{"id":"c77fc7c3-587a-4c85-89eb-5143d836420b","shortId":"TDwjzS","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/charges/200` is listed as \"Premium API Access\" and charges 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 & ML (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All are priced uniformly at $0.02 per request. Payment is handled via the x402 protocol's exact scheme, settling in USDC on Base to a specified payee address.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual behavior and response format of the `/api/v1/charges/200` endpoint (and all others) is unknown beyond what the x402 challenge reveals.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request/response formats for any endpoint","The specific purpose of /api/v1/charges/200 ('Premium API Access') is unclear — it may be a generic or demo endpoint","Cannot verify what data or service any endpoint actually returns without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/200","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/charges/200","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/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality of this specific endpoint is undocumented.","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":"2026-04-19T03:33:00.989Z","embedding":[-0.028900146,-0.039367676,0.034729004,0.009521484,0.02557373,-0.024749756,-0.031707764,0.01637268,0.06185913,-0.05935669,0.02520752,-0.053009033,-0.02456665,-0.039154053,-0.015823364,0.013755798,-0.011749268,0.014656067,-0.04034424,0.042236328,0.02305603,-0.016403198,-0.023605347,0.022842407,-0.008468628,-0.022598267,-0.0064201355,-0.0033893585,-0.025131226,-0.03881836,0.040802002,-0.02609253,-0.0060653687,0.0048599243,0.0010309219,-0.013496399,-0.0077667236,0.019119263,0.02973938,-0.0003926754,-0.011451721,-0.052825928,0.006793976,-0.009971619,-0.055664062,-0.009155273,0.015037537,-0.010879517,0.009223938,0.010643005,-0.040496826,-0.0029087067,-0.00932312,0.007095337,0.0040397644,0.020568848,-0.007850647,-0.0024375916,0.015464783,0.012001038,0.007335663,-0.058013916,-0.009277344,-0.0020618439,-0.005279541,0.05407715,-0.0070610046,0.038726807,0.0038795471,0.05404663,0.03543091,0.044799805,0.035003662,0.0014801025,0.011421204,-0.017044067,-0.010253906,0.052947998,-0.0211792,-0.007865906,-0.008651733,0.002439499,-0.057006836,-0.0063476562,-0.012184143,-0.055664062,-0.01739502,0.018218994,-0.040008545,0.031173706,-0.0736084,-0.006008148,-0.019485474,-0.005847931,0.012741089,0.0071525574,0.0039711,0.02003479,-0.0040740967,0.010635376,-0.001124382,-0.049682617,0.012031555,0.018463135,0.03604126,0.037475586,0.018249512,0.021743774,0.0005426407,-0.010726929,-0.04071045,0.01802063,-0.023880005,-0.023132324,0.002746582,0.013549805,-0.012832642,0.023330688,-0.03591919,0.00283432,-0.046325684,0.053771973,0.02243042,0.016540527,0.016845703,-0.045837402,-0.027648926,0.015327454,-0.031677246,-0.01828003,0.016036987,0.0035705566,0.024475098,-0.027938843,-0.021469116,0.0011806488,-0.020355225,-0.017410278,-0.048095703,-0.03515625,0.046081543,-0.030303955,0.01576233,0.030548096,-0.097839355,-0.006702423,-0.044067383,0.003534317,-0.030548096,-0.018508911,0.0054512024,0.026306152,-0.023971558,-0.018341064,-0.0074653625,-0.015365601,-0.015014648,0.037872314,-0.007270813,0.03656006,-0.018478394,0.032165527,0.004890442,-0.000849247,-0.0017852783,0.013221741,-0.0058021545,-0.