{"id":"d68b3875-2010-4d17-b3af-40d7adc08881","shortId":"evg2L5","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are settled on the Base network using USDC, with a flat price of $0.02 per request. The x402 protocol eliminates the need for API keys, accounts, or rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/133` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page 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 crawled material.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific function of /api/v1/payments/133 ('Premium API Access') is not documented — unclear what it returns","No request body schema or response schema available","No examples of successful responses found in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/133","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/payments/133","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 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and no examples. The specific purpose of the /payments/133 'Premium API Access' endpoint is unclear — it could be a generic demo or a specific service. The docs, pricing, and README pages are all empty (just wallet-connect prompts). 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":"2026-04-19T06:33:22.059Z","embedding":[-0.027404785,-0.03817749,0.036590576,0.018997192,0.0155181885,-0.037017822,-0.017807007,0.03778076,0.0692749,-0.066589355,0.022491455,-0.0501709,-0.034210205,-0.035888672,-0.018539429,0.015014648,0.009559631,-0.000644207,-0.041992188,0.02748108,0.020614624,-0.015350342,-0.026809692,0.02998352,0.00076293945,-0.010787964,-0.0002632141,-0.0012807846,-0.017196655,-0.048553467,0.04257202,-0.025375366,-0.01374054,0.011177063,-0.020217896,-0.01033783,-0.00630188,0.030685425,0.02659607,-0.008895874,-0.0104522705,-0.057647705,0.013069153,-0.007698059,-0.060058594,0.0011253357,0.013832092,-0.020263672,-0.0016345978,0.0012922287,-0.03918457,-0.008041382,-0.006515503,0.0079574585,0.003320694,0.015731812,-0.009284973,-0.007820129,0.01727295,0.016601562,0.0047035217,-0.05960083,-0.018417358,-0.003042221,0.0023231506,0.059906006,-0.010284424,0.03265381,0.0044021606,0.07080078,0.032043457,0.04473877,0.030395508,0.0065193176,0.0006375313,-0.012039185,-0.0014162064,0.056915283,-0.01133728,-0.03060913,-0.0071487427,-0.018615723,-0.050079346,-0.0009198189,-0.013214111,-0.049926758,-0.016494751,0.027557373,-0.023971558,0.029907227,-0.07348633,-0.013206482,-0.018814087,-0.0018386841,0.0037250519,-0.006034851,-0.010406494,0.019363403,-0.006515503,0.015213013,0.0020961761,-0.043670654,0.01184845,0.015533447,0.036193848,0.05178833,0.01625061,0.015548706,0.011459351,0.0033931732,-0.040802002,0.016830444,-0.015586853,-0.015342712,0.014968872,0.0014019012,-0.0072746277,0.0206604,-0.03640747,0.013389587,-0.04953003,0.048339844,0.01260376,0.010658264,0.012802124,-0.04940796,-0.02104187,0.01701355,-0.021347046,-0.009513855,0.015174866,0.009819031,0.026397705,-0.00605011,-0.036712646,0.020141602,-0.018829346,-0.011619568,-0.050598145,-0.030029297,0.04269409,-0.031555176,0.011299133,0.03463745,-0.09320068,-0.012458801,-0.04901123,-0.0027446747,-0.033477783,-0.010955811,0.0102005005,0.020065308,-0.021331787,-0.006462097,-0.023864746,-0.027832031,-0.009849548,0.033966064,-0.010612488,0.04916382,-0.018707275,0.03152466,0.03137207,0.0026245117,0.014732361,0.029083252,-0.0023784637,-0.08062744,-0.07891846,-0.021