{"id":"a7e77847-7ace-4f41-b257-042bfa82d65f","shortId":"DEK2Rk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/charges/276` is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. The payment scheme is \"exact,\" meaning the caller pays a fixed amount per request. The response MIME type is `application/json`.\n\nNote that while the platform advertises a broad catalog of endpoints (analytics, AI inference, finance, geocoding, etc.), the specific functionality behind `/api/v1/charges/276` labeled \"Premium API Access\" is not documented in detail. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no further technical documentation. Without additional schema or example payloads, the exact input/output contract for this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The exact functionality behind /api/v1/charges/276 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no technical content.","No OpenAPI spec, input schema, or example responses are available — callers cannot know what to send or expect back.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but it is unclear which, if any, this specific charge ID maps to."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/276","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/charges/276","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, the specific functionality of /api/v1/charges/276 is undocumented — no input schema, no output schema, no example requests or responses. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. 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":"2026-04-19T03:37:54.326Z","embedding":[-0.018112183,-0.037109375,0.052459717,0.03010559,0.017089844,-0.028320312,-0.023773193,0.029373169,0.06842041,-0.076049805,0.03277588,-0.03475952,-0.026992798,-0.036621094,-0.037109375,0.011871338,-0.016464233,0.002588272,-0.04736328,0.030914307,0.029403687,-0.028793335,-0.010902405,0.03225708,0.002407074,-0.032684326,-0.0118637085,-0.015960693,-0.010185242,-0.03805542,0.02973938,-0.022262573,-0.00932312,0.010810852,-0.017623901,-0.021194458,-0.015075684,0.037506104,0.027877808,-0.004940033,-0.005607605,-0.056549072,-0.0014152527,0.0066490173,-0.05984497,-0.008598328,-0.00308609,-0.014251709,-0.005783081,0.013336182,-0.026062012,-0.0128479,-0.0073623657,-0.0015792847,0.014892578,0.00919342,0.0058250427,-0.001572609,0.013069153,0.01537323,-0.0076446533,-0.0769043,-0.017105103,-0.0024547577,-0.008338928,0.05480957,-0.0129852295,0.049621582,0.014228821,0.05343628,0.036193848,0.057861328,0.03213501,0.016143799,0.004386902,-0.0009422302,0.0053749084,0.052947998,-0.020935059,-0.003446579,-0.017990112,-0.011650085,-0.044433594,-0.004016876,-0.018295288,-0.038879395,-0.022628784,0.019973755,-0.022201538,0.020858765,-0.06793213,-0.0019683838,-0.016235352,-0.00004851818,0.007297516,-0.001958847,-0.016204834,0.019699097,-0.009643555,0.021713257,0.016525269,-0.035217285,0.017074585,0.004142761,0.041809082,0.046691895,0.02470398,0.03265381,-0.014030457,-0.014083862,-0.01612854,0.024612427,-0.018493652,-0.018661499,0.024978638,0.011985779,-0.019699097,0.021728516,-0.03491211,0.0211792,-0.047790527,0.04714966,0.020858765,-0.024917603,0.016494751,-0.0418396,-0.016296387,0.013496399,-0.038208008,-0.007621765,0.012969971,0.014907837,0.03463745,-0.01939392,-0.015296936,0.0024375916,-0.018554688,-0.03503418,-0.056549072,-0.035125732,0.04272461,-0.031036377,0.027313232,0.036