{"id":"32cc4af9-d7fa-4952-a9af-0ecb05688f58","shortId":"c25dDS","kind":"x402","title":"x402-gated premium API endpoint on Base, payable in USDC at $0.02 per call.","tagline":"x402-gated premium API endpoint on Base, payable in USDC at $0.02 per call.","description":"This x402-protocol endpoint at lowpaymentfee.com provides a pay-per-call \"Premium API Access\" service. Each request is gated by an x402 payment challenge requiring 20,000 base units of USDC (USD Coin) on the Base network, which equals $0.02 per call (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json responses.\n\nThe payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the exact payment scheme. The maximum timeout for payment verification is 300 seconds (5 minutes). The x402 challenge is version 1 and the USDC asset contract is the canonical Base USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.\n\nBeyond the x402 challenge metadata, very little is known about what this endpoint actually does. The crawled pages (API docs, pricing, README) all returned only a \"Connect wallet\" prompt with no further documentation, schema, or usage examples. The endpoint is live and responding with a valid 402 challenge, but the actual functionality behind the paywall is undocumented. Callers should be aware that the specific behavior, input format, and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","post-method"],"categories":["payments","api"],"synonyms":["x402 endpoint","paid API","USDC API","Base network API","micropayment API","lowpaymentfee","premium access endpoint"],"warnings":["No documentation available — all crawled pages (API, pricing, README) return only 'Connect wallet'","Unknown request body schema — no input format documented","Unknown response body schema — no output format documented","Actual functionality behind the paywall is completely undocumented","The specific inbox ID (192) in the URL suggests this may be a user-specific or resource-specific endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/192","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and network details. However, there is zero documentation: all crawled pages show only 'Connect wallet' with no API docs, schemas, examples, or description of what the endpoint actually does. 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":"2026-04-21T21:45:52.312Z","embedding":[-0.0129776,-0.037353516,0.041259766,0.020950317,-0.0032806396,-0.022262573,0.014724731,0.025146484,0.07727051,-0.065979004,0.04598999,-0.05227661,-0.043945312,-0.04144287,-0.037231445,-0.004020691,-0.0056915283,0.008613586,-0.047790527,0.024261475,0.027069092,-0.020019531,-0.004337311,0.04949951,-0.0030136108,-0.012527466,-0.015670776,-0.00056934357,-0.016220093,-0.023605347,0.020950317,-0.020217896,-0.012451172,0.0071411133,-0.016433716,-0.009284973,0.007156372,0.04824829,0.026290894,-0.0034179688,0.00566864,-0.06298828,0.0079574585,-0.018508911,-0.052124023,-0.013923645,0.009025574,-0.018539429,-0.011642456,0.0032234192,-0.02432251,0.011734009,-0.0102005005,0.01374054,0.0010442734,0.0035552979,-0.0068855286,-0.013534546,0.011062622