{"id":"75c3978b-56e9-4cd7-b9d6-9cfcae9294e1","shortId":"45BVwx","kind":"x402","title":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com is a platform offering a suite of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/apikeys/4` is labeled \"Premium API Access\" and accepts POST requests with an x402 payment of up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call.\n\nThe broader platform lists endpoints across four 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 endpoints are priced at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/apikeys/4`) appears to be for generating or retrieving a premium API key, though the exact response payload is undocumented.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","api-key-generation","no-rate-limits"],"categories":["infrastructure","api-management"],"synonyms":["premium API key","x402 API access","pay-per-call API","USDC API payment","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are completely unknown","Docs, pricing, API, and README pages all render only 'Connect wallet' with no usable content","The exact behavior of /api/v1/apikeys/4 ('Premium API Access') is undocumented — it is unclear what is returned upon successful payment","Platform appears to be early-stage or a demo; the breadth of advertised endpoints (AI, finance, analytics, utilities) with no documentation raises reliability concerns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/4","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/apikeys/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific endpoint (apikeys/4) versus the broader platform offerings is unclear.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T15:16:13.496Z","embedding":[-0.006324768,-0.043670654,0.041625977,0.014564514,0.01084137,-0.048858643,-0.015029907,0.044006348,0.06866455,-0.08074951,0.018173218,-0.052856445,-0.039489746,-0.042755127,-0.03189087,0.0012311935,-0.022064209,-0.006629944,-0.048034668,0.014709473,0.02861023,-0.02909851,-0.015045166,0.04699707,0.0056533813,-0.01109314,-0.018875122,-0.02331543,-0.007835388,-0.028457642,0.046936035,-0.027557373,-0.014213562,0.020126343,-0.023864746,-0.006336212,0.00504303,0.020309448,0.023803711,-0.0006160736,-0.008148193,-0.07098389,0.019760132,0.00680542,-0.042663574,0.0031375885,-0.011230469,-0.032073975,0.0022182465,0.0010986328,-0.0340271,-0.008644104,-0.013710022,-0.0009741783,0.0014724731,0.009429932,-0.024353027,-0.027160645,0.004173279,0.0129852295,0.020233154,-0.051605225,-0.009681702,0.0033473969,0.0066986084,0.055145264,-0.010978699,0.051818848,0.016647339,0.048583984,0.027679443,0.05303955,0.020507812,0.01197052,-0.015220642,0.011550903,0.00059843063,0.070129395,-0.012512207,-0.01991272,-0.0070877075,0.0014381409,-0.04547119,0.008926392,-0.017623901,-0.055358887,-0.015930176,0.0051574707,-0.00025248528,0.029342651,-0.07910156,-0.021453857,-0.0058403015,0.0107421875,0.004463196,0.0056381226,-0.017166138,0.03050232,-0.017730713,0.017684937,-0.0010643005,-0.028869629,0.019180298,0.011329651,0.037719727,0.046691895,0.0010356903,0.015159607,-0.000705719,-0.0056114197,-0.045135498,-0.0025024414,-0.0211792,-0.021652222,0.008132935,-0.007587433,-0.0135269165,0.0026607513,-0.025131226,0.009376526,-0.051971436,0.052246094,0.024810791,0.0018901825,0.010215759,-0.047332764,-0.013656616,0.015975952,-0.016036987,-0.017868042,0.013389587,0.015792847,0.029205322,-0.0055885315,-0.036376953,0.008460999,-0.0061302185