315918,-0.09881592,-0.010543823,-0.046936035,0.006259918,-0.031982422,-0.006877899,-0.01612854,0.026428223,-0.020584106,-0.009231567,-0.021774292,-0.02154541,0.0005965233,0.036590576,-0.024047852,0.051574707,-0.0067825317,0.034454346,0.006641388,0.0039863586,0.028137207,0.02809143,-0.0027713776,-0.068481445,-0.07989502,-0.02470398,-0.014030457,-0.01965332,-0.040802002,-0.006591797,0.0018730164,-0.068359375,-0.027862549,-0.0037460327,-0.0059432983,-0.03149414,-0.010360718,-0.03741455,0.021209717,-0.009292603,-0.07104492,-0.008880615,-0.021270752,0.06945801,0.03363037,0.014045715,0.031829834,-0.018676758,0.06555176,0.027053833,-0.030044556,-0.033325195,0.030075073,-0.01399231,0.021591187,-0.00806427,0.0006251335,-0.028717041,0.038635254,0.068847656,0.022598267,-0.018615723,-0.012886047,-0.04257202,-0.035980225,-0.041931152,0.014556885,0.004058838,0.0040740967,0.034576416,-0.03692627,-0.037628174,0.00070762634,0.0047569275,0.0146102905,0.04272461,0.012489319,-0.013031006,0.019042969,0.01928711,-0.037841797,0.031799316,0.025680542,0.011772156,-0.012611389,-0.02178955,0.027542114,0.016967773,-0.027252197,0.016677856,-0.025802612,0.02848816,0.008811951,0.023132324,0.026229858,-0.02923584,-0.024795532,-0.026351929,-0.0052948,0.03125,0.012565613,-0.027618408,-0.037139893,-0.076538086,0.054351807,0.03857422,0.037475586,-0.00039839745,0.02041626,-0.027328491,-0.010444641,-0.07043457,0.052124023,0.07952881,-0.012123108,-0.022827148,0.011856079,-0.020553589,-0.041900635,-0.014190674,-0.0045051575,-0.033325195,-0.017868042,0.0071029663,-0.046295166,0.0041923523,0.010276794,0.027130127,0.07067871,-0.024429321,-0.05517578,-0.027770996,-0.00415802,0.008384705,-0.019882202,-0.007881165,-0.015144348,0.018508911,0.02709961,-0.01008606,0.020568848,-0.0005354881,0.012527466,-0.0067367554,-0.0049362183,-0.024368286,-0.02758789,0.005592346,-0.0121536255,-0.0597229,0.0018377304,-0.0047721863,0.060424805,-0.046142578,0.056030273,-0.0040740967,0.003786087,0.0703125,-0.009819031,-0.05529785,0.008987427,0.03439331,0.022094727,0.046295166,0.014083862,-0.03237915,-0.0017948151,0.07476807,-0.014381409,-0.0115737915,0.010627747,0.008666992,0.030517578,0.00365448,-0.06744385,-0.03125,0.0011816025,-0.026107788,0.01763916,-0.03643799,0.02923584,-0.010032654,0.008216858,-0.016052246,0.0057029724,-0.030578613,0.015914917,-0.008781433,0.011604309,-0.026885986,-0.011917114,0.021652222,0.0045433044,-0.021514893,0.003993988,0.03741455,0.033325195,-0.0093688965,-0.03363037,-0.028671265,-0.0047187805,0.00027942657,0.03866577,0.018829346,0.023132324,0.042297363,-0.037841797,0.021652222,0.027877808,0.015838623,0.036590576,-0.0030765533,0.013366699,-0.06536865,-0.052825928,-0.028579712,-0.037078857,0.037109375,0.025650024,0.003753662,0.053131104,0.010101318,-0.031555176,-0.040222168,0.019500732,-0.046722412,-0.0077209473,0.040802002,-0.00415802,-0.037902832,-0.0027065277,0.0017757416,0.005203247,0.034057617,0.02357483,0.0032253265,0.070373535,0.04711914,-0.00032234192,0.017929077,0.013877869,0.023040771,0.0017995834,-0.038146973,-0.021270752,-0.007949829,0.026504517,-0.010726929,-0.015312195,-0.068603516,0.052124023,0.04953003,0.09057617,0.030288696,0.007095337,0.03540039,-0.014175415,0.012489319,-0.02758789,-0.016983032,-0.019577026,-0.050994873,0.02180481,-0.011001587,-0.009773254,-0.026321411,0.042907715,0.004837036,0.02154541,-0.036132812,0.05419922,0.00041413307,-0.008453369,0.0234