,0.026351929,-0.022140503,-0.075927734,-0.016998291,-0.0031013489,0.017150879,0.045135498,-0.019317627,0.05532837,0.020431519,0.070495605,0.03353882,0.06359863,0.03866577,0.013465881,-0.012809753,-0.007408142,0.01953125,0.038269043,-0.000641346,-0.021957397,-0.019699097,-0.03677368,-0.06567383,-0.00069761276,-0.027191162,-0.03656006,-0.01939392,0.03390503,-0.01902771,0.023864746,-0.070251465,0.014778137,-0.023376465,0.00844574,-0.007949829,-0.005908966,-0.017578125,0.016418457,0.0018882751,0.013015747,0.0018568039,-0.030319214,0.031951904,0.01473999,0.05819702,0.033111572,0.0151901245,0.027236938,-0.009788513,-0.016082764,0.0026073456,0.011474609,-0.010322571,-0.011421204,0.029632568,-0.010749817,-0.0065689087,0.024749756,-0.0067367554,0.037750244,-0.05368042,0.054473877,-0.007621765,-0.02053833,0.020523071,-0.0287323,-0.012329102,-0.0023326874,-0.027648926,0.0036201477,-0.00081014633,0.0055885315,0.02558899,-0.03262329,-0.03060913,0.016326904,-0.03778076,-0.027191162,-0.05734253,-0.015136719,0.03515625,-0.041625977,0.01473999,0.050048828,-0.07409668,-0.009513855,-0.051818848,0.016693115,-0.039611816,-0.01058197,0.0025348663,0.020263672,0.0020446777,-0.000042915344,-0.01058197,-0.019134521,-0.026626587,0.040130615,-0.0093688965,0.035583496,0.011619568,0.017868042,0.020828247,0.013824463,0.03414917,0.0357666,-0.0043792725,-0.06744385,-0.06640625,-0.015823364,0.01828003,-0.00026369095,-0.040771484,0.008728027,-0.0032444,-0.08831787,-0.057037354,0.008277893,-0.009315491,-0.050689697,0.0020961761,-0.043060303,0.009971619,-0.019104004,-0.06774902,-0.026229858,-0.019973755,0.05630493,0.03643799,-0.0015506744,0.032043457,-0.011489868,0.055541992,0.0035476685,-0.03152466,-0.027328491,0.03289795,-0.029525757,0.022598267,0.0052261353,0.01676941,-0.03253174,0.032287598,0.05935669,0.015586853,-0.021453857,0.009803772,-0.048187256,-0.04248047,-0.024124146,0.017059326,0.0060539246,-0.008010864,0.026428223,-0.026733398,-0.026260376,0.00630188,-0.0074005127,0.015335083,0.04660034,0.0009021759,0.002357483,0.0066871643,0.00881958,-0.04067993,0.045074463,0.016281128,0.027938843,-0.028656006,-0.017990112,0.014801025,0.019226074,-0.0340271,-0.0055274963,-0.027435303,0.025970459,-0.0025558472,0.0063552856,0.04458618,-0.01826477,-0.034729004,-0.025436401,-0.01739502,0.014221191,0.0004196167,-0.021469116,-0.04827881,-0.06958008,0.034698486,0.061706543,0.015777588,-0.008323669,0.018218994,-0.024978638,-0.009971619,-0.074523926,0.06628418,0.056671143,-0.019195557,-0.0154418945,0.028869629,-0.031555176,-0.039489746,-0.01550293,-0.014022827,-0.0121154785,-0.018081665,0.0084991455,-0.026519775,-0.014549255,0.024978638,0.005504608,0.044830322,-0.005558014,-0.060577393,-0.03250122,-0.0044517517,0.028442383,-0.02734375,-0.009971619,-0.011932373,0.029708862,0.026397705,0.0015134811,0.025238037,0.008262634,0.0009717941,-0.0044670105,0.004753113,-0.013465881,-0.01675415,0.026916504,-0.0041999817,-0.07543945,0.010040283,-0.0017442703,0.050720215,-0.03414917,0.03930664,-0.0050621033,-0.016067505,0.07507324,-0.024749756,-0.051971436,-0.0038890839,0.018722534,0.05279541,0.037628174,0.019515991,-