{"id":"7804b832-623b-4659-b657-95fe19c459ac","shortId":"ME5EP7","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/144/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0.02 USD per request) settled to a specified wallet address.\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 — payment is handled entirely via the x402 protocol on Base.\n\nDocumentation 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 schema, no request/response examples, and no explanation of what the account balance endpoint actually returns or what input it expects beyond an HTTP POST. The endpoint's purpose — whether it returns a crypto wallet balance, a platform account balance, or something else — is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","account-balance","http-post"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-request API","crypto payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","Purpose of the /api/v1/accounts/144/balance endpoint is unclear — no description of what 'balance' refers to","The hardcoded account ID '144' in the path suggests this may be a single-account resource, not a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/144/balance","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/accounts/144/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually returns. 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":"2026-04-19T01:20:10.074Z","embedding":[-0.015960693,0.0011663437,0.040496826,0.018493652,0.015602112,-0.037322998,-0.0026302338,0.008720398,0.0826416,-0.06878662,0.0340271,-0.072509766,-0.044677734,-0.031982422,-0.011779785,0.017471313,-0.028839111,0.029251099,-0.05630493,0.035095215,0.0062294006,-0.0231781,-0.009819031,0.04660034,-0.022705078,-0.02456665,-0.008148193,-0.027999878,-0.037841797,-0.033111572,0.05404663,-0.020736694,-0.0040283203,0.014907837,0.016067505,0.014450073,0.006713867,0.029510498,0.047973633,-0.016586304,-0.020507812,-0.04815674,-0.0017385483,0.005180359,-0.024749756,0.00969696,0.018539429,-0.01637268,0.013412476,-0.008903503,-0.05142212,0.012420654,0.023880005,0.015174866,0.0072288513,0.027435303,-0.012397766,-0.023757935,0.017562866,0.03717041,-0.0012111664,-0.057800293,-0.009017944,-0.0013856888,0.00630188,0.050994873,0.00063562393,0.04437256,-0.0068855286,0.057037354,0.023025513,0.066711426,0.036499023,0.00061941147,0.008514404,-0.030258179,0.012809753,0.033203125,-0.021575928,-0.048828125,-0.00774765,-0.021774292,-0.09069824,-0.008056641,-0.010726929,-0.048736572,-0.01651001,0.009681702,-0.031021118,0.049224854,-0.08300781,-0.01838684,0.012359619,0.026306152,0.0121536255,-0.031982422,-0.0033721924,0.026168823,-0.00027656555,0.0026874542,0.0025634766,-0.017684937,0.03564453,-0.020645142,0.052459717,0.038635254,0.010528564,0.008262634,-0.0041999817,0.003320694,-0.03842163,-0.0032234192,-0.0050354004,-0.037963867,0.0061187744,0.014755249,-0.033233643,0.0035934448,-0.020263672,0.015571594,-0.036193848,0.07885742,0.014968872,0.0008749962,0.026855469,-0.05609131,-0.020492554,0.01612854,-0.038146973,0.0090789795,0.034942627,-0.0010595322,0.009498596,-0.020050049,-0.041046143,0.017318726,-0.022735596,-0.020263672,-0.041625977,-0.00073719025,0.031341553,-0.024902344,0.014808655,-0.00013101101,-0.09185791,0.00034856796,-0.037750244,0.010971069,-0.03012085,-0.0077819824,0.013847351,0.00605011,-0.011047363,-0.0126953125,-0.019973755,-0.01939392,-0.0037631989,0.027130127,0.006614