{"id":"a788dce2-e286-470a-a3cb-6b87904cf722","shortId":"vUfUH7","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/transactions/146` 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/transactions/146` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The endpoint is confirmed live (402 challenge captured), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/146 is undocumented; 'Premium API Access' is the only description","No OpenAPI schema or request/response examples provided","No way to verify what data or service is returned after payment without actually paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/146","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/transactions/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific purpose of '/api/v1/transactions/146' is entirely opaque beyond the generic label 'Premium API Access.'","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":"2026-04-19T12:16:46.113Z","embedding":[-0.027526855,-0.03652954,0.039642334,0.013061523,0.008117676,-0.02394104,-0.025604248,0.02027893,0.07171631,-0.07159424,0.026901245,-0.036468506,-0.036590576,-0.028305054,-0.021713257,0.0071983337,-0.0059013367,0.00995636,-0.040618896,0.027160645,0.03036499,-0.015014648,-0.038330078,0.025146484,0.0044136047,-0.010620117,-0.009666443,-0.019012451,-0.0206604,-0.038330078,0.049743652,-0.028381348,-0.0059814453,0.008415222,-0.012924194,-0.010765076,0.00065279007,0.030319214,0.033477783,-0.011398315,0.0037517548,-0.060699463,0.0017089844,-0.016296387,-0.048034668,-0.000808239,0.0018186569,-0.028381348,0.009437561,-0.0035629272,-0.03677368,-0.005432129,-0.014579773,0.009567261,0.0053520203,0.008705139,-0.0059547424,-0.0077934265,0.011604309,0.013763428,-0.021270752,-0.06298828,-0.016860962,-0.008598328,-0.00071811676,0.056549072,-0.010070801,0.036468506,0.005142212,0.070007324,0.033355713,0.05303955,0.034729004,0.018371582,0.00121212,-0.0015382767,-0.0015249252,0.055267334,-0.00920105,-0.023910522,-0.004383087,-0.014320374,-0.057373047,0.00048184395,-0.014656067,-0.039245605,-0.023880005,0.02532959,-0.018127441,0.02545166,-0.07098389,0.002981186,-0.0029888153,-0.0024147034,-0.0013132095,-0.0063438416,-0.013084412,0.026245117,-0.0066604614,0.011779785,-0.006614685,-0.04421997,0.030273438,0.008621216,0.034179688,0.047973633,0.023361206,0.02961731,0.006439209,-0.002456665,-0.032806396,0.021087646,-0.0059928894,-0.010978699,0.01637268,0.0017576218,-0.00680542,0.013656616,-0.02897644,0.028915405,-0.051971436,0.05633545,0.0082092285,-0.005619049,-0.0029659271,-0.042938232,-0.01776123,0.027267456,-0.021896362,-0.0029144287,0.016342163,0.018630981,0.023880005,-0.016586304,-0.02961731,0.022033691,-0.022628784,-0.012519836,-0.052764893,-0.03152466,0.040496826,-0.02633667,0.021835327,0.055877686,-0.103759766,-0.0065612793,-0.04925537,0.0069007874,-0.029586792,-0.012260437,-0.0008211136,0.027832031,-0.013015747,-0.013427734,-0.028427124,-0.031707764,0.00415802,0.040008545,-0.019989014,0.043914795,-0.029083252,0.020095825,0.021911621,0.013435364,0.018508911,0.022628784,-0.0008625984,-0.07434082,-0.08898926,-0.018936157,0.0052719116,-0.018539429,-0.03591919,0.012741089,-0.0118637085,-0.080322266,-0.01991272,-0.02003479,-0.00091