375,0.0057029724,0.04083252,0.061309814,-0.040039062,0.0335083,0.0335083,-0.035827637,0.00020217896,0.045410156,-0.00932312,-0.00021600723,-0.05633545,-0.01675415,0.008140564,-0.009117126,-0.061706543,-0.00015938282,0.006084442,0.018463135,0.031463623,-0.010505676,-0.026489258,-0.011360168,-0.01626587,-0.04550171,-0.0053863525,-0.03552246,0.0078048706,0.05316162,-0.029968262,-0.004108429,0.012718201,-0.011924744,-0.015945435,0.00932312,0.018554688,-0.011856079,-0.044158936,0.030151367,0.00844574,0.014854431,0.007637024,0.031921387,0.023223877,0.020401001,0.046325684,0.011222839,-0.017089844,-0.059570312,0.022583008,-0.045440674,0.00012683868,0.01977539,-0.012962341,-0.008163452,-0.014945984,-0.01725769,-0.039123535,0.0026893616,-0.02154541,0.0037555695,0.013076782,-0.037719727,-0.03933716,-0.05545044,-0.008148193,-0.0067214966,0.06732178,0.03253174,-0.0027389526,-0.06488037,-0.008140564,0.02406311,0.008575439,0.009216309,-0.014701843,-0.01159668,-0.0057678223,-0.029403687,-0.0018377304,-0.009750366,0.010375977,-0.0074653625,-0.011985779,0.041625977,0.001750946,0.021102905,-0.0057640076,0.012573242,0.042266846,-0.03250122,-0.0104522705,-0.021469116,0.033721924,0.0018548965,-0.0036258698,-0.054260254,0.04144287,0.017059326,0.024047852,-0.032196045,0.002861023,-0.00035119057,0.0143585205,0.014785767,-0.014411926,-0.01348114,-0.010757446,-0.052642822,-0.08123779,0.034057617,-0.022384644,0.030654907,0.012840271,0.0072631836,0.026046753,-0.009414673,-0.0016012192,0.025054932,-0.027053833,-0.008972168,-0.019195557,-0.02885437,-0.011680603,-0.01108551,-0.0129470825,0.01763916,-0.011360168,0.020751953,-0.011146545,-0.018096924,0.022232056,0.0035896301,-0.0036067963,0.020248413,0.0015916824,0.03189087,0.05126953,0.013061523,-0.043182373,0.023651123,-0.003742218,0.00655365,-0.014045715,0.04019165,0.027770996,-0.0127334595,-0.0044784546,0.0001591444,-0.012168884,-0.017593384,0.0035057068,0.017471313,0.027389526,-0.0051727295,-0.04144287,0.027542114,0.01133728,-0.04446411,-0.0051231384,0.014205933,0.011627197,-0.03527832,0.02923584,0.03643799,0.06311035,-0.02368164,0.001791954,0.012077332,0.028137207,0.02558899,0.009132385,-0.01763916,0.020446777,-0.008583069,0.022125244,-0.012298584,-0.0037231445,0.00415802,0.0043640137,0.017288208,0.024841309,0.0140686035,-0.016082764,-0.026992798,0.0066719055,-0.01600647,-0.02822876,0.019714355,0.025497437,0.014030457,-0.022079468,0.018051147,0.012016296,-0.032073975,-0.019500732,-0.0011072159,0.03967285,-0.018692017,-0.017745972,0.01864624,0.00995636,0.034729004,-0.056488037,-0.0007972717,0.008018494,0.018112183,-0.032287598,-0.042510986,-0.032226562,0.01977539,0.028717041,0.0028457642,0.012611389,0.027832031,0.0028514862,0.008483887,0.026885986,0.005744934,-0.017837524,-0.010910034,-0.04940796,-0.0005736351,-0.0056114197,-0.0046920776,-0.03353882,0.006755829,-0.014541626,-0.03137207,0.009292603,-0.01663208,-0.003540039,0.0045280457,0.006801605,0.034606934,-0.00806427,0.0053215027,-0.02609253,-0.027496338,-0.0015115738,0.0016613007,0.021102905,-0.049316406,0.017654419,-0.01499939,-0.008773804,-0.001698494,0.011489868,0.021347046,0.02758789,0.006412506,0.03012085,-0.043029785,0.04144287,-0.030517578,0.018295288,0.010902405,-0.044799805,0.00233078,-0.02003479,-0.01146698,0.036956787,-0.020050049,-0.008979797,-0.025146484,-0.030883789,-0.0065727234,-0.047607422,0.02015686,0.03378296,0.03375244,-0.020736694,0.0011882782