{"id":"1cb3e9b0-9208-48d4-aaed-15368b2dae98","shortId":"QSZjhR","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/cards/100` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe provider's landing page lists four categories of endpoints: 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 are priced uniformly at $0.02 per request.\n\nThe platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 payment header using USDC on the Base L2 network. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed endpoint descriptions available beyond the landing page summary.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","cheap api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/cards/100 ('Premium API Access') is not documented anywhere","No OpenAPI spec or request/response schema provided","Cannot verify what data or functionality any of the listed endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/100","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/cards/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation beyond the landing page. No request/response schemas, no examples, no OpenAPI spec. All doc pages return only 'Connect wallet'. The specific purpose of /api/v1/cards/100 is unclear — it could be anything. 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":"2026-04-19T02:45:17.065Z","embedding":[-0.024353027,-0.036346436,0.04840088,0.0056037903,0.0151901245,-0.023742676,-0.026519775,0.025177002,0.06341553,-0.06329346,0.038360596,-0.074035645,-0.0357666,-0.030914307,-0.015853882,0.0059165955,-0.009048462,-0.0038928986,-0.040985107,0.03378296,0.024261475,-0.010971069,-0.015174866,0.025909424,-0.00843811,-0.009994507,0.011672974,-0.0043563843,-0.004837036,-0.05203247,0.038513184,-0.022415161,-0.002128601,0.014144897,-0.004459381,-0.0061073303,0.00031399727,0.031555176,0.03253174,-0.018814087,0.0040740967,-0.05078125,0.017028809,-0.007987976,-0.05432129,-0.019165039,0.029174805,-0.034576416,-0.006576538,0.0049209595,-0.032440186,-0.006427765,-0.018676758,0.024673462,-0.0040740967,0.0099487305,-0.020248413,-0.026565552,0.021942139,0.010559082,-0.0036830902,-0.0546875,-0.012001038,0.0075645447,0.00919342,0.051849365,-0.012672424,0.047943115,-0.00017809868,0.071777344,0.034088135,0.042877197,0.036224365,-0.004295349,0.0065574646,-0.0155181885,-0.026565552,0.051757812,-0.013191223,-0.03527832,-0.011314392,-0.010284424,-0.051635742,-0.012290955,-0.014572144,-0.080444336,-0.0050621033,0.019958496,-0.026031494,0.038757324,-0.08483887,-0.012748718,-0.038085938,-0.005958557,-0.00491333,0.021270752,-0.004146576,0.017349243,-0.00033307076,0.013114929,0.0017271042,-0.041778564,0.025360107,0.024002075,0.04837036,0.032684326,0.024002075,0.028381348,-0.0030078888,-0.010818481,-0.028259277,0.008369446,-0.028045654,-0.0050582886,0.011383057,0.013931274,-0.016204834,0.022750854,-0.040161133,0.0102005005,-0.050445557,0.042877197,0.027236938,0.0025787354,0.009979248,-0.044799805,-0.019302368,-0.0074005127,-0.02532959,-0.013694763,0.008926392,0.006427765,0.03137207,-0.02810669,-0.025878906,0.000004351139,-0.0088272095,-0.024108887,-0.057128906,-0.018295288,0.038146973,-0.02734375,0.025863647,0.022491455,-0.08691406,-0.00063848495,-0.045715332,0.008125305,-0.036712646,-0.0053634644,0.008041382,0.023117065,-0.025161743,-0.02784729,-0.0135269165,-0.040008545,-0.019622803,0.024093628,0.004272461,0.035888672,-0.018600464,0.024230957,0.024780273,-0.00022