028214,-0.04425049,-0.0066604614,-0.028457642,0.02444458,-0.0009264946,-0.060272217,-0.031219482,-0.029724121,0.059143066,0.030731201,0.021072388,0.024871826,-0.016998291,0.056243896,0.030700684,-0.01763916,-0.016693115,0.02357483,-0.01687622,0.013389587,-0.0033893585,0.012245178,-0.03692627,0.033111572,0.07525635,-0.0025749207,-0.025314331,-0.009780884,-0.06829834,-0.04156494,-0.031143188,0.017929077,0.013175964,-0.006038666,0.03375244,-0.03829956,-0.030960083,0.010284424,0.01071167,0.019226074,0.057800293,0.0057640076,-0.013893127,0.03503418,0.021636963,-0.050445557,0.03643799,0.040100098,0.014450073,-0.032287598,-0.032836914,0.02923584,0.046447754,-0.021835327,0.018234253,-0.012619019,0.030059814,-0.016174316,0.0039901733,0.016738892,-0.014419556,-0.024246216,-0.024215698,-0.01574707,0.026229858,0.014671326,-0.031402588,-0.029907227,-0.08325195,0.050933838,0.04425049,0.0385437,-0.00044107437,-0.004425049,-0.02041626,-0.016021729,-0.06506348,0.05444336,0.07019043,-0.008811951,-0.0054397583,0.030395508,-0.012123108,-0.03933716,0.0045547485,-0.021087646,-0.032989502,-0.017318726,0.012802124,-0.036224365,-0.00040531158,0.02279663,0.022567749,0.04864502,-0.0075683594,-0.046447754,-0.019927979,-0.012237549,-0.00008517504,-0.02407837,-0.0023517609,-0.0016212463,0.011726379,0.0069389343,0.003080368,0.010803223,0.005004883,0.0030384064,-0.008377075,0.010299683,-0.019165039,-0.028793335,0.013839722,-0.008331299,-0.05529785,0.000828743,-0.007030487,0.06915283,-0.043914795,0.03692627,-0.013946533,0.01134491,0.052642822,-0.0032444,-0.051330566,0.014862061,0.031951904,0.01889038,0.049957275,0.019577026,-0.031066895,-0.018096924,0.08001709,-0.012588501,-0.0064811707,0.017837524,0.014228821,0.034606934,-0.003004074,-0.062683105,-0.037902832,0.0038032532,-0.033081055,0.02305603,-0.025894165,0.031036377,-0.013244629,0.00868988,-0.018325806,0.0032310486,-0.035186768,0.0019350052,-0.0056915283,0.0050315857,-0.02319336,-0.020309448,0.024673462,0.010421753,-0.013267517,0.0075149536,0.040283203,0.024429321,0.003835678,-0.02670288,-0.032043457,-0.0043640137,-0.0021305084,0.01876831,0.020751953,0.026397705,0.04458618,-0.029769897,0.00039291382,0.020492554,0.024124146,0.029647827,-0.005580902,0.011962891,-0.064697266,-0.04852295,-0.024353027,-0.042022705,0.031036377,0.012924194,-0.0052223206,0.058258057,0.018554688,-0.021209717,-0.03829956,0.018508911,-0.050201416,-0.0044059753,0.040924072,-0.017562866,-0.023849487,0.010971069,-0.0061683655,0.0088272095,0.035003662,0.02192688,0.043151855,0.068603516,0.046783447,0.009162903,0.022720337,-0.0058898926,0.034118652,0.0046806335,-0.033996582,-0.030883789,-0.02204895,0.031311035,-0.023910522,-0.01914978,-0.0690918,0.04434204,0.042236328,0.09667969,0.019760132,0.0030727386,0.03213501,-0.015853882,0.01914978,-0.020019531,-0.021438599,-0.023605347,-0.040161133,0.022003174,-0.013267517,-0.008262634,-0.012298584,0.030136108,-0.00491333,0.019638062,-0.023239136,0.054595947,-0.010528564,-0.015914917,0.014450073,0.0135269165,0.04449463,0.06854248,-0.045043945,0.03250122,0.027038574,-0.03149414,0.0076522827,0.040222168,-0.0068092346,-0.010848999,-0.03955078,-0.024917603,-0.0118255615,-0.008743286,-0.04827881,0.009819031,0.0059776306,0.021728