0.0028476715,-0.010147095,0.06286621,-0.017288208,-0.0026931763,0.024505615,0.030349731,0.032592773,0.01133728,-0.06585693,-0.028305054,0.006629944,-0.01802063,0.027404785,-0.01525116,0.045135498,-0.022842407,0.018096924,-0.029922485,0.015670776,-0.02772522,-0.017333984,-0.015991211,-0.008026123,-0.019424438,0.007865906,0.033325195,0.015029907,-0.025375366,0.0026893616,0.044036865,0.0051994324,-0.0036010742,-0.026626587,-0.02822876,-0.026489258,-0.0032310486,0.012588501,0.03704834,0.013717651,0.044128418,-0.046691895,0.013114929,0.029174805,0.013420105,0.043548584,-0.017440796,0.015083313,-0.060913086,-0.0524292,-0.019866943,-0.047698975,0.038848877,0.01411438,-0.0004184246,0.041809082,0.017822266,-0.033935547,-0.038513184,0.028884888,-0.038848877,-0.025375366,0.032806396,-0.023468018,-0.02128601,0.0069770813,0.017837524,0.030136108,0.030715942,0.026412964,0.006942749,0.06652832,0.039276123,0.013343811,0.004261017,0.013122559,0.026443481,0.0022449493,-0.018997192,-0.024810791,-0.02519226,0.028198242,-0.013191223,-0.01953125,-0.0637207,0.04006958,0.03704834,0.09527588,0.0087509155,0.012367249,0.038635254,-0.004589081,-0.005092621,-0.023803711,-0.041534424,-0.028167725,-0.045715332,0.036987305,-0.024810791,-0.0011606216,-0.016189575,0.035003662,0.009460449,0.026535034,-0.040222168,0.06036377,0.0051231384,-0.026611328,0.010131836,0.020339966,0.05105591,0.070007324,-0.035064697,0.033721924,0.010368347,-0.027755737,-0.0021877289,0.026443481,-0.0024089813,0.005207062,-0.05203247,-0.013977051,0.012832642,0.00088214874,-0.051971436,0.0007419586,0.008140564,0.024246216,0.0317688,-0.025726318,-0.023345947,-0.02368164,-0.009056091,-0.046020508,-0.017807007,-0.03817749,0.026123047,0.03704834,-0.034210205,-0.0057640076,-0.0090789795,0.008811951,-0.01210022,0.010551453,-0.00970459,0.0020923615,-0.03213501,0.015266418,0.006500244,0.019226074,0.01727295,0.034179688,0.027618408,0.037078857,0.047210693,0.000056147575,0.0028095245,-0.049560547,0.011741638,-0.047058105,0.0024929047,0.015342712,-0.018341064,-0.006225586,-0.019927979,-0.021865845,-0.022155762,0.018615723,-0.037597656,0.004535675,0.023651123,-0.027297974,-0.048614502,-0.036987305,-0.013557434,0.012710571,0.07446289,0.027450562,0.0043144226,-0.078125,-0.02130127,0.031341553,-0.001537323,-0.0002887249,-0.015342712,0.002122879,-0.016983032,-0.029785156,-0.036834717,-0.022644043,0.03387451,-0.006149292,-0.0103302,0.034851074,-0.022521973,0.025054932,0.0012683868,0.00047159195,0.040039062,-0.020568848,-0.0087509155,-0.021621704,0.025268555,0.007167816,-0.013336182,-0.057250977,0.04272461,0.017211914,0.03302002,-0.03842163,0.012466431,-0.0052375793,0.025817871,0.0047950745,-0.0149383545,-0.0015983582,0.003829956,-0.048309326,-0.09063721,0.041259766,-0.011154175,0.024993896,0.015464783,-0.0058784485,0.021453857,0.004386902,0.0050849915,0.024414062,-0.015136719,-0.0016460419,-0.045196533,-0.041290283,-0.028198242,0.0014266968,-0.016784668,0.02708435,-0.01789856,0.005973816,-0.0010261536,-0.020980835,0.011711121,-0.00091791153,-0.023101807,0.013824463,0.0042419434,0.019119263,0.039489746,0.0057029724,-0.028015137,0.014221191