{"id":"664334ea-457f-4fb0-bb46-8fee8bd35235","shortId":"q5DrUS","kind":"x402","title":"Premium API access endpoint on Base via x402, paying per-request in USDC.","tagline":"Premium API access endpoint on Base via x402, paying per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at `/api/v1/apikeys/23`, payable per-request via the x402 protocol on the Base network using USDC. The x402 challenge is live and returns a 402 with an exact-scheme payment requirement of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs across several 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 listed at $0.02 per request with no API keys, no rate limits, and instant access.\n\nHowever, this specific endpoint (`/api/v1/apikeys/23`) is described only as \"Premium API Access\" with no further documentation on what it returns or what input it expects. The docs, pricing, and README pages on the site are gated behind a wallet connection and yield no additional content. Without schema details or example responses, the exact functionality of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","api-key-generation"],"categories":["infrastructure","api-access"],"synonyms":["premium API key","x402 API access","pay-per-request API","USDC API payment","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, and README pages are gated behind wallet connection and provide no content","The exact functionality and response format of /api/v1/apikeys/23 is undocumented","The endpoint path suggests API key generation but this is inferred, not confirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/23","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented input/output format, no example responses, and the docs pages are empty (wallet-gated). The specific purpose of the /api/v1/apikeys/23 endpoint beyond 'Premium API Access' is unknown.","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":"2026-04-19T15:19:55.678Z","embedding":[-0.0009212494,-0.03656006,0.049987793,0.011940002,0.035614014,-0.028442383,-0.035369873,0.060821533,0.05871582,-0.06939697,0.028259277,-0.035736084,-0.04525757,-0.046142578,-0.022705078,0.010917664,-0.009422302,0.009170532,-0.061676025,0.033233643,0.04373169,-0.030517578,-0.0064430237,0.041625977,0.0056266785,-0.016525269,-0.010040283,-0.007774353,-0.0010824203,-0.03277588,0.027297974,-0.021743774,-0.009391785,0.01991272,-0.015068054,-0.01576233,0.0024929047,0.050994873,0.026168823,-0.010986328,-0.011184692,-0.06628418,0.0038337708,0.0060691833,-0.035217285,0.019363403,-0.00073957443,-0.027008057,-0.021560669,-0.0032138824,-0.029510498,0.0033607483,-0.01525116,-0.019989014,0.011306763,0.012908936,-0.01751709,-0.019485474,0.000995636,0.009994507,0.017593384,-0.050842285,-0.01776123,0.009048462,0.006454468,0.05697632,-0.0079422,0.04763794,0.010131836,0.05343628,0.05517578,0.062042236,0.038879395,0.015930176,0.00868988,-0.0035552979,-0.001958847,0.05480957,-0.018875122,-0.0067863464,-0.02432251,-0.0035381317,-0.03829956,-0.0012493134,-0.010154724,-0.054595947,-0.025741577,0.0058403015,-0.010574341,0.005859375,-0.06933594,-0.01436615,-0.010314941,0.012626648,0.009963989,-0.006500244,-0.02067566,0.0209198,-0.018539429,0.028198242,0.02243042,-0.032806396,0.016616821,0.022644043,0.0473938,0.04336548,0.008644104,0.032348633,0.0067863464,-0.023925781,-0.0236969,0.0044021606,-0.018676758,-0.030212402,0.0024719238,0.015312195,-0.032226562,0.0101623535,-0.007293701,0.022918701,-0.055419922,0.044036865,0.036590576