516,0.016052246,-0.010131836,-0.011489868,-0.0038795471,-0.01448822,-0.05029297,0.00548172,-0.030776978,0.0059547424,0.041870117,-0.027053833,-0.004020691,0.0015134811,-0.0013971329,0.0006351471,0.014526367,0.023529053,-0.0022449493,-0.04473877,0.02079773,0.0074691772,0.011634827,0.011642456,0.026412964,0.021453857,0.03817749,0.04827881,0.021347046,-0.011245728,-0.0647583,0.013175964,-0.043029785,-0.00013458729,0.0262146,-0.02519226,0.002122879,-0.012969971,-0.028121948,-0.016815186,0.017990112,-0.031341553,-0.0006804466,0.024597168,-0.008674622,-0.024551392,-0.06402588,-0.026977539,-0.0018386841,0.05557251,0.02180481,0.019882202,-0.059295654,-0.0031318665,0.027008057,0.009048462,0.03010559,-0.01424408,-0.0021972656,-0.014030457,-0.033996582,-0.009918213,-0.023239136,0.023605347,-0.0030498505,-0.012565613,0.017288208,0.004486084,0.026901245,0.0087890625,0.008026123,0.025344849,-0.015266418,-0.007320404,-0.005859375,0.046783447,0.016418457,-0.023956299,-0.05154419,0.03744507,0.006389618,0.033203125,-0.046539307,-0.012504578,-0.01121521,0.0077667236,0.00843811,-0.010940552,-0.007545471,-0.017791748,-0.04849243,-0.062408447,0.045959473,-0.015289307,0.028869629,0.031677246,0.007904053,0.021865845,-0.009895325,-0.006591797,0.015510559,-0.022247314,-0.006313324,-0.019454956,-0.031204224,-0.018493652,-0.018981934,-0.02507019,0.026855469,-0.01977539,0.022598267,0.010948181,-0.02217102,0.027236938,-0.0052261353,-0.00333786,0.015403748,0.0031280518,0.026626587,0.029022217,0.010948181,-0.04385376,0.0134887695,0.0022239685,0.0050086975,-0.0040130615,0.0491333,0.024856567,-0.0036792755,-0.006286621,-0.013595581,-0.027008057,-0.026367188,0.0035476685,0.0031547546,0.010139465,0.0035152435,-0.037872314,0.013313293,0.008911133,-0.037384033,-0.030471802,0.012619019,0.012458801,-0.032562256,0.019561768,0.036895752,0.051086426,-0.021972656,0.00096702576,0.0011024475,0.028381348,0.029129028,0.01612854,-0.0057411194,0.020690918,-0.01398468,0.016723633,-0.0021705627,-0.014289856,0.018203735,0.0077819824,0.027053833,0.01889038,0.0065345764,-0.018997192,-0.03375244,0.0016975403,-0.013175964,-0.025909424,0.02722168,0.016326904,0.032470703,-0.019577026,0.015419006,0.011695862,-0.016174316,-0.016983032,-0.015174866,0.03894043,-0.015403748,-0.012504578,0.0110321045,0.01902771,0.030883789,-0.06021118,-0.007949829,0.0014562607,0.005847931,-0.019638062,-0.046081543,-0.039367676,0.0085372925,0.040008545,0.007671356,0.01739502,0.03086853,0.0039024353,0.019012451,0.029647827,-0.010253906,-0.011917114,-0.007320404,-0.047973633,-0.022521973,-0.015083313,0.0066223145,-0.035308838,0.0154418945,-0.004798889,-0.025939941,0.0030059814,-0.01448822,0.0002863407,-0.015686035,0.0137786865,0.038635254,0.0044517517,0.013389587,-0.014564514,-0.031799316,0.008079529,0.011772156,0.016723633,-0.038391113,0.015213013,-0.015625,-0.005996704,0.0024604797,0.011184692,0.025131226,0.02468872,0.011909485,0.03692627,-0.04119873,0.046905518,-0.033843994,0.011306763,-0.003479004,-0.033325195,-0.013168335,-0.018844604,-0.019699097,0.047607422,-0.02961731,-0.0051078796,-0.03491211,-0.03149414,-0.0090789795,-0.052642822,0.011444092,0.03744507,0.035583496,-0.02331543,-0.00182724,-0.004383087,0.008522034,-0.013916016