{"id":"ece63e6e-785a-46a2-b2af-b93c586124bd","shortId":"fhXv2M","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/74` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. The platform claims no rate limits and instant access.\n\nImportant caveat: the specific endpoint probed (`/api/v1/keys/74`) does not clearly map to any of the named API categories on the landing page. Its description is simply \"Premium API Access,\" and no documentation, OpenAPI schema, or example request/response payloads are available. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation it is impossible to confirm what this endpoint actually returns or what input it expects beyond an HTTP POST with a JSON content type.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation available — /api, /pricing, and /README pages returned only 'Connect wallet' with no content","The endpoint path /api/v1/keys/74 does not match any of the named endpoints on the landing page; its actual functionality is unknown","No OpenAPI or output schema beyond basic HTTP method info","No example request or response payloads available to verify behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/74","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/keys/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge), but there is no OpenAPI schema, no documentation, no example requests or responses, and the /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. The endpoint name 'Premium API Access' is generic and does not describe what data or functionality it provides. 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":"2026-04-21T22:23:55.195Z","embedding":[-0.028808594,-0.025299072,0.047088623,0.022018433,0.018615723,-0.030578613,-0.030776978,0.038970947,0.07171631,-0.06781006,0.027069092,-0.040039062,-0.024627686,-0.033935547,-0.0317688,0.0057640076,-0.012397766,0.0070266724,-0.044189453,0.036224365,0.0116119385,-0.022460938,-0.02130127,0.030578613,0.0043029785,-0.012893677,-0.005088806,-0.030166626,-0.012588501,-0.032287598,0.05947876,-0.022109985,-0.00920105,0.0090408325,-0.0209198,-0.014831543,-0.008110046,0.027252197,0.02684021,-0.000310421,-0.015289307,-0.052703857,-0.010856628,-0.020706177,-0.046081543,-0.0066452026,0.004634857,-0.022323608,-0.0063552856,0.003255844,-0.039001465,-0.010887146,-0.00945282,0.003932953,0.009590149,0.008682251,0.00011509657,-0.019332886,0.012664795,0.011985779,0.009819031,-0.057891846,-0.018661499,0.0071907043,-0.006374359,0.04977417,-0.013694763,0.047912598,0.00818634,0.058807373,0.03665161,0.03829956,0.023132324,0.017089844,-0.004508972,0.00024104118,-0.0071640015,0.07672119,-0.019454956,-0.014297485,-0.010871887,-0.005962372,-0.042663574,-0.010528564,-0.0090408325,-0.04663086,-0.022613525,0.0027236938,-0.016357422,0.029281616,-0.068603516,-0.03616333,-0.005958557,0.014732361,0.006904602,-0.006587982,-0.0018367767,0.018325806,-0.010910034,0.025283813,0.008544922,-0.04107666,0.010971069,0.007320404,0.04852295,0.039794922,0.018096924,0.01637268,0.01512146,-0.019088745,-0.054779053,0.009590149,-0.029647827,-0.0005159378,0.014297485,0.009552002,-0.020309448,0.017669678,-0.036621094,-0.000936985,-0.052490234,0.043762207,0.030395508,0.0031547546,0.00831604,-0.050354004,-0.016601562,0.018859863,-0.019638062,-0.026611328,0.008911133,0.009185791,0.033325195,-0.0060806274,-0.032714844,-0.0010719299,-0.008659363,-0.026138306,-0.03994751,-0.03488159,0.03050232,-0.024246216,0.028060913,0.