{"id":"f5d6585b-45fc-4e0f-a93c-5ff29763f636","shortId":"AjYJxQ","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 suite of 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/2` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made per-request with no API keys, no rate limits, and no minimum commitments required. The platform accepts the x402 \"exact\" payment scheme with a 300-second timeout window.\n\nNote that while the landing page lists many endpoints across multiple categories, the specific function of `/api/v1/inbox/2` (labeled \"Premium API Access\") is not clearly documented — it does not appear in the public endpoint catalog on the homepage. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. The actual behavior of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","lowpaymentfee"],"warnings":["The endpoint /api/v1/inbox/2 ('Premium API Access') does not appear in the provider's public endpoint catalog — its actual functionality is unknown.","No OpenAPI schema, request format, or response examples are available for any endpoint.","Documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content.","The broad catalog of 16+ endpoints listed on the homepage cannot be independently verified as functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing, but the specific endpoint /api/v1/inbox/2 has no documentation, no request/response schema, and no examples. The landing page lists many endpoints but this one is absent from the catalog. Docs/pricing/README pages are empty beyond a wallet connect prompt.","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":"2026-04-21T21:34:49.709Z","embedding":[-0.020462036,-0.026870728,0.046905518,0.020553589,0.02708435,-0.028366089,-0.020370483,0.044952393,0.06506348,-0.061920166,0.028930664,-0.04360962,-0.022888184,-0.030883789,-0.012023926,0.023483276,-0.00283432,0.004337311,-0.046539307,0.037078857,-0.00014197826,-0.012512207,-0.021469116,0.04135132,-0.0024375916,-0.0335083,-0.010643005,-0.0074272156,-0.0025196075,-0.041381836,0.05053711,-0.02758789,0.01448822,0.016418457,-0.013008118,-0.0025596619,0.00044369698,0.04058838,0.026931763,-0.016662598,-0.025222778,-0.044799805,0.01586914,-0.019302368,-0.05581665,-0.008605957,0.010169983,-0.0048561096,-0.00705719,0.017837524,-0.02885437,0.0044174194,-0.0025043488,-0.0011968613,0.019241333,0.017868042,0.0045318604,0.010971069,0.012252808,0.0115356445,-0.005344391,-0.05508423,-0.02986145,0.0074043274,-0.00050497055,0.046783447,-0.0035953522,0.05126953,-0.00086307526,0.07141113,0.036621094,0.047454834,0.024932861,0.0052375793,0.016204834,-0.020050049,-0.003686905,0.059143066,-0.011749268,-0.008857727,-0.0053138733,-0.009788513,-0.056030273,-0.0012426376,-0.017547607,-0.056671143,-0.014556885,0.034576416,-0.045532227,0.019226074,-0.07470703,-0.024017334,-0.018814087,0.005268097,0.004135132,-0.003917694,0.0032081604,0.0058403015,-0.020309448,0.03640747,-0.0014152527,-0.04598999,0.0158844,-0.0017576218,0.044891357,0.047668457,0.021209717,0.01802063,0.013946533,-0.013618469,-0.04977417,0.014694214,-0.0317688,-0.0110321045,0.0035858154,0.0047416687,-0.005580902,0.030853271,-0.03387451,0.016296387,-0.03164673,0.041259766,0.002450943,0.0059661865,0.004688263,-0.0592041,-0.011360168,0.0017766953,-0.03378296,-0.00299263,0.015174866,0.014862061,0.03050232,-0.02748108,-0.04650879,-0.006095886,-0.021774292,-0.012054443,-0.047424316,-0.035461