959709,0.007598877,0.025131226,-0.019622803,-0.0836792,-0.076171875,-0.024642944,-0.005077362,-0.011047363,-0.027801514,0.0047798157,-0.0026607513,-0.08154297,-0.029251099,-0.010147095,-0.0022277832,-0.034851074,-0.016357422,-0.035705566,0.010986328,-0.020233154,-0.052246094,-0.0010356903,-0.03100586,0.047821045,0.024551392,0.023834229,0.023162842,0.0064315796,0.056152344,0.028213501,-0.007133484,-0.027282715,0.019088745,-0.021835327,0.03591919,0.008155823,0.020828247,-0.031433105,0.048828125,0.06097412,0.0000692606,-0.032440186,0.0023899078,-0.05154419,-0.038330078,-0.02859497,0.021942139,0.006149292,-0.018218994,0.029586792,-0.04083252,-0.025421143,-0.0017433167,-0.0013303757,0.019714355,0.076049805,0.006500244,0.00447464,0.023925781,0.006038666,-0.058502197,0.043914795,0.036743164,0.016937256,-0.019424438,-0.037017822,0.033081055,0.04034424,-0.027633667,0.0008058548,-0.017669678,0.019882202,0.0023212433,0.004940033,0.023422241,-0.0209198,-0.023712158,-0.033325195,-0.015144348,0.02330017,0.0036296844,-0.033325195,-0.044311523,-0.07299805,0.044006348,0.034423828,0.016403198,-0.0072364807,0.008460999,-0.025634766,-0.0031356812,-0.070617676,0.053222656,0.07147217,0.0019989014,-0.029037476,0.02835083,0.0010490417,-0.025741577,-0.0002207756,-0.015640259,-0.025604248,-0.021514893,0.019866943,-0.04055786,0.0013103485,0.03137207,0.01979065,0.049713135,-0.025253296,-0.044189453,-0.029037476,-0.0071487427,-0.0026130676,-0.03338623,0.005180359,-0.00025486946,0.021575928,0.045776367,0.0018539429,0.01789856,-0.011245728,0.013717651,-0.0065307617,0.0058937073,-0.019302368,-0.017730713,0.011634827,0.0054092407,-0.06506348,0.014129639,-0.006225586,0.056518555,-0.04660034,0.030288696,-0.012702942,0.0121536255,0.047332764,-0.012145996,-0.034698486,-0.0077171326,0.030593872,0.04525757,0.04711914,0.010261536,-0.0062408447,-0.0072288513,0.06719971,0.00028204918,0.000010848045,-0.0049819946,0.017837524,0.021133423,-0.010726929,-0.047546387,-0.05291748,-0.0062713623,-0.021865845,0.03427124,-0.037017822,0.031188965,-0.0056877136,0.012672424,-0.023834229,0.005191803,-0.0446167,0.015670776,-0.008384705,0.00617218,-0.008102417,-0.03375244,0.0050964355,0.0116119385,-0.02494812,-0.011749268,0.04751587,0.010787964,-0.006614685,-0.043304443,-0.026916504,-0.016189575,-0.010864258,0.021209717,0.024307251,0.01966858,0.0340271,-0.040863037,0.0030136108,0.0028800964,0.016281128,0.030212402,-0.011062622,-0.0023059845,-0.050994873,-0.033966064,-0.023712158,-0.04095459,0.01689148,0.028808594,0.004787445,0.045196533,0.0054740906,-0.034301758,-0.030395508,0.015388489,-0.043395996,-0.0016975403,0.032409668,-0.011672974,-0.049560547,0.013427734,-0.0023784637,0.011184692,0.051239014,0.023986816,0.003665924,0.079956055,0.026687622,0.024032593,-0.003768921,0.026443481,0.038391113,0.003660202,-0.015327454,-0.031219482,-0.008636475,0.02784729,-0.039611816,-0.028778076,-0.06561279,0.056365967,0.031036377,0.09051514,0.013725281,0.01285553,0.040039062,-0.021148682,0.016296387,-0.0236969,-0.03753662,-0.031921387,-0.034301758,0.04537964,-0.0020656586,-0.002494812,-0.033935547,0.03475952,-0.0002477169,0.016998291,-0.027755737,0.052124023,-0.013763428,-0.00756073,0.007663727,0.0021877289,0.05255127,0.06365967,-0.04284668,0.021896362,0.016067505,-0.028945923,-0.0027122498,0.03225708,-0.0060539246,-0.01739502,-0.06488037,-0.028396606,-0.0037651062,-0.0035915375,-0.050842285,0.0048561096,0.012413025,0.02859497