030059814,-0.1126709,-0.0093307495,-0.042755127,0.009399414,-0.029281616,-0.00021839142,-0.0066947937,0.024246216,-0.014640808,-0.017837524,-0.0107421875,-0.018051147,0.012763977,0.029953003,-0.02444458,0.052856445,-0.025405884,0.042541504,0.029281616,0.012504578,0.029220581,0.028869629,-0.0020694733,-0.095214844,-0.08642578,-0.018096924,-0.008651733,-0.019638062,-0.024246216,0.01222229,-0.014770508,-0.060424805,-0.0128479,-0.013885498,0.005256653,-0.03765869,-0.009132385,-0.023468018,0.006465912,-0.015640259,-0.05569458,-0.006801605,-0.025680542,0.061553955,0.012878418,0.028427124,0.02772522,-0.019989014,0.06665039,0.03375244,-0.02218628,-0.028182983,0.010559082,-0.02015686,0.014511108,-0.00522995,-0.006000519,-0.054870605,0.048339844,0.06542969,0.014251709,-0.007545471,-0.017028809,-0.053741455,-0.03729248,-0.039916992,0.0184021,0.014625549,0.004142761,0.041229248,-0.044403076,-0.034423828,-0.0141067505,0.010696411,0.0034294128,0.07672119,0.003332138,-0.010467529,0.011367798,0.025619507,-0.04937744,0.033447266,0.03778076,0.0053215027,-0.018661499,-0.024734497,0.025390625,0.04071045,-0.013626099,0.016448975,-0.026138306,0.031021118,-0.009399414,-0.00068616867,0.018707275,-0.013809204,-0.019302368,-0.035003662,-0.04196167,0.02116394,-0.005317688,-0.02420044,-0.028808594,-0.08728027,0.05117798,0.0259552,0.041290283,-0.011894226,0.010238647,-0.020019531,-0.000031769276,-0.06463623,0.057037354,0.08215332,0.0020694733,-0.014770508,0.02053833,0.003200531,-0.015777588,0.011116028,-0.013420105,-0.036956787,-0.019683838,0.007221222,-0.05895996,-0.00059843063,0.014862061,0.035003662,0.058502197,-0.011077881,-0.033355713,-0.007785797,-0.013572693,-0.019241333,-0.03302002,-0.0003709793,-0.002937317,-0.0036735535,0.03652954,-0.0013523102,0.02041626,-0.0072021484,0.012313843,-0.0014734268,-0.0030117035,-0.01966858,-0.02180481,0.014846802,0.010498047,-0.052001953,0.015235901,-0.0043792725,0.07019043,-0.038269043,0.03125,-0.010437012,0.011260986,0.038513184,-0.005317688,-0.039978027,0.0071487427,0.026428223,0.011505127,0.041412354,0.0029277802,-0.035736084,-0.009529114,0.070739746,-0.0032730103,-0.0126571655,-0.0056114197,0.00023984909,0.024887085,-0.015090942,-0.05834961,-0.025222778,-0.0019187927,-0.034454346,0.011047363,-0.024215698,0.019485474,-0.010414124,0.001367569,-0.024246216,0.0023040771,-0.024932861,0.045043945,-0.027954102,0.0017518997,-0.0146484375,-0.031219482,0.011009216,0.028808594,-0.007713318,-0.0075912476,0.030838013,0.03237915,-0.018325806,-0.033203125,-0.015472412,-0.014640808,-0.0048561096,0.026306152,0.018096924,0.02684021,0.0413208,-0.026184082,0.009994507,0.030807495,0.016082764,0.037384033,-0.014572144,0.010787964,-0.07080078,-0.048187256,-0.021987915,-0.023330688,0.019866943,0.017288208,-0.0012702942,0.048858643,0.005683899,-0.031311035,-0.047821045,0.026351929,-0.036895752,0.0060806274,0.035491943,-0.013641357,-0.031341553,-0.0019140244,-0.00844574,0.008712769,0.04776001,0.0137786865,0.019607544,0.07550049,0.042266846,-0.004650116,0.025222778,-0.0003836155,0.029876709,0.014274597,-0.015258789,-0.031799316,-0.0021209717,0.031829834,-0.017089844,-0.026229858,-0.07745361,0.07208252,0.044830322,0.073791504,0.008644104,0.00579834,0.041931152,-0.02468872,0.013534546,-0.021408081,-0.003578186,-0.013259888,-0.047912598,0.036132812,-0.01876831,-0.0023212433,-0.036376953,0.05267334,-0.00497818,0.022064209,-0.031433105,0.050323486,-0.004096985,0.013832092,0.0038223267,0.004928589