,-0.019927979,0.011016846,-0.044830322,-0.006919861,0.020935059,-0.017242432,-0.020706177,0.034210205,0.005607605,0.01878357,-0.0032482147,-0.03173828,0.013931274,-0.009887695,-0.033355713,-0.045715332,-0.033203125,0.02545166,-0.018112183,0.040649414,0.03302002,-0.101623535,-0.0027580261,-0.057128906,0.005466461,-0.03945923,-0.008201599,-0.010154724,0.005218506,-0.019058228,-0.0011396408,-0.013687134,-0.016189575,-0.0015258789,0.02822876,-0.0019683838,0.05105591,-0.0024433136,0.047088623,0.022949219,0.01499939,0.040161133,0.02961731,0.003194809,-0.07562256,-0.08099365,-0.02935791,-0.023101807,-0.008216858,-0.039855957,0.017669678,0.0004682541,-0.07897949,-0.02243042,-0.005783081,0.0018444061,-0.04071045,-0.0063819885,-0.018325806,0.0017843246,0.0031204224,-0.04663086,-0.0063095093,-0.028701782,0.07019043,0.016845703,0.0073623657,0.032928467,-0.0065574646,0.053100586,0.0053596497,-0.018234253,-0.041046143,0.0020065308,-0.012069702,0.03302002,0.0075569153,0.00034570694,-0.04156494,0.03515625,0.05807495,0.03277588,0.0053138733,0.0099105835,-0.05606079,-0.022903442,-0.041656494,-0.0070381165,0.016326904,0.009765625,0.040161133,-0.047027588,-0.025253296,-0.014480591,0.0037345886,0.016479492,0.064086914,-0.009902954,-0.015975952,0.008659363,0.031311035,-0.033843994,0.0345459,0.024108887,0.013595581,-0.04055786,-0.030288696,0.01676941,0.041290283,-0.025039673,-0.0048942566,-0.029067993,0.025009155,-0.0074691772,-0.00042033195,0.035949707,-0.009963989,-0.02293396,-0.048034668,-0.020431519,0.036987305,-0.010017395,-0.020599365,-0.041412354,-0.06304932,0.03149414,0.047546387,0.041381836,-0.011306763,0.01725769,-0.02519226,-0.0039024353,-0.05960083,0.053131104,0.07543945,-0.011428833,-0.017807007,0.009178162,-0.011360168,-0.03378296,-0.009773254,0.0068092346,-0.034057617,-0.021652222,0.01322937,-0.03918457,0.019989014,0.018585205,0.032318115,0.053955078,-0.0078048706,-0.027053833,-0.03491211,0.013008118,0.0008134842,-0.036834717,-0.012672424,0.006549835,-0.0053215027,0.05026245,-0.018234253,0.024902344,0.008079529,0.016860962,-0.0028457642,-0.029006958,-0.028915405,-0.0149383545,0.018569946,0.010360718,-0.058380127,0.024139404,-0.0072021484,0.06665039,-0.04638672,0.042419434,-0.0015745163,0.027114868,0.036315918,-0.01612854,-0.047821045,0.005306244,0.025939941,0.025985718,0.03869629,0.010574341,-0.008232117,0.007045746,0.05697632,-0.02784729,-0.014945984,-0.0038795471,0.014099121,0.025100708,-0.019073486,-0.05871582,-0.031982422,-0.029693604,-0.043304443,0.018417358,-0.04034424,0.03970337,-0.008041382,-0.0010089874,-0.018356323,-0.0034770966,-0.03668213,0.03781128,-0.033996582,0.003768921,-0.019897461,-0.024520874,0.009307861,0.037872314,-0.007194519,0.0051078796,0.032958984,0.02670288,-0.013130188,-0.03717041,-0.013427734,-0.0079193115,0.008636475,0.027420044,0.0044670105,0.018310547,0.04031372,-0.04147339,0.025939941,0.032226562,0.00080394745,0.03302002,-0.013519287,0.020309448,-0.06591797,-0.062194824,-0.028182983,-0.04006958,0.030029297,0.0075569153,0.0007381439,0.029632568,-0.010658264,-0.008811951,-0.034484863,0.028549194,-0.03704834,0.0073890686,0.044891357,-0.0012674332,-0.030471802,-0.001537323,0.017959595,0.007461548,0.035003662,0.001162529,0.02784729,0.07269287,0.052337646,-0.0071411133,0.0079956055,0.027709961,0.023117065,-0.004802704,-0.026901245,-0.028259277,0.007858276,0.013748169,-0.020233154,-0.018096924,-0.06842041,0.058898926,0.041107178,0.07128906,0.024337769,0.023345947,0.042938232,-0.019134521,0