{"id":"1a6b01ec-e469-4bd5-8432-b13ccc3471da","shortId":"aTw54f","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/99` is listed as \"Premium API Access\" and carries a maxAmountRequired of 20,000 base units of USDC (0.02 USDC = $0.02), consistent with the site-wide pricing. The x402 challenge was successfully captured (version 1, scheme \"exact\"), confirming the endpoint is live. Payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\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 description of what the `/api/v1/transactions/99` endpoint actually returns. The landing page lists 16 different API categories but provides no detail on input parameters or response formats for any of them. The purpose of this specific \"transactions/99\" endpoint is unclear and may be a demo or placeholder.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payments","serverless API billing"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The purpose and expected input/output of /api/v1/transactions/99 is completely undocumented","All documentation pages (/docs, /pricing, /README, /api) render only 'Connect wallet' with no content","The 16 listed API endpoints have no parameter or response format documentation","This may be a demo or showcase platform rather than a production service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/99","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/transactions/99","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 per request on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/transactions/99 is undocumented. The docs/pricing/README pages are all empty wallet-connect stubs.","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":"2026-04-19T14:00:37.224Z","embedding":[-0.022979736,-0.039916992,0.036346436,0.0146102905,0.009857178,-0.036590576,-0.027816772,0.036499023,0.064575195,-0.067871094,0.02708435,-0.04031372,-0.033691406,-0.048431396,-0.016998291,0.009254456,-0.0069389343,0.007598877,-0.037384033,0.023345947,0.022613525,-0.023620605,-0.03286743,0.0102005005,-0.004272461,-0.01890564,-0.004760742,0.0015068054,-0.018127441,-0.047698975,0.03677368,-0.024169922,0.0014371872,0.013626099,-0.009140015,-0.007888794,0.009857178,0.041229248,0.024520874,-0.020263672,0.005455017,-0.052642822,0.0033130646,-0.015266418,-0.059631348,0.0104599,0.00233078,-0.02305603,0.010253906,0.002538681,-0.048217773,-0.0014619827,-0.010406494,-0.00016963482,-0.003730774,0.011657715,-0.0063476562,0.0024547577,0.008148193,0.0048599243,-0.0135650635,-0.06842041,-0.019805908,-0.020904541,-0.0063819885,0.055725098,-0.010169983,0.03994751,0.0021762848,0.061584473,0.022766113,0.040527344,0.02281189,0.014442444,-0.00007945299,0.001791954,-0.013763428,0.05633545,-0.021575928,-0.03616333,-0.005004883,-0.016906738,-0.061340332,-0.01828003,0.0040512085,-0.05203247,-0.01625061,0.020584106,-0.03277588,0.026931763,-0.07507324,-0.0024909973,-0.0028972626,-0.008369446,0.0035171509,-0.026733398,-0.01864624,0.02178955,-0.009048462,0.018249512,-0.0010251999,-0.044677734,0.02671814,0.022369385,0.03805542,0.04623413,0.013748169,0.02835083,0.008430481,-0.012062073,-0.033325195,0.00907135,0.006099701,-0.014976501,0.014091492,0.011779785,-0.020690918,0.01625061,-0.02255249,0.021408081,-0.04559326,0.05340576,0.008415222,0.0046958923,0.0057411194,-0.05105591,-0.0059661865,0.019424438,-0.037139893,-0.0018062592,0.018829346,0.020843506,0.02949524,-0.013076782,-0.034332275,0.0021419525,-0.020645142,0.010391235,-0.056365967,-0.037