08911133,-0.08569336,-0.030227661,-0.015113831,-0.034057617,-0.025650024,-0.011352539,-0.010574341,-0.07269287,-0.015060425,-0.02204895,-0.007865906,-0.03781128,-0.007575989,-0.021987915,0.0072517395,-0.013694763,-0.05532837,-0.015075684,-0.013534546,0.06762695,0.024414062,0.032989502,0.016830444,-0.004722595,0.061706543,0.043792725,-0.016998291,-0.0073280334,0.0141067505,-0.013626099,0.026565552,-0.0053215027,0.018112183,-0.031173706,0.049804688,0.057373047,0.014175415,-0.023284912,-0.0034065247,-0.05001831,-0.050231934,-0.04336548,0.020736694,0.0027942657,-0.008666992,0.043884277,-0.040222168,-0.035583496,-0.00983429,0.013389587,0.0045318604,0.06585693,0.024307251,0.0013122559,0.02003479,0.009757996,-0.05279541,0.04534912,0.01574707,0.00066661835,-0.0019435883,-0.030670166,0.03161621,0.0262146,-0.037902832,0.017669678,-0.022521973,0.01235199,0.0035572052,0.009109497,0.01486969,-0.016723633,-0.02293396,-0.010864258,-0.027023315,0.02973938,0.013076782,-0.02835083,-0.028656006,-0.07965088,0.05496216,0.019226074,0.03552246,-0.004699707,0.010437012,-0.012573242,-0.0062713623,-0.081604004,0.047698975,0.07470703,0.008285522,-0.028579712,0.013198853,-0.0019140244,-0.0362854,0.007850647,-0.0024929047,-0.029937744,-0.025909424,0.032409668,-0.05731201,-0.0062294006,0.029556274,0.01852417,0.061309814,-0.021942139,-0.051483154,-0.015144348,-0.0009651184,-0.0026798248,-0.027389526,0.0020046234,-0.011199951,0.024658203,0.026428223,-0.0055770874,0.015586853,-0.0020122528,0.0072898865,-0.0025634766,-0.001698494,-0.018493652,-0.019119263,0.016799927,-0.007896423,-0.05795288,0.016235352,-0.0015554428,0.07458496,-0.04675293,0.040649414,-0.007041931,0.018920898,0.045806885,-0.00667572,-0.05026245,0.013305664,0.029388428,0.008895874,0.04156494,0.021209717,-0.019821167,-0.009277344,0.07324219,-0.009437561,-0.00095272064,-0.0026512146,0.0000019669533,0.033203125,-0.013267517,-0.061187744,-0.052246094,-0.004512787,-0.034088135,0.03274536,-0.014328003,0.01486969,-0.017120361,0.009590149,-0.017120361,0.010597229,-0.033691406,0.018127441,-0.017410278,0.015930176,-0.011497498,-0.029373169,0.008491516,0.0044898987,-0.008331299,0.005039215,0.034729004,0.026306152,-0.016220093,-0.04043579,-0.035491943,-0.0051345825,-0.007713318,0.009117126,0.02217102,0.025543213,0.046020508,-0.033813477,0.0047569275,0.023605347,0.010696411,0.03010559,-0.00982666,-0.011459351,-0.071777344,-0.05316162,-0.026290894,-0.038604736,0.03387451,0.036499023,-0.0015716553,0.048339844,0.0028038025,-0.024032593,-0.026031494,0.022323608,-0.038726807,0.000620842,0.03970337,-0.013572693,-0.045837402,0.005756378,-0.0033416748,0.0021476746,0.038513184,0.0077667236,0.017211914,0.068115234,0.027359009,0.0032157898,0.017990112,0.019607544,0.034240723,0.007865906,-0.024002075,-0.026443481,0.000012457371,0.03466797,-0.030334473,-0.03149414,-0.06262207,0.062927246,0.027648926,0.08068848,0.013244629,0.013717651,0.032073975,-0.014266968,0.021896362,-0.022460938,-0.02305603,-0.029754639,-0.052337646,0.04437256,-0.018310547,-0.0029315948,-0.01802063,0.047973633,-0.0006375313,0.013442993,-0.025878906,0.031021118,-0.01461792,-0.0047340393,0.017913818,0.016525269,0.057891846,0.06756592,-0.05279541,0.012382507,0.023864746,-0.042236328,0.005130768,0.05303955,-0.018447876,-0.007575989,-0.06109619,-0.02722168,-0.0017051697,-0.009025574,-0.061706543,0.006958008,0.0013208389,0.016571045,0.022705078,-0.00025963783,-0.010406