{"id":"256d21b4-b057-400c-b600-73f293fee56b","shortId":"7Qbh9K","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each request costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/apikeys/42` is listed as \"Premium API Access\" and follows the same x402 payment flow.\n\nThe platform advertises endpoints in four categories: (1) Data & Analytics — metrics, reports, data export, and insights; (2) AI & Machine Learning — sentiment analysis, text summarization, classification, and embeddings; (3) Finance & Web3 — price feeds, exchange rates, token quotes, and gas estimates; (4) Infrastructure — geocoding, validation, conversion, and generation utilities. All endpoints use the x402 exact-payment scheme, accepting USDC (contract 0x8335…2913) 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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what response to expect for this particular path.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","crypto API gateway"],"warnings":["No OpenAPI spec or machine-readable schema available","Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no content","The specific endpoint /api/v1/apikeys/42 is not listed among the advertised API catalog — its exact functionality is unclear","No request body schema or response format documented anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/42","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/apikeys/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page describes the catalog and pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of /api/v1/apikeys/42 is unclear beyond the label 'Premium API Access'. 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":"2026-04-19T15:16:43.723Z","embedding":[-0.016693115,-0.0256958,0.03488159,0.022201538,0.036956787,-0.030380249,-0.024871826,0.045715332,0.06427002,-0.063964844,0.02017212,-0.0519104,-0.018341064,-0.032073975,-0.030014038,0.011184692,-0.009361267,0.0066947937,-0.04437256,0.04260254,0.036621094,-0.018493652,-0.01386261,0.03050232,0.0011444092,-0.018997192,-0.0019836426,-0.017654419,-0.021072388,-0.0390625,0.040802002,-0.022415161,-0.0027637482,0.025909424,-0.0042037964,-0.023986816,0.009666443,0.031402588,0.039093018,-0.012687683,-0.003364563,-0.0592041,0.0029201508,0.0152282715,-0.057403564,-0.009094238,0.0048675537,-0.025482178,-0.0055160522,0.0012626648,-0.029342651,-0.0043029785,-0.020629883,-0.0007624626,0.012863159,0.019515991,-0.011665344,-0.02482605,0.010559082,0.002878189,0.006778717,-0.04458618,-0.010688782,0.0027046204,-0.00065517426,0.04296875,-0.0010690689,0.045135498,0.010421753,0.051940918,0.059265137,0.056427002,0.021255493,0.010803223,0.018127441,-0.0053710938,-0.01763916,0.06665039,-0.015281677,-0.009895325,-0.005706787,0.0017461777,-0.049194336,-0.0036678314,-0.028121948,-0.05807495,-0.0063476562,0.01600647,-0.018753052,0.037963867,-0.070007324,-0.009231567,-0.01914978,0.0036182404,0.013198853,-0.0001502037,-0.015533447,0.017608643,-0.01687622,0.0146865845,-0.0009851456,-0.041900635,0.005256653,0.017471313,0.060180664,0.044128418,0.01739502,0.022323608,-0.004337311,-0.014427185,-0.037841797,0.007873535,-0.020889282,-0.023269653,0.013442993,0.021133423,-0.019638062,0.016983032,-0.020935059,0.009300232,-0.05731201,0.053466797,0.019180298,-0.0036392212,0.0178833,-0.04498291,-0.011268616,0.014549255,-0.04006958,-0.01335144,0.02330017,0.01247406,0.036987305,-0.02029419,-0.024368286,-0.00042009354,-0.0025177002,-0.01235199,-0.04550171,-0.03652954,0.036743164,-0.034484863