,-0.03213501,-0.046020508,-0.027297974,0.03173828,-0.025863647,0.020614624,0.028823853,-0.113220215,-0.021514893,-0.047576904,0.010696411,-0.030471802,-0.014305115,-0.0000038146973,0.018051147,-0.009269714,-0.00274086,0.0007390976,-0.02104187,-0.0066947937,0.03201294,-0.0067710876,0.051361084,-0.019058228,0.05697632,0.015014648,0.020996094,0.014175415,0.020507812,0.008987427,-0.0725708,-0.08105469,-0.02494812,-0.0028305054,-0.017166138,-0.02909851,0.030548096,-0.017974854,-0.07220459,-0.024917603,-0.0059509277,-0.013694763,-0.047912598,-0.005012512,-0.015007019,-0.0035114288,-0.008110046,-0.054229736,-0.0072631836,-0.009391785,0.05053711,0.02293396,0.016571045,0.03164673,-0.030181885,0.04586792,0.016860962,-0.011459351,-0.034942627,0.010505676,-0.03677368,0.0063323975,-0.0063285828,0.0008134842,-0.04058838,0.030685425,0.05493164,0.029846191,-0.015312195,-0.0031356812,-0.05303955,-0.03289795,-0.02798462,0.013908386,0.007911682,0.008590698,0.035736084,-0.0362854,-0.021972656,0.0072898865,0.01309967,0.0109939575,0.070129395,-0.0209198,-0.023834229,0.019836426,0.03286743,-0.04486084,0.043548584,0.02659607,0.010879517,-0.03137207,-0.012832642,0.028579712,0.04397583,-0.021911621,-0.0032749176,-0.03387451,0.015159607,-0.015777588,-0.002670288,0.021972656,-0.033843994,-0.016159058,-0.036987305,-0.031707764,0.042053223,-0.0047035217,-0.0034503937,-0.041870117,-0.061462402,0.04937744,0.02822876,0.033233643,-0.012825012,0.017944336,-0.0029678345,-0.007736206,-0.056915283,0.050354004,0.07745361,-0.0054855347,-0.014457703,0.019592285,-0.016113281,-0.039031982,0.0056419373,-0.007827759,-0.039093018,-0.029251099,0.02079773,-0.05001831,-0.004837036,0.023651123,0.03060913,0.05291748,-0.023910522,-0.026412964,-0.021850586,-0.015510559,0.0005354881,-0.04333496,-0.0036258698,-0.002981186,0.008323669,0.04135132,-0.014625549,0.02407837,-0.011642456,0.0023727417,-0.0021209717,-0.016693115,-0.024963379,-0.011169434,0.026977539,0.015914917,-0.053955078,0.017654419,-0.0060272217,0.06100464,-0.039520264,0.029724121,-0.0010118484,0.01612854,0.028305054,-0.0074501038,-0.050720215,-0.008003235,0.016952515,0.024276733,0.050201416,0.016998291,-0.016693115,-0.007335663,0.07348633,-0.031036377,-0.015510559,-0.0017700195,0.014671326,0.04083252,-0.01889038,-0.0748291,-0.0390625,-0.012329102,-0.04321289,0.018829346,-0.03036499,0.014328003,-0.007801056,-0.009353638,-0.028045654,0.013542175,-0.022232056,0.03564453,-0.02255249,0.015655518,-0.00982666,-0.021865845,-0.0067253113,0.021011353,-0.015640259,0.006790161,0.033172607,0.008178711,-0.0047302246,-0.028320312,-0.04272461,-0.011962891,-0.01197052,0.029159546,0.019973755,0.029052734,0.045654297,-0.024475098,0.01373291,0.021133423,0.012458801,0.04534912,-0.008369446,0.011779785,-0.06549072,-0.042388916,-0.027389526,-0.038635254,0.037109375,0.0037841797,-0.019958496,0.04458618,-0.008232117,-0.012283325,-0.049682617,0.015419006,-0.024978638,-0.026824951,0.04321289,-0.02204895,-0.03677368,0.012672424,-0.006462097,0.013084412,0.04425049,0.018493652,0.031463623,0.07556152,0.04800415,-0.007835388,0.009643555,0.008140564,0.015686035,0.0029659271,-0.031951904,-0.033721924,0.0134887695,0.019088745,-0.016921997,-0.022109985,-0.06347656,0.07873535,0.05291748,0.06903076,0.0011959076,0.008132935,0.050354004,-0.024154663,0.017791748,-0.006008148,-0.0135269165,-0.0075263977,-0.050109863,0.034210205,-0.0079574585,0.01361084,-0.029846191,0.046783447,0.005466461,0.018127441,-0.049743652,0.053131