685,0.05404663,0.009994507,0.033813477,0.04675293,0.0052223206,0.02470398,0.028564453,-0.01876831,-0.06585693,-0.07562256,-0.019058228,0.004432678,-0.029464722,-0.030075073,0.004508972,-0.021774292,-0.06341553,-0.0031471252,-0.003118515,-0.033050537,-0.021072388,0.009460449,-0.017105103,0.013168335,-0.011314392,-0.061431885,-0.01600647,-0.0015306473,0.061431885,0.024230957,0.02268982,0.0054626465,0.023849487,0.05090332,0.03945923,-0.01676941,-0.022201538,0.0105896,-0.0049934387,0.022460938,0.001036644,0.019989014,-0.01713562,0.030197144,0.04006958,-0.018127441,-0.02192688,0.023391724,-0.05029297,-0.053527832,-0.019134521,0.014259338,0.0052261353,-0.011360168,0.0112838745,-0.042114258,-0.011627197,0.0069618225,0.026931763,-0.0022945404,0.06774902,0.008300781,0.008148193,0.024093628,0.023086548,-0.056762695,0.038024902,0.046936035,0.019866943,-0.0072250366,-0.028030396,0.023361206,0.026184082,-0.017578125,-0.0015573502,-0.000042319298,0.017044067,0.0020389557,0.008476257,0.028076172,-0.010353088,-0.007896423,-0.0128479,-0.00074338913,0.012031555,0.008903503,-0.007171631,-0.03829956,-0.086364746,0.055633545,0.051818848,0.020355225,0.0036697388,-0.0028800964,-0.02168274,-0.028305054,-0.057495117,0.042388916,0.054260254,-0.007537842,-0.034851074,0.026763916,-0.020721436,-0.025619507,-0.028411865,-0.015670776,-0.015136719,-0.019882202,-0.010879517,-0.083618164,0.020980835,0.017822266,0.029388428,0.041503906,0.008491516,-0.051849365,-0.02017212,0.00008815527,0.004219055,-0.029251099,-0.0037174225,-0.017044067,0.016784668,0.02671814,0.0043792725,0.017105103,-0.0027008057,-0.020263672,-0.006149292,0.029891968,0.0054016113,-0.017944336,0.035827637,0.0104599,-0.043640137,0.022003174,0.015449524,0.052978516,-0.04647827,0.03375244,-0.015151978,-0.0021743774,0.046020508,-0.009109497,-0.053375244,0.022567749,-0.004928589,0.055786133,0.061950684,0.016921997,-0.0042037964,-0.013168335,0.05783081,-0.011665344,-0.00016129017,0.017120361,0.02935791,0.030197144,-0.008796692,-0.076538086,-0.0491333,-0.0023403168,-0.03427124,0.021011353,-0.018051147,0.0178833,0.007980347,0.014099121,-0.021881104,0.00043034554,-0.043884277,-0.0021133423,-0.015670776,0.01701355,-0.025741577,-0.022567749,0.026931763,0.022323608,0.0036792755,-0.005847931,0.04788208,0.02406311,-0.025405884,-0.005001068,-0.028686523,-0.015670776,-0.028518677,0.026489258,0.0068473816,0.018493652,0.026016235,-0.02709961,0.0010719299,0.031280518,-0.0008735657,0.043701172,0.0059013367,-0.005973816,-0.06359863,-0.044158936,-0.019989014,-0.041015625,0.010864258,0.025161743,-0.009567261,0.055267334,-0.010108948,-0.009559631,-0.036895752,0.03387451,-0.037841797,0.009490967,0.028030396,-0.03488159,-0.027954102,-0.0109939575,0.009567261,0.021347046,0.029067993,0.015930176,0.031051636,0.08380127,0.037628174,0.013412476,-0.0017166138,0.031173706,0.036102295,-0.01020813,0.009140015,-0.02532959,-0.018539429,0.027633667,-0.027542114,-0.02279663,-0.075805664,0.057373047,0.01209259,0.08331299,0.009384155,0.0046920776,0.019577026,-0.011558533,0.021972656,-0.05682373,-0.041259766,-0.036590576,-0.03753662,0.027175903,-0.012390137,0.011184692,-0.025848389,0.028762817,0.0036087036,0.018127441,-0.039916992,0.04989624,-0.00819397,-0.022445679,0.020736694,0.023620605,0.042663574,0.055633545,-0.031951904,0.010528564,0.009300232,-0.027511597,-0.0035514832,0.027236938,-0.006374359,-0.01828003,-0.062561035,-0.007434845,0.014091492,-0.01890