494,-0.007865906,-0.022033691,-0.055145264,0.0008845329,-0.050445557,-0.0025024414,0.029922485,-0.027145386,0.0055656433,-0.017929077,-0.015838623,-0.0050849915,0.0050315857,0.039367676,-0.013832092,-0.05130005,0.049560547,0.008552551,0.0049095154,0.0037403107,0.04220581,0.036071777,0.015090942,0.04751587,0.013641357,-0.024978638,-0.064453125,0.02999878,-0.03768921,0.010665894,0.016693115,-0.02279663,-0.0063552856,-0.019699097,-0.0390625,-0.029342651,-0.0060272217,-0.017471313,-0.0076026917,0.012863159,-0.026397705,-0.038238525,-0.059570312,-0.009506226,-0.008598328,0.06958008,0.015838623,-0.0036582947,-0.059509277,-0.005832672,0.022232056,0.00095272064,0.042419434,-0.014251709,-0.017913818,-0.0015268326,-0.05255127,0.006713867,-0.027755737,0.015991211,-0.011199951,0.00020825863,0.024124146,0.0077667236,0.023269653,0.000030040741,0.010131836,0.037322998,-0.04067993,-0.013877869,-0.022262573,0.023635864,0.011199951,0.0029468536,-0.041931152,0.044525146,0.022277832,0.035858154,-0.037078857,0.004173279,-0.013824463,0.0004131794,0.023635864,-0.010269165,-0.0026397705,-0.013427734,-0.050445557,-0.05508423,0.023330688,-0.02458191,0.026351929,0.013824463,-0.00073480606,0.024673462,-0.025650024,0.015350342,0.014137268,-0.030410767,-0.003572464,-0.014160156,-0.032165527,-0.009132385,-0.003824234,-0.018829346,0.026412964,-0.014541626,0.012779236,-0.015258789,-0.019561768,0.03479004,0.012886047,-0.0104904175,0.029663086,-0.008911133,0.020935059,0.052612305,0.016174316,-0.042419434,0.02999878,0.000813961,0.009109497,-0.01966858,0.045043945,0.03552246,0.001581192,-0.012786865,-0.0124435425,-0.018936157,-0.012748718,0.0067596436,0.01852417,0.017333984,-0.0067100525,-0.048706055,0.01651001,0.0012607574,-0.016494751,-0.018218994,0.012588501,0.016525269,-0.03930664,0.022033691,0.016784668,0.059509277,-0.023925781,0.010513306,0.0034980774,0.035705566,0.03616333,0.009803772,-0.003419876,0.009437561,-0.011154175,0.0014038086,-0.02355957,-0.00573349,0.02897644,-0.0033836365,0.020126343,0.023406982,0.00737381,-0.020492554,-0.024734497,0.017593384,-0.02130127,-0.02809143,0.02029419,0.018600464,0.008018494,-0.036987305,0.021911621,0.014343262,-0.019760132,-0.018371582,0.010284424,0.034973145,-0.019699097,-0.009277344,0.019104004,0.00027942657,0.02357483,-0.058258057,-0.016174316,0.00844574,0.015335083,-0.027328491,-0.040985107,-0.03756714,0.010559082,0.03604126,0.004802704,0.022567749,0.037017822,0.012893677,0.00868988,0.02407837,-0.005104065,-0.024398804,-0.0032310486,-0.04977417,-0.018249512,-0.012069702,0.00289917,-0.033081055,0.016601562,-0.017593384,-0.04446411,0.007850647,-0.012390137,-0.0029144287,-0.0010700226,0.015388489,0.038848877,0.0031490326,0.017303467,-0.017974854,-0.03225708,-0.010002136,-0.006450653,0.019210815,-0.05218506,0.0039901733,-0.005756378,-0.0034484863,0.0063972473,0.0056419373,0.023895264,0.024215698,0.014099121,0.03616333,-0.041931152,0.057525635,-0.0368042,0.023422241,0.011230469,-0.03805542,-0.014839172,-0.031280518,-0.008979797,0.04660034,-0.035064697,-0.011116028,-0.027297974,-0.036193848,-0.0031204224,-0.055541992,0.014595032,0.03805542,0.043395996,-0.01965332,-0.0029354095,0.0060310364,-0.0014209747,-0.019973755,0.0073547363,-0.021331787,0.017944336,0.020736694,0.0025615692,-0.0184021,-0.02684021,-0.022109985,0.0087890625,-0.048553467,-0.057739258,-0.007461548,-0.003162384,-0.008956909,-0.020904541,-0.024276733,-0.04260254,0.