{"id":"2142e981-45d5-4db9-a8ba-4415ba8a8029","shortId":"xaMsZe","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/inbox/185` 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 no minimum commitments.\n\nImportant caveat: the `/api/v1/inbox/185` path does not clearly map to any of the named endpoints on the landing page. Its exact functionality is undocumented — the x402 challenge confirms it is live and accepts POST requests returning application/json, but there is no OpenAPI schema, request/response examples, or detailed documentation available. The /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The /api/v1/inbox/185 path does not correspond to any documented endpoint on the landing page — its actual functionality is unknown.","No OpenAPI schema, request examples, or response examples are available.","The /pricing, /api, and /README pages contain no useful content beyond a wallet-connect prompt.","The platform's claimed capabilities (AI, analytics, finance, etc.) cannot be verified for this specific endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/185","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/185","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the inbox/185 path is unexplained. The /api, /pricing, and /README pages are empty. 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":"2026-04-22T00:18:48.768Z","embedding":[-0.030715942,-0.015319824,0.039794922,0.027267456,0.024734497,-0.043548584,-0.015174866,0.028533936,0.07940674,-0.05807495,0.017944336,-0.042510986,-0.020095825,-0.019012451,-0.022903442,0.011604309,0.0039634705,0.0068740845,-0.040405273,0.032989502,0.015808105,-0.014533997,-0.026992798,0.0345459,-0.0041503906,-0.030960083,-0.0077781677,-0.01878357,-0.015945435,-0.047424316,0.05392456,-0.025421143,0.0016069412,0.010986328,-0.01461792,-0.006374359,0.0005440712,0.036590576,0.024658203,-0.003030777,-0.026153564,-0.042144775,0.016296387,-0.023544312,-0.057556152,0.0016202927,0.005973816,-0.013427734,0.011138916,0.007534027,-0.025894165,0.005218506,0.0010566711,0.011634827,0.021362305,0.0053749084,0.010246277,0.0022182465,0.01725769,0.02268982,-0.004623413,-0.06323242,-0.023284912,-0.003993988,-0.0013637543,0.05038452,-0.005115509,0.048309326,0.0042419434,0.078552246,0.024032593,0.0418396,0.023468018,0.006954193,0.0040359497,-0.020019531,0.0007972717,0.05670166,-0.02104187,-0.022354126,-0.009887695,-0.011459351,-0.05734253,-0.012924194,-0.013961792,-0.042541504,-0.011482239,0.026931763,-0.030181885,0.023040771,-0.079711914,-0.03137207,-0.012771606,0.0063171387,0.0018186569,-0.013435364,0.0075263977,0.01234436,-0.006465912,0.03189087,0.001742363,-0.05230713,0.019744873,-0.0032424927,0.044830322,0.037841797,0.021224976,0.011421204,0.021713257,-0.003414154,-0.052764893,0.01424408,-0.035003662,-0.014427185,0.0017623901,0.005180359,0.0017871857,0.023010254,-0.038391113,0.009109497,-0.042633057,0.044921875,0.0027770996,0.016830444,0.0011882782,-0.054107666,-0.010032654,0.0054779053,-0.038970947,-0.008743286,0.017791748,0.014732361,0.025512695,-0.015266418,-0.04827881,-0.0065841675,-0.01966858,-0.0126571655,-0.04046631,-0.029953003,0.049072266,-0.030685425,0.011146545,0.022277832,-0.092285156,-0.009376526,-0.04147339,-0.002960205,-0.011039734,-0.007247925,-0.0049934387,0.03918457,-0.022094727,-0.0345459,-0.01838684,-0.017868042,0.021148682,0.03213501,-0.0155181885,0.04827881,-