,0.039154053,0.07006836,-0.04827881,0.02017212,0.030578613,-0.041625977,0.020187378,0.049102783,-0.016220093,-0.015930176,-0.06842041,-0.02128601,-0.0076293945,-0.003780365,-0.056427002,-0.004886627,0.00687027,0.010360718,0.026184082,-0.014694214,-0.012519836,-0.012969971,-0.03289795,-0.056671143,0.0058021545,-0.048614502,-0.0087890625,0.042266846,-0.030395508,-0.015701294,0.0073013306,-0.018676758,-0.013702393,0.0074501038,0.03793335,-0.0064353943,-0.042388916,0.03778076,0.012626648,0.0011005402,0.0032577515,0.035461426,0.017318726,0.024841309,0.046722412,0.009094238,-0.019256592,-0.06982422,0.038085938,-0.05996704,0.009017944,0.012619019,-0.023864746,0.004512787,-0.01096344,-0.043273926,-0.034088135,0.0012292862,-0.042022705,0.006450653,0.01676941,-0.027038574,-0.026168823,-0.06530762,-0.01210022,0.0023269653,0.07183838,0.021652222,0.00032305717,-0.055114746,0.0014076233,0.011520386,0.00039601326,0.045898438,-0.014328003,-0.02357483,-0.013252258,-0.026489258,-0.007713318,-0.016540527,0.026428223,-0.00085258484,-0.015274048,0.02456665,0.017486572,0.009231567,0.013938904,0.00655365,0.0104599,-0.029922485,-0.0070648193,-0.0033359528,0.041015625,0.004497528,-0.0107421875,-0.035339355,0.042022705,0.020950317,0.026733398,-0.029724121,-0.005710602,-0.012306213,0.007709503,0.022399902,-0.015991211,-0.020812988,-0.0032997131,-0.05419922,-0.043395996,0.03781128,-0.029586792,0.026550293,0.013389587,0.0070991516,0.012863159,-0.011276245,0.012535095,0.024108887,-0.035247803,-0.0051116943,-0.012916565,-0.026763916,-0.021942139,0.008171082,-0.020339966,0.028213501,-0.01449585,0.018463135,0.0017604828,-0.020217896,0.026733398,0.017059326,-0.004722595,0.023788452,0.003540039,0.022415161,0.049987793,0.0059051514,-0.03756714,0.03289795,-0.0055274963,0.01928711,-0.0027008057,0.035339355,0.040039062,-0.012084961,-0.00541687,0.0034008026,-0.012634277,-0.012649536,-0.00075769424,0.0065231323,0.014587402,-0.01739502,-0.046325684,0.022247314,0.01247406,-0.026916504,-0.02142334,0.025314331,0.0060691833,-0.034484863,0.024932861,0.02267456,0.059448242,-0.03201294,0.009613037,0.013244629,0.03463745,0.024612427,-0.0052833557,-0.00038409233,0.019424438,-0.024795532,-0.000705719,-0.0067596436,0.0107803345,0.028182983,0.003917694,0.020446777,0.02720642,0.015853882,-0.020446777,-0.034820557,0.011154175,-0.021224976,-0.023101807,0.014122009,0.023651123,0.02331543,-0.02394104,0.018920898,0.014129639,-0.016967773,-0.004135132,-0.005607605,0.033935547,-0.014831543,-0.02407837,0.021896362,0.0015573502,0.024261475,-0.04333496,-0.003835678,0.01374054,0.02432251,-0.032196045,-0.0418396,-0.045562744,0.009735107,0.03274536,0.006576538,0.019363403,0.043884277,0.004840851,0.0016965866,0.030654907,0.006729126,-0.01751709,-0.012481689,-0.03289795,-0.026306152,-0.0030117035,0.001627922,-0.036315918,0.016952515,-0.0051612854,-0.031951904,0.00484848,-0.013587952,-0.0041122437,-0.0025672913,0.0030841827,0.03387451,0.009933472,0.018737793,-0.016616821,-0.035705566,-0.006450653,-0.0045318604,0.017684937,-0.053131104,0.0289917,-0.010139465,-0.018814087,-0.0024795532,0.017486572,0.017227173,0.035980225,0.009437561,0.032287598,-0.056640625,0.048461914,-0.039001465,0.016342163,0.0011396408,-0.037719727,-0.0024681091,-0.029129028,-0.023757935,0.040008545,-0.019073486,-0.012481689,-0.03842163,-0.020385742,-0.0069122314,-0.055541992,0.021133423,0.03829956,0.03805542,-0.026565552,0.008934021,0.006385803,0.005886078,-0.016479492,-0.0016040802