{"id":"b1211e33-0d27-4c64-8e9b-d152b897c5bb","shortId":"xFJFHX","kind":"x402","title":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/3` accepts POST requests and returns JSON. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys required, no rate limits, and instant access.\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. The exact functionality behind the \"Premium API Access\" label at this particular path (`/apikeys/3`) is unclear; it may provision or return an API key, but this is not documented. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base","micropayment","pay-per-request","json-api","post-method"],"categories":["infrastructure","api-access"],"synonyms":["premium api access","api key generation","x402 api","lowpaymentfee","micropayment api","base usdc api","pay-per-call api"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The exact functionality of /api/v1/apikeys/3 ('Premium API Access') is not documented — it is unclear what this endpoint returns","No request body schema or response schema is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/3","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation, no request/response schema, and no examples. The exact purpose of the /apikeys/3 path is undocumented. This is effectively a stub listing.","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":"2026-04-19T15:16:13.858Z","embedding":[-0.01474762,-0.025680542,0.046081543,0.012229919,0.023880005,-0.042175293,-0.01977539,0.050628662,0.056121826,-0.06463623,0.027832031,-0.043395996,-0.055389404,-0.023406982,-0.042633057,-0.002872467,-0.023635864,0.0011529922,-0.058532715,0.032806396,0.043701172,-0.034332275,0.010658264,0.060913086,0.004638672,-0.010902405,-0.0010204315,-0.015457153,-0.009063721,-0.02609253,0.031402588,-0.024337769,-0.019866943,0.031051636,-0.0234375,-0.0052719116,0.0027198792,0.0309906,0.030273438,-0.0024204254,-0.005870819,-0.05987549,0.008361816,0.010826111,-0.02218628,0.0018644333,-0.00223732,-0.029708862,-0.026763916,0.0031356812,-0.025283813,0.002275467,-0.01789856,-0.0025119781,0.0082092285,0.01109314,-0.016403198,-0.030578613,-0.0013999939,0.011482239,0.013923645,-0.05203247,0.000056028366,0.012817383,0.01576233,0.050750732,-0.013877869,0.04888916,0.012763977,0.057617188,0.031799316,0.052703857,0.021881104,0.022003174,-0.012176514,0.004299164,-0.014427185,0.052215576,0.0038166046,-0.008468628,-0.020690918,-0.0017518997,-0.0501709,-0.021347046,-0.021835327,-0.06994629,-0.019332886,0.0067329407,-0.019042969,0.02645874,-0.07220459,-0.026489258,-0.013015747,0.026535034,-0.0014371872,0.016616821,-0.02520752,0.017593384,-0.010894775,0.01689148,0.020568848,-0.04119873,0.020050049,0.0135269165,0.052215576,0.039886475,0.0093307495,0.025161743,0.007858276,-0.031051636,-0.030685425,-0.001241684,-0.012916565,-0.015151978,0.023864746,-0.005466461,-0.008514404,0.009666443,-0.016662598,0.004360199,-0.05041504,0.057922363,0.03955078,-0.023498535,0.016143799,-0.05859375,0.0006766319,0.004173279,-0.033599854,-0.0075302124,0.030578613,0.012313843,0.035003662,-0.0059509277,-0.030197144,0.0069122314,-0.002418518,-0.030349731,-0.04849243,0.0038547516,0.029907227,-0.028213501,0.031143188,0.029144287,-0.105651855,-0.015342712,-0.053131104,0.011367798,-0.03353882,-0.008094788,0.012863159,0.010292053,-0.0013389587,-0.016189575,-0.00055503845,-0.015304565,-0