,0.0037899017,-0.0015058517,0.0066337585,0.055755615,0.0025558472,-0.0056533813,-0.017440796,-0.009483337,-0.007129669,-0.041900635,-0.0027980804,-0.008270264,0.025680542,0.0070762634,-0.035217285,0.013900757,0.012557983,-0.024307251,-0.0072898865,0.026306152,0.024337769,-0.025787354,0.023620605,0.020996094,0.03778076,-0.033569336,-0.013954163,-0.0011463165,0.025146484,0.03250122,0.02217102,-0.021911621,0.0028514862,-0.00223732,0.034820557,0.0079422,-0.030380249,-0.009307861,-0.0049362183,0.018417358,0.026931763,0.022064209,-0.023803711,-0.024124146,-0.010017395,0.0026474,-0.022872925,0.026016235,0.017288208,0.012565613,-0.010757446,0.027160645,0.020187378,-0.030029297,-0.009155273,-0.019134521,0.032165527,-0.011245728,-0.018844604,0.013282776,0.01285553,0.04437256,-0.04550171,-0.006477356,0.005466461,0.012123108,-0.024475098,-0.051849365,-0.029129028,-0.014923096,0.033477783,0.016433716,-0.0025177002,0.010818481,-0.013793945,0.00680542,0.024230957,0.0022907257,-0.017608643,-0.017364502,-0.034851074,0.0044021606,-0.012031555,-0.011940002,-0.014030457,0.006538391,-0.016159058,-0.025894165,0.0011405945,-0.016616821,-0.000374794,-0.013969421,0.015052795,0.03466797,-0.014083862,0.010383606,-0.02078247,-0.03010559,0.011726379,0.0056266785,0.021759033,-0.041900635,0.012161255,-0.013336182,0.00844574,-0.0010128021,0.000018656254,0.022064209,0.021347046,0.0011129379,0.024902344,-0.03024292,0.027511597,-0.036590576,0.0016851425,0.009117126,-0.03277588,-0.01576233,-0.023223877,-0.014099121,0.03817749,-0.023208618,0.002336502,-0.025726318,-0.040740967,-0.006790161,-0.04220581,0.031707764,0.030929565,0.03277588,-0.039642334,-0.003660202,-0.010856628,-0.007751465,-0.00894928,0.0025291443,-0.010345459,0.033691406,0.025268555,0.012825012,-0.037963867,-0.024093628,-0.023376465,-0.0017852783,-0.061187744,-0.045043945,-0.024215698,-0.000685215,-0.0077934265,-0.006690979,-0.020050049,-0.008041382,-0.011657715,-0.0390625,0.01083374,0.007820129,0.017501831,0.030288696,-0.026550293,-0.0026569366,0.017044067,-0.0068511963,0.035827637,0.008804321,0.00032162666,-0.0546875,0.00088119507,0.026397705,0.026260376,-0.022216797,-0.012145996,0.004535675,-0.029663086,-0.04046631,-0.0033340454,-0.017028809,0.008712769,-0.0029315948,0.002822876,-0.045410156,-0.003534317,-0.017440796,0.0118255615,-0.0005402565,0.000014841557,0.02027893,0.0062332153,0.016464233,-0.006500244,-0.014579773,-0.040893555,0.015975952,0.011100769,-0.009361267,0.015396118,0.05517578,0.009155273,-0.013465881,0.019561768,-0.005268097,0.009498596,-0.02368164,0.0037841797,-0.025665283,0.0053138733,-0.009849548,-0.017807007,-0.026947021,0.002937317,0.08166504,0.01109314,-0.0104522705,-0.01411438,-0.0076942444,0.018600464,0.017089844,-0.04559326,-0.006702423,-0.018737793,0.027404785,-0.016159058,0.0058898926,0.005958557,0.021438599,-0.007751465,-0.057891846,-0.007904053,0.012138367,0.0118637085,-0.04336548,-0.016159058,-0.04751587,0.005012512,-0.016571045,0.0028038025,0.000790596,-0.00065374374,-0.01838684,-0.09234619,0.0015554428,0.047576904,0.018447876,0.011222839,-0.023468018,0.015701294,0.007369995,-0.02645874,-0.019226074