426,0.036315918,-0.03161621,0.022583008,0.027511597,-0.09057617,-0.019897461,-0.045715332,-0.014717102,-0.016296387,-0.0062065125,-0.0066566467,0.036468506,-0.020523071,-0.030853271,-0.018096924,-0.011665344,0.020721436,0.027908325,-0.017822266,0.043701172,-0.01550293,0.00945282,0.01197052,-0.014930725,0.013244629,0.024917603,-0.0010442734,-0.08947754,-0.0836792,-0.02861023,0.0022792816,-0.02545166,-0.023544312,-0.001996994,0.009857178,-0.05923462,-0.026626587,-0.002210617,-0.00043821335,-0.040740967,0.0077323914,-0.021102905,0.023605347,-0.018417358,-0.036712646,-0.018493652,-0.014595032,0.053222656,0.014007568,0.02861023,0.043182373,-0.018432617,0.07519531,0.049438477,-0.031204224,-0.02999878,0.017837524,-0.02130127,0.021438599,0.012039185,0.0045433044,-0.03665161,0.02645874,0.06829834,-0.007972717,-0.0067634583,-0.009803772,-0.037719727,-0.04638672,-0.036010742,0.023223877,0.003200531,-0.0052337646,0.04699707,-0.050048828,-0.05496216,-0.027374268,0.0040740967,0.01651001,0.05609131,0.0135269165,0.021636963,0.01121521,0.016174316,-0.039855957,0.03994751,0.034179688,0.0013055801,-0.029006958,-0.017089844,0.028442383,0.028442383,-0.011878967,0.009674072,-0.0037937164,0.034729004,0.00038599968,0.016845703,0.021942139,0.000056743622,-0.017456055,-0.025024414,-0.009887695,0.019104004,0.012481689,-0.019989014,-0.030822754,-0.0748291,0.045166016,0.033935547,0.04928589,-0.0042877197,-0.0015048981,-0.023025513,-0.006095886,-0.060424805,0.062194824,0.08013916,0.0009880066,-0.02116394,0.016098022,-0.01802063,-0.026046753,0.022506714,-0.00242424,-0.03845215,-0.0026721954,0.008712769,-0.051330566,-0.00868988,-0.0035266876,0.021514893,0.06222534,-0.002275467,-0.044525146,-0.021102905,-0.0016775131,-0.018005371,-0.024871826,0.0062942505,-0.023773193,0.011520386,0.019897461,-0.01537323,0.026550293,-0.0072669983,0.025558472,-0.016799927,0.006416321,-0.03213501,-0.023086548,-0.0025138855,0.0016450882,-0.041900635,0.008796692,-0.01499939,0.06427002,-0.04046631,0.035980225,-0.003255844,0.017745972,0.0345459,0.023086548,-0.05230713,0.008422852,0.029251099,0.0335083,0.06347656,0.008216858,-0.02885437,-0.011390686,0.0690918,-0.01386261,-0.003917694,0.012367249,-0.005077362,0.02204895,-0.010383606,-0.04650879,-0.037841797,-0.012619019,-0.028045654,0.024261475,-0.019104004,0.027542114,-0.009963989,0.017333984,-0.005756378,-0.004558563,-0.0284729,0.030075073,-0.030670166,0.008346558,-0.016418457,-0.030670166,0.01789856,0.016143799,-0.006755829,-0.0043754578,0.036621094,0.030349731,-0.012199402,-0.044891357,-0.022750854,-0.013259888,-0.00844574,0.026290894,0.03314209,0.018493652,0.043273926,-0.0345459,-0.00088071823,0.042938232,0.00687027,0.040008545,-0.0025348663,0.0051956177,-0.080200195,-0.040649414,-0.023742676,-0.047332764,0.0116119385,0.032440186,0.0052871704,0.041809082,0.0013923645,-0.043151855,-0.06616211,0.03918457,-0.05142212,0.014373779,0.03555298,-0.0030994415,-0.035369873,-0.0003297329,0.0064048767,0.01525116,0.034484863,0.009414673,0.014877319,0.0847168,0.042053223,-0.006450653,0.023117065,0.023391724,0.030258179,0.002292633,-0.022964478,-0.01902771,0.00969696,0.03286743,-0.029144287,-0.025268555,-0.07489014,0.0496521,0.029937744,0.078186035,0.024902344,0.018859863,0.031951904,-0.006389618,-0.0058250427,-0.027374268,-0.02128601,-0.04055786,-0.03930664,0.039489746,-0.019226074,0.0075531006,-0.027648926,0.036895752,-0.017349243,0.022109985,-0.01776123,