{"id":"0d1e58f0-2569-4f01-bb8e-969d4c2f3f19","shortId":"XmVbF5","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/37` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing.\n\nThe specific purpose of the `/api/v1/keys/37` endpoint is unclear from the available documentation — it is described only as \"Premium API Access\" and returns `application/json`. There is no OpenAPI spec, no request/response schema documentation, and the crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. Callers should treat this as a minimally documented endpoint until more information is available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The purpose of /api/v1/keys/37 ('Premium API Access') is not explained anywhere in the crawled material","Crawled /api, /pricing, and /README pages all returned only 'Connect wallet' with no documentation","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/37","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/keys/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no examples, and the endpoint's actual functionality (\"Premium API Access\") is completely undocumented. The /api, /pricing, and /README pages returned no useful content.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-21T22:10:46.923Z","embedding":[-0.018081665,-0.013404846,0.050750732,0.0128479,0.033996582,-0.04248047,-0.027801514,0.04510498,0.07043457,-0.07446289,0.014831543,-0.05026245,-0.031021118,-0.040039062,-0.03857422,-0.0059051514,-0.00712204,0.0104904175,-0.041015625,0.03817749,0.00932312,-0.029586792,-0.018798828,0.02394104,0.0000035762787,-0.011924744,-0.0005750656,-0.031463623,-0.012321472,-0.029388428,0.055847168,-0.022583008,-0.014770508,0.012878418,-0.030349731,-0.016326904,-0.013572693,0.024917603,0.019958496,0.003206253,-0.011940002,-0.05545044,0.0047302246,-0.009361267,-0.05050659,-0.00920105,-0.0101623535,-0.018966675,0.003168106,-0.0042762756,-0.033691406,-0.026275635,-0.009124756,0.00573349,0.009239197,0.0021648407,-0.0079193115,-0.036224365,0.01966858,0.0043144226,0.013000488,-0.060302734,-0.016357422,-0.0010309219,0.004875183,0.0519104,-0.013298035,0.058624268,0.014015198,0.044006348,0.030715942,0.042144775,0.020233154,0.01789856,-0.0023288727,0.006126404,-0.01828003,0.057800293,-0.018417358,-0.014083862,-0.01927185,-0.0026302338,-0.025665283,0.0017404556,-0.007873535,-0.04522705,-0.027770996,-0.010147095,-0.026779175,0.022491455,-0.08459473,-0.036499023,0.004432678,0.008872986,0.016082764,-0.003736496,-0.012588501,0.017242432,-0.023345947,0.022125244,-0.006919861,-0.03225708,0.01701355,0.019882202,0.039093018,0.035858154,0.011856079,0.020477295,0.016098022,-0.014770508,-0.06341553,-0.0062828064,-0.027160645,-0.011413574,0.018310547,0.0062789917,-0.015174866,0.0129852295,-0.03753662,0.002576828,-0.048980713,0.033996582,0.02949524,0.006095886,0.0025100708,-0.04647827,-0.004760742,0.013763428,-0.022903442,-0.031555176,0.0027484894,0.009674072,0.023910522,-0.017791748,-0.039215088,-0.00016832352,0.00047945976,-0.023376465,-0.0435791,-0.037719727,0.027694702,-0.026123047,0.027236938,0.03326416,-0.111816406,-0.010643005,-0.047576904,0.015289307,-0.037902832,0.0035896301,-0.010902405,0.033996582,-0.009544373,-0.018218994,-0.01083374,-0.028335571,0.0040130615,0.027267456,-0.020217896,0.053100586,-0.026000977,0.041870117,0.02961731,0.013366699,0.024124146