{"id":"b5ec7d90-705e-426e-83f0-09b747a5d5dd","shortId":"bym3Lh","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/inbox/158` is listed as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each POST request.\n\nThe broader platform advertises multiple API categories including 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 listed at the same $0.02 per request price point.\n\nHowever, the specific functionality behind `/api/v1/inbox/158` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what data or service it actually provides when paid is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation exists for what /api/v1/inbox/158 actually does when paid — 'Premium API Access' is a generic label","No OpenAPI schema, request format, or response examples are available","The /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content","Cannot verify what service or data is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/158","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/inbox/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/inbox/158 is completely undocumented. This is effectively a stub listing.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-21T21:33:08.856Z","embedding":[-0.018249512,-0.021484375,0.0317688,0.015716553,0.036224365,-0.03640747,-0.025802612,0.036590576,0.06488037,-0.072631836,0.018539429,-0.036499023,-0.039154053,-0.025924683,-0.027053833,0.010169983,0.008094788,-0.0060272217,-0.050323486,0.040496826,0.022659302,-0.0079193115,-0.02470398,0.04147339,0.011245728,-0.013801575,-0.007881165,-0.02029419,-0.010688782,-0.04638672,0.03744507,-0.029769897,-0.007881165,0.014778137,-0.013595581,-0.013183594,-0.00003170967,0.04751587,0.023132324,0.0011072159,-0.0146865845,-0.053375244,0.022872925,-0.01398468,-0.059753418,0.005355835,-0.0016059875,-0.026626587,-0.0019340515,0.008087158,-0.018081665,0.007881165,-0.011367798,-0.006439209,0.033325195,0.015670776,-0.0023288727,-0.0016098022,0.013397217,0.013427734,-0.0022888184,-0.061462402,-0.025543213,0.0010070801,0.004840851,0.0519104,-0.009292603,0.043914795,0.008720398,0.08758545,0.027572632,0.054779053,0.038360596,0.009300232,0.0044288635,-0.032440186,0.005218506,0.057250977,-0.013893127,-0.002571106,-0.008636475,-0.004737854,-0.052001953,-0.010482788,-0.022491455,-0.04144287,-0.018676758,0.027648926,-0.023132324,0.011726379,-0.07757568,-0.009498596,-0.010765076,0.011009216,0.0026245117,-0.012863159,-0.01727295,0.023147583,-0.005420685,0.027648926,-0.0056533813,-0.051971436,0.01449585,0.007129669,0.039855957,0.055419922,0.017715454,0.01777649,0.017929077,-0.016220093,-0.036956787,0.0154418945,-0.03390503,-0.023513794,0.0012950897,0.0029792786,-0.009567261,0.02217102,-0.03274536,0.033721924,-0.03717041,0.049865723,-0.0082473755,-0.0052986145,0.0016002655,-0.04989624,-0.00932312,0.012458801,-0.016983032,-0.0008201599,0.027923584,0.012077332,0.029556274,-0.017440796,-0.048675537,0.00623703,-0.016204834,-0.014793396,-0.05126953,-0.030761719,0.044128418,-0.025985718,0.00818634,0.0345459,-0.09539795,-0.0068473816,-0.048950195,-0.002445221,-0.014350891,-0.016403198,-0.010398865,0.035705566,-0.016738892,-0.023742676,-0.027557373,-0.022247314,0.02293396,0.026535034,-0.008682251,0.05432129,-0.017532349,0.02003479,0.011131287,-0.0055007935,0.013656616,0.016494751,0.0012054443,-0.08276367,-0.07745361,-0.027389526,0.00021326542,-