{"id":"539f77fd-ff75-45fe-a6f8-5187bf083b02","shortId":"6qsdL6","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/72` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transfers/72` is unclear — the description is simply \"Premium API Access\" with no further documentation, input schema, or example responses available. The docs, pricing, and README pages on the site all render only a \"Connect wallet\" prompt with no substantive content. Without documentation or response examples, the actual behavior of this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/transfers/72 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, input schema, or response examples are provided anywhere on the site.","All documentation pages (docs, pricing, README) render only 'Connect wallet' with no content.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have verifiable documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/72","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/transfers/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no input/output schema, no example responses, and the actual functionality of '/api/v1/transfers/72' is entirely opaque. The site's docs/pricing/README pages are empty beyond a wallet-connect prompt.","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":"2026-04-19T14:17:22.326Z","embedding":[-0.025115967,-0.039489746,0.04446411,0.026885986,0.007926941,-0.02810669,-0.020568848,0.034301758,0.07458496,-0.06439209,0.031799316,-0.036590576,-0.035064697,-0.029830933,-0.026138306,0.004306793,0.0013999939,-0.0018091202,-0.035247803,0.035339355,0.032714844,-0.015731812,-0.044128418,0.029510498,0.010360718,-0.026107788,-0.009468079,-0.01360321,-0.011054993,-0.030731201,0.030960083,-0.02998352,-0.008811951,0.010856628,-0.020446777,-0.01576233,0.00085163116,0.041168213,0.020248413,-0.0014915466,0.0031490326,-0.057006836,-0.0035266876,-0.021453857,-0.052612305,0.0040893555,-0.00919342,-0.026733398,0.0018644333,-0.000116705894,-0.028961182,-0.008392334,-0.018600464,0.009933472,0.009666443,0.013214111,0.000102996826,-0.008476257,0.0025119781,0.019119263,-0.012901306,-0.058654785,-0.018249512,-0.011489868,0.007888794,0.053894043,-0.011650085,0.046539307,0.012451172,0.07342529,0.03604126,0.051635742,0.038604736,0.014511108,-0.00075912476,0.004058838,-0.012962341,0.05178833,-0.009216309,-0.023162842,-0.008911133,-0.023162842,-0.05065918,0.009284973,-0.019454956,-0.029067993,-0.020355225,0.016189575,-0.0025749207,0.018234253,-0.070129395,0.0049591064,-0.008964539,0.004673004,0.002779007,-0.0129470825,0.0024642944,0.024978638,-0.008865356,0.014976501,-0.009963989,-0.04220581,0.017181396,0.012634277,0.03817749,0.035980225,0.019226074,0.023223877,0.00868988,-0.0071754456,-0.018997192,0.016723633,-0.012565613,0.00027036667,0.016708374,-0.0064849854,-0.005771637,0.008735657,-0.03616333,0.026245117,-0.059692383,0.036224365,0.01399231,-0.0024318695,0.0019340515,-0.046813965,-0.010620117,0.024902344,-0.023132324,-0.008224487,0.02784729,0.00894165,0.028427124,-0.016586304,-0.033233643,0.0107040405,-0.024856567,-0.010124207,-0.04788208,-0.035217285,0.03793335,-0.028167725,0.013755798,0.0418396,-0.10736084,-0.009170532,-0.026947021,0.016326904,-0.032196045,-0.0044517517,-0.005924225,0.025024414,-0.010124207,-0.018966675,-0.02532959