,0.025894165,-0.008911133,-0.009231567,-0.00016725063,-0.01386261,-0.04849243,-0.002357483,-0.056365967,-0.005924225,0.029830933,-0.037261963,-0.005592346,-0.0076141357,-0.003042221,-0.0067596436,0.013290405,0.029220581,-0.014724731,-0.064453125,0.044006348,-0.0034427643,0.0058937073,0.027755737,0.035888672,0.0340271,0.0010948181,0.04309082,0.018829346,-0.016204834,-0.04989624,0.02230835,-0.02696228,-0.008094788,0.01348114,-0.024032593,-0.0061950684,-0.019256592,-0.026367188,-0.024337769,0.024642944,-0.019836426,-0.007709503,0.034942627,-0.038146973,-0.04034424,-0.06323242,-0.017028809,0.00066804886,0.07519531,0.009529114,-0.00027179718,-0.056793213,-0.018157959,0.01651001,0.007835388,0.027618408,-0.016326904,-0.00957489,0.0020122528,-0.036224365,-0.005859375,-0.020629883,0.033966064,-0.017028809,-0.0107803345,0.012802124,0.01864624,0.015090942,0.004299164,0.0034313202,0.015419006,-0.015991211,-0.010650635,-0.025436401,0.013587952,0.00687027,0.0011472702,-0.047912598,0.05996704,0.018569946,0.04736328,-0.043121338,-0.0009841919,-0.002822876,0.007331848,0.022766113,-0.018936157,-0.007217407,-0.0050964355,-0.044921875,-0.06756592,0.03338623,-0.016952515,0.025543213,-0.002954483,-0.0020523071,0.041015625,-0.021453857,0.015823364,0.025817871,-0.02949524,-0.012451172,-0.04248047,-0.03765869,-0.0181427,0.0017747879,-0.031402588,0.022872925,-0.01889038,-0.0011205673,-0.018051147,-0.023040771,0.024154663,0.019241333,-0.015258789,0.023117065,0.0014247894,0.019744873,0.04949951,0.006500244,-0.03866577,0.016616821,0.004360199,0.0034046173,-0.0028972626,0.040130615,0.029220581,-0.01953125,-0.010971069,-0.0053215027,-0.011138916,-0.029052734,-0.011184692,0.004459381,0.015434265,0.0063323975,-0.012458801,0.008766174,0.007724762,-0.027008057,-0.014678955,0.007827759,0.02218628,-0.04135132,0.015457153,0.025558472,0.056640625,-0.03540039,-0.0021190643,0.0028858185,0.052459717,0.032989502,0.0017976761,-0.015991211,0.01914978,-0.024917603,0.00667572,-0.0057411194,-0.015174866,0.018676758,0.005355835,0.010864258,0.02684021,0.020874023,-0.03555298,-0.028381348,0.003522873,-0.015625,-0.029052734,0.028839111,0.028533936,0.015655518,-0.023666382,0.03201294,0.014198303,-0.01373291,-0.008110046,-0.01424408,0.040222168,-0.008964539,-0.014282227,0.025894165,0.0021896362,0.02609253,-0.055541992,-0.002960205,0.013824463,0.0069618225,-0.019561768,-0.0463562,-0.044067383,-0.0051498413,0.026779175,0.014709473,0.021865845,0.01889038,-0.00093126297,0.0037765503,0.016403198,-0.008178711,-0.009735107,-0.0011768341,-0.05444336,-0.017150879,-0.009895325,0.0025482178,-0.02848816,0.0115737915,-0.009399414,-0.043060303,0.004383087,-0.012207031,0.0009150505,-0.0141067505,0.008911133,0.04623413,-0.0057258606,0.024642944,-0.01474762,-0.028457642,-0.007080078,0.004940033,0.02583313,-0.04751587,0.026321411,-0.008483887,-0.010368347,0.0037345886,0.021148682,0.029190063,0.026000977,0.007545471,0.028015137,-0.042266846,0.048858643,-0.038848877,0.01802063,0.0040245056,-0.03326416,-0.022613525,-0.025024414,-0.013977051,0.04019165,-0.021026611,0.010375977,-0.025802612,-0.030654907,-0.0076293945,-0.050842285,0.019180298,0.03100586,0.041778564,-0.022033691,0.00793457,0.013679504,0.018127441,-0.026382446,-0.0016927719,-0.007987976,0.012252808,0.030426025,-0.0064201355,-0.025375366,-0.021652222,0.0032997131,0.0022792816,-0.055999756,-0.054260254,-0.022506714,0.0036773682,-0.0025634766,-0.010719299,-0.012649536