0.013336182,-0.022247314,0.008453369,-0.0018978119,-0.07006836,-0.028366089,-0.015106201,0.007965088,-0.039520264,-0.0022907257,-0.015167236,0.019439697,-0.011016846,-0.044708252,-0.016937256,-0.01777649,0.04977417,0.011352539,0.03186035,0.028335571,-0.026504517,0.060302734,0.040161133,-0.036621094,-0.037506104,0.011116028,-0.02748108,0.01309967,-0.00089359283,0.007965088,-0.029449463,0.040649414,0.06878662,-0.0069122314,-0.004837036,-0.0045204163,-0.042510986,-0.04421997,-0.029556274,0.02418518,0.025497437,-0.0075263977,0.023239136,-0.049224854,-0.043426514,-0.006752014,0.00025725365,0.01473999,0.05947876,0.0028915405,0.006641388,0.00957489,0.03353882,-0.04663086,0.042236328,0.03250122,0.005504608,-0.04434204,-0.025314331,0.01927185,0.048919678,-0.029556274,0.0015563965,-0.010887146,0.029876709,-0.01398468,-0.004852295,0.01687622,-0.0064048767,-0.014793396,-0.03363037,-0.014945984,0.022415161,0.010276794,-0.021713257,-0.03414917,-0.064819336,0.04345703,0.04296875,0.050445557,0.0017156601,-0.009384155,-0.027008057,-0.009796143,-0.06390381,0.06365967,0.06817627,-0.013397217,-0.013580322,0.023254395,-0.028381348,-0.021591187,0.021347046,-0.007637024,-0.032928467,-0.0044403076,0.009552002,-0.04434204,0.0005450249,0.0059394836,0.033721924,0.056365967,-0.00001013279,-0.0435791,-0.019073486,0.002035141,-0.026245117,-0.0211792,-0.006477356,-0.009941101,-0.0014343262,0.024353027,-0.010284424,0.019470215,-0.002336502,0.025924683,-0.000031530857,0.00548172,-0.014541626,-0.02029419,0.01914978,0.012207031,-0.04953003,0.0069465637,-0.021591187,0.06188965,-0.054992676,0.032806396,-0.011070251,0.02104187,0.03778076,0.024017334,-0.04663086,0.00579834,0.02557373,0.018630981,0.04837036,0.00894165,-0.017593384,-0.022277832,0.074401855,-0.028808594,0.0036296844,0.012397766,0.016555786,0.03289795,0.00055122375,-0.056243896,-0.037872314,0.003068924,-0.038726807,0.02822876,-0.031982422,0.033111572,-0.0076675415,0.00881958,-0.03277588,0.000010192394,-0.026748657,0.025512695,-0.020324707,0.008956909,-0.03050232,-0.0209198,0.010421753,0.012496948,-0.01096344,-0.0021381378,0.024017334,0.037628174,-0.006252289,-0.03286743,-0.027267456,-0.016693115,-0.0039520264,0.021240234,0.02507019,0.01966858,0.039642334,-0.03552246,0.00945282,0.033050537,0.003314972,0.041656494,-0.009651184,0.015403748,-0.07336426,-0.054229736,-0.016555786,-0.039154053,0.029296875,0.0053710938,-0.007926941,0.050323486,0.010139465,-0.030654907,-0.059417725,0.028518677,-0.057250977,0.017929077,0.045074463,-0.021942139,-0.033477783,0.01625061,0.0013055801,0.017837524,0.032165527,0.020507812,0.027450562,0.085998535,0.045654297,-0.0018587112,0.020812988,0.019943237,0.027267456,0.0069999695,-0.019729614,-0.022766113,-0.0053482056,0.028747559,-0.02885437,-0.017303467,-0.07080078,0.039916992,0.044708252,0.091430664,0.02748108,0.014335632,0.03857422,-0.017166138,0.022216797,-0.021438599,-0.020584106,-0.035949707,-0.04006958,0.019195557,-0.012840271,0.006336212,-0.0385437,0.03967285,-0.006298065,0.018051147,-0.023254395,0.045715332,-0.0009851456,-0.0071754456,0.020629883,0.012283325,0.050720215,0.048736572,-0.04815674,0.016067505,0.027496338,-0.021652222,0.0045928955,0.029968262,-0.015106201,-0.019927979,-0.06008911,-0.04623413,-0.017196655,-0.007499695,-0.051940918,0.009101868,0.0012397766,0.016799927,0.01713562,-0.007987976,0.0031909943,0.0011348724,-0.027923584,-0.06585693