{"id":"4360cda5-fd32-450d-b52e-d3e6e0bb9145","shortId":"VtkVVq","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/223` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/223` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["general","infrastructure"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto pay-per-use"],"warnings":["No documentation available — all doc pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific function of /api/v1/payments/223 ('Premium API Access') is undefined","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/223","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/payments/223","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The purpose of this specific endpoint (/api/v1/payments/223) is entirely unclear beyond the generic label.","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":"2026-04-19T06:52:54.717Z","embedding":[-0.032104492,-0.029708862,0.031707764,0.020721436,0.016143799,-0.029663086,-0.019058228,0.024429321,0.07659912,-0.06365967,0.02355957,-0.052215576,-0.04748535,-0.029678345,-0.026397705,0.003232956,0.0003721714,0.00048065186,-0.024536133,0.0256958,0.027526855,-0.012329102,-0.0390625,0.028244019,-0.0012283325,-0.01525116,-0.011367798,-0.006526947,-0.023025513,-0.038116455,0.050323486,-0.023727417,-0.005859375,0.006931305,-0.010169983,-0.0146484375,0.0039024353,0.030380249,0.02772522,0.0007171631,0.0014123917,-0.062286377,0.0077667236,-0.018661499,-0.05126953,-0.010803223,0.0024528503,-0.021743774,0.0022010803,0.0007648468,-0.03945923,-0.014144897,-0.016525269,0.0019245148,0.0126953125,0.009544373,-0.0066375732,-0.014572144,0.005207062,0.017028809,-0.008255005,-0.058532715,-0.022460938,-0.009689331,0.0045433044,0.05340576,-0.011634827,0.036865234,0.007106781,0.06573486,0.042816162,0.041290283,0.02999878,0.011375427,-0.0025577545,0.0002593994,-0.0020389557,0.058135986,-0.014633179,-0.016693115,-0.01222229,-0.0049324036,-0.057403564,0.004386902,-0.026885986,-0.039886475,-0.024658203,0.019439697,-0.021575928,0.02999878,-0.07409668,0.004611969,-0.012359619,0.001996994,0.0044898987,-0.008392334,-0.009887695,0.032226562,-0.010543823,0.010559082,-0.00762558,-0.04550171,0.017974854,0.0064201355,0.033416748,0.044403076,0.022216797,0.02204895,0.0076408386,-0.0071258545,-0.031707764,0.01235199,-0.008399963,-0.016082764,0.008140564,0.012084961,-0.018173218,0.010467529,-0.02973938,0.020385742,-0.0519104,0.05529785,0.008506775,0.004272461,0.00932312,-0.04736328,-0.012123108,0.028945923,-0.030731201,-0.003370285,0.019622803,0.009384155,0.024765015,-0.021469116,-0.031921387,0.014472961,-0.025863647,-0.011360168,-0.044555664,-0.029266357,0.038085938,-0.028549194,0.015586853,0.03829956,-0.10217285,-0.010276794,-0.04989624,0.016571045,-0.03314209,-0.012313843,-0.004383087,0.028427124,-0.011222839,-0.01374054,-0.028274536,-0.02168274,-0.00050735474,0.037322998,-0.019439697,0.04888916,-0.0178833,0.027633667,0.01802063,0.010231018,0.011207581,0.022857666,-0.00440979,-0.08917236,-0.0814209,-0.015510559,-0.0032138824,-0.019454956,-0.025466919,0.008766174,-0.0052108765,-0.064453125,-0.013519287,-0.018096924,0.0035362244,-0.03918457,-0.00021445751,-0.026046753,0.013137817,-0.0031986237,-0.06628418,-0.023223877,-0.026519775,0.058441