,-0.03579712,0.0016508102,-0.031921387,0.016418457,0.0017089844,0.036193848,0.01486969,-0.035888672,0.006462097,0.020446777,-0.035095215,0.038482666,-0.008598328,-0.0062026978,-0.047790527,0.012107849,0.015258789,0.016693115,-0.008598328,-0.029251099,0.00045275688,-0.026657104,-0.051879883,-0.00005930662,-0.0066566467,0.0003578663,-0.011054993,-0.012878418,-0.054229736,-0.00712204,-0.01979065,-0.004623413,0.019454956,0.010116577,0.0070610046,0.0020217896,0.011764526,-0.01612854,-0.022094727,-0.02760315,0.0036945343,0.012054443,0.0069999695,0.02067566,0.043121338,-0.004310608,-0.03137207,0.00856781,0.00869751,0.026107788,-0.008781433,0.0047836304,-0.026473999,0.016479492,0.0014448166,-0.018112183,-0.039611816,0.000063717365,0.06817627,0.015174866,-0.0040283203,-0.0034561157,-0.01424408,0.008026123,0.03933716,-0.04156494,0.003932953,-0.029037476,0.0287323,-0.01713562,0.005519867,0.0033664703,0.026412964,-0.0112838745,-0.049438477,-0.0055503845,0.01159668,0.008781433,-0.05230713,-0.033294678,-0.062164307,0.006160736,-0.026855469,-0.021972656,-0.008956909,0.007820129,-0.013389587,-0.082336426,0.0034866333,0.059417725,0.0032444,0.021438599,-0.006965637,0.020935059,0.036712646,-0.023757935,-0.010818481,0.019515991,-0.03152466,-0.019683838,-0.019424438,0.030838013,-0.009666443,-0.010032654,0.018005371,0.01979065,0.028640747,0.004257202,0.009986877,-0.013183594,0.019104004,-0.000050783157,0.009460449,-0.003314972,-0.011489868,0.034820557,-0.04714966,0.030456543,0.0054092407,-0.00831604,0.007663727,0.030044556,0.045837402,-0.040100098,-0.02078247,0.03643799,0.004840851,0.0335083,-0.024642944,0.045013428,0.0073394775,-0.012451172,0.005382538,-0.012886047,-0.018859863,-0.031982422,-0.037628174,0.0362854,0.001247406,0.0088272095,-0.01386261,-0.013946533,0.02279663,0.0072021484,0.00881958,-0.019012451,-0.014266968,-0.02532959,0.01852417,0.008644104,0.0019378662,0.009513855,0.025115967,0.015823364,0.032226562,-0.012962341,-0.018127441,0.0064735413,0.02671814,-0.006778717,-0.002105713,0.021255493,0.018844604,0.010345459,0.02557373,0.014709473,-0.04055786,-0.016311646,-0.021835327,-0.02859497,-0.005710602,-0.009994507,-0.007621765,0.002981186,0.017623901,-0.019546509,-0.036071777,-0.00076818466,-0.034088135,-0.02003479,0.013954163,-0.011985779,0.024490356,0.013069153,0.010536194,0.0030174255,-0.0018901825,0.05621338,-0.0010061264,0.0029907227,0.041412354,0.029663086,0.014053345,-0.0317688,0.00066137314,-0.018737793,-0.02116394,0.0104522705,-0.02305603,0.009796143,0.03778076,-0.020584106,0.0095825195,-0.0007543564,0.018920898,0.008155823,-0.003921509,0.0012960434,0.006866455,-0.01689148,0.037322998,-0.05001831,0.008781433,0.018432617,0.01146698,-0.003730774,-0.024017334,-0.029251099,0.018035889,-0.0033779144,-0.0053138733,0.046325684,0.0042495728,0.029006958,-0.016342163,-0.036712646,0.011520386,-0.02607727,-0.022277832,0.018692017,-0.009712219,0.0011806488,0.0053977966,-0.02078247,0.027786255,-0.032226562,0.006252289,0.0058937073,-0.000187397,-0.007129669,-0.010925293,0.0017871857,-0.0044174194,-0.015640259,-0.0037727356,-0.013038635,0.041534424,0.033843994,0.027633667,0.029586792,0.024902344,-0.001953125,-0.03881836,-0.019180298,-0.0012893677,-0.014968872,0.00868988,-0.026367188,0.045196533,0.038330078,0.013114929,0.039764404,0.033813477,0.037506104,-0.008049011,0.0151901245,-0.024505615,0.01802063,-0.016189575,0.01651001,0.005493164,0.046020508,-0.03878784,0.0102005005