{"id":"1db7e180-a4d1-478f-9806-c0ce3e75a026","shortId":"jfh5Fj","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/transactions/10` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call.\n\nThe platform advertises four categories of APIs: 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 endpoints follow the x402 payment protocol — callers send an `X-PAYMENT` header containing a signed payment proof, and the server fulfills the request upon verification.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 example payloads available. The actual behavior and output format of each endpoint — including the `/api/v1/transactions/10` endpoint being listed here — cannot be verified from the crawled material alone.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee API","x402 API platform","pay-per-call API","USDC micropayment API","Base network API","crypto-paid API","402 payment API"],"warnings":["No OpenAPI specification or machine-readable schema available","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/10 has no documented request or response format — its actual functionality is unknown","The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned","Cannot verify whether the advertised AI, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/10","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/transactions/10","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no example payloads. The actual functionality of /api/v1/transactions/10 is undocumented — even the name 'Premium API Access' is generic and uninformative.","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":"2026-04-19T11:50:09.726Z","embedding":[-0.031097412,-0.033294678,0.03778076,0.0135269165,0.01838684,-0.024398804,-0.029510498,0.012252808,0.076049805,-0.05831909,0.023452759,-0.05279541,-0.024780273,-0.032928467,-0.009292603,0.009025574,-0.0026187897,0.0018262863,-0.030715942,0.03100586,0.030059814,-0.008506775,-0.028961182,0.011741638,-0.0074882507,-0.011474609,-0.0056877136,-0.005355835,-0.022338867,-0.042053223,0.046417236,-0.030334473,-0.0051956177,0.001742363,-0.010536194,-0.011817932,-0.00014781952,0.026779175,0.03326416,-0.0073432922,0.0022697449,-0.058380127,0.000667572,-0.021240234,-0.059753418,-0.0038471222,0.015296936,-0.02722168,0.014595032,0.0016613007,-0.0418396,-0.003200531,-0.013420105,0.011131287,0.005542755,0.010032654,-0.005001068,-0.01007843,0.01335144,0.006855011,-0.014427185,-0.056488037,-0.011581421,-0.010147095,0.001452446,0.050109863,-0.0051574707,0.03778076,0.0071258545,0.06616211,0.03753662,0.05090332,0.0340271,0.016571045,0.010948181,-0.0071983337,-0.010070801,0.052459717,-0.013427734,-0.03994751,-0.0031108856,-0.003692627,-0.05621338,0.0040626526,-0.015731812,-0.052368164,-0.01361084,0.022140503,-0.022888184,0.028320312,-0.07342529,0.00068998337,-0.013320923,-0.0064315796,0.004760742,-0.012741089,-0.0053596497,0.016937256,-0.011077881,0.011367798,-0.009819031,-0.04650879,0.019073486,0.015571594,0.03894043,0.042755127,0.022216797,0.013999939,0.014099121,-0.001156807,-0.02734375,0.012374878,-0.0085372925,-0.015464783,0.004486084,0.009651184,-0.019836426,0.01537323,-0.028213501,0.015357971,-0.052764893,0.055389404,0.012451172,0.013336182,-0.0012378693,-0.051330566,-0.017471313,0.01159668,-0.028579712,-0.005619049,0.012832642,0.015960693,0.0209198,-0.019927979,-0.02758789,0.019973755,-0.026107788,-0.00009095669,-0.054016113,-0.03274536,0.042297363,-0.0309906,0.011993408,0.04800415,-0.10101318