{"id":"558957f9-2a99-4606-a449-3060d15eac34","shortId":"dQKw4E","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 across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/keys/23` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). No API keys or rate limits are advertised; access is gated purely by the x402 payment header. The endpoint accepts POST requests and returns `application/json`.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/keys/23` endpoint actually returns. The name \"Premium API Access\" and its path (`/keys/23`) suggest it may return or provision an API key or access token, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","pay-per-call API","micropayment API","USDC API access","Base network API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","The exact purpose of /api/v1/keys/23 ('Premium API Access') is unclear — it may provision keys or tokens but this is unconfirmed","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/23","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/keys/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the purpose of /api/v1/keys/23 specifically is unclear. 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":"2026-04-21T22:06:24.133Z","embedding":[-0.007095337,-0.019088745,0.03955078,0.010612488,0.02659607,-0.03527832,-0.034088135,0.052856445,0.05908203,-0.0715332,0.025909424,-0.037200928,-0.025283813,-0.046295166,-0.029876709,0.0060310364,-0.017166138,0.00881958,-0.042785645,0.033050537,0.010185242,-0.029251099,-0.009925842,0.023468018,-0.0049972534,-0.018325806,-0.0046043396,-0.028457642,-0.005622864,-0.034301758,0.061584473,-0.025787354,-0.0149002075,0.010429382,-0.030075073,-0.011558533,-0.013290405,0.0151901245,0.035308838,-0.016296387,-0.015823364,-0.057800293,0.0017261505,-0.012069702,-0.03955078,-0.0046653748,-0.00067949295,-0.0143585205,-0.006374359,0.009559631,-0.0368042,-0.019348145,-0.0061149597,-0.0015268326,0.0129776,0.020843506,-0.010513306,-0.008079529,0.017471313,0.008575439,0.008911133,-0.048095703,-0.013183594,0.00869751,-0.0116119385,0.04623413,-0.018569946,0.048614502,0.005821228,0.045043945,0.049987793,0.044952393,0.01701355,0.014640808,-0.0047798157,0.0068740845,-0.004863739,0.06274414,-0.02029419,-0.013824463,-0.016586304,-0.002439499,-0.02848816,-0.0068855286,-0.011390686,-0.053649902,-0.01586914,-0.0022201538,-0.029312134,0.032104492,-0.07086182,-0.038482666,-0.017318726,0.017990112,0.026000977,0.0132369995,-0.0093307495,0.021148682,-0.03186035,0.023330688,-0.0025138855,-0.034484863,0.0059318542,0.009925842,0.037322998,0.057434082,0.008430481,0.01914978,0.011810303,-0.01828003,-0.06866455,0.0056114197,-0.020080566,-0.013961792,0.012557983,0.01234436,-0.023239136,0.009315491,-0.029876709,-0.0063285828,-0.061798096,0.03314209,0.037261963,0.010017395,-0.005859375,-0.052368164,-0.012512207,0.0042686462,-0.022979736,-0.033691406,0.0020637512,0.014579773,0.021560669,-0.011299133,-0.0357666,0.0035572052,-0.017089844,-0.031799316,-0.03994751,-0.03250122,0.025146484,-0.02520752,0.042510986,0.02519226,-0.11077881,-0.02810669,-0.050109863,0.0060310364,-0.030639648,0.0064582825,-0.0025634766,0.024154663,-0.027542114,-0.013389587,0.0018081665,-0.01586914,0.0014867783,0.018218994,-0.014053345,0.04812622,-0.019485474,0.046691895,0.019607544,0.004623413,0.021713257,0.02746582,0.004508972,-0.081726074,-0.07751465,-0.02658081,-0.010932922,-0.035461426,-0.023361206,0.010498047,-