{"id":"73a59db7-92d0-443a-bdff-e54be6a4e6cd","shortId":"wKzsrz","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a broad set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/keys/53` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 16+ endpoints organized into four categories: 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 (geocoding, validation, conversion, generation). All share the same $0.02 flat pricing. No OpenAPI schema, detailed input/output documentation, or usage examples were found in the crawl, so the exact request and response formats for each endpoint remain unclear.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","pay per call API","x402 API","USDC API","Base network API","micropayment API","serverless API","no-auth API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","No request/response examples or field-level documentation found","The purpose of /api/v1/keys/53 specifically (vs. other endpoints) is unclear — 'Premium API Access' is a generic label","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/53","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/keys/53","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/request in USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no usage examples, and the /api, /pricing, and /README pages all returned only a 'Connect wallet' stub. The specific purpose of the `/api/v1/keys/53` endpoint beyond 'Premium API Access' is unknown.","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":"2026-04-21T22:23:59.632Z","embedding":[-0.023498535,-0.030303955,0.060333252,0.009727478,0.011245728,-0.029754639,-0.023605347,0.03314209,0.06567383,-0.0597229,0.021514893,-0.05355835,-0.028366089,-0.03677368,-0.024032593,0.003250122,-0.0069465637,0.00091171265,-0.04248047,0.03111267,0.0093688965,-0.026016235,-0.010620117,0.024017334,0.0013933182,-0.018508911,-0.009109497,-0.023010254,-0.019180298,-0.03829956,0.05218506,-0.027908325,-0.0206604,0.01953125,-0.024124146,-0.00020325184,-0.009902954,0.021408081,0.033325195,-0.008995056,-0.016952515,-0.061553955,0.0034179688,-0.018630981,-0.04763794,-0.01398468,0.011421204,-0.019088745,0.003921509,0.00907135,-0.03756714,-0.006958008,-0.011802673,-0.00036478043,0.0044288635,0.024093628,-0.007331848,-0.0015058517,0.029022217,0.0018396378,0.00843811,-0.048461914,-0.008918762,0.007293701,-0.0023612976,0.0513916,-0.018066406,0.046661377,0.011291504,0.05456543,0.024841309,0.051208496,0.026809692,0.00920105,0.0041656494,-0.0021152496,-0.015007019,0.066833496,-0.003627777,-0.03012085,-0.010055542,-0.017501831,-0.03677368,-0.0063667297,-0.008872986,-0.05130005,-0.02255249,0.012168884,-0.028198242,0.041137695,-0.067871094,-0.032043457,-0.009086609,0.012802124,0.020401001,0.0061798096,-0.008087158,0.012535095,-0.013763428,0.028808594,0.0018234253,-0.042419434,0.006626129,0.018203735,0.04034424,0.046417236,0.014518738,0.015960693,0.0045166016,-0.010284424,-0.05783081,0.016647339,-0.027893066,-0.024765015,0.015991211,-0.0003607273,-0.016525269,0.012954712,-0.03878784,-0.003112793,-0.045837402,0.044921875,0.02078247,0.010925293,0.0063934326,-0.05557251,-0.021331787,-0.001502037,-0.02822876,-0.027313232,-0.0044670105,0.012199402,0.034362793,-0.007648468,-0.023620605,0.0059280396,-0.011108398,-0.02255249,-0.042755127,-0.040039062,0.031921387,-0.02507019,0.02381897,0.034362793,-0.095458984,-0.017288208,-0.05340576,0.0012483597,-0.026168823,-0.0087509155,0.009613037,0.015975952,-0.022628784,-0.014930725,-0.01499