,0.010406494,-0.023712158,0.027786255,0.025924683,-0.0008072853,-0.035614014,-0.023880005,-0.022735596,-0.0015058517,-0.045410156,-0.046875,-0.017562866,0.006958008,-0.012031555,-0.014289856,-0.030441284,-0.028793335,-0.0001655817,-0.035308838,0.005317688,0.0049552917,0.019012451,-0.0012207031,-0.024353027,-0.010559082,0.010231018,-0.012641907,0.04296875,0.009712219,-0.0024299622,-0.045776367,0.014564514,0.011550903,0.024002075,-0.010093689,-0.021362305,-0.010902405,-0.025939941,-0.052001953,-0.00919342,-0.005519867,-0.023391724,-0.006679535,-0.00026345253,-0.05834961,-0.00548172,-0.020446777,0.007587433,0.023544312,0.0053253174,0.018692017,-0.0018072128,0.019851685,-0.008598328,-0.0051879883,-0.03756714,0.021194458,0.010307312,0.0071525574,0.022857666,0.05227661,0.004901886,-0.028060913,0.014328003,0.0036354065,0.017059326,-0.019165039,0.012718201,-0.01386261,0.010887146,-0.009048462,-0.014793396,-0.04006958,-0.010253906,0.08428955,0.0008649826,-0.01675415,-0.016540527,-0.019729614,0.019836426,0.030212402,-0.027008057,-0.0029830933,-0.021362305,0.02230835,-0.0256958,0.0061035156,0.0075035095,0.023651123,-0.00995636,-0.055267334,-0.027450562,-0.009552002,-0.014083862,-0.059753418,-0.027053833,-0.069885254,0.0038414001,-0.009887695,-0.022994995,-0.0016994476,0.012268066,-0.013748169,-0.081848145,-0.00579834,0.0513916,0.012954712,0.032196045,-0.007095337,0.025558472,0.02760315,-0.035583496,-0.003080368,0.028900146,-0.030548096,-0.018157959,-0.018920898,0.01687622,-0.015975952,-0.013076782,0.007926941,0.009086609,0.011451721,-0.011306763,0.0033721924,-0.017364502,0.022415161,-0.024124146,0.022583008,-0.021713257,-0.010894775,0.03302002,-0.043884277,0.028457642,0.009239197,-0.008529663,0.0023231506,0.03881836,0.045166016,-0.041107178,-0.01725769,0.017852783,0.014152527,0.03643799,-0.019165039,0.046447754,0.009407043,-0.014022827,0.013031006,-0.012184143,-0.018981934,-0.026138306,-0.024658203,0.011795044,-0.0027427673,0.010795593,-0.023147583,0.0002593994,0.012931824,0.007972717,0.011474609,-0.006034851,-0.024856567,-0.020553589,0.00062942505,0.0017852783,0.0029087067,-0.0029468536,0.028045654,0.023345947,0.041900635,0.024734497,-0.022369385,0.0049324036,0.029693604,-0.010314941,0.0040626526,0.027114868,0.0012369156,0.015548706,0.018661499,0.020217896,-0.045562744,-0.02407837,-0.019256592,-0.020767212,-0.0072746277,-0.003622055,-0.017364502,-0.011657715,0.010292053,-0.0011692047,-0.030059814,0.002998352,-0.020614624,-0.03665161,-0.004562378,-0.01828003,0.02722168,0.0046653748,0.0084991455,0.0008740425,-0.00699234,0.037078857,-0.0116119385,-0.022735596,0.03050232,0.03475952,0.012458801,-0.037078857,-0.0014104843,-0.018234253,-0.015380859,0.0047912598,-0.036621094,0.010253906,0.04373169,-0.018447876,-0.003929138,0.006881714,0.02456665,-0.005252838,0.007282257,-0.013946533,0.014587402,-0.00730896,0.042755127,-0.047302246,0.024734497,0.010063171,0.0017347336,-0.0134887695,-0.011123657,-0.028793335,0.014694214,0.005882263,-0.011726379,0.05154419,0.012367249,0.032470703,-0.016555786,-0.024963379,0.0019321442,-0.028152466,-0.020385742,0.018051147,-0.0098724365,0.004299164,0.01512146,-0.023757935,0.03692627,-0.03274536,0.01889038,0.000029683113,0.005088806,0.0038795