874,-0.00045895576,-0.012542725,-0.005001068,0.04534912,-0.010894775,0.0060768127,-0.014419556,0.013290405,0.022155762,-0.028457642,-0.05142212,-0.010246277,-0.009384155,-0.02017212,-0.06604004,0.018569946,-0.02607727,-0.0049057007,-0.014251709,0.0020122528,0.0045547485,0.017364502,-0.01524353,-0.008743286,-0.013969421,0.03253174,0.009391785,0.009361267,0.018081665,-0.03439331,-0.052520752,-0.025634766,-0.0151901245,-0.019454956,0.032196045,-0.0050582886,0.019577026,0.026473999,-0.02960205,-0.00843811,-0.010192871,-0.0015668869,-0.0070495605,-0.01146698,-0.038604736,0.008354187,0.043060303,-0.009216309,0.0061836243,0.039916992,-0.0113220215,-0.018249512,0.018554688,0.030166626,0.0066375732,0.008506775,0.009513855,-0.004058838,-0.014457703,-0.0044136047,-0.016662598,0.01826477,0.0031719208,0.0020008087,-0.013031006,0.019897461,0.014755249,0.0023403168,0.015022278,0.018188477,0.00014328957,-0.010002136,0.014442444,0.015777588,0.002073288,-0.009483337,-0.0019683838,0.004917145,0.060333252,0.027267456,0.0070114136,-0.004497528,0.0059509277,-0.025421143,0.005542755,0.017089844,-0.019699097,-0.029937744,-0.015487671,-0.024047852,-0.0041275024,-0.013145447,0.014556885,0.010192871,0.033569336,0.0104904175,-0.053100586,-0.012710571,0.046844482,0.007904053,-0.02130127,-0.006454468,0.008132935,0.009277344,-0.04019165,-0.006351471,-0.04309082,-0.031799316,-0.001868248,-0.004802704,0.015525818,-0.0015583038,-0.0129470825,0.002653122,0.012504578,-0.021972656,0.013671875,0.015991211,-0.024230957,-0.0037899017,0.005420685,0.026290894,-0.008331299,0.015342712,0.0012578964,0.0064430237,-0.01146698,-0.020339966,0.0262146,-0.012283325,0.0004146099,0.021606445,0.002281189,0.016235352,0.006465912,0.004966736,-0.03665161,-0.010688782,0.0064430237,-0.018829346,0.031280518,-0.014984131,-0.02204895,-0.01335144,-0.024978638,-0.04989624,0.014816284,0.026397705,0.013404846,-0.0059661865,0.035583496,-0.03881836,0.0069084167,-0.0154953,0.016784668,-0.025924683,-0.015022278,0.02798462,-0.014060974,0.0036716461,-0.01109314,0.00008022785,-0.028167725,-0.021347046,0.010368347,0.00415802,0.0057754517,0.012191772,0.026351929,0.034362793,0.0024204254,0.023132324,0.008094788,-0.0037708282,0.019073486,-0.0011472702,0.049865723,-0.036010742,-0.024337769,-0.0066452026,0.0035915375,-0.0024318695,-0.005252838,0.01272583,-0.020462036,-0.027145386,0.00573349,-0.005203247,0.027786255,-0.0028476715,0.019546509,-0.017120361,-0.006412506,-0.025482178,-0.0032043457,-0.028533936,0.01348114,0.031021118,0.021865845,-0.004009247,-0.027038574,-0.036865234,0.027420044,0.0037136078,0.009773254,-0.040527344,-0.036010742,0.004016876,-0.0076026917,0.0004169941,0.02218628,-0.03543091,-0.018707275,0.0025863647,-0.0010738373,-0.0026054382,0.007843018,0.019332886,-0.011909485,-0.011764526,0.0005645752,0.02017212,-0.013519287,-0.0043525696,-0.013305664,-0.014312744,0.035186768,0.008422852,-0.025772095,0.013702393,0.033294678,-0.03262329,0.047332764,-0.019454956,0.0029506683,-0.017654419,0.0052452087,-0.03717041,0.0017652512,0.017440796,0.0035095215],"createdAt":"2026-04-21T18:32:11.052Z","updatedAt":"2026-04-22T02:31:49.191Z","lastSeenAt":"2026-04-22T02:31:49.191Z","tsv":"'/api/v1/emails/22/attachments':138 '/docs':167 '/pricing':168 '/readme':169 '0.02':10,22,52,113 '000':56 '20':55 '22':37 '6':60 'Base USDC micropayment' 'accept':64 'access':30,127 'actual':195 'advertis':75,150 'ai/ml':86 'among':148 'analysi':89 'analyt':85 'api':82,120,151 'application/json':69 'attach':3,15,33,156 'base':8,20,49,57 'behind':38 'beyond':202 'broader':72 'call':115 'categori':152 'classif':91 'connect':173 'content':179 'context':164 'convers':108 'data':84 'decim':61 'describ':191 'document':165,190 'email':2,14,32,35,160 'email attachment API' 'email-attachments' 'embed':92 'emphas':118 'endpoint':26,63,135,194 'estim':102 'exampl':187 'exchang':97 'expect':201 'feed':96 'financ':93 'gas':101 'gate':81 'generat':109 'geocod':106 'howev':132 'id':36 'infer':87 'infrastructur':104 'input':199 'instant':126 'key':121 'land':146 'limit':124 'list':137 'lowpaymentfee email' 'lowpaymentfee.com':28,73 'mention':141 'micropay':6,18 'micropayment' 'network':50 'openapi':183 'page':147,166 'paid email access' 'payment':42 'paywal':41 'per':11,23,53,114 'platform':74,117 'post':65,204 'post-endpoint' 'price':95,111 'prompt':175 'protocol':131 'provid':29 'purpos':154 'quot':100 'rate':98,123 'request':12,24,54,66,205 'request/response':186 'respons':70 'retriev':1,13,155 'return':68,170,196 'schema':184 'sentiment':88 'settl':44 'site':144 'span':83 'specif':34,134,159 'substant':178 'suit':77 'summar':90 'token':99 'unclear':162 'unit':58 'usdc':46 'usdc-base' 'util':105 'valid':107 'via':4,16,128 'wallet':174 'web3':94 'x402':5,17,40,80,130 'x402 email endpoint' 'x402-gated':79 'x402-payment'","prices":[{"id":"7caf4462-c395-49e0-b3a5-f8ca59f75bc0","listingId":"1b64e844-ba28-4bc7-a880-bb06416dfd3b","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/22/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.052Z"}],"sources":[{"listingId":"1b64e844-ba28-4bc7-a880-bb06416dfd3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/22/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.052Z","lastSeenAt":"2026-04-22T02:31:49.191Z"}],"details":{"listingId":"1b64e844-ba28-4bc7-a880-bb06416dfd3b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/22/attachments \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/emails/22/attachments"},{"claim":"USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/22/attachments"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list an emails endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email attachments programmatically via micropayment","Agent-driven access to stored email data without API keys","Pay-per-request email attachment download"],"bestFor":["Agents needing on-demand email attachment retrieval without subscription","Developers experimenting with x402 micropayment protocols","Accessing email data without traditional authentication"],"notFor":["Bulk email processing or high-volume attachment downloads (no documented batch support)","Users needing detailed API documentation or schema guarantees","Production systems requiring SLA or uptime guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.432Z"},"updatedAt":"2026-04-22T02:31:49.191Z"}}