{"id":"9fe88030-0d58-4fa8-9c35-0d4b20df07f0","shortId":"ZTWEUc","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 part of a broader platform that offers a variety of pay-per-call API endpoints spanning data & analytics, 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/70` appears to be an API key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys required, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) all rendered only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas and usage documentation are unavailable. The actual behavior behind this specific endpoint (what it returns upon successful payment) is not documented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-provisioning","no-rate-limits"],"categories":["infrastructure","api-access"],"synonyms":["premium API access","x402 API key","pay-per-call API","USDC API payment","Base network API","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no content beyond 'Connect wallet'","No OpenAPI or request/response schema available — actual endpoint behavior is unknown","The specific purpose of /api/v1/apikeys/70 (what it returns on successful payment) is undocumented","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/70","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation pages are empty (only 'Connect wallet'). No OpenAPI spec, no request/response schema, and no explanation of what the endpoint actually returns upon successful payment. The listing is effectively a stub with pricing and liveness confirmed but little else.","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":"2026-04-19T15:16:41.089Z","embedding":[-0.011695862,-0.030700684,0.045532227,0.010757446,0.016464233,-0.03933716,-0.009857178,0.061676025,0.058776855,-0.07501221,0.025375366,-0.037231445,-0.04534912,-0.042877197,-0.030166626,0.011436462,-0.029205322,0.010681152,-0.06088257,0.032806396,0.040740967,-0.032104492,-0.0018100739,0.05908203,-0.0022792816,-0.01134491,-0.0067100525,-0.030441284,-0.0068855286,-0.03640747,0.029586792,-0.024963379,-0.023406982,0.02909851,-0.033447266,-0.0017871857,-0.005783081,0.038360596,0.026062012,-0.009025574,-0.0059318542,-0.05984497,0.0015153885,0.024017334,-0.036621094,-0.001004219,-0.009155273,-0.03378296,-0.023651123,0.0000056624413,-0.03152466,-0.0039749146,-0.017227173,0.0021648407,0.0036144257,0.007873535,-0.009353638,-0.02722168,0.008872986,0.029037476,0.02784729,-0.05429077,-0.003326416,0.017227173,0.008705139,0.052947998,-0.0021858215,0.053253174,0.013420105,0.052581787,0.04156494,0.052001953,0.033599854,0.012138367,-0.010520935,-0.0063056946,0.0012540817,0.051757812,-0.0037384033,-0.018310547,-0.014213562,-0.020019531,-0.04522705,-0.01763916,-0.018920898,-0.07733154,-0.027023315,0.005886078,-0.01499939,0.02268982,-0.076049805,-0.017669678,-0.0058135986,0.028213501,0.015625,0.00466156,-0.036499023,0.012626648,-0.002729416,0.021987915,0.021652222,-0.03869629,0.01940918,0.02078247,0.05230713,0.051452637,0.016143799,0.029922485,0.000030517578,-0.032043457,-0.034698486,0.0014276505,-0.01890564,-0.010154724,0.03024292,-0.015609741,-0.017044067,0.014907837,-0.03289795,0.019836426,-0.059631348,0.052703857,0.02406311,-0.022399902,-0.0029678345,-0.047302246,-0.0074691772,-0.0044898987,-0.030334473,-0.025650024,0.006088257,0.005756378,0.017425537,0.0005941391,-0.034942627,0.013435364,-0.01360321,-0.023071289,-0.045166016,-0.007904053,0.022003174,-0.037994385,0.029403687