636963,-0.009963989,-0.024276733,-0.027328491,0.01134491,-0.003742218,-0.08093262,-0.024414062,-0.014511108,-0.006629944,-0.033203125,0.0018234253,-0.033203125,0.01689148,-0.008453369,-0.053466797,-0.019699097,-0.034484863,0.05899048,0.025390625,0.022628784,0.021957397,-0.019577026,0.05618286,0.024795532,-0.009437561,-0.023208618,0.024108887,-0.016937256,0.014671326,0.0021743774,0.015045166,-0.02255249,0.042266846,0.07312012,0.0019550323,-0.021408081,-0.009460449,-0.052520752,-0.048736572,-0.031921387,0.018417358,0.007255554,0.002603531,0.036956787,-0.039642334,-0.023773193,0.008430481,0.013542175,0.0054244995,0.066223145,-0.0005531311,-0.010101318,0.03543091,0.022491455,-0.054595947,0.036010742,0.036254883,0.017318726,-0.014801025,-0.022766113,0.03543091,0.03817749,-0.025726318,0.02003479,-0.024032593,0.025665283,-0.009521484,0.0063476562,0.020385742,-0.01676941,-0.02835083,-0.030014038,-0.026275635,0.023605347,0.004272461,-0.028335571,-0.035583496,-0.079711914,0.054748535,0.031143188,0.03567505,0.0018692017,0.0046081543,-0.02394104,-0.006893158,-0.07751465,0.060699463,0.07147217,0.01222229,-0.012619019,0.019470215,-0.01083374,-0.034851074,0.0062332153,-0.005695343,-0.036071777,-0.0335083,0.028167725,-0.046173096,0.008071899,0.028686523,0.021240234,0.049194336,-0.0048217773,-0.03894043,-0.018371582,-0.0063705444,-0.006549835,-0.037353516,-0.004787445,-0.006175995,0.018493652,0.033111572,-0.00025749207,0.015312195,-0.0035152435,-0.0005431175,-0.0065994263,0.0032787323,-0.017532349,-0.029174805,0.022888184,-0.0026111603,-0.055419922,0.010299683,-0.0037021637,0.0692749,-0.050231934,0.03894043,-0.012382507,0.010116577,0.053497314,-0.012588501,-0.050079346,0.00014936924,0.022766113,0.012390137,0.04940796,0.014213562,-0.030090332,-0.010948181,0.072265625,-0.019729614,-0.0040740967,0.020523071,0.012878418,0.03062439,-0.00299263,-0.05923462,-0.04324341,0.0019226074,-0.028152466,0.031204224,-0.019470215,0.03253174,-0.007911682,0.0067443848,-0.022888184,0.0042877197,-0.031829834,0.012359619,-0.020019531,0.00699234,-0.0143585205,-0.024398804,0.01121521,0.016998291,-0.013916016,0.00869751,0.03970337,0.022109985,-0.006504059,-0.02520752,-0.035980225,-0.0116119385,-0.02116394,0.019378662,0.019943237,0.02961731,0.057739258,-0.039276123,0.00868988,0.030029297,0.009338379,0.036224365,-0.002691269,-0.0036640167,-0.07757568,-0.051605225,-0.02281189,-0.043823242,0.031677246,0.025802612,-0.00026464462,0.057495117,0.01309967,-0.022384644,-0.039276123,0.009712219,-0.0362854,-0.00274086,0.04522705,-0.027557373,-0.032165527,0.006591797,-0.010719299,0.0071258545,0.04071045,0.018478394,0.026748657,0.06652832,0.0362854,0.013534546,0.015266418,0.0065574646,0.032592773,0.009902954,-0.017913818,-0.022262573,-0.013450623,0.036590576,-0.015220642,-0.019592285,-0.053466797,0.07788086,0.040039062,0.08483887,0.02444458,0.004924774,0.040130615,-0.017456055,0.018417358,-0.020553589,-0.02015686,-0.026397705,-0.044158936,0.02848816,-0.0058898926,-0.009048462,-0.020965576,0.028640747,-0.004234314,0.020401001,-0.031219482,0.040527344,-0.01374054,-0.014633179,0.0132369995,0.0118637085,0.05618286,0.052581787,-0.047546387,0.02217102,0.010192871,-0.033416748,0.0053710938,0.031829834,-0.015731812,-0.010574341,-0.050201416,-0.03173828,-0.008407593,-0.0112838745,-0.046081543,-0.0058250427,-0.00076675415,0.016967773,0.031097412,-0.010299683,-0.008010864,-0.012619019,-0.01