0.021102905,0.011367798,0.023086548,-0.0073280334,0.008384705,0.019821167,0.00071048737,-0.09362793,-0.076660156,-0.01576233,0.0016183853,-0.015213013,-0.025405884,0.0012454987,-0.008758545,-0.05493164,-0.021957397,-0.012718201,0.005130768,-0.040649414,0.014442444,-0.016281128,0.021102905,-0.024490356,-0.044891357,-0.015991211,-0.016311646,0.054229736,0.0116119385,0.033691406,0.026641846,-0.025436401,0.06384277,0.050689697,-0.027740479,-0.023345947,0.023208618,-0.024490356,0.016937256,0.007865906,0.0059928894,-0.04458618,0.03665161,0.07824707,-0.006801605,-0.009361267,-0.009086609,-0.035827637,-0.044311523,-0.02999878,0.027572632,0.0099105835,-0.008674622,0.03579712,-0.04171753,-0.052337646,-0.021453857,0.009208679,0.015090942,0.062805176,0.014213562,0.017501831,0.008651733,0.02230835,-0.03555298,0.03527832,0.03475952,-0.003019333,-0.024002075,-0.010375977,0.03173828,0.040863037,-0.0073928833,0.012420654,-0.0016775131,0.029525757,-0.013656616,0.0030555725,0.019180298,0.0023975372,-0.015014648,-0.023162842,-0.028671265,0.010360718,0.009155273,-0.023788452,-0.026763916,-0.08532715,0.046691895,0.027954102,0.044128418,0.01184082,0.0031929016,-0.022720337,0.006011963,-0.060272217,0.056640625,0.05935669,0.0033092499,-0.017181396,0.026062012,-0.021575928,-0.022369385,0.024368286,-0.002916336,-0.04144287,-0.007598877,0.0105896,-0.05404663,-0.0062294006,0.0019798279,0.028823853,0.061584473,-0.0018367767,-0.04559326,-0.0138168335,-0.014465332,-0.023269653,-0.024291992,0.010025024,-0.023925781,-0.0011949539,0.01864624,-0.008384705,0.014480591,-0.0020275116,0.01235199,-0.011039734,0.010864258,-0.022964478,-0.03668213,0.015777588,0.0024642944,-0.040924072,0.0034999847,-0.008415222,0.068115234,-0.047332764,0.031982422,-0.013168335,0.014282227,0.027893066,0.012619019,-0.05847168,0.0049743652,0.02067566,0.026184082,0.059143066,0.011505127,-0.0317688,-0.025299072,0.07678223,-0.013328552,-0.0034236908,0.013908386,-0.0010967255,0.022262573,-0.011962891,-0.057281494,-0.03643799,-0.0070266724,-0.028137207,0.02305603,-0.01965332,0.029754639,-0.0057029724,0.025985718,-0.012886047,-0.005783081,-0.027816772,0.02810669,-0.037719727,0.0064048767,-0.01927185,-0.031829834,0.018035889,0.008453369,-0.0043640137,-0.0124053955,0.035461426,0.030639648,-0.007698059,-0.040924072,-0.026290894,-0.023956299,-0.014625549,0.015068054,0.02835083,0.022888184,0.045013428,-0.0335083,0.0014333725,0.04458618,0.0085372925,0.04272461,0.0033073425,-0.0009608269,-0.08728027,-0.049682617,-0.01637268,-0.041748047,0.012290955,0.016860962,0.0029659271,0.050964355,0.008163452,-0.039367676,-0.070007324,0.036743164,-0.05432129,0.022399902,0.040802002,-0.013542175,-0.024536133,0.0011281967,-0.0070533752,0.010353088,0.031982422,0.015052795,0.02835083,0.086120605,0.044067383,-0.003709793,0.016693115,0.01576233,0.028671265,0.004722595,-0.01663208,-0.024658203,0.001086235,0.036590576,-0.026794434,-0.022506714,-0.07562256,0.054534912,0.038238525,0.082092285,0.020874023,0.012771606,0.033843994,-0.0029582977,0.0018396378,-0.03488159,-0.02444458,-0.03616333,-0.04348755,0.042541504,-0.02116394,0.0115356445,-0.02557373,0.040100098,-0.015853882,0.022720337,-0.01739502,0.037963867,-0.009681702,0.0053863525,0.010513306,0.012794495,0.052581787,0.062438965,-0.042877197,0.026748657,0.027374268,-0.029525757,0.01965332,0.03564453,-0.009750366,-0.0033874512,-0.07080078,-0.036590576,-0.0079422,-0.010