,0.024139404,-0.025817871,-0.007686615,-0.03665161,0.0317688,-0.010719299,-0.030380249,0.008056641,0.0047302246,0.01737976,-0.019195557,0.010612488,-0.0154418945,0.007167816,-0.008888245,0.0033226013,-0.0047721863,-0.021713257,0.014389038,-0.04901123,0.027954102,0.00944519,-0.0010671616,-0.0028743744,0.02166748,0.029678345,-0.041168213,-0.00869751,0.04534912,0.0105896,0.047088623,-0.022354126,0.04421997,0.0031700134,-0.0064582825,0.022064209,-0.028060913,-0.026931763,-0.046813965,-0.02507019,0.00050735474,0.010437012,0.012268066,-0.01902771,0.0050849915,0.028198242,0.019363403,0.01763916,-0.0035820007,-0.031829834,-0.017684937,0.020507812,0.010932922,-0.0026550293,-0.00422287,0.017745972,0.026947021,0.041870117,0.009590149,-0.013847351,-0.0033874512,0.015014648,-0.01889038,0.010131836,0.029312134,0.012748718,0.0060424805,0.017700195,0.02798462,-0.024780273,-0.03314209,0.00022792816,-0.021377563,0.007865906,0.0056991577,-0.0113220215,-0.00045967102,0.006629944,0.001332283,-0.038238525,0.015670776,-0.025115967,-0.029312134,0.009468079,-0.016479492,0.011795044,0.019989014,-0.0026779175,0.005924225,0.0069847107,0.025817871,-0.0056915283,-0.01612854,0.032165527,0.032592773,-0.0032672882,-0.017578125,0.011436462,-0.00730896,-0.007167816,0.0029754639,-0.028518677,-0.00079393387,0.033966064,-0.020874023,0.012557983,-0.0029125214,0.026123047,0.008155823,0.011428833,-0.0006175041,0.0035953522,-0.015304565,0.036621094,-0.04650879,0.009208679,0.017913818,0.001953125,-0.021865845,-0.0039482117,-0.032562256,0.023086548,0.022277832,-0.010627747,0.041290283,-0.006843567,0.029281616,-0.017974854,-0.026626587,0.009513855,-0.026519775,-0.019546509,0.03677368,-0.015655518,-0.0039024353,0.024429321,-0.026184082,0.02684021,-0.046783447,0.019073486,-0.0036201477,-0.019424438,-0.013076782,-0.02960205,-0.005619049,-0.030639648,-0.031341553,0.013168335,0.0033779144,0.051849365,0.030822754,0.006427765,0.024505615,0.014190674,0.0015640259,-0.0418396,-0.026931763,0.00843811,-0.022613525,0.015838623,-0.031707764,0.043151855,0.040771484,-0.009513855,0.029449463,0.0423584,0.025619507,0.007003784,0.0082473755,-0.004257202,0.007671356,-0.0075149536,0.037994385,-0.005870819,0.049041748,-0.037384033,0.03060913,0.006641388,0.018692017,-0.016586304,0.026763916,0.07574463,0.016799927,-0.011695862,0.042907715,-0.011436462,-0.011695862,-0.014671326,-0.009857178,0.028457642,0.002506256,0.038909912,0.026397705,0.019348145,-0.027145386,0.019943237,-0.009361267,-0.04171753,0.033966064,0.039276123,-0.009552002,-0.0013284683,0.005958557,0.009529114,-0.045928955,-0.0073013306,0.034484863,-0.0087890625,0.014297485,-0.010383606,-0.0034179688,-0.004421234,0.024597168,0.014442444,0.029373169,-0.023590088,0.029571533,0.040039062,0.003458023,0.029632568,0.014579773,0.010848999,-0.023620605,-0.019866943,0.01259613,0.030776978,-0.0038700104,-0.0036411285,0.02178955,0.022705078,0.053375244,0.02748108,-0.025009155,-0.006160736,0.04071045,0.017211914,-0.011238098,0.04144287,0.028167725,0.011642456,0.04800415,0.023895264,0.022827148,-0.04119873,0.0059127808,0.00014770031,0.011230469,-0.0009417534,-0.011177063,0.022644