0028591156,-0.036468506,0.013977051,0.008666992,0.020309448,0.0018177032,-0.022476196,-0.00573349,0.00034284592,-0.021087646,0.032958984,-0.004055023,-0.010246277,-0.031951904,0.0046844482,0.022125244,0.012207031,-0.0082473755,-0.019592285,-0.010604858,-0.017166138,-0.053131104,0.004863739,-0.004501343,-0.011741638,-0.0021572113,0.0071258545,-0.045654297,-0.0059394836,-0.024307251,-0.0022773743,0.030181885,0.013145447,0.0014123917,-0.0074157715,0.00484848,0.0020618439,-0.01423645,-0.025756836,0.021392822,0.010864258,0.001953125,0.023468018,0.03933716,-0.00040245056,-0.02166748,-0.0030727386,0.015960693,0.02519226,-0.026809692,0.011650085,-0.024002075,0.015090942,-0.016479492,-0.011207581,-0.025268555,-0.0056114197,0.07684326,0.0061912537,-0.02243042,-0.003900528,-0.024459839,0.017578125,0.026428223,-0.03756714,0.0027809143,-0.03515625,0.014099121,-0.032440186,0.01133728,-0.0041007996,0.0184021,-0.027618408,-0.061035156,-0.006614685,0.0004348755,-0.014602661,-0.07324219,-0.024383545,-0.08087158,0.0058250427,-0.011062622,-0.025512695,0.0017518997,0.006767273,-0.021011353,-0.07434082,0.010559082,0.048034668,-0.0047569275,0.027511597,-0.0072517395,0.020523071,0.026748657,-0.027282715,0.009155273,0.0262146,-0.017547607,-0.012062073,-0.015258789,0.0141067505,-0.016311646,-0.008674622,0.0046424866,0.021469116,0.010284424,-0.00059223175,0.017410278,-0.008468628,0.025497437,-0.011756897,0.0054397583,-0.007610321,-0.008331299,0.045318604,-0.054229736,0.028030396,0.018554688,-0.007133484,0.006877899,0.025802612,0.050476074,-0.03390503,-0.016342163,0.020568848,0.009864807,0.030563354,-0.024841309,0.049102783,0.0184021,-0.014633179,0.0019626617,-0.011154175,-0.005847931,-0.021820068,-0.029373169,0.025741577,0.011230469,0.0061035156,-0.007881165,0.004432678,0.010475159,-0.0073280334,0.010643005,-0.0184021,-0.0057411194,-0.011650085,0.009971619,-0.0068473816,0.0052490234,0.0011720657,0.025482178,0.016708374,0.03012085,-0.0000025629997,-0.003458023,0.00019812584,0.036468506,-0.007972717,0.0022087097,0.027694702,0.016036987,0.031311035,0.019561768,0.0037822723,-0.036956787,-0.013442993,-0.0259552,-0.014694214,0.00092840195,-0.018661499,0.0013837814,-0.005783081,0.0079422,-0.021377563,-0.022567749,-0.0004196167,-0.028945923,-0.0143585205,-0.008018494,0.0008249283,0.025024414,0.007980347,0.0070533752,0.00096035004,-0.00047922134,0.047912598,-0.008293152,-0.00050115585,0.02558899,0.026992798,0.026489258,-0.03555298,-0.0072784424,-0.01600647,-0.010185242,0.0044555664,-0.030700684,0.015914917,0.053710938,-0.0178833,0.011405945,-0.0036945343,0.02432251,-0.0033607483,0.0010251999,-0.016662598,0.0206604,-0.008644104,0.028686523,-0.047698975,0.025299072,0.02168274,0.0015125275,-0.014541626,-0.014198303,-0.023712158,0.018295288,0.01071167,0.0025405884,0.052246094,0.005874634,0.015625,-0.021759033,-0.010253906,0.012138367,-0.022857666,-0.028244019,0.020965576,-0.008911133,0.0073928833,0.0045280457,-0.025726318,0.034729004,-0.03225708,0.011146545,0.0007686615,0.008079529,0.0007009506,-0.010032654,-0.016662598,-0.015586853,-0.01108551,0.0053710938,0.00071811676,0.045684814,0.010604858,0.04006958,0.05343628,0.020202637,-0.001698494,-0.051483154,-0.02178955,-0.0077209473,-0.022033691,0.01360321,-0.0026245117,0.04171753,0.035461426,0.008972168,0.036346436,0.040374756,0.038635254,0.00018441677,0.012550354,-0.018295288,0.008766174,-0.011222839,0.024642944,-0.0044517517,0.03