574707,-0.054656982,-0.004180908,-0.040283203,-0.0037117004,0.029418945,-0.02204895,-0.008468628,-0.0029525757,-0.012229919,-0.008056641,0.02420044,0.03555298,0.006252289,-0.049072266,0.039398193,0.0032844543,0.012428284,0.01574707,0.039764404,0.024932861,0.029052734,0.039398193,0.00907135,-0.0131073,-0.06890869,0.02381897,-0.04434204,-0.002500534,0.024993896,-0.015960693,-0.00630188,-0.020904541,-0.03201294,-0.032104492,0.014915466,-0.020706177,-0.0017547607,0.024963379,-0.022064209,-0.0234375,-0.053863525,-0.022247314,-0.0069999695,0.066711426,0.025375366,-0.0029907227,-0.06384277,-0.006099701,0.016174316,0.008255005,0.034088135,-0.014045715,-0.008804321,-0.014411926,-0.034698486,-0.007965088,-0.019454956,0.021820068,-0.009986877,-0.0026378632,0.009521484,0.016525269,0.025161743,0.0028896332,0.00881958,0.018295288,-0.03503418,-0.0009660721,-0.010269165,0.024505615,0.016281128,0.0012903214,-0.04043579,0.053863525,0.012863159,0.033416748,-0.04232788,-0.007320404,-0.005882263,0.012619019,0.017990112,-0.00894165,-0.010665894,-0.0068244934,-0.049316406,-0.07165527,0.0423584,-0.026107788,0.030761719,0.026306152,0.0044441223,0.027450562,-0.006477356,0.0072746277,0.01676941,-0.022598267,-0.020202637,-0.018920898,-0.032043457,-0.018447876,-0.004421234,-0.02017212,0.020141602,-0.023971558,0.014083862,-0.009490967,-0.026733398,0.02166748,0.0040740967,-0.008880615,0.018707275,0.00333786,0.024871826,0.042877197,0.012748718,-0.03363037,0.02507019,0.014137268,0.002046585,-0.01159668,0.049438477,0.034942627,-0.0138549805,-0.008583069,-0.012413025,-0.012908936,-0.02432251,0.0038928986,0.0020141602,0.0103302,-0.0072250366,-0.04788208,0.009284973,0.007347107,-0.02722168,-0.027374268,0.010116577,0.007972717,-0.03894043,0.020431519,0.018539429,0.05050659,-0.023895264,-0.0021896362,-0.0052375793,0.035827637,0.03050232,0.016189575,-0.010406494,0.020935059,-0.010734558,0.0129470825,-0.006778717,-0.013595581,0.01739502,0.0042419434,0.02142334,0.021881104,-0.00094747543,-0.026489258,-0.039093018,0.0053863525,-0.019134521,-0.029571533,0.017181396,0.015838623,0.026565552,-0.023620605,0.01763916,0.015380859,-0.010070801,-0.020736694,-0.013320923,0.037902832,-0.0054740906,-0.015235901,0.01914978,0.01461792,0.026855469,-0.05633545,-0.002773285,-0.0014772415,0.009399414,-0.02909851,-0.045776367,-0.04196167,-0.0016860962,0.03894043,0.013801575,0.02420044,0.03302002,0.0027236938,0.003118515,0.02104187,0.0030994415,-0.014373779,-0.0143966675,-0.059539795,-0.018615723,-0.015327454,-0.0013132095,-0.03186035,0.016433716,0.00046682358,-0.028945923,0.0127334595,-0.0115737915,-0.006587982,-0.0065956116,0.0036792755,0.047454834,0.0015134811,0.026107788,-0.021072388,-0.04135132,-0.006587982,0.008583069,0.01499176,-0.04815674,0.01222229,-0.010848999,-0.007423401,0.00029492378,0.006767273,0.019424438,0.027679443,0.009666443,0.02822876,-0.043884277,0.04663086,-0.04272461,0.022354126,0.0019721985,-0.02734375,-0.008895874,-0.025360107,-0.015274048,0.04348755,-0.03149414,-0.001461029,-0.03262329,-0.045013428,-0.010597229,-0.053131104,0.0075416565,0.039367676,0.041809082,-0.03314209,0.0020561218,0.0013818741,0.0035152435,-0.012550354,0.010185242,-0.016174316,0.016738892,0.019012451,0.000017225742,-0.018493652,-0.03161621,-0.017868042,-0.0048179626,-0.040527344,-0.047851562,-0.01828003,-0.0010213852,-0.0030956268,-0.013832092,-0.033233643,-0.040222168,-0.0051956177,-0.032