,0.023422241,0.007724762,-0.08081055,-0.08215332,-0.011932373,-0.011756897,-0.028015137,-0.029251099,0.012901306,-0.024963379,-0.0552063,-0.010414124,-0.016342163,0.0036678314,-0.036132812,-0.015357971,-0.015686035,0.011817932,-0.008888245,-0.04522705,-0.01663208,-0.02558899,0.056030273,0.0056114197,0.026443481,0.027191162,-0.016860962,0.068603516,0.022613525,-0.018295288,-0.023757935,-0.0020961761,-0.020248413,0.017532349,-0.00793457,0.0044517517,-0.0446167,0.03564453,0.060302734,0.017242432,-0.008338928,-0.022994995,-0.049438477,-0.02923584,-0.04196167,0.027694702,0.0066184998,-0.0029125214,0.039764404,-0.033996582,-0.029586792,-0.007949829,0.01423645,0.015838623,0.07501221,0.0025997162,-0.01197052,0.016159058,0.026779175,-0.0501709,0.03225708,0.021209717,0.0071411133,-0.02041626,-0.012641907,0.029571533,0.03074646,-0.019485474,0.0024261475,-0.02659607,0.028213501,-0.017074585,0.0010147095,0.019607544,-0.01309967,-0.017074585,-0.034057617,-0.046142578,0.036315918,0.00042295456,-0.018814087,-0.026321411,-0.085754395,0.048675537,0.03616333,0.044311523,-0.014083862,0.020721436,-0.016952515,-0.00050354004,-0.06732178,0.041412354,0.082336426,0.015457153,-0.027313232,0.020706177,-0.014007568,-0.011413574,0.009941101,-0.0109939575,-0.046020508,-0.008071899,0.010299683,-0.05819702,-0.0047950745,0.019760132,0.022872925,0.057891846,-0.010139465,-0.039367676,-0.012191772,-0.010787964,-0.008232117,-0.0309906,-0.019332886,-0.0057525635,0.0005893707,0.03366089,-0.00869751,0.01574707,-0.006690979,0.006362915,0.003036499,-0.018310547,-0.022384644,-0.023162842,0.016983032,0.024673462,-0.055511475,0.009155273,-0.008720398,0.07208252,-0.03427124,0.03375244,-0.018966675,0.0181427,0.035064697,-0.0068740845,-0.043518066,0.004535675,0.024353027,0.030532837,0.03866577,0.0030155182,-0.03439331,-0.008262634,0.080322266,-0.0077438354,-0.0095825195,-0.009300232,-0.004699707,0.035064697,-0.0231781,-0.059906006,-0.026931763,-0.019729614,-0.04107666,0.00894928,-0.02507019,0.016571045,0.0052986145,-0.00036644936,-0.024978638,0.01133728,-0.020324707,0.037750244,-0.033813477,0.007434845,-0.026779175,-0.026245117,0.010223389,0.01802063,-0.009384155,-0.013328552,0.03074646,0.030639648,-0.02027893,-0.032592773,-0.023269653,-0.002861023,0.0021038055,0.023071289,0.01373291,0.019348145,0.035339355,-0.0059776306,0.0014486313,0.03289795,0.021362305,0.03665161,-0.0037593842,0.010986328,-0.0715332,-0.054016113,-0.023010254,-0.026657104,0.013633728,0.015586853,-0.004135132,0.049316406,-0.00819397,-0.029693604,-0.046905518,0.039611816,-0.03656006,-0.004043579,0.030303955,-0.020736694,-0.031173706,-0.008239746,-0.0016946793,0.00283432,0.05038452,0.009384155,0.026885986,0.079833984,0.04663086,-0.014694214,0.01927185,0.0041122437,0.021362305,0.012931824,-0.016830444,-0.03074646,-0.0014133453,0.03338623,-0.016738892,-0.025909424,-0.08532715,0.06689453,0.050811768,0.06036377,0.009208679,0.010787964,0.038360596,-0.022857666,0.008392334,-0.007587433,0.0011835098,-0.008300781,-0.0491333,0.03253174,-0.014160156,0.011985779,-0.04159546,0.048553467,0.0003888607,0.022613525,-0.040130615,0.06149292,-0.0020751953,0.008544922,0.01146698,0.010383606,0.041290283,0.057861328,-0.045135498,0.014984131,0.028259277,-0.032409668,0.016555786,0.046081543,-0.008880615,-0.015625,-0.0625,-0.013214111,0.0013694763,0.0019798279,-0.059448242,0.012748718,0