375244,-0.03189087,0.021026611,0.016098022,0.026321411,-0.02357483,0.0256958,0.06402588,0.015258789,-0.01448822,0.039764404,-0.0055618286,-0.017456055,-0.008018494,-0.017974854,0.059783936,0.00982666,0.051513672,0.056610107,0.010848999,-0.010437012,0.012382507,-0.03604126,-0.021636963,0.07501221,0.025970459,-0.0231781,-0.015914917,0.0032310486,0.0063972473,-0.046203613,-0.025375366,0.023391724,-0.0055389404,0.001244545,-0.01864624,-0.012054443,-0.027832031,0.009841919,0.0127334595,0.0143585205,-0.021881104,0.013679504,0.029205322,0.0011749268,0.024841309,-0.005886078,0.02670288,-0.021469116,-0.030517578,0.014724731,0.016036987,-0.009422302,-0.00573349,0.021469116,0.00415802,0.034057617,0.038513184,-0.022567749,0.0034294128,0.02897644,0.022094727,-0.0019073486,0.05444336,0.03970337,0.010025024,0.043182373,0.033477783,0.040008545,-0.03994751,0.028121948,0.006832123,0.010643005,-0.0033836365,-0.010314941,0.0061302185,-0.013702393,0.01600647,-0.008010864,-0.0206604,0.021957397,0.028137207,-0.011154175,-0.006713867,-0.00037574768,0.012969971,-0.020568848,-0.0021381378,0.0027370453,-0.01473999,0.020645142,0.012611389,0.022659302,-0.01939392,0.02154541,-0.0029144287,-0.015060425,-0.004886627,0.018661499,-0.032989502,-0.00069236755,-0.0020122528,-0.008918762,-0.040283203,0.013153076,0.022003174,-0.0077934265,0.026809692,0.012878418,0.0035152435,0.0015802383,0.016967773,0.011245728,0.00242424,-0.0076942444,-0.012237549,0.02861023,0.043121338,-0.0008530617,0.0063476562,-0.034210205,-0.0017652512,0.0054092407,-0.0030345917,-0.007171631,-0.0037269592,-0.028244019,-0.008560181,0.01789856,0.028717041,0.027664185,0.040527344,-0.021484375,-0.023345947,0.0073890686,0.026931763,0.0012073517,0.0068130493,0.0064926147,0.018859863,-0.013809204,0.0357666,0.029968262,0.020248413,0.035461426,0.0006375313,-0.0064964294,0.017547607,-0.018249512,0.029296875,-0.025222778,0.01360321,-0.0052833557,0.025741577,-0.011367798,-0.029937744,0.011924744,-0.011665344,-0.031173706,-0.028396606,0.015388489,0.002866745,0.024993896,0.03881836,0.030288696,-0.034088135,0.059783936,-0.0072631836,0.04763794,0.0035381317,-0.012680054,0.051696777,0.028930664,0.029937744,0.016967773,0.0004813671,-0.039642334,0.010215759,0.04269409,0.027175903,0.0070495605,0.0029201508,-0.011375427,0.029205322,-0.009674072,0.029785156,-0.005695343,0.0066871643,0.009880066,-0.007434845,-0.007911682,-0.005748749,-0.0032672882,0.0020484924,0.05279541,-0.016860962,-0.015808105,-0.03466797,-0.0129852295,0.028060913,-0.0071868896,0.004047394,0.0010204315,-0.01651001,0.008216858,-0.030334473,-0.030929565,0.013015747,0.028869629,-0.0569458,-0.019760132,0.0037174225,0.02154541,-0.020568848,0.027770996,0.023773193,-0.010620117,0.0036449432,0.04156494,-0.015640259,0.021636963,-0.014503479,0.028533936,0.029815674,0.007282257,-0.02368164,-0.005622864,0.00043678284,-0.003873825,0.013282776,0.030334473,-0.015075684,0.004650116,-0.0073928833,-0.001581192,-0.0054740906,0.00071811676,-0.017242432,0.012466431,-0.0034809113,-0.007160187,0.0037231445,0.005558014,-0.0023918152,0.008842468,-0.0070762634,-0.008201599,0.0021476746,0.025131226,0.0284729,-0.04360962,0.0004491806,0.008666992,0.00022375584,-0.02520752,-0.013267517,-0.0070343018,-0.029846191,0.021606445,0.02748108,0.013641357,0.014015198,-0.02470398,0.0015935898,0.02798462,-0.0031318665,0.021026611,0.0042266846,-0.01309967,0.010063171,-0.015281677,-0.011405945,-0.0093