,0.03543091,-0.10418701,-0.010932922,-0.06021118,0.012519836,-0.024353027,-0.02178955,0.015235901,0.0059432983,0.0039749146,-0.0071487427,0.0028514862,-0.013641357,-0.005908966,0.027069092,-0.0044784546,0.042938232,-0.018203735,0.03753662,0.03375244,0.018310547,0.018737793,0.052947998,0.0059280396,-0.08288574,-0.076293945,-0.03564453,-0.011428833,-0.0026874542,-0.036193848,0.026153564,-0.018249512,-0.07122803,-0.033721924,0.00061798096,-0.011695862,-0.03527832,-0.012214661,-0.024459839,0.014030457,-0.0049438477,-0.0491333,0.00031399727,-0.02330017,0.0635376,0.018920898,-0.00009274483,0.031921387,-0.011581421,0.055236816,0.015037537,-0.013679504,-0.041015625,0.011108398,-0.022232056,0.036987305,0.006969452,0.004371643,-0.04055786,0.02798462,0.05859375,0.024993896,-0.01864624,0.013160706,-0.041900635,-0.03062439,-0.026184082,0.010925293,0.008705139,0.003917694,0.016448975,-0.030441284,-0.016616821,-0.002817154,0.009147644,0.015655518,0.058502197,-0.02053833,-0.0047187805,0.022521973,0.027908325,-0.040802002,0.050231934,0.02798462,0.02128601,-0.027694702,-0.022964478,0.029800415,0.03363037,-0.027252197,0.0033874512,-0.023727417,0.021011353,-0.0061454773,0.011619568,0.014602661,-0.014198303,-0.015670776,-0.03918457,-0.01966858,0.02279663,-0.01210022,-0.014213562,-0.045928955,-0.061187744,0.04171753,0.044006348,0.0075912476,-0.0070991516,0.005378723,-0.02909851,-0.005569458,-0.06506348,0.04724121,0.07556152,-0.008094788,-0.02330017,0.02810669,-0.011871338,-0.028701782,-0.008392334,0.0014419556,-0.031097412,-0.013114929,0.02293396,-0.045562744,0.0046958923,0.019607544,0.019577026,0.05807495,-0.02571106,-0.022598267,-0.012397766,0.0065612793,0.014083862,-0.051361084,-0.022079468,0.015701294,0.01727295,0.048919678,-0.015197754,0.01777649,-0.0022773743,0.011108398,-0.009346008,-0.023239136,-0.026428223,-0.021484375,0.027130127,0.012954712,-0.05203247,0.028518677,0.0015611649,0.042114258,-0.044006348,0.03050232,-0.021438599,0.0158844,0.04043579,-0.01651001,-0.059326172,-0.008430481,0.033447266,0.03967285,0.05307007,0.022781372,0.004722595,0.008140564,0.0748291,-0.017181396,-0.006324768,0.0017471313,0.019195557,0.03463745,-0.008049011,-0.06137085,-0.044525146,-0.0124053955,-0.017349243,0.019851685,-0.027389526,0.034210205,-0.005844116,0.0051116943,-0.014312744,0.015991211,-0.031677246,0.026870728,-0.022262573,0.007881165,-0.01927185,-0.028060913,-0.006904602,0.028884888,-0.014083862,0.0066452026,0.044433594,0.0056533813,-0.0068511963,-0.024307251,-0.01878357,-0.020706177,0.006263733,0.039215088,0.018035889,0.016357422,0.03857422,-0.032470703,0.022766113,0.023422241,-0.0005965233,0.040527344,-0.012481689,-0.0009627342,-0.049804688,-0.058410645,-0.007987976,-0.01828003,0.035064697,0.0032978058,-0.0014400482,0.047027588,-0.009613037,-0.013435364,-0.05532837,0.024246216,-0.028884888,-0.00055933,0.028701782,-0.015655518,-0.045715332,0.005340576,0.004211426,0.01626587,0.029953003,0.02444458,0.007949829,0.07904053,0.042175293,0.0035953522,-0.006702423,0.017623901,0.013290405,-0.011734009,-0.023666382,-0.025558472,0.0077400208,0.028213501,-0.026687622,-0.023391724,-0.07727051,0.07220459,0.034942627,0.07550049,0.0073509216,0.0031528473,0.06137085,-0.026412964,0.014907837,-0.012741089,-0.008506775,-0.016036987,-0.05441284,0.02041626,-0.012924194,-0.0027618408,-0.042175293,0.04055786,0.012634277,0.011566162,-0.056671143,0.059387207,0.012145996,-0.008659363,0.015068054,0.0050735474,0.