318115,0.015159607,0.0015735626,0.015563965,0.011299133,-0.024856567,-0.00048303604,0.016601562,-0.018112183,0.030731201,0.014373779,-0.012390137,-0.046722412,0.0048065186,0.009819031,0.01737976,-0.00983429,-0.011169434,-0.002204895,-0.022766113,-0.0552063,0.0047798157,-0.010406494,-0.008422852,-0.014213562,0.0063934326,-0.048950195,-0.00548172,-0.024032593,0.006450653,0.02355957,0.0234375,0.005783081,0.0018234253,0.020599365,-0.0047950745,-0.007801056,-0.035736084,0.013183594,0.0104522705,0.0038642883,0.03475952,0.041290283,0.00315094,-0.035491943,0.010444641,0.014549255,0.018844604,-0.021621704,0.005596161,-0.02557373,0.013015747,-0.013160706,-0.0107040405,-0.032226562,-0.0012779236,0.08666992,0.0011148453,-0.011360168,-0.01398468,-0.017303467,0.021392822,0.03842163,-0.04309082,-0.010116577,-0.023483276,0.01776123,-0.025466919,0.0010738373,-0.00039076805,0.023406982,-0.01361084,-0.048919678,-0.007904053,-0.010444641,-0.009986877,-0.062927246,-0.03010559,-0.069885254,0.010276794,-0.015457153,-0.018035889,-0.002565384,0.015655518,-0.01878357,-0.073791504,0.0010099411,0.047210693,0.0025081635,0.025634766,-0.00078582764,0.017242432,0.026412964,-0.03503418,0.0016765594,0.025619507,-0.023742676,-0.020187378,-0.0184021,0.024627686,-0.017868042,-0.0069274902,0.011909485,0.0016403198,0.020095825,-0.008132935,0.01272583,-0.010635376,0.026245117,-0.022064209,0.018035889,-0.0043945312,-0.011795044,0.038085938,-0.048614502,0.020736694,0.008705139,-0.008781433,0.0055007935,0.028533936,0.050872803,-0.038391113,-0.015533447,0.021240234,0.017608643,0.03753662,-0.019882202,0.04522705,0.010955811,-0.018234253,0.011436462,-0.013160706,-0.018341064,-0.024490356,-0.026473999,0.030014038,0.000043928623,0.010498047,-0.014175415,0.008850098,0.018798828,0.0027332306,0.008766174,-0.0044021606,-0.024642944,-0.024765015,-0.0014705658,-0.006629944,0.007972717,-0.00333786,0.024368286,0.029800415,0.03616333,0.0030899048,-0.014564514,0.0014648438,0.030685425,-0.014167786,-0.002105713,0.031433105,0.004146576,0.018203735,0.023910522,0.005542755,-0.04534912,-0.01474762,-0.023910522,-0.01864624,-0.0018224716,-0.011161804,-0.012329102,-0.004020691,0.006061554,-0.013427734,-0.028152466,0.007926941,-0.032806396,-0.026306152,-0.0051574707,-0.012397766,0.025024414,0.003206253,0.011199951,0.005367279,-0.010818481,0.040985107,0.003353119,-0.016571045,0.046203613,0.039642334,0.019332886,-0.026626587,-0.008544922,-0.00699234,-0.016586304,0.0013399124,-0.04321289,0.013069153,0.04824829,-0.027450562,0.00674057,-0.0019798279,0.021331787,-0.0026226044,-0.00063467026,-0.0015735626,0.018630981,-0.011833191,0.038238525,-0.04925537,0.02444458,0.010177612,0.0064430237,-0.01713562,-0.008560181,-0.027526855,0.015235901,0.0018024445,-0.008178711,0.053863525,0.0043258667,0.02696228,-0.01725769,-0.029388428,0.014305115,-0.025344849,-0.019989014,0.023849487,-0.0077400208,-0.0077285767,0.016433716,-0.011779785,0.035461426,-0.031143188,0.0105896,0.0110321045,0.0026111603,-0.0063285828,-0.010307312,-0.012268066,-0.0099487305,-0.014137268,0.0021190643,-0.009094238,0.046295166,0.014320374,0.029830933,0.051605225,0.018295288,0.0035762787,-0.03955078,-0.028717041,0.0007915497,-0.021591187,0.014770508,-0.014801025,0.058929443,0.033813477,0.010536194,0.03060913,0.026489258,0.03704834,-0.00021541119,0.009399414,-0.018203735,0.018539429,-0.013061523,0.018539429,0.00074100494,0.039764404,-0.044