.008117676,0.02734375,0.00096702576,0.043640137,-0.006996155,0.04849243,0.022247314,0.015960693,0.022277832,0.049957275,0.013549805,-0.06463623,-0.077819824,-0.03302002,-0.020767212,-0.019607544,-0.03237915,0.007888794,-0.007858276,-0.08416748,-0.029907227,-0.0115737915,-0.009933472,-0.040222168,-0.017501831,-0.021362305,0.00083971024,-0.010513306,-0.059783936,0.0029563904,-0.023956299,0.049041748,0.0032444,-0.0048980713,0.032470703,-0.010818481,0.041625977,0.008766174,-0.015655518,-0.0423584,0.015945435,-0.028137207,0.049743652,0.021255493,-0.0010919571,-0.02960205,0.026672363,0.046966553,0.032684326,-0.024307251,0.01727295,-0.047546387,-0.032043457,-0.027282715,-0.0012798309,0.005306244,0.007820129,0.020248413,-0.033233643,-0.0053482056,0.0036010742,0.0049209595,0.018661499,0.072631836,-0.016143799,-0.011230469,0.014160156,0.028167725,-0.036071777,0.04168701,0.03186035,0.02420044,-0.020980835,-0.015701294,0.022659302,0.037902832,-0.024429321,-0.008079529,-0.03353882,0.023986816,0.0048828125,0.0022850037,0.027435303,-0.013809204,-0.009048462,-0.039215088,-0.017303467,0.035247803,-0.004699707,-0.028625488,-0.05911255,-0.062194824,0.032989502,0.044830322,0.03201294,-0.012084961,0.0029239655,-0.009750366,-0.0033454895,-0.05307007,0.048095703,0.07989502,-0.019821167,-0.02406311,0.025650024,-0.020980835,-0.026382446,-0.027923584,-0.0075035095,-0.024887085,-0.024597168,0.029296875,-0.039489746,0.0018386841,0.017501831,0.02230835,0.0602417,-0.012275696,-0.022155762,-0.025604248,0.006324768,0.00013720989,-0.052886963,-0.014183044,0.016647339,0.013587952,0.04534912,-0.02104187,0.027618408,-0.0038814545,0.009353638,-0.008781433,-0.02406311,-0.02671814,-0.018661499,0.031677246,0.009109497,-0.049591064,0.022338867,0.0040359497,0.024719238,-0.046020508,0.025115967,-0.012519836,0.009567261,0.04269409,-0.013038635,-0.051452637,-0.01007843,0.019317627,0.046295166,0.04034424,0.017150879,0.005393982,0.0007472038,0.07244873,-0.02217102,-0.010520935,0.0051345825,0.02784729,0.030548096,-0.010093689,-0.06286621,-0.03060913,-0.025970459,-0.023406982,0.021392822,-0.042053223,0.031921387,-0.012748718,0.005191803,-0.016983032,0.0055007935,-0.033203125,0.037506104,-0.030059814,0.008544922,-0.025436401,-0.02708435,-0.005207062,0.036590576,-0.010169983,-0.0001103878,0.043884277,0.009841919,-0.005054474,-0.023132324,-0.0019798279,-0.025817871,0.010177612,0.033416748,0.012992859,0.015914917,0.030685425,-0.021087646,0.017471313,0.020767212,-0.0066871643,0.03982544,-0.00869751,0.005519867,-0.047058105,-0.051940918,-0.01461792,-0.022491455,0.033416748,-0.01084137,-0.0019741058,0.034729004,-0.009918213,-0.015060425,-0.06262207,0.024383545,-0.022415161,-0.0013666153,0.033447266,-0.017364502,-0.048034668,0.009338379,0.015266418,0.017410278,0.034118652,0.021438599,-0.0014829636,0.063964844,0.033081055,0.012809753,0.01789856,0.010185242,0.013298035,-0.016204834,-0.028625488,-0.026794434,0.010276794,0.01600647,-0.01725769,-0.01576233,-0.07104492,0.073913574,0.03475952,0.073913574,0.012321472,0.013748169,0.05633545,-0.020523071,0.017562866,-0.018051147,-0.008460999,-0.021697998,-0.054351807,0.021591187,-0.0026950836,-0.0023345947,-0.041046143,0.038238525,0.018661499,0.0073051453,-0.061828613,0.06921387,0.013145447,-0.0032520294,0.0072669983,0.008201599,0.04522705,0.041748047,-0.045532227,0.0002937317,0.015548706,-0.01725769,0.00018