176,-0.025543213,-0.0046691895,0.028701782,-0.0050086975,0.03479004,-0.025802612,0.04849243,0.021713257,0.012077332,0.02330017,0.03062439,0.0023403168,-0.09051514,-0.08660889,-0.033599854,-0.007156372,-0.036987305,-0.011779785,0.004085541,-0.011619568,-0.072265625,-0.0231781,-0.00459671,-0.0037155151,-0.039031982,-0.014022827,-0.023376465,0.010040283,-0.018203735,-0.038360596,0.00067329407,-0.013656616,0.0597229,0.009773254,0.026916504,0.03265381,-0.013069153,0.0625,0.034088135,0.0061836243,-0.023986816,0.014060974,-0.027999878,0.02859497,-0.0007414818,0.0048179626,-0.032409668,0.047027588,0.0592041,0.016708374,-0.022766113,-0.014060974,-0.04675293,-0.04156494,-0.02720642,0.0289917,0.025131226,0.0037937164,0.03149414,-0.044952393,-0.023010254,-0.018920898,0.010482788,0.008415222,0.07470703,0.00060510635,-0.0128479,0.025115967,0.018249512,-0.049621582,0.046203613,0.03265381,0.0018396378,-0.010978699,-0.020126343,0.038360596,0.026947021,-0.01953125,0.009513855,-0.028961182,0.03793335,-0.0022525787,-0.0064849854,0.014877319,-0.015625,-0.023773193,-0.026367188,-0.029464722,0.031173706,-0.0035114288,-0.0017795563,-0.026382446,-0.07635498,0.050720215,0.021133423,0.046783447,-0.025115967,0.0077285767,-0.020645142,0.0057296753,-0.06866455,0.07165527,0.08117676,0.016937256,-0.02217102,0.0036239624,-0.00019323826,-0.020126343,0.0029754639,-0.005973816,-0.033996582,-0.008178711,0.031707764,-0.04208374,-0.013267517,0.030456543,0.00856781,0.055419922,-0.025512695,-0.028198242,-0.015991211,-0.009925842,0.0006904602,-0.039978027,-0.007774353,-0.007522583,0.008094788,0.0423584,-0.014144897,0.015853882,-0.011199951,0.0018806458,-0.0058021545,-0.0062294006,-0.02809143,-0.019317627,0.022766113,0.0036888123,-0.06628418,0.021347046,-0.012466431,0.05432129,-0.04095459,0.032409668,-0.0103302,0.013015747,0.041625977,-0.0055885315,-0.04714966,-0.00045466423,0.024139404,0.016906738,0.053222656,0.016021729,-0.035186768,0.004135132,0.07867432,0.0010137558,-0.009529114,-0.004058838,0.0024108887,0.03062439,-0.021514893,-0.0657959,-0.028884888,0.009346008,-0.025634766,0.025466919,-0.019348145,0.021697998,-0.0035743713,0.0066871643,-0.02420044,0.006412506,-0.03012085,0.027999878,-0.023788452,0.016921997,-0.01309967,-0.032836914,0.0021572113,0.015220642,-0.021514893,-0.008850098,0.029281616,0.020248413,-0.029785156,-0.029220581,-0.032104492,-0.0030918121,-0.009887695,0.021484375,0.026794434,0.018875122,0.048797607,-0.027313232,0.004371643,0.025756836,0.018188477,0.030334473,-0.014640808,-0.0016698837,-0.07385254,-0.05267334,-0.024032593,-0.025497437,0.023376465,0.029251099,-0.006149292,0.05456543,0.0031833649,-0.035888672,-0.04537964,0.019760132,-0.03768921,-0.00011968613,0.03125,-0.009338379,-0.03564453,-0.0056495667,-0.006214142,0.0046691895,0.04977417,0.0262146,0.011917114,0.073913574,0.033233643,-0.003522873,0.021881104,0.0045280457,0.033599854,0.019348145,-0.0067634583,-0.036865234,0.003189087,0.03515625,-0.026168823,-0.01966858,-0.06982422,0.07946777,0.037200928,0.07763672,0.025100708,0.008857727,0.03933716,-0.021408081,0.005378723,-0.022094727,-0.02053833,-0.013969421,-0.037872314,0.036376953,-0.008796692,0.0066184998,-0.030349731,0.05090332,-0.00025558472,0.023529053,-0.034576416,0.043273926,0.00035595894,-0.003528595,0.00566864,0.013137817,0.047424316,0.059661865,-0.050109863,0.010139465,0.015792847,-0.0418396,0.0042381287,0.054718018,-0.008491516,-0.013198853,-0.06323242,-0.018478394,-0.0019721985,-0.006629944,-0.047912598,-0.018600464,0.0034