,0.013175964,-0.05001831,0.0027675629,0.04525757,-0.024337769,-0.014984131,0.007423401,-0.006614685,0.0047302246,0.016021729,0.022079468,-0.004459381,-0.053344727,0.017623901,0.008880615,-0.0031375885,0.02003479,0.02960205,0.018325806,0.031204224,0.053527832,0.019744873,-0.023071289,-0.046905518,0.022750854,-0.046173096,-0.0077552795,0.014778137,-0.023956299,0.00894165,-0.016555786,-0.023086548,-0.023635864,0.020614624,-0.03552246,0.0002412796,0.035491943,-0.0074005127,-0.014762878,-0.056549072,-0.033081055,-0.0038547516,0.06573486,0.032592773,0.0028820038,-0.045562744,-0.0041770935,0.0043258667,0.011672974,0.03552246,-0.014427185,-0.0077552795,-0.019958496,-0.024276733,-0.024154663,-0.011802673,0.026855469,0.010185242,-0.008682251,0.025787354,0.004886627,0.014282227,0.0069122314,0.0054740906,0.025238037,-0.014854431,-0.014503479,-0.000790596,0.040496826,0.0063591003,-0.0043907166,-0.050048828,0.044128418,0.0013656616,0.036590576,-0.037597656,-0.02079773,-0.014205933,0.02053833,0.011619568,-0.007663727,-0.0075187683,-0.0021476746,-0.060150146,-0.091430664,0.048797607,-0.02394104,0.01889038,0.007965088,0.01637268,0.019897461,-0.001241684,-0.0037002563,0.013473511,-0.021087646,-0.0095825195,-0.017288208,-0.020385742,-0.009284973,-0.008903503,-0.016204834,0.024917603,-0.011306763,0.022949219,0.00021398067,-0.013710022,0.029037476,-0.016220093,-0.007221222,0.028900146,0.00844574,0.029220581,0.04159546,0.0060768127,-0.036590576,0.023880005,-0.0055999756,0.022766113,0.0030899048,0.037017822,0.033111572,0.006855011,-0.016113281,-0.006965637,-0.023834229,-0.025527954,0.007949829,0.013282776,0.017349243,-0.00052785873,-0.049224854,0.0068740845,0.01071167,-0.042053223,-0.036621094,0.015945435,0.011192322,-0.0390625,0.011634827,0.03439331,0.0552063,-0.018997192,0.017318726,0.008865356,0.03564453,0.029403687,0.014411926,-0.016998291,0.01852417,-0.0038375854,0.008049011,0.0041656494,-0.013908386,0.022140503,0.0050582886,0.020843506,0.031982422,0.013931274,-0.016098022,-0.04260254,-0.007709503,-0.01033783,-0.011291504,0.021621704,0.013633728,0.032226562,-0.027526855,0.01763916,0.0184021,-0.032043457,-0.0099487305,-0.021255493,0.045013428,-0.0053100586,-0.0041160583,0.012321472,0.019851685,0.026397705,-0.046722412,-0.013839722,0.00484848,0.0011901855,-0.02583313,-0.04788208,-0.044677734,0.002368927,0.029220581,0.008506775,0.022705078,0.03274536,-0.0015411377,0.003850937,0.032409668,0.014556885,-0.019256592,-0.00762558,-0.032562256,-0.00894165,-0.008331299,-0.003490448,-0.032592773,0.01058197,-0.0036334991,-0.018814087,0.0016527176,-0.008300781,0.0026817322,-0.012008667,-0.0012960434,0.0473938,0.0006456375,0.017150879,-0.0065612793,-0.02619934,0.003786087,0.001414299,0.022232056,-0.03186035,0.014984131,-0.010185242,-0.002702713,-0.006954193,0.0039405823,0.007987976,0.023269653,0.004333496,0.04425049,-0.036071777,0.051208496,-0.024108887,0.0057029724,-0.014450073,-0.027862549,0.0046081543,-0.0184021,-0.017532349,0.038909912,-0.027267456,-0.012672424,-0.019729614,-0.028259277,-0.005027771,-0.04663086,0.013328552,0.030136108,0.03152466,-0.032592773,0.0018491745,0.011192322,0.0047836304,-0.012489319,0.0021915436,-0.0065994263,0.020645142,0.02255249,0.00058174133,-0.033966064,-0.027740479,-0.016616821,-0.0019168854,-0.03552246,-0.043884277,-0.017608643,0.0077209473,0.001821518,-0.008239746,-0.029403687,-0.03540039,0.0063056946,