.008911133,0.0131073,0.024505615,-0.021347046,-0.011161804,-0.015670776,-0.026443481,-0.06298828,0.0033740997,-0.03768921,0.0016422272,0.040740967,-0.029022217,-0.029342651,0.008346558,-0.02180481,-0.014205933,0.010795593,0.02897644,0.007499695,-0.045318604,0.040130615,0.018936157,0.0025253296,0.009742737,0.00844574,0.01448822,0.0234375,0.04925537,-0.002029419,-0.0256958,-0.06530762,0.027496338,-0.055389404,0.002609253,0.01991272,-0.02659607,0.006259918,-0.0057525635,-0.027618408,-0.024261475,0.0025978088,-0.04537964,0.0025138855,0.014656067,-0.028259277,-0.023254395,-0.064819336,-0.013694763,-0.0042495728,0.072509766,0.027236938,-0.0065727234,-0.049102783,-0.0027008057,0.0072135925,0.004047394,0.03942871,-0.013618469,-0.015419006,0.0014181137,-0.024520874,-0.011077881,-0.021514893,0.028930664,-0.0074691772,-0.018310547,0.03274536,0.020980835,0.0058021545,0.025375366,0.016799927,0.007987976,-0.03274536,0.0047798157,-0.0024356842,0.0473938,-0.0016384125,-0.015487671,-0.04168701,0.039245605,0.01625061,0.022354126,-0.027526855,-0.006626129,-0.015731812,0.015037537,0.015625,-0.013786316,-0.017227173,-0.0058898926,-0.05178833,-0.05319214,0.03692627,-0.034973145,0.025268555,0.01889038,0.010765076,0.019622803,-0.0109939575,0.0056877136,0.03338623,-0.027832031,-0.00982666,-0.022644043,-0.042114258,-0.018157959,0.012367249,-0.024002075,0.013801575,-0.014884949,0.017623901,-0.0032196045,-0.021102905,0.02029419,0.010421753,-0.0075302124,0.023483276,0.008628845,0.019424438,0.047424316,0.006298065,-0.04727173,0.030532837,0.00059604645,0.02456665,-0.0046806335,0.03616333,0.03982544,-0.014656067,-0.01184082,0.0068855286,-0.017837524,-0.018981934,-0.0050964355,0.010864258,0.013694763,-0.025100708,-0.056274414,0.0129776,0.019561768,-0.036956787,-0.0184021,0.029006958,0.013175964,-0.028289795,0.023208618,0.018814087,0.052124023,-0.030838013,0.012031555,0.021835327,0.03137207,0.023361206,0.00072956085,-0.002779007,0.014732361,-0.02949524,0.009963989,-0.014015198,0.010253906,0.02810669,0.0011987686,0.016052246,0.03375244,0.01612854,-0.013336182,-0.03768921,0.0068244934,-0.016937256,-0.016677856,0.014320374,0.014541626,0.015457153,-0.023498535,0.0143585205,0.01309967,-0.023620605,-0.008079529,-0.0041389465,0.026626587,-0.010093689,-0.0121536255,0.018844604,0.003276825,0.016494751,-0.04119873,-0.008171082,0.0067100525,0.016967773,-0.02734375,-0.048919678,-0.043884277,0.01574707,0.042053223,-0.0016374588,0.022979736,0.036224365,-0.000050723553,-0.00043082237,0.03375244,0.0010595322,-0.030715942,-0.01864624,-0.027801514,-0.027908325,-0.004611969,0.0016498566,-0.023422241,0.02017212,0.0010547638,-0.036376953,0.0073394775,-0.014450073,-0.009757996,-0.010971069,-0.007888794,0.02458191,0.013420105,0.0181427,-0.015205383,-0.029769897,0.0013952255,0.005706787,0.024017334,-0.052093506,0.024414062,-0.0058403015,-0.016540527,-0.0067329407,0.019348145,0.0105896,0.02848816,0.013763428,0.02520752,-0.050872803,0.05493164,-0.03692627,0.021865845,0.00072574615,-0.038391113,0.0016994476,-0.023605347,-0.028213501,0.041503906,-0.010528564,-0.021209717,-0.028442383,-0.028823853,-0.011260986,-0.044708252,0.025222778,0.04083252,0.03881836,-0.026245117,0.008232117,0.00881958,0.0009937286,-0.009117126,-0.0026607513,0.0012197495,0.009391785,0.021850586,-0.006919861,-0.015701294,-0.0284729,-0.015419006,-0.024673462,-0.03463745,-