162,0.028213501,0.02835083,0.019638062,-0.015380859,0.057891846,0.023727417,-0.024475098,-0.010627747,0.018371582,-0.022155762,0.020812988,-0.015563965,0.009475708,-0.029968262,0.036132812,0.068115234,0.010604858,-0.024353027,-0.011772156,-0.060546875,-0.04727173,-0.03564453,0.013015747,0.0096206665,-0.0012512207,0.03262329,-0.03692627,-0.029022217,0.006210327,0.016067505,0.017059326,0.062683105,0.018096924,-0.008079529,0.026931763,0.020843506,-0.057556152,0.03744507,0.03491211,0.007396698,-0.024856567,-0.028549194,0.024414062,0.049591064,-0.023269653,0.014907837,-0.01687622,0.02456665,-0.012229919,0.0034599304,0.015914917,-0.016021729,-0.02067566,-0.029907227,-0.03253174,0.031982422,0.007888794,-0.032806396,-0.033172607,-0.08270264,0.051635742,0.037322998,0.043945312,0.00032186508,0.010391235,-0.017196655,-0.011802673,-0.07116699,0.058380127,0.07598877,-0.0057907104,-0.010002136,0.016845703,-0.0067863464,-0.033843994,0.010871887,-0.01890564,-0.034576416,-0.031463623,0.01638794,-0.047698975,-0.0014038086,0.026809692,0.027420044,0.049438477,-0.001490593,-0.052886963,-0.015357971,-0.0048446655,-0.0048217773,-0.028396606,0.0036678314,-0.007183075,0.013908386,0.020721436,0.0047683716,0.011436462,0.0016593933,0.0029563904,-0.0058403015,-0.00011485815,-0.006210327,-0.027633667,0.014892578,0.002166748,-0.054992676,0.006881714,-0.000112235546,0.08190918,-0.050201416,0.03540039,-0.007858276,0.010375977,0.0541687,-0.005970001,-0.046203613,0.0009379387,0.024169922,0.010467529,0.04776001,0.010475159,-0.036987305,-0.019363403,0.06890869,-0.0051116943,0.0013990402,0.008834839,0.023269653,0.03942871,-0.00022947788,-0.067993164,-0.029891968,-0.0013532639,-0.04525757,0.028045654,-0.02420044,0.022827148,-0.017929077,0.0034732819,-0.025131226,-0.0036754608,-0.028762817,0.0082473755,-0.016830444,0.00970459,-0.023117065,-0.021575928,0.019515991,0.016433716,-0.004764557,0.012527466,0.040283203,0.023620605,-0.007972717,-0.02798462,-0.027557373,-0.0076522827,-0.004470825,0.015686035,0.01890564,0.025894165,0.046966553,-0.04244995,0.009147644,0.028320312,0.015640259,0.03387451,-0.0014104843,0.0025138855,-0.06427002,-0.0546875,-0.028686523,-0.038146973,0.028579712,0.0103302,-0.013801575,0.052337646,0.010314941,-0.01676941,-0.035827637,0.018692017,-0.042816162,-0.007499695,0.03488159,-0.019332886,-0.025054932,0.0039978027,-0.009757996,0.0067710876,0.033233643,0.02255249,0.03604126,0.06286621,0.043304443,0.0073242188,0.020004272,0.0045051575,0.03125,0.005191803,-0.030807495,-0.03326416,-0.014793396,0.03427124,-0.02355957,-0.019134521,-0.06677246,0.056854248,0.03604126,0.08526611,0.018981934,0.0038070679,0.027404785,-0.01449585,0.014381409,-0.026275635,-0.019424438,-0.01777649,-0.04940796,0.037322998,-0.01953125,-0.005241394,-0.021331787,0.044952393,-0.0076789856,0.021575928,-0.024841309,0.041381836,-0.015686035,-0.006149292,0.01889038,0.014831543,0.05279541,0.061828613,-0.044281006,0.027114868,0.0284729,-0.022140503,0.00881958,0.036376953,-0.019638062,-0.0059661865,-0.05618286,-0.031829834,-0.0074386597,-0.010597229,-0.0491333,0.0061454773,0.010520935,0.019424438,0.021652222,-0.005897522,-0.016693115,-0.0015678406,-0.016616821,-0.056121826,0.0031280518,-0.04168701,-0.0019760132,0.04525757,-0.019165039,-0.007293