441677,0.036956787,-0.010307312,-0.018615723,-0.070251465,-0.038360596,-0.0007543564,-0.019927979,-0.06304932,-0.01210022,0.017959595,0.017150879,0.021575928,-0.02998352,-0.04425049,0.0107040405,-0.030273438,-0.05517578,0.014389038,-0.05053711,0.009033203,0.041870117,-0.042114258,-0.020629883,0.014411926,0.0025672913,-0.018951416,0.016067505,0.001156807,0.0038642883,-0.04562378,0.022537231,-0.0021686554,0.0032291412,0.023895264,0.016036987,0.033569336,0.011260986,0.03149414,0.012954712,-0.0146484375,-0.047088623,0.031341553,-0.0541687,0.004032135,0.016738892,-0.03643799,-0.013221741,-0.0019741058,-0.036132812,-0.02810669,0.0057792664,-0.041931152,0.019638062,0.049957275,-0.051483154,-0.0055503845,-0.060455322,-0.018707275,-0.0074005127,0.07409668,0.043701172,-0.0014877319,-0.05432129,-0.016067505,0.012901306,0.0064849854,0.007183075,-0.01423645,-0.007549286,-0.0065307617,-0.015197754,-0.028030396,-0.022140503,0.044555664,-0.0031394958,-0.008590698,0.025848389,0.022232056,-0.0026550293,0.012557983,0.0065956116,0.032470703,-0.01965332,0.0028495789,-0.032318115,0.0011453629,0.0027656555,-0.02041626,-0.044921875,0.051116943,0.0053977966,0.04324341,-0.03527832,-0.00068998337,-0.0023117065,0.03149414,0.014389038,0.0035686493,-0.006793976,0.009887695,-0.05307007,-0.074523926,0.034698486,-0.031066895,0.031219482,0.006904602,0.008163452,0.03994751,-0.01373291,-0.006931305,0.03982544,-0.028625488,-0.016830444,-0.03967285,-0.030792236,-0.0069389343,0.017715454,-0.022460938,0.0028572083,-0.005001068,0.008613586,-0.014656067,-0.024307251,0.029373169,0.014198303,0.0037269592,0.0063705444,-0.0070533752,0.022994995,0.045440674,0.0017499924,-0.023208618,0.03289795,0.013954163,0.002691269,-0.0006341934,0.03414917,0.032989502,-0.021514893,-0.0049819946,0.0029525757,0.0009703636,-0.016464233,-0.025115967,0.020126343,0.036132812,0.0051956177,-0.03555298,0.0154953,0.029159546,-0.03250122,-0.006652832,0.019760132,0.035583496,-0.03164673,0.029785156,0.018539429,0.056121826,-0.013298035,-0.0121154785,0.00092601776,0.024368286,0.016601562,0.00894165,-0.015068054,0.0072669983,-0.017364502,0.0042915344,-0.010757446,0.00472641,0.021881104,-0.009010315,0.0027828217,0.030471802,0.006095886,-0.013114929,-0.035461426,-0.0039596558,-0.018600464,-0.01184845,0.009399414,0.018371582,0.027267456,-0.01864624,0.024551392,0.018005371,-0.032592773,-0.017303467,-0.009788513,0.041137695,-0.006099701,0.0021133423,0.0075950623,0.0016670227,0.021026611,-0.053710938,0.0009889603,0.02142334,0.019577026,-0.026794434,-0.062042236,-0.032226562,-0.0070610046,0.044006348,0.007369995,0.010383606,0.023117065,0.0033302307,-0.010772705,0.01449585,0.0057792664,-0.00078201294,-0.0078125,-0.030807495,-0.008621216,0.0015134811,-0.008308411,-0.02067566,0.015930176,-0.014945984,-0.025268555,0.013641357,-0.017105103,-0.0060768127,-0.0039405823,0.019195557,0.026748657,-0.008354187,0.014839172,-0.019607544,-0.025924683,0.020507812,0.01096344,0.010673523,-0.037963867,0.021209717,-0.01701355,-0.018157959,-0.012557983,0.008468628,0.018432617,0.020721436,-0.011184692,0.029418945,-0.049804688,0.04067993,-0.0541687,-0.00027871132,-0.0037136078,-0.022491455,-0.006713867,-0.029266357,-0.024887085,0.024154663,-0.010276794,0.0007543564,-0.029418945,-0.023025513,-0.0062294006,-0.048736572,0.022842407,0.024414062,0.037628174,-0.037597656,-0.0003812313,0.0040512085,0.0007