0.05633545,0.0088272095,0.017807007,-0.00078487396,-0.008163452,-0.023620605,-0.024261475,0.002374649,-0.03881836,-0.0010957718,-0.0022964478,0.0096206665,-0.0030212402,-0.021133423,0.025299072,0.027191162,-0.024261475,0.034179688,0.0075302124,-0.0008134842,-0.033447266,0.018218994,0.028320312,0.00932312,0.01247406,-0.014549255,-0.009437561,-0.0121154785,-0.049316406,-0.00881958,0.00088500977,-0.011764526,-0.00919342,-0.0025177002,-0.04660034,-0.009887695,-0.0013189316,0.00018632412,0.028549194,0.032226562,0.0060920715,0.002035141,0.020202637,-0.0075187683,-0.018478394,-0.032806396,0.020462036,0.010002136,-0.00415802,0.033691406,0.046020508,0.016113281,-0.0077934265,0.006767273,0.014823914,0.033996582,-0.015098572,0.001537323,-0.015548706,0.019134521,0.0021896362,-0.0206604,-0.031219482,-0.005996704,0.078063965,0.0076026917,-0.012313843,-0.011116028,-0.017059326,0.011543274,0.011489868,-0.058929443,0.0041923523,-0.033843994,0.009933472,-0.013420105,0.027679443,0.0024547577,0.009590149,-0.016342163,-0.044128418,-0.007888794,-0.00018239021,-0.011894226,-0.06616211,-0.01713562,-0.0435791,0.0029296875,0.0037250519,-0.026550293,0.0041542053,-0.0062217712,-0.013175964,-0.07495117,0.015281677,0.03555298,0.0069503784,0.029205322,-0.013648987,0.013259888,0.017471313,-0.028060913,-0.0028934479,0.025344849,-0.028411865,-0.016952515,-0.01727295,0.018356323,-0.007850647,-0.03112793,0.008377075,-0.007385254,0.032165527,-0.0026817322,0.009819031,0.0018482208,0.01902771,-0.035217285,0.016830444,-0.004196167,-0.000333786,0.033966064,-0.04586792,0.024795532,0.018249512,0.0045661926,0.006904602,0.023117065,0.038482666,-0.037261963,-0.015357971,0.018569946,-0.004940033,0.028015137,-0.035369873,0.04421997,0.029022217,-0.014945984,0.023162842,-0.00014162064,-0.008453369,-0.042266846,-0.026657104,0.035980225,0.013916016,0.008888245,-0.022613525,0.014503479,0.037231445,-0.015472412,0.012054443,-0.022872925,-0.020126343,-0.02230835,-0.017227173,0.0016994476,-0.0055503845,-0.0052261353,0.021331787,0.009635925,0.032287598,0.010765076,-0.009635925,0.013885498,0.01751709,-0.0112838745,0.0032424927,0.019241333,0.007762909,0.005924225,0.019577026,0.009529114,-0.048919678,0.007217407,-0.035858154,-0.028442383,0.004951477,-0.0029029846,-0.02848816,-0.011474609,0.0045814514,-0.00049877167,-0.03427124,0.0077171326,-0.02583313,-0.02746582,-0.0052833557,-0.013648987,0.018096924,-0.0009112358,0.013671875,0.016693115,0.008575439,0.057128906,0.010414124,-0.007801056,0.02772522,0.03125,0.014312744,-0.028671265,-0.009681702,-0.007762909,0.017318726,0.0037403107,-0.023605347,0.018936157,0.036315918,-0.024002075,0.012260437,0.005771637,0.026428223,-0.030410767,-0.004878998,-0.011878967,0.022476196,-0.02027893,0.037139893,-0.037841797,0.023208618,0.015266418,0.0034713745,-0.003293991,-0.017044067,-0.018859863,0.016326904,-0.001964569,-0.024642944,0.052581787,-0.009536743,0.017456055,-0.0008778572,-0.006324768,0.013580322,-0.036346436,-0.025344849,0.033325195,-0.016433716,0.00016379356,0.007888794,-0.033050537,0.042236328,-0.038970947,-0.009513855,0.010757446,-0.0061950684,-0.015457153,-0.012611389,-0.014846802,-0.0008921623,-0.010543823,-0.0072250366,0.006412506,0.04638672,0.026062012,0.04220581,0.055389404,0.0063285828,0.0074539185,-0.03225708,-0.014450073,0.0027999878,-0.01802063,0.031341553,-0.0022144318,0.049804688,0.030