,-0.0040740967,0.009567261,0.024002075,0.0007429123,-0.020721436,-0.029251099,-0.023620605,-0.01260376,-0.039031982,-0.046447754,-0.002407074,0.006717682,0.00055933,-0.009361267,-0.028167725,-0.03225708,0.002752304,-0.039489746,0.0054016113,-0.009162903,0.013847351,-0.0035362244,-0.019195557,0.017227173,0.02746582,-0.029922485,0.039611816,0.004863739,0.0005970001,-0.027542114,0.020980835,0.028915405,0.004585266,0.0013523102,-0.010795593,-0.008773804,-0.016983032,-0.049560547,-0.0015296936,-0.00008714199,-0.011886597,-0.0093307495,0.0040130615,-0.051483154,-0.0055618286,-0.011131287,-0.0023231506,0.037902832,0.026687622,0.010101318,-0.0055389404,0.013259888,-0.0076293945,-0.0155181885,-0.02758789,0.022705078,0.010437012,-0.0058670044,0.028656006,0.044189453,0.00907135,-0.014976501,0.010482788,0.013290405,0.02619934,-0.01763916,0.011131287,-0.018249512,0.00969696,-0.008155823,-0.020095825,-0.037078857,-0.0013942719,0.08026123,0.0005350113,-0.013084412,-0.010002136,-0.012535095,0.012329102,0.021911621,-0.054351807,0.0021362305,-0.036987305,0.011978149,-0.022247314,0.020339966,-0.007282257,0.0135650635,-0.01335144,-0.05444336,-0.0072402954,0.004634857,-0.013900757,-0.06774902,-0.01725769,-0.05307007,0.002199173,-0.0057678223,-0.027908325,0.00027871132,-0.00096845627,-0.009346008,-0.07897949,0.010917664,0.041778564,0.01222229,0.022872925,0.0018377304,0.020507812,0.020721436,-0.02394104,-0.010955811,0.031066895,-0.023117065,-0.01399231,-0.01663208,0.012214661,-0.012336731,-0.014389038,0.019851685,-0.004470825,0.021255493,0.0009794235,0.011001587,-0.006099701,0.019012451,-0.026397705,0.01600647,-0.0066947937,-0.0042648315,0.036010742,-0.03994751,0.025939941,0.022064209,0.005317688,0.00920105,0.025817871,0.042144775,-0.037200928,-0.015777588,0.02482605,0.0033512115,0.030807495,-0.026947021,0.043151855,0.023666382,-0.01977539,0.023117065,-0.0077590942,-0.010986328,-0.049560547,-0.022094727,0.028762817,0.0008506775,0.013442993,-0.024658203,0.007534027,0.030395508,-0.013046265,0.011314392,-0.014663696,-0.022857666,-0.027557373,-0.010650635,-0.0015869141,0.008712769,0.00010949373,0.02268982,0.0146102905,0.02696228,0.012565613,-0.011108398,0.009757996,0.020858765,-0.015701294,-0.00011861324,0.024719238,0.012702942,0.009170532,0.024612427,0.00434494,-0.045776367,0.0012016296,-0.0259552,-0.018554688,0.0067825317,-0.005176544,-0.014732361,-0.0010356903,0.010353088,-0.004486084,-0.032562256,0.00459671,-0.03201294,-0.027511597,-0.0018835068,-0.006248474,0.024734497,0.010147095,0.011169434,0.017929077,0.0052337646,0.05859375,0.0014619827,-0.0047073364,0.023544312,0.032592773,0.021148682,-0.032806396,-0.0070533752,-0.012390137,0.011375427,0.00642395,-0.041107178,0.017150879,0.038146973,-0.025543213,0.007972717,0.010528564,0.022644043,-0.020004272,0.0032863617,-0.005088806,0.022720337,-0.017227173,0.032043457,-0.039398193,0.01751709,0.010139465,0.016189575,-0.013648987,-0.01928711,-0.031341553,0.013420105,-0.0027065277,-0.018173218,0.04272461,-0.0033779144,0.023880005,-0.00932312,-0.009933472,0.01084137,-0.030593872,-0.01739502,0.036193848,-0.005874634,-0.0017337799,0.0073776245,-0.022720337,0.039398193,-0.025756836,0.0033016205,0.012809753,-0.0056610107,-0.014213562,-0.012664795,-0.010757446,0.0020828247,-0.014274597,-0.0071487427,0.0018167496,0.046722412,0.029388428,0.035736084,0.05053711,-0.0004646778,0.00056123734,-0.033416748,-0.015853882,0.003332138,-0.018630981,0.029846191,-0.009094238,0.04748535