739067,-0.0060195923,-0.0073928833,-0.0093307495,0.035888672,0.015304565,-0.005004883,-0.032684326,-0.020935059,-0.008171082,-0.018707275,-0.040893555,-0.04711914,-0.0071105957,0.019042969,0.004234314,0.0119018555,-0.03805542,-0.019485474,0.0073623657,-0.03643799,0.011199951,-0.0009717941,0.008163452,0.003414154,-0.0079422,0.012756348,0.043426514,-0.046722412,0.03729248,-0.0020313263,-0.011146545,-0.043823242,-0.0012178421,0.045806885,0.0140686035,0.0021381378,-0.014450073,-0.009269714,-0.030380249,-0.043701172,-0.00957489,-0.003124237,0.0020217896,0.011489868,-0.005252838,-0.05206299,-0.02281189,-0.028579712,-0.009490967,0.029815674,0.03552246,0.015792847,-0.00063943863,0.0024204254,-0.0046806335,-0.0050582886,-0.04611206,0.0036621094,0.010063171,-0.0052757263,0.027313232,0.045898438,0.026947021,-0.0003244877,0.0012159348,-0.0018825531,0.021942139,-0.01638794,0.0044670105,-0.02230835,0.008979797,0.00440979,-0.02015686,-0.018310547,-0.003124237,0.07611084,0.005016327,-0.00011253357,0.0043182373,-0.014785767,0.018463135,0.021438599,-0.065979004,-0.010620117,-0.028930664,0.016403198,-0.017105103,0.019561768,0.0066871643,-0.0024108887,-0.027999878,-0.05807495,-0.003917694,0.014823914,0.005367279,-0.06506348,-0.013191223,-0.034606934,-0.013786316,-0.013320923,-0.011131287,-0.0051498413,-0.007698059,-0.015625,-0.068603516,0.013145447,0.05432129,0.022827148,0.011947632,-0.01574707,0.0045547485,0.018997192,-0.028518677,-0.025543213,0.025894165,-0.025817871,-0.024307251,-0.019577026,0.042877197,-0.031463623,-0.021942139,0.020812988,-0.002532959,0.034606934,-0.0011548996,0.017425537,-0.0013122559,-0.0009794235,-0.0178833,0.0055351257,-0.0038089752,0.0012426376,0.019561768,-0.0418396,0.023391724,0.016204834,0.008331299,0.004295349,0.024307251,0.033325195,-0.04119873,-0.009162903,0.030166626,-0.010948181,0.027435303,-0.032287598,0.04421997,0.008621216,-0.013114929,0.019363403,-0.020874023,-0.02809143,-0.047546387,-0.042022705,0.023803711,0.020187378,0.018096924,-0.007522583,-0.00051164627,0.027496338,-0.00036382675,0.011329651,-0.022079468,-0.010871887,-0.021087646,-0.0034694672,-0.0036239624,-0.0032730103,0.0036754608,0.028060913,0.028442383,0.03994751,-0.01373291,-0.014015198,0.014823914,0.015472412,-0.010253906,-0.0019893646,0.014953613,0.013435364,0.00844574,0.026031494,0.017654419,-0.033355713,-0.01146698,-0.030349731,0.00017559528,0.008880615,-0.0053634644,-0.012535095,-0.0047950745,0.0022659302,0.0115356445,-0.03857422,0.02482605,-0.041046143,-0.02255249,0.0016927719,-0.014533997,0.018737793,0.02029419,0.012489319,0.007835388,0.008117676,0.057159424,0.0051116943,0.004840851,0.025985718,0.05038452,0.010345459,-0.027877808,-0.008407593,-0.008834839,0.0067367554,0.008270264,-0.025100708,0.026351929,0.042816162,-0.030685425,0.017166138,0.0053596497,0.021850586,-0.025115967,0.0007891655,0.0008735657,0.017288208,-0.020553589,0.027801514,-0.04019165,0.018844604,0.014892578,0.002565384,0.010177612,-0.032562256,-0.022827148,0.0025901794,0.0049858093,-0.03060913,0.037078857,-0.008956909,0.026611328,-0.012420654,-0.021713257,0.014854431,-0.03817749,-0.026443481,0.018920898,-0.0021877289,-0.018615723,0.019744873,-0.018661499,0.031066895,-0.03564453,-0.0004479885,0.023147583,-0.0013771057,-0.02130127,0.009803772,-0.019729614,-0.010185242,-0.0070648193,-0.012214661,0.0012893677,0.052337646,0.05126953,0.019607544