,-0.01626587,-0.044403076,0.00032258034,-0.030563354,-0.01576233,0.00969696,0.017181396,-0.020645142,-0.024658203,-0.0259552,-0.030960083,-0.0022354126,0.043395996,-0.0057868958,0.03881836,-0.031036377,0.028289795,0.010368347,0.008613586,0.0072402954,0.024963379,-0.008514404,-0.08251953,-0.08068848,-0.027511597,0.003856659,-0.030227661,-0.024902344,0.006790161,-0.012496948,-0.07537842,-0.019622803,-0.016433716,0.00028824806,-0.041778564,-0.008018494,-0.03125,0.015975952,-0.007965088,-0.049987793,-0.026550293,-0.033477783,0.057861328,0.027420044,0.035614014,0.022064209,0.0045394897,0.057128906,0.031677246,-0.013366699,-0.005973816,0.00969696,-0.023971558,0.023330688,-0.012145996,0.024810791,-0.028289795,0.037017822,0.076660156,0.0006284714,-0.032104492,-0.009506226,-0.060394287,-0.047851562,-0.03186035,0.024734497,0.010803223,-0.0101623535,0.04156494,-0.03515625,-0.029327393,-0.0011091232,0.015548706,0.014831543,0.06781006,0.015975952,-0.011184692,0.038604736,0.012214661,-0.056488037,0.044647217,0.04046631,0.0057754517,-0.024307251,-0.041290283,0.03338623,0.04647827,-0.03277588,0.02368164,-0.013618469,0.014717102,-0.015457153,0.00087690353,0.018493652,-0.014053345,-0.025146484,-0.014595032,-0.018661499,0.03274536,0.011581421,-0.025863647,-0.02935791,-0.082336426,0.0501709,0.039123535,0.04058838,-0.0033168793,0.0036792755,-0.022079468,-0.012542725,-0.07183838,0.05822754,0.07165527,-0.000060141087,-0.008804321,0.027557373,-0.005569458,-0.04196167,0.006023407,-0.019454956,-0.0234375,-0.020523071,0.017242432,-0.044830322,-0.0076026917,0.03289795,0.016311646,0.045928955,-0.013961792,-0.050964355,-0.019439697,-0.006164551,0.0007686615,-0.04058838,0.00072050095,-0.0013494492,0.012123108,0.025878906,0.012649536,0.013008118,0.004497528,0.0076942444,-0.0072784424,0.008094788,-0.013847351,-0.024932861,0.016555786,0.0016155243,-0.054626465,0.010940552,-0.0031108856,0.07751465,-0.0440979,0.036376953,-0.020217896,0.02293396,0.046661377,-0.009140015,-0.049835205,0.0043640137,0.03451538,0.0151901245,0.04650879,0.017593384,-0.027633667,-0.012466431,0.07775879,-0.0022506714,-0.0026817322,0.012382507,0.013847351,0.04296875,-0.016616821,-0.05142212,-0.044525146,-0.0038375854,-0.03970337,0.02911377,-0.019866943,0.023117065,-0.015350342,-0.001127243,-0.0231781,-0.00074005127,-0.033233643,0.009864807,-0.005607605,0.01033783,-0.013320923,-0.025848389,0.015205383,0.010551453,-0.010986328,0.0028686523,0.04324341,0.009475708,-0.011932373,-0.03277588,-0.03591919,-0.0026130676,-0.011550903,0.012390137,0.025619507,0.017852783,0.051940918,-0.033569336,-0.0066719055,0.013343811,0.018661499,0.028671265,-0.0034637451,-0.01020813,-0.061767578,-0.048950195,-0.02645874,-0.04547119,0.026535034,0.028457642,-0.008087158,0.05923462,0.012878418,-0.015609741,-0.029510498,0.018310547,-0.050048828,-0.0035572052,0.03994751,-0.013999939,-0.030639648,0.013511658,-0.005180359,0.0038528442,0.038604736,0.016571045,0.030029297,0.068115234,0.042419434,0.012336731,0.024398804,-0.0030288696,0.03729248,0.010696411,-0.02041626,-0.03414917,-0.02003479,0.02722168,-0.030853271,-0.015014648,-0.058288574,0.056549072,0.03503418,0.09362793,0.021133423,0.006916046,0.028457642,-0.014160156,0.011222839,-0.022705078,-0.025802612,-0.023269653,-0.036254883,0.03274536,-0.012451172,-0.012046814,-0.010658264,0.038360596,0.0026836395,0.016693115,-0.025177002,0.037628174,-0.022949219,-0.010299683,0.014053345,0.016723633,0.0491333,0.062286377,-0.04699707,0.030410767,0.028137207,-0.03543091