,0.039489746,0.0007200241,0.031021118,0.03253174,0.025939941,-0.0017127991,0.008872986,-0.016113281,0.016708374,-0.0045928955,0.02722168,-0.0013980865,0.0385437,-0.025238037,0.018341064,0.01713562,0.023101807,-0.035339355,0.038208008,0.06451416,0.021530151,-0.012390137,0.027801514,0.004524231,-0.012229919,-0.016921997,-0.023605347,0.06311035,0.0090408325,0.050933838,0.050872803,0.0039100647,0.00894928,0.020385742,-0.02583313,-0.020477295,0.07543945,0.020858765,-0.014953613,-0.010391235,-0.005382538,0.0007686615,-0.041229248,-0.03378296,0.01689148,-0.013755798,0.0060272217,-0.023422241,0.0032291412,-0.00774765,0.013961792,0.01689148,0.011009216,-0.009277344,0.03314209,0.027359009,0.004753113,0.037597656,-0.0027179718,0.03543091,-0.021469116,-0.03463745,0.0051116943,0.0113220215,-0.004299164,-0.008201599,0.022537231,-0.00092315674,0.039978027,0.04284668,-0.016784668,0.018569946,0.038330078,0.011787415,-0.00051259995,0.05657959,0.04486084,0.012077332,0.035491943,0.037475586,0.040985107,-0.03189087,0.0112838745,0.0036754608,-0.008552551,-0.014961243,-0.018966675,0.00029277802,-0.011177063,0.015655518,-0.008834839,-0.018981934,0.024154663,0.032806396,-0.0029621124,0.0063705444,-0.0021686554,-0.00095129013,-0.010574341,-0.0030517578,0.017150879,-0.02130127,0.03024292,0.022766113,0.030426025,-0.019119263,0.02078247,0.004699707,-0.014518738,-0.008575439,0.020645142,-0.032348633,0.011352539,0.0015954971,0.0022583008,-0.054138184,0.020523071,0.02154541,-0.00038051605,0.02961731,0.014198303,-0.009391785,0.0022697449,-0.0018377304,-0.00094890594,-0.0052223206,-0.014442444,-0.02293396,0.036895752,0.034088135,0.007331848,0.01966858,-0.01725769,-0.0048446655,0.0060272217,-0.00069999695,-0.0049819946,-0.015701294,-0.012832642,-0.02709961,0.01247406,0.033966064,0.021484375,0.055755615,-0.011260986,-0.01109314,0.009895325,0.034210205,0.0074424744,0.015930176,-0.0031604767,0.02027893,-0.007858276,0.037384033,0.04147339,0.014091492,0.03817749,-0.024597168,-0.015129089,0.009109497,-0.004009247,0.023269653,-0.014251709,0.008407593,-0.004928589,0.02027893,-0.014442444,-0.046447754,0.0126953125,-0.017150879,-0.014160156,-0.022842407,0.0022506714,0.008392334,0.029693604,0.04296875,0.023880005,-0.024139404,0.060577393,-0.00440979,0.057037354,-0.0073127747,-0.025482178,0.04824829,0.028060913,0.027664185,0.013954163,0.021911621,-0.030700684,0.011260986,0.049743652,0.033721924,0.005870819,-0.0018310547,-0.008934021,0.032226562,0.009460449,0.031341553,-0.012626648,-0.007183075,0.017471313,-0.003162384,-0.0110321045,-0.003921509,-0.00019919872,-0.004306793,0.039276123,-0.035339355,-0.010421753,-0.026000977,-0.0146102905,0.027816772,-0.009857178,0.005756378,-0.01687622,-0.035827637,0.014404297,-0.030426025,-0.016921997,0.0003643036,0.020736694,-0.03451538,-0.014091492,0.0054359436,0.017349243,-0.018310547,0.025482178,0.026443481,-0.0042877197,0.0075149536,0.0413208,-0.015838623,0.034820557,-0.0099487305,0.012825012,0.03665161,0.0038642883,-0.012184143,-0.0042877197,0.012649536,-0.01399231,0.016738892,0.032714844,-0.015258789,-0.00026106834,0.00083875656,-0.010391235,-0.0061912537,0.0024223328,-0.00038957596,0.0063934326,-0.0020332336,-0.001540184,-0.012382507,0.0020637512,0.00818634,-0.0019721985,-0.032592773,-0.017059326,0.019515991,0.030853271,0.02218628,-0.03817749,-0.0031929016,0.0012369156,0.010238647,-0.014625549,-0.021469116,-0.011993408,-0.039794922,0.016311646,0.021743774,0.0069770813,0.017196655,-0.024749