564,-0.06518555,-0.008621216,0.0035247803,0.02822876,0.02708435,-0.021530151,-0.023849487,0.0003452301,-0.01083374,-0.08087158,0.00031638145,-0.024658203,0.017196655,0.022583008,-0.03314209,0.020141602,0.0006251335,0.015281677,-0.007423401,0.027282715,0.0040512085,0.003932953,-0.018661499,0.0357666,0.011352539,0.018096924,0.012619019,0.05670166,0.027923584,0.018615723,0.045074463,0.028518677,0.0031375885,-0.051818848,0.016815186,-0.06173706,0.016540527,0.037597656,-0.038269043,0.007881165,-0.0024986267,-0.038482666,-0.005241394,0.014457703,-0.022232056,0.002588272,0.027023315,-0.032104492,-0.036590576,-0.04888916,-0.019638062,0.0021095276,0.07312012,-0.00050115585,0.01473999,-0.03125,-0.0076408386,0.027160645,0.009651184,0.010887146,-0.014015198,-0.010772705,-0.041534424,-0.009460449,-0.029022217,-0.004688263,0.02973938,-0.0023670197,-0.013618469,0.011878967,0.0038490295,0.008781433,-0.00920105,0.0040359497,0.015205383,-0.022354126,0.012313843,0.0013713837,0.028915405,-0.005760193,-0.037200928,-0.05041504,0.035461426,0.004737854,0.03161621,-0.03466797,0.0035057068,0.0069236755,0.013923645,0.006149292,-0.02230835,-0.0010509491,0.0096588135,-0.023498535,-0.08276367,0.044158936,-0.02154541,0.024017334,0.010643005,-0.002632141,0.03149414,-0.0075187683,0.024536133,0.012313843,-0.033233643,-0.0076408386,-0.033843994,-0.019622803,-0.026031494,0.0022068024,-0.013717651,0.021560669,-0.009719849,0.01889038,-0.011665344,-0.023208618,0.029464722,-0.0054092407,-0.0056915283,0.017913818,-0.00856781,0.008346558,0.047851562,0.018157959,-0.05593872,0.04071045,0.0037326813,-0.0023975372,-0.013542175,0.0541687,0.019805908,-0.010185242,0.003435135,-0.01977539,0.002363205,-0.020950317,-0.008522034,0.0051193237,0.042053223,0.019470215,-0.047790527,0.01424408,0.017608643,-0.029891968,-0.018356323,0.018569946,0.018936157,-0.048309326,0.00548172,0.009475708,0.02835083,-0.03668213,0.0054893494,0.003944397,0.03387451,0.022781372,0.017181396,0.0049705505,0.009666443,-0.022781372,0.013000488,-0.00007170439,-0.022888184,-0.024429321,-0.0051460266,0.030914307,0.011398315,0.00086545944,-0.0016031265,-0.017486572,-0.010604858,0.003704071,-0.018844604,0.02859497,0.010093689,0.017089844,-0.010238647,0.008415222,0.037994385,-0.037719727,-0.008010864,0.013031006,0.037322998,-0.0050315857,-0.010238647,0.038482666,0.007282257,0.035308838,-0.040405273,-0.01713562,-0.007926941,0.010597229,-0.014228821,-0.064086914,-0.030380249,-0.017562866,0.027023315,-0.013320923,0.00919342,0.029586792,-0.0015544891,-0.0013475418,0.009376526,0.01966858,-0.017532349,0.0018634796,-0.059326172,-0.007827759,-0.014228821,-0.012130737,-0.033233643,0.017868042,-0.03894043,-0.029388428,0.0053253174,-0.017486572,0.0072631836,0.00655365,-0.0061531067,0.039398193,-0.011566162,0.008506775,-0.006298065,-0.026489258,-0.006668091,0.0006942749,0.022720337,-0.06021118,0.016296387,-0.011917114,-0.0013742447,-0.013092041,-0.009147644,0.025894165,0.015609741,0.014656067,0.03466797,-0.052459717,0.04046631,-0.034179688,-0.00046753883,-0.0007505417,-0.010513306,-0.0055236816,-0.024780273,-0.014663696,0.03967285,-0.0048065186,-0.0031032562,-0.023742676,-0.038604736,-0.024291992,-0.051330566,0.029586792,0.016571045,0.052001953,-0.024810791,-0.011222839,0.010002136,0.020217896,-0.0030231476,-0.01966858,-0.0019664764,0.02027893,0.016860962,0.0063552856,-0.023040771,-0.02229309,-0.023483276,-0.0035533905,-0.0473938,-0.051330566,-0