,0.002614975,0.013427734,-0.019256592,0.033355713,0.060638428,0.018127441,-0.0038642883,0.03503418,-0.009056091,0.003107071,-0.0039024353,-0.02255249,0.053100586,0.0067596436,0.04071045,0.03616333,0.018035889,-0.0028839111,0.024429321,-0.03604126,-0.03201294,0.053833008,0.035736084,-0.020874023,-0.007320404,-0.014526367,0.0075035095,-0.041412354,-0.019836426,0.021835327,0.015327454,0.0046844482,-0.013679504,-0.021133423,-0.017181396,0.010299683,0.013336182,0.012008667,-0.0129470825,0.0206604,0.011917114,-0.0028648376,0.032592773,0.0036296844,0.02798462,-0.023742676,-0.027435303,0.0069351196,0.025848389,-0.0059432983,0.010070801,0.028778076,0.014541626,0.03378296,0.030395508,-0.026275635,0.001077652,0.023483276,0.011657715,0.0073661804,0.049224854,0.03274536,0.017929077,0.045013428,0.0413208,0.033966064,-0.031188965,0.0033435822,-0.0021858215,0.009414673,-0.005420685,-0.008872986,0.011161804,-0.012817383,0.020721436,0.005420685,-0.020507812,0.029846191,0.017974854,-0.0031871796,-0.0021800995,-0.00036025047,0.024627686,-0.0079574585,0.0010023117,0.008277893,-0.010292053,0.02696228,0.009780884,0.028640747,-0.021118164,0.022766113,0.003850937,-0.026123047,-0.01626587,0.016937256,-0.043945312,0.0068473816,-0.010726929,-0.01171875,-0.043304443,0.016357422,0.0234375,-0.002380371,0.026779175,0.012138367,-0.005748749,-0.010787964,0.034423828,0.022949219,-0.00944519,-0.008483887,-0.02368164,0.031051636,0.04006958,0.0055770874,0.0028743744,-0.007980347,0.007896423,0.011505127,-0.006259918,0.0138168335,0.0012655258,-0.007926941,-0.025970459,0.02015686,0.026992798,0.023895264,0.04135132,-0.00969696,-0.013175964,-0.0026073456,0.03878784,0.008460999,0.002702713,-0.014282227,0.026168823,-0.019683838,0.03955078,0.035369873,0.008071899,0.026916504,-0.005771637,0.0031223297,0.010719299,-0.01776123,0.020645142,-0.023590088,0.008300781,-0.006023407,0.026397705,-0.013549805,-0.038146973,0.003435135,-0.007911682,-0.029418945,-0.027160645,0.022903442,-0.0069503784,0.024505615,0.034332275,0.028289795,-0.021072388,0.068115234,-0.01751709,0.036193848,-0.0068969727,-0.02192688,0.06188965,0.02684021,0.032073975,0.023086548,0.010635376,-0.03390503,0.011253357,0.033416748,0.015197754,0.0034675598,0.0015649796,-0.021438599,0.035217285,-0.008979797,0.036834717,-0.0028533936,0.0063819885,0.0019760132,-0.012962341,-0.011703491,-0.002571106,0.0049552917,0.016418457,0.055999756,-0.01828003,-0.009429932,-0.016448975,-0.023605347,0.032806396,-0.0009250641,0.012969971,-0.0048561096,-0.027557373,0.013587952,-0.025115967,-0.026992798,0.020126343,0.03277588,-0.05569458,-0.014587402,0.00042963028,0.03488159,-0.03289795,0.025970459,0.02357483,-0.00308609,0.005794525,0.040740967,-0.008010864,0.025650024,-0.012283325,0.031951904,0.03942871,0.006122589,-0.019866943,-0.0067481995,0.015853882,0.0021305084,0.013252258,0.019485474,-0.015640259,0.013282776,0.004634857,-0.0058250427,-0.016326904,0.021621704,-0.017288208,0.009971619,-0.007835388,-0.008361816,0.013648987,0.009208679,0.0039901733,0.001452446,0.003370285,-0.015609741,0.00055265427,0.032684326,0.017059326,-0.036865234,-0.0034065247,0.018951416,0.014793396,-0.013191223,-0.012008667,-0.0053901672,-0.042175293,0.01184845,0.021865845,0.009864807,0.0057907104,-0.034240723,0.006088257,0.020584106,0.0055656433,0.027328491,0.0028324127,-0.019515991,0.0060920715,-0.013954163,0.0002975464,-0.009231567,-0.005130768,0.022872925,0.03652954,-0.0071487427,-0.024