0.03894043,0.0017108917,0.011192322,0.011962891,0.0071525574,0.04748535,0.05984497,-0.039794922,0.027053833,0.02861023,-0.025970459,0.011634827,0.042816162,-0.014305115,-0.01448822,-0.07104492,-0.037719727,-0.010101318,-0.0070114136,-0.05529785,0.0031032562,-0.005958557,0.01259613,0.041137695,-0.022735596,-0.00522995,-0.0070114136,-0.02418518,-0.06048584,-0.0024471283,-0.04953003,0.01914978,0.034118652,-0.01979065,-0.013130188,0.005634308,-0.019332886,-0.004135132,0.0017442703,0.037200928,-0.014503479,-0.061157227,0.030349731,-0.00029611588,0.011428833,0.025543213,0.038146973,0.008407593,0.014770508,0.061584473,0.015052795,-0.024856567,-0.045654297,0.032562256,-0.05227661,0.012084961,0.013679504,-0.021087646,0.011688232,0.010551453,-0.046936035,-0.032714844,0.013214111,-0.013839722,-0.0011959076,0.023605347,-0.028427124,-0.021224976,-0.050354004,-0.018997192,0.005332947,0.06384277,0.025115967,-0.00724411,-0.052337646,-0.0126953125,0.017822266,0.0048942566,0.031555176,-0.015335083,-0.018203735,-0.010803223,-0.028961182,-0.017181396,-0.016601562,0.027908325,0.01309967,-0.0068244934,0.034576416,0.010658264,0.0095825195,-0.0013284683,0.010124207,0.018753052,-0.034240723,-0.011024475,-0.013206482,0.040985107,0.016647339,-0.009216309,-0.0413208,0.04147339,0.027511597,0.039886475,-0.013717651,-0.010032654,-0.002861023,0.01789856,0.018737793,-0.018478394,-0.015357971,0.0017127991,-0.0657959,-0.075927734,0.03942871,-0.023284912,0.022323608,0.014411926,0.011665344,0.012039185,-0.017501831,0.020553589,0.008491516,-0.025039673,-0.003112793,-0.022018433,-0.020355225,0.0010852814,-0.008331299,-0.0048446655,0.02130127,-0.0055122375,0.0046844482,0.0026245117,-0.014343262,0.03213501,-0.0009217262,-0.009712219,0.034973145,-0.0018644333,0.023849487,0.035003662,0.011985779,-0.0440979,0.026901245,-0.01260376,0.025848389,-0.009559631,0.048217773,0.038909912,0.0071372986,-0.016906738,-0.0046577454,-0.022399902,-0.020996094,0.014915466,0.0006790161,0.020462036,-0.011932373,-0.051971436,0.012619019,0.0013742447,-0.035247803,-0.029144287,0.020751953,0.012832642,-0.044769287,0.0152282715,0.020736694,0.056427002,-0.02545166,0.017944336,0.014480591,0.034973145,0.040374756,0.0077323914,-0.021957397,0.008094788,0.0012693405,0.011558533,-0.014144897,-0.0044174194,0.02418518,0.0030498505,0.021270752,0.041381836,0.017486572,-0.02268982,-0.029281616,0.0023078918,-0.017547607,-0.008262634,0.013214111,0.03050232,0.024841309,-0.033050537,0.013313293,0.0034999847,-0.017944336,-0.017486572,-0.024169922,0.030960083,-0.004398346,-0.0009765625,0.026306152,0.006214142,0.013473511,-0.041503906,-0.0065231323,0.008163452,0.008262634,-0.025131226,-0.05722046,-0.04727173,0.011978149,0.018295288,0.0070266724,0.032440186,0.02986145,-0.007106781,-0.004425049,0.019195557,0.008407593,-0.021392822,-0.007598877,-0.037231445,-0.015586853,-0.00504303,0.008583069,-0.04260254,0.016662598,0.0023021698,-0.022323608,-0.010627747,-0.009742737,-0.003250122,-0.01146698,0.006336212,0.056243896,0.003862381,0.019302368,-0.009895325,-0.029281616,-0.009895325,-0.007286072,0.025238037,-0.052642822,0.024551392,-0.0021858215,-0.0037136078,-0.00002861023,0.009544373,0.012420654,0.02078247,0.015090942,0.02885437,-0.03616333,0.044769287,-0.018966675,0.02885437,-0.002035141,-0.03353882,-0.0007276535,-0.03024292,-0.00969696,0.03289795,-0.025604248,-0.033111572,-0.026397705,-0.020324707,-0.0036067963,-0.040893555,0.021