,0.034210205,0.032287598,-0.0947876,-0.01902771,-0.0569458,0.0069732666,-0.031204224,-0.00053310394,0.0011034012,0.020233154,-0.035858154,-0.017303467,-0.013954163,-0.018234253,-0.01309967,0.03503418,-0.0074653625,0.03366089,-0.0072746277,0.053100586,-0.0019302368,0.00081825256,0.027755737,0.038848877,-0.013801575,-0.08721924,-0.091430664,-0.043273926,-0.0035915375,-0.031463623,-0.02772522,-0.00001603365,-0.00548172,-0.07678223,-0.008033752,-0.007820129,-0.0067100525,-0.034301758,-0.02079773,-0.02394104,0.008285522,-0.00522995,-0.044799805,-0.025970459,-0.030151367,0.06616211,0.022201538,0.011917114,0.023513794,-0.008583069,0.0546875,0.015525818,-0.012397766,-0.036254883,0.004901886,-0.026763916,0.029525757,0.0062942505,0.006542206,-0.032562256,0.028839111,0.061767578,0.013137817,-0.009483337,-0.007331848,-0.04727173,-0.05633545,-0.02357483,-0.00012552738,-0.0052490234,0.0027198792,0.049835205,-0.046661377,-0.040527344,-0.00881958,0.00674057,0.018630981,0.070373535,0.0026569366,-0.011428833,0.016525269,0.013824463,-0.04119873,0.04296875,0.041748047,0.0152282715,-0.025222778,-0.024246216,0.028808594,0.040863037,-0.036346436,0.016479492,-0.019744873,0.021896362,0.007598877,0.0047302246,0.026626587,-0.013313293,-0.020401001,-0.028549194,-0.007144928,0.04385376,0.00818634,-0.022644043,-0.03930664,-0.07684326,0.028045654,0.025100708,0.051879883,-0.010765076,0.009361267,-0.020874023,-0.0035572052,-0.0647583,0.047729492,0.08123779,-0.02507019,-0.01436615,0.01525116,-0.013175964,-0.028045654,-0.012550354,0.003080368,-0.03387451,-0.022705078,0.023880005,-0.035217285,-0.010482788,0.013458252,0.02909851,0.047332764,-0.010169983,-0.04348755,-0.037841797,-0.0022335052,-0.0013856888,-0.041046143,0.002544403,0.0026683807,0.009750366,0.04751587,-0.0075416565,0.02986145,0.0003299713,0.020843506,-0.005558014,-0.020584106,-0.040771484,-0.02319336,0.015380859,0.0024337769,-0.0574646,0.020370483,-0.009788513,0.070251465,-0.033111572,0.02909851,-0.015533447,0.030166626,0.037994385,-0.007904053,-0.046844482,0.011398315,0.039855957,0.01763916,0.03289795,0.00894165,-0.011199951,-0.00642395,0.055725098,-0.01651001,0.0015459061,0.0077171326,0.015304565,0.029342651,-0.009429932,-0.06323242,-0.038604736,-0.024810791,-0.047424316,0.024932861,-0.03918457,0.02330017,-0.013198853,0.007663727,-0.029022217,0.008483887,-0.043548584,0.028701782,-0.0234375,0.0048713684,-0.006713867,-0.0309906,0.025283813,0.030380249,-0.032104492,-0.005241394,0.03894043,0.026672363,-0.012039185,-0.043060303,-0.014404297,-0.008743286,-0.01751709,0.0038909912,0.033447266,0.013160706,0.049987793,-0.033996582,0.009292603,0.01713562,0.008712769,0.04647827,-0.010665894,0.004989624,-0.061065674,-0.046081543,-0.03262329,-0.04119873,0.019500732,0.014572144,0.0032901764,0.04348755,-0.0059661865,-0.012321472,-0.04547119,0.006958008,-0.043792725,-0.01184082,0.03225708,0.0016994476,-0.044281006,-0.011871338,0.0022888184,0.0076141357,0.023803711,0.0021820068,0.021087646,0.07366943,0.042816162,0.0025939941,0.024597168,0.0031375885,0.020706177,0.00459671,-0.029815674,-0.032226562,0.020996094,0.01638794,-0.022476196,-0.018692017,-0.064941406,0.061767578,0.037841797,0.054473877,0.011657715,0.018081665,0.03451538,-0.025466919,0.0011358261,-0.016067505,-0.009590149,-0.018173218,-0.04144287,0.032287598,-0.013381958,-0.012565613,-0.01663208,0.038848877,-0.01576233,0.011291504,-0.02861023,0.055786133,-0.0046424866,-0.007827759,0.0236969,0.007633209,0.047088623,0.0435791,-0.04940796,0.016326904,0.016067505,-0.04