{"id":"2ad4d7af-1163-4376-9edf-b68da1403e28","shortId":"TFMbxX","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 39) 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 pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol on the Base L2 network.\n\nThe specific endpoint being listed here (/api/v1/emails/39/attachments) appears to serve attachment data for a particular email resource. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","pay-per-request","no-api-key"],"categories":["storage","email"],"synonyms":["email attachment API","x402 email endpoint","pay-per-call email","micropayment email access","Base USDC API","lowpaymentfee email"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The endpoint targets a hardcoded email ID (39) with no documented way to discover or access other emails","The platform lists many diverse API categories but provides no evidence any of them return real data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/39/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/39/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint path (/emails/39/attachments) is oddly specific with no explanation of what email 39 is or how to discover other resources. 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":"2026-04-21T19:20:51.645Z","embedding":[-0.04055786,0.0015916824,0.05126953,0.017837524,0.013214111,-0.06100464,-0.033996582,0.04699707,0.055114746,-0.06463623,0.012329102,-0.037719727,-0.024108887,-0.032287598,-0.038513184,-0.0022735596,0.032226562,-0.039093018,-0.031143188,0.029220581,0.0423584,-0.023544312,-0.03616333,0.00028276443,-0.01449585,-0.0038375854,-0.018035889,0.0018663406,-0.004627228,-0.048797607,0.02758789,-0.021987915,-0.014419556,0.01852417,-0.021606445,0.053253174,-0.020767212,0.033569336,0.015472412,0.0025730133,0.015045166,-0.022918701,0.016586304,0.007904053,-0.042388916,-0.009109497,0.02255249,-0.02973938,0.021194458,-0.0038032532,-0.00868988,0.008934021,0.007850647,0.002216339,0.01977539,0.036590576,0.017654419,-0.002149582,-0.021911621,0.029373169,-0.010055542,-0.06750488,-0.02029419,-0.006084442,0.0028533936,0.053497314,-0.026885986,0.04449463,0.0134887695,0.08050537,0.033813477,0.05319214,0.05807495,0.012359619,0.020767212,-0.027755737,-0.0037784576,0.014404297,-0.05215454,-0.027328491,-0.000058829784,-0.015182495,-0.038635254,0.004676819,-0.040740967,-0.04486084,-0.0023918152,0.03186035,-0.034301758,0.044677734,-0.09387207,0.002292633,-0.0042686462,-0.01512146,0.014595032,-0.000062704086,-0.023986816,-0.0018434525,-0.0074806213,0.0129470825,0.016082764,-0.023773193,0.013473511,-0.024230957,0.033813477,0.020858765,0.017242432,0.010322571,0.013877869,0.010643005,-0.02381897,0.0021533966,-0.0018196106,0.0031986237,0.03161621,0.003824234,-0.022415161,0.037506104,-0.029220581,0.020568848,-0.03302002,0.037994385,0.014656067,0.0009045601,0.01146698,-0.031951904,-0.010948181,0.023757935,-0.040222168,-0.010139465,0.07611084,0.028060913,0.049682617,-0.04840088,-0.017669678,0.015197754,0.016983032,-0.006828308,-0.05178833,-0.027786255,0.058685303,-0.035461426,0.00995636,-0.00028967857,-0.08959961,0.008659363,-0.05050659,0.0010356903,-0.0036640167,-0.004020691,0.011856079,-0.0104599,-0.0040283203,-0.00945282,-0.030014038,-0.029891968,0.0014390945,0.020614624,-0.012680054,0.026519775,-0.019363403,0.00077342987,0.027236938,-0.011169434,0.013122559,0.038208008,0.0041618347,-0.068237305,-0.070