701,0.004688263,-0.0057525635,0.0075302124,0.013008118,0.025100708,0.000041007996,-0.04675293,0.028015137,0.013015747,0.005607605,0.0036849976,0.036834717,0.01449585,0.026657104,0.055664062,0.020324707,-0.018981934,-0.06866455,0.026016235,-0.04626465,-0.0026874542,0.016983032,-0.02696228,-0.0037136078,-0.010612488,-0.03253174,-0.028579712,0.008262634,-0.0340271,-0.0004324913,0.02192688,-0.014305115,-0.02406311,-0.05038452,-0.03060913,-0.004989624,0.07110596,0.0077667236,0.005012512,-0.059417725,-0.00025558472,0.020965576,0.011230469,0.03640747,-0.013954163,-0.008995056,-0.016555786,-0.038391113,-0.014511108,-0.02796936,0.02230835,-0.0137786865,-0.00333786,0.020767212,0.010307312,0.026290894,0.0034542084,0.009284973,0.02281189,-0.023712158,-0.010986328,-0.0066108704,0.043151855,0.01600647,-0.0074386597,-0.05102539,0.039916992,0.017105103,0.035217285,-0.044281006,-0.0019035339,-0.004611969,0.0028820038,0.021484375,-0.006000519,-0.008872986,-0.0072784424,-0.049316406,-0.053710938,0.04550171,-0.025863647,0.023605347,0.021011353,0.0024852753,0.027114868,-0.008361816,-0.006061554,0.010902405,-0.023757935,-0.005130768,-0.021759033,-0.02960205,-0.01776123,-0.015991211,-0.026626587,0.029190063,-0.02444458,0.018295288,0.0031414032,-0.01777649,0.03086853,-0.0023536682,-0.0021533966,0.01914978,0.0016517639,0.025512695,0.035858154,0.0073165894,-0.043792725,0.0209198,-0.0014448166,0.008514404,-0.0032405853,0.041503906,0.032470703,-0.008476257,-0.00982666,-0.017211914,-0.021072388,-0.02331543,0.0031147003,0.005970001,0.013534546,-0.0024433136,-0.050201416,0.015357971,0.014762878,-0.031433105,-0.026138306,0.013839722,0.0151901245,-0.028381348,0.016723633,0.026916504,0.05911255,-0.023757935,0.0020427704,0.007904053,0.024551392,0.02960205,0.013252258,-0.007522583,0.016021729,-0.0075416565,0.011024475,-0.0060424805,-0.015319824,0.020477295,0.005138397,0.023498535,0.026321411,0.005542755,-0.020812988,-0.035369873,0.0025577545,-0.013595581,-0.024978638,0.018859863,0.022415161,0.025497437,-0.027572632,0.019058228,0.01991272,-0.019256592,-0.016967773,-0.0132369995,0.04284668,-0.019180298,-0.013114929,0.016418457,0.018249512,0.03024292,-0.057617188,-0.0029087067,0.0038585663,0.020004272,-0.01777649,-0.043548584,-0.046783447,0.0054359436,0.03451538,0.01777649,0.025787354,0.038848877,0.009048462,0.010902405,0.029632568,-0.0009365082,-0.018341064,-0.015609741,-0.046142578,-0.026672363,-0.016296387,-0.0005226135,-0.034942627,0.01423645,-0.0047302246,-0.03552246,0.013877869,-0.015037537,0.0005297661,-0.0072784424,0.013298035,0.042541504,0.00008994341,0.019058228,-0.016098022,-0.037628174,0.000767231,0.006427765,0.020355225,-0.047088623,0.016189575,-0.015136719,-0.004211426,0.0034923553,0.008087158,0.021636963,0.025024414,0.013023376,0.034057617,-0.04534912,0.052734375,-0.046203613,0.013702393,0.008728027,-0.039215088,-0.014228821,-0.02748108,-0.014312744,0.0446167,-0.030380249,-0.0059013367,-0.031829834,-0.041015625,-0.016159058,-0.052856445,0.011268616,0.04547119,0.03439331,-0.026992798,0.0009613037,-0.001906395,0.0074272156,-0.0118637085,0.008361816,-0.018798828,0.026626587,0.022216797,0.008148193,-0.035583496,-0.024902344,-0.023712158,-0.005645752,-0.036102295,-0.043426514,-0.005760193,-0.0012664795,-0.007331