563354,-0.0013456345,0.035827637,0.03765869,0.021636963,-0.0090789795,0.007911682,-0.0231781,0.012481689,-0.0050086975,0.02961731,-0.0023479462,0.044189453,-0.026107788,0.024734497,0.015823364,0.023895264,-0.03012085,0.040405273,0.07080078,0.023880005,-0.0045776367,0.028213501,-0.000623703,-0.009613037,-0.006587982,-0.020767212,0.068359375,0.011405945,0.04763794,0.03955078,0.0042495728,0.01802063,0.011619568,-0.024963379,-0.022537231,0.07696533,0.011489868,-0.0143585205,-0.009170532,-0.01159668,0.003545761,-0.042999268,-0.04321289,0.011772156,-0.018249512,0.008087158,-0.025482178,0.0026016235,-0.013618469,0.010253906,0.009719849,0.006587982,-0.0011301041,0.03375244,0.023483276,0.005191803,0.03149414,0.0060043335,0.02784729,-0.02468872,-0.047546387,0.01423645,0.017074585,-0.0035076141,-0.0042152405,0.018585205,0.0047912598,0.051940918,0.043060303,-0.020050049,0.019058228,0.03048706,0.011116028,-0.0012254715,0.055389404,0.033325195,0.009628296,0.025238037,0.03942871,0.039367676,-0.035217285,0.011505127,-0.000057160854,-0.0063171387,-0.0211792,-0.013725281,-0.0011987686,-0.0025253296,0.01197052,-0.0043640137,-0.016815186,0.023010254,0.02444458,-0.00034737587,0.0051078796,-0.011680603,0.0060653687,-0.0039901733,0.0053710938,0.016677856,-0.023284912,0.02243042,0.015686035,0.03289795,-0.017471313,0.021072388,0.008613586,-0.006931305,-0.01008606,0.028778076,-0.03201294,0.015052795,-0.0028686523,-0.00005143881,-0.050811768,0.016921997,0.015167236,0.00730896,0.031951904,0.017868042,-0.015525818,0.00058078766,-0.00025725365,0.0076522827,-0.0021343231,-0.010887146,-0.025360107,0.033203125,0.038879395,0.0027313232,0.016845703,-0.012672424,-0.0061416626,0.0023975372,-0.008300781,-0.00248909,-0.015167236,-0.01525116,-0.020645142,0.008560181,0.03640747,0.029724121,0.0519104,-0.006790161,-0.008934021,0.010665894,0.0335083,0.009918213,0.02218628,-0.0027828217,0.016616821,-0.0057754517,0.035308838,0.0418396,0.022277832,0.03729248,-0.026290894,-0.024353027,0.013427734,-0.0009794235,0.017242432,-0.0085372925,0.015823364,-0.0060043335,0.026275635,-0.024002075,-0.041168213,0.011917114,-0.021209717,-0.014984131,-0.017608643,0.004219055,-0.0018863678,0.033996582,0.049621582,0.030303955,-0.024810791,0.059539795,-0.0067710876,0.053985596,-0.0044059753,-0.028396606,0.03378296,0.02658081,0.02267456,0.011581421,0.012664795,-0.033416748,0.009231567,0.059295654,0.039489746,0.0035209656,0.0023422241,-0.011329651,0.028793335,0.011619568,0.03314209,-0.006866455,0.0024642944,0.020141602,0.00025820732,-0.01461792,-0.0029716492,-0.0024051666,-0.0023345947,0.04019165,-0.03744507,-0.009498596,-0.024276733,-0.006454468,0.021514893,-0.01612854,0.008651733,-0.01121521,-0.035980225,0.009010315,-0.033721924,-0.016204834,-0.016296387,0.022659302,-0.034301758,-0.011802673,-0.010620117,0.020889282,-0.012641907,0.026428223,0.025817871,-0.0074424744,0.015075684,0.04498291,-0.019134521,0.0317688,-0.009803772,0.016525269,0.039123535,-0.008575439,-0.019424438,-0.005329132,0.0059776306,-0.019973755,0.027542114,0.033843994,-0.01802063,0.0032539368,0.0012760162,-0.019592285,-0.00920105,-0.0013065338,0.0004992485,0.0043907166,0.0038261414,-0.005458832,-0.009918213,0.0066452026,0.009124756,-0.00024604797,-0.0284729,-0.024169922,0.018035889,0.03439331,0.016204834,-0.026626587,-0.013183594,0.0074539185,0.010688782,-0.00793457,-0.015655518