007324,-0.023269653,-0.00089645386,-0.010803223,-0.027877808,0.018310547,-0.006919861,-0.052459717,0.007881165,-0.0030765533,0.0000641942,-0.032409668,0.0024318695,-0.040283203,0.0031528473,-0.009010315,-0.051696777,-0.021133423,-0.00504303,0.06994629,-0.0032310486,0.019317627,0.0368042,-0.006336212,0.030349731,0.022216797,-0.015296936,-0.007713318,0.008903503,-0.006362915,0.025527954,0.009513855,-0.0124053955,-0.014167786,0.03677368,0.058166504,-0.011779785,0.0055389404,0.00059366226,-0.013893127,-0.012680054,-0.027160645,0.031204224,0.0050811768,-0.00024795532,0.029006958,-0.035003662,-0.030929565,0.010314941,0.022033691,0.01777649,0.052246094,-0.0056381226,0.008552551,0.03591919,0.035583496,-0.03488159,0.034576416,0.014717102,0.0032405853,-0.006412506,-0.030044556,0.02607727,0.028793335,-0.02267456,0.013877869,-0.016952515,0.027359009,-0.012748718,-0.0060157776,0.022750854,-0.015098572,-0.030471802,-0.030975342,0.00029945374,0.03024292,-0.011444092,-0.04196167,-0.040527344,-0.0496521,0.06109619,0.029006958,0.024795532,0.009155273,-0.012359619,-0.026351929,-0.0062065125,-0.053466797,0.023544312,0.06604004,0.011764526,-0.010353088,0.04324341,-0.005947113,-0.041656494,0.00045895576,0.010757446,-0.019256592,-0.0011968613,0.01335144,-0.05831909,0.028915405,-0.0034008026,0.050567627,0.058532715,-0.005344391,-0.045074463,0.0015497208,-0.025604248,-0.038513184,-0.014556885,-0.0016059875,-0.0071144104,-0.0044136047,0.013137817,-0.015808105,0.020370483,0.0019197464,0.009399414,0.0068626404,0.012763977,-0.028015137,-0.026107788,-0.014343262,0.02708435,-0.04815674,0.002166748,-0.005836487,0.047424316,-0.055480957,0.03543091,-0.03265381,-0.0040779114,0.053894043,0.017654419,-0.054473877,0.0036449432,0.007347107,0.017791748,0.05557251,-0.010536194,-0.00356102,-0.016571045,0.050109863,-0.03829956,0.0035820007,0.0075416565,0.022277832,0.020767212,0.019638062,-0.03765869,-0.025726318,-0.0015506744,-0.013832092,0.025238037,-0.03918457,0.045562744,0.0023651123,-0.0064048767,-0.03515625,-0.01878357,-0.0074424744,0.008628845,-0.02166748,0.0037517548,-0.04525757,-0.020477295,0.027664185,0.00793457,-0.010101318,-0.0031032562,0.05618286,-0.0076942444,-0.006011963,-0.029464722,-0.026382446,-0.04269409,-0.042266846,0.0045814514,-0.0029621124,0.012046814,0.020553589,-0.031433105,-0.0026130676,0.03112793,0.018981934,0.02027893,0.020202637,0.01272583,-0.10211182,-0.0127334595,-0.022323608,-0.03881836,0.0093688965,0.036499023,0.006095886,0.081970215,-0.006122589,-0.033599854,-0.061401367,0.030639648,-0.048431396,0.009887695,0.0491333,-0.016296387,-0.009391785,-0.012420654,-0.0047073364,0.0014839172,0.04711914,0.0074806213,0.03778076,0.06774902,0.054718018,-0.011413574,0.0008177757,0.024520874,-0.007827759,-0.028808594,-0.012199402,-0.028457642,-0.015625,0.021560669,-0.003929138,-0.017807007,-0.05923462,0.038238525,0.07348633,0.0713501,0.026626587,0.013366699,-0.0051612854,-0.026977539,0.007850647,-0.018325806,-0.02281189,-0.01965332,-0.038024902,0.022949219,-0.01600647,0.033325195,-0.039154053,-0.004749298,-0.0070152283,0.010047913,-0.00053596497,0.06414795,0.0022602081,-0.004501343,0.033111572,0.032409668,0.031921387,0.016616821,-0.020050049,0.04043579,0.048553467,-0.024368286,-0.0060539246,0.03668213,-0.009140015,0.012802124,-0.03286743,-0.050811768,-0.01838684,-0.05303955,-0.06414795,-0.0040245056,-0.020767212,0.043395996,0.06262207,-0.028533936,-0.045013428,0.0007967949,