940552,-0.04989624,0.01259613,-0.007904053,0.01763916,0.029891968,0.0008325577,-0.0020713806,-0.008255005,-0.020523071,-0.05899048,0.00617218,-0.04849243,0.0064315796,0.03363037,-0.031097412,-0.017532349,-0.003118515,-0.015991211,-0.013015747,0.012237549,0.03845215,-0.003932953,-0.048309326,0.032806396,-0.0027427673,0.0043678284,0.018875122,0.034179688,0.008934021,0.02696228,0.055145264,0.0085372925,-0.018081665,-0.05392456,0.035736084,-0.05142212,0.0006752014,0.026184082,-0.030563354,0.01348114,-0.0015354156,-0.047027588,-0.025390625,0.014266968,-0.017349243,-0.01586914,0.015670776,-0.018157959,-0.024993896,-0.052642822,-0.019836426,0.013786316,0.07110596,0.015991211,0.003189087,-0.05102539,0.0021133423,0.01134491,0.0054893494,0.04046631,-0.015159607,-0.016326904,-0.018692017,-0.029571533,-0.012519836,-0.0073547363,0.030075073,0.006664276,-0.0053215027,0.028808594,0.011451721,0.01638794,0.0031719208,-0.003446579,0.014511108,-0.03100586,-0.015930176,-0.002855301,0.04107666,0.012687683,-0.014961243,-0.039123535,0.038879395,0.023101807,0.034454346,-0.021835327,-0.013267517,-0.014030457,0.019104004,0.020019531,-0.020370483,-0.008377075,0.004524231,-0.06036377,-0.06958008,0.03945923,-0.02229309,0.019317627,0.022781372,0.016235352,0.016052246,-0.016830444,0.019851685,0.005218506,-0.030349731,-0.0040512085,-0.018676758,-0.012802124,-0.010719299,-0.0032024384,-0.0045928955,0.021942139,-0.00957489,0.0158844,0.004673004,-0.011398315,0.03353882,0.0011816025,-0.0027065277,0.027450562,-0.00009602308,0.03302002,0.038391113,0.012039185,-0.044555664,0.031982422,-0.009002686,0.023223877,-0.0016307831,0.04385376,0.044647217,0.016815186,-0.01979065,-0.008766174,-0.022903442,-0.024673462,0.007205963,0.0032520294,0.015960693,-0.013977051,-0.053619385,0.018676758,0.0066070557,-0.046661377,-0.03652954,0.023254395,0.008255005,-0.045288086,0.0124053955,0.019515991,0.05142212,-0.026870728,0.02305603,0.005077362,0.037628174,0.035980225,0.00018239021,-0.008285522,0.019424438,-0.00730896,0.005908966,-0.009750366,-0.004764557,0.020706177,0.0049324036,0.024520874,0.035064697,0.012077332,-0.015037537,-0.035308838,0.0068893433,-0.015304565,-0.019821167,0.0178833,0.025527954,0.026260376,-0.028274536,0.017471313,0.009971619,-0.022018433,-0.0054969788,-0.014457703,0.026489258,-0.001452446,-0.0024032593,0.025817871,0.009887695,0.014030457,-0.045013428,-0.00484848,0.009765625,0.004928589,-0.032287598,-0.04788208,-0.054992676,0.0011005402,0.017288208,0.007751465,0.030929565,0.03314209,-0.000034809113,-0.00045871735,0.01777649,0.012290955,-0.023483276,-0.013496399,-0.036743164,-0.024658203,-0.009963989,0.007926941,-0.03756714,0.021362305,0.001490593,-0.023834229,-0.0053367615,-0.009185791,0.00074863434,-0.0058135986,0.00073862076,0.05343628,0.0066337585,0.024429321,-0.009849548,-0.032592773,-0.012336731,-0.0030326843,0.036254883,-0.04724121,0.028915405,-0.0015001297,-0.0024490356,-0.0017557144,0.0016069412,0.013710022,0.03074646,0.016448975,0.027282715,-0.04107666,0.055358887,-0.019073486,0.013839722,-0.0009264946,-0.021652222,-0.0041885376,-0.026016235,-0.0057868958,0.037353516,-0.030212402,-0.026062012,-0.025146484,-0.027175903,-0.004020691,-0.048919678,0.018081665,0.03491211,0.03591919,-0.033935547,0.013267517,0.011146545,0.0049057007,-0.009132385,-0.0019626617,-0.005130768,0.016540527,0.024887085,-0.0023212433,-0.012039185,-0.019210815,-0.02809143,-0.0014419