039642334,0.046783447,-0.044708252,-0.0074157715,0.020248413,-0.024276733,0.0015535355,0.040008545,-0.0027160645,-0.020523071,-0.05496216,-0.025405884,-0.0068855286,-0.02178955,-0.06933594,-0.007385254,0.01235199,0.013549805,0.020965576,-0.035003662,-0.023086548,-0.009124756,-0.02784729,-0.05517578,0.012069702,-0.049316406,0.01512146,0.03591919,-0.036468506,-0.016799927,0.00459671,-0.0038089752,-0.015670776,0.020828247,0.01121521,0.006134033,-0.050811768,0.027175903,0.009857178,0.0025463104,0.020568848,0.014167786,0.03189087,0.010169983,0.03289795,0.023590088,-0.016464233,-0.050689697,0.038238525,-0.04196167,0.010009766,0.00079870224,-0.030761719,-0.004585266,-0.017227173,-0.040740967,-0.022949219,0.016647339,-0.020858765,0.015144348,0.044921875,-0.04888916,-0.013717651,-0.05493164,-0.024230957,0.0032176971,0.061401367,0.037200928,-0.0038547516,-0.058502197,-0.008964539,0.01689148,0.0056915283,0.0118255615,-0.0146102905,-0.0075531006,-0.0062828064,-0.004386902,-0.030258179,-0.0071487427,0.038116455,-0.011962891,-0.0014772415,0.013832092,0.011802673,0.0021781921,0.018157959,0.009788513,0.02709961,-0.034454346,-0.0055656433,-0.019485474,0.00687027,-0.001701355,-0.009613037,-0.040649414,0.043670654,0.013053894,0.04159546,-0.03567505,0.008094788,0.006275177,0.022338867,0.009689331,-0.0018749237,-0.007598877,-0.0010089874,-0.05105591,-0.07788086,0.035949707,-0.0146102905,0.031204224,0.012771606,0.0067367554,0.033691406,-0.012680054,0.0033073425,0.03050232,-0.032440186,-0.014663696,-0.0309906,-0.02658081,-0.015365601,0.0115737915,-0.020614624,0.008628845,-0.010017395,0.010910034,-0.016448975,-0.03201294,0.019927979,0.017486572,-0.006477356,0.0074882507,0.002357483,0.020065308,0.05517578,0.005874634,-0.025482178,0.026992798,0.009971619,0.006389618,0.0023479462,0.039855957,0.02558899,-0.02406311,0.0021438599,0.008018494,-0.0046958923,-0.0154953,-0.012084961,0.009338379,0.024902344,-0.0024909973,-0.033111572,0.021911621,0.023651123,-0.022613525,-0.0062675476,0.022598267,0.024963379,-0.036315918,0.025024414,0.020584106,0.06011963,-0.007827759,-0.01360321,-0.003835678,0.032684326,0.009475708,0.0050849915,-0.017669678,0.013511658,-0.020767212,0.010658264,-0.0052223206,0.0017910004,0.014122009,-0.009437561,-0.00047898293,0.024520874,0.004890442,-0.01335144,-0.033721924,-0.0021438599,-0.011398315,-0.0132751465,0.008872986,0.017227173,0.030166626,-0.025299072,0.01737976,0.010673523,-0.021743774,-0.0107040405,-0.01285553,0.04800415,-0.0035305023,0.0003657341,0.010292053,0.011405945,0.028366089,-0.04598999,-0.0040893555,0.02053833,0.009742737,-0.020858765,-0.06726074,-0.027175903,-0.0050468445,0.04574585,0.006084442,0.0052757263,0.018447876,0.007610321,-0.005191803,0.015792847,0.008163452,-0.011291504,-0.012954712,-0.034820557,-0.015792847,0.0026741028,-0.005329132,-0.022369385,0.021636963,-0.021896362,-0.024276733,0.011650085,-0.0054740906,-0.0074806213,-0.0041122437,0.0030593872,0.029800415,0.006210327,0.014274597,-0.02331543,-0.032043457,0.0014677048,0.009353638,0.016799927,-0.03643799,0.02810669,-0.016235352,-0.017669678,-0.009109497,0.0033874512,0.011940002,0.020568848,-0.004005432,0.034210205,-0.05911255,0.034454346,-0.050201416,0.0038871765,-0.005607605,-0.026397705,-0.0036201477,-0.041870117,-0.024902344,0.03656006,-0.014404297,0.000021874905,-0.026367188,-0.03265381,0.0079956055,-0.06109619,0.027770996,0.027511597,0.03062439,-0.03845215,0.000048160553,0.0031776428,-0.00