.007331848,-0.008132935,-0.0054397583,-0.013687134,-0.024932861,0.02796936,-0.018478394,-0.00598526,-0.020751953,0.032165527,-0.00092840195,0.007972717,-0.04446411,0.058807373,0.010032654,-0.0029716492,0.012161255,-0.00042200089,0.036834717,0.038909912,-0.04714966,0.018753052,0.019729614,-0.02142334,-0.004360199,0.04751587,0.0026226044,-0.03326416,-0.06866455,-0.024536133,-0.0015134811,-0.00617218,-0.05316162,-0.0054969788,0.014816284,0.0032844543,0.02116394,-0.030410767,-0.026901245,0.0050239563,-0.023925781,-0.060424805,0.0011577606,-0.053771973,0.013618469,0.04019165,-0.020263672,-0.01852417,0.012664795,-0.00059461594,-0.002576828,0.010475159,0.0024433136,0.004573822,-0.045562744,0.020065308,0.012245178,0.019851685,0.014678955,0.026855469,0.0234375,0.012878418,0.047943115,0.021881104,-0.034332275,-0.046295166,0.024795532,-0.056671143,-0.00957489,-0.003528595,-0.007194519,-0.009094238,0.0012254715,-0.018585205,-0.030471802,0.014678955,-0.044708252,0.029373169,0.048553467,-0.047546387,-0.02003479,-0.066589355,-0.01889038,-0.012168884,0.07128906,0.0418396,0.0043029785,-0.05960083,-0.016571045,0.021194458,-0.00059747696,0.023345947,-0.014404297,-0.012062073,-0.016464233,-0.030258179,-0.0206604,-0.02192688,0.023254395,0.015129089,-0.02659607,0.026351929,0.005142212,0.0031852722,0.005065918,0.009437561,0.02734375,-0.033843994,-0.0000019073486,-0.016677856,0.02229309,-0.00466156,-0.015312195,-0.045135498,0.055267334,0.005836487,0.02633667,-0.032684326,0.0065231323,0.0012159348,0.014320374,0.009841919,-0.006500244,-0.0049552917,0.0022449493,-0.05645752,-0.06536865,0.027236938,-0.01574707,0.030410767,-0.0035324097,0.007896423,0.027374268,0.003616333,0.005683899,0.035003662,-0.019638062,-0.008262634,-0.033325195,-0.02796936,-0.005645752,0.02268982,-0.018493652,0.010345459,-0.0073776245,0.011199951,-0.003917694,-0.0284729,0.035858154,0.011009216,-0.0025482178,0.023208618,0.006652832,0.017166138,0.049743652,0.012359619,-0.03591919,0.012420654,0.004146576,-0.001996994,-0.0016975403,0.036621094,0.028335571,-0.0289917,0.0011062622,0.0016040802,-0.010131836,-0.018356323,-0.0050582886,0.008766174,0.026779175,-0.0014371872,-0.043395996,0.030136108,0.03363037,-0.012641907,-0.008071899,0.020767212,0.028549194,-0.024490356,0.02822876,0.02444458,0.06274414,-0.013931274,-0.005115509,0.009231567,0.0289917,0.005771637,0.015296936,-0.026641846,0.013870239,-0.019424438,0.005027771,-0.0051841736,0.0018167496,0.016113281,-0.010391235,0.015205383,0.025253296,0.008895874,-0.022201538,-0.032409668,0.0037994385,-0.0031967163,0.0036888123,0.013092041,0.025253296,0.012863159,-0.01965332,0.008743286,0.013908386,-0.038391113,-0.021118164,-0.012886047,0.04458618,-0.016921997,-0.005168915,0.0033092499,0.0056877136,0.016830444,-0.053497314,-0.0025501251,0.00868988,0.017120361,-0.02243042,-0.04864502,-0.037994385,-0.009178162,0.041229248,0.005706787,0.01348114,0.033447266,0.008338928,-0.0022258759,0.03982544,0.007232666,-0.0068511963,-0.012840271,-0.0423584,-0.004146576,0.012756348,-0.0066108704,-0.018966675,0.008560181,-0.017288208,-0.030883789,0.0048828125,-0.0071029663,-0.0126571655,-0.00007593632,0.013671875,0.03640747,0.011878967,0.017700195,-0.0066986084,-0.02067566,0.022003174,0.0045661926,0.0072135925,-0.036621094,0.023590088,-0.0181427,-0.0096206665,-0.012397766,0.008666992,0.022216797,0.024459839,-0.0005607605,0.03982544,-0.041870117,0.033325195,-0.045562744,0.011566162,-0.007835388,-0.04147339,0.0041389465,-0.03564453,-0.025039673,0.