,-0.00025987625,0.037200928,-0.012702942,-0.009101868,-0.045166016,-0.024719238,-0.007575989,-0.0077934265,-0.046295166,0.010345459,0.0042419434,0.024398804,0.02684021,-0.0057144165,-0.011177063,-0.0031795502,-0.015716553,-0.048034668,-0.00592041,-0.03866577,-0.0047912598,0.03955078,-0.024887085,-0.0039482117,-0.005207062,-0.00187397,-0.00043845177,0.008506775,0.026443481,-0.010223389,-0.05078125,0.03665161,0.0018491745,0.017318726,0.012550354,0.034851074,0.029006958,0.026046753,0.048034668,0.015213013,-0.014968872,-0.066711426,0.012870789,-0.037994385,0.0068359375,0.027114868,-0.032287598,-0.008026123,-0.009239197,-0.034210205,-0.028320312,0.012680054,-0.021957397,0.005519867,0.015853882,-0.021240234,-0.027557373,-0.0657959,-0.01940918,-0.0025177002,0.061279297,0.015213013,0.013389587,-0.056915283,-0.004600525,0.016815186,0.0019874573,0.04550171,-0.014915466,-0.0015850067,-0.011123657,-0.0435791,-0.008583069,-0.0259552,0.02293396,-0.005783081,0.0028057098,0.009963989,0.009262085,0.020202637,0.006088257,-0.00056791306,0.021347046,-0.01878357,-0.0041885376,-0.007270813,0.031402588,0.022399902,-0.00843811,-0.044769287,0.04135132,0.014320374,0.033111572,-0.042663574,-0.006752014,-0.008850098,-0.0018968582,0.0209198,-0.013595581,-0.0037059784,-0.015045166,-0.042938232,-0.07318115,0.04208374,-0.02079773,0.025497437,0.025390625,0.008934021,0.027999878,-0.01663208,-0.001206398,0.013908386,-0.026321411,-0.0059661865,-0.022994995,-0.030822754,-0.016204834,-0.018600464,-0.027526855,0.024841309,-0.02003479,0.009559631,0.004852295,-0.023849487,0.025634766,0.0053710938,-0.0068893433,0.017150879,0.0023956299,0.025390625,0.03781128,0.0030059814,-0.05026245,0.02142334,-0.00233078,0.0061187744,-0.0116119385,0.051483154,0.027114868,-0.008224487,-0.009376526,-0.011039734,-0.02456665,-0.024597168,0.010314941,0.0041389465,-0.0030155182,-0.0011978149,-0.03289795,0.009613037,-0.0044021606,-0.02861023,-0.033294678,0.009002686,0.012184143,-0.039520264,0.020019531,0.033050537,0.046936035,-0.021530151,0.011138916,0.00042939186,0.041412354,0.044281006,0.007926941,-0.008636475,0.01777649,-0.011054993,0.010574341,-0.004989624,-0.016586304,0.019119263,0.0021839142,0.021011353,0.0206604,0.011650085,-0.029403687,-0.03302002,0.0054969788,-0.013595581,-0.032440186,0.030136108,0.019546509,0.028137207,-0.027374268,0.020141602,0.016159058,-0.014503479,-0.014663696,-0.0126571655,0.04006958,-0.018157959,-0.007751465,0.01876831,0.00983429,0.02305603,-0.06048584,-0.005836487,0.0050849915,0.011985779,-0.019699097,-0.04550171,-0.039520264,-0.00016510487,0.040863037,0.014808655,0.03048706,0.03488159,0.0032577515,0.012290955,0.026245117,-0.0112838745,-0.016479492,-0.014228821,-0.052642822,-0.022918701,-0.014595032,0.0059890747,-0.036010742,0.016662598,-0.0021476746,-0.026977539,0.0016288757,-0.01512146,-0.0061836243,-0.016189575,0.01424408,0.034698486,0.011795044,0.021469116,-0.020507812,-0.036254883,-0.005558014,0.008155823,0.012992859,-0.04345703,0.020385742,-0.010299683,-0.0060310364,-0.0004479885,0.014389038,0.026260376,0.029449463,0.017608643,0.037750244,-0.045562744,0.05532837,-0.030090332,0.01663208,-0.0014657974,-0.038848877,-0.013961792,-0.021591187,-0.009986877,0.04196167,-0.03152466,-0.0041770935,-0.0357666,-0.038635254,-0.007534027,-0.05734253,0.018295288,0.040405273,0.04385376,-0.026489258,0.0035114288,-0.0017023087,0.013656616,-0.015167236,0.0031337738,-0.018569946,0.02947998,0.025436401,-0.0008735657,-0.023727417,-0.026992798,-0.020217896,-