556,-0.047302246,-0.057006836,-0.00712204,0.0049057007,-0.00299263,-0.016143799,-0.024963379,-0.039245605,0.008972168,-0.036346436,0.014266968,-0.008148193,0.013961792,-0.008094788,-0.032043457,0.0005097389,0.019500732,-0.0044555664,0.040527344,0.013786316,-0.0029182434,-0.02909851,0.02178955,0.019958496,0.0029315948,-0.0053482056,-0.021484375,-0.007080078,-0.03604126,-0.058685303,-0.006099701,-0.013961792,-0.010726929,-0.016815186,0.009475708,-0.045440674,0.011474609,-0.014137268,-0.008956909,0.025802612,0.004142761,-0.010925293,-0.019058228,0.018630981,-0.0020523071,-0.01550293,-0.02558899,0.015556335,0.01121521,-0.00009679794,0.03756714,0.04751587,0.0013399124,-0.027374268,0.024154663,0.0007185936,0.012435913,-0.013214111,0.005470276,-0.018127441,-0.003156662,-0.015388489,-0.009628296,-0.033966064,-0.002313614,0.082458496,0.0062713623,0.00026273727,-0.021347046,-0.013923645,0.006881714,0.024169922,-0.03555298,0.0019817352,-0.0335083,0.007972717,-0.030349731,0.03111267,0.004673004,0.02696228,-0.014717102,-0.043273926,-0.011367798,0.0031032562,-0.0038967133,-0.05722046,-0.016708374,-0.0619812,0.018463135,-0.015945435,-0.038757324,0.0002617836,0.0022144318,-0.009757996,-0.08538818,0.0063705444,0.041015625,0.0015773773,0.031982422,0.0023059845,0.019851685,0.011802673,-0.019821167,0.010131836,0.01928711,-0.03186035,-0.018218994,-0.014564514,0.024887085,0.004425049,-0.012001038,0.012123108,0.0054740906,0.017440796,-0.01108551,0.025100708,0.00019705296,0.014533997,-0.032714844,0.02015686,-0.012130737,-0.007320404,0.039031982,-0.051574707,0.022033691,0.014678955,-0.0006966591,-0.008674622,0.028320312,0.03878784,-0.028823853,-0.016448975,0.007411957,0.001373291,0.026229858,-0.023880005,0.04724121,0.012870789,-0.026535034,0.016433716,-0.005458832,-0.005180359,-0.025024414,-0.021606445,0.022018433,-0.011138916,0.008071899,-0.011146545,-0.0023765564,0.016571045,-0.008460999,0.014053345,-0.011856079,-0.018859863,-0.012336731,-0.0041999817,-0.0044021606,0.012039185,0.00024557114,0.020126343,0.029281616,0.02784729,-0.0010900497,-0.016662598,-0.002500534,0.032958984,0.0031967163,0.00869751,0.0357666,0.015411377,0.010826111,0.012886047,0.0071029663,-0.04660034,-0.002626419,-0.017791748,-0.008743286,0.004383087,-0.02041626,-0.0079574585,0.005054474,0.0021362305,-0.012161255,-0.030776978,0.0010118484,-0.021774292,-0.023925781,0.0006093979,-0.012069702,0.029754639,0.0029888153,0.0030078888,0.014053345,-0.00223732,0.031463623,-0.0009665489,-0.02810669,0.031066895,0.025527954,0.018859863,-0.03942871,-0.022079468,-0.005443573,0.006298065,0.003080368,-0.035888672,0.006336212,0.043518066,-0.01486969,0.008857727,-0.00881958,0.031585693,-0.009391785,0.01689148,-0.013206482,0.016860962,-0.009124756,0.027160645,-0.03540039,0.022140503,0.026443481,0.013671875,-0.017868042,-0.021835327,-0.032348633,0.02519226,-0.00010877848,-0.0073013306,0.05319214,0.011146545,0.022720337,-0.020095825,-0.018981934,0.002670288,-0.034820557,-0.022994995,0.02330017,0.0015907288,0.008232117,0.0041236877,-0.022567749,0.025924683,-0.026763916,0.012718201,0.0033416748,0.0027446747,-0.0059928894,-0.023468018,-0.008476257,0.009605408,-0.027160645,-0.008796692,0.0007414818,0.053833008,0.024032593,0.04714966,0.040283203,-0.00043058395,-0.005996704,-0.043395996,-0.026992798,0.0098724365,-0.021743774,0.021774292,-0.017150879,0.066345215,0.045806885,-0.01020813,0.034210205,0.043548