-0.014595032,-0.05126953,0.0058403015,-0.044952393,0.021652222,-0.00026750565,-0.013702393,0.015182495,0.008392334,-0.009178162,-0.013290405,0.035186768,-0.0042877197,0.015296936,-0.031463623,0.0041999817,-0.030548096,0.023880005,0.0007724762,0.02571106,0.02204895,0.040985107,0.015853882,-0.0034255981,-0.030395508,-0.06878662,0.018585205,-0.04196167,0.025650024,0.03982544,-0.0056037903,0.0057144165,0.011962891,-0.011169434,-0.03189087,0.02381897,-0.06384277,-0.017486572,-0.0035266876,-0.03857422,-0.025222778,-0.061401367,-0.052612305,-0.04650879,0.064331055,0.029067993,0.00630188,-0.016204834,-0.016342163,0.011734009,0.005077362,0.034484863,-0.013412476,-0.020889282,-0.008552551,-0.009681702,-0.043182373,-0.0065956116,0.034698486,-0.024276733,-0.016799927,0.024414062,0.0021877289,0.03189087,0.0015945435,-0.0011930466,0.016082764,-0.008560181,0.01134491,0.025665283,0.028366089,0.018753052,-0.012252808,-0.031219482,0.03488159,-0.0027122498,0.04360962,-0.015701294,-0.036132812,-0.016555786,0.016235352,0.013191223,-0.016220093,-0.009292603,-0.0033817291,-0.037017822,-0.055267334,0.011566162,-0.01751709,0.038269043,0.023529053,0.016830444,0.013114929,-0.026046753,0.018066406,0.008956909,-0.04208374,-0.027435303,-0.014968872,-0.024887085,-0.0044822693,0.008964539,-0.015563965,0.015914917,-0.014328003,0.009651184,0.0085372925,-0.009780884,0.024215698,-0.012573242,0.014717102,0.02130127,-0.0039711,-0.0039405823,0.028411865,0.018432617,-0.040924072,0.030853271,-0.009216309,0.019836426,-0.017745972,0.040740967,0.05053711,-0.013153076,0.0051460266,-0.0016374588,-0.017288208,-0.020004272,0.0019454956,0.018463135,0.012908936,-0.016555786,-0.0463562,0.01525116,0.026931763,-0.034301758,-0.023880005,0.002702713,-0.00008779764,-0.034576416,0.016860962,0.0065078735,0.027557373,-0.0050811768,-0.0020217896,0.0007829666,0.035369873,0.033477783,-0.00793457,0.015960693,0.014221191,-0.0013151169,-0.010185242,0.013366699,0.0018978119,0.028289795,0.009895325,0.01638794,-0.0019330978,-0.0014152527,-0.011680603,-0.029159546,-0.009353638,0.03050232,-0.016967773,0.030975342,-0.0019569397,0.043426514,-0.022399902,0.022445679,0.03253174,-0.03942871,0.0069847107,-0.0007696152,0.045654297,0.013313293,-0.013679504,0.021484375,0.012145996,0.02532959,-0.06542969,-0.008224487,-0.00058460236,0.02406311,-0.03970337,-0.04055786,-0.05090332,-0.01725769,0.027053833,0.0062217712,0.019226074,0.029846191,-0.017364502,0.009208679,0.0047416687,0.006324768,-0.008514404,-0.0034732819,-0.03036499,-0.023086548,-0.0053367615,0.028137207,-0.021850586,0.018173218,0.007904053,-0.027008057,0.005180359,-0.022827148,-0.0010404587,-0.0023288727,-0.015625,0.037994385,0.0025348663,0.009437561,-0.03161621,-0.025039673,0.015945435,0.0065994263,0.019622803,-0.04852295,0.014595032,-0.0012340546,0.0032749176,-0.011177063,0.0004916191,0.01360321,0.007003784,0.0016298294,0.028717041,-0.056762695,0.023529053,-0.01838684,-0.0056495667,0.0027599335,-0.023117065,-0.0063972473,-0.023651123,0.009918213,0.043670654,-0.0040397644,-0.035980225,-0.029846191,-0.074401855,-0.012817383,-0.043060303,0.0023670197,0.017608643,0.0234375,-0.03274536,0.01876831,0.0029735565,-0.00072813034,-0.010528564,0.0022296906,0.015312195,0.04196167,0.019134521,0.024887085,-0.02532959,-0.026931763,-0.0059547424,-0.004535675,-0.0012588501,-0.02217102,-0.023757935,0.009933472,0.02809143,0.00010305643,-0.036712646,-0.007160187,-0.0041275024,-0.026397705