0.007835388,-0.04827881,-0.057434082,-0.0068244934,-0.0015592575,-0.0113220215,-0.018249512,-0.02432251,-0.040985107,-0.0022506714,-0.03717041,0.013298035,0.0035934448,0.021942139,0.0054244995,-0.03186035,-0.0034770966,0.007801056,-0.013847351,0.033477783,0.00945282,-0.004497528,-0.043762207,0.015205383,0.009002686,0.021026611,-0.016540527,-0.025772095,-0.011566162,-0.021957397,-0.05596924,-0.006713867,-0.0066108704,-0.017120361,-0.01586914,0.0025157928,-0.05404663,-0.0027484894,-0.020874023,-0.00459671,0.025100708,0.008842468,0.014778137,-0.007068634,0.017471313,-0.0011491776,-0.00094270706,-0.033477783,0.015083313,0.010887146,0.011817932,0.03048706,0.04736328,-0.0069618225,-0.031433105,0.008285522,0.00969696,0.014808655,-0.012954712,0.012260437,-0.026321411,0.013313293,-0.008087158,-0.008041382,-0.04425049,-0.0058517456,0.08050537,-0.0019664764,-0.0184021,-0.0124053955,-0.014625549,0.017837524,0.0362854,-0.030166626,0.0021762848,-0.029266357,0.017822266,-0.027511597,0.010322571,-0.0016613007,0.027420044,-0.010047913,-0.0496521,-0.01612854,-0.012016296,-0.013259888,-0.0680542,-0.034240723,-0.075805664,0.011672974,-0.008132935,-0.028900146,-0.00039744377,0.012634277,-0.018981934,-0.07989502,0.001209259,0.05291748,0.0023899078,0.03363037,-0.0057678223,0.02760315,0.034606934,-0.029144287,-0.0012435913,0.024993896,-0.03286743,-0.018875122,-0.020355225,0.016448975,-0.012313843,-0.008323669,-0.0009460449,0.0134887695,0.012916565,-0.004962921,0.011756897,-0.008636475,0.022216797,-0.010955811,0.01701355,-0.01966858,-0.013320923,0.038513184,-0.042053223,0.02558899,0.007575989,-0.012504578,0.007232666,0.038330078,0.04232788,-0.034698486,-0.011886597,0.015975952,0.013427734,0.029800415,-0.01828003,0.049987793,0.010070801,-0.014717102,0.008033752,-0.016311646,-0.012077332,-0.019760132,-0.027114868,0.021591187,0.00061511993,0.00957489,-0.017822266,-0.002128601,0.018127441,0.0034484863,0.011962891,-0.0072898865,-0.01625061,-0.02696228,0.010902405,0.002117157,0.005996704,0.0043563843,0.029067993,0.025024414,0.032836914,0.008125305,-0.01424408,0.0039482117,0.030166626,-0.008781433,-0.0014295578,0.025054932,0.004558563,0.015945435,0.017959595,0.012168884,-0.053497314,-0.019500732,-0.023727417,-0.02458191,-0.0069770813,-0.011764526,-0.013031006,-0.0028896332,0.002878189,-0.015777588,-0.031097412,-0.0018587112,-0.025848389,-0.022476196,0.0022335052,-0.0134887695,0.020629883,0.014915466,0.005771637,0.0014715195,-0.012756348,0.039093018,-0.0079956055,-0.014099121,0.033325195,0.02670288,0.020721436,-0.033813477,-0.0099105835,-0.018203735,-0.014724731,0.003435135,-0.03543091,0.013198853,0.040985107,-0.018005371,-0.00044631958,0.0037212372,0.027709961,-0.008659363,0.0043144226,-0.011528015,0.015403748,-0.006954193,0.035827637,-0.05050659,0.022384644,0.0056152344,0.0063095093,-0.017578125,-0.013504028,-0.025177002,0.023605347,-0.0011205673,-0.009811401,0.048828125,0.014266968,0.034454346,-0.023956299,-0.027557373,0.0060157776,-0.028778076,-0.02696228,0.019485474,-0.0067825317,0.0033226013,0.016159058,-0.024795532,0.027999878,-0.033935547,0.018997192,0.0074501038,0.0064582825,-0.0012769699,-0.01878357,0.0017633438,-0.008270264,-0.018814087,0.00045609474,-0.008850098,0.045928955,0.02027893,0.027801514,0.049743652,0.022949219,0.0073509216,-0.042266846,-0.032348633,0.0037288666,-0.013313293,0.018173218,-0.011741638,0.047943115,0.03878784,0.00819397,0.04260254,0.03390503,0.04083252,0.0033550262,0.007423401,-0.018692017,0.011695862,-0.0060043