917603,0.029586792,-0.0016889572,0.009788513,0.00024747849,-0.006793976,0.027313232,-0.009391785,-0.005596161,0.0068244934,0.017852783,-0.004211426,-0.010475159,-0.018829346,0.036621094,0.055999756,-0.01953125,-0.009033203,0.012641907,0.019119263,0.024368286,0.04071045,0.018096924,0.032928467,0.019042969,-0.013420105,-0.031677246,0.026870728,-0.0040245056,-0.033325195,0.01663208,-0.010879517,-0.019958496,0.024841309,0.0076828003,0.00016331673,-0.025115967,-0.019226074,-0.017074585,-0.012214661,0.01928711,-0.0010404587,0.013259888,-0.031341553,-0.010917664,0.024780273,-0.02305603,-0.039276123,-0.016143799,-0.005958557,-0.008590698,-0.060913086,0.0053367615,-0.018478394,0.0035037994,-0.015037537,0.015914917,0.0019779205,0.037017822,-0.0043907166,-0.0059661865,0.0032444,0.030288696,0.02784729,0.007511139,0.015640259,-0.01940918,-0.008712769,-0.01600647,0.014297485,-0.013282776,0.0149383545,-0.0066604614,0.035827637,0.02456665,-0.022506714,0.0030403137,-0.011375427,-0.0071144104,-0.008644104,-0.027877808,-0.026855469,0.02305603,0.028625488,-0.006942749,-0.0077438354,0.04067993,-0.016860962,-0.011619568,0.020248413,0.036987305,0.0024471283,0.03918457,-0.004497528,-0.010604858,-0.018081665,-0.000030517578,-0.01159668,0.005580902,0.013519287,0.0016498566,0.0004222393,0.012084961,0.018859863,-0.009132385,0.0010709763,0.02394104,0.029800415,-0.02003479,0.03201294,0.015129089,-0.010955811,-0.01373291,-0.007820129,0.030944824,0.057556152,0.006706238,0.013542175,0.0005555153,0.0059280396,-0.0015144348,0.0073890686,0.010215759,-0.027236938,-0.040618896,-0.019348145,-0.023452759,0.021453857,-0.008483887,0.0037631989,-0.0026245117,0.012924194,-0.013389587,-0.026748657,-0.009056091,0.022109985,0.006462097,-0.013008118,-0.006225586,0.013923645,0.027282715,-0.036010742,-0.0062942505,-0.053344727,-0.030838013,-0.026611328,-0.0129852295,0.013587952,0.00415802,0.00011575222,0.006160736,0.0007324219,0.001912117,-0.0014696121,0.01625061,-0.012557983,0.0026378632,0.017669678,0.018798828,-0.013809204,0.017349243,-0.012313843,-0.008148193,0.0058670044,-0.009788513,0.00642395,-0.023101807,0.035705566,0.0004246235,-0.0036563873,0.035186768,-0.0006752014,0.009216309,-0.012863159,-0.004173279,0.0011510849,-0.0069847107,0.04046631,-0.016693115,-0.024230957,0.013504028,-0.008201599,-0.027023315,0.0039863586,0.018600464,0.032165527,-0.00970459,0.04925537,-0.0041046143,0.0007491112,0.022369385,0.009979248,-0.018188477,0.009361267,0.023147583,0.005592346,0.008491516,0.0047073364,-0.0048828125,-0.035705566,-0.010536194,0.021347046,-0.0027389526,-0.017593384,0.030151367,0.02420044,0.049041748,-0.01524353,0.021209717,0.033233643,-0.0044021606,0.030700684,-0.0011262894,0.04473877,0.00061035156,-0.02796936,-0.0046424866,0.0032157898,-0.017822266,0.0047798157,0.0071411133,-0.002023697,-0.033843994,-0.0061416626,0.011436462,0.02142334,-0.021362305,0.018234253,-0.02810669,-0.011291504,-0.031402588,0.0009703636,-0.035003662,0.008644104,0.03845215,0.02709961,0.020706177,-0.0070533752,-0.024871826,0.02835083,0.0501709,0.0110321045,-0.034606934,-0.020401001,0.0058631897,0.0005121231,-0.007347107,0.0027618408,-0.025405884,-0.013534546,-0.005344391,-0.0076942444,0.011856079,-0.0050201416,0.023788452,0.00756073,-0.013031006,-0.0023059845,0.015060425,-0.0070991516,-0.005176544,0.019348145,-0.00037670135,0.03579712,0.03289795,-0.016921997,0.020935059,0.013061523,-0.040863037,0.06286621,-0.0040130615,0.020339966,-0.011009216,0.02180481,-0.039031982,-0.008049011,-0.008361816,0.01675415],"createdAt":"2026-04-18T18:43:18.907Z","updatedAt":"2026-04-22T18:31:22.156Z","lastSeenAt":"2026-04-22T18:31:22.156Z","tsv":"'/api':178 '/api/v1/cards/100':57 '/docs':176 '/pricing':177 '/readme':179 '/request':16,32 '0.02':15,31,92,143 '000':82 '0x8335':70 '20':81 '2913':71 '402 payment api' '6':87 'accept':65 'access':63,157 'advertis':77,148 'ai':9,25,112 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':116 'analyt':8,24,106 'api':4,20,42,62,150 'avail':203 'base':7,23,51,73,83,171 'base network api' 'beyond':204 'call':41 'categori':102 'challeng':76 'cheap api' 'classif':119 'collect':36 'connect':184 'content':190 'contract':69 'convers':136 'conversion' 'crypto-gas' 'data':105,109 'data-analytics' 'decim':88 'descript':202 'detail':200 'document':174,196 'embed':120 'endpoint':13,29,43,55,104,201 'entir':161 'equal':91 'estim':130 'exampl':198 'exchang':125 'exchange-rates' 'export':110 'feed':124 'financ':10,26,121 'finance-prices' 'four':101 'gas':129 'gate':3,19,44 'generat':137 'geocod':134 'geocoding' 'handl':160 'header':166 'infrastructur':132 'insight':111 'instant':156 'key':151 'l2':172 'land':98,206 'learn':114 'limit':154 'list':59,100 'low payment fee' 'lowpaymentfee.com':33 'machin':113 'maxamountrequir':79 'metric':107 'micropayment api' 'network':52,173 'offer':34 'page':99,175,207 'pay':39 'pay per call api' 'pay-per-cal':38 'pay-per-request' 'payment':66,158,165 'per':40,93,144 'platform':147 'premium':61 'price':123,140 'prompt':186 'protocol':48 'provid':96 'quot':128 'rate':126,153 'report':108 'request':94,145 'request/response':197 'return':181 'schema':195 'sentiment':115 'specif':54 'substant':189 'suit':5,21 'summar':118 'summari':208 'text':117 'token':127 'uniform':141 'unit':84 'usdc':68,90,168 'usdc api' 'usdc-base' 'use':167 'util':12,28,133 'valid':135 'validation' 'wallet':185 'web3':122 'x402':2,18,47,75,164 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"6035fd44-28b3-4bee-961c-24cccf05f1dd","listingId":"1cb3e9b0-9208-48d4-aaed-15368b2dae98","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/cards/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:18.907Z"}],"sources":[{"listingId":"1cb3e9b0-9208-48d4-aaed-15368b2dae98","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:18.907Z","lastSeenAt":"2026-04-22T18:31:22.156Z"}],"details":{"listingId":"1cb3e9b0-9208-48d4-aaed-15368b2dae98","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/100 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/100"},{"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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/100"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running AI inference tasks (sentiment analysis, text summarization, classification, embeddings) on a per-request payment basis","Accessing utility services like geocoding, validation, and data conversion with minimal overhead","Agents autonomously purchasing API calls using x402 USDC payments on Base"],"bestFor":["AI agents that need on-demand API access without pre-registration","Developers wanting pay-as-you-go access to diverse endpoints without subscriptions","Low-volume or sporadic usage where per-request pricing is more economical than monthly plans"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.729Z"},"updatedAt":"2026-04-22T18:31:22.156Z"}}