.010566711,0.016708374,0.012588501,-0.028259277,-0.032806396,-0.021697998,-0.0003414154,-0.022491455,0.004425049,-0.010803223,0.016189575,-0.0062789917,-0.020385742,0.013298035,0.00081682205,-0.032440186,0.0368042,0.0118255615,-0.013168335,-0.019165039,-0.0021820068,0.012840271,-0.010475159,-0.008918762,-0.02708435,-0.014755249,-0.016418457,-0.053588867,0.0143585205,-0.011276245,0.01411438,-0.015853882,-0.005996704,-0.037597656,-0.012275696,-0.015930176,-0.0054855347,-0.0009160042,0.013183594,0.009178162,0.0050697327,0.009986877,-0.0038414001,-0.012710571,-0.018600464,0.0051002502,0.009780884,-0.008232117,0.018844604,0.04348755,0.0007042885,-0.028564453,0.0028362274,0.0036087036,0.018310547,-0.02041626,0.00066280365,-0.0026721954,0.02319336,-0.013626099,-0.013618469,-0.041229248,0.008613586,0.06213379,-0.00712204,-0.0022277832,-0.02041626,-0.005630493,0.025146484,0.035247803,-0.03579712,0.017715454,-0.036254883,0.015266418,-0.02935791,0.025253296,0.000007033348,0.037841797,-0.014305115,-0.041870117,0.0034770966,0.03161621,-0.012275696,-0.066101074,-0.01676941,-0.078063965,-0.002696991,-0.02279663,-0.024337769,0.0055351257,0.005264282,-0.027999878,-0.06542969,0.0023117065,0.04626465,0.010818481,0.022155762,0.0021533966,0.0077934265,0.022750854,-0.010971069,-0.023803711,0.0069236755,-0.022964478,-0.005519867,-0.02633667,0.028747559,-0.016616821,-0.016326904,0.0071983337,-0.0040512085,0.016555786,-0.010025024,0.012023926,-0.011688232,0.002872467,-0.0059318542,0.00087976456,-0.0051116943,-0.012687683,0.035827637,-0.051971436,0.026947021,0.00623703,0.0118255615,0.010696411,0.0143966675,0.02861023,-0.040252686,0.0006489754,0.0073127747,0.011497498,0.030685425,-0.02017212,0.04638672,0.0096588135,0.0014047623,0.0052261353,-0.026260376,0.012535095,-0.039276123,-0.021072388,0.02470398,-0.0064849854,0.0069351196,-0.024261475,-0.0068130493,0.007949829,-0.0045204163,-0.0036125183,-0.00806427,0.0037174225,-0.024780273,0.021835327,-0.0063552856,0.036193848,0.0022125244,0.019470215,0.03765869,0.04434204,0.008033752,0.0032672882,0.000726223,0.02230835,-0.018112183,-0.002090454,0.019515991,0.030349731,0.0093307495,0.018005371,0.014060974,-0.03213501,-0.031341553,-0.006614685,-0.028717041,0.015449524,-0.024993896,0.010398865,0.00655365,0.01159668,-0.02319336,-0.026672363,-0.0020885468,-0.01991272,-0.0152282715,-0.012565613,0.009590149,0.015670776,0.014656067,-0.004295349,0.0033721924,-0.0075950623,0.038085938,-0.007762909,-0.015167236,0.009841919,0.046173096,0.008270264,-0.028533936,-0.0025501251,-0.013397217,-0.00819397,0.0023231506,-0.0077667236,0.026672363,0.020935059,-0.016662598,0.020690918,0.0014696121,0.05670166,-0.0055618286,0.008338928,0.0038394928,0.013282776,0.016494751,0.040252686,-0.043273926,0.012245178,0.007858276,-0.016860962,-0.00006407499,-0.016860962,-0.011947632,0.011375427,0.009223938,-0.011528015,0.029663086,0.016082764,0.014533997,-0.03579712,-0.01713562,0.007045746,-0.04031372,-0.0340271,0.0052833557,-0.010406494,-0.011428833,0.012306213,-0.02357483,0.0030994415,-0.014411926,0.014572144,0.003791809,0.014602661,-0.01386261,-0.029403687,-0.0016555786,-0.015731812,-0.01979065,0.0051612854,-0.0025596619,0.054473877,0.024902344,0.021652222,0.02671814,0.03475952,0.004966736,-0.044158936,-0.019165039,0.013870239,-0.0002541542,0.00687027,-0.029144287,0.049102783,0.060760498,0.0043144226,0.03213501,0.048614502,0.045776367,-0.0058135986,0.0084991455,-0.0