799805,0.01979065,0.012001038,0.023239136,-0.027267456,0.034210205,0.053466797,0.012664795,-0.0129852295,0.047546387,-0.0037345886,-0.0048713684,-0.009109497,-0.020339966,0.04849243,0.014465332,0.04385376,0.049072266,0.012382507,-0.0024757385,0.0231781,-0.035339355,-0.030792236,0.060180664,0.031173706,-0.025390625,-0.013183594,-0.00039863586,0.0066375732,-0.047546387,-0.024169922,0.027572632,-0.007736206,0.0003092289,-0.0047798157,-0.016143799,-0.011131287,0.0008506775,0.021621704,0.015274048,-0.015342712,0.02935791,0.025299072,0.0010795593,0.037597656,-0.0051727295,0.032318115,-0.021774292,-0.02961731,0.019119263,0.019973755,-0.011932373,-0.01210022,0.030883789,0.0046844482,0.04058838,0.042877197,-0.023651123,0.003194809,0.024475098,0.011131287,-0.00013923645,0.06384277,0.03237915,0.016052246,0.040649414,0.03161621,0.03427124,-0.04147339,0.013832092,0.0031414032,0.0057373047,-0.008171082,-0.010765076,0.00756073,-0.018066406,0.027816772,-0.0021095276,-0.012817383,0.023605347,0.027008057,-0.0043258667,-0.0022773743,-0.008491516,0.0067253113,-0.024963379,-0.0011053085,0.015510559,-0.018188477,0.03857422,0.010688782,0.029876709,-0.02809143,0.023864746,-0.0030403137,-0.01512146,-0.010192871,0.023864746,-0.032196045,0.0074386597,-0.0087509155,0.001657486,-0.047546387,0.018371582,0.032440186,-0.013442993,0.02319336,0.007709503,-0.0020446777,-0.010726929,0.0236969,0.0010271072,0.0017204285,-0.0072631836,-0.023468018,0.02355957,0.042266846,0.0039405823,0.006088257,-0.029769897,-0.0074653625,0.0042304993,-0.009735107,0.00056791306,-0.0098724365,-0.015563965,-0.0137786865,0.013336182,0.029434204,0.021697998,0.04949951,-0.021270752,-0.013282776,0.014564514,0.03515625,0.0033855438,0.00021326542,-0.009254456,0.033325195,-0.018966675,0.038970947,0.039367676,0.009689331,0.0357666,-0.005592346,-0.010848999,0.011795044,-0.008377075,0.027191162,-0.020309448,0.005378723,-0.0014381409,0.031204224,-0.012954712,-0.0345459,0.007873535,-0.010620117,-0.02029419,-0.020751953,0.019577026,0.0008378029,0.029434204,0.040863037,0.02104187,-0.030654907,0.06072998,-0.017929077,0.04284668,0.0010108948,-0.010498047,0.053497314,0.023590088,0.032348633,0.015670776,0.016113281,-0.034942627,0.015197754,0.036224365,0.03173828,0.0067443848,0.011367798,-0.015609741,0.04083252,-0.002380371,0.031799316,-0.008377075,-0.0007195473,0.006767273,-0.0022659302,-0.0069732666,-0.0009841919,-0.009628296,0.008743286,0.043518066,-0.023788452,-0.0065078735,-0.018981934,-0.01146698,0.026046753,-0.010940552,0.0022697449,-0.0047569275,-0.02960205,0.007270813,-0.029266357,-0.026412964,0.012588501,0.021347046,-0.043670654,-0.0069770813,0.0064430237,0.020492554,-0.028411865,0.02859497,0.032714844,0.005836487,0.0075912476,0.049560547,-0.0107040405,0.030960083,-0.015434265,0.032226562,0.03326416,0.013908386,-0.014846802,-0.003030777,0.007820129,-0.008506775,0.014541626,0.034210205,-0.012130737,-0.0024433136,0.001493454,0.00315094,0.00062322617,0.0061302185,-0.006542206,0.0058288574,-0.009811401,-0.01234436,0.0015707016,0.0036087036,0.003194809,0.0006699562,-0.0051841736,-0.010955811,0.011886597,0.03375244,0.019760132,-0.035186768,-0.00667572,0.0038604736,0.013519287,-0.0099105835,-0.009338379,0.0024375916,-0.03918457,0.018478394,0.017593384,0.010238647,0.010238647,-0.034423828,0.0046577454,0.029541016,0.009460449,0.013702393,0.005596161,-0.008293152,0.010696411,-0.009025574,-0.009208679