,-0.022476196,-0.034851074,0.013877869,0.019104004,0.010643005,0.01424408,-0.025741577,-0.003200531,0.012237549,-0.0020065308,0.0026512146,0.0009007454,-0.020263672,0.006843567,-0.011306763,-0.029510498,-0.013404846,-0.012046814,0.01235199,0.029571533,0.005672455,-0.024169922,0.01739502,-0.006996155,0.02394104,0.009277344,-0.012245178,0.02218628,-0.015014648,-0.008049011,0.00042128563,0.016906738,-0.019226074,-0.017211914,-0.020706177,0.030197144,0.041656494,-0.0035648346,-0.011543274,0.023635864,0.008781433,0.022079468,0.04144287,0.01109314,0.033966064,0.026504517,-0.009262085,-0.020950317,0.011695862,-0.0060272217,-0.02053833,0.0072250366,-0.0041389465,-0.024093628,0.033569336,0.009292603,-0.0067596436,-0.014205933,-0.010368347,0.007801056,-0.009384155,0.023773193,-0.019638062,0.020111084,-0.010475159,-0.009361267,-0.009437561,-0.0087890625,-0.05001831,-0.024215698,0.0074920654,0.00045871735,-0.04949951,-0.0038490295,-0.040222168,0.012748718,-0.015823364,-0.016586304,-0.0027675629,0.03060913,-0.005443573,0.022521973,-0.0020599365,0.026367188,0.021835327,0.011940002,0.024337769,-0.014808655,-0.024749756,-0.021911621,0.0109939575,-0.010925293,0.020935059,0.016296387,0.0368042,0.02104187,0.0053863525,-0.003479004,-0.00050878525,-0.015174866,-0.0041122437,-0.019180298,-0.019485474,0.018722534,0.008575439,-0.007385254,-0.0085372925,0.04510498,-0.033203125,-0.0010766983,0.028213501,0.05508423,0.013427734,0.03189087,-0.018661499,-0.0016088486,0.000026524067,-0.0006341934,-0.025787354,0.011756897,0.020980835,0.008491516,-0.0070228577,0.00056123734,0.005771637,-0.01979065,-0.01727295,0.011558533,0.006336212,-0.010765076,0.034454346,0.017486572,0.003692627,-0.021453857,-0.022598267,0.019134521,0.046081543,0.018966675,0.023406982,0.0017442703,0.004802704,-0.023132324,0.012527466,0.004322052,-0.022613525,-0.042419434,-0.018325806,-0.030029297,0.02027893,0.0049209595,0.011543274,0.009613037,0.013809204,-0.012763977,-0.030334473,-0.021942139,0.023254395,0.0015468597,-0.011665344,-0.024475098,0.00093126297,0.011123657,-0.024429321,0.008239746,-0.037109375,-0.02519226,0.01197052,-0.022628784,0.016601562,0.0019664764,-0.00006300211,0.0026626587,-0.017700195,0.0036735535,-0.014160156,0.021484375,-0.015731812,0.0070228577,0.011581421,0.014541626,-0.0079956055,0.010353088,-0.00012493134,0.005367279,0.021438599,-0.0072364807,0.013038635,-0.020828247,0.03555298,-0.004886627,0.0003745556,0.041381836,-0.0046081543,0.01197052,-0.03881836,0.003107071,0.0004143715,-0.000705719,0.05340576,-0.026657104,-0.020874023,0.010650635,-0.021392822,-0.023544312,0.00044751167,0.030914307,0.033233643,-0.01108551,0.047576904,-0.00045704842,0.008377075,0.0075187683,0.010696411,-0.017059326,-0.007785797,0.04928589,0.014411926,-0.0026073456,-0.0037498474,-0.0035514832,-0.04550171,-0.00995636,0.013290405,0.0005631447,-0.014709473,0.021408081,0.0069618225,0.031829834,-0.010063171,0.0037631989,0.014030457,0.0031833649,0.025054932,0.004837036,0.041381836,-0.0036640167,-0.035583496,0.004989624,0.013618469,-0.015304565,-0.0016727448,-0.0027751923,-0.010795593,-0.029052734,0.025436401,-0.00074338913,0.02407837,-0.024749756,0.006629944,-0.018600464,-0.013656616,-0.04034424,-0.022460938,-0.037139893,0.0024776459,0.04055786,-0.001499176,0.024765015,0.0052452087,-0.007461548,0.030258179,0.049835205,0.007736206,-0.027069092,-0.0037975