421997,0.0018339157,0.039245605,-0.009727478,-0.024047852,-0.054382324,-0.038604736,-0.0044288635,-0.012451172,-0.046051025,-0.007183075,0.008560181,0.018432617,0.030792236,-0.026351929,-0.01864624,0.003314972,-0.023284912,-0.06561279,-0.0115737915,-0.05581665,-0.0005068779,0.023498535,-0.038238525,-0.009109497,0.002149582,0.004184723,-0.010322571,0.022705078,0.016860962,0.0013465881,-0.05859375,0.032562256,0.0127334595,0.0046043396,0.01612854,0.03262329,0.034942627,0.0049819946,0.05444336,0.015609741,-0.028137207,-0.04800415,0.009292603,-0.041625977,0.0060195923,0.009010315,-0.021575928,-0.012359619,-0.010856628,-0.02255249,-0.0289917,0.008483887,-0.024749756,0.017578125,0.032409668,-0.04373169,-0.019714355,-0.08227539,-0.017196655,-0.013252258,0.062042236,0.013580322,-0.0014324188,-0.041625977,-0.015174866,0.0118637085,-0.0076522827,0.027572632,-0.013877869,-0.017608643,-0.00003439188,-0.03543091,-0.0063972473,-0.03894043,0.023452759,-0.003479004,-0.0065078735,0.018295288,0.018585205,0.0004787445,-0.0020275116,0.009933472,0.027679443,-0.018615723,-0.015365601,-0.022399902,0.02003479,0.006526947,-0.0031814575,-0.036376953,0.05050659,0.017944336,0.03829956,-0.03765869,-0.0019388199,0.0038394928,0.0035076141,0.024169922,-0.012214661,-0.01210022,-0.0033664703,-0.0491333,-0.062408447,0.027404785,-0.02255249,0.027404785,0.007881165,0.005592346,0.018005371,-0.015281677,0.005001068,0.02696228,-0.032684326,-0.007858276,-0.033843994,-0.025802612,0.0026760101,0.003566742,-0.02230835,0.021209717,-0.021011353,-0.0082473755,-0.0066452026,-0.020111084,0.038269043,0.014404297,-0.008781433,0.02406311,0.0068244934,0.029403687,0.049804688,0.004322052,-0.027786255,0.022781372,-0.0001963377,-0.0019035339,-0.01675415,0.042785645,0.02432251,-0.022384644,-0.0079574585,-0.0024032593,-0.014472961,-0.022003174,-0.005794525,0.006259918,0.022445679,0.0040779114,-0.044708252,0.021606445,0.014198303,-0.035003662,-0.020202637,0.016189575,0.014953613,-0.030960083,0.031707764,0.02986145,0.052703857,-0.013504028,0.0074157715,0.013648987,0.034606934,0.03540039,0.01071167,-0.018325806,0.0049095154,-0.0069007874,0.013160706,-0.01083374,-0.008155823,0.025268555,-0.005947113,0.018814087,0.030319214,0.01927185,-0.03149414,-0.026657104,0.0034446716,-0.008338928,-0.013893127,0.02885437,0.0309906,0.010948181,-0.022735596,0.02557373,0.019012451,-0.03173828,-0.017196655,-0.015151978,0.051361084,-0.016342163,-0.01007843,0.023895264,-0.0064315796,0.018722534,-0.04824829,-0.007774353,0.014907837,0.025299072,-0.029556274,-0.042755127,-0.04019165,-0.0032634735,0.033111572,0.010429382,0.032958984,0.024871826,0.005203247,0.000705719,0.031066895,-0.0009212494,-0.014762878,-0.014381409,-0.04159546,-0.0059928894,-0.000015258789,0.003408432,-0.032287598,0.020309448,-0.019073486,-0.03237915,0.00021409988,-0.008087158,-0.010910034,-0.013519287,0.021575928,0.026672363,0.011398315,0.01689148,-0.022323608,-0.019683838,0.012588501,0.010665894,0.00680542,-0.04574585,0.025283813,-0.014228821,-0.001168251,-0.012207031,0.015197754,0.028060913,0.022598267,0.0048294067,0.03366089,-0.02885437,0.041870117,-0.040740967,0.019989014,0.0044441223,-0.03488159,-0.005142212,-0.025436401,-0.015281677,0.03277588,-0.02986145,-0.005619049,-0.021606445,-0.026672363,-0.018432617,-0.04232788,0.02796936,0.03878784,0.043151855,-0.030838013,-0.0006971359,-0.004966736,-0.0005044937,-0.025619507,0.007698059,-0.0031986237,0.028015137,0.016708374,0.00592041,-0.020202637,-0.021530151,-0.01158905,-0.0043563843,-0.03930664,-0.