,0.04196167,0.0074005127,0.0001065135,-0.04345703,-0.012451172,0.0016765594,-0.012756348,0.022537231,-0.006996155,0.05203247,0.035461426,0.0021572113,0.033355713,0.0357666,0.017227173,-0.0060768127,0.011207581,-0.005130768,0.034118652,-0.00069761276,0.027877808,0.0006542206,0.035614014,-0.04727173,0.0052986145,-0.0008864403,0.02268982,-0.03164673,0.033966064,0.06695557,0.03173828,-0.014503479,0.042633057,-0.007232666,-0.004676819,-0.029312134,-0.007446289,0.06652832,0.01651001,0.034973145,0.038269043,0.016983032,0.0050964355,0.008102417,-0.017089844,-0.032684326,0.064819336,0.023223877,-0.02482605,-0.02003479,-0.017089844,0.0045928955,-0.05618286,-0.027053833,0.004760742,-0.015701294,0.005832672,-0.018798828,-0.0016927719,-0.010604858,0.004497528,0.008804321,0.00434494,-0.020187378,0.03387451,0.0076789856,0.0018501282,0.026855469,0.007144928,0.035064697,-0.03439331,-0.016906738,0.009735107,0.031280518,0.0022773743,-0.014701843,0.021636963,0.030090332,0.06323242,0.037139893,-0.013542175,0.0048713684,0.02406311,0.01953125,0.0052719116,0.04071045,0.025283813,0.004081726,0.025787354,0.037261963,0.016998291,-0.030014038,-0.004234314,-0.005317688,0.0021190643,-0.016921997,-0.021148682,-0.00016224384,-0.00982666,0.011581421,0.0014047623,-0.013954163,0.03640747,0.019561768,0.0049858093,0.012535095,-0.0016374588,0.008964539,0.0045547485,0.009498596,0.016845703,-0.011489868,0.029785156,0.013542175,0.020233154,-0.03439331,0.028442383,0.008117676,-0.020202637,-0.0146865845,0.011077881,-0.047698975,0.0010595322,-0.0017652512,-0.007259369,-0.034454346,0.018218994,0.024551392,0.0043678284,0.03765869,0.023925781,-0.00504303,-0.0027179718,0.014945984,0.014373779,-0.012428284,-0.010688782,-0.019699097,0.013656616,0.028518677,-0.0034332275,0.017913818,-0.022827148,0.0022125244,0.010406494,-0.014556885,0.010475159,0.00484848,-0.019134521,-0.036621094,0.014259338,0.05303955,0.01991272,0.028335571,-0.006690979,-0.0154953,0.0059013367,0.019058228,0.008453369,0.01828003,-0.018463135,0.028518677,-0.0001860857,0.043273926,0.033233643,0.0055732727,0.031097412,-0.020980835,-0.0129470825,0.0013694763,-0.018615723,0.012916565,-0.019088745,0.012664795,-0.01574707,0.027954102,-0.01802063,-0.025177002,0.00066423416,-0.009689331,-0.012557983,-0.02848816,0.0062942505,0.013305664,0.022888184,0.038726807,0.023025513,-0.015625,0.06488037,-0.012771606,0.049682617,-0.024734497,-0.0037899017,0.048187256,0.033935547,0.023345947,0.0053253174,0.0037136078,-0.017562866,0.012382507,0.053955078,0.03314209,0.0031700134,0.0007610321,-0.018463135,0.034973145,0.01285553,0.026611328,-0.00073194504,-0.024902344,0.008171082,-0.007080078,-0.02923584,0.012359619,-0.0064888,0.009681702,0.042999268,-0.04711914,-0.023727417,-0.015533447,-0.032318115,0.018585205,-0.0059318542,0.011817932,-0.0030994415,-0.026031494,0.0101623535,-0.01928711,-0.006629944,-0.0052757263,0.042633057,-0.049438477,-0.01977539,0.0033454895,0.02949524,-0.029937744,0.021224976,0.04168701,-0.018707275,0.008842468,0.041046143,-0.0006637573,0.041107178,-0.003982544,0.01802063,0.050445557,0.006866455,-0.0041236877,0.017501831,0.015159607,-0.023025513,0.012527466,0.03704834,-0.0067443848,0.011619568,0.009925842,-0.010223389,-0.0008649826,0.007820129,0.005027771,-0.009147644,-0.0087509155,-0.0035209656,-0.01171875,0.016784668,0.011856079,-0.009895325,-0.0027484894,-0.01436615,0.013465