,-0.0013151169,-0.0032787323,-0.016906738,0.0063285828,-0.02128601,0.01777649,0.018203735,0.0051116943,-0.029403687,-0.02407837,-0.023147583,0.0047073364,-0.049102783,-0.043670654,-0.026641846,0.007911682,-0.007904053,-0.012619019,-0.023239136,-0.015167236,0.0032234192,-0.045959473,0.01625061,0.013755798,0.025054932,0.0018997192,-0.015716553,-0.0011510849,0.011131287,-0.007965088,0.030593872,0.0076446533,-0.011810303,-0.03677368,0.0023937225,0.034362793,0.027908325,-0.00049448013,-0.01007843,-0.014160156,-0.026107788,-0.062194824,-0.0072517395,-0.0011548996,-0.006958008,-0.00020194054,0.0015716553,-0.05142212,-0.0042304993,-0.018844604,0.0017671585,0.024597168,0.008651733,0.016815186,0.0008420944,0.009628296,-0.015335083,-0.022155762,-0.025146484,0.029190063,0.010604858,-0.0012722015,0.013267517,0.043029785,0.0061302185,-0.01322937,-0.0021190643,0.008148193,0.013755798,-0.02557373,-0.004436493,-0.011367798,0.014152527,-0.011764526,-0.0068855286,-0.032714844,-0.012786865,0.097351074,-0.00026249886,-0.019500732,-0.006641388,-0.025115967,0.022583008,0.021331787,-0.04574585,-0.008522034,-0.0340271,0.023391724,-0.02609253,0.024475098,0.011741638,0.016708374,-0.022155762,-0.062561035,-0.018173218,0.009536743,-0.028244019,-0.06347656,-0.017547607,-0.062408447,-0.005054474,-0.007801056,-0.020233154,0.008972168,0.01852417,-0.0119018555,-0.08288574,0.014724731,0.049835205,0.007446289,0.017837524,-0.020309448,0.013336182,0.026229858,-0.029815674,-0.013420105,0.030960083,-0.02267456,-0.008102417,-0.016525269,0.017410278,-0.0075263977,-0.021347046,0.02166748,0.00020217896,0.015022278,-0.002105713,0.008552551,-0.011009216,0.018753052,-0.007160187,0.017288208,-0.010879517,-0.01020813,0.034423828,-0.045837402,0.025283813,0.034729004,0.0028915405,-0.0017185211,0.029632568,0.026550293,-0.039978027,-0.016815186,0.023132324,-0.0025234222,0.035827637,-0.038024902,0.039794922,0.025177002,-0.014137268,0.01751709,-0.014152527,-0.027801514,-0.028045654,-0.029968262,0.029571533,0.0021400452,0.014930725,-0.013786316,0.00667572,0.018447876,-0.01247406,0.0154953,-0.01499939,-0.023040771,-0.005203247,0.007926941,-0.003189087,0.0041618347,-0.0069389343,0.024795532,0.005306244,0.038635254,0.0073623657,-0.0057258606,-0.0067634583,0.023651123,-0.016662598,0.0077209473,0.02192688,0.0073623657,0.024658203,0.014816284,0.009735107,-0.039642334,-0.012016296,-0.020309448,-0.009132385,0.0033683777,-0.016815186,-0.017532349,-0.008140564,0.0010356903,-0.010482788,-0.0385437,0.0072631836,-0.02204895,-0.019042969,-0.0016174316,-0.010986328,0.015464783,0.009140015,-0.0014162064,0.021026611,-0.0077781677,0.048309326,0.0040740967,-0.0062446594,0.025726318,0.033050537,0.011207581,-0.033447266,-0.010749817,-0.005355835,-0.0049552917,0.005634308,-0.021957397,0.0128479,0.043945312,-0.011123657,0.018112183,-0.012893677,0.0211792,-0.009101868,0.005882263,-0.015823364,0.012825012,-0.009147644,0.035949707,-0.041534424,0.018463135,0.016113281,0.002840042,-0.019302368,-0.00793457,-0.02897644,0.021514893,0.012145996,-0.0061454773,0.045013428,-0.007080078,0.020553589,-0.025787354,-0.012336731,0.011878967,-0.033691406,-0.017089844,0.034179688,0.006919861,0.0044403076,0.01876831,-0.031311035,0.036254883,-0.0357666,0.024612427,-0.007461548,0.0025463104,-0.005847931,-0.022705078,-0.02798462,-0.015167236,-0.0082473755,0.0076675415,0.004016876,0.04046631,0.023834229,0.036712646,0.05529785,0.016342163,-0.0029