040527344,-0.010749817,0.008514404,-0.007965088,-0.0021018982,-0.032836914,-0.032836914,0.008384705,-0.03805542,0.0044441223,0.006465912,0.013931274,0.008651733,-0.0065307617,0.002922058,0.024810791,-0.026046753,0.025665283,-0.010467529,-0.007820129,-0.04473877,-0.00033044815,0.049316406,0.018096924,-0.0021247864,-0.020736694,-0.0063171387,-0.013801575,-0.049865723,-0.017959595,0.0000121593475,0.005874634,0.004447937,-0.0023078918,-0.051086426,-0.016281128,-0.025939941,-0.006752014,0.026184082,0.03744507,0.010971069,-0.012336731,0.012779236,-0.0014600754,-0.006210327,-0.037231445,0.002609253,0.010116577,0.0038108826,0.017684937,0.05166626,0.011878967,-0.020248413,0.007537842,-0.0044403076,0.0126571655,-0.011436462,0.006690979,-0.024398804,0.012367249,-0.00248909,-0.022216797,-0.041992188,-0.012641907,0.08392334,-0.00020182133,-0.0033130646,-0.00009059906,-0.016723633,0.020095825,0.033355713,-0.055725098,-0.01184082,-0.038116455,0.017349243,-0.021148682,0.022521973,0.0011796951,0.013175964,-0.012779236,-0.05895996,-0.007663727,-0.000541687,-0.009124756,-0.06378174,-0.023330688,-0.06085205,-0.003276825,-0.0009059906,-0.025390625,-0.0051498413,0.00945282,-0.017684937,-0.07885742,0.008201599,0.050109863,0.011878967,0.028945923,-0.021575928,0.012397766,0.02960205,-0.028549194,-0.013618469,0.030639648,-0.031341553,-0.025863647,-0.029510498,0.02670288,-0.017028809,-0.009735107,0.025466919,0.009849548,0.025054932,-0.0077285767,0.01979065,-0.0035572052,0.018051147,-0.019866943,0.011161804,-0.006713867,0.0006289482,0.026763916,-0.041870117,0.016143799,0.022949219,0.0018005371,0.002231598,0.032714844,0.03543091,-0.042999268,-0.013137817,0.019958496,0.013710022,0.040252686,-0.023925781,0.05331421,0.02003479,-0.017532349,0.024261475,-0.009979248,-0.024261475,-0.04647827,-0.032043457,0.0234375,0.014442444,0.026367188,-0.0041160583,-0.0035915375,0.030151367,-0.009994507,0.017120361,-0.021438599,-0.009559631,-0.020492554,0.0015239716,0.00018942356,-0.0007095337,0.0032634735,0.033081055,0.028839111,0.039764404,0.013015747,-0.005924225,0.009132385,0.026855469,-0.012619019,-0.0011034012,0.021148682,0.011680603,0.016052246,0.013465881,0.012527466,-0.04727173,-0.018447876,-0.041229248,-0.011222839,-0.00034713745,-0.014595032,-0.011543274,-0.0084991455,-0.0033550262,-0.0023517609,-0.032470703,0.017471313,-0.04168701,-0.023086548,-0.012710571,-0.017715454,0.021453857,0.010231018,0.0047569275,0.020599365,-0.0009703636,0.0657959,0.007850647,0.007835388,0.022399902,0.030426025,0.022109985,-0.034484863,-0.009094238,-0.0073127747,0.005794525,0.006374359,-0.027267456,0.019378662,0.03756714,-0.026245117,0.0060806274,0.0007019043,0.025466919,-0.016098022,-0.0052833557,-0.011276245,0.021087646,-0.01763916,0.033843994,-0.04626465,0.0072784424,0.013748169,0.0027103424,0.009536743,-0.018585205,-0.030838013,0.007827759,-0.002046585,-0.016952515,0.04827881,-0.0057907104,0.030960083,-0.026916504,-0.022155762,0.003921509,-0.031402588,-0.022903442,0.037109375,-0.009269714,-0.003435135,0.018508911,-0.025665283,0.03475952,-0.027679443,0.017089844,0.013824463,0.0019435883,-0.011459351,-0.011352539,-0.017364502,-0.0044670105,-0.0032730103,-0.012542725,-0.0011587143,0.052368164,0.027114868,0.026519775,0.046661377,0.0103302,0.0019111633,-0.046142578,-0.026992798,-0.00166893,-0.018218994,0.011878967,-0.011459351,0.057617188,0.04348755,-0.0014362335,0.029785156,0.042022705,0.032684326,0.0018186569,0.0053138733,-0.019256592,0.019607544,-0.012870789,0.03152466,0.009902954,0.034240723,