0.021957397,-0.052490234,-0.027877808,0.001332283,-0.0025672913,-0.034973145,-0.020385742,-0.022903442,0.0054740906,-0.007873535,-0.054107666,-0.008056641,-0.02178955,0.07330322,0.007156372,0.026901245,0.034240723,-0.013809204,0.06173706,0.023513794,-0.025314331,-0.03427124,0.008575439,-0.016052246,0.026062012,-0.0009484291,-0.0025138855,-0.03729248,0.035888672,0.053344727,0.023986816,-0.012359619,-0.023376465,-0.044036865,-0.04168701,-0.034973145,0.0181427,0.014579773,0.008338928,0.046844482,-0.04333496,-0.019226074,-0.016937256,0.009559631,0.012268066,0.0871582,-0.0043640137,-0.0135269165,0.015419006,0.014579773,-0.043273926,0.044403076,0.03378296,0.011955261,-0.016937256,-0.020111084,0.02734375,0.028182983,-0.012336731,0.0010614395,-0.022918701,0.035186768,0.0024490356,0.00466156,0.02798462,-0.01676941,-0.017913818,-0.031097412,-0.029647827,0.04156494,-0.0008029938,-0.012817383,-0.02571106,-0.08557129,0.047058105,0.035095215,0.048339844,-0.024475098,0.013290405,-0.02508545,0.0001244545,-0.068847656,0.053710938,0.08312988,0.01637268,-0.02053833,0.017074585,-0.008636475,-0.025665283,0.0024108887,0.00025224686,-0.039489746,-0.017730713,0.02116394,-0.055358887,-0.008659363,0.025650024,0.024215698,0.061676025,-0.011886597,-0.033172607,-0.01965332,0.007926941,-0.010612488,-0.035247803,-0.009613037,-0.0028076172,0.007583618,0.039245605,-0.013442993,0.020492554,0.0046653748,0.014984131,-0.013885498,-0.022766113,-0.020950317,-0.018936157,0.006500244,0.014778137,-0.055236816,0.021972656,-0.006122589,0.060699463,-0.036132812,0.025848389,-0.0069389343,0.019424438,0.03463745,-0.006706238,-0.04232788,0.0057792664,0.035095215,0.017913818,0.04837036,0.0038967133,-0.034423828,-0.00315094,0.07977295,-0.009544373,-0.014312744,-0.017456055,-0.0013990402,0.028442383,-0.023880005,-0.059020996,-0.02633667,-0.014755249,-0.037628174,0.011993408,-0.022109985,0.021697998,-0.0017786026,0.0010852814,-0.012268066,0.0048713684,-0.025299072,0.043121338,-0.03201294,0.012619019,-0.021102905,-0.033843994,-0.0017871857,0.023635864,-0.008369446,-0.00818634,0.03390503,0.028152466,-0.023117065,-0.036590576,-0.018249512,-0.013290405,0.0050354004,0.02885437,0.022979736,0.01878357,0.044677734,-0.02746582,0.014015198,0.03363037,0.017730713,0.029251099,-0.015113831,0.0019483566,-0.06549072,-0.04864502,-0.022659302,-0.026168823,0.01713562,0.019851685,-0.004589081,0.042907715,-0.002374649,-0.026123047,-0.049682617,0.03286743,-0.032684326,0.0014572144,0.024414062,-0.009254456,-0.042114258,-0.0058403015,0.0035476685,0.0112838745,0.044921875,0.005054474,0.012313843,0.068237305,0.043273926,-0.011856079,0.022247314,0.010307312,0.024749756,0.013389587,-0.018432617,-0.021499634,0.014038086,0.026473999,-0.029891968,-0.025177002,-0.068237305,0.06390381,0.05126953,0.07293701,0.02406311,0.009628296,0.033050537,-0.021560669,0.011703491,-0.012588501,-0.0064430237,-0.01651001,-0.04837036,0.043945312,-0.011291504,0.0014038086,-0.02519226,0.05331421,-0.0036354065,0.024169922,-0.04043579,0.05316162,0.0021686554,0.007423401,0.00070524216,0.003282547,0.037872314,0.057647705,-0.04385376,0.002336502,0.027053833,-0.040222168,-0.0017137527,0.061950684,-0.0127334595,-0.01008606,-0.062042236,-0.026626587,-0.004486084,0.0018033981,-0.05102539,-0.0041923523,0.0028266907,0.017974854,0.041534424,-0.037139893,-0.021835327,-0.011909485,-0.036712646,-0.05279541,0.0013504028,-0.0541687,-0.0019311905,0.042236328,-0.03729248,-0.029541016,0.011711