848,-0.011192322,-0.028244019,-0.033050537,-0.0026454926,-0.040649414,0.0057373047,0.01083374,0.01889038,0.004070282,-0.025421143,0.0014572144,0.018722534,-0.012672424,0.042541504,0.0013875961,-0.011947632,-0.041412354,0.011260986,0.019973755,0.021713257,-0.0022830963,-0.017120361,-0.009414673,-0.020431519,-0.05822754,-0.0028266907,-0.0061149597,-0.0126953125,-0.010673523,0.001958847,-0.04864502,-0.00026249886,-0.019195557,0.0051841736,0.023757935,0.013671875,0.012199402,-0.0013895035,0.009788513,0.0028839111,-0.005760193,-0.032226562,0.018951416,0.010131836,0.0020866394,0.036346436,0.046020508,0.008453369,-0.025985718,0.008644104,0.010925293,0.015136719,-0.019470215,0.011619568,-0.014953613,0.010414124,-0.008476257,-0.014137268,-0.038879395,0.0030536652,0.08972168,-0.0026721954,-0.014175415,-0.012168884,-0.015716553,0.013648987,0.02508545,-0.041870117,-0.00687027,-0.028121948,0.017150879,-0.029510498,0.007904053,0.004436493,0.024490356,-0.016433716,-0.054382324,-0.021270752,-0.009208679,-0.013427734,-0.064331055,-0.031051636,-0.07220459,0.0034122467,-0.011566162,-0.02178955,0.0025558472,0.0044288635,-0.016799927,-0.078125,0.00027370453,0.049591064,0.010887146,0.02407837,-0.0065231323,0.025680542,0.019424438,-0.037872314,0.0018901825,0.028762817,-0.029327393,-0.016998291,-0.018859863,0.016723633,-0.019882202,-0.012748718,0.009124756,0.014381409,0.01675415,-0.011695862,0.0062675476,-0.0059013367,0.023254395,-0.024398804,0.012893677,-0.011352539,-0.009117126,0.035583496,-0.046081543,0.02571106,0.00945282,-0.012168884,0.0057792664,0.027679443,0.040740967,-0.033447266,-0.01725769,0.016708374,0.014701843,0.033294678,-0.023620605,0.041900635,0.012260437,-0.019058228,0.01612854,-0.0055999756,-0.014350891,-0.033721924,-0.028549194,0.020263672,0.0019512177,0.006931305,-0.019165039,0.0030822754,0.012107849,0.0052337646,0.016067505,-0.008842468,-0.02104187,-0.02015686,-0.0043792725,-0.00045132637,0.004711151,-0.0067863464,0.02458191,0.025848389,0.0413208,0.011306763,-0.016311646,0.0059890747,0.032684326,-0.010787964,0.0047454834,0.022964478,0.010734558,0.02230835,0.021820068,0.017089844,-0.044921875,-0.020690918,-0.024856567,-0.018707275,-0.0024471283,-0.006702423,-0.015838623,-0.004131317,0.005180359,-0.0058555603,-0.027191162,0.0010852814,-0.025894165,-0.029296875,-0.006111145,-0.013633728,0.027191162,0.00055265427,0.012763977,0.013420105,-0.0030403137,0.044067383,-0.004096985,-0.011703491,0.034332275,0.024505615,0.014854431,-0.030075073,-0.008399963,-0.014556885,-0.005508423,0.0018091202,-0.036315918,0.009796143,0.049194336,-0.020492554,0.0035114288,0.010299683,0.025268555,-0.003370285,0.00459671,-0.0068893433,0.018951416,-0.004550934,0.035614014,-0.04937744,0.016540527,0.01348114,0.0038547516,-0.007068634,-0.008071899,-0.029067993,0.011398315,0.008239746,-0.008964539,0.056793213,0.0017318726,0.02960205,-0.020935059,-0.023040771,0.0137786865,-0.029220581,-0.02142334,0.024429321,-0.0056495667,0.0026474,0.012130737,-0.024414062,0.032806396,-0.03314209,0.017349243,0.005519867,0.0051574707,-0.00015723705,-0.021957397,-0.0037879944,-0.01751709,-0.017486572,0.0073432922,0.00016820431,0.048736572,0.015586853,0.028121948,0.052001953,0.018310547,-0.0009484291,-0.031585693,-0.031311035,0.0021324158