104,0.0012674332,-0.0069732666,0.011695862,0.0101623535,0.054382324,0.0395813,-0.05206299,0.01146698,0.015975952,-0.031799316,0.0070152283,0.033416748,-0.0064315796,-0.011688232,-0.05557251,-0.029022217,0.0011329651,-0.009178162,-0.062683105,-0.011016846,0.014625549,0.0031642914,0.034820557,-0.016845703,-0.016677856,-0.008598328,-0.02645874,-0.054229736,0.013427734,-0.06726074,0.0077667236,0.041534424,-0.04046631,-0.014289856,-0.0016317368,-0.009963989,-0.008460999,0.026489258,0.026931763,-0.00045228004,-0.044952393,0.017837524,0.009361267,-0.0087890625,0.018188477,0.016143799,0.021972656,0.025558472,0.043945312,0.003440857,-0.012931824,-0.066101074,0.028244019,-0.049438477,-0.007133484,0.01739502,-0.038635254,-0.0079193115,-0.019805908,-0.025909424,-0.022766113,0.00843811,-0.047576904,0.011512756,0.03302002,-0.017303467,-0.009979248,-0.055114746,-0.008903503,-0.016143799,0.06774902,0.02949524,0.012512207,-0.054626465,-0.006504059,0.00017607212,0.011581421,0.0317688,-0.014060974,0.006996155,-0.00667572,-0.0075798035,-0.012931824,-0.024887085,0.032226562,-0.008560181,-0.0058021545,0.023147583,0.023544312,0.015670776,0.020614624,0.012702942,0.033416748,-0.017593384,-0.00705719,-0.0071144104,0.025421143,-0.0041656494,-0.014602661,-0.043121338,0.03656006,0.010917664,0.03579712,-0.04058838,-0.0063552856,-0.011924744,0.009162903,0.0077285767,0.0068740845,-0.008972168,-0.013656616,-0.06573486,-0.06817627,0.027313232,-0.030883789,0.040771484,0.017532349,-0.009132385,0.017623901,-0.011398315,-0.013542175,0.040924072,-0.018478394,-0.004447937,-0.022415161,-0.03741455,-0.0058288574,0.013633728,-0.025253296,0.02067566,-0.022598267,0.014839172,-0.003414154,-0.01977539,0.018218994,0.0058937073,-0.009361267,0.011688232,0.0027122498,0.021896362,0.044433594,0.008377075,-0.030136108,0.030166626,0.013465881,0.010139465,0.008232117,0.04135132,0.035003662,-0.021957397,0.0040283203,-0.007255554,-0.003320694,-0.019622803,-0.006160736,0.0032215118,0.014915466,0.0043792725,-0.043029785,0.008605957,0.020248413,-0.029464722,-0.017059326,0.023147583,0.01651001,-0.029754639,0.0155181885,0.022415161,0.05114746,-0.020904541,-0.0023593903,0.00050354004,0.025009155,0.013694763,0.011657715,-0.0015001297,0.01222229,-0.015136719,0.011993408,-0.0053100586,0.0014762878,0.02229309,-0.003917694,0.011184692,0.023986816,0.0076179504,-0.0048942566,-0.05001831,-0.011917114,-0.020507812,-0.01802063,0.0031604767,0.032287598,0.015731812,-0.030761719,0.014808655,0.016906738,-0.021606445,-0.023483276,0.0016345978,0.043792725,-0.004360199,-0.011833191,0.012138367,0.009849548,0.035858154,-0.050750732,-0.010215759,0.013061523,0.011459351,-0.024841309,-0.04269409,-0.040649414,0.002500534,0.054901123,0.01133728,0.019577026,0.020629883,0.009933472,-0.010551453,0.033416748,0.005077362,-0.01574707,-0.018218994,-0.022964478,-0.0033302307,-0.0042495728,-0.0023460388,-0.019821167,0.008796692,-0.0028648376,-0.025665283,0.02178955,0.003622055,-0.007095337,-0.0118637085,0.0033035278,0.031219482,0.0038909912,0.024536133,-0.014076233,-0.020370483,0.0031776428,0.006893158,-0.002521515,-0.04977417,0.026977539,-0.019577026,-0.023101807,0.006099701,0.011955261,0.010185242,0.023117065,-0.006931305,0.035736084,-0.054779053,0.04788208,-0.06439209,0.01007843,-0.005317688,-0.023620605,-0.008811951,-0.023223877,-0.018920898,0.039001465,-0.03125,-0.0029449463,-0.03982544,-0.02645874,-0.0012817383,-0.042144775,0.025909424,0.038970947,0.034576416,-0.032409668,-0.