065247,0.013587952,0.042510986,-0.030410767,-0.01386261,-0.028259277,-0.026672363,-0.05126953,0.0022468567,-0.061340332,-0.008331299,0.037475586,-0.035339355,-0.027633667,0.006011963,-0.007701874,-0.031707764,0.006164551,0.043945312,-0.005924225,-0.048339844,0.055633545,0.01373291,0.00065135956,0.008682251,0.033935547,0.026123047,0.02746582,0.043029785,0.004245758,-0.015571594,-0.051727295,0.029434204,-0.055999756,0.0069389343,0.0184021,-0.017181396,-0.0076293945,-0.008148193,-0.039245605,-0.031463623,0.021224976,-0.031097412,-0.0016298294,0.012718201,-0.028808594,-0.024139404,-0.064453125,-0.010978699,-0.02104187,0.062805176,0.027542114,-0.0152282715,-0.05328369,-0.0014209747,0.017944336,-0.000030457973,0.04257202,-0.014892578,-0.014823914,-0.0038108826,-0.030548096,-0.0019702911,-0.025344849,0.02935791,-0.000869751,-0.01423645,0.016052246,0.02142334,0.009597778,0.0057296753,0.009719849,0.00945282,-0.031951904,-0.01574707,-0.007129669,0.026733398,0.008766174,0.0076675415,-0.03451538,0.03265381,0.014190674,0.043395996,-0.031280518,-0.0071640015,0.000016272068,0.015853882,0.023651123,-0.016021729,-0.009994507,-0.00970459,-0.051757812,-0.06628418,0.03942871,-0.0362854,0.028808594,0.023986816,0.004585266,0.019088745,-0.02822876,0.011558533,0.030303955,-0.03137207,-0.012702942,-0.022079468,-0.03677368,-0.021087646,0.01058197,-0.019866943,0.014877319,-0.012619019,0.008666992,-0.0059547424,-0.028045654,0.016967773,0.019241333,-0.009292603,0.021469116,-0.0046958923,0.0362854,0.050933838,0.0073127747,-0.03353882,0.020751953,0.003124237,0.011436462,-0.0042533875,0.04623413,0.038848877,-0.011161804,-0.007904053,0.0052108765,-0.008934021,-0.013412476,0.0063934326,0.0012655258,0.0049743652,-0.014839172,-0.034698486,-0.001739502,0.014167786,-0.0234375,-0.023956299,0.025009155,0.012535095,-0.037597656,0.027786255,0.03111267,0.052520752,-0.01802063,0.011024475,0.009300232,0.05126953,0.032562256,0.0019683838,-0.008857727,0.011291504,-0.015991211,0.011001587,-0.018310547,0.010276794,0.023803711,0.00655365,0.0043182373,0.01586914,0.0050239563,-0.018875122,-0.03326416,0.014678955,-0.018569946,-0.023406982,0.013893127,0.014930725,0.020095825,-0.024368286,0.024993896,0.01083374,-0.0071372986,-0.010528564,-0.010383606,0.02557373,-0.010673523,-0.015129089,0.021316528,-0.0010328293,0.010765076,-0.046783447,-0.0115737915,0.013908386,0.017990112,-0.043792725,-0.05505371,-0.041931152,0.008277893,0.038024902,0.0076942444,0.032714844,0.029129028,-0.006679535,0.0023937225,0.023513794,0.009246826,-0.015823364,-0.0059661865,-0.045318604,-0.02104187,-0.008239746,-0.00037789345,-0.036590576,0.0154800415,-0.007167816,-0.02583313,0.009292603,-0.008026123,-0.013801575,-0.010574341,0.0030994415,0.03564453,0.0005636215,0.015426636,-0.024902344,-0.025283813,-0.014564514,0.0042800903,0.0104522705,-0.048675537,0.019714355,-0.009635925,-0.017166138,0.0021190643,0.014099121,0.01826477,0.030776978,0.015113831,0.026473999,-0.056365967,0.056365967,-0.040924072,0.027862549,-0.006099701,-0.033966064,-0.0079422,-0.029388428,-0.010261536,0.042541504,-0.021087646,0.0033226013,-0.040130615,-0.035858154,-0.006134033,-0.050323486,0.0178833,0.040649414,0.04522705,-0.029067993,-0.002084732,0.008232117,0.0059661865,-0.017211914,0.0013027191,0.00051259995,0.018051147,0.027252197,-0.011497498,-0.021881104,-0.028198242,-0.0211792,-0.021499634,-0.053771973,-0.068603516,-0.0056648254,0.011703491,-0.0022602081,-0.0041885376,-0.032104492,-0.034179688,0.0031967163,-0.043060303,0.011245