038116455,-0.019546509,-0.005596161,-0.03149414,-0.021133423,-0.0085372925,-0.044555664,0.024932861,0.02645874,0.040100098,-0.024459839,0.0047721863,-0.0014762878,-0.0041046143,-0.014465332,0.00315094,-0.013450623,0.022994995,0.019989014,0.003168106,-0.028411865,-0.030853271,-0.007396698,-0.021865845,-0.040649414,-0.044921875,-0.016540527,0.01713562,0.0016069412,0.005897522,-0.031677246,-0.028182983,-0.0028629303,-0.040527344,0.017303467,0.0025253296,0.0126953125,0.012466431,-0.013946533,0.0037593842,0.036468506,-0.023422241,0.031341553,0.0054626465,0.00484848,-0.032287598,0.0032978058,0.048095703,0.02519226,0.004211426,-0.0056991577,-0.010131836,-0.016723633,-0.04800415,-0.013618469,0.007247925,-0.021118164,0.012123108,-0.00064992905,-0.048675537,-0.016815186,-0.020584106,-0.008880615,0.021591187,0.038085938,0.012382507,-0.0018014908,-0.0061836243,0.0015745163,-0.0033607483,-0.039276123,0.023895264,0.010635376,0.0025196075,0.009033203,0.04360962,0.008743286,-0.0056533813,0.014587402,-0.0016288757,0.013725281,-0.012626648,0.008758545,-0.018096924,0.012916565,0.00026726723,-0.021484375,-0.036956787,-0.005378723,0.08166504,-0.0049209595,-0.011703491,0.004081726,-0.009643555,0.020614624,0.026779175,-0.06365967,-0.008934021,-0.018234253,0.008201599,-0.0015525818,0.031097412,0.0028572083,-0.0035057068,-0.019012451,-0.048828125,-0.012069702,0.010215759,-0.018539429,-0.05886841,-0.017303467,-0.03250122,-0.017349243,0.0032348633,-0.017425537,0.0012598038,0.008583069,-0.013572693,-0.07800293,0.006462097,0.04473877,0.01638794,0.020126343,-0.02659607,0.006011963,0.01348114,-0.025558472,-0.031311035,0.0362854,-0.03466797,-0.01751709,-0.026931763,0.031433105,-0.023849487,-0.030807495,0.034210205,0.005508423,0.04147339,-0.015182495,0.0127334595,-0.016418457,0.0033817291,-0.015205383,0.01651001,-0.009735107,-0.010215759,0.018936157,-0.044036865,0.023788452,0.014961243,0.008277893,-0.005378723,0.030471802,0.024414062,-0.0385437,-0.004928589,0.04373169,-0.0051612854,0.041748047,-0.036193848,0.05078125,0.01260376,-0.008041382,0.02545166,-0.009246826,-0.02458191,-0.055358887,-0.016708374,0.018035889,0.013320923,0.015838623,-0.023406982,0.0040779114,0.035339355,-0.00894165,0.006916046,-0.032562256,-0.014816284,-0.0107803345,0.005504608,-0.008285522,-0.0031719208,-0.00068187714,0.029144287,0.019760132,0.040618896,0.008407593,-0.014572144,0.026779175,0.008293152,-0.014846802,-0.00258255,0.013946533,0.010696411,0.02116394,0.015274048,0.0025177002,-0.04421997,-0.0062561035,-0.026443481,-0.00040626526,0.0029182434,-0.005191803,-0.00894165,-0.006263733,-0.0006532669,0.011833191,-0.039764404,0.027297974,-0.04562378,-0.031463623,-0.008003235,-0.012908936,0.0056915283,0.010749817,0.020248413,0.025405884,-0.005760193,0.057647705,0.013465881,0.0027542114,0.021118164,0.029083252,0.017410278,-0.01940918,-0.008117676,-0.0018844604,0.014480591,-0.00031375885,-0.030136108,0.020721436,0.04043579,-0.011878967,0.020080566,-0.0012817383,0.023773193,-0.018066406,0.015731812,-0.010658264,0.022155762,-0.028076172,0.03466797,-0.03488159,0.011268616,0.020828247,0.009338379,0.0085372925,-0.024032593,-0.038238525,0.006324768,0.0034160614,-0.031433105,0.051208496,-0.007709503,0.026977539,-0.0289917,-0.017120361,0.010032654,-0.029067993,-0.014465332,0.04446411,-0.0055351257,-0.002664566,0.026855469,-0.02670288,0.040924072,-0.031463623,0.011505127,0.012641907,-0.0045204163,-0.02885437,-0.002494812,-0.027526855,-0.0014209747,-0.0018262863,-0.0079422,-0.008995