-0.03164673,0.018081665,-0.003004074,0.015205383,-0.0060920715,-0.024124146,-0.002571106,0.019470215,-0.00818634,0.043426514,0.007572174,0.0006556511,-0.041015625,0.020019531,0.019454956,0.010307312,-0.013145447,-0.016448975,-0.004135132,-0.031021118,-0.05718994,-0.009437561,-0.010719299,-0.011299133,-0.009429932,0.010643005,-0.04660034,-0.0040512085,-0.02267456,-0.004337311,0.026901245,0.011550903,-0.002319336,-0.009719849,0.012184143,-0.0053596497,-0.009902954,-0.033477783,0.008125305,0.010719299,0.0032978058,0.033996582,0.052246094,0.0029354095,-0.02381897,0.023254395,0.0022697449,0.025466919,-0.019638062,0.0029582977,-0.020446777,0.00055933,-0.0011167526,-0.023666382,-0.045318604,-0.013435364,0.085632324,-0.003211975,0.0028915405,-0.011360168,-0.00894165,0.013343811,0.029815674,-0.033569336,-0.0018291473,-0.020935059,0.017807007,-0.022338867,0.023651123,0.004627228,0.013069153,-0.012687683,-0.051757812,-0.014831543,-0.0039634705,-0.01586914,-0.041107178,-0.021453857,-0.061523438,0.0044937134,-0.014625549,-0.02911377,-0.0061187744,-0.0027713776,-0.02015686,-0.076538086,-0.00025081635,0.058380127,0.0019683838,0.031204224,-0.0025863647,0.021255493,0.017288208,-0.029037476,0.000070273876,0.016601562,-0.038146973,-0.024017334,-0.017349243,0.021713257,-0.0036354065,-0.01713562,0.019607544,-0.0005578995,0.017684937,-0.013206482,0.0137786865,-0.01184082,0.012306213,-0.022338867,0.021087646,-0.019699097,-0.009971619,0.02432251,-0.05014038,0.018447876,0.0065460205,-0.01259613,-0.008071899,0.020629883,0.038146973,-0.031829834,-0.018936157,0.017425537,0.0017251968,0.02760315,-0.031021118,0.052642822,0.0067596436,-0.032562256,0.017288208,-0.001953125,-0.025161743,-0.03161621,-0.0309906,0.014274597,-0.010803223,0.01966858,-0.010307312,0.004928589,0.010902405,0.0035381317,0.011604309,-0.014671326,-0.03540039,-0.015808105,-0.0064201355,-0.006313324,0.006668091,-0.0012702942,0.025482178,0.03201294,0.032287598,0.004940033,-0.017333984,0.007499695,0.029693604,-0.0033912659,0.0074424744,0.03314209,0.009788513,0.013122559,0.01084137,0.008476257,-0.04437256,-0.0072784424,-0.022064209,-0.004890442,-0.0042533875,-0.014350891,-0.0072250366,-0.009407043,0.005935669,-0.0071487427,-0.023223877,0.005634308,-0.033203125,-0.028411865,0.005302429,-0.014129639,0.022079468,0.003921509,0.0059394836,0.007003784,0.0023727417,0.033294678,0.00015485287,-0.025772095,0.01789856,0.034851074,0.013145447,-0.03213501,-0.0121154785,0.004508972,-0.0027503967,0.0018424988,-0.04135132,0.013786316,0.042388916,-0.006752014,0.0051727295,-0.012557983,0.032073975,-0.012336731,0.017608643,-0.014633179,0.014259338,-0.013870239,0.028747559,-0.033172607,0.019454956,0.0110321045,0.01360321,-0.008468628,-0.016189575,-0.030593872,0.017700195,0.016296387,-0.024810791,0.059387207,-0.0024299622,0.029708862,-0.025817871,-0.021713257,0.005012512,-0.028045654,-0.01939392,0.03161621,0.002313614,0.0019302368,0.016220093,-0.019195557,0.036468506,-0.029190063,0.01411438,0.014762878,-0.0003054142,-0.0056495667,-0.021057129,-0.007045746,0.0050468445,-0.01902771,0.0075531006,-0.0048332214,0.05166626,0.02859497,0.032043457,0.05053711,0.0047187805,-0.003698349,-0.041870117,-0.03164673,0.005420685,-0.01272583,0.014907837,-0.014335632,0.056396484,0.037384033,-0.0021915436,0.037200928,0.034973145,0.042175293,-0.00034809113,0.011192322,-0.026367188,0.004295349,0.0029296875,0.03955078