728,-0.005302429,0.010688782,0.0004878044,-0.017959595,0.013435364,0.016082764,-0.033111572,0.045288086,0.010353088,-0.0038528442,-0.03488159,0.0184021,0.015838623,0.015853882,-0.007221222,-0.021255493,-0.009391785,-0.024230957,-0.050231934,-0.005176544,0.0002462864,-0.0062408447,-0.011810303,-0.0032577515,-0.053466797,-0.0026416779,-0.02519226,-0.009109497,0.024230957,0.022583008,0.0021324158,-0.004840851,0.011360168,-0.0008535385,-0.007965088,-0.033477783,0.011734009,0.010612488,0.0011119843,0.029693604,0.041870117,0.0061454773,-0.018676758,0.013999939,0.016998291,0.031555176,-0.016601562,0.0031032562,-0.026885986,0.014915466,-0.0036296844,-0.012886047,-0.0284729,-0.0028076172,0.08105469,0.014930725,-0.019302368,-0.006088257,-0.019058228,0.012794495,0.025054932,-0.05609131,-0.0027599335,-0.03390503,-0.001291275,-0.024337769,0.022079468,0.0005636215,0.015113831,-0.012779236,-0.04751587,-0.010894775,0.010398865,-0.006126404,-0.060760498,-0.019470215,-0.05038452,0.004890442,-0.014862061,-0.019363403,-0.0005478859,-0.000033199787,-0.018539429,-0.07446289,0.02230835,0.04876709,0.0068740845,0.026947021,0.0007686615,0.0027198792,0.020233154,-0.026412964,-0.0041542053,0.023040771,-0.024932861,-0.027160645,-0.023803711,0.020339966,-0.0068588257,-0.002407074,0.0058670044,-0.00699234,0.017837524,0.00856781,0.008811951,-0.009773254,0.02357483,-0.024963379,0.016143799,-0.003768921,-0.00969696,0.028411865,-0.044128418,0.018234253,0.015533447,0.0052604675,0.013694763,0.02571106,0.045440674,-0.039764404,-0.008201599,0.01134491,-0.0064811707,0.025527954,-0.022491455,0.045654297,0.010322571,-0.016601562,0.01777649,-0.011657715,-0.01133728,-0.03265381,-0.03237915,0.02986145,0.011642456,0.008071899,-0.02178955,0.003921509,0.037139893,-0.0027103424,0.013015747,-0.00995636,-0.02142334,-0.027359009,0.006340027,0.0010204315,0.0012645721,-0.0031585693,0.025177002,0.01876831,0.033966064,0.0067481995,-0.0076408386,0.012207031,0.0287323,-0.0036735535,0.0005431175,0.028411865,0.00023043156,0.0009126663,0.017990112,0.002023697,-0.04534912,0.0030288696,-0.025360107,-0.03564453,0.013198853,-0.009429932,-0.025054932,-0.004283905,0.0061187744,-0.0063819885,-0.028335571,0.006046295,-0.04537964,-0.02645874,0.012619019,-0.006000519,0.026779175,0.017654419,0.009422302,-0.0017690659,0.0058021545,0.0574646,0.0071907043,-0.0013113022,0.02809143,0.028411865,0.015640259,-0.03213501,-0.0020256042,-0.015853882,0.007167816,0.00091934204,-0.044128418,0.018997192,0.03741455,-0.033599854,0.015060425,0.014442444,0.007904053,-0.020736694,-0.004131317,-0.0035953522,0.016159058,-0.012390137,0.034362793,-0.047332764,0.016433716,0.0055351257,0.0070648193,-0.02178955,-0.03186035,-0.019500732,0.019378662,-0.0068855286,-0.016143799,0.043151855,-0.0013895035,0.02519226,-0.011169434,-0.010169983,0.017837524,-0.03527832,-0.025604248,0.03250122,-0.014678955,-0.006095886,0.009010315,-0.022735596,0.023330688,-0.03616333,-0.000644207,0.015205383,-0.014427185,-0.010192871,-0.006374359,-0.016784668,0.0056610107,-0.013473511,-0.0059127808,-0.0014944077,0.050201416,0.025344849,0.036621094,0.050964355,0.00920105,-0.0026016235,-0.03866577,-0.015007019,0.0023288727,-0.0121154785,0.021270752,-0.0020885468,0.031921387,0.030334473,0.00040841103,0.024505615,0.039245605,0.023849487,-0.0045394897,0.010612488,-0.022491455,0.016113281,-0.016677856,0.03012085,-0.00035738945,0.043762207,-0.03945923,0.0104522705,0.01737976,0.014808655,-0.025726318,0.042510986,0.062286377,0.019226074,-0.007091522,0.0413