,-0.0046310425,-0.009231567,0.012802124,0.025787354,-0.0074310303,-0.030883789,0.030471802,0.0051727295,0.01134491,-0.0026168823,-0.0076065063,0.026809692,0.00021529198,-0.0005507469,0.0034637451,0.015571594,-0.008331299,-0.009048462,-0.014976501,0.035247803,0.056671143,-0.006919861,-0.007835388,0.018463135,0.019515991,0.016540527,0.040496826,-0.0011901855,0.039276123,0.02330017,-0.018096924,-0.0184021,0.021499634,-0.012916565,-0.026565552,0.017868042,-0.016616821,-0.015548706,0.020568848,0.004638672,0.0039024353,-0.036010742,-0.009086609,-0.008338928,-0.015014648,0.018035889,-0.017700195,0.0103302,-0.023605347,-0.005760193,0.0022563934,-0.022872925,-0.04244995,-0.014976501,0.0031394958,-0.010810852,-0.054534912,0.0075149536,-0.029876709,0.0060653687,-0.019622803,-0.0066947937,-0.015716553,0.018447876,-0.016174316,-0.009178162,0.0018339157,0.027679443,0.02897644,0.0033416748,0.025619507,-0.025970459,-0.021194458,-0.028671265,0.013214111,-0.012916565,0.024795532,-0.0075683594,0.035217285,0.021530151,-0.018051147,-0.002840042,-0.009269714,-0.010414124,-0.014579773,-0.014038086,-0.025131226,0.02166748,0.016235352,-0.009727478,-0.0056610107,0.045532227,-0.02394104,-0.014045715,0.02859497,0.049072266,0.015266418,0.029083252,-0.012138367,-0.004924774,-0.016784668,0.0010328293,-0.019500732,0.0057525635,0.015159607,0.004234314,-0.00390625,0.013389587,0.02268982,-0.01171875,0.002696991,0.03741455,0.014060974,-0.008041382,0.04171753,0.017547607,0.0039596558,-0.011833191,-0.0107421875,0.020996094,0.052825928,0.008293152,0.015045166,-0.00541687,0.0018968582,-0.0073928833,0.015945435,0.021850586,-0.023773193,-0.049224854,-0.013832092,-0.04135132,0.021774292,-0.006072998,0.012809753,-0.010002136,0.014038086,-0.01914978,-0.03616333,-0.014717102,0.029205322,0.016860962,-0.005882263,-0.008506775,0.012435913,0.01197052,-0.035339355,-0.0067443848,-0.041137695,-0.040100098,-0.008735657,-0.015472412,0.020095825,0.017120361,-0.0068893433,-0.0000066161156,-0.0017185211,0.0017528534,0.002658844,0.024963379,-0.009819031,-0.008636475,0.022842407,0.017410278,-0.010154724,0.015510559,-0.006916046,0.00080633163,0.010414124,-0.011222839,0.018447876,-0.018203735,0.036254883,-0.008972168,0.0034637451,0.033691406,-0.010368347,0.0048217773,-0.02696228,0.004550934,0.0050354004,-0.0037841797,0.03604126,-0.030136108,-0.027145386,0.005771637,-0.017745972,-0.025039673,0.0021476746,0.017654419,0.03390503,-0.010696411,0.048614502,-0.016967773,-0.007083893,0.013748169,0.012306213,-0.012794495,0.003868103,0.03262329,0.0047340393,0.0031814575,-0.0018901825,0.00023567677,-0.032470703,-0.016479492,0.009887695,0.0034542084,-0.018707275,0.033599854,0.012969971,0.047302246,-0.01424408,0.016784668,0.016479492,0.0050964355,0.029647827,0.00573349,0.05218506,-0.0067710876,-0.027526855,0.0056533813,0.004283905,-0.02923584,0.0035572052,-0.0038452148,0.0061569214,-0.041290283,0.013534546,-0.011978149,0.02281189,-0.027862549,0.012580872,-0.024993896,-0.0104904175,-0.046569824,-0.01134491,-0.030807495,0.011169434,0.031204224,0.0067253113,0.029388428,0.0032520294,-0.02734375,0.02935791,0.04660034,0.0023880005,-0.030731201,-0.0345459,0.015083313,0.0036258698,0.0018854141,0.0031776428,-0.024368286,-0.014976501,-0.0026111603,-0.015731812,0.0052452087,-0.0052108765,0.022201538,0.012138367,-0.0027313232,-0.002922058,0.024002075,-0.005897522,-0.013519287,0.010559082,0.007949829,0.03579712,0.03665161,-0.021850586,0.020355225,0.016845703,-0.046081543,0.057006836,-0.00086688995,0.026168823,-0.016433716,0.0040626526,-0.038604736,-0.02470398,-0.014808655,0.002702713],"createdAt":"2026-04-18T18:49:29.326Z","updatedAt":"2026-04-24T09:32:19.486Z","lastSeenAt":"2026-04-24T09:32:19.486Z","tsv":"'/api':198 '/api/v1/payments/133':105 '/docs':197 '/pricing':199 '/readme':201 '/request':12,28 '0.02':11,27,76,126,184 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':120 '402':115 '402 payment api' '6':131 'accept':148 'access':111 'account':88 'across':52 'address':139 'advertis':157 'ai/ml':55 'analysi':161 'analyt':54 'api':5,14,21,30,39,86,110 'application/json':153 'attach':94 'avail':228 'base':8,24,67,122,134 'base usdc api' 'base-network' 'beyond':189 'broad':44 'broader':155 'call':4,20 'caller':92 'catalog':45 'challeng':116 'classif':164 'connect':207 'convers':176 'crawl':231 'data':53,178 'decim':132 'detail':214 'document':188,223 'elimin':82 'embed':165 'enabl':38 'endpoint':51,62,103,147,158 'estim':173 'exact':143 'exampl':227 'exchang':168 'extrem':194 'feed':167 'finance/web3':57 'flat':73 'gas':172 'generat':179 'geocod':174 'header':97 'howev':187 'infer':56 'infrastructur':59 'json-response' 'key':15,31,87 'land':191 'limit':91 'list':107 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'made':137 'materi':232 'micropayment api' 'need':84 'network':68 'no-api-key' 'offer':42 'openapi':218 'page':192,202 'pay':2,18,48 'pay per call api' 'pay-per-cal':1,17 'pay-per-request':47 'payment':96,135,144 'per':3,19,49,77 'platform':6,22,40,156 'point':186 'post':149 'post-method' 'premium':109 'price':74,166,185 'prompt':209 'protocol':81 'quot':171 'rate':90,169 'render':204 'request':50,78,100,117,150 'request/response':221 'requir':16,32 'return':113,152 'schema':222 'scheme':145 'sentiment':160 'settl':64 'simpli':93 'sinc':128 'spars':195 'spec':219 'specif':102 'summar':163 'technic':213 'text':162 'token':170 'unit':123 'usag':226 'usd':127 'usdc':70,125,129 'usdc-settlement' 'use':69,130,141 'util':60 'valid':175 'via':9,25 'wallet':208 'x402':10,26,37,80 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"5088e3fd-469d-45f0-ba69-407c32d14f20","listingId":"d68b3875-2010-4d17-b3af-40d7adc08881","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/payments/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:29.326Z"}],"sources":[{"listingId":"d68b3875-2010-4d17-b3af-40d7adc08881","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/133","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:29.326Z","lastSeenAt":"2026-04-24T09:32:19.486Z"}],"details":{"listingId":"d68b3875-2010-4d17-b3af-40d7adc08881","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/133 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/133"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/payments/133"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/133"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing","Testing x402 payment flows on Base network"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents that need keyless, instant API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["High-volume production workloads needing documented SLAs and detailed schemas","Users who need comprehensive API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.758Z"},"updatedAt":"2026-04-24T09:32:19.486Z"}}