0023288727,-0.007411957,0.0064849854,-0.018722534,0.009552002,-0.0079193115,0.02166748,0.019851685,-0.002822876,-0.032684326,-0.028747559,-0.0035629272,-0.0054893494,-0.028198242,-0.045135498,-0.0074691772,0.008575439,0.0011892319,-0.00066518784,-0.033172607,-0.017562866,0.0055770874,-0.036132812,0.008377075,-0.002090454,0.00497818,-0.0005841255,-0.007160187,0.011932373,0.028274536,-0.030319214,0.046936035,0.0030174255,-0.0019388199,-0.040222168,0.01260376,0.03366089,0.0072631836,-0.0061912537,0.0005912781,-0.014007568,-0.015510559,-0.04284668,-0.012420654,-0.002380371,-0.010093689,-0.003162384,0.0062332153,-0.052856445,-0.014884949,-0.023895264,-0.00048708916,0.026306152,0.040863037,0.016067505,-0.0044441223,0.021102905,-0.0051612854,-0.010848999,-0.032989502,0.0181427,0.010368347,0.0014781952,0.03338623,0.05593872,0.029830933,-0.0041275024,0.009933472,0.006866455,0.034057617,-0.009140015,0.003189087,-0.028121948,0.0063552856,0.007507324,-0.025390625,-0.027633667,-0.009086609,0.08337402,0.005180359,-0.02671814,-0.0054779053,-0.013916016,0.018707275,0.020370483,-0.05682373,0.002122879,-0.021057129,0.00818634,-0.021224976,0.010169983,-0.003572464,-0.00014698505,-0.0047798157,-0.055145264,-0.02381897,-0.0040512085,-0.0071983337,-0.07128906,-0.026229858,-0.05026245,-0.0001887083,-0.0033893585,-0.014419556,-0.009140015,0.010406494,-0.021072388,-0.07928467,0.0073776245,0.046173096,0.010597229,0.021499634,-0.019821167,-0.00090932846,0.01637268,-0.047454834,-0.012329102,0.024871826,-0.030761719,-0.016525269,-0.018493652,0.030548096,-0.031585693,-0.016494751,0.001584053,0.0031051636,0.03010559,-0.0055732727,0.0038642883,0.0025749207,0.018356323,-0.028060913,-0.0010318756,-0.0025348663,0.0038585663,0.02558899,-0.0496521,0.01586914,0.020645142,0.008987427,0.012573242,0.025009155,0.040130615,-0.04248047,-0.011497498,0.022857666,0.0032234192,0.038116455,-0.0340271,0.048309326,0.015777588,-0.02633667,0.035064697,0.004676819,-0.008743286,-0.043395996,-0.022064209,0.021026611,-0.0038051605,0.019882202,-0.020904541,0.0035858154,0.027709961,-0.0064582825,0.0181427,-0.022949219,-0.028015137,-0.023773193,-0.0063934326,0.0037345886,-0.0044555664,-0.00053453445,0.015945435,0.030166626,0.029907227,0.01197052,-0.012542725,0.008049011,0.021240234,-0.0038547516,0.0051345825,0.022018433,0.009468079,0.025283813,0.02494812,0.009529114,-0.040008545,-0.011505127,-0.04623413,-0.017425537,-0.0037155151,-0.014732361,-0.019332886,-0.01259613,0.016784668,0.0055732727,-0.02330017,0.013893127,-0.052337646,-0.024841309,0.0021705627,-0.019363403,0.014884949,-0.00356102,0.017822266,0.008354187,0.003692627,0.04348755,0.0126953125,-0.011276245,0.025558472,0.04083252,0.026641846,-0.024414062,-0.010154724,-0.018722534,0.0077552795,0.0048103333,-0.04046631,0.016204834,0.04525757,-0.026870728,0.01586914,0.014083862,0.015960693,-0.026565552,-0.0021705627,0.00029349327,0.018127441,-0.019927979,0.034240723,-0.03189087,0.02798462,0.0038051605,-0.006046295,0.005130768,-0.02218628,-0.035369873,-0.004627228,0.008171082,-0.023406982,0.04776001,-0.002866745,0.023345947,-0.01878357,-0.0155181885,0.016601562,-0.04498291,-0.024291992,0.028686523,-0.014122009,-0.012634277,0.0076179504,-0.021530151,0.045440674,-0.029205322,0.010093689,0.009338379,-0.012123108,-0.0109939575,-0.0064735413,-0.013031006,0.0030288696,0.000012218952,-0.006126404,0.0035438538,0.04449463,0.03086853,0.02822876,0.054229736,0.012893677,-0.014785767,-0.038635254,-0.017456055,