471,-0.027374268,-0.004207611,-0.011413574,-0.01676941,0.011398315,-0.00032424927,0.04940796,0.026779175,0.02708435,0.04736328,0.015213013,-0.00054359436,-0.0423584,-0.02949524,0.012023926,-0.013015747,0.021224976,-0.02168274,0.057434082,0.03274536,-0.0016002655,0.04196167,0.029281616,0.038208008,0.0037117004,0.005355835,-0.022201538,0.020339966,0.0018072128,0.036499023,-0.007270813,0.032165527,-0.030288696,0.031143188,0.016494751,0.02067566,-0.030349731,0.032562256,0.06604004,0.021865845,-0.0090789795,0.0435791,-0.007980347,-0.0041503906,-0.010131836,-0.024871826,0.05328369,-0.005332947,0.04360962,0.051483154,0.022537231,0.00035095215,0.023406982,-0.02255249,-0.023925781,0.064331055,0.025802612,-0.018432617,-0.009231567,-0.0032958984,0.011833191,-0.045196533,-0.02532959,0.02268982,-0.01322937,0.016937256,-0.0063934326,-0.0019702911,-0.008911133,0.00712204,0.02633667,0.012802124,-0.01109314,0.028045654,0.03540039,-0.00047826767,0.019042969,-0.007144928,0.021102905,-0.02368164,-0.017959595,0.01940918,0.026977539,-0.01210022,-0.0112838745,0.024612427,0.0015621185,0.0385437,0.045654297,-0.025268555,0.007873535,0.037109375,0.0154418945,-0.0015306473,0.04876709,0.03579712,0.017700195,0.043640137,0.025009155,0.038269043,-0.03778076,0.019592285,-0.00008046627,0.0012588501,-0.015838623,-0.0028820038,0.0017538071,-0.017044067,0.01701355,0.0045318604,-0.014022827,0.020401001,0.022003174,-0.0057678223,-0.009681702,-0.0041885376,0.01574707,-0.02305603,-0.0030994415,0.008972168,-0.016433716,0.037902832,0.0135269165,0.026229858,-0.024505615,0.022903442,0.0036468506,-0.01499176,0.0008301735,0.026184082,-0.03353882,0.0062942505,-0.0023517609,0.0068359375,-0.057128906,0.0047416687,0.029800415,-0.012130737,0.022232056,0.013916016,-0.0040397644,-0.007835388,0.0317688,0.013839722,-0.0017118454,-0.012886047,-0.025512695,0.03201294,0.043762207,-0.0005402565,0.002363205,-0.022872925,-0.007835388,0.0060310364,-0.006134033,-0.010765076,-0.004875183,-0.01373291,-0.024307251,0.019348145,0.03652954,0.017471313,0.05380249,-0.021957397,-0.007904053,0.009407043,0.035247803,0.0035896301,-0.0069770813,-0.0017204285,0.0129776,-0.017791748,0.057006836,0.036956787,0.010765076,0.0413208,-0.00063943863,-0.01676941,0.0024223328,-0.010566711,0.024902344,-0.015083313,0.004383087,0.0021038055,0.029724121,-0.016326904,-0.034820557,0.007419586,-0.015975952,-0.02671814,-0.01525116,0.0075798035,0.0035190582,0.025482178,0.039489746,0.024490356,-0.020462036,0.059692383,-0.013824463,0.04901123,0.0020866394,-0.0154418945,0.05038452,0.015090942,0.034423828,0.017364502,0.015266418,-0.030090332,0.024002075,0.030914307,0.02015686,0.015144348,0.00819397,-0.012687683,0.0345459,-0.001420021,0.030532837,-0.010627747,0.003921509,0.020126343,-0.001115799,-0.0077819824,-0.010536194,-0.008224487,0.012580872,0.051330566,-0.03387451,-0.008682251,-0.026412964,-0.011070251,0.026367188,-0.017074585,-0.0023765564,-0.0035934448,-0.015235901,0.020202637,-0.020507812,-0.024124146,0.00982666,0.02305603,-0.05328369,-0.008544922,-0.00019466877,0.015090942,-0.020965576,0.031036377,0.015731812,0.007507324,0.007003784,0.04486084,-0.0079574585,0.031707764,-0.006965637,0.029571533,0.0256958,0.0022296906,-0.02609253,-0.0022716522,0