,-0.024276733,0.008644104,0.03161621,-0.016174316,0.05230713,-0.028030396,0.021118164,0.0046577454,0.0060272217,0.01751709,0.02067566,-0.0087509155,-0.08166504,-0.08306885,-0.008705139,-0.006904602,-0.014549255,-0.034698486,0.020065308,-0.0027446747,-0.067993164,-0.01600647,-0.037902832,-0.002752304,-0.045318604,0.003545761,-0.028015137,0.017318726,-0.0041122437,-0.072021484,-0.020477295,-0.01626587,0.05606079,0.027954102,0.025848389,0.033111572,-0.020889282,0.064941406,0.018173218,-0.028244019,-0.025268555,0.022155762,-0.015380859,0.012527466,-0.008781433,0.017990112,-0.034606934,0.03616333,0.068237305,-0.0019817352,-0.029144287,-0.003068924,-0.063964844,-0.044799805,-0.027435303,0.015670776,0.015197754,-0.011672974,0.039916992,-0.04498291,-0.03378296,0.0041046143,0.021713257,0.012496948,0.061920166,0.006290436,-0.015213013,0.020507812,0.023208618,-0.05316162,0.03692627,0.035827637,0.015586853,-0.037139893,-0.02507019,0.032562256,0.038604736,-0.026107788,0.008529663,-0.0045661926,0.027770996,-0.015052795,0.0013837814,0.008651733,-0.013496399,-0.02078247,-0.025314331,-0.025268555,0.025161743,-0.002040863,-0.03189087,-0.03137207,-0.08319092,0.055511475,0.034057617,0.039489746,-0.001876831,0.0029239655,-0.014732361,-0.014678955,-0.064941406,0.059814453,0.07098389,-0.0056762695,-0.016220093,0.027389526,-0.0126953125,-0.037261963,0.017044067,-0.0073394775,-0.034454346,-0.018371582,0.013641357,-0.046875,0.0087890625,0.025466919,0.031433105,0.04727173,-0.0048217773,-0.055023193,-0.022140503,-0.0067634583,0.0024414062,-0.02456665,-0.0017404556,-0.010681152,0.011726379,0.0077819824,0.008041382,0.018951416,-0.0046539307,0.004245758,0.0052261353,0.008544922,-0.020980835,-0.03274536,0.013404846,0.0011358261,-0.049194336,-0.0010414124,-0.007171631,0.07519531,-0.04748535,0.034362793,-0.0045280457,0.0054779053,0.053955078,-0.0010547638,-0.03994751,0.010795593,0.023086548,0.0068588257,0.04940796,0.010253906,-0.03289795,-0.014785767,0.07495117,-0.018661499,-0.0050468445,0.010726929,0.023864746,0.031097412,-0.0048294067,-0.057250977,-0.03475952,-0.010147095,-0.04776001,0.024261475,-0.023452759,0.03378296,-0.008308411,0.0007863045,-0.02583313,0.004501343,-0.02746582,0.0053749084,-0.012191772,0.007133484,-0.024551392,-0.010673523,0.022079468,0.008163452,-0.004901886,0.0067214966,0.037322998,0.025100708,-0.0027179718,-0.025741577,-0.021850586,-0.007671356,-0.0009727478,0.031463623,0.01739502,0.028182983,0.0574646,-0.04019165,0.011543274,0.022384644,0.0231781,0.019851685,-0.012550354,0.002817154,-0.06939697,-0.05819702,-0.026138306,-0.042877197,0.03894043,0.007183075,-0.006340027,0.039001465,0.016815186,-0.019500732,-0.040496826,0.016921997,-0.050720215,0.00005555153,0.043029785,-0.02079773,-0.02230835,0.008110046,-0.00045633316,0.009185791,0.029769897,0.011505127,0.030136108,0.074645996,0.044830322,0.0006299019,0.018798828,-0.004962921,0.017456055,0.0073776245,-0.03060913,-0.023910522,-0.014976501,0.03314209,-0.019821167,-0.015197754,-0.06915283,0.045135498,0.043640137,0.09295654,0.018112183,0.0038051605,0.023498535,-0.013290405,0.017974854,-0.032562256,-0.019439697,-0.020370483,-0.04736328,0.034851074,-0.011695862,-0.016403198,-0.02507019,0.045013428,-0.009529114,0.024734497,-0.025421143,0.043762207,-0.0077171326,-0.02116394,0.017868042,0.008232117,0.041992188