056,0.045318604,0.032165527,0.026367188,0.038024902,0.0053596497,0.01751709,-0.040130615,-0.02041626,0.004119873,-0.022521973,0.018753052,-0.014755249,0.0362854,0.03994751,-0.005329132,0.03253174,0.036743164,0.008804321,0.0054359436,0.008628845,-0.009429932,0.021850586,-0.012313843,0.032226562,0.006340027,0.02532959,-0.03152466,0.012939453,0.0020961761,0.024642944,-0.039245605,0.04107666,0.072265625,0.016448975,-0.0104904175,0.024475098,-0.001789093,-0.013031006,-0.021881104,-0.022872925,0.057922363,0.019470215,0.044799805,0.038146973,0.008155823,-0.01171875,0.016952515,-0.026245117,-0.030288696,0.062683105,0.021652222,-0.032287598,-0.014350891,-0.0155181885,0.00041556358,-0.05001831,-0.03050232,0.014556885,-0.00021898746,0.008369446,-0.008407593,-0.001077652,-0.013084412,0.027450562,0.010688782,0.013633728,-0.016906738,0.04949951,0.022262573,0.020080566,0.012954712,-0.011108398,0.036743164,-0.039276123,-0.010269165,0.00881958,0.014595032,-0.004470825,-0.011177063,0.017929077,0.004348755,0.059051514,0.040863037,-0.017227173,0.0015687943,0.031066895,0.013023376,0.0062408447,0.05050659,0.024841309,0.006389618,0.030395508,0.040649414,0.013908386,-0.032562256,0.0069465637,-0.0055618286,-0.0015096664,-0.006511688,-0.017684937,-0.0036525726,-0.0112838745,0.013450623,0.0011339188,-0.008407593,0.027679443,0.03137207,0.0012273788,0.0035591125,-0.012275696,0.013130188,-0.008781433,0.0014133453,0.021194458,-0.008125305,0.019882202,0.019546509,0.02784729,-0.034088135,0.0287323,-0.008132935,-0.01210022,-0.014633179,0.023727417,-0.0473938,-0.0073165894,-0.00491333,0.0003607273,-0.035858154,0.015037537,0.025283813,-0.014572144,0.034454346,0.0149002075,-0.006500244,-0.009262085,0.012458801,0.008140564,-0.010040283,-0.021636963,-0.023345947,0.013320923,0.030075073,0.0036067963,0.024673462,-0.01939392,-0.0029125214,0.0026378632,-0.003206253,0.0009994507,-0.0059394836,-0.016296387,-0.032958984,0.009376526,0.0463562,0.016830444,0.0289917,0.0034179688,-0.01689148,0.009498596,0.018493652,0.016021729,-0.0011777878,-0.017410278,0.029174805,0.007232666,0.047790527,0.04547119,0.0057907104,0.012901306,-0.021469116,-0.009941101,-0.0010461807,-0.02017212,0.018829346,-0.016723633,0.006454468,-0.010978699,0.021697998,-0.019378662,-0.03262329,0.009277344,-0.01876831,-0.00044202805,-0.029586792,-0.0054626465,0.013015747,0.017700195,0.045532227,0.01737976,-0.02407837,0.064331055,-0.022598267,0.048217773,-0.011352539,-0.0034313202,0.033935547,0.031219482,0.033721924,0.011146545,0.021499634,-0.021820068,0.014724731,0.056365967,0.025039673,0.007358551,0.012290955,-0.033050537,0.031402588,0.00774765,0.03161621,-0.009841919,-0.0073509216,0.007896423,-0.00806427,-0.015510559,0.0063705444,-0.0084991455,0.018539429,0.03945923,-0.04058838,-0.019210815,-0.009094238,-0.018234253,0.028823853,-0.0013170242,0.01499939,-0.011062622,-0.025283813,0.020263672,-0.026779175,-0.010215759,-0.0044021606,0.0287323,-0.04171753,-0.020492554,0.001376152,0.020462036,-0.025894165,0.015365601,0.031829834,-0.010726929,0.010574341,0.048706055,-0.0018520355,0.053222656,-0.0046157837,0.024246216,0.048736572,-0.006011963,-0.025421143,0.018478394,0.018188477,-0.023529053,0.0024108887,0.049835205,-0.0036029816,0.0104904175,0.009605408,-0.01637268,0.0051078796,0.0044136047,0.000011503696,-0.013877869,-0.008995056,0.010353088,-0.008323669,0.01701355,-0.000017642975,-0.011581421,-0.005493164,-0.017410278,0.006843567,0.022842407,0.007785797,-0.038513184,-0.0013437271,0.011009216,