0.00077295303,-0.011383057,0.020584106,-0.0048675537,0.050964355,0.029800415,0.008331299,0.029830933,0.027709961,0.018997192,-0.00073957443,0.0022659302,-0.014022827,0.02078247,0.0035076141,0.038085938,-0.009529114,0.023422241,-0.043151855,0.026519775,0.01826477,0.0231781,-0.041229248,0.036224365,0.06365967,0.021743774,-0.018325806,0.046783447,-0.0055389404,-0.0023822784,-0.020828247,-0.021331787,0.05130005,0.013214111,0.047454834,0.045898438,0.007106781,0.005973816,0.015945435,-0.029083252,-0.007507324,0.0703125,0.03564453,-0.023468018,-0.013954163,0.0059165955,0.009384155,-0.048034668,-0.040527344,0.015342712,-0.019866943,-0.0018186569,-0.019836426,-0.008384705,-0.026321411,0.012023926,0.02017212,0.0028705597,-0.015731812,0.032165527,0.025985718,-0.003932953,0.022888184,-0.003868103,0.023269653,-0.024765015,-0.03060913,0.016525269,0.03488159,-0.0036697388,-0.020843506,0.0030097961,0.01474762,0.053955078,0.042114258,-0.014083862,0.020431519,0.0209198,0.01083374,0.003194809,0.055419922,0.03353882,0.019592285,0.03604126,0.03112793,0.029281616,-0.043060303,0.01461792,0.013038635,0.0047340393,-0.015342712,-0.010765076,-0.0077285767,-0.029205322,0.010063171,0.0009379387,-0.016677856,0.029418945,0.026794434,0.00054883957,-0.000060081482,-0.00024175644,0.0033950806,-0.010360718,0.0001783371,0.010612488,-0.008811951,0.028411865,0.016815186,0.01927185,-0.029693604,0.023971558,0.00078344345,-0.019210815,-0.013748169,0.008300781,-0.03994751,0.0010194778,-0.0046958923,-0.001247406,-0.034210205,0.01939392,0.02772522,-0.0048065186,0.038909912,0.020507812,0.00030612946,-0.006843567,0.016540527,0.0065307617,0.006752014,-0.009124756,-0.02949524,0.004764557,0.028121948,0.00198555,0.017929077,-0.027114868,0.007736206,0.009063721,-0.021774292,0.003566742,-0.010124207,-0.026168823,-0.020309448,0.005329132,0.045410156,0.020202637,0.044952393,-0.0063705444,-0.008628845,0.02116394,0.034088135,0.0053977966,0.019821167,-0.0061035156,0.020187378,0.0021514893,0.044158936,0.030960083,0.019042969,0.03338623,-0.0104522705,-0.015686035,0.003271103,-0.0039367676,0.015701294,-0.010139465,0.006893158,0.0014400482,0.034179688,-0.012039185,-0.030273438,0.0034503937,-0.015014648,-0.018615723,-0.018203735,0.01725769,0.0032997131,0.030059814,0.04852295,0.028381348,-0.029342651,0.056854248,-0.0073928833,0.04586792,-0.01309967,-0.012306213,0.039642334,0.02633667,0.022979736,0.007457733,0.012168884,-0.019378662,0.01071167,0.05529785,0.035339355,0.0076828003,0.009880066,-0.02218628,0.02079773,0.0051727295,0.020584106,0.0070114136,-0.0059280396,0.008850098,-0.0075912476,-0.018341064,-0.00046229362,-0.012039185,0.00067281723,0.03878784,-0.047302246,-0.015014648,-0.029052734,-0.019760132,0.018814087,-0.016601562,0.00957489,-0.0031833649,-0.027572632,0.014877319,-0.024307251,-0.014915466,-0.01348114,0.032836914,-0.039276123,-0.013130188,-0.01134491,0.024154663,-0.016281128,0.015342712,0.02166748,-0.015327454,-0.0016784668,0.044403076,-0.01058197,0.035583496,-0.024673462,0.019622803,0.039733887,0.0028457642,-0.009353638,0.001906395,0.0007920265,-0.020614624,0.005126953,0.03024292,-0.022918701,0.010253906,0.0027542114,-0.009864807,0.004508972,0.0063934326,-0.0021305084,0.0030841827,-0.005672455,-0.004173279,-0.012794495,0.0154418945,-0.002155304,-0.009780884,-0.0007176399,-0.01424408,0.0068473816,0.016693115,0.012924194,-0.032684326,-0.013725281,0.019607544,0.023788452,-0.009796143,-0.010231018,-0.0056648254,-0.047058105,0.01626587,0.030