,0.06939697,-0.048675537,0.022155762,0.026947021,-0.017562866,-0.0067443848,0.033111572,-0.016189575,-0.0058135986,-0.056488037,-0.0289917,-0.018188477,-0.007499695,-0.04522705,0.02079773,0.021194458,0.025131226,0.023132324,-0.008331299,-0.009994507,-0.007331848,-0.012489319,-0.0569458,0.0046310425,-0.033081055,0.00894928,0.04837036,-0.027404785,-0.004573822,-0.00029492378,-0.008644104,-0.008369446,0.0016431808,0.026382446,-0.00049972534,-0.044799805,0.026000977,0.011634827,0.011154175,0.008155823,0.02961731,0.023208618,0.042663574,0.041931152,0.023712158,-0.013847351,-0.067871094,0.016708374,-0.0491333,0.0015220642,0.020065308,-0.025802612,0.004108429,-0.017807007,-0.030395508,-0.025131226,0.02168274,-0.03286743,0.0045700073,0.022750854,-0.008834839,-0.03189087,-0.05291748,-0.027832031,-0.000015676022,0.061157227,0.023620605,0.024963379,-0.07446289,-0.012397766,0.030090332,0.014640808,0.033843994,-0.014289856,-0.0069885254,-0.017501831,-0.029144287,-0.014701843,-0.021957397,0.02746582,-0.0048675537,-0.010467529,0.017745972,0.0077285767,0.024536133,0.008255005,0.021118164,0.029953003,-0.03186035,-0.010688782,-0.0040893555,0.032073975,0.012832642,-0.011207581,-0.057006836,0.044677734,0.014312744,0.031021118,-0.043426514,-0.009132385,-0.017730713,0.016189575,0.0075149536,-0.006679535,-0.003364563,-0.0034008026,-0.043914795,-0.051757812,0.054107666,-0.0287323,0.026397705,0.02658081,0.0065460205,0.014656067,-0.0049819946,-0.012649536,0.012969971,-0.019638062,-0.004585266,-0.018600464,-0.029067993,-0.02482605,-0.015640259,-0.024017334,0.0284729,-0.022033691,0.018951416,0.001917839,-0.021087646,0.018859863,-0.009819031,-0.0012197495,0.013015747,0.006893158,0.023727417,0.0309906,0.013496399,-0.043151855,0.015716553,-0.007926941,0.0079956055,0.0030212402,0.04058838,0.024002075,0.0012540817,0.00844574,-0.010665894,-0.022323608,-0.0158844,-0.0043182373,0.010032654,0.019454956,-0.003967285,-0.032440186,0.014251709,0.00774765,-0.029953003,-0.031799316,0.015960693,0.009300232,-0.03201294,0.020507812,0.032592773,0.045715332,-0.021102905,-0.009170532,0.0002605915,0.0234375,0.03289795,0.014350891,-0.014198303,0.017959595,-0.017288208,0.018692017,-0.0030593872,-0.011764526,0.027389526,0.0010147095,0.024627686,0.021408081,0.0087890625,-0.030731201,-0.041168213,0.00009435415,-0.014007568,-0.028396606,0.025985718,0.014770508,0.027404785,-0.027755737,0.019073486,0.014785767,-0.025421143,-0.015052795,-0.010345459,0.04296875,-0.02154541,-0.017745972,0.013397217,0.020584106,0.033325195,-0.05239868,0.0017242432,-0.004638672,0.015838623,-0.019439697,-0.040100098,-0.037384033,0.012283325,0.03579712,0.0044441223,0.017044067,0.03253174,-0.0067863464,0.009902954,0.030258179,-0.0029506683,-0.013053894,-0.020828247,-0.03643799,-0.019180298,-0.007610321,0.0009293556,-0.02961731,0.0073776245,-0.004611969,-0.034179688,0.008644104,-0.010749817,-0.0034561157,-0.0104904175,0.0075416565,0.03656006,-0.0033454895,0.020980835,-0.013435364,-0.047912598,0.004348755,-0.0019397736,0.016784668,-0.047332764,0.012123108,-0.018692017,-0.0019989014,0.009918213,0.010818481,0.016418457,0.020721436,0.008865356,0.037719727,-0.04663086,0.039520264,-0.034057617,0.0029582977,-0.005344391,-0.041229248,-0.017028809,-0.020553589,-0.019836426,0.040863037,-0.03186035,-0.012802124,-0.02355957,-0.033050