{"id":"4de84c98-aaf4-4d02-b303-93f658419111","shortId":"M85gvY","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/policies/51` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises 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 listed endpoints share the same $0.02/request pricing. However, the specific functionality behind the `/api/v1/policies/51` path is not documented beyond the generic \"Premium API Access\" label, so its exact input/output behavior is unclear.\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 spec, no request/response examples, and no description of what the policies endpoint actually returns. Agents should be aware that while the endpoint is live and responds with a valid x402 challenge, the actual payload and use case remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment required"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/policies/51 ('Premium API Access') is completely undocumented; input and output schemas are unknown.","No OpenAPI spec or request/response examples are provided anywhere on the site.","Cannot verify what data or service is actually returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/51","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/policies/51","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 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no documentation of request/response schemas, and no explanation of what the /api/v1/policies/51 endpoint actually does. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. 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":"2026-04-19T08:15:30.769Z","embedding":[-0.024353027,-0.02532959,0.037719727,0.005290985,0.0066070557,-0.009208679,-0.036621094,0.023864746,0.072631836,-0.046691895,0.04827881,-0.051849365,-0.026153564,-0.037017822,-0.02507019,0.016067505,-0.01838684,0.008781433,-0.039520264,0.043395996,0.041748047,-0.00054836273,-0.027420044,0.041931152,-0.0046577454,-0.031219482,0.017944336,0.0031337738,-0.019561768,-0.04437256,0.036712646,-0.027175903,-0.0115356445,0.0013923645,-0.009284973,-0.0027618408,0.001200676,0.037872314,0.028076172,0.0050239563,0.00020670891,-0.062438965,0.014526367,-0.0067214966,-0.041656494,-0.0023174286,0.027145386,-0.025985718,-0.01737976,-0.008460999,-0.031707764,-0.013259888,-0.015777588,-0.0012197495,0.011131287,0.01285553,0.00024044514,-0.028900146,0.024246216,0.008056641,-0.006587982,-0.059631348,-0.016952515,0.02760315,0.016021729,0.05050659,0.004737854,0.04220581,0.011001587,0.0692749,0.041900635,0.044891357,0.015975952,0.000016391277,-0.016281128,-0.026916504,-0.0155181885,0.05441284,-0.021148682,-0.0054855347,-0.018112183,-0.009735107,-0.039764404,-0.012031555,-0.029129028,-0.057006836,-0.020233154,0.0071792603,-0.026031494,0.025543213,-0.0715332,-0.0074043274,-0.036956787,0.01109314,-0.008705139,-0.011802673,-0.014671326,0.019622803,-0.0030231476,0.0067634583,-0.012550354,-0.049682617,0.0049972534,0.019180298,0.06573486,0.033569336,0.0062789917,0.01838684,0.010566711,-0.031280518,-0.038726807,-0.010681152,-0.015029907,0.0033779144,0.0012750626,0.008705139,-0.02810669,0.03643799,-0.014160156,0.023605347,-0.06628418,0.05859375,0.014724731,-0.014808655,0.008506775,-0.052001953,-0.010986328,0.012634277,-0.046173096,-0.0132369995,0.038604736,0.0056495667,0.026748657,-0.036499023,-0.0368042,0.015960693,0.0020503998,-0.023727417,-0.05065918,-0.008155823,0.026382446,-0.026733398,0.020614624,0.025650024,-0.10498047