-0.03149414,0.008132935,0.012359619,0.013015747,-0.017578125,0.037200928,0.066833496,0.026367188,-0.0033988953,0.029525757,-0.008964539,-0.0051078796,-0.016983032,-0.011138916,0.066589355,0.0029029846,0.05303955,0.047851562,0.0075950623,0.005050659,0.024429321,-0.027328491,-0.022216797,0.07336426,0.014289856,-0.0289917,-0.00969696,-0.0026340485,-0.0013856888,-0.03829956,-0.02659607,0.01889038,0.0053520203,0.0054473877,-0.005420685,-0.006778717,-0.018127441,0.0045776367,0.019866943,0.008544922,-0.011459351,0.019256592,0.020904541,0.011955261,0.014839172,-0.0076522827,0.032409668,-0.028274536,-0.023025513,0.014160156,0.01663208,-0.0022220612,-0.005405426,0.016921997,0.010925293,0.04473877,0.039642334,-0.025726318,0.003900528,0.020614624,0.021942139,0.010513306,0.054748535,0.031097412,0.01020813,0.03503418,0.04119873,0.030380249,-0.03591919,0.012619019,0.007774353,0.0019893646,-0.011634827,-0.021118164,-0.0063476562,-0.010223389,0.016494751,-0.0051345825,-0.011375427,0.032104492,0.014419556,-0.003194809,0.009170532,-0.010917664,0.013389587,-0.025344849,0.0003979206,0.020614624,-0.011558533,0.02885437,0.015007019,0.018737793,-0.033477783,0.02015686,-0.006919861,-0.017471313,-0.00566864,0.017288208,-0.041412354,-0.0009841919,-0.0055274963,-0.003921509,-0.04837036,0.008171082,0.028808594,-0.018493652,0.031677246,0.01159668,-0.009239197,-0.0045928955,0.026031494,0.0055351257,-0.0036392212,-0.007255554,-0.030685425,0.024337769,0.036010742,-0.00015473366,0.018066406,-0.01979065,-0.0028133392,0.00052547455,-0.017425537,0.0041007996,-0.005344391,-0.03543091,-0.027160645,0.012252808,0.0368042,0.022842407,0.03326416,-0.011161804,-0.024810791,0.0107040405,0.021575928,0.012260437,0.0131073,-0.004463196,0.030715942,-0.012138367,0.04916382,0.038146973,0.0012102127,0.012901306,-0.01576233,-0.017791748,0.009941101,-0.015792847,0.022125244,-0.01777649,0.013916016,-0.004711151,0.030380249,-0.01171875,-0.034088135,0.007499695,-0.0110321045,-0.013465881,-0.029708862,0.021240234,-0.0010023117,0.035980225,0.047821045,0.027679443,-0.036102295,0.0552063,-0.019714355,0.046691895,-0.011352539,-0.012893677,0.051727295,0.029815674,0.03930664,0.017486572,0.016479492,-0.025344849,0.015174866,0.056274414,0.017822266,0.0039863586,-0.0038261414,-0.02619934,0.0335083,0.0103302,0.039489746,-0.0104522705,-0.0062942505,0.00086832047,-0.009529114,-0.014022827,-0.002040863,-0.0023155212,0.0041389465,0.051605225,-0.025863647,-0.024734497,-0.028915405,-0.011833191,0.027069092,-0.007511139,0.00029087067,-0.0019350052,-0.032470703,0.012840271,-0.02407837,-0.0027599335,0.011726379,0.031066895,-0.052856445,-0.026428223,0.013618469,0.018051147,-0.035369873,0.020202637,0.0309906,-0.004436493,0.0077667236,0.037628174,-0.0069274902,0.04095459,-0.002828598,0.026809692,0.0385437,0.0060195923,-0.017837524,0.009880066,0.012504578,-0.0068359375,0.004131317,0.031585693,-0.009231567,0.010101318,0.0008940697,-0.011314392,-0.0007328987,0.0127334595,-0.0007596016,-0.00033974648,-0.001991272,-0.0008940697,-0.0006585121,0.007183075,0.006477356,0.016693115,-0.009468079,-0.014831543,0.009887695,0.035583496,0.010055542,-0.03967285,0.0029182434,0.011672974,0.0042800903,-0.013420105,-0.015403748,-0.018753052,-0.029296875,0.014442444,0.028701782,0.004383087,0.0006418228,-0.019226074,-0.0023479462,0.022033691,0.01222229,-0.0010089874,-0.0044403076,-0.015151978,0.00077962875,-0.022216797,-0.006061554,-0.009971619,-0.018096924,0.016357422,0.024291992,-0.0016946793,-0.027816772,0.026885986,0.0056610107,0.009