881,0.022720337,-0.0005326271,-0.03363037,-0.008117676,0.018981934,0.019943237,-0.003583908,-0.012817383,-0.012199402,-0.04928589,0.015914917,0.034851074,0.01084137,0.001241684,-0.0340271,-0.0012607574,0.021911621,0.01701355,0.010910034,0.001917839,-0.0062294006,0.00007146597,-0.014221191,-0.009643555,-0.013374329,-0.011100769,0.013824463,0.028167725,-0.0071487427,-0.022750854,0.013885498,0.009590149,0.01121521,-0.012748718,-0.021118164,0.03112793,-0.011054993,-0.0256958,-0.0013456345,0.015602112,-0.023498535,-0.01739502,-0.017852783,0.024505615,0.046875,-0.0141067505,-0.012084961,0.0013113022,0.0024051666,0.019729614,0.026107788,0.007904053,0.040283203,0.020080566,-0.014442444,-0.026443481,0.024124146,-0.017578125,-0.024139404,0.011405945,-0.010627747,-0.02507019,0.030807495,0.0008430481,-0.008491516,-0.034118652,-0.012413025,-0.0010147095,-0.014427185,0.02960205,-0.008277893,0.013092041,-0.029083252,0.0051612854,0.0068092346,0.008811951,-0.037017822,-0.022735596,-0.003282547,-0.012557983,-0.04788208,0.004371643,-0.03186035,0.008644104,-0.022003174,-0.0072402954,0.009132385,0.034851074,-0.008621216,0.011886597,0.0030727386,0.027496338,0.011817932,0.017654419,0.037902832,-0.018997192,-0.031921387,-0.014671326,0.012397766,-0.012107849,0.026763916,-0.0045318604,0.0385437,0.0140686035,-0.0047035217,0.0013828278,-0.0032196045,-0.014518738,-0.0087890625,-0.021011353,-0.016021729,0.011489868,0.02885437,-0.00548172,-0.012954712,0.046966553,-0.013961792,-0.0012722015,0.021896362,0.048706055,0.0011110306,0.043121338,-0.0052986145,-0.010269165,-0.008834839,0.0046844482,-0.023895264,0.014595032,0.015548706,0.006362915,0.00012528896,0.0027198792,0.0057411194,-0.01965332,0.012138367,0.026016235,0.0017137527,-0.016571045,0.029418945,0.0033855438,0.0026950836,-0.015777588,-0.019973755,0.009437561,0.035095215,0.018112183,0.0020046234,-0.0026111603,0.023239136,-0.008781433,0.014183044,0.0141067505,-0.027511597,-0.02519226,-0.027954102,-0.03643799,0.02458191,0.009170532,0.013549805,-0.004421234,0.022583008,-0.009292603,-0.039733887,-0.016647339,0.032165527,0.0010137558,-0.009811401,-0.015380859,-0.0030574799,0.0024433136,-0.024429321,0.005542755,-0.045715332,-0.022521973,-0.0045318604,-0.023147583,0.013961792,-0.0011138916,-0.0152282715,0.0061569214,-0.0063285828,0.008285522,0.015533447,0.026290894,0.00029110909,0.0011434555,-0.0055503845,0.012245178,-0.014198303,0.011962891,-0.012619019,-0.0071487427,0.029342651,-0.012382507,0.01878357,-0.010864258,0.018707275,0.0054397583,-0.0035305023,0.029678345,0.000849247,0.010696411,-0.029708862,0.0055236816,-0.0011978149,-0.0018730164,0.017868042,-0.012413025,-0.020126343,0.0045280457,-0.008552551,-0.032806396,0.008300781,0.030471802,0.03756714,-0.015914917,0.036254883,-0.016723633,0.004470825,0.019454956,0.009307861,-0.017150879,0.0014019012,0.054351807,-0.00024437904,-0.012123108,-0.0033054352,0.0013542175,-0.018234253,-0.024383545,0.011749268,-0.005126953,-0.013000488,0.014503479,0.0073547363,0.032073975,0.008041382,0.01260376,0.02128601,-0.00095558167,0.021194458,0.0062789917,0.04788208,-0.0074005127,-0.02532959,0.0036067963,0.031433105,-0.023529053,-0.0011148453,-0.0060577393,0.008132935,-0.036193848,0.020019531,-0.009841919,0.028625488,-0.02420044,0.015022278,-0.016418457,-0.013450623,-0.018203735,-0.0009484291,-0.045288086,0.007232666,0.046844482,0.024047852,0.010