584,0.048095703,-0.0023727417,0.019332886,-0.023849487,0.0038871765,-0.0018014908,0.026809692,-0.0037956238,0.04055786,-0.02659607,0.025634766,0.03250122,0.027023315,-0.02909851,0.03479004,0.06677246,0.009811401,0.004837036,0.010894775,0.0000022649765,-0.012458801,-0.00630188,-0.02848816,0.051879883,0.008872986,0.06896973,0.03942871,0.0064353943,-0.0038204193,0.01977539,-0.035461426,-0.014785767,0.06021118,0.021987915,-0.012130737,-0.013153076,0.0012044907,-0.0027103424,-0.03942871,-0.030471802,0.02355957,-0.011444092,0.011604309,-0.016601562,0.006462097,-0.015701294,0.010192871,0.011528015,0.00844574,0.0008792877,0.029418945,0.021209717,0.008132935,0.043273926,-0.0036029816,0.0309906,-0.029953003,-0.028030396,0.01953125,0.0101623535,-0.007835388,-0.0038757324,0.039916992,-0.0036907196,0.04043579,0.03363037,-0.0128479,0.012321472,0.026397705,0.0054969788,-0.0057868958,0.0690918,0.036132812,0.010055542,0.028167725,0.026016235,0.03765869,-0.01878357,0.027633667,0.00007092953,0.0039978027,-0.010932922,-0.01777649,0.00033712387,-0.0059127808,0.020492554,-0.0008535385,-0.016525269,-0.0006608963,0.023834229,-0.0031108856,-0.0049705505,-0.0023288727,-0.0036830902,-0.01285553,-0.0054359436,0.011421204,-0.03111267,0.021652222,0.008514404,0.026306152,-0.009674072,0.003211975,-0.0046691895,-0.013442993,-0.0055274963,0.027679443,-0.027130127,0.011016846,0.0036964417,-0.0068206787,-0.056610107,0.018157959,0.015281677,-0.012306213,0.024917603,0.0135650635,-0.01939392,0.011253357,0.010139465,-0.0018100739,0.0078048706,-0.010932922,-0.021469116,0.027038574,0.03982544,0.005962372,0.0054016113,-0.02709961,-0.013092041,0.007713318,-0.0027675629,-0.01890564,-0.0019626617,-0.0022239685,-0.033111572,0.010246277,0.024230957,0.027236938,0.042816162,-0.0158844,-0.013168335,0.0050354004,0.028884888,0.0017518997,0.0060272217,-0.0013551712,0.016052246,-0.018569946,0.038635254,0.048583984,0.016708374,0.052886963,-0.006828308,-0.0071144104,-0.003917694,-0.018341064,0.012435913,-0.027526855,0.0004787445,-0.0030841827,0.035491943,-0.014785767,-0.03756714,0.0073127747,-0.008277893,-0.029342651,-0.015083313,0.013160706,0.0034313202,0.036132812,0.039916992,0.016693115,-0.02809143,0.059631348,-0.012901306,0.048309326,0.0030879974,-0.019714355,0.06100464,0.034942627,0.023971558,0.012191772,0.012634277,-0.047180176,0.010269165,0.039794922,0.027923584,0.025253296,-0.005329132,-0.010643005,0.03253174,-0.0027809143,0.018112183,-0.0072669983,-0.00015687943,0.017730713,-0.0055732727,-0.004764557,-0.003332138,0.003566742,0.0009393692,0.036315918,-0.025802612,-0.007255554,-0.027709961,-0.011566162,0.03479004,-0.0064086914,-0.0054855347,-0.0050582886,-0.01991272,0.006416321,-0.017196655,-0.025802612,0.0076446533,0.02041626,-0.04650879,-0.008628845,0.019989014,0.0018920898,-0.020233154,0.04434204,0.021499634,-0.0041275024,0.008972168,0.037750244,-0.015731812,0.013137817,-0.021881104,0.027526855,0.04058838,0.0067443848,-0.020446777,-0.011924744,0.0073547363,-0.0075531006,0.017181396,0.03387451,0.0011577606,0.0037002563,-0.008285522,-0.008056641,0.00084400177,0.003440857,-0.0126953125,0.010955811,-0.012062073,-0.011741638,-0.002368927,0.0011930466,0.009613037,0.006000519,-0.02218628,-0.018081665,0.012329102,0.048980713,0.029678345,-0.040985107,-0.006500244,0.00047326088,0.0047683716,-0.026855469,-0.0073127747,-0.008552551,-0.030212402,0.01626587,0.018737793,0.011291504,0