354095,-0.036895752,-0.030593872,0.002544403,-0.031066895,0.023712158,-0.008514404,0.045806885,0.034088135,-0.0011053085,0.032440186,0.039154053,0.036712646,0.009101868,0.017837524,-0.017364502,0.012001038,0.0019464493,0.03074646,-0.00032305717,0.037841797,-0.01586914,0.021087646,0.01499939,0.03314209,-0.035339355,0.021728516,0.0703125,0.0087509155,-0.021377563,0.040924072,-0.004043579,-0.009025574,-0.0121536255,-0.014335632,0.053375244,0.011810303,0.05429077,0.051605225,0.019729614,-0.0075912476,0.022140503,-0.029815674,-0.034729004,0.06726074,0.0262146,-0.015289307,-0.023910522,-0.009773254,0.007144928,-0.05340576,-0.028869629,0.017623901,-0.012878418,0.014709473,-0.013130188,-0.0016822815,-0.010391235,0.017730713,0.026763916,0.020233154,-0.017028809,0.027069092,0.035125732,0.00044345856,0.01940918,0.0020656586,0.023345947,-0.035217285,-0.021408081,0.013198853,0.02204895,-0.01612854,-0.011787415,0.015510559,0.005821228,0.052093506,0.037750244,-0.012039185,0.016830444,0.031707764,0.011993408,-0.012710571,0.042114258,0.04876709,0.01084137,0.037597656,0.030914307,0.03012085,-0.033447266,0.019042969,-0.0035629272,0.01159668,0.004180908,-0.0063476562,0.004760742,-0.014228821,0.013282776,0.0016508102,-0.018173218,0.019226074,0.02420044,-0.006465912,-0.005874634,-0.008331299,0.005340576,-0.006652832,-0.004219055,0.01071167,-0.018295288,0.023071289,0.002008438,0.03555298,-0.023513794,0.017364502,-0.008460999,-0.02029419,-0.005203247,0.02355957,-0.042755127,0.0021514893,-0.0028858185,0.001253128,-0.04107666,0.01725769,0.025360107,-0.011558533,0.02507019,0.00831604,0.0012617111,0.0024528503,0.017227173,0.007507324,-0.0013885498,-0.0131073,-0.020065308,0.037506104,0.04647827,0.0054512024,0.015129089,-0.02154541,-0.0027942657,0.0046157837,-0.003616333,-0.0044670105,-0.007888794,-0.021026611,-0.0262146,0.013008118,0.034942627,0.023925781,0.032836914,-0.0058059692,-0.019607544,0.0061836243,0.026428223,0.0054397583,-0.0013341904,-0.010185242,0.0211792,-0.013420105,0.049224854,0.037628174,0.01008606,0.03250122,-0.010635376,-0.02041626,0.0052757263,-0.011817932,0.03062439,-0.014434814,0.007972717,-0.009750366,0.021347046,-0.016921997,-0.025299072,0.0077590942,-0.010673523,-0.016143799,-0.026504517,0.00018799305,0.007801056,0.02507019,0.03414917,0.016357422,-0.028411865,0.064575195,-0.008911133,0.043273926,-0.0041656494,0.00009906292,0.03930664,0.028930664,0.0418396,0.03237915,0.00554657,-0.03387451,0.012992859,0.03845215,0.03451538,0.0067481995,0.005104065,-0.018417358,0.02798462,0.0034561157,0.02684021,-0.016159058,0.0008363724,0.012573242,-0.0059280396,0.0008330345,0.006690979,-0.008918762,0.0090789795,0.047973633,-0.030593872,-0.002658844,-0.020095825,-0.011291504,0.02885437,-0.004386902,0.0023899078,-0.002664566,-0.015899658,0.024261475,-0.026412964,-0.02947998,0.013366699,0.030517578,-0.041107178,-0.021148682,0.002664566,0.010879517,-0.018112183,0.031341553,0.026260376,0.003742218,0.0044288635,0.045959473,-0.01776123,0.02809143,-0.008422852,0.024246216,0.030548096,0.0037403107,-0.019012451,0.004108429,0.0038223267,-0.01953125,0.014343262,0.03387451,-0.014930725,0.0053367615,-0.00023126602,-0.018188477,0.008079529,0.0006713867,-0.014465332,0.009971619,-0.010192871,-0.010543823,-0.0019283295,0.007820129,0.0045051575,0.008773804,-0.009010315,-0.010063171,0.008872986,0.0335083,0.025634766,-0.047912598,0.0031032562,0.005580902,0.010505676,-0.026885986,-