,-0.010360718,0.0390625,-0.031097412,0.025314331,0.026229858,0.021011353,-0.02859497,0.02911377,0.066589355,0.015853882,0.0001988411,0.025344849,-0.006881714,-0.008728027,-0.012329102,-0.021331787,0.05770874,0.011634827,0.06585693,0.037384033,0.015167236,-0.000041544437,0.023910522,-0.02520752,-0.021392822,0.051574707,0.022079468,-0.027786255,-0.005847931,-0.00040602684,-0.0014505386,-0.05105591,-0.02267456,0.023651123,-0.0015773773,0.0076179504,-0.0003836155,-0.00687027,-0.012580872,0.008430481,0.0155181885,-0.0020885468,-0.00038599968,0.036102295,0.028335571,-0.007129669,0.022491455,0.0012149811,0.028335571,-0.03475952,-0.014137268,0.017471313,0.020812988,-0.009353638,-0.010475159,0.033294678,0.0012054443,0.042510986,0.040924072,-0.018661499,0.015159607,0.019851685,0.0022659302,0.00006109476,0.06903076,0.037261963,0.007286072,0.031433105,0.025985718,0.03942871,-0.035461426,0.015197754,-0.011222839,-0.00032424927,-0.004688263,-0.016342163,-0.0016374588,-0.007083893,0.009544373,0.008865356,-0.006641388,0.0099105835,0.026031494,-0.0022964478,-0.0072517395,0.0006952286,0.0033340454,-0.017623901,-0.003944397,0.009117126,-0.0231781,0.033721924,0.013801575,0.025482178,-0.016967773,0.013504028,-0.0019388199,-0.013465881,0.0068092346,0.022994995,-0.035614014,0.0026855469,-0.0033664703,0.0079422,-0.05050659,0.0071411133,0.025436401,-0.020477295,0.027053833,0.017410278,-0.013298035,-0.0052261353,0.017425537,0.0037994385,0.0050239563,-0.013153076,-0.028121948,0.016998291,0.047698975,0.0074806213,-0.0009756088,-0.03503418,-0.00969696,0.0007815361,-0.0067253113,-0.011787415,0.0021133423,-0.009384155,-0.03050232,0.01676941,0.03540039,0.019012451,0.04486084,-0.013298035,-0.00983429,-0.00045728683,0.033447266,0.008811951,0.003332138,-0.004966736,0.019851685,-0.0044555664,0.042816162,0.04248047,0.012710571,0.036376953,-0.005027771,-0.016036987,-0.0029850006,-0.022842407,0.0090789795,-0.023895264,-0.0045661926,-0.0011177063,0.03540039,-0.009384155,-0.026611328,0.0052833557,-0.0051193237,-0.021972656,-0.0129776,0.018173218,-0.003168106,0.028884888,0.044128418,0.008934021,-0.034576416,0.060821533,-0.014572144,0.048950195,-0.0035476685,-0.0060310364,0.052093506,0.024108887,0.028076172,0.011230469,0.014282227,-0.035308838,0.018417358,0.042114258,0.029953003,0.027709961,0.008796692,-0.015365601,0.03741455,-0.0019445419,0.02142334,-0.008049011,-0.01158905,0.009391785,-0.002380371,-0.008033752,0.0051231384,-0.0051460266,0.011680603,0.045410156,-0.038085938,-0.008216858,-0.021881104,-0.0155181885,0.033966064,-0.022125244,-0.0036125183,-0.008743286,-0.01701355,0.0068473816,-0.01600647,-0.02444458,0.0003452301,0.024291992,-0.043273926,-0.013763428,0.009483337,0.011917114,-0.022598267,0.037628174,0.016448975,-0.015808105,0.01889038,0.04925537,-0.0058174133,0.021087646,-0.014854431,0.02432251,0.04714966,0.014205933,-0.017349243,-0.00040960312,0.0046653748,-0.021133423,0.003271103,0.033081055,-0.0010900497,0.009635925,-0.009140015,-0.0040664673,-0.0028457642,0.014091492,-0.0050582886,0.0060691833,-0.014907837,-0.010429382,-0.0025177002,0.008659363,0.013557434,0.0012311935,-0.005531311,-0.009971619,0.01525116,0.04336548,0.031021118,-0.042816162,0.003856659,0.0005660057,0.0093688965,-0.017166138,-0.008735657,-0.016067505,-0.037017822,0.02330017,0.008804321,0.01902771,0.019821167,-0.028381348,0.0026302338,0.035736084,0.017089844,-0.0026893