121,-0.010108948,-0.004131317,-0.0003092289,0.029693604,-0.0126571655,-0.041015625,0.048706055,0.022201538,0.002161026,0.013504028,0.02305603,0.012062073,0.013015747,0.049682617,0.004207611,-0.03378296,-0.062042236,0.03479004,-0.053253174,0.014823914,0.018737793,-0.012229919,-0.010192871,0.0014247894,-0.029769897,-0.037750244,0.0070533752,-0.033050537,0.00674057,0.02394104,-0.03353882,-0.010826111,-0.06311035,-0.008514404,-0.004787445,0.07836914,0.03010559,-0.012741089,-0.053009033,-0.0039787292,0.010818481,-0.0013256073,0.034606934,-0.013923645,-0.014846802,0.0024471283,-0.03012085,-0.010437012,-0.020996094,0.01713562,0.00047826767,-0.009727478,0.033691406,0.022705078,-0.001830101,0.010887146,0.011245728,0.011665344,-0.036712646,-0.00969696,-0.007205963,0.031982422,0.0033855438,-0.0041160583,-0.028411865,0.037872314,0.015090942,0.024108887,-0.031311035,-0.0016384125,0.005432129,0.0051002502,0.031463623,-0.014625549,-0.019897461,-0.0021953583,-0.053466797,-0.055541992,0.038330078,-0.029510498,0.026031494,0.0063819885,0.015563965,0.025039673,-0.01612854,0.010444641,0.027801514,-0.027313232,-0.0043907166,-0.018997192,-0.030349731,-0.009422302,0.017349243,-0.0209198,0.01348114,-0.016326904,0.00932312,-0.0012226105,-0.028259277,0.023666382,0.012786865,-0.005466461,0.017669678,0.0006785393,0.030563354,0.0546875,0.006252289,-0.029876709,0.027420044,-0.0012655258,0.016967773,-0.005191803,0.044158936,0.03604126,-0.020812988,-0.0057868958,0.0074920654,-0.0026302338,-0.0099105835,-0.004234314,0.004470825,0.02456665,-0.025314331,-0.052368164,0.01878357,0.023117065,-0.023025513,-0.013977051,0.024932861,0.01473999,-0.031982422,0.034240723,0.025604248,0.059539795,-0.018997192,0.021255493,0.018936157,0.029876709,0.021942139,-0.0037975311,-0.008972168,0.008018494,-0.02204895,0.0010375977,-0.016067505,0.021469116,0.029647827,-0.009475708,0.008460999,0.04385376,0.009681702,-0.024520874,-0.033203125,0.013717651,-0.021911621,-0.009521484,-0.0019292831,0.016021729,0.013404846,-0.021820068,0.015823364,0.009590149,-0.013694763,-0.019119263,-0.009010315,0.026000977,-0.010772705,-0.00856781,0.011779785,-0.0048294067,0.018875122,-0.04373169,-0.0025691986,0.013442993,0.017501831,-0.030761719,-0.05038452,-0.042388916,0.015731812,0.036346436,0.007156372,0.026290894,0.03643799,0.0035552979,-0.008148193,0.022903442,0.0056419373,-0.019332886,-0.009719849,-0.041259766,-0.020828247,-0.007270813,0.0041923523,-0.032409668,0.018936157,-0.00018620491,-0.03540039,0.014549255,-0.0017852783,-0.011634827,-0.005859375,-0.0046958923,0.04031372,0.007091522,0.015533447,-0.018325806,-0.035095215,-0.003829956,0.0038776398,0.0181427,-0.044189453,0.03503418,-0.0129470825,-0.015899658,0.00054454803,0.016479492,0.0126953125,0.03869629,0.020431519,0.025375366,-0.05014038,0.05114746,-0.04714966,0.018157959,0.00042366982,-0.036010742,-0.00041484833,-0.030197144,-0.018447876,0.047332764,-0.011711121,-0.0035076141,-0.03338623,-0.020812988,-0.0046958923,-0.046081543,0.022964478,0.04272461,0.041107178,-0.02078247,0.005756378,-0.0018920898,-0.0016813278,-0.015457153,-0.008872986,0.00074243546,0.0104904175,0.012268066,-0.0072631836,-0.0115737915,-0.023666382,-0.019821167,-0.020614624,-0.051574707,-0.05596924,0.004863739,0.015319824,-0.0002387762,-0.009666443,-0.036895752,-0.038879395,0.0038318634,-0.04449463,0.0098724365,-0.006668091,0.0037345886,-0.004425049,-0.011993408,0.019744873,0.025314331,-0.030426025,0.032562256,-0.0059