756,-0.0012254715,0.018478394,0.0018463135,0.004005432,0.011352539,-0.015235901,0.007774353,-0.008720398,-0.016601562,-0.0060806274,-0.016159058,0.01852417,0.023498535,-0.006351471,-0.028060913,0.02784729,-0.006549835,0.023269653,-0.0011005402,-0.016311646,0.026489258,-0.017150879,-0.008598328,0.0043754578,0.023895264,-0.023742676,-0.006793976,-0.014961243,0.028518677,0.046295166,-0.008041382,-0.00894165,0.025421143,0.010177612,0.021133423,0.042144775,0.016418457,0.03363037,0.029388428,-0.015701294,-0.021743774,0.011550903,-0.004917145,-0.018676758,0.013328552,-0.0076293945,-0.02609253,0.026870728,0.0057373047,-0.004512787,-0.024307251,-0.015014648,-0.0047035217,-0.012039185,0.024780273,-0.008132935,0.02305603,-0.0129776,-0.010009766,-0.010528564,-0.00831604,-0.053985596,-0.02947998,0.0074043274,-0.0027599335,-0.060058594,0.002401352,-0.038391113,0.018951416,-0.015167236,-0.016067505,-0.004928589,0.031799316,-0.0069351196,0.009483337,-0.002620697,0.025283813,0.017303467,0.011909485,0.024871826,-0.022003174,-0.028335571,-0.01512146,0.01576233,-0.008094788,0.01574707,0.010261536,0.041168213,0.022033691,-0.005302429,-0.00035881996,-0.012054443,-0.009254456,-0.011299133,-0.012664795,-0.019058228,0.015548706,0.018249512,-0.0079193115,-0.00868988,0.03652954,-0.030212402,-0.008369446,0.03253174,0.053009033,0.0056152344,0.02758789,-0.017715454,-0.008033752,-0.0049209595,0.0025177002,-0.014564514,0.015129089,0.019485474,0.0005660057,-0.0006790161,0.006275177,0.0042419434,-0.013572693,-0.0023975372,0.014160156,0.006690979,-0.0076179504,0.040924072,0.016448975,0.017456055,-0.020706177,-0.017318726,0.020187378,0.045013428,0.022125244,0.014472961,0.00066137314,0.008407593,-0.012573242,0.010940552,0.0032157898,-0.020523071,-0.03062439,-0.025985718,-0.024047852,0.014831543,0.0016078949,0.01725769,-0.0045204163,0.021331787,-0.016403198,-0.03024292,-0.016677856,0.023956299,0.0090408325,-0.01687622,-0.030593872,0.0043678284,0.010551453,-0.026275635,-0.0036373138,-0.030853271,-0.035308838,0.0044517517,-0.020721436,0.015625,0.009307861,-0.0017547607,-0.0028934479,-0.008171082,0.007041931,-0.008354187,0.033081055,-0.014823914,0.0029773712,0.01335144,0.008575439,-0.013938904,0.016494751,0.000116467476,-0.0010766983,0.017929077,-0.01499176,0.01576233,-0.011398315,0.034454346,-0.0050239563,-0.004699707,0.039855957,-0.0048294067,0.0064735413,-0.030517578,0.010559082,0.002494812,-0.0004298687,0.051483154,-0.024002075,-0.032318115,0.0007829666,-0.017440796,-0.018936157,-0.004470825,0.022979736,0.037078857,-0.012756348,0.047668457,-0.0057525635,0.008308411,0.016189575,0.020339966,-0.010612488,-0.0032482147,0.031036377,0.009231567,-0.0049934387,-0.0037631989,-0.011245728,-0.037353516,-0.012313843,0.015586853,-0.0004131794,-0.008422852,0.019226074,0.008384705,0.042175293,-0.0028705597,0.009643555,0.016403198,0.0051956177,0.029403687,-0.0009651184,0.043914795,-0.007106781,-0.025970459,-0.0023384094,0.00605011,-0.023147583,0.0015382767,-0.008003235,-0.0040893555,-0.029434204,0.020904541,-0.0010137558,0.022521973,-0.027328491,0.0066070557,-0.01991272,-0.016296387,-0.0368042,-0.025436401,-0.03186035,0.0004553795,0.030960083,0.0001821518,0.021484375,0.009552002,-0.011138916,0.031433105,0.048461914,-0.0010871887,-0.026626587,-0.0121536255,0.0014762878,-0.00023365021,0.01663208,0.016845703,-0.018936157,-0.017028809,0.0023918152,-0.026763916,0.014434814,0.0043563843,0.008460999,0.00044608116,0.0022335052,-0.0118637085,0.036590576,-0.0077400208,-0.0043258667,0.006942749,0.0018472672,0.050445557,0.022491455,-0.011650085,0.01701355,0.010765076,-0.032043457,0.05908203,0.00038027763,0.028625488,-0.012779236,0.003627777,-0.039123535,-0.018920898,-0.0013713837,0.0049591064],"createdAt":"2026-04-21T18:32:23.975Z","updatedAt":"2026-04-22T01:02:19.441Z","lastSeenAt":"2026-04-22T01:02:19.441Z","tsv":"'/api':221 '/api/v1/keys/74':69,186 '/pricing':222 '/readme':224 '/request':19,38,169 '0.02':18,37,80,168 '000':84 '20':83 '6':90 'access':75,179,208 'account':102 'actual':247 'advertis':125 'ai':12,31,136 'analysi':140 'analyt':130 'api':5,24,45,74,100,196,207 'attach':108 'avail':219 'base':8,27,63,85 'base network api' 'beyond':254 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':128,197 'caveat':181 'claim':173 'classif':143 'clear':189 'confirm':243 'connect':230 'content':236,261 'convers':160 'cost':77 'data':11,30,129,133 'decim':91 'descript':203 'document':211,238 'embed':144 'enabl':44 'endpoint':16,35,57,67,127,164,184,246 'estim':154 'exampl':215 'exchang':149 'expect':253 'export':134 'feed':148 'financ':13,32,145 'four':126 'gas':153 'generat':161 'geocod':158 'handl':94 'header':113 'http':256 'http-post' 'import':180 'imposs':241 'infrastructur':156 'input':251 'insight':135 'instant':178 'json':260 'json-response' 'key':101 'land':200 'learn':138 'limit':176 'list':71,163 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'map':190 'metric':131 'micropayment api' 'name':195 'network':64 'no-api-key' 'offer':10,29 'openapi':212 'page':201,225 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':217 'payment':92,112,118 'per':3,22,55,81 'platform':6,25,46,124,172 'post':257 'premium':73,206 'premium api access' 'price':147,170 'probe':185 'prompt':232 'protocol':98 'provid':48 'quot':152 'rate':150,175 'report':132 'request':56,121 'request/response':216 'requir':106 'return':227,248 'schema':213 'sentiment':139 'settl':58 'share':165 'sign':116 'simpli':205 'specif':66,183 'subscript':104 'substant':235 'summar':142 'text':141 'token':151 'type':262 'unit':86 'usdc':9,28,60,88,117 'usdc api' 'usdc-base-settlement' 'util':15,34,157 'valid':159 'via':95 'wallet':231 'web3':146 'wider':123 'without':237 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ed546bd3-4188-4e80-ab24-7a15a458efd4","listingId":"ece63e6e-785a-46a2-b2af-b93c586124bd","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/keys/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.975Z"}],"sources":[{"listingId":"ece63e6e-785a-46a2-b2af-b93c586124bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.975Z","lastSeenAt":"2026-04-22T01:02:19.441Z"}],"details":{"listingId":"ece63e6e-785a-46a2-b2af-b93c586124bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/74 \\\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 platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/keys/74 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/keys/74"}],"useCases":["Programmatic access to paid API endpoints without creating accounts or managing API keys","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 protocol integration for pay-per-request microservices"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need frictionless, keyless API access via crypto micropayments","Use cases where per-call pricing at $0.02 is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.02Z"},"updatedAt":"2026-04-22T01:02:19.441Z"}}