043,-0.004535675,0.033172607,-0.0014448166,-0.014274597,0.02772522,0.02784729,-0.008598328,-0.009559631,0.0037441254,-0.007774353,-0.006538391,0.0018072128,0.018051147,-0.01675415,0.01878357,0.010726929,0.031204224,-0.034729004,0.030792236,-0.004070282,-0.033477783,-0.0042877197,0.017944336,-0.0390625,0.0065307617,-0.011489868,0.0044174194,-0.033172607,0.0124053955,0.03326416,-0.01171875,0.03414917,-0.012512207,0.0023117065,0.009429932,0.03475952,0.018005371,-0.0038528442,-0.0033512115,-0.034606934,0.020111084,0.057617188,-0.0047416687,0.0020427704,-0.017822266,-0.0061531067,0.0146865845,-0.002658844,-0.007724762,-0.0047073364,-0.022766113,-0.052093506,0.014472961,0.052459717,0.022857666,0.025680542,-0.007335663,-0.01902771,0.0037403107,0.028335571,-0.009361267,-0.011352539,-0.025436401,0.019607544,-0.01234436,0.05429077,0.032104492,0.00078725815,0.04486084,-0.009773254,-0.017944336,-0.00712204,-0.010932922,0.024856567,-0.006877899,0.0035877228,-0.022018433,0.02029419,-0.031463623,-0.030883789,-0.0018358231,-0.019851685,-0.02217102,-0.03173828,0.002986908,0.014152527,0.021148682,0.029052734,0.021865845,-0.02960205,0.064453125,-0.0050354004,0.03945923,-0.018295288,-0.0008921623,0.05090332,0.027664185,0.042999268,0.024093628,0.011375427,-0.028625488,0.0068244934,0.017303467,0.021499634,0.015083313,0.0044021606,-0.023742676,0.036956787,-0.019348145,0.010787964,-0.0034923553,0.002576828,0.009971619,-0.0064048767,-0.00919342,-0.0049324036,-0.0037498474,0.007698059,0.035888672,-0.023727417,-0.009559631,-0.0154418945,-0.017929077,0.038146973,-0.0036640167,0.002670288,0.0051193237,-0.0052871704,0.01914978,-0.018493652,-0.0132369995,0.014350891,0.024810791,-0.049194336,-0.00756073,0.0030441284,0.021057129,-0.033050537,0.034362793,0.02520752,0.0034389496,-0.0023975372,0.058685303,-0.0041160583,0.038085938,-0.024673462,0.016983032,0.03164673,0.010391235,-0.01928711,0.01878357,0.012672424,-0.015090942,0.018615723,0.037231445,-0.0032997131,0.00497818,-0.0026855469,-0.02645874,0.023986816,0.010513306,-0.01802063,0.0007686615,-0.021118164,-0.018218994,0.008476257,0.0052757263,0.006034851,0.0049095154,0.018249512,-0.0055160522,0.0046424866,0.04171753,0.009483337,-0.041809082,0.0018997192,0.008743286,0.029846191,-0.04095459,-0.014694214,0.011375427,-0.040374756,0.011512756,0.02545166,0.00055933,0.011940002,-0.022964478,-0.006313324,0.023513794,0.008514404,0.01852417,0.0057411194,0.008682251,0.023864746,-0.033325195,0.007873535,-0.009155273,0.0046958923,0.01739502,0.017196655,-0.017745972,-0.027236938,0.017425537,-0.00283432,0.014602661,0.0053634644,-0.00042700768,0.0390625,-0.018066406,-0.0053710938,-0.005794525,0.014007568,-0.0074691772,-0.014839172,-0.02003479,0.020462036,0.055908203,-0.027664185,0.00050878525,0.0184021,0.024337769,0.02519226,0.026397705,0.0072021484,0.026473999,0.023651123,-0.013877869,-0.020828247,0.028152466,-0.0057525635,-0.040893555,0.029846191,-0.017196655,-0.00680542,0.015609741,0.018615723,-0.0015039444,-0.033355713,-0.025115967,-0.020263672,-0.018188477,0.013664246,-0.011444092,0.0012197495,-0.033050537,-0.015052795,0.0064926147,-0.01826477,-0.027023