0.016845703,0.0005207062,-0.031677246,0.018875122,0.010101318,0.0055885315,0.011413574,-0.017059326,-0.0041885376,0.026504517,0.009231567,0.024749756,0.0049858093,0.0029506683,0.020126343,-0.01928711,-0.0024681091,-0.0051460266,-0.015960693,0.009643555,0.019943237,-0.005355835,-0.0259552,0.028015137,-0.00051021576,0.023223877,0.0036392212,-0.017440796,0.01537323,-0.012077332,-0.01197052,0.009796143,0.016693115,-0.014137268,-0.0062713623,-0.017852783,0.015327454,0.05343628,-0.0037593842,-0.0012197495,0.024047852,0.02217102,0.016174316,0.045074463,0.01979065,0.045043945,0.026184082,-0.022735596,-0.013664246,0.024490356,-0.007167816,-0.03729248,0.018692017,-0.00819397,-0.015586853,0.016723633,0.024459839,-0.008575439,-0.027755737,-0.022064209,-0.007095337,-0.01864624,0.019210815,-0.018188477,0.016189575,-0.020965576,-0.004436493,-0.00038170815,-0.012687683,-0.04788208,-0.023895264,-0.00038170815,-0.013381958,-0.048736572,0.0073509216,-0.027862549,0.0104522705,-0.017532349,-0.012069702,-0.015655518,0.021011353,-0.024093628,-0.005455017,0.0063705444,0.024841309,0.020111084,0.0046463013,0.015403748,-0.019973755,-0.028320312,-0.024124146,-0.003156662,-0.014801025,0.022781372,0.0085372925,0.037109375,0.01689148,0.0028057098,-0.00096035004,-0.002998352,-0.0045318604,-0.0033226013,-0.019577026,-0.013145447,0.024612427,0.019699097,-0.0071411133,-0.021514893,0.043029785,-0.020339966,-0.013931274,0.024734497,0.047607422,0.008049011,0.02696228,-0.018218994,-0.0028495789,-0.01676941,0.0025920868,-0.019454956,0.0020484924,0.012260437,-0.005744934,-0.0047454834,0.0012874603,0.020080566,-0.0135269165,-0.01576233,0.024307251,0.0017147064,-0.018737793,0.037475586,0.016479492,0.012626648,-0.0013952255,-0.017807007,0.022628784,0.045074463,0.012710571,0.008605957,-0.00095796585,0.009361267,-0.014930725,0.012840271,0.021377563,-0.017288208,-0.043518066,-0.026428223,-0.031677246,0.0135650635,0.0075645447,0.011924744,0.00019097328,0.018814087,-0.026916504,-0.021057129,-0.02368164,0.025482178,0.00019919872,-0.012512207,-0.017608643,0.004798889,0.02973938,-0.027938843,0.0071525574,-0.029052734,-0.026611328,-0.0010643005,-0.025756836,0.016662598,0.015205383,-0.0005426407,0.0054969788,-0.0014181137,-0.0022087097,-0.0010795593,0.037475586,-0.02154541,-0.0051345825,0.029159546,0.012367249,-0.0256958,0.0066833496,-0.013824463,-0.010406494,0.01902771,-0.0037269592,0.010681152,-0.02458191,0.031341553,-0.004573822,0.0017766953,0.033081055,-0.006919861,0.009460449,-0.026733398,0.01121521,-0.00037550926,0.004142761,0.036834717,-0.018157959,-0.018463135,0.004257202,-0.020523071,-0.03125,-0.00039362907,0.02217102,0.03652954,-0.008148193,0.03894043,-0.026351929,-0.017913818,0.014343262,0.0035800934,-0.02696228,-0.0026474,0.03677368,0.012825012,-0.001502037,-0.0040893555,-0.008071899,-0.035308838,-0.008224487,0.021057129,-0.0031986237,-0.010658264,0.02456665,0.01663208,0.050231934,-0.0033740997,0.022140503,0.01626587,0.006275177,0.020431519,-0.0011539459,0.049743652,-0.006427765,-0.039520264,0.010406494,-0.0041275024,-0.02468872,-0.014060974,-0.010406494,0.0027046204,-0.044677734,0.01524353,-0.0038967133,0.04135132,-0.023101807,0.009887695,-0.024612427,-0.0014362335,-0.032287598,-0.013046265,-0.029708862,0.014839172,0.03677368,0.0027542114,0.021774292,0.010848999,-0.01914978,0.018737793,0.04345703,-0.00422287,-0.02116394,-0.013473511,0.015586853,0.0072135925,0.007648468,0.018814087,