,0.00062799454,-0.046783447,0.009124756,-0.026397705,-0.005176544,0.02557373,0.027923584,-0.009666443,-0.026351929,-0.02659607,-0.03314209,-0.013381958,0.04788208,0.006374359,0.03125,-0.009277344,0.04437256,0.0063285828,0.0041275024,0.024856567,0.035705566,0.005340576,-0.078125,-0.09020996,-0.04119873,-0.019195557,-0.006855011,-0.028686523,-0.0009236336,-0.007949829,-0.10003662,-0.030014038,-0.025497437,0.0075416565,-0.044555664,0.0023841858,-0.03375244,-0.015205383,-0.026779175,-0.05105591,-0.019241333,-0.039093018,0.050689697,0.0027923584,0.0068092346,0.020462036,0.0049057007,0.050933838,0.024597168,-0.0059013367,-0.039794922,0.010169983,-0.03173828,0.050323486,0.015083313,-0.0020999908,-0.03149414,0.043121338,0.05441284,-0.0026474,-0.029296875,0.006576538,-0.04559326,-0.058807373,-0.044555664,0.0037899017,-0.004173279,-0.015411377,0.024414062,-0.034576416,-0.022766113,-0.003528595,0.014884949,0.017623901,0.090270996,0.011886597,0.016342163,0.020935059,0.0112838745,-0.03652954,0.05029297,0.007549286,0.01902771,-0.020126343,-0.021347046,0.00018775463,0.042022705,-0.034942627,-0.0023765564,-0.02330017,0.018295288,0.009101868,0.010269165,0.021560669,-0.024475098,-0.01675415,-0.023254395,-0.011932373,0.027053833,0.0061187744,-0.03463745,-0.033843994,-0.0619812,0.028030396,0.039916992,0.033233643,0.0070266724,-0.0007171631,-0.027938843,-0.008232117,-0.05960083,0.045837402,0.059631348,-0.0158844,-0.020599365,0.023132324,0.011047363,-0.014701843,-0.027053833,-0.0105896,-0.033935547,-0.02456665,0.013931274,-0.024871826,0.0005469322,0.023101807,0.028579712,0.036376953,-0.01914978,-0.05203247,-0.034301758,0.005744934,0.0008468628,-0.034576416,0.016998291,-0.007381439,0.013671875,0.01889038,-0.0049324036,0.0446167,-0.00069093704,0.0008072853,-0.012763977,-0.0028686523,-0.029846191,-0.024642944,0.04058838,0.0030765533,-0.07006836,0.018447876,-0.0022144318,0.07165527,-0.05419922,0.04888916,-0.022003174,0.013374329,0.047973633,-0.0178833,-0.04031372,-0.0046081543,0.020355225,0.04421997,0.016815186,0.00074005127,-0.0107421875,-0.008377075,0.044952393,-0.022979736,-0.015007019,0.0027313232,0.015052795,0.040863037,0.0047035217,-0.050445557,-0.03274536,-0.014701843,-0.041229248,0.027435303,-0.016204834,0.033447266,-0.016403198,0.014907837,-0.009414673,0.020385742,-0.03173828,0.014198303,-0.040161133,0.0032978058,-0.015083313,-0.009666443,-0.0107040405,0.021713257,-0.010475159,0.007888794,0.029846191,-0.0003144741,-0.011398315,-0.029922485,-0.023422241,-0.037475586,-0.007083893,0.0031032562,0.011482239,0.023651123,0.05218506,-0.02015686,-0.007896423,0.014556885,0.022323608,0.019897461,0.0040893555,0.0021800995,-0.06506348,-0.07476807,-0.017364502,-0.03591919,0.01537323,0.012580872,0.014434814,0.02810669,-0.0070533752,-0.0014123917,-0.03753662,0.016662598,-0.027496338,-0.0077400208,0.017196655,-0.038482666,-0.045959473,0.01146698,-0.0018196106,-0.0010290146,0.042755127,0.023468018,0.0079422,0.06298828,0.044677734,0.017837524,0.023223877,0.020553589,0.024520874,-0.008102417,-0.018035889,-0.025726318,-0.011512756,0.042999268,-0.01637268,-0.023010254,-0.057250977,0.05609131,0.017837524,0.062561035,0.0018835068,0.029159546,0.020111084,-0.00044870377,0.011062622,-0.017456055,-0.008636475,-0.041229248,-0.038726807,0.026657104,-0.0107421875,-0.024993896,-0.040100098,0.03366089,-0.009239197,0.0069999695,-0.027572632,0.05227661,-0.027252197,-0.003993988,0.012825012,0.0055389404,0.05731201,0.05795288,-0.05392456,0.015106201,