,0.034851074,-0.0017147064,0.012626648,-0.011695862,-0.028915405,0.008468628,0.006996155,-0.008369446,0.0129852295,0.008117676,-0.014442444,-0.04840088,0.008056641,0.020202637,0.0028820038,0.009002686,-0.04611206,-0.0044670105,-0.023422241,-0.03982544,-0.006275177,-0.014671326,0.009887695,-0.020126343,0.0013990402,-0.06530762,0.011116028,0.008148193,-0.0025558472,0.043395996,0.025405884,0.020553589,-0.008049011,0.010894775,-0.014144897,-0.021347046,-0.03753662,0.017486572,0.009437561,-0.0033779144,0.038726807,0.0435791,0.00356102,-0.025741577,-0.0010080338,-0.014556885,0.0016546249,-0.0023384094,0.031829834,-0.018432617,0.00497818,0.0012235641,-0.020889282,-0.03652954,-0.013969421,0.07757568,0.0067825317,0.007129669,0.0052871704,-0.010795593,0.023803711,0.013893127,-0.025924683,0.014442444,-0.017440796,-0.0041542053,-0.014694214,0.023956299,-0.009391785,0.022766113,-0.0340271,-0.04650879,-0.009941101,-0.03375244,-0.027450562,-0.07342529,-0.021743774,-0.04837036,0.008010864,-0.012046814,-0.036956787,0.013298035,0.008476257,-0.0041236877,-0.069885254,0.0059394836,0.037994385,-0.015197754,0.031204224,0.003643036,0.022766113,0.026748657,-0.0049057007,0.00043177605,0.011985779,-0.048614502,-0.013549805,-0.030975342,0.027908325,0.012130737,-0.01701355,0.0287323,0.0019664764,0.017486572,-0.03326416,0.01977539,-0.0072402954,0.0008997917,-0.020965576,0.00031352043,-0.017791748,0.02142334,0.05621338,-0.030090332,0.023468018,-0.009994507,-0.010696411,0.01424408,0.03149414,0.050079346,-0.0236969,0.01991272,0.0035762787,0.008163452,0.044311523,-0.030090332,0.028366089,0.033447266,-0.012565613,0.01486969,0.015838623,-0.02822876,-0.022476196,-0.021865845,0.034729004,-0.008033752,0.001824379,-0.006755829,0.01146698,-0.04034424,0.018417358,0.010940552,0.0021076202,-0.0127334595,-0.029144287,-0.022125244,0.013450623,0.007926941,-0.009170532,0.01966858,0.018707275,0.03933716,-0.018218994,-0.018066406,-0.0010213852,0.020202637,0.017364502,-0.009498596,0.031799316,-0.008178711,0.0064697266,0.020858765,0.0074157715,-0.034484863,-0.011520386,-0.030349731,-0.01159668,-0.0039367676,-0.029388428,0.0075683594,0.010604858,-0.0065689087,-0.0023288727,-0.009681702,0.005771637,-0.026245117,-0.011199951,-0.018966675,-0.015235901,0.028381348,-0.0015068054,0.0047569275,0.04019165,-0.001909256,0.04421997,0.007698059,-0.016036987,0.02078247,0.037139893,0.005317688,-0.029586792,-0.01687622,0.005268097,0.000005364418,0.0026721954,-0.016525269,0.003917694,0.04135132,-0.0124435425,-0.0031356812,0.01751709,0.027908325,-0.027435303,-0.0010633469,-0.01638794,0.034057617,0.008613586,0.01878357,-0.049957275,0.030075073,0.006542206,-0.00982666,0.009666443,-0.019744873,-0.0141067505,0.036132812,0.016952515,-0.009819031,0.039978027,-0.00440979,0.048034668,-0.0146484375,-0.02708435,0.027740479,-0.016723633,-0.030227661,0.024765015,0.013587952,-0.0033950806,0.011924744,-0.031051636,0.048950195,-0.015571594,-0.017318726,-0.008224487,-0.0030231476,-0.019729614,-0.024932861,0.0040359497,-0.017074585,-0.02268982,-0.014533997,0.0021438599,0.044525146,0.019500732,0.028793335,0.025390625,0.0231781,-0.0036354065,-0.03086853,-0.057739258,0.00042939186,0.008468628,0.0340271,0.0059051514,0.047607422,0.06890869,0.011116028,0.021636963,0.019714355,0.038909912,0.00013124943,0.01991272,-0.039276123,0.01411438,-0.0140686035,-0.011627197,0.004425049,0.036346436,-0.010765076,0.004131317,-0.0021476746,0.031311035,-