.0040130615,-0.01197052,0.013267517,0.03881836,-0.019104004,0.0048446655,-0.011978149,-0.002784729,-0.00381279,0.012886047,-0.0137786865,0.006881714,-0.016738892,-0.016998291,0.0051002502,0.0053100586,-0.0051879883,-0.000018060207,0.0035762787,-0.015403748,0.013320923,0.033843994,0.012039185,-0.040252686,-0.010528564,0.006580353,0.007270813,-0.023223877,-0.01737976,-0.0035514832,-0.03543091,0.01676941,0.007209778,0.020568848,0.014808655,-0.031066895,0.0022010803,0.025405884,0.010810852,0.019180298,0.00919342,-0.0047073364,0.016571045,-0.008140564,-0.003686905,-0.0038452148,-0.008682251,0.017150879,0.018692017,-0.0049209595,-0.029510498,0.020339966,-0.011657715,0.021469116,0.0010585785,-0.01687622,0.014732361,-0.007507324,0.0020523071,0.0004324913,0.012557983,-0.013374329,-0.0101623535,-0.010467529,0.039001465,0.05505371,-0.017807007,-0.010108948,0.022735596,0.018310547,0.019866943,0.035125732,0.0032634735,0.044799805,0.027786255,-0.014541626,-0.021072388,0.028427124,-0.016601562,-0.024887085,0.017089844,-0.018432617,-0.017837524,0.016098022,0.018127441,0.0041236877,-0.031143188,-0.009399414,-0.015548706,-0.017303467,0.013839722,-0.020843506,0.0128479,-0.028167725,-0.02116394,0.011276245,-0.02571106,-0.04321289,-0.01828003,-0.010482788,-0.012802124,-0.054473877,0.0067825317,-0.026824951,0.009284973,-0.03302002,-0.0037155151,-0.009590149,0.01008606,-0.010803223,-0.015670776,0.009994507,0.024414062,0.02607727,0.0057258606,0.024871826,-0.031677246,-0.016479492,-0.02923584,0.0096588135,-0.012184143,0.022125244,0.000685215,0.03149414,0.026641846,-0.012046814,-0.003376007,-0.008148193,-0.003730774,-0.019363403,-0.018218994,-0.02659607,0.025146484,0.011398315,-0.0093307495,-0.011184692,0.048461914,-0.028060913,-0.024047852,0.03173828,0.037597656,0.008544922,0.029083252,-0.020263672,-0.0051116943,-0.009063721,-0.0021038055,-0.013038635,0.0036735535,0.0048294067,0.01071167,-0.008255005,0.0066871643,0.024642944,-0.01651001,0.002275467,0.035308838,0.0019226074,-0.006587982,0.03930664,0.00705719,0.0074043274,-0.015144348,-0.0101623535,0.01890564,0.04660034,0.007865906,0.0031375885,-0.009979248,0.0006380081,-0.015510559,0.011100769,0.015045166,-0.015235901,-0.04449463,-0.016555786,-0.031402588,0.020446777,-0.003534317,0.009284973,-0.010368347,0.018127441,-0.017196655,-0.02432251,-0.02746582,0.031921387,0.008644104,-0.013725281,-0.012214661,0.0154953,0.014862061,-0.040802002,0.00010287762,-0.04611206,-0.034576416,-0.0039634705,-0.021774292,0.029510498,0.011375427,-0.0044288635,-0.007507324,-0.005680084,-0.0032138824,0.0029964447,0.024414062,-0.0154800415,-0.0073013306,0.037017822,0.017807007,-0.023956299,0.032562256,-0.014503479,0.0053977966,0.01309967,-0.012825012,0.013893127,-0.023345947,0.026779175,-0.014564514,-0.0073776245,0.028411865,-0.010253906,0.010353088,-0.04244995,-0.0022220612,0.002439499,-0.002735138,0.042510986,-0.02961731,-0.026351929,0.007293701,-0.024520874,-0.024978638,0.004322052,0.013244629,0.028060913,-0.0039520264,0.047821045,-0.01474762,-0.010971069,0.022994995,0.013839722,-0.013618469,0.002588272,0.027420044,0.0022697449,0.0010051727,-0.0019207001,-0.019515991,-0.025360107,-0.0065994263,0.020843506,-0.008636475,-0.00957489,0.03591919,0.016860962