0.020996094,-0.016815186,-0.020736694,-0.025131226,-0.03781128,0.023971558,0.025115967,0.0028953552,-0.0024757385,-0.024459839,0.00497818,0.03253174,0.014984131,0.0048179626,0.006477356,-0.011230469,0.014076233,-0.01902771,-0.0069465637,-0.014541626,-0.006374359,0.0074882507,0.025650024,-0.0008673668,-0.031341553,0.024169922,-0.0056915283,0.016815186,0.01651001,-0.014350891,0.023223877,-0.014411926,-0.010658264,-0.0047798157,0.012382507,-0.019500732,-0.025909424,-0.031143188,0.02078247,0.04559326,-0.013336182,-0.021530151,0.011413574,0.014923096,0.022460938,0.031036377,0.008338928,0.045074463,0.027496338,-0.0093688965,-0.011459351,0.008140564,-0.015556335,-0.026184082,0.0057373047,0.00042128563,-0.028549194,0.031066895,0.0016994476,-0.015312195,-0.02407837,-0.022094727,0.0010671616,-0.01285553,0.021224976,-0.012290955,0.01234436,-0.021102905,-0.0037021637,-0.0010986328,-0.00084638596,-0.028671265,-0.027450562,0.0029964447,-0.005443573,-0.060791016,0.005580902,-0.038208008,0.012199402,-0.024795532,-0.015106201,0.002298355,0.030853271,-0.0107421875,0.010231018,0.0132751465,0.026748657,0.004009247,0.021759033,0.023880005,-0.008666992,-0.032836914,-0.019226074,-0.0016946793,-0.024414062,0.026626587,-0.0018730164,0.029922485,0.010917664,-0.0004451275,-0.012908936,-0.0054359436,-0.009384155,-0.004184723,-0.030258179,-0.017120361,0.017608643,0.021881104,-0.004623413,-0.011817932,0.052093506,-0.021255493,-0.015159607,0.025878906,0.055999756,0.0005440712,0.037506104,-0.018325806,-0.014595032,-0.014373779,-0.00029873848,-0.026519775,0.010772705,0.012123108,0.01020813,-0.0030384064,-0.013053894,0.011917114,-0.020050049,0.0025482178,0.019622803,0.0030174255,-0.024414062,0.025604248,0.013061523,0.0054740906,-0.020401001,-0.016296387,0.030227661,0.03842163,0.015312195,-0.00013971329,0.0079574585,0.002532959,-0.013221741,0.008407593,0.015586853,-0.015556335,-0.027053833,-0.02027893,-0.027038574,0.021774292,0.024429321,0.030471802,0.00919342,0.01776123,-0.015930176,-0.02268982,-0.016815186,0.025939941,0.007904053,-0.018203735,-0.009811401,-0.001332283,0.024246216,-0.02027893,0.003648758,-0.041778564,-0.021820068,-0.006652832,-0.018707275,0.02255249,0.011833191,-0.004852295,0.0022068024,-0.009750366,0.0019836426,0.00070381165,0.031555176,-0.014129639,-0.0011014938,-0.001745224,0.011260986,-0.015235901,0.016281128,-0.00166893,-0.0058784485,0.019439697,-0.01007843,0.016357422,-0.0126953125,0.02722168,0.0023002625,-0.010009766,0.040161133,0.0045700073,0.013648987,-0.03111267,-0.00019538403,0.0049552917,0.007701874,0.025817871,-0.022125244,-0.020263672,0.0134887695,-0.029876709,-0.04449463,-0.0015144348,0.03945923,0.032196045,-0.019638062,0.033447266,-0.014556885,-0.0009236336,0.010665894,0.0075798035,-0.017547607,-0.012382507,0.056671143,-0.0000808835,-0.0022010803,0.0031147003,-0.009864807,-0.017715454,-0.025253296,0.009742737,-0.009269714,-0.00920105,0.014595032,0.0016784668,0.03363037,0.002111435,0.016647339,0.02319336,0.0146865845,0.017608643,0.012771606,0.04534912,-0.005493164,-0.023666382,0.005794525,0.0146865845,-0.014076233,-0.012626648,0.00077342987,0.002374649,-0.039794922,0.02935791,-0.0065345764,0.03842163,-0.02519226,0.0071411133,-0.028747559,-0.01737976,-0.024765015,-0.014976501,-0.036468506,0.014480591,0.04736328,0.013702393,0.0016813278,0.0059013367,-0.023651123,0.04260254,0.05709839,-0.003227234,-0.030227661,-0.019378662,0.0072784424,0.0020828247,-0.004535675,0.020507812,-0.018081665,-0.012397766,0.012382507,-0.017501831,0.00762558,0.0010166168,0.0059547424,0.0029029846,-0.01776123,-0.006298065,0.01977539,-0.00082063675,-0.0053482056,-0.0015497208,0.003578186,0.039978027,0.020690918,-0.006389618,0.019973755,0.024658203,-0.022109985,0.040527344,-0.029876709,0.014389038,-0.021011353,-0.0011615753,-0.039123535,-0.011833191,-0.0019741058,0.002773285],"createdAt":"2026-04-18T19:29:25.903Z","updatedAt":"2026-04-23T08:02:07.529Z","lastSeenAt":"2026-04-23T08:02:07.529Z","tsv":"'/api/v1/apikeys/23':40,166 '0.02':78,149 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':92 '20':72 '300':97 '402':63 '6':85 'Base network API' 'USDC API payment' 'access':3,17,37,161,173 'across':108 'addit':205 'address':91 'advertis':103 'ai':118 'analysi':122 'analyt':112 'api':2,16,36,107,154,172 'api-key-generation' 'base':6,20,51,74 'base-network' 'behind':198 'broader':100 'categori':110 'challeng':57 'classif':125 'connect':201 'content':206 'convers':142 'data':111,115 'decim':86 'describ':168 'detail':209 'doc':188 'document':177 'embed':126 'endpoint':4,18,30,145,165,219 'estim':136 'exact':67,214 'exact-schem':66 'exampl':211 'exchang':131 'expect':186 'export':116 'feed':130 'financ':127 'function':215 'gas':135 'gate':197 'generat':143 'geocod':140 'howev':162 'infrastructur':138 'input':184 'insight':117 'instant':160 'key':155 'learn':120 'limit':158 'list':147 'live':59 'lowpaymentfee' 'lowpaymentfee.com':32,101 'machin':119 'metric':113 'network':52 'page':192 'particular':218 'pay':9,23 'pay-per-request API' 'payabl':41 'payment':69,87 'per':11,25,43,80,150 'per-request':10,24,42 'per-request-pricing' 'platform':102 'premium':1,15,35,171 'premium API key' 'price':129,189 'protocol':48 'provid':33 'quot':134 'rate':132,157 'readm':191 'remain':220 'report':114 'request':12,26,44,81,151 'requir':70 'resourc':38 'respons':212 'return':61,181 'schema':208 'scheme':68 'second':98 'sent':89 'sentiment':121 'sever':109 'sinc':82 'site':195 'specif':164 'suit':105 'summar':124 'text':123 'timeout':95 'token':133 'unclear':221 'unit':75 'usd':79 'usdc':14,28,54,77,83 'usdc-settlement' 'use':53,84 'util':139 'valid':141 'via':7,21,45 'wallet':200 'web3':128 'without':207 'x402':8,22,47,56 'x402 API access' 'x402-payment' 'yield':203","prices":[{"id":"e13d6c8e-ea38-4be4-a1e1-36c73ac0e4ab","listingId":"664334ea-457f-4fb0-bb46-8fee8bd35235","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:25.903Z"}],"sources":[{"listingId":"664334ea-457f-4fb0-bb46-8fee8bd35235","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:25.903Z","lastSeenAt":"2026-04-23T08:02:07.529Z"}],"details":{"listingId":"664334ea-457f-4fb0-bb46-8fee8bd35235","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/23 \\\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":"The x402 challenge returns a 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/23"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/23"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Purchasing premium API access or API keys via a single micropayment","Programmatic agent-driven acquisition of API credentials","Pay-per-use access to platform services without pre-registration"],"bestFor":["Agents or scripts that need instant, keyless API access via crypto payment","Developers who want to avoid subscription commitments and pay per call","Web3-native applications settling on Base L2"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.322Z"},"updatedAt":"2026-04-23T08:02:07.529Z"}}