056091,-0.007297516,-0.009231567,0.015975952,-0.020736694,-0.013702393,-0.003850937,0.02154541,-0.012001038,-0.022323608,-0.0181427,0.027908325,0.05279541,-0.013954163,-0.016433716,0.01586914,0.003446579,0.024490356,0.03378296,0.007156372,0.04248047,0.023529053,-0.013328552,-0.021331787,0.016784668,-0.017318726,-0.027404785,0.015419006,-0.0021877289,-0.009407043,0.021743774,0.006996155,-0.016708374,-0.024551392,-0.022521973,-0.0029830933,-0.021575928,0.023361206,-0.007865906,0.01965332,-0.019134521,-0.00655365,0.008232117,-0.009391785,-0.043304443,-0.015037537,-0.014480591,-0.015731812,-0.054901123,0.003501892,-0.028274536,0.010017395,-0.023956299,0.000647068,-0.0014190674,0.03012085,-0.017105103,0.004398346,0.00029945374,0.022705078,0.023605347,0.0004029274,0.01638794,-0.026275635,-0.023330688,-0.027236938,0.0036888123,-0.013595581,0.019882202,0.010803223,0.051574707,0.0132369995,-0.009628296,-0.0048713684,-0.012954712,-0.003074646,-0.018661499,-0.012016296,-0.030685425,0.019836426,0.016235352,0.0024414062,-0.004753113,0.036376953,-0.033111572,-0.015571594,0.014831543,0.045288086,-0.005302429,0.034088135,-0.015602112,-0.00035381317,-0.01991272,-0.006668091,-0.015991211,0.00894165,0.007484436,0.005882263,-0.0057144165,-0.014533997,0.017242432,-0.016143799,-0.008216858,0.025863647,-0.00042319298,-0.020690918,0.036224365,0.018707275,0.006729126,-0.014328003,-0.012397766,0.016799927,0.036956787,0.012519836,0.00592041,-0.0018749237,0.017822266,-0.016342163,0.007873535,0.0034160614,-0.020095825,-0.03768921,-0.027679443,-0.045166016,0.022872925,0.006465912,0.017166138,-0.0042037964,0.022460938,-0.01852417,-0.030273438,-0.009384155,0.024551392,0.007896423,-0.020950317,-0.007843018,0.0032253265,0.019332886,-0.018341064,-0.000374794,-0.046905518,-0.034576416,-0.013183594,-0.020401001,0.022064209,0.0025863647,-0.0008544922,0.0076141357,0.0017490387,0.0116119385,-0.001452446,0.035858154,0.0021896362,0.0025024414,0.0071525574,0.009933472,-0.025665283,0.01348114,-0.004585266,-0.010658264,0.018295288,-0.01033783,0.013114929,-0.015197754,0.032928467,-0.0017585754,-0.0036182404,0.037200928,0.009590149,0.020858765,-0.025650024,-0.0078048706,0.00806427,0.00078725815,0.032348633,-0.022949219,-0.024841309,0.015670776,-0.024032593,-0.030654907,0.010322571,0.022125244,0.032958984,-0.01058197,0.029251099,-0.006931305,-0.0050239563,0.021102905,0.006454468,-0.015213013,-0.0043182373,0.04525757,-0.00028395653,-0.0057373047,0.00033640862,-0.0059776306,-0.019088745,-0.010948181,0.0138168335,-0.010917664,-0.015991211,0.02468872,0.011390686,0.038330078,0.011505127,0.01626587,0.016967773,0.009529114,0.0262146,0.0042266846,0.035186768,0.0025749207,-0.028121948,0.0070991516,0.014587402,-0.010345459,0.0030593872,-0.00006824732,0.0036621094,-0.03955078,0.014442444,0.001543045,0.034820557,-0.014930725,0.011512756,-0.022521973,-0.01247406,-0.030883789,-0.009902954,-0.041778564,0.011314392,0.045898438,0.008094788,0.01713562,0.0037498474,-0.023986816,0.03555298,0.057678223,-0.0020046234,-0.028381348,-0.008110046,-0.0018148422,-0.01084137,-0.01928711,0.009643555,-0.01171875,-0.013893127,0.0013360977,-0.032592773,0.01676941,-0.002811432,0.009506226,-0.0024719238,-0.009010315,-0.00919342,0.016555786,-0.004585266,0.0012168884,0.008857727,-0.0018281937,0.034851074,0.025772095,-0.011962891,0.019973755,0.031280518,-0.03857422,0.051086426,-0.015403748,0.016235352,-0.019500732,0.0063323975,-0.040222168,-0.0206604,-0.020690918,0.002714157],"createdAt":"2026-04-18T19:29:30.215Z","updatedAt":"2026-04-22T05:31:51.753Z","lastSeenAt":"2026-04-22T05:31:51.753Z","tsv":"'/api':167 '/api/v1/apikeys/42':84 '/docs':166 '/pricing':168 '/readme':170 '0.02':9,22,58 '0x8335':157 '1':105 '2':114 '2913':158 '3':125 '4':137 '402':209 'Base network API' 'USDC API access' 'accept':154 'access':3,16,90 'across':46 'advertis':100 'ai':115 'ai-inference' 'ai/ml':49 'analysi':119 'analyt':48,107 'api':2,15,33,71,89 'avail':197 'base':8,21,63,160 'bodi':221 'broad':38 'call':44 'catalog':39 'categori':104 'chain':68 'challeng':210 'classif':122 'classification' 'commit':79 'confirm':204 'connect':176 'contract':156 'convers':141 'cost':57 'crawl':200 'crypto API gateway' 'crypto-quotes' 'data':47,106,110 'data-analytics' 'detail':183 'difficult':216 'document':161,192,213 'embed':124 'embeddings' 'enabl':32 'endpoint':45,82,101,146,202 'estim':136 'exact':151 'exact-pay':150 'exampl':196 'exchang':130 'expect':228 'export':111 'extrem':163 'feed':129 'financ':126 'finance-data' 'finance/web3':51 'flow':97 'follow':92 'four':103 'gas':135 'generat':143 'geocod':139 'geocoding' 'infer':50 'infrastructur':53,138 'insight':113 'key':72 'know':218 'learn':117 'limit':75 'list':86 'live':205 'lowpaymentfee' 'lowpaymentfee.com':27 'machin':116 'metric':108 'micropay':6,19 'micropayment API' 'network':64 'offer':36 'on-chain':66 'openapi':187 'page':171 'particular':231 'path':232 'pay':42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':96,152 'per':10,23,43 'platform':34,99 'premium':1,14,88 'price':128 'prompt':178 'proper':208 'quot':133 'rate':74,131 'render':173 'report':109 'request':11,24,56,220 'request/response':190 'respons':226 'return':206 'schema':191 'scheme':153 'send':223 'sentiment':118 'sentiment-analysis' 'settl':65 'spars':164 'spec':188 'specif':81 'summar':121 'technic':182 'text':120 'text-summarization' 'token':132 'upfront':78 'usag':195 'usdc':13,26,60,155 'usdc-base' 'use':147 'util':54,144 'utility-apis' 'valid':140 'via':4,17 'wallet':177 'web3':127 'without':212 'x402':5,18,31,95,149 'x402 API' 'x402-enabled':30 'x402-payment'","prices":[{"id":"4c03115e-8378-4b6e-842a-682cf01ebca3","listingId":"256d21b4-b057-400c-b600-73f293fee56b","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/apikeys/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:30.215Z"}],"sources":[{"listingId":"256d21b4-b057-400c-b600-73f293fee56b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:30.215Z","lastSeenAt":"2026-04-22T05:31:51.753Z"}],"details":{"listingId":"256d21b4-b057-400c-b600-73f293fee56b","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/apikeys/42 \\\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 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/apikeys/42"},{"claim":"All listed APIs cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/42"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto price feeds and gas estimates with per-call USDC payments","Running geocoding or data validation utilities on a pay-as-you-go basis","Exporting analytics data or generating reports via micropayment-gated endpoints"],"bestFor":["Developers who want instant API access without registration or API keys","Agents and bots that can settle x402 payments autonomously on Base","Low-volume or sporadic usage where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request crypto settlement adds latency and cost overhead","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.148Z"},"updatedAt":"2026-04-22T05:31:51.753Z"}}