394836,-0.005092621,-0.024353027,0.013633728,0.030975342,0.011123657,0.0063095093,-0.0045661926,-0.014823914,-0.01751709,-0.047729492,-0.01525116,-0.010391235,-0.0113220215,-0.011253357,-0.0005865097,-0.043640137,-0.0063476562,-0.014091492,-0.010810852,0.030075073,0.03543091,0.005027771,-0.019195557,0.009788513,-0.006378174,-0.017791748,-0.027389526,0.019760132,0.009773254,0.003376007,0.01914978,0.04260254,0.017501831,-0.010673523,0.010818481,0.019439697,0.03137207,-0.01777649,-0.0030822754,-0.027160645,0.017059326,-0.013427734,-0.012580872,-0.030685425,-0.0016717911,0.08026123,0.007091522,-0.011146545,-0.010421753,-0.011207581,0.017959595,0.014076233,-0.06427002,-0.0017709732,-0.03945923,0.010421753,-0.025405884,0.035369873,-0.00068569183,0.0032348633,-0.022338867,-0.05279541,-0.0048675537,0.0072746277,-0.01727295,-0.06518555,-0.016311646,-0.04486084,0.004917145,-0.0104599,-0.022857666,-0.0044822693,-0.00036501884,-0.0058784485,-0.0814209,0.010284424,0.052337646,0.016464233,0.018066406,-0.011207581,0.007686615,0.01612854,-0.023422241,-0.012123108,0.033203125,-0.028717041,-0.022888184,-0.0118255615,0.01739502,-0.013938904,-0.011482239,0.022415161,-0.0072250366,0.036346436,-0.0012254715,0.006248474,-0.018463135,0.019195557,-0.024551392,0.017211914,-0.002483368,-0.0011730194,0.0362854,-0.039154053,0.023895264,0.011100769,0.0113220215,0.013336182,0.027999878,0.035095215,-0.032470703,-0.016830444,0.021270752,-0.005634308,0.029327393,-0.034057617,0.04058838,0.013786316,-0.01461792,0.018295288,-0.005428314,-0.010185242,-0.04135132,-0.030944824,0.032928467,0.014823914,0.0043296814,-0.018722534,0.0068092346,0.030227661,-0.019042969,0.0134887695,-0.014152527,-0.018096924,-0.030578613,-0.0010242462,-0.010871887,0.0042266846,0.0025615692,0.025421143,0.01574707,0.031585693,0.010543823,-0.008140564,0.013450623,0.023040771,-0.0070648193,-0.0020656586,0.01889038,0.006164551,0.0044670105,0.019729614,-0.0019950867,-0.046020508,0.011665344,-0.027755737,-0.024276733,0.0087890625,-0.0112838745,-0.024642944,-0.0023269653,0.0046806335,-0.0043258667,-0.031799316,0.015304565,-0.03604126,-0.02116394,-0.0019702911,-0.0065231323,0.016448975,0.0071754456,0.013694763,0.020141602,0.002462387,0.06604004,-0.0011281967,-0.0044670105,0.025466919,0.02470398,0.029006958,-0.03366089,-0.014183044,-0.015571594,0.019821167,0.0025405884,-0.038391113,0.021270752,0.030761719,-0.02204895,0.0113220215,0.016189575,0.03265381,-0.026626587,0.0031547546,-0.0010662079,0.018707275,-0.02067566,0.03149414,-0.04159546,0.0143585205,0.012504578,0.0040359497,-0.015525818,-0.022445679,-0.023712158,0.014297485,-0.004386902,-0.02607727,0.04714966,-0.003107071,0.020080566,-0.0049209595,-0.013824463,0.013999939,-0.04168701,-0.02204895,0.035339355,-0.0018205643,-0.0016899109,0.012741089,-0.024810791,0.024673462,-0.03189087,0.002658844,0.011619568,-0.0046691895,-0.014831543,-0.0026378632,-0.024536133,0.0013103485,-0.014411926,-0.011039734,-0.0010662079,0.05770874,0.03869629,0.029724121,0.042633057,0.007255554,0.005340576,-0.030532837,-0.012886047,0.00093603134,-0.016830444,0.01626587,0.0067443848,0.04345703,0.042053223,-0.0015039444,0.026779175,0.03894043,0.020385742,-0.006290436,0.007358551,-0.012763977,0.0151901245,-0.0079956055,0.030761719,0.0088272095,0.035125732,-0.032104492,0.01411438,0.024475098,0.017715454,-0.024902344,0.0368042,0.06549072,0.019897461,-0.005329132,0.031982422,0.0050468445,-0.0020122528,-0.011077881,-0.020