311,0.0064582825,-0.005241394,0.011871338,0.016464233,-0.018234253,-0.009590149,0.0129470825,-0.02508545,0.012954712,0.013420105,0.011741638,0.0013904572,-0.008255005,-0.009513855,0.025436401,-0.007347107,0.0032997131,-0.0004911423,0.014831543,0.06414795,0.01940918,-0.010406494,0.01663208,0.008720398,-0.031341553,0.05709839,-0.00868988,0.024780273,-0.0181427,0.0033454895,-0.044555664,-0.020935059,-0.011230469,0.009384155],"createdAt":"2026-04-21T18:32:23.238Z","updatedAt":"2026-04-22T10:02:58.924Z","lastSeenAt":"2026-04-22T10:02:58.924Z","tsv":"'/api':196 '/api/v1/keys/37':69,165 '/pricing':197 '/readme':199 '/request':19,38,158 '0.02':18,37,80,157 '000':84 '20':83 '6':90 'access':75,180 'addit':210 'advertis':114 'ai':12,31,125 'analysi':129 'analyt':119 'api':5,24,45,74,93,179 'application/json':183 'attach':104 'avail':171,225 'base':8,27,63,85 'base network api' 'base-network' 'broad':50 'call':4,23,82 'caller':102,212 'catalog':51 'categori':117 'classif':132 'commit':99 'connect':205 'content':211 'convers':149 'cost':77 'cover':10,29 'crawl':195 'data':11,30,118,122 'decim':91 'describ':175 'document':172,192,219 'embed':133 'enabl':44 'endpoint':16,35,57,67,116,153,166,220 'estim':143 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'four':115 'gas':142 'generat':150 'geocod':147 'header':108 'inform':223 'infrastructur':145 'insight':124 'json-response' 'key':94 'learn':127 'limit':96 'list':71,152 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'metric':120 'micropayment api' 'minim':218 'network':64 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':187 'page':200 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':107 'per':3,22,55,81 'platform':6,25,46,113 'premium':73,178 'premium api access' 'price':136,159 'prompt':207 'purpos':162 'quot':141 'rate':95,139 'report':121 'request':56,111 'request/response':190 'requir':101 'return':182,202 'schema':191 'sentiment':128 'settl':58 'share':154 'simpli':103 'spec':188 'specif':66,161 'summar':131 'text':130 'token':140 'treat':214 'unclear':168 'unit':86 'upfront':98 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,146 'valid':148 'wallet':206 'web3':135 'x402':43,106 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"506e971a-da31-404b-b032-2953002dbb18","listingId":"0d1e58f0-2569-4f01-bb8e-969d4c2f3f19","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/keys/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.238Z"}],"sources":[{"listingId":"0d1e58f0-2569-4f01-bb8e-969d4c2f3f19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.238Z","lastSeenAt":"2026-04-22T10:02:58.924Z"}],"details":{"listingId":"0d1e58f0-2569-4f01-bb8e-969d4c2f3f19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/37 \\\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":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/37"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/37"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API key registration","Agent-driven workflows that need on-demand API access settled in USDC on Base","Testing x402 payment flows against a live endpoint with low per-request cost"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol integrators looking for a live test endpoint","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.141Z"},"updatedAt":"2026-04-22T10:02:58.924Z"}}