,-0.023422241,0.016235352,-0.012565613,0.06298828,0.035461426,0.0040779114,0.041870117,0.030532837,0.03781128,0.006965637,0.007671356,-0.015777588,0.014404297,-0.0028419495,0.02406311,0.00022149086,0.033203125,-0.034240723,0.03225708,0.0154418945,0.030151367,-0.03817749,0.03265381,0.06335449,0.015434265,-0.01626587,0.0423584,-0.0073776245,-0.011001587,-0.01776123,-0.01574707,0.061431885,0.008415222,0.05206299,0.05331421,0.0137786865,-0.0029029846,0.014778137,-0.025314331,-0.022705078,0.06878662,0.01802063,-0.024612427,-0.010292053,0.0035495758,0.007774353,-0.045837402,-0.02748108,0.023345947,-0.011680603,0.007408142,-0.008682251,-0.008155823,-0.020019531,0.008560181,0.025802612,0.010253906,-0.01940918,0.020736694,0.03643799,-0.0017023087,0.026931763,-0.0068092346,0.026428223,-0.024520874,-0.028625488,0.01398468,0.019714355,-0.007888794,-0.012504578,0.027709961,0.005455017,0.034240723,0.04714966,-0.022659302,0.010040283,0.030197144,0.014442444,-0.005718231,0.059509277,0.037750244,0.013954163,0.04559326,0.02444458,0.03579712,-0.04559326,0.02420044,0.004737854,-0.00049877167,-0.009719849,-0.015991211,0.002418518,-0.012550354,0.014305115,-0.0015306473,-0.011749268,0.023864746,0.02230835,-0.005252838,-0.006454468,-0.007286072,0.010879517,-0.0284729,-0.0032691956,0.009254456,-0.012374878,0.036956787,0.012878418,0.0287323,-0.02330017,0.021881104,-0.00026774406,-0.01222229,0.00050258636,0.021881104,-0.030792236,0.0047073364,-0.0034732819,0.0011014938,-0.052246094,0.011299133,0.028701782,-0.01927185,0.029556274,0.013893127,0.00015294552,-0.004928589,0.026260376,0.011070251,0.00034856796,-0.006965637,-0.021270752,0.026657104,0.046875,-0.0037593842,0.0014009476,-0.028503418,-0.0062332153,0.009140015,-0.010871887,-0.008354187,-0.0074653625,-0.018341064,-0.026855469,0.01687622,0.033966064,0.018249512,0.060333252,-0.022201538,-0.011299133,0.00970459,0.032287598,0.0022583008,0.0020008087,0.0009531975,0.01525116,-0.014984131,0.051727295,0.026931763,0.012893677,0.03527832,-0.003982544,-0.016525269,0.011856079,-0.008865356,0.023712158,-0.011062622,0.008308411,-0.0033740997,0.027008057,-0.016098022,-0.03894043,0.008178711,-0.01940918,-0.025817871,-0.021820068,0.0178833,0.0007958412,0.028656006,0.038513184,0.028686523,-0.023986816,0.05822754,-0.018295288,0.051727295,0.0007352829,-0.008491516,0.052703857,0.0158844,0.03567505,0.025375366,0.021575928,-0.036010742,0.018600464,0.03540039,0.022476196,0.01335144,0.00466156,-0.014633179,0.040802002,0.004962921,0.02293396,-0.0077819824,-0.0024471283,0.013252258,-0.0015459061,-0.0124053955,-0.009841919,-0.005718231,0.0109939575,0.049316406,-0.027297974,-0.019210815,-0.030563354,-0.011734009,0.024032593,-0.019454956,0.003955841,0.0061950684,-0.02267456,0.011367798,-0.026290894,-0.032836914,-0.000058054924,0.026504517,-0.050476074,-0.012039185,0.0024852753,0.017669678,-0.017730713,0.030426025,0.019897461,-0.00258255,0.010650635,0.041778564,-0.007080078,0.032043457,-0.016098022,0.024276733,0.029251099,0.004722595,-0.016143799,-0.0046539307,0.009231567,-0.011749268,0.010108948,0.038085938,-0.009086609,0.0031661987,-0.0018405914,-0.00541687,-0.0014877319,0.0076522827,-0.00497818,0.010368347,-0.01234436,-0.01146698,0.002456665,0.00919342,-0.0051002502,0.0052719116,-0.