315,-0.030715942,-0.004180908,-0.014030457,-0.038848877,0.022445679,-0.03152466,0.011314392,-0.019134521,0.0074157715,-0.018981934,0.021942139,0.0158844,-0.012367249,0.018173218,0.02999878,0.01727295,0.003370285,0.020996094,-0.016845703,-0.029266357,-0.026535034,-0.0006146431,-0.01411438,0.026657104,-0.019729614,0.023483276,0.011329651,-0.010314941,0.003862381,-0.012268066,-0.013320923,-0.013198853,-0.036010742,-0.021347046,0.020111084,0.022445679,-0.0129470825,-0.020507812,0.05343628,-0.02330017,-0.01876831,0.0287323,0.030288696,0.01663208,0.02973938,-0.005809784,-0.0126571655,-0.019226074,0.005695343,-0.015991211,-0.002363205,0.012886047,0.004798889,-0.0115356445,0.013809204,0.027038574,-0.004432678,-0.0068092346,0.026550293,0.0021781921,-0.011489868,0.029769897,0.006515503,0.0072364807,-0.0031280518,-0.013885498,0.022613525,0.024261475,0.008514404,0.0015764236,-0.00041294098,0.0075683594,-0.012298584,0.021209717,0.03439331,-0.02458191,-0.026626587,-0.01638794,-0.025482178,0.015159607,0.019012451,0.0052223206,0.00081539154,0.01525116,-0.029785156,-0.024398804,-0.016433716,0.020843506,0.018218994,-0.011795044,-0.004085541,0.010673523,0.012626648,-0.039398193,-0.0035743713,-0.052124023,-0.031341553,-0.01713562,-0.0289917,0.009269714,0.011360168,-0.021240234,0.00068330765,-0.010475159,-0.0028972626,0.0011224747,0.022445679,-0.021133423,-0.008132935,0.04071045,0.02734375,-0.015014648,0.024414062,-0.041503906,-0.010986328,0.014526367,0.001074791,0.014923096,-0.016098022,0.033843994,0.005683899,-0.009254456,0.016418457,-0.01550293,0.012992859,-0.026931763,-0.011505127,-0.00016987324,-0.011581421,0.013771057,-0.023406982,-0.02999878,-0.00071907043,-0.018249512,-0.03640747,0.00869751,0.02279663,0.029663086,-0.005466461,0.042053223,-0.014274597,-0.03201294,0.029052734,0.0010986328,-0.013885498,0.008071899,0.029067993,0.0012454987,-0.009429932,-0.006175995,-0.009887695,-0.03466797,-0.00033211708,0.019927979,-0.0155181885,0.0008125305,0.026489258,0.0042381287,0.049621582,-0.0044288635,0.022003174,0.016571045,0.0121154785,0.021240234,0.0010814667,0.047973633,0.0059776306,-0.035949707,0.0051078796,0.008895874,-0.027450562,-0.0076942444,-0.008262634,-0.000100791454,-0.04714966,0.007858276,-0.0026302338,0.02520752,-0.0041275024,-0.0015153885,-0.018539429,0.0070762634,-0.040100098,0.009025574,-0.034179688,0.003917694,0.023529053,0.006713867,0.016693115,-0.0065193176,-0.03048706,0.010643005,0.032287598,-0.0075416565,-0.02909851,-0.014549255,0.015335083,0.0041503906,-0.008651733,0.0002348423,-0.023269653,-0.0049705505,-0.01184082,-0.006061554,0.005672455,-0.010803223,0.023971558,0.0050849915,-0.0031776428,-0.00032877922,0.033813477,0.012168884,-0.007659912,0.012084961,0.016906738,0.022415161,0.037841797,-0.017333984,0.0104522705,0.03237915,-0.03189087,0.055603027,-0.008972168,0.017822266,-0.018295288,-0.0002309084,-0.036346436,-0.020126343,-0.024978638,-0.0029010773],"createdAt":"2026-04-21T18:32:21.853Z","updatedAt":"2026-04-22T01:02:16.634Z","lastSeenAt":"2026-04-22T01:02:16.634Z","tsv":"'0.02':13,28,72 '000':59 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':97 