200928,0.03503418,-0.025177002,0.026275635,0.046417236,-0.10083008,-0.012741089,-0.044067383,0.0069885254,-0.028747559,-0.014625549,0.013587952,0.015716553,-0.030258179,-0.023391724,-0.020767212,-0.03793335,-0.0057373047,0.048553467,-0.009742737,0.02949524,-0.024169922,0.023834229,0.013671875,0.01574707,0.015319824,0.028778076,0.005970001,-0.07434082,-0.088256836,-0.028823853,0.0044670105,-0.026809692,-0.04324341,0.0110321045,-0.0309906,-0.0791626,-0.018569946,-0.005554199,-0.0066375732,-0.040924072,-0.0014123917,-0.035858154,0.01876831,-0.015388489,-0.060638428,-0.0345459,-0.028396606,0.06451416,0.031173706,0.018341064,0.015838623,-0.0070152283,0.057647705,0.031066895,-0.003944397,-0.024291992,0.016784668,-0.014228821,0.02041626,-0.011581421,0.0141067505,-0.031173706,0.03543091,0.078125,-0.00970459,-0.032806396,-0.016860962,-0.046783447,-0.04650879,-0.036956787,0.022003174,0.011665344,-0.0107421875,0.023834229,-0.025131226,-0.024612427,-0.005458832,0.0236969,0.0084991455,0.05670166,0.013923645,-0.005432129,0.04510498,0.02192688,-0.049438477,0.042175293,0.04434204,0.022705078,-0.034942627,-0.047058105,0.026275635,0.05142212,-0.028030396,0.019195557,-0.012023926,0.025939941,-0.008415222,0.011520386,0.009498596,-0.0029506683,-0.033966064,-0.015930176,-0.01398468,0.016845703,0.017120361,-0.021011353,-0.03503418,-0.081970215,0.040802002,0.04736328,0.02796936,-0.0022716522,0.0039520264,-0.01828003,-0.0146102905,-0.07293701,0.05255127,0.07220459,0.0013799667,-0.0054969788,0.043304443,-0.019058228,-0.04296875,0.010696411,-0.026138306,-0.03552246,-0.015655518,0.01146698,-0.043548584,-0.0032444,0.020233154,0.022125244,0.055999756,-0.0054855347,-0.049194336,-0.025421143,-0.008430481,0.008773804,-0.03366089,-0.009216309,0.000060260296,0.022445679,0.022109985,0.0025520325,0.011451721,0.007785797,0.009773254,-0.007873535,0.011833191,-0.008460999,-0.029067993,0.012481689,0.012939453,-0.05569458,0.00982666,-0.0109939575,0.07312012,-0.04196167,0.047790527,-0.008964539,0.026748657,0.049072266,-0.0072250366,-0.041625977,0.015357971,0.03488159,0.014678955,0.038238525,0.013977051,-0.021270752,-0.010894775,0.07885742,-0.0063667297,-0.013671875,-0.00016951561,-0.0069885254,0.039855957,-0.017242432,-0.051330566,-0.03286743,-0.0034942627,-0.03387451,0.024932861,-0.012008667,0.031341553,-0.00055503845,-0.009338379,-0.023147583,-0.008201599,-0.032165527,0.019424438,-0.016723633,0.017181396,-0.028137207,-0.024169922,0.01889038,0.013252258,-0.014625549,0.0028648376,0.06072998,0.015686035,-0.0051879883,-0.025360107,-0.036834717,-0.010650635,-0.0063438416,0.026153564,0.01071167,0.01586914,0.045928955,-0.03643799,-0.01159668,0.015975952,0.010307312,0.043304443,0.00057315826,-0.007598877,-0.06604004,-0.047180176,-0.020751953,-0.044311523,0.03010559,0.014083862,-0.0062294006,0.06311035,0.006778717,-0.02507019,-0.020950317,0.009513855,-0.042816162,-0.00032925606,0.048187256,-0.0032997131,-0.024124146,0.015014648,-0.0069389343,0.0042495728,0.03741455,0.013465881,0.028884888,0.06286621,0.027893066,0.010551453,0.024551392,0.0018053055,0.015930176,0.010650635,-0.026992798,-0.019943237,-0.023223877,0.029968262,-0.019134521,-0.012916565,-0.06347656,0.04827881,0.036712646,0.07849121,0.014801025,0.0018997192,0.037353516,0.00033926964,0.0135650635,-0.010910034,-0.029647827,-0.035736084,-0.041534424,0.027038574,-0.008010864,-0.004257202,-0.0072669983,0.028533936,0.007259369,0.012107849,-0.030670166,0.037384033,-0.010246277,-0.009399414,0.025878906,0.015426636,0.043029