037169456,-0.004787445,-0.0074501038,-0.00894165,0.02192688,0.026611328,-0.00881958,-0.021408081,-0.019699097,-0.010261536,-0.011512756,-0.037872314,-0.053222656,-0.01348114,0.024612427,-0.00046730042,0.00579834,-0.03451538,-0.027389526,-0.001991272,-0.039916992,0.012580872,-0.008575439,0.00091028214,0.0028839111,-0.012718201,0.006969452,0.032958984,-0.035095215,0.04425049,0.006084442,-0.009780884,-0.033294678,0.0077667236,0.03982544,0.014778137,0.0050086975,-0.018341064,-0.011260986,-0.02973938,-0.045715332,-0.013961792,-0.011390686,0.0052375793,0.00566864,0.0049362183,-0.045440674,-0.015220642,-0.032318115,-0.007423401,0.020523071,0.039489746,0.008728027,0.0017080307,0.0051994324,-0.013549805,-0.007736206,-0.03363037,0.012229919,0.010231018,-0.0041275024,0.025283813,0.047454834,0.02545166,-0.006454468,0.005344391,0.002275467,0.026046753,-0.015960693,0.010185242,-0.02696228,0.005218506,-0.001581192,-0.018707275,-0.027145386,-0.0017566681,0.0725708,0.0158844,-0.0020885468,-0.003364563,-0.01525116,0.018173218,0.035186768,-0.06756592,-0.0018911362,-0.023971558,0.015823364,-0.0096206665,0.016189575,-0.0006790161,-0.007293701,-0.016693115,-0.05227661,0.0000104904175,0.013191223,0.0026111603,-0.06304932,-0.018814087,-0.03994751,-0.0154418945,-0.01739502,-0.011306763,-0.0054779053,0.0052948,-0.022842407,-0.08380127,0.010231018,0.04815674,0.022720337,0.009513855,-0.014122009,-0.011116028,0.015716553,-0.033935547,-0.01638794,0.025405884,-0.022872925,-0.020828247,-0.021850586,0.03741455,-0.020965576,-0.020462036,0.0184021,0.000022649765,0.037628174,-0.008850098,0.017166138,-0.007534027,0.0088272095,-0.009140015,0.0026741028,-0.004371643,-0.009002686,0.021957397,-0.047821045,0.024002075,0.018096924,0.021850586,0.0040359497,0.023513794,0.03945923,-0.04925537,-0.012176514,0.028961182,-0.010787964,0.023345947,-0.031707764,0.047790527,0.011787415,-0.0016403198,0.015388489,-0.01637268,-0.034362793,-0.050628662,-0.033203125,0.029022217,0.016189575,0.012008667,-0.013473511,-0.003955841,0.035308838,0.0015935898,0.005672455,-0.03479004,-0.023788452,-0.02609253,-0.0026493073,0.010307312,-0.0028190613,0.008224487,0.021316528,0.030181885,0.040527344,-0.0041160583,-0.0135650635,0.008506775,0.012840271,-0.010246277,-0.00667572,0.021575928,0.017410278,0.010383606,0.033081055,0.019180298,-0.034088135,-0.0090408325,-0.023498535,-0.011222839,0.020111084,-0.011985779,-0.017227173,-0.013244629,0.010528564,0.0042304993,-0.039520264,0.016601562,-0.050842285,-0.022476196,0.006690979,-0.008506775,0.016113281,0.011238098,0.013847351,0.01108551,0.008514404,0.06738281,0.010665894,-0.0033168793,0.032104492,0.052215576,0.009880066,-0.01713562,0.0016937256,-0.009407043,0.004951477,0.0048217773,-0.025802612,0.024368286,0.030838013,-0.022445679,0.020111084,0.0046691895,0.021881104,-0.025390625,-0.0008907318,0.0027580261,0.011123657,-0.027404785,0.037597656,-0.037231445,0.009048462,0.015083313,0.004840851,-0.006454468,-0.028945923,-0.030914307,0.005241394,0.004432678,-0.026870728,0.036315918,-0.0058555603,0.023925781,-0.017669678,-0.016967773,0.008003235,-0.037231445,-0.026992798,0.024093628,-0.016708374,-0.010276794,0.018081665,-0.018447876,0.036590576,-0.030548096,-0.00037765503,0.02079773,-0.012252808,-0.018447876,0.0048713684,-0.02027893,-0.009117126,-0.004398346,-0.011695862,-0.0012798309,0.042938232,0.051483154,0.018997192,0.042877197,0.003665924,0.0035209656,-0.04876709,-0.016235352,0.0054512024,-0