616,0.0011968613,-0.01374054,0.019317627,-0.006591797,-0.00034952164,-0.009048462,0.0040893555,0.0038547516,0.010612488,-0.0068092346,-0.037841797,0.01675415,-0.0017547607,0.013259888,-0.008071899,-0.004547119,0.019882202,0.010787964,-0.010910034,0.007972717,0.009422302,-0.022750854,-0.009254456,-0.0289917,0.027496338,0.054992676,-0.010276794,-0.006214142,0.02911377,0.019165039,0.020202637,0.03857422,-0.012390137,0.047607422,0.029403687,-0.015838623,-0.022476196,0.03363037,-0.019866943,-0.018173218,0.020004272,-0.020446777,-0.032226562,0.0135269165,0.0056877136,0.00056791306,-0.031951904,0.001964569,-0.018707275,-0.020568848,0.026260376,-0.023742676,0.011146545,-0.014183044,-0.01158905,0.009513855,-0.023422241,-0.046142578,-0.017211914,0.0021209717,-0.006511688,-0.064208984,0.008850098,-0.021347046,0.019729614,-0.026229858,-0.017532349,-0.007881165,0.014533997,-0.018692017,-0.004558563,0.004711151,0.027786255,0.017608643,0.017089844,0.03353882,-0.0345459,-0.036132812,-0.022949219,0.0063171387,-0.0060768127,0.012763977,0.00774765,0.039245605,0.0158844,-0.006134033,-0.004020691,-0.009902954,-0.005508423,-0.02355957,-0.028900146,-0.027130127,0.037384033,0.015991211,-0.0034637451,0.0056114197,0.05807495,-0.017440796,-0.019515991,0.027816772,0.041748047,0.009979248,0.01687622,-0.012969971,-0.014961243,-0.015548706,0.00054216385,-0.021621704,0.014480591,0.010269165,0.00011372566,-0.020736694,0.0211792,0.029953003,-0.014923096,-0.0035934448,0.033111572,-0.00011563301,-0.016021729,0.027923584,0.009971619,0.001540184,-0.017700195,-0.0063056946,0.019592285,0.058532715,0.020248413,0.008911133,0.009399414,-0.0021972656,-0.01473999,0.006298065,0.008811951,-0.023803711,-0.04095459,-0.012069702,-0.027450562,0.018844604,-0.0062217712,0.018127441,-0.0053215027,0.02708435,-0.01689148,-0.013465881,-0.027648926,0.042297363,-0.0021514893,-0.0026474,-0.011672974,0.01777649,0.0059165955,-0.03933716,0.0038223267,-0.034606934,-0.037841797,-0.009178162,-0.02204895,0.040374756,0.014755249,-0.0037822723,0.0022144318,0.003944397,-0.0030899048,-0.009613037,0.019638062,-0.020187378,0.0014810562,0.024612427,0.017059326,-0.028900146,0.017532349,-0.00983429,-0.009109497,0.020874023,-0.014038086,0.019134521,-0.017471313,0.0335083,-0.00020503998,-0.0063591003,0.031555176,-0.0057754517,-0.0016584396,-0.03475952,0.012802124,-0.0025234222,-0.007446289,0.037750244,-0.026168823,-0.018249512,-0.006816864,-0.022476196,-0.01802063,0.01725769,0.01424408,0.023666382,-0.0067367554,0.041137695,-0.029144287,0.002620697,0.022735596,0.01209259,-0.032562256,0.002204895,0.039245605,0.00046944618,-0.009483337,-0.001168251,-0.008842468,-0.035095215,-0.0001320839,0.0019483566,-0.010765076,-0.0124053955,0.032470703,-0.001996994,0.031951904,-0.0037231445,0.00042676926,0.010177612,0.020614624,0.033294678,0.008369446,0.033050537,-0.0023021698,-0.01689148,-0.003068924,0.0043411255,-0.028717041,0.0036354065,-0.0079422,0.002773285,-0.032684326,0.012680054,-0.008811951,0.034118652,-0.024230957,0.01109314,-0.026245117,-0.0048294067,-0.037078857,-0.008903503,-0.032440186,0.012542725,0.032989502,0.010002136,0.02406311,0.00058221817,-0.015960693,0.029556274,0.04937744,-0.013969421,-0.03186035,-0.01651001,0.0020809174,0.0010681152,0.013908386,0.0065345764,-0.02406311,-0.012718201,0.014259338,-0.023223877,0.003982544,-0.0018281937,0.0051651,0.011436462,0.001909256,-0.0061454773,0.018600464,-0.010299683,-0.008705139,0.0009660721,0.0019512177,0.033721924,0.022979736,0.00006878376,0.019119263,0.024261475,-0.04437256,0.05859375,0.004825592,0.024459839,-0.01889038,0.0090408325,-0.032165527,-0.033081055,-0.008926392,-0.0007619858],"createdAt":"2026-04-21T18:32:20.288Z","updatedAt":"2026-04-22T15:02:57.883Z","lastSeenAt":"2026-04-22T15:02:57.883Z","tsv":"'/api/v1/inbox/158':58,161 '/call':13,29 '0.02':12,28,69,151 '000':75 '20':74 '402':197 '6':81 'Base network API' 'USDC API' 'accept':48 'access':64,171 'account':86 'actual':206 'advertis':91,106 'ai':118 'analysi':122 'analyt':112 'api':5,21,40,63,84,108,170 'attach':94 'avail':184,214 'base':8,24,53,76 'behind':160 'beyond':165 'broader':104 'caller':92 'categori':109 'challeng':199 'classif':125 'confirm':192 'convers':142 'cost':66 'crawl':187 'data':111,115,202 'decim':82 'detail':182 'document':164,183 'embed':126 'endpoint':57,145,190 'estim':136 'exampl':179 'exchang':131 'export':116 'feed':130 'financ':127 'function':159 'gas':135 'generat':143 'generic':167 'geocod':140 'header':98 'howev':156 'includ':110 'infrastructur':138 'insight':117 'json-response' 'key':15,31,85 'label':168 'learn':120 'limit':89 'list':60,147 'live':193 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':119 'materi':215 'maxamountrequir':72 'metric':113 'micropayment API' 'multipl':107 'network':54 'no-api-key' 'openapi':175 'page':188 'paid':209 'pay':2,18,37 'pay per call API' 'pay-per-request':1,17,36 'payment':50,97 'per':3,19,38,70,152 'platform':6,22,41,105 'point':155 'post':101 'post-endpoint' 'premium':62,169 'premium API access' 'price':129,154 'protocol':46 'provid':207 'quot':134 'rate':88,132 'report':114 'request':4,20,39,71,102,153 'request/response':178 'requir':16,32 'return':194 'schema':176 'sentiment':121 'servic':204 'simpli':93 'specif':56,158 'summar':124 'text':123 'token':133 'unit':77 'unknown':211 'usdc':9,25,49,79 'usdc-base-network' 'use':43 'util':139 'valid':141,196 'via':10,26 'web3':128 'x402':11,27,45,96,198 'x402 API' 'x402-payment'","prices":[{"id":"799909ba-651f-43e5-8776-59bc24a1ad6c","listingId":"b5ec7d90-705e-426e-83f0-09b747a5d5dd","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/inbox/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.288Z"}],"sources":[{"listingId":"b5ec7d90-705e-426e-83f0-09b747a5d5dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.288Z","lastSeenAt":"2026-04-22T15:02:57.883Z"}],"details":{"listingId":"b5ec7d90-705e-426e-83f0-09b747a5d5dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/158 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/158"},{"claim":"The platform lists $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/158"},{"claim":"Multiple API categories are advertised including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-request API endpoint without needing API keys or subscriptions","Making programmatic USDC micropayments on Base for API access","Integrating x402-compatible agent workflows with low-cost API calls"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents with x402 payment capability looking for low-cost endpoints","Users who prefer pay-as-you-go pricing without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume users who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.275Z"},"updatedAt":"2026-04-22T15:02:57.883Z"}}