.02168274,-0.021621704,0.004917145,0.025604248,0.009864807,0.009399414,0.00554657,-0.01940918,0.0016374588,-0.00970459,-0.007865906,-0.015670776,-0.0060310364,0.0074005127,0.016540527,0.007255554,-0.025421143,0.027664185,-0.006690979,0.023956299,-0.008216858,0.000115811825,0.027770996,0.0036563873,-0.014373779,0.0024108887,0.012809753,-0.017440796,-0.005207062,-0.028137207,0.01889038,0.049560547,-0.0034942627,0.0058135986,0.02420044,0.019134521,0.020568848,0.04360962,0.0035705566,0.037353516,0.028198242,-0.0234375,-0.027160645,0.017425537,-0.013015747,-0.024353027,0.02041626,-0.01902771,-0.029418945,0.009666443,0.004043579,0.005054474,-0.026870728,-0.0041007996,-0.023086548,-0.030883789,0.018188477,-0.012237549,0.011528015,-0.010887146,-0.016296387,0.001244545,-0.02305603,-0.057495117,-0.013938904,-0.0034713745,-0.003686905,-0.070739746,0.0011606216,-0.031311035,0.016204834,-0.019607544,-0.009338379,-0.020385742,0.017333984,-0.009773254,-0.0030059814,-0.009597778,0.026535034,0.025527954,0.01499939,0.026535034,-0.035827637,-0.04248047,-0.010391235,0.004764557,0.004776001,0.021362305,0.0050315857,0.033233643,0.017471313,-0.017974854,0.0050849915,-0.012123108,-0.004184723,-0.022888184,-0.022613525,-0.032470703,0.020812988,0.016662598,-0.014015198,0.0005197525,0.033569336,-0.018630981,-0.008415222,0.02168274,0.035949707,0.010894775,0.019821167,-0.019882202,-0.006011963,-0.018249512,0.0027256012,-0.02218628,0.015930176,0.0010185242,0.014442444,-0.01826477,0.022247314,0.03173828,-0.0061302185,-0.005504608,0.018447876,0.0011491776,-0.014190674,0.030426025,0.008926392,0.0053482056,-0.018493652,-0.0060043335,0.02079773,0.064086914,0.026031494,0.014625549,0.0014324188,0.006362915,-0.015533447,-0.0020275116,0.0016670227,-0.03225708,-0.033172607,-0.010551453,-0.015670776,0.012817383,-0.010749817,0.014518738,-0.0071868896,0.023788452,-0.011177063,-0.020843506,-0.026489258,0.037322998,-0.0034599304,-0.0072402954,-0.006252289,0.015960693,0.009475708,-0.021896362,-0.0014457703,-0.03277588,-0.047943115,-0.00078201294,-0.015640259,0.025100708,0.008972168,-0.01083374,0.0015764236,-0.0037002563,0.007472992,-0.010734558,0.020492554,-0.021118164,-0.0034542084,0.015609741,0.013244629,-0.021591187,0.019973755,-0.015609741,-0.010696411,0.0043754578,-0.01461792,0.013908386,-0.013832092,0.03857422,0.0012311935,0.0010766983,0.035888672,-0.011680603,0.004497528,-0.029434204,0.018112183,-0.0021972656,-0.014587402,0.03881836,-0.019683838,-0.011146545,-0.015792847,-0.007381439,-0.0058135986,0.0135650635,0.01689148,0.024887085,-0.00434494,0.049560547,-0.024139404,0.001742363,0.017227173,0.018081665,-0.024917603,0.0031013489,0.028747559,0.0079956055,-0.0034599304,-0.008605957,-0.007686615,-0.037078857,-0.005470276,0.011238098,0.0071868896,-0.0045280457,0.022247314,-0.0030879974,0.03970337,-0.0037498474,0.008796692,0.015396118,0.014266968,0.03036499,0.0066566467,0.028381348,-0.0050582886,-0.012413025,-0.004501343,-0.0014247894,-0.02545166,0.00032496452,-0.0011234283,0.0006752014,-0.031982422,0.012329102,-0.006313324,0.02470398,-0.022506714,0.013893127,-0.024993896,-0.0012435913,-0.040405273,-0.01663208,-0.034118652,-0.0018005371,0.02810669,-0.0017337799,0.033325195,-0.003944397,-0.0129852295,0.024017334,0.043548584,-0.00033926964,-0.024414062,-0.015686035,0.0013484955,-0.0005764961,0.016082764,0.008049011,-0.02696228,-0.022918701,0.003282547,-0.026443481,0.013496399,-0.006919861,0.013374329,0.008232117,0.005340576,-0.014190674,0.018157959,-0.006881714,-0.011253357,0.009124756,0.0045433044,0.023666382,0.03036499,-0.004383087,0.026260376,0.022827148,-0.040252686,0.065979004,0.009117126,0.03567505,-0.019882202,0.010093689,-0.026382446,-0.031204224,-0.00995636,0.0043754578],"createdAt":"2026-04-21T18:32:31.852Z","updatedAt":"2026-04-22T04:02:46.283Z","lastSeenAt":"2026-04-22T04:02:46.283Z","tsv":"'/api':231 '/api/v1/inbox/185':69,184 '/pricing':232 '/readme':234 '/request':19,38,169 '0.02':18,37,80,168 '000':84 '20':83 '402 payment api' '6':90 'accept':213 'access':75 'account':102 'addit':246 'advertis':125 'ai':12,31,136 'analysi':140 'analyt':130 'api':5,24,45,74,100 'application/json':217 'attach':108 'avail':229 'base':8,27,63,85 'base network api' 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':128 'caveat':182 'challeng':207 'claim':173 'classif':143 'clear':188 'commit':180 'confirm':208 'connect':241 'content':247 'convers':160 'cost':77 'data':11,30,129,133 'decim':91 'detail':227 'document':228 'embed':144 'enabl':44 'endpoint':16,35,57,67,127,164,195 'estim':154 'exact':201 'exampl':225 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'four':126 'function':202 'gas':153 'generat':161 'geocod':158 'handl':94 'header':113 'import':181 'infrastructur':156 'insight':135 'json-response' 'key':101 'land':198 'learn':138 'limit':176 'list':71,163 'live':211 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'map':189 'metric':131 'micropayment api' 'minim':240 'minimum':179 'name':194 'network':64 'no-api-key' 'offer':10,29 'openapi':222 'page':199,235 'path':185 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,118 'per':3,22,55,81 'platform':6,25,46,124,172 'post':214 'post-method' 'premium':73 'price':147,170 'prompt':243 'protocol':98 'provid':48 'quot':152 'rate':150,175 'report':132 'request':56,121,215 'request/response':224 'requir':106 'resolv':237 'return':216 'schema':223 'sentiment':139 'settl':58 'share':165 'sign':116 'specif':66 'subscript':104 'summar':142 'text':141 'token':151 'undocu':204 'unit':86 'usdc':9,28,60,88,117 'usdc api' 'usdc-base-network' 'util':15,34,157 'valid':159 'via':95 'wallet':242 'web3':146 'wider':123 'x':111 'x-payment':110 'x402':43,97,206 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"43796c18-033c-4d6a-99ac-1255bf3ab551","listingId":"2142e981-45d5-4db9-a8ba-4415ba8a8029","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/185","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.852Z"}],"sources":[{"listingId":"2142e981-45d5-4db9-a8ba-4415ba8a8029","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/185","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.852Z","lastSeenAt":"2026-04-22T04:02:46.283Z"}],"details":{"listingId":"2142e981-45d5-4db9-a8ba-4415ba8a8029","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/185 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/185"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/185"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API content with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC transactions on Base","Use cases requiring no-signup, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume batch processing where per-call fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.871Z"},"updatedAt":"2026-04-22T04:02:46.283Z"}}