335,0.03302002,-0.001373291,0.03857422,-0.037506104,0.025375366,0.020141602,0.02178955,-0.01637268,0.03741455,0.06964111,0.01940918,-0.004989624,0.035614014,-0.007648468,-0.007106781,-0.008911133,-0.020339966,0.04949951,-0.0010509491,0.04940796,0.04940796,0.006816864,0.0017194748,0.019515991,-0.031066895,-0.020202637,0.06341553,0.035308838,-0.024017334,-0.012420654,-0.0048332214,0.0047416687,-0.041137695,-0.025848389,0.024597168,-0.008491516,0.0062713623,-0.0032920837,-0.008972168,-0.017303467,0.00025510788,0.015357971,0.008079529,-0.01158905,0.022491455,0.028167725,-0.00087451935,0.025299072,-0.0053482056,0.026733398,-0.023345947,-0.024719238,0.023925781,0.021316528,-0.008552551,-0.0020999908,0.023239136,0.0060195923,0.03314209,0.044677734,-0.029327393,0.005493164,0.026062012,0.014541626,-0.0001411438,0.05114746,0.039520264,0.010437012,0.03894043,0.02897644,0.040130615,-0.0413208,0.026626587,0.0014390945,0.00070858,-0.013320923,-0.008605957,0.0047912598,-0.01121521,0.024307251,-0.004753113,-0.016662598,0.017532349,0.01676941,-0.010383606,-0.0077590942,-0.005504608,0.018066406,-0.031829834,-0.0061073303,0.013908386,-0.00944519,0.03564453,0.014251709,0.023956299,-0.023239136,0.01576233,-0.002286911,-0.01876831,-0.0012931824,0.027023315,-0.03793335,-0.0002462864,-0.0068511963,0.001490593,-0.057556152,0.0033664703,0.024246216,-0.011436462,0.022109985,0.010986328,-0.008605957,-0.012001038,0.033966064,0.009979248,-0.0035800934,-0.013763428,-0.028320312,0.025466919,0.037719727,-0.008369446,-0.0023498535,-0.024475098,-0.0071792603,0.0046806335,-0.0115356445,-0.003490448,-0.006717682,-0.020706177,-0.0118255615,0.026870728,0.034362793,0.027008057,0.051452637,-0.024093628,-0.019805908,0.010070801,0.036621094,0.003271103,-0.0003437996,0.007259369,0.015640259,-0.023956299,0.04586792,0.03967285,0.01020813,0.030059814,0.0022964478,-0.013832092,0.011230469,-0.017364502,0.028900146,-0.010559082,0.0013523102,-0.0039520264,0.0259552,-0.01586914,-0.03543091,0.007873535,-0.018692017,-0.029327393,-0.012580872,0.018112183,-0.0033187866,0.029251099,0.042236328,0.021911621,-0.025039673,0.060455322,-0.00982666,0.037078857,0.0077056885,-0.018218994,0.050964355,0.0151901245,0.03842163,0.016036987,0.01084137,-0.041137695,0.02168274,0.031219482,0.020141602,0.004798889,0.00667572,-0.014343262,0.036193848,-0.005859375,0.038482666,-0.012023926,0.008033752,0.01838684,-0.005393982,-0.005054474,-0.0154953,-0.00030708313,0.0049819946,0.050964355,-0.02267456,-0.0071144104,-0.030349731,-0.0058021545,0.02545166,-0.0141067505,0.002117157,-0.0047798157,-0.02255249,0.0134887695,-0.020431519,-0.024993896,0.014724731,0.024993896,-0.057006836,-0.0121536255,0.00856781,0.029144287,-0.021942139,0.026885986,0.017288208,-0.00033164024,0.006439209,0.041412354,-0.010437012,0.03250122,-0.01260376,0.026504517,0.030517578,0.005508423,-0.021957397,-0.0047950745,0.0044517517,-0.0062332153,0.0127334595,0.032287598,-0.026504517,0.0065956116,-0.013450623,-0.0021076202,-0.0030784607,0.009025574,-0.010406494,0.009109497,-0.0062026978,-0.005908966,0.0019683838,0.0070343018,-0.0017127991,0.007873535,0.0067100525,-0.023651123,0.01197052,0.034484863,0.02178955,-0.0340271,-0.005809784,0.0078048706,0.0038166046,-0.01965332,-0.008659363,-0.008522034,-0.036254883,0.010360718,0.01651001,0.01146698,0.013954163,-0.025543213,0.0013256073,0.018203735,0.004714966,0.014579773,0.0047035217,-0.0015449524,0.01486969,-0.0031166077,-0.0059013367,-0.0061950684,-0.009544373,0.011619568,0.020370