0.024414062,0.039367676,0.056518555,0.0031967163,-0.00017726421,0.018127441,-0.0033473969,-0.06201172,0.00818634,-0.026947021,0.054260254,0.01474762,0.046142578,0.060699463,0.012908936,0.0009012222,0.012535095,-0.023864746,-0.019226074,0.040222168,0.026504517,-0.01134491,-0.014228821,-0.030349731,0.003929138,-0.03378296,-0.023712158,-0.00033783913,0.008308411,-0.0012845993,-0.00019860268,-0.002588272,0.0029258728,0.031311035,0.029220581,-0.010475159,0.008079529,0.024124146,0.020843506,0.0064315796,0.03894043,-0.012840271,0.02519226,-0.031280518,-0.030151367,0.0018749237,-0.006175995,-0.012374878,-0.034729004,0.022659302,0.0049934387,0.04284668,0.038269043,-0.007873535,0.023483276,0.01259613,0.004470825,0.02104187,0.051361084,0.010604858,-0.003967285,0.02659607,0.024368286,0.01600647,0.004863739,0.015808105,0.011924744,-0.013214111,-0.013000488,-0.0029678345,0.024597168,-0.0000064969063,0.023742676,-0.0049972534,-0.0043182373,0.0002682209,0.031402588,0.010749817,0.0028800964,-0.005592346,0.023910522,-0.018569946,0.014457703,-0.0006632805,-0.015312195,0.03842163,0.01826477,0.050445557,-0.009971619,0.016098022,0.000030338764,-0.021499634,-0.01939392,0.00491333,-0.0413208,0.011138916,0.0055656433,-0.021392822,-0.037841797,0.017837524,0.0070343018,-0.01864624,0.04824829,0.029541016,-0.025100708,0.004875183,0.03277588,0.0007762909,-0.0009074211,0.0038833618,-0.025802612,0.010025024,0.04574585,0.024795532,-0.0012407303,-0.037628174,-0.008453369,0.011955261,0.0043258667,-0.018859863,0.008934021,-0.0017642975,-0.0054740906,0.016586304,0.0077552795,0.011634827,0.015533447,-0.026824951,0.0008187294,0.014144897,0.01977539,0.016159058,-0.01083374,-0.014015198,0.024353027,-0.0041503906,0.025512695,0.038024902,0.005054474,0.016326904,0.00011718273,-0.0013055801,-0.005809784,-0.0018577576,0.019561768,-0.016433716,0.0030326843,-0.0077934265,0.028717041,-0.019561768,-0.012901306,-0.01096344,-0.005809784,-0.023803711,0.0030937195,0.028335571,0.016586304,0.024108887,0.03741455,0.012763977,-0.034851074,0.056121826,-0.03564453,0.045318604,-0.01838684,0.012145996,0.06188965,0.045837402,0.042266846,-0.012481689,0.020370483,-0.035614014,-0.0005970001,0.05142212,0.01977539,0.018600464,-0.0076942444,-0.025878906,0.03439331,-0.0041275024,0.042053223,-0.03668213,0.0020866394,0.009025574,-0.025894165,-0.012229919,-0.0053634644,-0.0022277832,0.0033435822,0.025039673,-0.026031494,-0.009902954,-0.0138168335,-0.01058197,0.0054016113,-0.019500732,-0.016403198,0.001742363,-0.03012085,0.0038909912,0.0041236877,-0.0026416779,0.019134521,0.02178955,-0.03326416,-0.012336731,0.0024642944,0.023727417,-0.0129776,0.023849487,0.04071045,0.008110046,0.034484863,0.026107788,-0.019989014,0.022079468,-0.0033473969,0.02041626,0.03527832,-0.0038146973,-0.008041382,0.024154663,0.00029683113,-0.018234253,0.017578125,0.047729492,-0.0029335022,0.009750366,0.0031051636,0.014320374,-0.007003784,0.009712219,-0.028533936,0.0074043274,-0.0023841858,-0.026107788,0.0065994263,0.029144287,-0.017868042,0.0038776398,-0.00015461445,-0.01007843,0.012374878,0.040740967,0.04522705,-0.03765869,-0.013061523,0.006134033,-0.024597168,-0.007762909,-0.012336731,-0.009101868,-0.037384033,0.017059326,0.028289795,0.0041236877,0.026977539,-0.015731812,-0.017333984,0.015037537,0.010002136,0.008071899,-0.015808105,-0.014541626,0.0059928894,-0.02029419,-0.00093889236,-0.016159058,-0.009857178,0.000024855137,0.030578613,-0.008224487