537,-0.010864258,-0.057525635,0.021240234,0.03668213,0.0317688,-0.028274536,-0.0030326843,-0.0021419525,0.0055122375,-0.017456055,0.0026245117,-0.013473511,0.018234253,0.02809143,0.002204895,-0.043945312,-0.028427124,-0.02130127,-0.0075912476,-0.039245605,-0.04776001,-0.018569946,0.008270264,-0.011291504,-0.007980347,-0.02609253,-0.030578613,0.0002901554,-0.038635254,0.0025520325,0.014221191,0.02003479,0.007221222,-0.033416748,0.0028533936,0.015838623,-0.012130737,0.043151855,0.0070610046,-0.001496315,-0.039093018,0.007873535,0.00856781,0.02909851,-0.0045204163,-0.021743774,-0.005558014,-0.01309967,-0.06628418,-0.004333496,-0.0033454895,-0.014808655,-0.0034370422,-0.0021095276,-0.053100586,-0.0049324036,-0.010940552,0.0013036728,0.023010254,0.007156372,0.01852417,0.0022087097,0.01436615,-0.004852295,-0.0065307617,-0.01876831,0.015975952,0.010467529,0.0021305084,0.023483276,0.054779053,0.0067443848,-0.022232056,0.008232117,0.0026798248,0.017120361,-0.026153564,0.011123657,-0.014564514,0.009498596,-0.009101868,-0.016540527,-0.034362793,-0.0012140274,0.08325195,-0.0006079674,-0.010925293,-0.0107040405,-0.01864624,0.019348145,0.033935547,-0.034454346,-0.0065078735,-0.020248413,0.022399902,-0.02394104,0.012466431,0.010505676,0.01902771,-0.015655518,-0.06225586,-0.019210815,-0.012191772,-0.011314392,-0.054870605,-0.023956299,-0.07122803,0.0038795471,-0.006504059,-0.026657104,0.0010280609,0.016601562,-0.021759033,-0.08148193,-0.0004594326,0.056121826,0.01322937,0.027801514,-0.0112838745,0.020568848,0.030700684,-0.035186768,-0.0062294006,0.03253174,-0.026412964,-0.021011353,-0.023040771,0.02456665,-0.014846802,-0.026885986,0.013900757,0.015571594,0.017486572,-0.015716553,0.0037174225,-0.009254456,0.022735596,-0.01600647,0.01864624,-0.0135269165,-0.016220093,0.027618408,-0.045562744,0.021194458,0.013114929,-0.012481689,0.0033874512,0.027404785,0.03744507,-0.040405273,-0.02128601,0.018981934,0.009262085,0.03262329,-0.022476196,0.047332764,0.016143799,-0.020828247,0.0149002075,-0.0052871704,-0.018844604,-0.027282715,-0.021636963,0.02180481,-0.010025024,0.014183044,-0.023605347,0.0038318634,0.01386261,0.010597229,0.012138367,-0.009544373,-0.018081665,-0.016342163,-0.01109314,0.0066375732,0.0035686493,-0.004108429,0.02470398,0.024169922,0.03793335,0.0178833,-0.02128601,0.0005030632,0.03326416,-0.010627747,0.00009840727,0.020370483,0.0074157715,0.018463135,0.024932861,0.017913818,-0.046875,-0.01689148,-0.012489319,-0.020462036,-0.0052986145,0.0014429092,-0.011360168,-0.01436615,0.007675171,-0.008354187,-0.026611328,0.0028762817,-0.02557373,-0.026168823,-0.0031852722,-0.02217102,0.021362305,-0.0004107952,0.01423645,0.0035305023,-0.0038871765,0.034851074,-0.0025634766,-0.01725769,0.02230835,0.03643799,0.022598267,-0.034729004,-0.0018005371,-0.016479492,-0.013221741,0.002231598,-0.03741455,-0.0010852814,0.040222168,-0.014419556,-0.006084442,0.010673523,0.02558899,-0.0016021729,0.0029697418,-0.0071754456,0.022750854,-0.015853882,0.035461426,-0.0413208,0.020248413,0.007736206,-0.00069999695,-0.010223389,-0.0077667236,-0.030426025,0.015930176,0.012649536,-0.017044067,0.05239868,0.012435913,0.022567749,-0.019317627,-0.016311646,0.007709503,-0.026412964,-0.017150879,0.029846191,-0.008049011,0.000623703,0.007572174,-0.027069092,0.044006348,-0.030181885,0.022705078