883789,0.009857178,0.0043792725,-0.026901245,0.0021266937,0.017456055,0.017333984,0.0052757263,0.0025920868,-0.010299683,0.00056648254,-0.014877319,-0.026870728,-0.0128479,-0.009643555,0.011871338,0.04006958,-0.006072998,-0.028427124,0.014862061,-0.0022087097,0.02319336,0.0023765564,-0.018615723,0.017791748,-0.0078125,-0.013542175,0.0035476685,0.023620605,-0.029251099,-0.0050849915,-0.010696411,0.036071777,0.046844482,-0.01826477,-0.0056877136,0.0135650635,0.0037956238,0.018814087,0.023757935,0.0024700165,0.0446167,0.029830933,-0.014160156,-0.012313843,0.019058228,-0.008674622,-0.023971558,0.007873535,-0.013221741,-0.031982422,0.025054932,0.015159607,-0.0073394775,-0.039245605,-0.008682251,-0.0007195473,-0.0024909973,0.019973755,-0.011230469,0.015342712,-0.024475098,0.005657196,-0.005470276,-0.010375977,-0.041900635,-0.022842407,0.008201599,0.00027751923,-0.048919678,0.006931305,-0.029586792,0.004142761,-0.019622803,-0.012908936,0.001748085,0.014472961,-0.018936157,0.003129959,-0.0048942566,0.017044067,0.022735596,0.00077724457,0.034729004,-0.018692017,-0.020355225,-0.033599854,0.017959595,-0.0098724365,0.019622803,0.012069702,0.04360962,0.02696228,-0.000647068,-0.0005297661,-0.009231567,-0.0119018555,-0.01864624,-0.012649536,-0.019088745,0.026824951,0.010925293,-0.011764526,-0.008850098,0.041900635,-0.028244019,-0.011329651,0.023834229,0.05923462,-0.0034313202,0.03552246,-0.008705139,-0.012466431,-0.007888794,0.0009031296,-0.022399902,0.012672424,0.02268982,0.0031967163,-0.004650116,0.00023925304,0.014511108,-0.028015137,-0.0003809929,0.02406311,0.00073099136,-0.013191223,0.022415161,0.020690918,0.02027893,-0.013191223,-0.015670776,0.008255005,0.031143188,0.011100769,0.017028809,0.011299133,0.014694214,-0.02418518,0.006855011,0.007850647,-0.03010559,-0.035308838,-0.02293396,-0.033996582,0.012649536,0.018981934,0.010185242,-0.0054016113,0.0178833,-0.016967773,-0.037109375,-0.020141602,0.02796936,0.01751709,-0.008872986,-0.021713257,0.016830444,0.005908966,-0.026168823,0.00497818,-0.04269409,-0.032684326,0.014320374,-0.02671814,0.009269714,0.010978699,-0.0067634583,0.008514404,-0.008171082,0.010185242,-0.003873825,0.022354126,-0.004940033,0.0014266968,0.008865356,0.01474762,-0.0033397675,0.014083862,-0.0026931763,0.0012903214,0.033294678,-0.0042915344,0.009223938,-0.02015686,0.023834229,-0.014953613,-0.001871109,0.035888672,-0.0030670166,-0.007850647,-0.037322998,0.0039863586,-0.00762558,-0.0075263977,0.030807495,-0.028762817,-0.027008057,0.0065460205,-0.016799927,-0.018951416,-0.004585266,0.029724121,0.045440674,-0.015007019,0.041412354,-0.016174316,0.00030875206,0.018966675,-0.0025558472,-0.01979065,-0.0017948151,0.054992676,-0.0002605915,-0.010795593,-0.0050849915,-0.0043182373,-0.027313232,-0.009002686,0.021530151,-0.0011758804,-0.0063819885,0.02670288,0.005104065,0.03265381,-0.013694763,0.006881714,-0.0030460358,0.009231567,0.020706177,-0.000013291836,0.049682617,-0.0044174194,-0.03387451,0.004535675,0.023666382,-0.029312134,0.0028152466,-0.004558563,-0.0012760162,-0.041534424,0.016693115,-0.011375427,0.026443481,-0.03387451,0.0118637085,-0.02458191,-0.01058197,-0.032958984,-0.008453369,-0.029937744,-0.0019369125,0.03704834,0.001991272,0.021530151,-0.002122879,-0.023086548,0.034942627,0.04586792,-0.0023517609,-0.020446777,-0.007396698,0.0052948,-0.010536194,0.008270264,0.011238098,-0.025314331,-0.008430481,0.012840271,-0.015106201,0.01725769,0.001329422,0.009239197,0.0012350082,-0.002981186,-0.003967285,0.027420044,-0.004272461,-0.011184692,0.004753113,0.0025138855,0.056762695,0.016342163,-0.00957489,0.01889038,0.008361816,-0.025680542,0.06378174,-0.012550354,0.020004272,-0.020355225,0.00207901,-0.04248047,-0.02708435,-0.011253357,0.0037727356],"createdAt":"2026-04-18T19:29:29.016Z","updatedAt":"2026-04-23T08:02:07.684Z","lastSeenAt":"2026-04-23T08:02:07.684Z","tsv":"'/api/v1/apikeys/4':61,169 '0.02':12,28,85,159 '000':79 '20':78 '402':236 '6':89 'Base network API' 'USDC API payment' 'accept':68 'access':66,102 'across':118 'actual':242 'advertis':93 'ai':128 'analysi':132 'analyt':122 'api':5,21,45,65,95,179,194 'api-key-generation' 'appear':170 'attach':105 'avail':223 'base':9,25,53,80 'base-network' 'broader':114 'call':4,20,112 'categori':120 'challeng':238 'classif':135 'confirm':231 'connect':203 'content':209 'convers':152 'crawl':226 'data':121,125 'decim':90 'doc':193 'document':188,218 'embed':136 'endpoint':59,117,155,165,229 'estim':146 'exact':183 'exampl':222 'exchang':141 'export':126 'extrem':190 'feed':140 'financ':137 'four':119 'gas':145 'generat':7,23,153,174 'geocod':150 'given':86 'header':109 'howev':162 'i.e':84 'infrastructur':148 'insight':127 'instant':101 'key':6,22,96,180 'label':63 'learn':130 'limit':99 'list':116,167 'live':232 'lowpaymentfee.com':33 'machin':129 'materi':227 'metric':123 'micropayment API' 'network':54 'no-rate-limits' 'offer':37 'openapi':213 'page':198 'pay':2,18,42 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':41 'payload':185 'payment':74,108,246 'per':3,13,19,29,43,160 'platform':36,92,115 'post':69 'premium':64,178 'premium API key' 'price':139,157,195 'prompt':205 'proper':235 'protocol':50 'quot':144 'rate':98,142 'readm':197 'render':200 'report':124 'request':14,30,44,70,161 'request/response':216 'respons':184 'retriev':176 'return':233,243 'schema':217 'sentiment':131 'settl':46 'simpli':104 'spars':191 'spec':214 'specif':58,164 'success':245 'suit':39 'summar':134 'text':133 'though':181 'token':143 'undocu':187 'unit':81 'unknown':248 'upon':244 'usag':221 'usdc':16,32,56,83,87 'usdc-settlement' 'use':55 'util':149 'valid':151 'via':10,26,47 'wallet':204 'web3':138 'x402':11,27,49,73,107,237 'x402 API access' 'x402-payment'","prices":[{"id":"d3c63833-3f9c-4b91-9af2-f1692c015a8f","listingId":"75c3978b-56e9-4cd7-b9d6-9cfcae9294e1","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/apikeys/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:29.016Z"}],"sources":[{"listingId":"75c3978b-56e9-4cd7-b9d6-9cfcae9294e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:29.016Z","lastSeenAt":"2026-04-23T08:02:07.684Z"}],"details":{"listingId":"75c3978b-56e9-4cd7-b9d6-9cfcae9294e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/4 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/4"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/4"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring a premium API key for accessing lowpaymentfee.com services","Agent-driven programmatic access to paid API endpoints without traditional auth","One-shot micropayment API calls settled on Base L2"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native (USDC on Base) billing over traditional subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume users who need bulk pricing or enterprise agreements"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.166Z"},"updatedAt":"2026-04-23T08:02:07.684Z"}}