208,-0.00058603287,-0.0063667297,-0.013877869,-0.023132324,0.043395996,0.013145447,0.044281006,0.04119873,0.0012073517,0.002729416,0.00749588,-0.024505615,-0.029785156,0.070129395,0.03616333,-0.014167786,-0.011329651,-0.008674622,0.0073661804,-0.039642334,-0.027542114,0.016464233,-0.02104187,-0.004638672,-0.031204224,-0.008682251,-0.010765076,0.003211975,0.013786316,0.015045166,-0.013671875,0.029693604,0.018722534,0.001830101,0.03643799,-0.0042800903,0.035095215,-0.023666382,-0.034301758,0.013092041,0.018585205,-0.0013551712,-0.0056610107,0.015823364,0.011314392,0.04144287,0.03918457,-0.021697998,0.016845703,0.027755737,0.009475708,0.004146576,0.05508423,0.040802002,0.015075684,0.029891968,0.034362793,0.043029785,-0.030563354,0.0015153885,0.0018730164,0.0003733635,-0.016311646,-0.015701294,0.0047798157,-0.004295349,0.016738892,-0.011566162,-0.0072669983,0.0211792,0.017364502,-0.004924774,-0.006412506,-0.011665344,0.007129669,-0.0022907257,-0.002002716,0.02355957,-0.025497437,0.028366089,0.018218994,0.021560669,-0.019195557,0.014877319,-0.0033512115,-0.026473999,-0.015098572,0.029830933,-0.042266846,0.015731812,-0.0025959015,-0.003604889,-0.034240723,0.018234253,0.025482178,0.00028300285,0.034851074,0.015045166,0.00059890747,-0.0016736984,0.01084137,0.007610321,-0.0088272095,-0.0050315857,-0.02684021,0.0284729,0.0345459,0.0028953552,0.021331787,-0.011642456,-0.0035419464,-0.00042557716,-0.01991272,0.0040245056,-0.01058197,-0.022888184,-0.02444458,0.015060425,0.03640747,0.02684021,0.0423584,-0.013061523,-0.015716553,0.013336182,0.035003662,-0.0035057068,0.008361816,-0.0047302246,0.031173706,-0.007873535,0.03894043,0.048675537,0.0129470825,0.04751587,-0.0149002075,-0.0061912537,0.01411438,-0.0041999817,0.028762817,-0.015022278,0.010215759,-0.0015659332,0.034484863,-0.015113831,-0.034454346,0.010803223,-0.017471313,-0.015258789,-0.018707275,0.011306763,0.0022525787,0.022247314,0.04888916,0.02659607,-0.031173706,0.06088257,-0.00016093254,0.045654297,-0.005680084,-0.024841309,0.043182373,0.020446777,0.017410278,0.013389587,0.0104904175,-0.030303955,0.010597229,0.040374756,0.030334473,0.002670288,0.011245728,-0.00016236305,0.03111267,0.0010890961,0.02709961,0.00028467178,0.0030021667,0.0078125,-0.00007587671,-0.010810852,0.0037326813,-0.008483887,-0.0023822784,0.04574585,-0.026672363,-0.008338928,-0.027313232,-0.013710022,0.030227661,-0.0015182495,0.010757446,-0.018218994,-0.030349731,0.012336731,-0.021316528,-0.022232056,0.00868988,0.021072388,-0.05343628,-0.01953125,0.005142212,0.025939941,-0.014877319,0.023590088,0.035736084,-0.009529114,0.0040397644,0.04534912,-0.016815186,0.0259552,-0.009979248,0.019119263,0.043548584,0.0043754578,-0.020019531,-0.0047798157,0.0056991577,-0.015365601,0.02696228,0.02583313,-0.019729614,-0.009796143,0.0009036064,-0.0057868958,-0.014564514,0.002046585,-0.008728027,0.00674057,-0.00944519,-0.008766174,-0.0016956329,0.0076942444,0.012268066,0.008125305,-0.029785156,-0.017593384,0.025268555,0.030883789,0.021697998,-0.028045654,-0.014785767,0.00705719,0.007686615,-0.015098572,-0.019210815,-0.009780884,-0.039520264,0.0093688965,0.022705078,0.012748718,0.012527466,-0.030807495,0.0023422241,0.015808105,-0.0025978088,0.016357422,0.002664566,-0.025543213,0.007347107,-0.011688232,-0.018585205,-0.019973755,-0.011695862,0.015464783,0.030700684,-0.0032863617,-0.026565552,0.025634766,-0.0013284683,0.013259888,-0.0041542053,-0.010040283,0.028121948,-0.011383057,-0.013435364,0.0006299019,0.027709961,-0.01637