,0.007320404,0.0062065125,-0.007949829,-0.023788452,-0.0035076141,-0.012588501,-0.014015198,0.013587952,0.0010118484,0.049682617,0.02293396,0.024047852,0.05090332,0.01940918,-0.011116028,-0.035308838,-0.026138306,0.011680603,-0.020431519,0.0135269165,-0.017150879,0.055908203,0.034118652,0.003107071,0.041107178,0.03213501,0.029846191,0.0093688965,0.008766174,-0.016555786,0.017913818,0.011016846,0.03036499,-0.007896423,0.032409668,-0.028884888,0.02558899,0.008651733,0.027542114,-0.03652954,0.02999878,0.07287598,0.016799927,-0.013748169,0.037597656,-0.010856628,-0.012283325,-0.012527466,-0.02053833,0.05065918,-0.0041656494,0.057769775,0.05203247,0.017730713,-0.004131317,0.031204224,-0.01739502,-0.016067505,0.064697266,0.031173706,-0.014717102,-0.008811951,-0.00029301643,0.015434265,-0.04559326,-0.032165527,0.020721436,-0.018829346,0.012680054,0.005897522,-0.013442993,-0.0071640015,0.020187378,0.014160156,0.016708374,-0.011062622,0.027328491,0.03842163,-0.0016202927,0.022003174,-0.006072998,0.024978638,-0.023406982,-0.019805908,0.02130127,0.024520874,-0.007850647,-0.017196655,0.03036499,0.0058898926,0.039398193,0.044158936,-0.026809692,0.012260437,0.0309906,0.0069122314,-0.010917664,0.05441284,0.044799805,0.017150879,0.04083252,0.026290894,0.021911621,-0.04598999,0.026138306,0.0005598068,0.005531311,-0.00037837029,-0.012954712,0.005332947,-0.01675415,0.0076522827,0.01486969,-0.011871338,0.033355713,0.032714844,-0.0011768341,-0.0063171387,-0.00046730042,0.012702942,-0.02746582,-0.0031280518,0.00082826614,-0.018936157,0.041503906,0.0105896,0.033203125,-0.014694214,0.017364502,0.00068855286,-0.018936157,-0.00096940994,0.030960083,-0.029830933,0.0055999756,-0.0063323975,0.010292053,-0.0569458,0.010620117,0.029876709,-0.021896362,0.028793335,0.0042419434,-0.00869751,-0.006942749,0.026107788,0.010093689,-0.0010166168,-0.0134887695,-0.020477295,0.03955078,0.051239014,-0.000022768974,0.0059890747,-0.027236938,-0.0051612854,0.014808655,-0.007183075,-0.00029706955,-0.015586853,-0.024642944,-0.025146484,0.027313232,0.039489746,0.029327393,0.05834961,-0.027755737,-0.0068588257,-0.0010766983,0.038970947,0.002948761,-0.0038051605,-0.008132935,0.013183594,-0.0146102905,0.044677734,0.028793335,0.013473511,0.029953003,-0.0029392242,-0.020309448,0.0075798035,-0.011047363,0.016525269,-0.02406311,0.00141716,-0.0023040771,0.022079468,-0.007843018,-0.034088135,0.017181396,-0.015670776,-0.02861023,-0.014015198,0.0135269165,0.013679504,0.024368286,0.037261963,0.026123047,-0.017440796,0.061309814,-0.010375977,0.049468994,0.0025119781,-0.015182495,0.049713135,0.011070251,0.029052734,0.015975952,0.018951416,-0.033966064,0.022415161,0.034484863,0.016036987,0.009475708,0.0041275024,-0.016586304,0.03616333,0.0003209114,0.028701782,-0.015563965,0.0000057816505,0.01512146,-0.002565384,-0.0048599243,-0.008331299,-0.008995056,0.0054969788,0.05050659,-0.033569336,-0.01852417,-0.016784668,-0.015342712,0.019805908,-0.02130127,0.005592346,-0.004650116,-0.017654419,0.015930176,-0.021240234,-0.031921387,0.0018424988,0.024124146,-0.043762207,-0.018951416,-0.0033607483,0.020950317,-0.022232056,0.030548096,0.020812988,-0.0048294067,0.0019989014,0.04373169,-0.0061416626,0.03036499,-0.01499939,0.026611328,0.030700684,0.0038414001,-0.02368164,-0.002626419,0.004180908,-0.022338867,0.009590149