-0.005290985,-0.022476196,0.008308411,-0.022613525,0.013114929,-0.004722595,0.010192871,-0.0035953522,-0.00040364265,-0.0019569397,0.028564453,-0.0010528564,-0.0039634705,0.009208679,0.011581421,0.042053223,0.03111267,-0.016571045,0.023620605,0.019485474,-0.039276123,0.05307007,-0.0009498596,0.028320312,-0.027801514,-0.007858276,-0.037963867,-0.03201294,-0.011421204,0.011810303],"createdAt":"2026-04-18T18:44:49.028Z","updatedAt":"2026-04-24T02:32:12.805Z","lastSeenAt":"2026-04-24T02:32:12.805Z","tsv":"'/api/v1/charges/276':48,173 '/request':13,28 '0.02':12,27,76,131 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':120 '6':126 'Base network API' 'USDC API access' 'accept':103 'access':7,22,38,177 'addit':204 'advertis':157 'ai':62,164 'amount':117,143 'analyt':61,163 'api':6,21,37,88,176,187 'application/json':151 'base':9,24,84,114,122 'behind':172 'broad':159 'call':4,19 'caller':139 'catalog':160 'categori':70 'challeng':97 'commit':93 'confirm':98 'connect':195 'contract':111,212 'crawl':184 'data':60 'decim':127 'detail':182 'doc':185 'document':180,202 'endpoint':32,53,72,100,162,216 'equal':130 'etc':168 'exact':136,210 'exampl':207 'financ':65,166 'fix':142 'function':171 'geocod':167 'infer':165 'infrastructur':68 'input/output':211 'json-response' 'key':89 'label':174 'learn':64 'limit':91 'live':102 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':63 'mani':52 'max':116 'mean':137 'micropayment API' 'mime':148 'network':85 'no-api-key' 'no-rate-limit' 'note':152 'offer':54 'one':50 'page':190 'particular':215 'pay':2,17,140 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':79 'payload':208 'payment':42,108,133 'per':3,18,77,144 'platform':57,156 'post':104 'premium':5,20,36,175 'price':74,186 'prompt':197 'protocol':43 'provid':35 'rate':90 'readm':189 'remain':217 'request':78,105,145 'requir':94,118 'resourc':46 'respons':147 'return':192 'schema':205 'scheme':134 'settl':107 'span':59 'specif':45,170 'technic':201 'type':149 'unclear':218 'unit':123 'usdc':15,30,81,110,129 'usdc-base' 'util':69 'via':10,25,39 'wallet':196 'web3':66 'without':203 'x402':11,26,41,96 'x402 API' 'x402-payment'","prices":[{"id":"f263b819-588a-41fd-8586-07dc1e146d9b","listingId":"a7e77847-7ace-4f41-b257-042bfa82d65f","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/charges/276","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:49.028Z"}],"sources":[{"listingId":"a7e77847-7ace-4f41-b257-042bfa82d65f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/276","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:49.028Z","lastSeenAt":"2026-04-24T02:32:12.805Z"}],"details":{"listingId":"a7e77847-7ace-4f41-b257-042bfa82d65f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/276 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/charges/276"},{"claim":"USDC on Base network, asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/276"},{"claim":"maxAmountRequired is 20000 base units = $0.02 USDC (6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/charges/276"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402 protocol experimentation at low cost ($0.02/call)","Scenarios requiring no signup, no rate limits, and instant access"],"notFor":["Users needing detailed API documentation or well-defined input/output schemas","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.361Z"},"updatedAt":"2026-04-24T02:32:12.805Z"}}