037822723,0.02116394,-0.018417358,0.023406982,-0.010116577,0.027282715,-0.01725769,0.021697998,-0.0034542084,0.027404785,-0.025970459,0.021652222,0.06414795,0.017990112,-0.013999939,0.019226074,-0.017654419,-0.0127334595,-0.013580322,-0.019805908,0.05130005,-0.0006375313,0.03842163,0.035461426,0.011756897,-0.026977539,0.0231781,-0.0026836395,-0.026535034,0.057739258,0.0044517517,-0.012619019,-0.005104065,-0.004878998,0.020462036,-0.045837402,-0.022628784,0.032714844,-0.019241333,0.0025920868,-0.005958557,0.0021915436,-0.00030112267,0.006401062,-0.0061912537,0.028427124,-0.026611328,-0.0032463074,0.015098572,0.0057373047,0.019073486,0.002363205,0.036315918,-0.015777588,-0.02218628,0.0047836304,0.015960693,0.019073486,-0.011360168,0.03274536,0.020858765,0.03778076,0.034088135,-0.018753052,0.0056037903,0.032287598,0.0066490173,-0.007255554,0.053588867,0.015853882,0.029785156,0.04345703,0.032836914,0.033691406,-0.015838623,0.025619507,0.004550934,-0.0044555664,-0.013626099,0.0043945312,0.02067566,-0.011367798,0.03164673,0.0002696514,0.0026416779,0.015457153,0.03164673,-0.015899658,-0.002325058,0.0018634796,0.0044021606,-0.009719849,-0.009552002,0.012214661,-0.018554688,0.006706238,0.020904541,0.018218994,-0.04055786,0.013580322,0.00037550926,-0.023742676,-0.012870789,0.013511658,-0.03894043,0.009757996,0.0022068024,-0.016357422,-0.030349731,0.016616821,0.0032958984,-0.012931824,0.03414917,0.012016296,0.0039749146,0.007762909,0.019744873,0.029464722,0.006378174,0.0012655258,-0.005760193,0.0045700073,0.030334473,-0.015090942,-0.010955811,-0.03186035,-0.00026583672,0.027435303,-0.011192322,-0.021392822,0.0062179565,-0.013580322,-0.020019531,0.0049591064,0.04119873,0.012626648,0.039978027,-0.02645874,-0.009315491,0.0020961761,0.037200928,0.005279541,-0.023620605,-0.020935059,0.015899658,-0.025177002,0.043395996,0.051940918,-0.004272461,0.0065574646,0.0071792603,-0.018356323,-0.0076065063,-0.01663208,0.019683838,-0.027008057,0.017837524,0.012939453,0.021759033,-0.032073975,-0.021713257,-0.0056877136,-0.027252197,-0.026382446,-0.020248413,0.00957489,0.0013008118,0.031799316,0.011795044,0.0345459,-0.01373291,0.057647705,-0.006793976,0.061584473,0.007762909,-0.009376526,0.04647827,0.01828003,0.018127441,0.010848999,0.020904541,-0.029815674,0.0011081696,0.014053345,0.007358551,0.005542755,0.003921509,-0.006839752,0.04345703,-0.028717041,0.028121948,-0.0039787292,-0.0012636185,0.019882202,-0.020401001,-0.026443481,-0.0067367554,-0.008705139,0.0014009476,0.04244995,-0.010177612,-0.0143585205,-0.020248413,-0.020370483,0.022994995,-0.011993408,0.005935669,-0.0037117004,-0.010749817,0.019973755,-0.021774292,-0.014533997,0.0033874512,0.025497437,-0.04147339,-0.0074043274,0.003660202,0.024124146,-0.021438599,0.03765869,0.03729248,0.0030403137,-0.007537842,0.04989624,-0.005973816,0.02709961,0.0032615662,0.055114746,0.038269043,0.011047363,-0.0074806213,0.021224976,0.027633667,-0.006942749,0.010757446,0.04937744,0.0011777878,0.01576233,-0.011245728,-0.013809204,0.006336212,-0.004295349,-0.017547607,-0.0034751892,-0.025619507,-0.010009766,0.0027160645,0.007736206,-0.001917839,0.013282776,-0.014549255,-0.015609741,0.007827759,0.032592773,0.020996094,-0.050994873,-0.0008420944,0.01398468,0.016052246,-0.023361206,-0.022384644,0.0034427643,-0.04437256,-0.00038981438,0.028198242,-0.0016002655,-0.003917694,-0.024261475,0.005958557,0.050079346,0.0151901245,0.010940552,0.017852783