,0.047912598,-0.003358841,0.024398804,0.009460449,0.008705139,0.029510498,0.0042037964,0.053497314,-0.005683899,-0.024749756,0.0038089752,0.00919342,-0.025863647,0.012619019,-0.007095337,0.0039901733,-0.04019165,0.014045715,0.0005841255,0.027236938,-0.019607544,0.0138549805,-0.02381897,-0.013557434,-0.038391113,-0.008255005,-0.027786255,0.0041503906,0.028747559,0.00667572,0.029006958,-0.0040016174,-0.024246216,0.014862061,0.045959473,-0.012298584,-0.02180481,-0.016616821,0.0075531006,0.0026359558,0.013504028,0.0071029663,-0.020767212,-0.010040283,0.0061035156,-0.015419006,0.0043029785,-0.0079956055,0.01373291,0.0045051575,-0.0020160675,-0.015014648,0.027862549,-0.0070495605,-0.008575439,0.008720398,0.005126953,0.032196045,0.030029297,-0.011779785,0.016998291,0.02116394,-0.04824829,0.05847168,0.0068740845,0.02357483,-0.01890564,0.0029640198,-0.034698486,-0.021972656,-0.021560669,0.004600525],"createdAt":"2026-04-18T18:58:47.926Z","updatedAt":"2026-04-23T20:33:06.548Z","lastSeenAt":"2026-04-23T20:33:06.548Z","tsv":"'/api/v1/transactions/146':56,160 '/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66,201 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,169 'actual':210 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,168,183 'attach':93 'base':8,23,51,75 'behind':159 'beyond':164 'broader':106 'call':4,19,82 'caller':91 'captur':203 'categori':111 'challeng':67,202 'classif':127 'confirm':199 'connect':189 'content':195 'convers':144 'crypto-paid API' 'data':113,117,206 'doc':180 'document':163 'embed':128 'endpoint':55,147,197 'estim':138 'exampl':177 '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 'insight':119 'key':85 'label':166 'learn':122 'limit':88 'list':58 'live':200 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'openapi':173 'page':184 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103,214 'per':3,18,36,81,153 'platform':6,21,39,107 'premium':60,167 'price':131,150,181 'prompt':191 'proof':104 'protocol':44 'quot':136 'rate':87,134 'render':186 'report':116 'request':37,154 'request/response':176 'requir':68,90 'return':64,211 'schema':174 'sentiment':123 'servic':208 'simpli':92 'specif':54,157 'success':213 'summar':126 'text':125 'token':135 'uniform':149 'unit':76 'unknown':216 'upon':212 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':190 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"24f08110-3167-47bf-b692-8a8ce3b7a803","listingId":"a788dce2-e286-470a-a3cb-6b87904cf722","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/transactions/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:47.926Z"}],"sources":[{"listingId":"a788dce2-e286-470a-a3cb-6b87904cf722","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:47.926Z","lastSeenAt":"2026-04-23T20:33:06.548Z"}],"details":{"listingId":"a788dce2-e286-470a-a3cb-6b87904cf722","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/146 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/transactions/146"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/146"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Low-volume, on-demand API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.069Z"},"updatedAt":"2026-04-23T20:33:06.548Z"}}