,0.038482666,-0.0077552795,-0.0020446777,-0.008842468,-0.010147095,0.0055160522,0.007522583,-0.008514404,0.015365601,-0.017913818,-0.008544922,-0.01020813,0.011940002,0.0011749268,-0.0055007935,-0.013511658,-0.015342712,0.004501343,0.029510498,0.012702942,-0.03970337,-0.008132935,0.0043754578,0.015533447,-0.027236938,-0.009773254,-0.0041770935,-0.03894043,0.015571594,0.0061149597,0.013938904,0.01637268,-0.022079468,0.0022697449,0.025054932,0.020996094,0.019943237,0.004196167,0.0037994385,0.01991272,-0.0022678375,-0.0049972534,0.0048294067,-0.010032654,0.013832092,0.027359009,-0.0032520294,-0.032348633,0.025848389,-0.008354187,0.013885498,0.009094238,-0.017532349,0.015586853,-0.010360718,0.0016841888,0.0041046143,0.009529114,-0.012138367,-0.014472961,-0.019348145,0.035095215,0.05709839,-0.019317627,-0.003578186,0.027359009,0.016418457,0.020492554,0.038848877,0.00039482117,0.047210693,0.020446777,-0.017837524,-0.025222778,0.029953003,-0.008415222,-0.023101807,0.016113281,-0.0056419373,-0.019195557,0.017913818,0.014862061,-0.0006957054,-0.021591187,-0.014884949,-0.015365601,-0.0039367676,0.0132751465,-0.020523071,0.010177612,-0.023864746,-0.013015747,0.008857727,-0.029327393,-0.05078125,-0.021102905,-0.0035858154,-0.0037727356,-0.05429077,0.014884949,-0.03173828,0.002368927,-0.03692627,0.0019683838,-0.007217407,0.016708374,-0.022705078,-0.005092621,0.009994507,0.030288696,0.019256592,0.008216858,0.017547607,-0.027832031,-0.0287323,-0.020492554,0.012016296,-0.011932373,0.0074157715,0.012107849,0.03237915,0.02381897,-0.007881165,-0.0071907043,-0.009277344,-0.006538391,-0.020248413,-0.017715454,-0.028762817,0.030349731,0.015472412,-0.01878357,-0.014732361,0.049438477,-0.02545166,-0.020095825,0.03555298,0.040618896,0.0051460266,0.02861023,-0.023086548,-0.0062179565,-0.016830444,-0.006214142,-0.014884949,0.0063972473,0.00381279,-0.0018997192,-0.015434265,0.0033912659,0.023223877,-0.019088745,-0.012771606,0.029693604,0.00071907043,-0.011566162,0.03491211,0.017837524,0.0035114288,-0.020629883,-0.008216858,0.026977539,0.038757324,0.012207031,0.0039520264,-0.0009417534,0.0010700226,-0.015380859,0.010421753,0.014144897,-0.022247314,-0.044281006,-0.024673462,-0.025634766,0.0149383545,-0.0007596016,0.018432617,-0.007534027,0.025726318,-0.008522034,-0.020935059,-0.027282715,0.027404785,0.009475708,-0.014137268,-0.011123657,0.010665894,0.008644104,-0.03778076,-0.00032567978,-0.042388916,-0.034179688,-0.0037441254,-0.028884888,0.033721924,0.011329651,-0.0013780594,-0.011741638,-0.0074768066,-0.004798889,0.005935669,0.032714844,-0.017990112,0.0019254684,0.040496826,0.015563965,-0.020904541,0.023605347,-0.02268982,-0.0031700134,0.012840271,-0.0033779144,0.004802704,-0.01914978,0.030181885,-0.012756348,-0.004348755,0.02482605,-0.010879517,0.005821228,-0.029144287,0.009056091,-0.003692627,-0.0017910004,0.030258179,-0.029846191,-0.018157959,0.00070905685,-0.01637268,-0.03277588,0.0017681122,0.019042969,0.035064697,-0.006565094,0.04623413,-0.014213562,-0.010650635,0.022827148,0.0044670105,-0.017181396,0.0047721863,0.0368042,-0.0013303757,0.0008459091,-0.009132385,-0.014862061,-0.03125,0.00018906593,0.008277893,-0.0061035156,-0.012023926,0.029571533,0.018569946,0.044769287,0.002286911,0.020477295,0.0095825195,0.010437012,0.025497437,0.008743286,0.067871094,-0.0023