835327,0.030456543,0.03515625,-0.028121948,0.010391235,0.012557983,0.0031795502,-0.018432617,-0.0020122528,0.00095558167,0.01991272,0.0284729,-0.0065574646,-0.01411438,-0.018066406,-0.020568848,-0.0040664673,-0.054870605,-0.057739258,-0.009208679,0.008262634,0.005378723,-0.012557983,-0.03643799,-0.034484863,0.006416321,-0.0423584,0.015602112,-0.0056381226,0.017089844,-0.000374794,-0.033691406,0.00058841705,0.018096924,-0.010864258,0.029190063,0.0018796921,0.0026340485,-0.0345459,0.019607544,0.023834229,0.0088272095,-0.0000025629997,-0.015960693,-0.003856659,-0.03515625,-0.056854248,-0.011871338,-0.00774765,-0.010070801,-0.016326904,0.002111435,-0.047180176,0.011161804,-0.009284973,-0.013191223,0.02684021,0.008560181,-0.010482788,-0.022491455,0.015213013,-0.009490967,-0.015991211,-0.023483276,0.007671356,0.011306763,-0.0026454926,0.03125,0.05065918,0.0031585693,-0.024337769,0.02418518,0.0017700195,0.01725769,-0.0141067505,0.00207901,-0.023956299,0.0014371872,-0.0178833,-0.023223877,-0.03768921,-0.007751465,0.077697754,0.0044822693,-0.0008006096,-0.019821167,-0.014801025,0.0041885376,0.03060913,-0.03050232,-0.0038337708,-0.031585693,0.00970459,-0.022979736,0.03741455,0.007835388,0.019699097,-0.01272583,-0.04827881,-0.009338379,0.007545471,-0.0045051575,-0.057434082,-0.015129089,-0.06616211,0.008010864,-0.022369385,-0.037628174,0.0011463165,0.009803772,-0.008964539,-0.085876465,0.0050621033,0.052612305,0.0031585693,0.03152466,-0.0046157837,0.010856628,0.01663208,-0.0064315796,-0.00026392937,0.025878906,-0.036376953,-0.027542114,-0.013946533,0.022323608,0.008903503,-0.0124435425,0.022949219,0.008560181,0.0181427,-0.01802063,0.023071289,-0.010894775,0.020355225,-0.027832031,0.022445679,-0.014198303,-0.012687683,0.026550293,-0.045776367,0.024780273,0.020935059,-0.009719849,-0.005207062,0.029785156,0.035736084,-0.02746582,-0.026031494,0.009544373,0.0068969727,0.020568848,-0.02822876,0.042907715,0.0068969727,-0.016815186,0.014328003,-0.007511139,-0.0178833,-0.02609253,-0.02758789,0.020355225,-0.00333786,0.017288208,-0.015052795,-0.0045394897,0.016616821,0.0011644363,0.010604858,-0.005886078,-0.01687622,-0.018508911,-0.006095886,-0.008216858,0.009590149,0.005012512,0.03173828,0.01701355,0.023391724,-0.003929138,-0.017364502,-0.0019445419,0.02130127,-0.0010299683,0.0024204254,0.03125,0.015792847,0.012062073,0.016082764,0.0049819946,-0.041900635,0.0030498505,-0.02192688,-0.010391235,0.005947113,-0.026611328,-0.010498047,-0.006038666,0.0013980865,-0.012435913,-0.031982422,0.0045204163,-0.02229309,-0.021255493,0.0019989014,-0.0044517517,0.027511597,0.009933472,0.0027923584,0.009208679,0.0028038025,0.04510498,-0.0038070679,-0.023834229,0.015281677,0.020950317,0.015686035,-0.04220581,-0.01512146,0.0016050339,0.0027713776,0.0005097389,-0.03543091,0.003709793,0.037017822,-0.017669678,0.017150879,-0.0078048706,0.035003662,-0.011955261,0.013397217,-0.01373291,0.014877319,-0.011810303,0.018737793,-0.032226562,0.019119263,0.030044556,0.005622864,-0.013053894,-0.029220581,-0.035308838,0.02722168,0.008613586,-0.012962341,0.05609131,0.014343262,0.024246216,-0.025024414,-0.014022827,-0.0016508102,-0.03930664,-0.01940918,0.026809692,0.0011758804,0.009109497,0.013259888,-0.019180298,0.019073486,-0.034851074,0.011016846,0.004310608,-0.00032424927,-0.012008667,-0.010345459,-0.01676941,0.01725769,-0.026779175,-0.00029969215,-0.0032520294,0.059631348,0.031036377,0.047