268,-0.0006108284,-0.007446289,0.031204224,0.042633057,-0.01424408,-0.01687622,0.020248413,0.0135269165,0.016845703,0.04321289,0.0135650635,0.037475586,0.02619934,-0.0057754517,-0.020950317,0.016189575,-0.007549286,-0.021865845,0.014602661,0.0017204285,-0.01386261,0.028656006,-0.0009083748,-0.0059013367,-0.03164673,-0.012893677,-0.010948181,-0.015975952,0.018417358,-0.0034332275,0.024856567,-0.016952515,-0.005306244,-0.002506256,-0.013145447,-0.05050659,-0.0096206665,0.008163452,-0.0073928833,-0.053894043,-0.0029907227,-0.030349731,0.0056610107,-0.014625549,-0.01600647,-0.0031089783,0.032409668,-0.008666992,0.0023822784,-0.013252258,0.025619507,0.019699097,0.000011742115,0.025314331,-0.020523071,-0.01663208,-0.02482605,0.014518738,-0.017089844,0.019439697,0.005203247,0.041931152,0.021896362,-0.0051612854,0.0017557144,-0.0090789795,-0.011444092,-0.013618469,-0.011253357,-0.022262573,0.024627686,0.010795593,-0.008911133,-0.0062446594,0.038879395,-0.018676758,0.0034599304,0.027679443,0.045715332,0.002948761,0.030380249,-0.009567261,-0.0006222725,-0.005268097,0.003610611,-0.015274048,0.009994507,0.027175903,-0.0015544891,0.0025806427,0.005264282,0.018310547,-0.020355225,-0.007774353,0.026062012,0.008575439,-0.0146102905,0.04095459,0.015731812,0.014694214,-0.013244629,-0.019622803,0.016204834,0.049041748,0.018661499,0.015716553,0.0066604614,0.0062408447,-0.021453857,0.010055542,0.0062713623,-0.020263672,-0.038848877,-0.021697998,-0.035095215,0.019424438,0.009437561,0.01197052,-0.0023841858,0.020568848,-0.023010254,-0.03967285,-0.013641357,0.02420044,0.023773193,-0.012214661,-0.017349243,0.0033111572,0.015556335,-0.02418518,-0.0023460388,-0.039642334,-0.035217285,-0.003364563,-0.015625,0.013397217,0.004047394,-0.004501343,0.011077881,-0.005367279,0.0076026917,-0.014892578,0.023880005,-0.017562866,0.010498047,0.014457703,0.009506226,-0.015731812,0.013320923,-0.012466431,0.001077652,0.018753052,-0.014297485,0.016937256,-0.010421753,0.035827637,-0.013626099,0.001080513,0.03414917,-0.0060806274,0.0060310364,-0.029800415,0.0035152435,0.0075683594,0.00089263916,0.046539307,-0.019805908,-0.026031494,0.0025348663,-0.0154953,-0.019866943,-0.0023479462,0.01777649,0.036224365,-0.010002136,0.049591064,-0.0076293945,0.0037250519,0.016143799,0.014930725,-0.017654419,0.009056091,0.040740967,0.011642456,0.006340027,-0.0021476746,0.0022830963,-0.029327393,-0.013786316,0.010688782,-0.00087213516,-0.010803223,0.027130127,0.0066833496,0.042053223,-0.0076828003,0.015365601,0.0135650635,0.0044136047,0.030197144,-0.00053310394,0.03982544,-0.0073928833,-0.0284729,-0.003419876,0.016174316,-0.025222778,0.0071105957,-0.0028305054,-0.00037026405,-0.038330078,0.017242432,-0.0038871765,0.027862549,-0.026382446,0.009986877,-0.02571106,-0.012138367,-0.032928467,-0.02142334,-0.033935547,0.0013122559,0.03274536,0.00491333,0.030776978,0.0012216568,-0.01524353,0.042236328,0.051208496,0.016815186,-0.023895264,-0.02268982,0.006549835,0.0010004044,0.0037059784,0.017501831,-0.026657104,-0.007843018,0.0029582977,-0.017608643,0.016708374,-0.0064582825,0.0063171387,0.021057129,-0.0034885406,-0.008361816,0.035949707,-0.008102417,-0.005744934,0.013671875,0.0031318665,0.046081543,0.017669678,-0.017684937,0.017654419,0.009346008,-0.036590576,0.064208984,-0.009269714,0.03286743,-0.003665924,0.012260437,-0.036834717,-0.019989014,-0.013549805,0.007911682],"createdAt":"2026-04-21T18:32:23.799Z","updatedAt":"2026-04-22T01:02:19.220Z","lastSeenAt":"2026-04-22T01:02:19.220Z","tsv":"'/api/v1/keys/53':106 '/request':19,38 '0.02':18,37,70,137,201 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':131 '16':159 '20':125 '2913':132 '300':152 '6':141 'Base network API' 'USDC API' 'accept':114 'access':112 'address':148 'advertis':120,158 'ai':12,31,57,172 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'amount':123 'analysi':176 'analyt':56,166 'api':5,24,45,83,111 'attach':94 'base':8,27,78,127,134 'broad':50 'broader':156 'call':4,23 'caller':92 'categori':164 'challeng':119 'classif':179 'commit':91 'convers':195 'conversion' 'cover':10,29 'crawl':217 'crypto-gas-estimates' 'data':11,30,55,165,169 'data-analytics' 'decim':142 'detail':207 'document':209 'embed':180 'enabl':44 'endpoint':16,35,53,66,104,160,227 'equal':136 'estim':190 'everi':65 'exact':220 'exampl':212 'exchang':185 'exchange-rates' 'export':170 'feed':184 'financ':13,32,60,181 'finance-price-feeds' 'flat':202 'format':224 'found':214 'four':163 'gas':189 'generat':196 'geocod':193 'geocoding' 'given':138 'header':98 'infrastructur':63,192 'input/output':208 'insight':171 'key':84 'learn':59,174 'limit':87 'list':108 'low payment fee' 'lowpaymentfee.com':39 'machin':58,173 'marketplac':46 'maximum':122 'metric':167 'micropayment API' 'minimum':90 'network':79 'no-auth API' 'offer':48 'openapi':205 'organ':161 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'payment':97,144 'per':3,22,71 'per-request-pricing' 'platform':6,25,157 'post':115 'premium':110 'price':68,183,203 'quot':188 'rate':86,186 'remain':228 'report':168 'request':72,101,116,221 'respons':223 'schema':206 'second':153 'sentiment':175 'serverless API' 'set':51 'settl':73,146 'share':198 'simpli':93 'span':54 'specif':103 'summar':178 'text':177 'timeout':154 'token':187 'unclear':229 'unit':128 'usag':211 'usdc':9,28,75,130,139 'usdc-base' 'util':15,34,64 'valid':194 'validation' 'web3':61,182 'x402':43,96,118 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"db718ba2-59a6-4e83-952a-9851cb92558b","listingId":"73a59db7-92d0-443a-bdff-e54be6a4e6cd","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/keys/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.799Z"}],"sources":[{"listingId":"73a59db7-92d0-443a-bdff-e54be6a4e6cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.799Z","lastSeenAt":"2026-04-22T01:02:19.220Z"}],"details":{"listingId":"73a59db7-92d0-443a-bdff-e54be6a4e6cd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All 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 x402 challenge for /api/v1/keys/53 advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/keys/53"},{"claim":"The platform offers 16+ endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without managing API keys","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) on a pay-per-call basis","Performing utility operations like geocoding, data validation, and format conversion with instant access","Exporting analytics data and generating insights reports via simple HTTP POST calls"],"bestFor":["Developers who want instant, keyless API access with crypto micropayments","AI agents that need to autonomously purchase API calls via x402","Projects on the Base ecosystem looking for USDC-settled utility endpoints"],"notFor":["Users who need high-volume bulk pricing or subscription discounts","Applications requiring detailed SLA guarantees or enterprise support","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.269Z"},"updatedAt":"2026-04-22T01:02:19.220Z"}}