,-0.015701294,0.022567749,-0.0050811768,-0.00049209595,0.005771637,-0.015731812,0.0024528503,0.025024414,0.000009775162,-0.014419556,0.010719299,0.0115356445,0.015487671,0.005241394,0.01398468,0.025848389,-0.014663696,-0.00035262108,0.005760193,0.015808105,-0.027130127,-0.04336548,-0.009391785,0.026306152,0.04852295,-0.016540527,-0.0023441315,-0.020904541,0.034179688,0.03012085,0.040252686,0.00072288513,0.047424316,0.016403198,0.0018281937,-0.024734497,0.020889282,0.0003335476,-0.021850586,0.019073486,-0.0262146,-0.005897522,-0.0026779175,0.021850586,0.010986328,-0.013450623,-0.008300781,-0.021484375,-0.009674072,0.021636963,-0.023101807,0.017501831,-0.03488159,-0.01360321,0.01713562,-0.0035247803,-0.02154541,-0.03289795,-0.021026611,-0.011711121,-0.06817627,0.010803223,-0.021194458,-0.01133728,-0.029144287,0.0037117004,-0.016021729,0.021591187,-0.0003774166,-0.012321472,0.0025405884,0.023834229,0.015075684,-0.0055160522,0.031402588,-0.028900146,-0.012893677,-0.0043907166,-0.014778137,-0.0038261414,0.037872314,-0.021697998,0.03527832,0.0036029816,-0.014266968,0.0008454323,-0.013130188,-0.017227173,0.0058403015,-0.034057617,-0.023727417,0.014305115,0.018417358,0.00086927414,0.008491516,0.03967285,-0.026260376,-0.020751953,0.036895752,0.050048828,-0.001663208,0.059417725,-0.029693604,0.007019043,-0.034179688,-0.005680084,-0.0029716492,0.015975952,0.0096206665,0.01965332,0.008010864,0.028671265,0.02053833,-0.015205383,-0.014076233,0.034362793,0.021774292,-0.009101868,0.04284668,0.011497498,0.008651733,-0.024490356,-0.008720398,0.00040841103,0.04168701,0.01096344,0.0146102905,-0.021347046,0.0038223267,-0.012763977,0.009552002,0.039215088,-0.02772522,-0.040649414,-0.008262634,-0.024871826,0.011131287,-0.004924774,0.00932312,-0.015098572,0.0109939575,-0.035461426,-0.031829834,-0.025024414,0.017501831,0.007347107,-0.008232117,-0.002626419,0.0014734268,-0.003660202,-0.032287598,-0.0043754578,-0.05795288,-0.028259277,0.0007133484,-0.0129470825,0.016616821,0.008331299,-0.010688782,0.007724762,0.0025310516,-0.002111435,0.004131317,0.023101807,-0.0048294067,0.004737854,0.02748108,0.020843506,-0.008102417,-0.00069999695,-0.015403748,0.0019874573,0.034179688,-0.0049095154,0.008796692,-0.00034213066,0.015090942,0.017730713,0.0079956055,0.025177002,-0.014152527,0.030014038,-0.038513184,-0.011329651,-0.0018463135,-0.01763916,0.035980225,-0.014297485,-0.03010559,-0.012023926,-0.0064926147,-0.022415161,0.011161804,0.01146698,0.039154053,-0.009033203,0.04550171,-0.016464233,-0.021469116,0.013870239,0.007896423,-0.008216858,0.0024642944,0.019515991,0.0047683716,0.031433105,0.0038967133,0.003320694,-0.016067505,-0.009254456,-0.002046585,-0.012634277,-0.007865906,-0.0008254051,0.014793396,0.027435303,0.011505127,0.013130188,0.027359009,0.013618469,0.03173828,0.014450073,0.043548584,0.023391724,-0.024612427,0.008880615,0.01574707,-0.013664246,-0.0011968613,-0.005203247,0.014175415,-0.026046753,-0.00617218,-0.009254456,0.035247803,-0.012191772,0.016036987,-0.009597778,-0.009094238,-0.058563232,-0.0057144165,-0.0413208,0.005126953,0.014984131,0.006111145,0.021408081,0.009780884,-0.031143188,0.0053710938,0.016067505,0.0025119781,-0.03326416,-0.013542175,0.00052165985,0.006439209,0.006500244,0.019165039,-0.03894043,-0.020767212,0.00059843063,0.005756378,-0.001950264,-0.024368286,0.023452759,0.028640747,-0.013771057,-0.019851685,0.024490356,0.008155823,-0.00724411,0.013832092,0.0071792603,0.03665161,0.039001465,-0.00014650822,0.028335571,0.013542175,-0.03640747,0.06097412,-0.016830444,0.028274536,-0.017471313,-0.018539429,-0.024398804,-0.010635376,-0.0045280457,-0.00081443787],"createdAt":"2026-04-18T18:41:06.006Z","updatedAt":"2026-04-27T20:34:32.163Z","lastSeenAt":"2026-04-27T20:34:32.163Z","tsv":"'/api/v1/accounts/144/balance':46 '0.02':83,137 '000':78 '20':77 'Base network API' 'USDC micropayment API' 'accept':69 'account':4,18,35,197,224 'account balance API' 'account-balance' 'actual':200 'address':92 'advertis':97 'ai/ml':109 'analysi':111 'analyt':108 'api':105,142,166 'balanc':5,19,36,198,221,225 'base':8,22,58,79,159 'behind':49 'beyond':207 'broader':94 'call':12,26,104 'challeng':62 'classif':113 'commit':149 'confirm':63 'connect':175 'convers':130 'crypto':219 'crypto payment API' 'data':107 'detail':182 'doc':165 'document':160,231 'els':228 'embed':114 'endpoint':6,20,30,65,133,199,212 'entir':153 'estim':124 'exact':71 'exact-schem':70 'exampl':190 'exchang':119 'expect':206 'explan':193 'extrem':162 'feed':118 'financ':115 'gas':123 'gate':3,17,48 'generat':131 'geocod':128 'handl':152 'http':209 'http-post' 'infrastructur':126 'input':204 'key':143 'limit':146 'list':135 'live':67 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,95 'network':59 'openapi':186 'page':170 'pay':10,24,102 'pay-per-cal':9,23,101 'pay-per-call' 'pay-per-request API' 'payment':41,55,73,150 'per':11,25,52,85,103,138 'per-request':51 'platform':96,223 'post':210 'price':117,167 'prompt':177 'protocol':42,157 'provid':33 'purpos':214 'quot':122 'rate':120,145 'readm':169 'render':172 'request':53,86,139 'request/response':189 'resourc':45 'return':201,217 'schema':187 'scheme':72 'sentiment':110 'settl':87 'someth':227 'span':106 'spars':163 'specif':44 'specifi':90 'suit':99 'summar':112 'technic':181 'token':121 'unit':80 'usd':84 'usdc':14,28,54,82 'usdc-base' 'util':127 'valid':129 'via':38,154 'wallet':91,176,220 'web3':116 'whether':215 'x402':2,16,40,61,156 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b094d62a-7a36-41cb-b4de-c1489627e10f","listingId":"7804b832-623b-4659-b657-95fe19c459ac","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/accounts/144/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:06.006Z"}],"sources":[{"listingId":"7804b832-623b-4659-b657-95fe19c459ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/144/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:06.006Z","lastSeenAt":"2026-04-27T20:34:32.163Z"}],"details":{"listingId":"7804b832-623b-4659-b657-95fe19c459ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/144/balance\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with a valid x402 payment token to access the resource.","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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/144/balance"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying an account balance via a pay-per-call model without API keys","Integrating x402-gated endpoints into agent workflows on Base","Demonstrating x402 protocol payment flows for USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, per-request API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or support","High-volume use cases where per-call pricing may not be optimal"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.117Z"},"updatedAt":"2026-04-27T20:34:32.163Z"}}