785,0.059570312,-0.039276123,0.010292053,0.019592285,-0.046569824,-0.005722046,0.041107178,-0.007801056,-0.011192322,-0.051879883,-0.022735596,0.0029125214,-0.012962341,-0.04928589,-0.0032577515,-0.0021591187,0.015174866,0.021820068,-0.008178711,-0.01777649,-0.0070991516,-0.016052246,-0.040802002,-0.0007491112,-0.034179688,0.009811401,0.040893555,-0.023513794,0.014717102,0.0051612854,0.0011110306,-0.01637268,0.007221222,0.019561768,-0.008773804,-0.044677734,0.046051025,-0.0041046143,0.0064201355,0.004611969,0.027114868,0.024215698,0.028060913,0.045562744,0.01033783,-0.00919342,-0.06829834,0.015129089,-0.03967285,-0.000049591064,0.015022278,-0.036712646,0.0020046234,-0.002609253,-0.036102295,-0.023529053,0.0032348633,-0.025390625,0.0044784546,0.014549255,-0.022415161,-0.040924072,-0.060791016,-0.013572693,-0.0031032562,0.064941406,0.016296387,0.007045746,-0.062438965,-0.003145218,0.026626587,0.008895874,0.029464722,-0.015319824,-0.007320404,-0.019470215,-0.025939941,-0.020446777,-0.020187378,0.023895264,0.0028572083,-0.003692627,0.030776978,-0.00035524368,0.015602112,0.015655518,0.009727478,0.021224976,-0.024307251,0.000018656254,-0.00006198883,0.027160645,0.011207581,-0.020370483,-0.042419434,0.042938232,0.0019102097,0.040802002,-0.044128418,0.0027828217,-0.0033473969,0.0030765533,0.019424438,-0.014228821,-0.012252808,-0.013343811,-0.045074463,-0.061279297,0.043762207,-0.006290436,0.03338623,0.021484375,0.0065574646,0.030883789,-0.00957489,-0.0071868896,0.02607727,-0.014732361,0.0016794205,-0.023529053,-0.039001465,-0.017181396,-0.018737793,-0.028747559,0.031341553,-0.02078247,0.018753052,0.00843811,-0.02456665,0.01979065,-0.003194809,0.0024318695,0.016693115,0.0030498505,0.019317627,0.03933716,0.016296387,-0.04437256,0.022445679,0.0015134811,0.0028381348,-0.008529663,0.044647217,0.022247314,-0.016098022,-0.008270264,-0.012031555,-0.008674622,-0.022644043,0.0010194778,-0.003982544,0.0043525696,0.00053215027,-0.037475586,0.012321472,0.00844574,-0.034301758,-0.029464722,0.011405945,0.014450073,-0.036376953,0.017654419,0.026855469,0.056640625,-0.025314331,0.0024681091,0.004371643,0.041992188,0.036193848,0.0079956055,-0.013542175,0.021850586,-0.0099487305,0.013877869,0.0014457703,-0.015602112,0.014190674,0.00041103363,0.018859863,0.024765015,0.0029850006,-0.015640259,-0.03552246,-0.002325058,-0.01914978,-0.027709961,0.018447876,0.010719299,0.040130615,-0.023284912,0.018737793,0.008636475,-0.014122009,-0.025421143,-0.008460999,0.032989502,-0.009124756,-0.004562378,0.012130737,0.014503479,0.018707275,-0.06707764,-0.0060577393,0.0010604858,0.008415222,-0.0076408386,-0.04660034,-0.04055786,0.0049095154,0.044799805,0.009277344,0.018585205,0.03237915,-0.0024909973,0.0051651,0.030471802,-0.010650635,-0.011192322,-0.009063721,-0.061065674,-0.017623901,0.0023288727,0.006755829,-0.027893066,0.012268066,-0.012214661,-0.019836426,0.010749817,-0.007835388,-0.004623413,-0.019714355,0.0064697266,0.045318604,0.012992859,0.01890564,-0.011962891,-0.03262329,-0.010971069,0.017807007,0.021621704,-0.050048828,0.03652954,-0.016723633,-0.0013780594,0.0024986267,0.009765625,0.024505615,0.021514893,0.0141067505,0.034362793,-0.04446411,0.055145264,-0.024002075,0.02784729,0.004058838,-0.032470703,-0.012641907,-0.01966858,-0.011909485,0.041656494,-0.023788452,-0.011077881,-0.03475952,-0.034332275,-0.0146102905,-0.05441284,0.024230957,0.031799316,0.03439331,-0.018127441,-0.000082314014,-0.0022201538,0.0096588135,-0.009399414,0.009757996,-0.017730713,0.014709