429382,-0.001657486,-0.02809143,0.044281006,0.055847168,-0.0073928833,-0.023925781,-0.010986328,0.009002686,-0.008758545,-0.010353088,0.010139465,-0.03765869,-0.018737793,-0.0036125183,-0.023910522,0.006412506,0.0047798157,0.0042648315,0.018295288,-0.015357971,0.007369995,0.028884888,-0.0004234314,-0.0017356873,0.0063209534,-0.008399963,0.04623413,0.021347046,-0.015792847,0.023651123,0.015823364,-0.02545166,0.056488037,-0.018707275,0.012229919,-0.015960693,0.004512787,-0.040374756,-0.013175964,-0.005683899,0.005493164],"createdAt":"2026-04-18T19:29:30.215Z","updatedAt":"2026-04-23T08:02:07.727Z","lastSeenAt":"2026-04-23T08:02:07.727Z","tsv":"'/api':150 '/api/v1/apikeys/3':85 '/apikeys/3':193 '/docs':149 '/pricing':151 '/readme':153 '/request':127 '0.02':10,24,111,126 '000':100 '0x8335':105 '20':99 '2913':106 '402':217 '6':116 'accept':86 'access':36,143,187 'across':130 'advertis':95 'ai':62 'analyt':61 'api':4,18,35,58,135,186,202 'api key generation' 'avail':179 'base':8,22,80,101,108 'base usdc api' 'behind':72,183 'challeng':94,218 'confirm':123,212 'connect':159 'content':165 'data':60 'decim':117 'document':144,174,208 'endpoint':6,20,30,47,84,132,210 'equal':110 'exact':181 'exampl':178 'extrem':146 'financ':65 'flat':125 'function':182 'gate':3,17,71 'host':54 'infrastructur':68 'instant':142 'json':91 'json-api' 'key':5,19,136,203 'label':188 'land':121 'learn':64 'limit':140 'live':213 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'mani':46 'maxamountrequir':97 'may':197 'micropay':74 'micropayment' 'micropayment api' 'model':129 'network':81 'offer':48 'one':44 'openapi':169 'page':122,154 'particular':191 'path':192 'pay':9,23 'pay-per-call api' 'pay-per-request' 'payment':40 'per':13,27,112 'platform':52,119 'post':87 'post-method' 'premium':34,185 'premium api access' 'price':128 'prompt':161 'protocol':41 'provid':33 'provis':198 'rate':139 'render':156 'request':14,28,88,113 'request/response':172 'requir':137 'respons':219 'return':90,200 'schema':173 'settl':75 'span':59 'spars':147 'spec':170 'specif':83 'suit':56 'unclear':195 'unit':102 'usag':177 'usdc':12,26,77,104,114 'usdc-base' 'use':115 'util':69 'valid':216 'via':37,214 'wallet':160 'web3':66 'x402':2,16,39,73,93 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"eedd5b3a-16b2-4836-a34e-fd194f697566","listingId":"b1211e33-0d27-4c64-8e9b-d152b897c5bb","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:30.215Z"}],"sources":[{"listingId":"b1211e33-0d27-4c64-8e9b-d152b897c5bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:30.215Z","lastSeenAt":"2026-04-23T08:02:07.727Z"}],"details":{"listingId":"b1211e33-0d27-4c64-8e9b-d152b897c5bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/3 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/3"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/3"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring API keys or premium access tokens via a single micropayment","Agent-driven programmatic access to gated API resources without traditional subscriptions","Integrating pay-per-use API access into automated workflows"],"bestFor":["Developers wanting subscription-free, pay-per-call API access","AI agents that need to autonomously purchase API credentials","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.092Z"},"updatedAt":"2026-04-23T08:02:07.727Z"}}