0.019927979,-0.008056641,-0.01071167,0.037322998,-0.00003093481,-0.02029419,-0.05557251,-0.028869629,-0.009223938,-0.013397217,-0.057739258,0.0031719208,-0.0032806396,0.020141602,0.015174866,-0.0007557869,-0.01600647,0.0099105835,-0.023757935,-0.050720215,0.01626587,-0.047851562,0.0024490356,0.044830322,-0.02168274,0.012817383,-0.016998291,-0.010566711,0.010299683,0.016571045,0.009613037,0.0025901794,-0.049743652,0.049560547,0.007751465,0.010688782,0.030899048,0.036987305,0.04248047,0.016174316,0.048034668,0.020324707,-0.024383545,-0.065979004,0.020996094,-0.055358887,0.017166138,0.0044288635,-0.016464233,-0.009521484,-0.019134521,-0.021087646,-0.020477295,0.009178162,-0.02029419,0.0058517456,0.017654419,-0.031341553,-0.047698975,-0.05429077,-0.016204834,0.00087070465,0.074523926,0.022644043,-0.007534027,-0.066223145,-0.012748718,0.015296936,0.0027179718,0.025466919,-0.014923096,-0.006576538,-0.017791748,-0.028625488,-0.030090332,-0.044830322,0.046051025,-0.010124207,-0.028930664,0.017623901,-0.006454468,0.0037441254,0.0034503937,-0.008071899,0.016799927,-0.028396606,-0.005996704,-0.044921875,0.010070801,0.003873825,-0.0019235611,-0.03768921,0.046569824,0.02027893,0.0423584,-0.03451538,0.013931274,-0.010063171,0.0087890625,0.010925293,0.00034236908,-0.0024929047,0.005317688,-0.036468506,-0.079589844,0.032104492,-0.022323608,0.025161743,0.0076675415,0.0057029724,0.03704834,-0.0121154785,0.016418457,0.023803711,-0.0211792,-0.006462097,-0.020080566,-0.028335571,-0.036102295,0.0047340393,-0.019363403,0.01322937,-0.018508911,0.009681702,-0.02218628,-0.016342163,0.04034424,0.023361206,-0.013137817,0.018753052,0.009017944,0.014762878,0.039276123,0.011795044,-0.044403076,0.023345947,0.012435913,-0.0070724487,-0.013679504,0.039916992,0.022888184,-0.021560669,-0.01612854,-0.001282692,-0.012008667,-0.01121521,-0.019821167,0.018051147,0.027999878,0.020812988,-0.031982422,0.008224487,0.010520935,-0.024749756,-0.02142334,0.013694763,0.017211914,-0.0463562,0.018478394,0.0090408325,0.045776367,-0.029769897,0.0066337585,0.0022392273,0.038513184,0.011650085,0.008384705,0.0030345917,0.011581421,-0.015045166,0.0024089813,-0.006767273,-0.0064735413,0.025726318,0.005050659,0.011917114,0.03338623,0.01663208,-0.036132812,-0.030670166,0.010757446,-0.015602112,-0.01586914,0.03527832,0.019699097,0.017547607,-0.019470215,0.021057129,0.028366089,-0.022720337,-0.016677856,-0.018005371,0.039520264,-0.019363403,0.0009021759,0.019851685,0.0075149536,0.009811401,-0.04260254,0.0018339157,-0.0011377335,0.0017662048,-0.02279663,-0.054016113,-0.037994385,-0.0004878044,0.03955078,0.007045746,0.00869751,0.029800415,0.01725769,0.0031700134,0.022949219,-0.0043144226,-0.00818634,-0.022979736,-0.041778564,-0.014251709,-0.0060539246,-0.0058250427,-0.04043579,0.020050049,-0.03668213,-0.038085938,0.009017944,-0.015281677,-0.0075149536,-0.0035190582,-0.006275177,0.015838623,0.0038833618,0.021270752,-0.0103302,-0.030166626,-0.005420685,0.003282547,0.03253174,-0.03668213,0.017456055,-0.0014801025,-0.0014123917,0.0018358231,0.014053345,0.026473999,0.035186768,0.007904053,0.023605347,-0.03955078,0.025619507,-0.024032593,0.00983429,-0.0020561218,-0.032104492,-0.020065308,-0.015411377,-0.019348145,0.036010742,-0.0158844,-0.008918762,-0.022491455,-0.031036377,-0.021514893,-0.047607422,0.0132369995,0.04473877,0.039794922,-0.02116394,0.004360199,0.016204834,-0.007835388,-0.01184845,-0.0049743652,0.0065727234,0.044769287,0.019546509,-0.00028944016,-0.035