.016479492,0.020706177,-0.010353088,0.052337646,0.03189087,0.010658264,0.030807495,0.02998352,0.017974854,-0.010406494,0.013381958,-0.00749588,0.024505615,-0.005504608,0.028167725,-0.010299683,0.034088135,-0.04800415,0.000682354,0.0063209534,0.010002136,-0.03262329,0.031021118,0.06933594,0.028137207,-0.014907837,0.03878784,0.0009870529,-0.008323669,-0.025238037,-0.01876831,0.045074463,0.006515503,0.0340271,0.03933716,0.0064888,-0.000644207,0.021652222,-0.021896362,-0.03189087,0.05807495,0.026733398,-0.026031494,-0.006629944,-0.016967773,0.0060195923,-0.052337646,-0.028060913,0.007827759,-0.008834839,0.0021266937,-0.02243042,-0.0029830933,-0.015899658,0.013168335,0.021224976,0.016799927,-0.016174316,0.037963867,0.0075416565,0.0060577393,0.02859497,0.0053100586,0.034088135,-0.026428223,-0.014770508,0.008636475,0.030914307,0.0038967133,-0.014511108,0.017333984,0.019226074,0.064086914,0.034851074,-0.015510559,-0.00017797947,0.030685425,0.020507812,0.0046310425,0.05038452,0.025558472,0.004470825,0.030578613,0.031982422,0.01687622,-0.031677246,-0.0070610046,0.0006914139,0.010063171,-0.016021729,-0.023742676,0.008506775,-0.02078247,0.018341064,0.00022530556,-0.013031006,0.037231445,0.028244019,0.0047187805,0.0068893433,0.0024471283,0.018417358,-0.00121212,0.003332138,0.013435364,-0.015380859,0.026626587,0.013153076,0.019134521,-0.027694702,0.031402588,0.004009247,-0.02128601,-0.020401001,0.007041931,-0.050994873,-0.002729416,0.0010766983,0.0005302429,-0.034088135,0.017578125,0.029144287,0.003967285,0.035858154,0.019638062,0.0018692017,0.0021190643,0.009765625,0.015975952,-0.0146102905,-0.014167786,-0.024246216,0.005340576,0.029220581,-0.00048542023,0.016281128,-0.024871826,0.010131836,0.01146698,-0.025604248,0.008270264,0.00415802,-0.016174316,-0.03869629,0.0090408325,0.047973633,0.018554688,0.03152466,-0.0056114197,-0.015296936,0.0078125,0.020828247,0.011657715,0.015609741,-0.025238037,0.02999878,0.0014772415,0.047027588,0.0362854,0.011520386,0.024780273,-0.020004272,-0.010292053,0.006576538,-0.010856628,0.01423645,-0.024673462,0.009811401,-0.004398346,0.031341553,-0.018356323,-0.02609253,0.0075149536,-0.017562866,-0.0093307495,-0.026733398,0.007827759,0.010070801,0.023468018,0.046783447,0.029037476,-0.01902771,0.0680542,-0.004623413,0.05456543,-0.020187378,-0.016143799,0.04135132,0.03515625,0.027740479,0.009597778,0.0040893555,-0.014755249,0.0054130554,0.042816162,0.037078857,0.0037994385,0.0039253235,-0.022201538,0.021835327,-0.0009531975,0.03366089,-0.0021095276,-0.017929077,0.0030097961,0.0004005432,-0.024795532,0.012069702,-0.009681702,0.0039901733,0.04244995,-0.043182373,-0.016723633,-0.014213562,-0.027648926,0.023284912,-0.008163452,0.014167786,-0.011116028,-0.021743774,0.0021514893,-0.012840271,-0.0068473816,-0.005630493,0.034332275,-0.050048828,-0.009529114,-0.0039100647,0.031951904,-0.018814087,0.020263672,0.038208008,-0.0135650635,0.0023708344,0.042999268,-0.0059013367,0.041046143,-0.0098724365,0.028137207,0.05130005,0.010192871,-0.011726379,0.012290955,0.010528564,-0.016799927,0.00856781,0.037078857,-0.0068244934,0.005973816,0.00806427,-0.012260437,0.006137848,0.008087158,-0.0063476562,0.0036373138,-0.015586853,0.00018668175,-0.0062179565,0.021606445,0.012237549,-0.013000488,-0.0026741028,-0.012260437,0.022109985,0.027816772,0.0053482056,-0.032226562,-0.0019483566,0.019134521,0.015930176,-0.010261536,-0.019088745,-0.01423645,-0.049926758,0.014808655,0.031311