483,0.004463196,-0.028747559,0.02192688,-0.0070495605,0.012756348,0.0035762787,-0.0072784424,0.017105103,-0.008773804,0.0004696846,0.0008382797,0.014823914,-0.008140564,-0.00920105,-0.010612488,0.04046631,0.054107666,-0.014770508,-0.012786865,0.020889282,0.019561768,0.016159058,0.037078857,0.005142212,0.038909912,0.02885437,-0.014251709,-0.021972656,0.026367188,-0.009101868,-0.025909424,0.015686035,-0.0129776,-0.008514404,0.02305603,0.013000488,0.0039520264,-0.033203125,-0.01146698,-0.014198303,-0.013504028,0.01146698,-0.006778717,0.019073486,-0.025802612,-0.013542175,0.018005371,-0.029327393,-0.04940796,-0.019378662,-0.0057907104,-0.0121536255,-0.048797607,0.003791809,-0.024276733,0.012207031,-0.03262329,0.0059928894,-0.012535095,0.012809753,-0.014282227,-0.013015747,0.0027675629,0.022537231,0.02848816,0.0018787384,0.021438599,-0.024765015,-0.008277893,-0.030136108,0.013885498,-0.016357422,0.021224976,0.0048828125,0.030807495,0.02230835,-0.01763916,-0.00056409836,-0.010169983,-0.0051727295,-0.018585205,-0.012878418,-0.0256958,0.027404785,0.014808655,-0.008995056,-0.011390686,0.037017822,-0.030303955,-0.013595581,0.02935791,0.0390625,0.0030670166,0.031463623,-0.019195557,0.004924774,-0.015777588,-0.005180359,-0.0146865845,0.0051498413,0.0062713623,0.014434814,-0.0046195984,0.0063056946,0.020233154,-0.013702393,0.0008621216,0.034240723,0.015609741,-0.009101868,0.03665161,0.01473999,0.007167816,-0.01335144,-0.0046310425,0.025497437,0.04849243,0.0071144104,0.008491516,-0.009361267,0.006061554,-0.013999939,0.012397766,0.01725769,-0.022064209,-0.048034668,-0.013458252,-0.037139893,0.028213501,-0.003074646,0.0034980774,-0.013076782,0.024230957,-0.009162903,-0.029296875,-0.021453857,0.03552246,0.017150879,-0.021606445,-0.0057868958,0.019042969,0.016067505,-0.03717041,-0.0028762817,-0.046844482,-0.028869629,-0.01550293,-0.018081665,0.02758789,0.008804321,-0.0023059845,-0.0007967949,-0.0007214546,0.00039458275,0.002117157,0.020980835,-0.013793945,0.0023708344,0.026062012,0.022460938,-0.02015686,0.025024414,-0.012397766,0.0065307617,0.010215759,-0.008285522,0.012687683,-0.027130127,0.029907227,-0.013015747,-0.0077667236,0.025054932,-0.0006122589,0.014434814,-0.032470703,0.0063285828,0.0025901794,-0.010482788,0.042907715,-0.025222778,-0.01133728,0.0068092346,-0.0135650635,-0.022399902,0.009208679,0.017715454,0.031173706,-0.004600525,0.051940918,-0.008201599,-0.0014686584,0.012519836,0.015167236,-0.016235352,0.004295349,0.027404785,0.005367279,0.0061073303,-0.0038166046,-0.009422302,-0.031433105,-0.0069618225,0.013923645,-0.0067634583,-0.0129852295,0.03439331,0.02027893,0.050750732,-0.0009608269,0.027267456,0.01020813,0.008277893,0.028778076,-0.0032958984,0.05368042,-0.0025596619,-0.026779175,0.0040893555,0.002008438,-0.020523071,0.0064849854,0.0008416176,0.0010232925,-0.039520264,0.008018494,0.0012578964,0.018966675,-0.015556335,0.013908386,-0.023284912,-0.01789856,-0.03543091,-0.004508972,-0.039611816,0.008087158,0.031219482,0.0070533752,0.03677368,-0.0016651154,-0.02810669,0.02003479,0.046295166,0.0069007874,-0.021026611,-0.016296387,0.007095337,-0.0005722046,0.0050086975,0.010009766,-0.020095825,-0.013580322,0.006011963,-0.014198303,0.016967773,-0.008270264,0.0146102905,0.0060920715,-0.0017385483,-0.012908936,0.022583008,-0.005519867,-0.0064926147,0.017501831,0.005279541,0.031677246,0.032714844,-0.01651001,0.024368286,0.014251709,-0.045166016,0.060058594,-0.0015325546,0.028427124,-0.019302368,0.012451172,-0.033935547,-0.026229858,-0.018203735,0.004623413],"createdAt":"2026-04-18T18:58:12.520Z","updatedAt":"2026-04-22T15:02:09.967Z","lastSeenAt":"2026-04-22T15:02:09.967Z","tsv":"'/api':182 '/api/v1/transactions/10':84,223 '/docs':180 '/pricing':181 '/readme':184 '/request':13,28 '0.02':12,27,59,106 '000':100 '20':99 '402':94 '402 payment API' 'Base network API' 'USDC micropayment API' 'access':90 'actual':213 'advertis':111 'ai':123 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'alon':235 'analysi':127 'analyt':48,117 'api':5,20,37,71,89,115 'avail':211 'base':8,23,67,101 'behavior':214 'broad':42 'call':4,19,108 'caller':155 'cannot':228 'categori':113 'challeng':95 'classif':130 'collect':43 'connect':190 'contain':162 'convers':146 'conversion' 'cost':58 'crawl':233 'crypto-gas-estimates' 'crypto-paid API' 'data':47,52,116,120 'data-analytics' 'detail':197 'document':175,206 'embed':131 'enabl':36 'endpoint':45,57,82,149,220,224 'estim':141 'everi':56 'exampl':209 'exchang':136 'exchange-rates' 'export':121 'extrem':177 'feed':135 'financ':132 'finance-price-feeds' 'finance/web3':51 'follow':150 'format':217 'four':112 'fulfil':170 'gas':140 'generat':147 'geocod':144 'geocoding' 'header':161 'i.e':105 'includ':221 'infer':50 'infrastructur':54,143 'insight':122 'key':72 'learn':125 'limit':75 'list':86,226 'low payment fee API' 'lowpaymentfee.com':31 'machin':124 'materi':234 'metric':118 'network':9,24,68 'offer':40 'openapi':201 'output':216 'page':185 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':210 'payment':153,160,165 'per':3,18,60,107 'platform':6,21,38,110 'premium':88 'price':134 'prompt':192 'proof':166 'protocol':154 'quot':139 'rate':74,137 'render':187 'report':119 'request':61,96,172 'request/response':204 'requir':79 'return':92 'schema':205 'send':156 'sentiment':126 'server':169 'sign':164 'span':46 'spars':178 'spec':202 'specif':81 'subscript':78 'summar':129 'technic':196 'text':128 'token':138 'unit':102 'upon':173 'usdc':15,30,64,104 'usdc-base-network' 'util':55 'valid':145 'validation' 'verif':174 'verifi':230 'via':10,25 'wallet':191 'web3':133 'x':159 'x-payment':158 'x402':11,26,35,152 'x402 API platform' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c8f56e16-52f3-4b78-b393-67a3f4932d8f","listingId":"1db7e180-a4d1-478f-9806-c0ce3e75a026","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/transactions/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:12.520Z"}],"sources":[{"listingId":"1db7e180-a4d1-478f-9806-c0ce3e75a026","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:12.520Z","lastSeenAt":"2026-04-22T15:02:09.967Z"}],"details":{"listingId":"1db7e180-a4d1-478f-9806-c0ce3e75a026","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/10 \\\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":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/transactions/10 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/10"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto price feeds with per-request USDC payments","Running geocoding, validation, or data conversion tasks on a pay-as-you-go basis","Integrating agent-purchasable API calls into autonomous workflows via x402"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing lightweight access to multiple utility endpoints without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or rate-limit guarantees","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.66Z"},"updatedAt":"2026-04-22T15:02:09.967Z"}}