629883,0.05331421,0.021560669,0.045715332,0.041931152,0.0006222725,0.013748169,0.01348114,-0.024673462,-0.025009155,0.074279785,0.012504578,-0.020965576,-0.012741089,-0.018753052,-0.00075674057,-0.043792725,-0.03768921,0.008094788,-0.008384705,0.004005432,-0.026367188,-0.015266418,-0.012199402,0.0020618439,0.013801575,0.010383606,-0.015899658,0.022384644,0.021408081,0.0036029816,0.030639648,-0.010047913,0.03604126,-0.020599365,-0.037597656,0.015289307,0.01473999,-0.0021438599,-0.010040283,0.021636963,0.01158905,0.043182373,0.04446411,-0.016479492,0.015380859,0.03314209,0.008178711,0.00566864,0.06781006,0.033050537,0.019577026,0.023254395,0.042785645,0.0395813,-0.035095215,0.009307861,0.010185242,-0.0057754517,-0.010940552,-0.016479492,-0.0027809143,-0.00056505203,0.010765076,-0.0076904297,-0.020065308,0.026504517,0.018554688,-0.0018472672,0.004322052,-0.0124435425,0.008148193,-0.013938904,0.002281189,0.026626587,-0.015625,0.03201294,0.013954163,0.019897461,-0.02178955,0.027282715,0.008354187,-0.020584106,-0.0098724365,0.024383545,-0.036346436,0.008529663,0.0038204193,-0.0023479462,-0.042938232,0.01159668,0.021331787,-0.00843811,0.039245605,0.011131287,-0.006996155,-0.0039253235,0.0008249283,0.003129959,-0.007583618,-0.00484848,-0.025970459,0.02760315,0.03515625,-0.0030536652,0.025558472,-0.013366699,0.0014867783,0.0059165955,-0.0119018555,0.012939453,-0.008125305,-0.021591187,-0.021148682,0.004547119,0.043121338,0.026138306,0.04559326,-0.008728027,-0.02178955,0.010421753,0.030075073,0.008972168,0.017349243,-0.0047912598,0.024978638,-0.0035896301,0.043395996,0.037231445,0.017623901,0.03353882,-0.022476196,-0.00932312,0.019866943,-0.0025997162,0.023895264,-0.015602112,0.013374329,-0.0065994263,0.024124146,-0.022094727,-0.0418396,0.021591187,-0.014511108,-0.017486572,-0.022018433,0.00015699863,0.0045433044,0.031021118,0.05279541,0.031311035,-0.030578613,0.059692383,-0.009933472,0.048614502,-0.008934021,-0.029769897,0.030227661,0.034973145,0.021591187,0.010421753,0.02027893,-0.03086853,0.011650085,0.05621338,0.032043457,0.0077056885,-0.0030078888,-0.01373291,0.029922485,0.0060195923,0.03112793,-0.011123657,0.0038032532,0.0035190582,-0.0090408325,-0.01524353,-0.0042686462,-0.0020141602,-0.003583908,0.039489746,-0.025894165,-0.01285553,-0.02734375,-0.018341064,0.02229309,-0.003993988,0.0069770813,-0.010536194,-0.029464722,0.011138916,-0.034454346,-0.0209198,-0.001572609,0.024017334,-0.043670654,-0.021514893,-0.004333496,0.014976501,-0.0184021,0.0209198,0.022949219,-0.008216858,0.012634277,0.037231445,-0.01739502,0.03164673,-0.009391785,0.022644043,0.04675293,0.0006713867,-0.016784668,-0.0022621155,0.01083374,-0.01499939,0.020690918,0.03543091,-0.013252258,-0.0036067963,0.0019874573,-0.008529663,-0.001876831,-0.010063171,-0.0037269592,-0.00007861853,0.00015377998,0.0011291504,-0.0035877228,0.016189575,0.007896423,0.0027770996,-0.031341553,-0.024032593,0.019592285,0.033233643,0.017700195,-0.035064697,-0.010871887,0.0049591064,0.009544373,-0.00365448,-0.01701355,-0.018737793,-0.040527344,0.017074585,0.024490356,0.0051841736,0.014907837,-0.02532959,-0.008857727,0.010498047,0.0012388229,0.014564514,0.0067443848,-0.019515991,0.004306793,-0.006259918,-0.027053833,-0.016098022,-0.01612854,0.00484848,0.020736694,-0.0026493073,-0.024993896,0.026626587,-0.00014925003,0.014472961,0.00084733963,-0.011703491,0.019897461,-0.014579773,-0.017868042,-0.001789093,0.026550293,-0.012786865,-0