0103302,-0.016418457,0.006549835,0.03366089,0.018493652,-0.037475586,-0.0014381409,0.0050201416,0.00983429,-0.02027893,-0.007858276,-0.0016498566,-0.037322998,0.018859863,0.015792847,0.012489319,0.011802673,-0.024307251,0.0023384094,0.025238037,0.013198853,0.020568848,0.0015211105,0.0036907196,0.012039185,-0.010284424,-0.0035209656,-0.004096985,-0.013053894,0.011070251,0.019866943,0.001786232,-0.034729004,0.019897461,-0.000014483929,0.016662598,-0.0025138855,-0.015525818,0.012161255,-0.01146698,0.0012693405,0.00058078766,0.0113220215,-0.013328552,-0.011497498,-0.0093307495,0.035614014,0.058441162,-0.0105896,-0.008079529,0.026733398,0.012802124,0.017440796,0.0357666,0.0033740997,0.04071045,0.02470398,-0.017852783,-0.0234375,0.029266357,-0.014251709,-0.025741577,0.020202637,-0.01638794,-0.011505127,0.01777649,0.0068893433,-0.0030231476,-0.030044556,-0.0124435425,-0.011375427,-0.017150879,0.022644043,-0.01449585,0.013710022,-0.021072388,-0.0050086975,0.0047836304,-0.028198242,-0.050933838,-0.026000977,-0.008033752,-0.008270264,-0.05618286,0.002626419,-0.027816772,0.0126571655,-0.029144287,-0.0069274902,-0.0138168335,0.018661499,-0.018661499,-0.0052719116,0.0035152435,0.021896362,0.027145386,0.0026016235,0.022628784,-0.037963867,-0.02230835,-0.025909424,0.011222839,-0.005908966,0.022247314,0.0033740997,0.040283203,0.028060913,-0.010948181,-0.0057907104,-0.01171875,-0.007736206,-0.013687134,-0.015838623,-0.025756836,0.020370483,0.012664795,-0.010093689,-0.0124053955,0.040130615,-0.030578613,-0.020767212,0.028762817,0.041229248,0.01222229,0.023208618,-0.016845703,-0.0071372986,-0.019805908,0.0038204193,-0.013748169,0.011711121,0.009132385,0.0011119843,-0.00415802,0.004081726,0.02178955,-0.0016870499,-0.0055770874,0.031097412,0.004886627,-0.0056915283,0.03555298,0.010505676,0.005645752,-0.012367249,-0.009613037,0.023391724,0.04824829,0.00969696,0.0033740997,-0.0032520294,0.0020771027,-0.010627747,0.011299133,0.021530151,-0.021575928,-0.045166016,-0.021316528,-0.031951904,0.016448975,0.0024528503,0.011512756,-0.009880066,0.019546509,-0.020843506,-0.025802612,-0.020477295,0.030792236,0.013053894,-0.010559082,-0.008125305,0.012084961,0.015548706,-0.03527832,0.0036468506,-0.054656982,-0.03387451,-0.0025138855,-0.022766113,0.027572632,0.010818481,-0.010734558,0.0031089783,-0.005470276,-0.0021705627,-0.00084114075,0.026351929,-0.008552551,-0.003282547,0.031280518,0.01852417,-0.018341064,0.020401001,-0.005908966,0.0015764236,0.015930176,-0.0141067505,0.012535095,-0.015701294,0.028915405,-0.009002686,-0.0061187744,0.03012085,-0.0072021484,0.011520386,-0.03781128,0.00843811,-0.003206253,-0.007736206,0.031982422,-0.031677246,-0.02406311,0.010246277,-0.020553589,-0.025131226,0.0009727478,0.014854431,0.031707764,-0.016296387,0.04800415,-0.01625061,-0.00831604,0.017211914,0.012420654,-0.014778137,0.0065460205,0.032440186,0.0038070679,-0.012680054,-0.0031909943,-0.014251709,-0.032287598,-0.00687027,0.017807007,-0.009162903,-0.008041382,0.027038574,0.013633728,0.043151855,-0.0021877289,0.018341064,0.006504059,0.007003784,0.023910522,0.0024490356,0.062286377,-0.005088806,-0.02835083,0.004787445,0.0016069412,-0.017532349,0.0026054382,-0.011756897,-0.0022678375,-0.03677368,0.012573242,-0.0028438568,0.022964