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':131 '1':119 '20':58 '300':110 '402':178 '5':112 '6':77 'Base network API' 'USDC API' 'accept':81 'access':46 'actual':145,182 'address':96 'api':5,20,45,150 'application/json':86 'asset':123 'awar':192 'base':8,23,60,68,128 'base-network' 'behavior':196 'behind':184 'beyond':132 'call':15,30,43,74 'caller':189 'canon':127 'chain':94 'challeng':56,116,135,179 'coin':65 'connect':158 'contract':124 'crawl':148 'decim':78 'doc':151 'document':164 'endpoint':6,21,35,80,144,170 'equal':71 'exact':100 'exampl':168 'format':198 'function':183 'gate':3,18,51 'input':197 'json-response' 'known':140 'littl':138 'live':172 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':104 'metadata':136 'micropayment API' 'minut':113 'network':69 'on-chain':92 'page':149 'paid API' 'pay':41 'pay-per-cal':40 'pay-per-call' 'payabl':9,24 'payment':55,89,101,107 'paywal':186 'per':14,29,42,73 'post':82 'post-method' 'premium':4,19,44 'premium access endpoint' 'price':152 'prompt':160 'protocol':34 'provid':38 'readm':153 'request':49,83 'requir':57 'respond':174 'respons':87,200 'return':85,155 'schema':165 'scheme':102 'second':111 'servic':47 'settl':91 'specif':195 'structur':201 'timeout':105 'undocu':188 'unit':61 'unknown':203 'usag':167 'usd':64 'usdc':11,26,63,75,122,129 'usdc-settlement' 'use':76,98 'valid':177 'verif':108 'version':118 'wallet':159 'x402':2,17,33,54,115,134 'x402 endpoint' 'x402-gated':1,16 'x402-payment' 'x402-protocol':32","prices":[{"id":"21485f44-40f7-4f19-a4f0-a0eb993406e3","listingId":"32cc4af9-d7fa-4952-a9af-0ecb05688f58","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.853Z"}],"sources":[{"listingId":"32cc4af9-d7fa-4952-a9af-0ecb05688f58","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/192","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.853Z","lastSeenAt":"2026-04-22T01:02:16.634Z"}],"details":{"listingId":"32cc4af9-d7fa-4952-a9af-0ecb05688f58","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/192 \\\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":"Endpoint returns a valid x402 challenge with status 402","source_url":"https://lowpaymentfee.com/api/v1/inbox/192"},{"claim":"Payment requires 20,000 base units of USDC on Base network ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/inbox/192"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/192"},{"claim":"All crawled documentation pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Accessing a premium API resource behind a $0.02 USDC paywall on Base","Demonstrating x402 protocol payment flows with a low-cost endpoint","Integrating pay-per-call API access into agent workflows"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents needing low-cost pay-per-call API access on Base","Testing USDC micropayment flows"],"notFor":["Users who need detailed API documentation before purchasing","Applications requiring known, well-documented response schemas","High-throughput use cases where per-call on-chain settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.251Z"},"updatedAt":"2026-04-22T01:02:16.634Z"}}