307495,-0.01586914,0.0075531006,0.028305054,0.006439209,-0.023529053,0.033294678,-0.002828598,0.015945435,-0.0058937073,-0.011192322,0.018585205,-0.009552002,-0.0063056946,0.009506226,0.011909485,-0.011131287,-0.0151901245,-0.011810303,0.040618896,0.052246094,-0.004711151,-0.011428833,0.021133423,0.019744873,0.019577026,0.046905518,0.009017944,0.04638672,0.015548706,-0.019760132,-0.009346008,0.025283813,-0.011116028,-0.032806396,0.020584106,-0.0029945374,-0.00054359436,0.018081665,0.011138916,0.0018320084,-0.023544312,-0.014877319,-0.01361084,-0.009979248,0.0154953,0.0011997223,0.02835083,-0.021316528,-0.0055770874,0.0005540848,-0.031219482,-0.052612305,-0.02268982,-0.0018224716,-0.010498047,-0.05316162,0.00010061264,-0.034057617,0.011276245,-0.028579712,-0.006702423,-0.018310547,0.018920898,-0.018981934,-0.00026535988,0.0037631989,0.023254395,0.027282715,-0.00038957596,0.012786865,-0.03314209,-0.0112838745,-0.021560669,0.0057373047,-0.0141067505,0.014694214,0.016036987,0.035980225,0.025863647,-0.018829346,-0.000024557114,-0.018692017,-0.009429932,-0.0042304993,-0.020523071,-0.020751953,0.027038574,0.017791748,-0.0154800415,-0.0151901245,0.032287598,-0.031173706,0.003932953,0.026245117,0.041259766,0.0068511963,0.024627686,-0.02128601,0.0024471283,-0.0181427,0.00014305115,-0.011169434,0.00579834,0.010620117,0.00028777122,-0.00074005127,0.0093307495,0.017089844,-0.011634827,-0.014472961,0.032073975,0.016143799,-0.021713257,0.037628174,0.018875122,0.015205383,-0.005947113,-0.004550934,0.02520752,0.05822754,0.007865906,0.019699097,0.00573349,0.008178711,-0.003320694,0.011062622,0.0151901245,-0.021377563,-0.052947998,-0.028503418,-0.03302002,0.01675415,0.0041999817,0.0055160522,-0.013786316,0.013137817,-0.020370483,-0.04348755,-0.01777649,0.032287598,0.0061531067,-0.014762878,-0.011291504,0.010681152,0.027694702,-0.031173706,0.002412796,-0.036254883,-0.033447266,-0.0053710938,-0.020904541,0.025909424,0.007774353,-0.008888245,-0.0005545616,-0.007873535,-0.0049858093,-0.0067329407,0.037353516,-0.014320374,0.004753113,0.015808105,0.026916504,-0.019622803,0.018829346,-0.017501831,-0.0047798157,0.0077667236,-0.008155823,0.015090942,-0.019485474,0.03265381,-0.012191772,0.0058174133,0.033111572,-0.0065841675,0.013702393,-0.023284912,0.0075302124,-0.005504608,-0.008201599,0.039245605,-0.02104187,-0.017120361,0.0077667236,-0.013534546,-0.021240234,-0.004966736,0.017074585,0.03466797,-0.0053482056,0.050811768,-0.013824463,0.0010204315,0.005680084,0.008033752,-0.017669678,0.008598328,0.024536133,0.00869751,-0.001581192,-0.007904053,-0.0096588135,-0.025497437,-0.0105896,0.017837524,-0.00013625622,-0.014099121,0.02619934,0.015037537,0.046539307,-0.00033903122,0.016937256,0.014656067,0.0013256073,0.031402588,-0.002544403,0.04953003,-0.008705139,-0.034057617,0.009231567,-0.0043411255,-0.020492554,-0.0053710938,0.0029697418,-0.0024356842,-0.040863037,0.0059890747,-0.007850647,0.030151367,-0.020980835,0.012367249,-0.022598267,0.0008869171,-0.039794922,-0.010284424,-0.03878784,0.015060425,0.033813477,-0.003993988,0.028686523,-0.000115036964,-0.017669678,0.028762817,0.050109863,0.0011034012,-0.022583008,-0.016815186,0.011627197,0.0005364418,0.008605957,0.005393982,-0.0090408325,-0.008903503,0.005382538,-0.023010254,0.009887695,-0.01689148,0.020614624,0.005680084,0.0023994446,-0.012336731,0.017456055,-0.0064735413,-0.009155273,0.013137817,0.012336731,0.034057617,0.029663086,-0.022506714,0.025146484,0.013900757,-0.035308838,0.05883789,-0.0019235611,0.039154053,-0.01687622,0.009605408,-0.034240723,-0.02558899,-0.016586304,0.011947632],"createdAt":"2026-04-18T18:44:38.699Z","updatedAt":"2026-04-23T10:00:48.141Z","lastSeenAt":"2026-04-23T10:00:48.141Z","tsv":"'/api/v1/charges/200':93,225 '/request':19,38 '0.02':18,37,111,157 '000':105 '20':104 'Base network API' 'USDC micropayment API' 'access':99 'actual':218 'address':179 'advertis':116 'ai':12,31,57,128 'ai-inference' 'analysi':131 'analyt':56,122 'api':5,24,45,80,98,120,186 'base':8,27,76,106,174 'behavior':219 'beyond':232 'broad':50 'call':4,23,113 'categori':118 'challeng':236 'charg':101 'classif':134 'classification' 'commit':87 'connect':195 'content':201 'convers':150 'conversion' 'crypto-paid API' 'data':11,30,55,121,125 'data-analytics' 'detail':212 'doc':185 'document':180,213 'embed':135 'embeddings' 'enabl':44 'endpoint':16,35,53,66,91,216,226 'estim':145 'exact':168 'exampl':209 'exchang':140 'export':126 'extrem':182 'feed':139 'financ':13,32,60,136 'finance-data' 'format':222 'four':117 'gas':144 'generat':151 'geocod':148 'geocoding' 'handl':162 'i.e':110 'infrastructur':63,147 'insight':127 'key':81 'learn':59 'limit':84 'list':95 'low fee API' 'lowpaymentfee.com':39 'machin':58 'metric':123 'ml':129 'network':77 'offer':48 'openapi':205 'other':229 'page':190 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'paye':178 'payment':160 'per':3,22,70,112,158 'per-request':69 'per-request-billing' 'platform':6,25,46,115 'premium':97 'price':138,154,187 'prompt':197 'protocol':166 'quot':143 'rate':83,141 'readm':189 'render':192 'report':124 'request':71,159 'request/response':208 'requir':88 'respons':221 'reveal':237 'schema':206 'scheme':169 'sentiment':130 'sentiment-analysis' 'settl':170 'span':54 'spars':183 'specif':90 'specifi':177 'substant':200 'suit':51 'summar':133 'text':132 'text-summarization' 'token':142 'uniform':155 'unit':107 'unknown':231 'usdc':73,109,172 'usdc-base' 'use':72 'util':15,34,64 'valid':149 'validation' 'via':9,28,163 'wallet':196 'web3':61,137 'x402':10,29,43,165,235 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0f01b355-c3ac-4367-a0eb-c7b3fe05198b","listingId":"c77fc7c3-587a-4c85-89eb-5143d836420b","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/charges/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:38.699Z"}],"sources":[{"listingId":"c77fc7c3-587a-4c85-89eb-5143d836420b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:38.699Z","lastSeenAt":"2026-04-23T10:00:48.141Z"}],"details":{"listingId":"c77fc7c3-587a-4c85-89eb-5143d836420b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/200 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/200"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, or gas estimates via micropayment","Running utility tasks like geocoding, validation, or data conversion with per-call billing"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents on the Base network looking for cheap per-call endpoints","Prototyping workflows that need diverse API capabilities without rate limits"],"notFor":["Production systems requiring well-documented, schema-validated APIs with guaranteed SLAs","Users who need free or subscription-based pricing models","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.801Z"},"updatedAt":"2026-04-23T10:00:48.141Z"}}