035,0.011947632,-0.00081062317,-0.036071777,0.0026454926,0.015380859,0.013717651,0.004550934,0.0015001297,-0.0053634644,-0.0047416687,-0.010032654,-0.014083862,-0.01928711,-0.0095825195,0.016601562,0.03656006,-0.009063721,-0.019241333,0.021011353,-0.0025978088,0.0062675476,-0.0029964447,-0.013587952,0.033477783,-0.004878998,-0.009346008,-0.0007033348,0.012062073,-0.028945923,-0.015106201,-0.013435364,0.022659302,0.038085938,-0.01828003,-0.023925781,0.008872986,0.015602112,0.017578125,0.033477783,0.0047836304,0.04864502,0.029541016,-0.006626129,-0.019302368,0.003993988,-0.016479492,-0.027023315,0.010696411,-0.013122559,-0.028259277,0.03527832,0.0043182373,-0.0013237,-0.02709961,-0.018005371,0.0012016296,-0.009902954,0.027328491,-0.015571594,0.012878418,-0.031280518,-0.00074481964,0.0013237,0.007972717,-0.0357666,-0.02281189,-0.0009326935,-0.009605408,-0.051483154,0.0001757145,-0.03463745,0.0057868958,-0.010787964,-0.0031700134,0.00044679642,0.03338623,-0.0033054352,0.0040283203,0.017532349,0.027252197,0.011146545,0.014533997,0.030166626,-0.013938904,-0.027511597,-0.0211792,0.016906738,-0.018035889,0.022003174,-0.012535095,0.035339355,0.011520386,-0.00756073,0.0020198822,-0.008049011,-0.018798828,-0.0038833618,-0.013717651,-0.01007843,0.022079468,0.0211792,-0.0016326904,-0.009643555,0.044677734,-0.019058228,-0.010253906,0.022003174,0.05316162,0.0013484955,0.04940796,0.0061416626,-0.007091522,-0.026351929,0.004283905,-0.029434204,0.009544373,0.020263672,-0.0011796951,-0.00026774406,-0.0029621124,0.004119873,-0.013717651,0.009963989,0.016937256,0.0074310303,-0.011734009,0.036132812,0.0058250427,0.0043525696,-0.028945923,-0.015090942,0.0077590942,0.030731201,0.017868042,0.0035915375,-0.001531601,0.010917664,-0.0099105835,0.0071105957,0.011703491,-0.024642944,-0.030395508,-0.020950317,-0.038635254,0.01108551,0.016845703,0.015899658,-0.0022411346,0.01348114,-0.0051651,-0.03579712,-0.014160156,0.028869629,0.011665344,-0.0124053955,-0.012084961,0.012809753,0.010108948,-0.021621704,0.004901886,-0.037322998,-0.026992798,-0.0046577454,-0.023147583,0.007282257,-0.000009953976,-0.01637268,0.0073890686,-0.013473511,0.0024642944,0.012321472,0.02381897,-0.0016021729,-0.0020446777,0.006916046,0.014732361,-0.010307312,0.00831604,-0.021194458,-0.0015926361,0.025741577,-0.00048351288,0.014831543,-0.008972168,0.01828003,-0.009002686,-0.016494751,0.029281616,-0.0011844635,0.0061302185,-0.02746582,0.002439499,-0.0019721985,-0.005344391,0.02798462,-0.021469116,-0.03338623,0.0033512115,-0.021652222,-0.034851074,-0.0019187927,0.028701782,0.033966064,-0.009941101,0.030593872,-0.021957397,-0.0023708344,0.01525116,-0.0024662018,-0.014404297,-0.004169464,0.05429077,0.006866455,-0.00088500977,-0.0045700073,0.012107849,-0.029769897,-0.016662598,0.013015747,-0.0007042885,-0.012168884,0.018829346,0.005832672,0.034454346,-0.007320404,-0.0013189316,0.01890564,0.0022621155,0.026046753,0.00044965744,0.048339844,-0.010185242,-0.023223877,0.006462097,0.030319214,-0.019561768,0.0010986328,-0.0049438477,0.009803772,-0.03869629,0.021453857,-0.0116119385,0.023834229,-0.02935791,0.003753662,-0.017288208,-0.022354126,-0.03274536,-0.008018494,-0.037475586,0.0021591187,0.046081543,0.018188477,0.015350342,-0.005065918,-0.027389526,0.04638672,0.050811768,0.00029444695,-0.026733398,-0.01927185,0.0073661804,0.0012149811,0.0033550262,0.01322937,-0.028076172,-0.009918213,-0.0000064373016,-0.0128479,0.0008530617,-0.0064697266,0.008850098,0.0102005005,-0.008140564,0.006587982,0.03302002,-0.0045433044,-0.0068588257,0.003917694,-0.00035452843,0.048706055,0.030471802,-0.020324707,0.02746582,0.010658264,-0.034698486,0.059173584,-0.010978699,0.015670776,-0.015960693,0.004047394,-0.03845215,-0.013061523,-0.0026626587,0.0034675598],"createdAt":"2026-04-18T19:29:31.986Z","updatedAt":"2026-04-23T06:31:45.949Z","lastSeenAt":"2026-04-23T06:31:45.949Z","tsv":"'/api/v1/apikeys/70':107 '/docs':179 '/pricing':180 '/readme':181 '0.02':10,24,94,147 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '0x8335':141 '20':135 '2913':142 '300':161 '6':151 'Base network API' 'USDC API payment' 'accept':125 'access':36,116,176 'actual':203 'address':157 'advertis':166 'ai':63 'analysi':67 'analyt':62 'api':4,18,35,58,112,168 'api-key-provisioning' 'appear':108 'base':8,22,102,137,144 'behavior':204 'behind':205 'broader':47 'call':57 'challeng':120 'classif':70 'confirm':121 'connect':186 'content':192 'convers':87 'crawl':220 'data':61 'decim':152 'detail':194 'document':177,199,217 'embed':71 'endpoint':6,20,30,59,90,106,117,208 'equal':146 'estim':81 'exchang':76 'feed':75 'financ':72 'gas':80 'gate':3,17 'generat':88 'geocod':85 'given':148 'infrastructur':83 'instant':175 'key':5,19,113,169 'learn':65 'limit':173 'live':124 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':64 'materi':221 'network':103 'no-rate-limits' 'offer':50 'page':178 'part':44 'pay':9,23,55 'pay-per-cal':54 'pay-per-call API' 'pay-per-request' 'payment':40,131,153,214 'per':13,27,56,95 'platform':48,165 'post':126 'premium':34 'premium API access' 'price':74,92 'prompt':188 'protocol':41 'provid':33 'provis':114 'quot':79 'rate':77,172 'render':183 'request':14,28,96,127 'request/response':195 'requir':129,170 'return':211 'schema':196 'second':162 'sent':155 'sentiment':66 'settl':97 'span':60 'specif':105,207 'substant':191 'success':213 'summar':69 'text':68 'timeout':163 'token':78 'unavail':201 'unit':138 'upon':212 'usag':198 'usdc':12,26,99,140,149 'usdc-base' 'util':84 'valid':86 'varieti':52 'via':37 'wallet':187 'web3':73 'x402':2,16,39,119 'x402 API key' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d724c803-6504-402b-bd67-4b76f376ebf5","listingId":"9fe88030-0d58-4fa8-9c35-0d4b20df07f0","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:31.986Z"}],"sources":[{"listingId":"9fe88030-0d58-4fa8-9c35-0d4b20df07f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:31.986Z","lastSeenAt":"2026-04-23T06:31:45.949Z"}],"details":{"listingId":"9fe88030-0d58-4fa8-9c35-0d4b20df07f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/70 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/70"},{"claim":"All endpoints on the platform 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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/70"}],"useCases":["Programmatically purchasing or activating API keys via x402 micropayment","Agents autonomously acquiring access credentials for downstream API calls","Demonstrating x402 payment-gated resource provisioning"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that need to self-provision API access without manual signup","Micropayment-based API consumption without subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","High-volume batch operations where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.983Z"},"updatedAt":"2026-04-23T06:31:45.949Z"}}