980225,-0.017303467,0.0033226013,0.01007843,-0.044952393,-0.05090332,-0.0037117004,0.005874634,0.00044107437,-0.01979065,-0.037841797,-0.035125732,0.0011634827,-0.03201294,0.0051841736,0.009521484,0.0012655258,0.021011353,-0.034729004,0.009017944,0.028549194,-0.030593872,0.027389526,-0.020858765,-0.0046691895,-0.056671143,0.013435364,0.03463745,0.014289856,-0.0057258606,-0.04006958,0.001953125,-0.022598267,-0.05593872,0.0035171509,-0.0118255615,0.003604889,0.009162903,-0.0027751923,-0.051696777,-0.012283325,-0.017349243,0.010505676,0.004940033,0.011634827,0.0017910004,0.0013208389,0.00009840727,-0.0050735474,-0.0049324036,-0.03591919,0.014579773,0.011253357,-0.0090408325,0.013153076,0.04824829,0.010040283,-0.01939392,-0.0040664673,-0.00018775463,0.017028809,-0.01828003,-0.0004246235,-0.022613525,-0.0022964478,-0.01878357,-0.008743286,-0.036010742,0.0010471344,0.06945801,0.008346558,0.022491455,-0.0024089813,-0.020233154,0.02078247,0.05142212,-0.038330078,-0.011741638,-0.033081055,0.033935547,-0.016830444,0.011169434,0.005252838,0.012306213,-0.019134521,-0.055877686,-0.0051727295,0.01889038,0.00674057,-0.06976318,-0.023025513,-0.0690918,-0.002664566,-0.022003174,-0.034179688,-0.002922058,-0.0012540817,-0.024108887,-0.07287598,0.012962341,0.060180664,0.008880615,0.017700195,-0.013023376,0.03265381,0.032714844,-0.030715942,-0.022781372,0.024353027,-0.025466919,-0.0181427,-0.026168823,0.04119873,-0.017669678,-0.013366699,-0.00233078,0.027008057,0.019760132,-0.005130768,0.023986816,-0.017456055,0.02458191,-0.006614685,0.012954712,-0.0030345917,-0.0020484924,0.039733887,-0.057647705,0.015296936,0.019332886,0.00052690506,-0.012550354,0.030639648,0.034088135,-0.038726807,-0.020126343,0.022109985,0.013343811,0.041503906,-0.01826477,0.059692383,0.018798828,-0.01184082,0.011383057,-0.01499176,-0.017227173,-0.043426514,-0.03491211,0.0155181885,-0.0026779175,0.015975952,-0.02128601,-0.0010604858,0.025970459,0.0053215027,0.004760742,-0.029129028,-0.00907135,-0.028259277,0.016708374,0.012611389,-0.0060691833,0.0012483597,0.016708374,0.03010559,0.04421997,-0.003829956,-0.0039100647,0.010551453,0.024765015,-0.012718201,0.0068092346,0.015716553,0.022262573,0.010978699,0.021316528,0.013435364,-0.04815674,-0.006793976,-0.010627747,-0.010986328,0.021194458,0.0033836365,0.020446777,-0.007873535,0.0039253235,-0.011375427,-0.041381836,-0.000086426735,-0.024276733,-0.03805542,-0.011924744,-0.018707275,0.011054993,0.0043945312,0.002872467,0.0017948151,-0.0061416626,0.04360962,-0.010940552,0.0018835068,0.023773193,0.04916382,0.019302368,-0.0317688,-0.0054779053,-0.0077781677,0.0021305084,0.0088272095,-0.01940918,0.015975952,0.044311523,-0.01586914,0.011070251,0.005279541,0.034240723,-0.0021095276,0.0042762756,0.0075683594,0.023757935,-0.026016235,0.034820557,-0.048675537,0.00724411,0.014846802,0.009460449,0.0030593872,-0.020263672,-0.01209259,0.01033783,-0.002248764,-0.0054512024,0.044189453,0.00035524368,0.02720642,-0.026489258,-0.038604736,-0.008331299,-0.019012451,-0.025466919,0.013435364,-0.00447464,0.0025901794,0.016220093,-0.016616821,0.028625488,-0.0491333,-0.0001757145,0.021957397,-0.009422302,-0.009300232,-0.010978699,-0.0021438599,-0.013114929,-0.004875183,0.0065460205,-0.0028057098,0.040802002,0.005264282,0.035217285,0.019256592,0.02268982,0.009597778,-0.0446167,-0.012817383,0.002614975,-0.013496399,0.015296936,-0.02357483,0.036315918,0.033416748,-0.00052022934,0.035614014,0.050811768,0.028320312,-0.017349243,0.