.008354187,-0.015022278,0.028259277,0.035827637,-0.011100769,-0.019195557,0.015823364,0.008850098,0.021240234,0.041748047,0.012367249,0.037628174,0.027923584,-0.009284973,-0.00944519,0.012916565,-0.00012886524,-0.018722534,0.00868988,0.0007581711,-0.022521973,0.038238525,0.0059661865,-0.005367279,-0.028823853,-0.023956299,0.0021076202,-0.014526367,0.017410278,-0.0074920654,0.02230835,-0.003490448,-0.011108398,-0.00806427,-0.0026798248,-0.058013916,-0.023284912,0.0031013489,-0.0047798157,-0.06390381,-0.008544922,-0.03918457,0.011978149,-0.020614624,-0.019546509,-0.0028057098,0.03967285,-0.009147644,0.011886597,-0.005367279,0.021316528,0.021896362,0.015686035,0.024002075,-0.015930176,-0.023284912,-0.030654907,0.015434265,-0.02029419,0.018722534,0.004211426,0.036132812,0.020263672,0.005996704,-0.0029754639,-0.011306763,-0.003665924,-0.007217407,-0.012123108,-0.01953125,0.012168884,0.016784668,-0.0022010803,-0.011222839,0.037353516,-0.024459839,0.0037822723,0.021865845,0.05569458,0.0036945343,0.029724121,-0.016433716,-0.01360321,-0.0031757355,0.00082731247,-0.016525269,0.009757996,0.02142334,0.011528015,0.0005350113,0.0029258728,0.009689331,-0.012825012,-0.0077819824,0.019348145,0.0061683655,-0.015655518,0.035186768,0.013847351,0.013374329,-0.018295288,-0.022705078,0.028305054,0.043029785,0.017745972,0.014015198,0.007881165,0.012573242,-0.020065308,0.008552551,-0.0019741058,-0.024658203,-0.029312134,-0.024612427,-0.04046631,0.018234253,0.0039711,0.013580322,0.008926392,0.0149383545,-0.009338379,-0.031799316,-0.019699097,0.020858765,-0.00039100647,-0.015136719,-0.014144897,-0.00003373623,0.019943237,-0.02482605,-0.004096985,-0.033325195,-0.025894165,0.0043029785,-0.01486969,0.01687622,0.000077962875,-0.008285522,0.0027770996,-0.010856628,0.01058197,-0.012504578,0.02557373,-0.0066833496,0.011474609,0.0060310364,0.006252289,-0.018341064,0.0064468384,-0.009254456,0.0031528473,0.022415161,-0.005973816,0.011856079,-0.010536194,0.03933716,-0.0014677048,0.00027441978,0.045166016,-0.0009446144,0.014846802,-0.027008057,0.006504059,0.008911133,-0.006134033,0.04748535,-0.014221191,-0.027191162,0.008644104,-0.02178955,-0.024734497,0.0046920776,0.022354126,0.038513184,-0.019470215,0.036712646,-0.007873535,0.0033569336,0.012420654,0.016235352,-0.019744873,-0.0033855438,0.041992188,0.016220093,-0.004299164,-0.0018510818,-0.005180359,-0.03793335,-0.009399414,0.015342712,-0.0022182465,-0.0096206665,0.016677856,0.00655365,0.035888672,-0.0009484291,0.009422302,0.012840271,0.009674072,0.02609253,-0.0024585724,0.05105591,-0.015899658,-0.035095215,0.003917694,0.013542175,-0.016586304,-0.0077667236,-0.005645752,-0.005886078,-0.032684326,0.028411865,-0.00018000603,0.032928467,-0.023101807,0.0143966675,-0.02520752,-0.018188477,-0.036010742,-0.015281677,-0.03463745,0.00983429,0.03579712,-0.0073776245,0.020324707,0.0071487427,-0.022018433,0.036834717,0.055358887,0.012702942,-0.02218628,-0.014221191,0.002401352,-0.0058631897,0.0044670105,0.015380859,-0.020721436,-0.010108948,0.0032615662,-0.02798462,0.01234436,-0.0018587112,0.011444092,0.0055274963,-0.00035905838,-0.0037822723,0.027130127,-0.0044822693,-0.002714157,0.0107040405,0.00016534328,0.05331421,0.01727295,-0.0129776,0.018157959,0.005455017,-0.03375244,0.057800293,-0.015563965,0.028793335,-0.00920105,0.014465332,-0.03967285,-0.017318726,-0.0012750626,0.0012302399],"createdAt":"2026-04-21T18:32:23.383Z","updatedAt":"2026-04-22T01:02:18.679Z","lastSeenAt":"2026-04-22T01:02:18.679Z","tsv":"'/api':190 '/api/v1/keys/23':116,222 '/keys/23':234 '/pricing':191 '/readme':193 '/request':19,38 '0.02':18,37,99,135,138 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':156 '20':129 'Base network API' 'USDC API access' 'accept':176 'access':122,165,230,245 'across':58 'actual':224 'addit':204 'address':148 'advertis':164 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,158,229,242 'application/json':181 'base':8,27,107,131,155 'beyond':183 'broad':50 'call':4,23,140 'carri':124 'catalog':51 'categori':60 'chain':146 'charg':127 'classif':75 'classification' 'connect':199 'contract':153 'convers':92 'conversion' 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'detail':206 'document':182,215 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,175,223 'estim':86 'exampl':218 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'gas':85 'gas-estimates' 'gate':167 'generat':93 'geocod':90 'geocoding' 'header':173 'i.e':137 'infrastructur':88 'insight':67 'key':159,243 'land':185 'learn':70 'limit':162 'list':118 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'maximum':126 'may':237 'metric':63 'micropayment API' 'name':227 'network':108 'offer':10,29 'on-chain':144 'openapi':210 'page':186,194 'paid':102 'path':233 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':141,172 'per':3,22,55,100,139 'platform':6,25,46 'post':177 'premium':120,228 'price':79,97 'prompt':201 'protocol':112 'provid':48 'provis':240 'pure':168 'quot':84 'rate':82,161 'report':64 'request':56,101,178 'request/response':213 'resolv':196 'return':180,225,238 'schema':214 'sentiment':71 'sentiment-analysis' 'settl':143 'spars':188 'spec':211 'specif':114 'specul':250 'suggest':235 'summar':74 'technic':205 'text':73 'text-summarization' 'token':83,246 'unit':132 'usdc':9,28,104,134,136,152 'usdc-base' 'use':150 'util':15,34,89 'valid':91 'validation' 'via':109 'wallet':200 'web3':78 'x402':43,111,171 'x402 API marketplace' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cee7f077-c4d0-4bc2-ac57-700fcc3348b2","listingId":"558957f9-2a99-4606-a449-3060d15eac34","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.383Z"}],"sources":[{"listingId":"558957f9-2a99-4606-a449-3060d15eac34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.383Z","lastSeenAt":"2026-04-22T01:02:18.679Z"}],"details":{"listingId":"558957f9-2a99-4606-a449-3060d15eac34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint /api/v1/keys/23 returns a 402 challenge requiring 20,000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/23"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/23"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto price feeds, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting reports with micropayments","Using utility services like geocoding and data validation without subscriptions"],"bestFor":["Agents or developers who want instant, keyless API access via crypto micropayments","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions","Web3-native applications that can settle USDC payments on Base"],"notFor":["High-volume production workloads where per-call crypto settlement adds latency and overhead","Users without a Base-compatible wallet or USDC holdings","Developers who need detailed API documentation, SDKs, or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.896Z"},"updatedAt":"2026-04-22T01:02:18.679Z"}}