473,0.026748657,-0.0018396378,-0.023101807,-0.030899048,-0.0059051514,-0.0041923523,-0.05722046,-0.0552063,-0.00617218,0.010765076,-0.010910034,-0.0073051453,-0.025054932,-0.029632568,-0.0036029816,-0.04107666,0.010719299,-0.0034942627,0.017593384,-0.00093984604,-0.022155762,-0.0020942688,-0.00015747547,-0.0035133362,0.036376953,0.002166748,0.005393982,-0.04598999,0.010284424,0.018600464,0.020095825,-0.0043258667,-0.014411926,-0.01322937,-0.018218994,-0.04486084,-0.0036373138,-0.006919861,-0.009750366,-0.018722534,0.0035743713,-0.0541687,-0.0017223358,-0.034210205,-0.0061073303,0.015777588,0.0132369995,0.009017944,0.0021247864,0.02684021,-0.012191772,-0.028076172,-0.030563354,0.016189575,0.011070251,0.006626129,0.023254395,0.052978516,0.0039596558,-0.017059326,0.0046157837,0.0058135986,0.02029419,-0.02949524,0.017547607,-0.018112183,0.029312134,-0.01247406,-0.012542725,-0.04083252,-0.009643555,0.078308105,0.004753113,-0.021621704,-0.008178711,-0.011276245,0.016983032,0.039764404,-0.032714844,0.0026493073,-0.022354126,0.016326904,-0.021606445,-0.004562378,0.0045204163,0.016113281,-0.017211914,-0.052520752,-0.012527466,-0.011154175,-0.015777588,-0.06719971,-0.031585693,-0.072631836,0.004096985,-0.010009766,-0.030670166,0.0034503937,0.0059509277,-0.01109314,-0.089904785,-0.011146545,0.055511475,-0.0005092621,0.026382446,-0.0154418945,0.019226074,0.039978027,-0.033172607,-0.0055007935,0.026123047,-0.031982422,-0.016784668,-0.019210815,0.020492554,-0.013038635,-0.012481689,-0.0009241104,0.010627747,0.01902771,-0.011756897,0.012878418,-0.018844604,0.01953125,-0.013572693,0.013244629,-0.02003479,-0.02067566,0.04736328,-0.055847168,0.035980225,0.0070724487,-0.003921509,0.008850098,0.042388916,0.03768921,-0.034362793,-0.022964478,0.016479492,0.017074585,0.036071777,-0.017471313,0.056121826,0.010192871,-0.009140015,0.016296387,-0.016845703,-0.011154175,-0.029205322,-0.026992798,0.02168274,0.005432129,0.011260986,-0.021621704,-0.0040740967,0.018615723,0.0026130676,0.008911133,-0.0017747879,-0.028808594,-0.033081055,0.009475708,0.005844116,-0.0009908676,0.004600525,0.030181885,0.02015686,0.043518066,0.013671875,-0.024169922,0.0030498505,0.027160645,-0.016540527,0.0053634644,0.034118652,0.007259369,0.014137268,0.017288208,0.009338379,-0.053527832,-0.016403198,-0.018081665,-0.01852417,-0.009284973,-0.016433716,-0.016281128,-0.0140686035,0.0044059753,-0.0018014908,-0.039093018,0.005050659,-0.032196045,-0.026290894,-0.004535675,0.0011997223,0.026123047,0.00018572807,0.00065755844,0.004283905,-0.004951477,0.044769287,-0.0065231323,-0.0154418945,0.041015625,0.035583496,0.026184082,-0.025421143,-0.008331299,-0.017028809,-0.007499695,0.0021266937,-0.029464722,0.019607544,0.033233643,-0.021514893,0.0027809143,0.0016822815,0.027923584,-0.01953125,0.012290955,-0.010238647,0.014640808,-0.015731812,0.03765869,-0.048614502,0.023666382,0.015686035,0.0022068024,-0.006954193,-0.01335144,-0.029846191,0.024932861,-0.0054092407,-0.0017204285,0.044555664,0.0029754639,0.024505615,-0.023071289,-0.01701355,-0.005924225,-0.031341553,-0.021469116,0.013389587,-0.012908936,-0.00008684397,0.022018433,-0.038879395,0.04159546,-0.03768921,0.016220093,-0.0054779053,0.003835678,-0.0031547546,-0.018554688,-0.0066070557,-0.011604309,-0.010513306,-0.0014019012,-0.003566742,0.05041504,0.025863647,0.02645874,0.047821045,0.023834229,0.008781433,-0.037384033,-0.03543091,0.0023059845,-0.002166748,0.020141602,-0.013580322,0.046020508,0.03729248,0.003211975,0.043548584,0.03152466