478,-0.023864746,0.01134491,-0.021377563,-0.0033893585,-0.03942871,-0.0065689087,-0.027633667,0.012008667,0.026367188,0.00422287,0.020996094,-0.0003015995,-0.021087646,0.023849487,0.044006348,-0.012054443,-0.030349731,-0.011886597,0.006919861,-0.00087070465,0.016601562,0.0022010803,-0.022766113,-0.016479492,0.009246826,-0.017684937,0.00466156,-0.0032176971,0.015853882,0.006702423,-0.0017738342,-0.010002136,0.026672363,-0.0075035095,-0.0048599243,0.011024475,0.0068092346,0.036743164,0.03137207,-0.014472961,0.02218628,0.017333984,-0.04168701,0.059051514,-0.002981186,0.027069092,-0.019042969,0.0000044107437,-0.03552246,-0.018218994,-0.025146484,0.0013866425],"createdAt":"2026-04-18T18:49:52.921Z","updatedAt":"2026-04-22T09:01:16.603Z","lastSeenAt":"2026-04-22T09:01:16.603Z","tsv":"'/api/v1/payments/223':57,188 '/request':13,28,148 '0.02':12,27,74,147 '000':68 '20':67 '402':199 'Base network API' 'USDC API' 'accept':46 'access':62,88,218 'across':104 'actual':190 'advertis':79 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,81,158,217 'attach':91 'base':8,23,51,69 'beyond':213 'broader':100 'call':4,19,76 'caller':89 'categori':106 'challeng':200 'charg':64 'classif':121 'connect':167 'content':173 'convers':138 'crypto pay-per-use' 'data':107,111,208 'descript':184 'doc':157 'document':152,203 'embed':122 'endpoint':55,103,141,189,193 'estim':132 'exampl':181 'exchang':127 'export':112 'extrem':154 'feed':126 'financ':123 'four':105 'function':210 'gas':131 'generat':139 'generic':215 'geocod':136 'header':95 'howev':151 'http-post' 'i.e':73 'infrastructur':134 'insight':113 'instant':87 'key':82 'label':59,219 'learn':116 'limit':85 'list':143 'live':195 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':102 'openapi':177 'page':162 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,94 'per':3,18,36,75 'platform':6,21,39,78,101 'point':150 'premium':60,216 'price':125,149,159 'prompt':169 'protocol':44 'provid':212 'quot':130 'rate':84,128 'readm':161 'render':164 'report':110 'request':37,98 'request/response':180 'return':191,196 'schema':178 'sentiment':117 'simpli':90 'specif':54 'summar':120 'text':119 'thin':155 'token':129 'unclear':206 'unit':70 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':135 'valid':137,198 'via':10,25 'wallet':168 'web3':124 'without':202 'x402':11,26,43,93 'x402 API' 'x402-payment'","prices":[{"id":"52268545-53ad-41b1-9ed3-781a07954a79","listingId":"4360cda5-fd32-450d-b52e-d3e6e0bb9145","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/payments/223","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:52.921Z"}],"sources":[{"listingId":"4360cda5-fd32-450d-b52e-d3e6e0bb9145","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/223","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:52.921Z","lastSeenAt":"2026-04-22T09:01:16.603Z"}],"details":{"listingId":"4360cda5-fd32-450d-b52e-d3e6e0bb9145","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/223 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/223"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/223"}],"useCases":["Programmatic access to API services without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.681Z"},"updatedAt":"2026-04-22T09:01:16.603Z"}}