013214111,-0.0088272095,0.034088135,-0.00605011,0.0051498413,-0.0021820068,0.04815674,-0.040771484,0.017120361,-0.0009756088,0.015556335,-0.018478394,0.033966064,0.061706543,0.035095215,0.007850647,0.034362793,-0.018157959,-0.013771057,-0.013206482,-0.0034599304,0.049224854,-0.009628296,0.045288086,0.023773193,0.0099105835,-0.0054893494,0.03744507,-0.020721436,-0.03668213,0.052124023,0.032165527,-0.029953003,-0.0062179565,-0.005367279,0.0057258606,-0.031463623,-0.025848389,0.019989014,0.007461548,-0.0034065247,-0.005104065,0.0017728806,-0.009223938,0.010169983,-0.0135269165,-0.0049819946,-0.00008291006,0.01838684,0.025405884,0.00090408325,0.029953003,0.021118164,0.032104492,-0.01687622,-0.027236938,0.021728516,0.020965576,0.0090408325,0.0082092285,0.013710022,0.03277588,0.038269043,0.03125,-0.03286743,-0.00907135,0.01739502,0.014831543,0.0071907043,0.029815674,0.027832031,0.0001912117,0.029556274,0.051208496,0.030639648,-0.03314209,0.009681702,-0.016418457,0.00983429,-0.011810303,-0.021362305,0.011062622,-0.0033874512,-0.00032925606,-0.006187439,-0.00079250336,0.025375366,0.01776123,-0.003955841,0.0043640137,-0.0074310303,0.008171082,-0.0037269592,0.00592041,0.014038086,-0.012107849,0.0078048706,0.0236969,0.021377563,-0.033203125,0.027008057,0.004016876,-0.03161621,0.008560181,0.009727478,-0.04714966,-0.010604858,-0.0037612915,-0.004863739,-0.034362793,-0.002243042,0.014411926,0.0013751984,0.024291992,0.016494751,-0.0025234222,-0.022644043,0.027282715,0.024261475,-0.0026664734,0.0047073364,-0.014976501,0.015296936,0.03277588,-0.0042152405,-0.0024967194,-0.028900146,0.00054883957,0.018997192,-0.0044288635,0.0115356445,0.0010728836,-0.008338928,-0.035461426,0.0067863464,0.027130127,0.028823853,0.036315918,-0.034332275,-0.0023860931,-0.0027694702,0.025924683,0.006919861,0.008529663,-0.0023002625,0.020645142,-0.018081665,0.03363037,0.03213501,-0.0015830994,0.017837524,-0.01687622,-0.01902771,0.011940002,-0.01576233,0.020263672,-0.020248413,0.011253357,-0.0076065063,0.013534546,-0.012535095,-0.034820557,-0.0031471252,-0.021011353,-0.019241333,-0.023483276,0.028396606,-0.0033931732,0.019515991,0.022598267,0.024017334,-0.024978638,0.06341553,-0.017654419,0.043945312,-0.014923096,-0.005996704,0.059326172,0.039978027,0.0345459,0.004432678,0.0041923523,-0.020385742,0.016952515,0.023132324,0.03010559,0.0025615692,0.011367798,-0.012336731,0.03643799,0.0030841827,0.029052734,0.016098022,0.0037975311,0.009063721,-0.018463135,-0.014976501,-0.0107040405,-0.015975952,0.010009766,0.049102783,-0.019256592,-0.013084412,-0.029418945,-0.017181396,0.028076172,-0.002368927,0.004951477,0.0074882507,-0.030883789,0.012008667,-0.024627686,-0.0038108826,0.011795044,0.03414917,-0.051635742,-0.005142212,0.013771057,0.025436401,-0.021606445,0.027938843,0.03451538,0.0030097961,0.0018558502,0.035980225,0.0052223206,0.03717041,-0.0036678314,0.027542114,0.04876709,-0.0005955696,-0.013763428,0.010391235,0.017532349,-0.0067863464,0.004966736,0.034240723,0.008476257,0.0013771057,0.007873535,-0.0012159348,0.013656616,0.021514893,-0.0059547424,0.0033111572,-0.0023880005,-0.013824463,0.0079193115,0.0033931732,0.0016365051,0.007675171,-0.008354187,-0.017471313,0.007587433,0.028427124,0.013877869,-0.021606445,0.0016841888,0.0309906,0.008491516,-0.026138306,-0.008552551,-0.010726929,-0.031402588,0.0075263977,0.03756714,0.0071372986,0.014808655,-0.016860962,-0.015213013,0.031173706,0.012290955,0.007713318,0.006149292,-0.017456055,0.011024475