,-0.037628174,0.0149002075,-0.023117065,0.005882263,-0.008415222,0.00082445145,0.022567749,0.005744934,-0.0077438354,0.006427765,0.00031661987,-0.010498047,-0.008758545,-0.00920105,0.0034675598,0.04626465,0.0006327629,-0.0003092289,0.015487671,0.041870117,0.009971619,0.034484863,0.0045700073,0.048797607,0.017196655,-0.016799927,-0.034210205,0.0000060796738,-0.028579712,-0.018692017,0.010040283,-0.036987305,-0.027404785,0.014717102,-0.0010490417,-0.015182495,-0.023040771,0.0044403076,-0.009857178,-0.0008635521,0.037017822,-0.014305115,-0.0028438568,-0.0016422272,0.015716553,0.021865845,-0.028457642,-0.04977417,-0.0039596558,-0.009773254,-0.025772095,-0.058135986,0.018310547,-0.025726318,-0.01411438,-0.013252258,0.00024533272,0.013717651,0.023208618,-0.017913818,-0.004306793,-0.014984131,0.023666382,0.017669678,0.0013370514,0.020019531,-0.036376953,-0.05178833,-0.03289795,-0.018432617,-0.018295288,0.04321289,0.007549286,0.013587952,0.021408081,-0.03277588,-0.0052833557,-0.0055732727,-0.0027046204,-0.0056915283,-0.007774353,-0.04336548,0.012763977,0.03869629,-0.011985779,0.0036239624,0.045043945,-0.012626648,-0.022766113,0.012924194,0.039794922,0.0078048706,0.018005371,0.011451721,-0.00818634,-0.005420685,-0.0025177002,-0.015808105,0.005004883,0.010848999,0.00894928,-0.010566711,0.018859863,0.009460449,0.006313324,0.0090408325,0.018859863,-0.004207611,-0.0066452026,0.019363403,0.015083313,-0.003698349,-0.008995056,-0.0065612793,-0.0002605915,0.06088257,0.031311035,0.015144348,-0.0104599,0.0048446655,-0.026672363,0.0023841858,0.020629883,-0.016113281,-0.034729004,-0.018737793,-0.027053833,-0.0049934387,-0.009979248,0.009155273,0.0054855347,0.030349731,-0.0020656586,-0.04864502,-0.010971069,0.045532227,0.008865356,-0.020431519,-0.012741089,0.0063209534,0.0067825317,-0.032440186,-0.0067253113,-0.039367676,-0.03338623,0.0077171326,0.0031471252,0.012809753,0.0024642944,-0.013870239,0.009033203,0.013725281,-0.024856567,0.008644104,0.01676941,-0.020431519,-0.00016188622,0.0011081696,0.03274536,-0.008117676,0.0018491745,-0.0020980835,0.012252808,-0.014579773,-0.018997192,0.027008057,-0.019515991,0.0045318604,0.011817932,0.0013103485,0.017593384,0.0050621033,0.004383087,-0.041046143,-0.00409317,0.01322937,-0.014923096,0.030288696,-0.016860962,-0.02331543,-0.013137817,-0.029434204,-0.045684814,0.010406494,0.02607727,0.0118637085,0.00084638596,0.03778076,-0.036499023,0.005012512,-0.010757446,0.014732361,-0.030426025,-0.018920898,0.02407837,-0.014480591,-0.00019443035,-0.01574707,-0.0011749268,-0.025436401,-0.023742676,0.0052261353,0.009140015,0.0017223358,0.019699097,0.0259552,0.028564453,-0.0002989769,0.022323608,0.0026664734,0.00040006638,0.017318726,-0.0019283295,0.047851562,-0.039245605,-0.036346436,-0.004962921,0.0078125,-0.006626129,-0.009666443,0.017349243,-0.014259338,-0.028366089,0.007423401,0.003967285,0.03225708,-0.006225586,0.017333984,-0.023223877,-0.010726929,-0.026107788,-0.005207062,-0.037841797,0.017654419,0.033721924,0.018966675,0.0035114288,-0.024108887,-0.03515625,0.031463623,0.0073928833,0.017990112,-0.043304443,-0.031799316,0.0022239685,0.002708435,0.001581192,0.018966675,-0.033477783,-0.0039138794,0.013450623,-0.0000821352,0.009567261,0.009552002,0.018676758,-0.0079956055,-0.011352539,0.004714966,0.027023315,-0.020584106,-0.0058135986,-0.023895264,-0.0031223297,0.039794922,0.007827759,-0.019134521,0.022521973,0.025161743,-0.040985107,0.051330566,-0.020523071,0.00056552887,-0.005622864,0.0030822754,-0.041381836,-0.0048446655,0.012680054,0.0025348663],"createdAt":"2026-04-21T18:32:12.398Z","updatedAt":"2026-04-22T02:31:50.596Z","lastSeenAt":"2026-04-22T02:31:50.596Z","tsv":"'/api/v1/emails/39/attachments':148 '0.02':10,22,52,115 '000':56 '20':55 '39':37 '6':60 'Base USDC API' 'accept':64 'access':30 'advertis':75 'ai/ml':87 'analysi':89 'analyt':86 'api':83,120,169 'appear':149 'application/json':69 'attach':3,15,33,152 'avail':199 'base':8,20,49,57,139 'behind':38 'beyond':160 'broader':72 'call':82 'classif':91 'commit':127 'connect':178 'content':203 'convers':108 'crawl':202 'data':85,153 'decim':61 'detail':185 'doc':168 'document':159,194 'email':2,14,32,35,157 'email attachment API' 'email-attachments' 'embed':92 'endpoint':26,63,111,144 'entir':132 'estim':102 'exampl':198 'exchang':97 'extrem':165 'feed':96 'financ':93 'gas':101 'generat':109 'geocod':106 'handl':131 'id':36 'infrastructur':104 'key':121 'l2':140 'land':162 'limit':124 'list':113,146 'lowpaymentfee email' 'lowpaymentfee.com':28,73 'micropay':6,18 'micropayment email access' 'network':50,141 'no-api-key' 'openapi':189 'page':163,173 'particular':156 'pay':80 'pay-per-cal':79 'pay-per-call email' 'pay-per-request' 'payment':42,129 'paywal':41 'per':11,23,53,81,116 'platform':74 'post':65 'price':95,170 'prompt':180 'protocol':136 'provid':29 'quot':100 'rate':98,123 'readm':172 'render':175 'request':12,24,54,66,117 'request/response':192 'requir':128 'resourc':158 'respons':70 'retriev':1,13 'return':68 'schema':193 'sentiment':88 'serv':151 'settl':44 'span':84 'spars':166 'spec':190 'specif':34,143 'suit':77 'summar':90 'technic':184 'token':99 'unit':58 'usag':197 'usdc':46 'usdc-base' 'util':105 'valid':107 'via':4,16,133 'wallet':179 'web3':94 'x402':5,17,40,135 'x402 email endpoint' 'x402-payment'","prices":[{"id":"42dad609-e594-425a-81f8-b5685e1c1795","listingId":"2ad4d7af-1163-4376-9edf-b68da1403e28","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/39/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":"2026-04-21T18:32:12.398Z"}],"sources":[{"listingId":"2ad4d7af-1163-4376-9edf-b68da1403e28","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/39/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.398Z","lastSeenAt":"2026-04-22T02:31:50.596Z"}],"details":{"listingId":"2ad4d7af-1163-4376-9edf-b68da1403e28","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/39/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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/39/attachments"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/emails/39/attachments"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email attachments programmatically with per-request micropayments","Agents that need to fetch email attachment data without pre-registration or API keys","Automated workflows that access stored email content on a pay-as-you-go basis"],"bestFor":["Agents needing keyless, on-demand email attachment retrieval","Developers testing x402 payment flows on Base","Low-volume, pay-per-use access to email data"],"notFor":["Bulk email processing requiring high throughput at low cost","Users who need detailed API documentation or SDKs before integrating","General-purpose email sending or SMTP relay"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.756Z"},"updatedAt":"2026-04-22T02:31:50.596Z"}}