,0.040740967,-0.004386902,0.010818481,-0.023590088,0.015304565,-0.013069153,0.02204895,-0.0029830933,0.041046143,-0.025878906,0.016723633,0.025985718,0.022445679,-0.019012451,0.036254883,0.07305908,0.017547607,-0.003326416,0.040161133,-0.000025391579,-0.008682251,-0.007446289,-0.034851074,0.046142578,0.0077934265,0.04437256,0.046539307,0.017242432,-0.0030918121,0.029754639,-0.026123047,-0.017028809,0.057647705,0.02027893,-0.028427124,-0.017593384,-0.010803223,0.010932922,-0.05041504,-0.019836426,0.014923096,-0.012313843,0.011703491,-0.0044822693,-0.0037326813,-0.011795044,0.0063323975,0.017044067,0.015701294,-0.011955261,0.025924683,0.029464722,0.002544403,0.020584106,0.0049819946,0.019012451,-0.016113281,-0.033233643,0.023544312,0.027450562,-0.0037631989,-0.010772705,0.030151367,0.0010995865,0.040527344,0.040863037,-0.025283813,0.0008382797,0.03591919,0.010604858,-0.0048713684,0.05606079,0.031921387,0.019226074,0.043060303,0.0362854,0.035308838,-0.033966064,0.027816772,-0.0008420944,-0.002544403,-0.018188477,-0.0021362305,0.0052986145,-0.012367249,0.020889282,-0.002325058,-0.018127441,0.018737793,0.0234375,-0.002696991,-0.013893127,-0.010551453,0.009140015,-0.023452759,0.0011444092,0.01940918,-0.012496948,0.035095215,0.0126953125,0.02281189,-0.017105103,0.036315918,0.0044288635,-0.0040626526,-0.002090454,0.028640747,-0.04525757,0.0014314651,-0.00415802,0.0066337585,-0.05206299,0.010032654,0.01449585,-0.0071525574,0.01512146,0.01663208,-0.008262634,-0.008338928,0.03302002,0.011871338,-0.002904892,-0.0071258545,-0.023376465,0.02609253,0.04272461,0.0030136108,0.006866455,-0.022033691,0.0015659332,0.0058631897,-0.0046043396,-0.0025138855,-0.0038890839,-0.009284973,-0.015449524,0.030883789,0.034576416,0.014663696,0.049926758,-0.015197754,-0.009567261,0.0036964417,0.03793335,0.014602661,0.0048217773,-0.007801056,0.01751709,-0.022323608,0.0496521,0.047912598,0.0063323975,0.034484863,0.00024747849,-0.018112183,0.009185791,-0.010169983,0.03173828,-0.00945282,0.0006299019,0.0032749176,0.030639648,-0.019882202,-0.032714844,0.0040245056,-0.02406311,-0.024002075,-0.008804321,0.011680603,0.00012898445,0.027572632,0.043151855,0.022003174,-0.012397766,0.060302734,-0.012451172,0.04751587,0.009300232,-0.009399414,0.048858643,0.027191162,0.043060303,0.014373779,0.0077590942,-0.036743164,0.021148682,0.035369873,0.02520752,0.010276794,0.0036640167,-0.0128479,0.034088135,-0.013061523,0.034973145,-0.005252838,-0.0026245117,0.014175415,-0.0024280548,-0.010154724,-0.008232117,-0.00049448013,0.010246277,0.049468994,-0.021148682,-0.012626648,-0.02154541,-0.00491333,0.024642944,-0.0020332336,-0.0022029877,-0.01159668,-0.016921997,0.01637268,-0.035095215,-0.022735596,0.013259888,0.025161743,-0.04425049,-0.0090789795,0.006378174,0.017944336,-0.027389526,0.02859497,0.020126343,-0.014961243,0.003730774,0.047302246,-0.008049011,0.02746582,-0.010894775,0.03967285,0.029388428,0.011024475,-0.016616821,-0.0025463104,0.015792847,-0.01612854,0.011260986,0.037872314,-0.023468018,-0.0040779114,-0.0066986084,-0.0078125,0.0039482117,0.0040397644,-0.009925842,0.008331299,-0.0034732819,-0.0054740906,0.009185791,0.0058784485,-0.0076789856,0.0038433075,0.0010843277,-0.0093688965,0.014175415,0.04135132,0.020019531,-0.03250122,-0.011795044,0.008216858,0.006088257,-0.021194458,-0.011459351,-0.0055236816,-0.038635254,0.0071487427,0.010368347,0.011779785,0.012214661,-0.029281616,-0.012214661,0.020385742,0.006465912,0.017211914,0.009147644,0.002298355,0.016662598,-0.005569458,