,-0.0309906,0.001499176,-0.009521484,-0.006702423,0.013679504,0.02861023,0.002500534,-0.020614624,0.020355225,0.00093126297,0.002380371,-0.004486084,-0.0128479,0.015029907,-0.011177063,-0.0038833618,-0.011184692,0.005744934,-0.018829346,-0.022598267,-0.023803711,0.035308838,0.050109863,-0.0107040405,-0.0059394836,0.005897522,0.017410278,0.027282715,0.035736084,0.0054397583,0.03366089,0.015777588,-0.015586853,-0.035217285,0.019226074,-0.024047852,-0.038116455,0.018615723,-0.012420654,-0.004798889,0.011367798,-0.0028514862,-0.000854969,-0.03564453,-0.016235352,-0.008934021,-0.015014648,0.03845215,-0.00040864944,0.0152282715,-0.026321411,-0.02368164,0.018814087,-0.025405884,-0.04058838,-0.018630981,-0.012954712,-0.029815674,-0.059326172,0.017456055,-0.026153564,0.01737976,-0.02456665,0.016494751,-0.015296936,0.035888672,-0.0022392273,0.013679504,0.014129639,0.02861023,0.015777588,0.007873535,0.0135269165,-0.026947021,-0.027938843,-0.010238647,-0.00093507767,-0.0044174194,0.018157959,-0.006416321,0.03213501,0.0044670105,-0.005672455,0.0054092407,-0.0058250427,-0.0047340393,-0.012382507,-0.028289795,-0.017105103,0.006450653,0.01789856,-0.012283325,-0.01625061,0.042297363,-0.018707275,-0.013961792,0.016845703,0.03857422,0.024841309,0.044403076,-0.020690918,0.0049476624,-0.030319214,0.0093688965,-0.006793976,0.0071525574,0.0065841675,0.0043678284,-0.009025574,-0.0026016235,0.010986328,-0.008407593,-0.0008883476,0.02468872,0.013587952,-0.00592041,0.031173706,0.014198303,0.0024356842,-0.012428284,-0.008148193,0.013397217,0.06213379,0.011245728,0.011329651,-0.013252258,0.01651001,-0.008850098,0.008132935,0.011245728,-0.027420044,-0.031173706,-0.02180481,-0.019439697,0.03616333,-0.00046300888,-0.0012311935,-0.00699234,0.027709961,-0.0075035095,-0.027648926,-0.018447876,0.015716553,-0.00054836273,-0.03338623,0.002714157,0.0010719299,0.026367188,-0.029022217,-0.0015010834,-0.04208374,-0.025299072,-0.029815674,-0.034973145,0.024139404,0.014472961,-0.0075950623,-0.0032634735,-0.001912117,-0.006919861,0.0024204254,0.02458191,-0.003522873,-0.014289856,-0.001080513,0.024871826,-0.013694763,0.009468079,0.0016651154,-0.009262085,-0.0011873245,-0.012481689,0.016738892,-0.022888184,0.036499023,0.005657196,0.0017385483,0.036956787,0.008796692,0.03353882,-0.022201538,0.0032138824,-0.016525269,-0.0154953,0.036956787,-0.021347046,-0.022323608,0.0073509216,-0.005508423,-0.039855957,0.009933472,0.02357483,0.012214661,-0.023162842,0.05090332,-0.0071640015,-0.012023926,0.017349243,0.020309448,-0.0063552856,0.014778137,0.025970459,-0.0021438599,-0.001373291,-0.012969971,-0.004436493,-0.018432617,-0.015296936,0.022720337,-0.015701294,-0.015205383,0.017074585,0.006587982,0.035247803,-0.01008606,0.019210815,0.024917603,0.0008916855,0.03781128,0.019866943,0.06854248,-0.004924774,-0.037841797,-0.009422302,0.008270264,-0.023956299,0.00422287,-0.007408142,0.008369446,-0.027755737,0.014472961,0.004611969,0.00749588,-0.018035889,0.0039863586,-0.021469116,-0.0013551712,-0.043823242,0.00047969818,-0.045928955,-0.0013494492,0.04348755,0.016784668,0.022781372,0.00045394897,-0.019729614,0.03942871,0.055725098,0.005924225,-0.045196533,-0.0068359375,0.006439209,-0.0008225441,-0.008743286,0.011543274,-0.03225708,-0.034423828,-0.005378723,-0.017211914,0.005268097,-0.010658264,0.029418945,0.015426636,-0.0064430237,-0.008758545,0.005832672,-0.0040664673,0.0043144226,0.007865906,-0.012161255,0.02923584,0.03390503,-0.018554688,0.017684937,0.02583313,-0.031829834,0.041809082,-0.006252289,0.011672974,-0.0234375,0.014411926,-0.03668213,-0.010299683,-0.0042800903,0.014091492],"createdAt":"2026-04-18T18:52:12.850Z","updatedAt":"2026-04-22T21:31:13.803Z","lastSeenAt":"2026-04-22T21:31:13.803Z","tsv":"'/api':197 '/api/v1/policies/51':67,172 '/docs':196 '/pricing':198 '/readme':200 '/request':17,34,164 '0.02':16,33,89,163 '000':83 '20':82 '402 payment required' '6':93 'access':45,73,182 'actual':230,250 'advertis':119 'agent':232 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,41,72,107,181 'awar':235 'base':7,24,61,84 'base network api' 'behavior':188 'behind':51,170 'beyond':177 'broader':117 'call':96 'case':254 'categori':121 'challeng':78,248 'classif':138 'connect':206 'convers':155 'data':9,26,124,128 'decim':94 'descript':224 'detail':213 'document':176,191 'embed':139 'endpoint':14,31,50,65,123,159,229,239 'estim':149 'exact':103,186 'exampl':221 'exchang':144 'export':129 'extrem':193 'feed':143 'financ':11,28,140 'four':120 'function':169 'gas':148 'gate':3,20,44 'generat':156 'generic':179 'geocod':153 'given':90 'howev':166 'i.e':88 'infrastructur':151 'input/output':187 'insight':130 'json-api' 'key':108 'label':183 'learn':133 'limit':111 'list':69,158 'live':241 'low payment fee' 'lowpaymentfee.com':35 'machin':132 'made':99 'marketplac':42 'metric':126 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':217 'page':201 'path':173 'pay-per-request api' 'payload':251 'payment':97 'per':53,95 'per-request':52 'per-request-micropayment' 'platform':5,22,118 'polici':228 'premium':71,180 'price':142,165 'prompt':208 'protocol':40 'quot':147 'rate':110,145 'remain':255 'render':203 'report':127 'request':54,79 'request/response':220 'requir':115 'respond':243 'return':75,231 'scheme':104 'sentiment':134 'settl':56 'share':160 'spars':194 'spec':218 'specif':64,168 'subscript':114 'summar':137 'technic':212 'text':136 'token':146 'unclear':190 'undocu':256 'unit':85 'usdc':58,87,91 'usdc api access' 'usdc-base' 'use':253 'util':13,30,152 'valid':154,246 'varieti':48 'via':100 'wallet':207 'web3':141 'x402':2,19,39,77,102,247 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"feba6b96-6a28-4b2f-b468-366b5d5c5888","listingId":"4de84c98-aaf4-4d02-b303-93f658419111","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/policies/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:12.850Z"}],"sources":[{"listingId":"4de84c98-aaf4-4d02-b303-93f658419111","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:12.850Z","lastSeenAt":"2026-04-22T21:31:13.803Z"}],"details":{"listingId":"4de84c98-aaf4-4d02-b303-93f658419111","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# Use an x402-compatible client to handle the payment challenge automatically.\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/51 \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/policies/51"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Programmatic agent access to gated endpoints via x402 micropayments","Exploring x402 protocol integration with USDC on Base"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","x402 protocol experimentation and integration testing","Low-cost per-call API consumption without account setup"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","Production workloads requiring well-documented input/output schemas","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.971Z"},"updatedAt":"2026-04-22T21:31:13.803Z"}}