517609,-0.015975952,0.0009012222,0.0037345886,-0.026046753,0.0007429123,-0.0011730194,0.0036735535,-0.038879395,0.01625061,-0.009132385,0.024902344,-0.022232056,0.01322937,-0.025436401,-0.009567261,-0.043121338,-0.011978149,-0.021194458,0.009284973,0.02168274,-0.0011520386,0.02798462,0.005203247,-0.027130127,0.013404846,0.045837402,-0.010063171,-0.03552246,-0.009254456,0.01725769,0.0009775162,0.013122559,0.008842468,-0.01373291,-0.017745972,0.0072669983,-0.014144897,0.0009889603,0.001698494,0.0129470825,0.0023021698,-0.0073127747,-0.014434814,0.028961182,-0.0069770813,-0.005016327,0.018005371,0.010818481,0.037384033,0.032196045,-0.01020813,0.013397217,0.020324707,-0.035888672,0.061035156,0.0041542053,0.024169922,-0.025604248,0.004234314,-0.03591919,-0.019989014,-0.013748169,0.010925293],"createdAt":"2026-04-18T19:27:52.965Z","updatedAt":"2026-04-22T12:04:44.490Z","lastSeenAt":"2026-04-22T12:04:44.490Z","tsv":"'/api/v1/transfers/72':56,160 '/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,169 'actual':206 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,168 'attach':93 'avail':179 'base':8,23,51,75 'behavior':207 'behind':159 'broader':106 'call':4,19,82 'caller':91 'cannot':211 'categori':111 'challeng':67 'classif':127 'confirm':213 'connect':193 'content':199 'convers':144 'crypto-paid API' 'data':113,117 'descript':164 'doc':181 'document':173,201 'embed':128 'endpoint':55,147,210 'estim':138 'exampl':177,204 'exchang':133 'export':118 'feed':132 'financ':129 'function':158 'gas':137 'generat':145 'geocod':142 'header':98 'howev':155 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'input':174 'insight':119 'key':85 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'page':185 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81,153 'platform':6,21,39,107 'premium':60,167 'premium API access' 'price':131,150,182 'prompt':195 'proof':104 'protocol':44 'quot':136 'rate':87,134 'readm':184 'render':190 'report':116 'request':37,154 'requir':68,90 'respons':178,203 'return':64 'schema':175 'sentiment':123 'simpli':92,166 'site':188 'specif':54,157 'substant':198 'summar':126 'text':125 'token':135 'unclear':162 'uniform':149 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':194 'web3':130 'without':200 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"0df8231e-e83e-4ae7-af67-63b846c00d7f","listingId":"539f77fd-ff75-45fe-a6f8-5187bf083b02","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/transfers/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:52.965Z"}],"sources":[{"listingId":"539f77fd-ff75-45fe-a6f8-5187bf083b02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:52.965Z","lastSeenAt":"2026-04-22T12:04:44.490Z"}],"details":{"listingId":"539f77fd-ff75-45fe-a6f8-5187bf083b02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/72 \\\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":"Endpoint returns 402 with x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/72"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/72"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making one-off API calls settled instantly in USDC on Base","Agent-driven workflows that need frictionless per-call billing"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.804Z"},"updatedAt":"2026-04-22T12:04:44.490Z"}}