-0.0014762878,-0.012054443,-0.003145218,0.008079529,0.024765015,-0.01234436,-0.023544312,0.01637268,-0.0030937195,0.019073486,0.005794525,-0.006839752,0.011741638,-0.023773193,-0.0031013489,0.0107040405,0.014533997,-0.012779236,-0.016983032,-0.0034999847,0.023223877,0.05218506,-0.005924225,-0.0115356445,0.02293396,0.022094727,0.026428223,0.036132812,0.002796173,0.037994385,0.03074646,-0.01828003,-0.014282227,0.010314941,-0.0025119781,-0.026611328,0.012817383,-0.004699707,-0.015106201,0.02557373,0.025665283,0.0037631989,-0.026504517,-0.007534027,-0.01309967,-0.019073486,0.006095886,-0.0027065277,0.017807007,-0.020324707,-0.012580872,0.0102005005,-0.026397705,-0.035583496,-0.014190674,-0.00233078,-0.01121521,-0.05328369,0.006576538,-0.028274536,0.010093689,-0.02784729,0.004371643,-0.0077400208,0.006324768,-0.012588501,-0.016403198,-0.004547119,0.027572632,0.015197754,0.005428314,0.021820068,-0.025131226,-0.022262573,-0.023849487,0.010643005,-0.0211792,0.023330688,-0.0058021545,0.028808594,0.023651123,-0.007896423,-0.0056877136,-0.009590149,-0.007408142,-0.008956909,-0.011886597,-0.02053833,0.022888184,0.019485474,-0.011306763,-0.009010315,0.03994751,-0.02746582,-0.013298035,0.024169922,0.039733887,0.0058517456,0.037994385,-0.020339966,-0.00566864,-0.019439697,-0.005012512,-0.017227173,0.0011358261,-0.00024604797,0.01889038,-0.0033359528,0.011657715,0.02130127,-0.001405716,0.0064048767,0.03237915,0.0012111664,0.003419876,0.031066895,0.012756348,0.007873535,-0.018615723,-0.011642456,0.022857666,0.042266846,0.0010404587,0.008880615,-0.014923096,0.01008606,-0.012512207,0.010055542,0.01928711,-0.028274536,-0.055847168,-0.010482788,-0.031951904,0.0231781,-0.008232117,0.009185791,-0.010528564,0.016098022,-0.009521484,-0.026351929,-0.029968262,0.021972656,0.008483887,-0.011695862,-0.007949829,0.011787415,0.015052795,-0.037231445,0.0025634766,-0.03778076,-0.03353882,-0.015022278,-0.013923645,0.02217102,0.0007658005,-0.01260376,-0.003753662,-0.018005371,0.0018186569,0.016586304,0.019500732,-0.01184845,0.00037670135,0.026748657,0.024902344,-0.017852783,0.028823853,-0.004055023,0.009254456,0.012535095,-0.00566864,0.011016846,-0.020858765,0.02935791,-0.0090408325,0.00042128563,0.031219482,-0.003042221,0.011665344,-0.03555298,-0.0005784035,0.0028572083,-0.0032958984,0.0440979,-0.013961792,-0.010292053,0.012901306,-0.02558899,-0.031707764,0.0007581711,0.020812988,0.024002075,-0.0087509155,0.053222656,-0.010749817,-0.0129776,0.011795044,0.0052261353,-0.017669678,0.0014019012,0.02835083,0.01071167,0.0028839111,-0.0029773712,-0.01424408,-0.028457642,-0.0072402954,0.02243042,0.0016794205,-0.013160706,0.024795532,0.019042969,0.04333496,-0.012123108,0.02255249,0.01727295,0.012077332,0.025924683,0.006690979,0.044952393,-0.0057144165,-0.029006958,-0.005340576,0.0018520355,-0.02230835,0.0067443848,0.004009247,0.006591797,-0.04559326,0.0118255615,0.002752304,0.02746582,-0.011154175,0.010574341,-0.025253296,-0.007545471,-0.042297363,-0.0026893616,-0.029968262,0.0027503967,0.040771484,0.0025043488,0.034606934,0.0008792877,-0.0256958,0.016555786,0.052612305,-0.000110030174,-0.031555176,-0.022415161,0.012199402,0.0013895035,0.010353088,0.005710602,-0.016189575,-0.021118164,-0.00029468536,-0.0064086914,0.009803772,-0.0043640137,0.017593384,0.011405945,-0.00085926056,-0.017303467,0.027420044,-0.009376526,-0.0016374588,0.0045204163,0.0015974045,0.03353882,0.03262329,-0.0104522705,0.01966858,0.01550293,-0.048736572,0.0597229,-0.0039978027,0.034484863,-0.011802673,0.010894775,-0.032287598,-0.034118652,-0.018112183,-0.0015096664],"createdAt":"2026-04-18T19:27:22.786Z","updatedAt":"2026-04-22T16:32:16.035Z","lastSeenAt":"2026-04-22T16:32:16.035Z","tsv":"'/api':157 '/api/v1/transactions/99':96,188 '/docs':156 '/pricing':158 '/readme':160 '/request':13,28 '0.02':12,27,64,114,116 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':148 '1':131 '16':196 '20':108 'Base network API' 'USDC micropayment API' 'access':102 'account':76 'actual':190 'address':143 'ai-inference' 'ai/ml':49 'analyt':48 'api':5,20,37,74,101,198 'attach':84 'base':8,23,71,110,150 'base-network' 'broad':42 'call':4,19 'caller':82 'captur':129 'carri':104 'categori':199 'challeng':126 'classification' 'confirm':134 'connect':166 'consist':117 'content':172 'contract':147 'crypto API payments' 'crypto-data' 'data':47,52 'data-analytics' 'demo':227 'descript':184 'detail':203 'differ':197 'direct':141 'document':151,181 'embeddings' 'enabl':36 'endpoint':45,57,94,136,189,220 'exact':133 'extrem':153 'finance-data' 'finance/web3':51 'format':209 'geocoding' 'header':88 'infer':50 'input':205 'key':75 'land':193 'limit':79 'list':98,195 'live':138 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':106 'may':224 'network':9,24,72 'no-api-key' 'offer':40 'openapi':176 'page':161,194 'paramet':206 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,139 'per':3,18,61 'placehold':229 'platform':6,21,38 'premium':100 'price':123 'prompt':168 'provid':201 'purpos':215 'rate':78 'render':163 'request':62,91 'request/response':179 'requir':81 'respons':208 'return':191 'schema':180 'scheme':132 'sentiment-analysis' 'serverless API billing' 'servic':55 'set':43 'settl':66 'simpli':83 'site':121 'site-wid':120 'span':46 'spars':154 'spec':177 'specif':93,218 'success':128 'text-summarization' 'transactions/99':219 'unclear':222 'unit':111 'usdc':15,30,68,113,115,146 'usdc-settlement' 'use':145 'util':54 'utility-services' 'version':130 'via':10,25 'wallet':167 'wide':122 'x402':11,26,35,86,125 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"88a73a09-bf12-4423-9eb7-405491db509f","listingId":"1a6b01ec-e469-4bd5-8432-b13ccc3471da","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/transactions/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:22.786Z"}],"sources":[{"listingId":"1a6b01ec-e469-4bd5-8432-b13ccc3471da","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:22.786Z","lastSeenAt":"2026-04-22T16:32:16.035Z"}],"details":{"listingId":"1a6b01ec-e469-4bd5-8432-b13ccc3471da","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/99 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 version 1 challenge, scheme 'exact', on Base network with USDC","source_url":"https://lowpaymentfee.com/api/v1/transactions/99"},{"claim":"maxAmountRequired is 20000 base units of USDC (0.02 USD) with asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/99"},{"claim":"Site lists 16 API endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion utilities with micropayment billing","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["AI agents that need on-demand API access without account registration","Developers prototyping with low-commitment, pay-as-you-go endpoints","Web3-native applications that can settle payments in USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where per-request crypto settlement adds overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.277Z"},"updatedAt":"2026-04-22T16:32:16.035Z"}}