210693,0.040161133,0.0037956238,-0.0022144318,-0.045135498,-0.027191162,0.006477356,-0.024551392,0.010467529,-0.016174316,0.051116943,0.0473938,-0.0074653625,0.029296875,0.048217773,0.04748535,-0.013298035,0.020187378,-0.020141602,0.0063819885,-0.005405426,0.029708862,0.0047683716,0.043701172,-0.02949524,0.025558472,0.03390503,0.020401001,-0.015159607,0.032409668,0.064819336,0.010826111,0.0027942657,0.008285522,0.0033473969,-0.016708374,-0.002298355,-0.022750854,0.04486084,0.018447876,0.06390381,0.031555176,0.00831604,-0.008155823,0.021484375,-0.03262329,-0.014373779,0.056030273,0.017807007,-0.020111084,-0.009887695,-0.0017108917,-0.002954483,-0.044311523,-0.02935791,0.024734497,0.0012540817,0.0082092285,-0.014053345,-0.004081726,-0.016311646,0.014160156,0.019439697,0.011817932,0.0049819946,0.026794434,0.017929077,0.0075912476,0.03024292,0.0029582977,0.036590576,-0.030151367,-0.018753052,0.020050049,0.015464783,-0.006702423,0.0017080307,0.03314209,-0.000688076,0.04449463,0.032348633,-0.020095825,0.012779236,0.021240234,0.0033283234,0.0039901733,0.07196045,0.029327393,0.012016296,0.027542114,0.032958984,0.038024902,-0.02204895,0.027862549,-0.0036563873,0.0053215027,-0.0074653625,-0.022109985,-0.004497528,0.0033683777,0.02078247,-0.002450943,-0.01876831,0.0043029785,0.022827148,-0.0020923615,-0.0066947937,-0.0032596588,-0.00034284592,-0.011520386,-0.009803772,0.016067505,-0.019241333,0.030426025,0.007858276,0.021820068,-0.011917114,0.006336212,-0.0040397644,-0.0206604,0.00047707558,0.038330078,-0.033294678,0.00831604,0.0029201508,-0.007133484,-0.046325684,0.008476257,0.018585205,-0.015159607,0.026504517,0.013450623,-0.01802063,0.011016846,0.017654419,0.005428314,0.0030536652,-0.008583069,-0.027893066,0.028182983,0.042419434,0.00756073,0.01309967,-0.021575928,-0.010673523,0.00554657,-0.0059394836,-0.013122559,-0.004714966,-0.008277893,-0.04043579,0.010948181,0.028121948,0.027359009,0.03781128,-0.016113281,-0.017974854,0.006790161,0.02772522,0.01171875,0.0032863617,0.0028057098,0.021774292,-0.017166138,0.044891357,0.04940796,0.0141067505,0.045288086,-0.0042800903,-0.0025310516,0.002292633,-0.018173218,0.01272583,-0.026306152,-0.0010890961,-0.011230469,0.025817871,-0.016113281,-0.028823853,0.014381409,-0.0075645447,-0.02015686,-0.017059326,0.011299133,-0.0020523071,0.043060303,0.039642334,0.012435913,-0.039642334,0.066711426,-0.01914978,0.03933716,0.0010166168,-0.02029419,0.05130005,0.0345459,0.023330688,0.018936157,0.013496399,-0.043701172,0.018829346,0.039642334,0.028656006,0.016448975,-0.01259613,-0.016693115,0.03161621,-0.0027923584,0.01838684,-0.008720398,-0.0014734268,0.009994507,-0.0015573502,-0.004447937,-0.004650116,0.0054779053,0.0027542114,0.03677368,-0.026168823,-0.005554199,-0.028335571,-0.013809204,0.041503906,-0.0102005005,-0.0070991516,-0.00894165,-0.018081665,0.0046844482,-0.02154541,-0.027114868,0.013023376,0.024093628,-0.049713135,-0.014427185,0.019958496,0.00022792816,-0.018539429,0.04336548,0.016220093,-0.0064697266,0.012565613,0.035888672,-0.013877869,0.011817932,-0.022384644,0.028579712,0.036712646,0.0054016113,-0.017456055,0.0014562607,0.007980347,-0.009239197,0.010971069,0.03881836,0.003873825,0.0035762787,-0.01008606,-0.010177612,0.00018799305,0.00025248528,-0.01838684,0.0045814514,-0.015022278,-0.007987976,0.008323669,0.020507812,0.001663208,0.012069702,-0.03111267,-0.0178833,0.013069153,0.050994873,0.03125,-0.034118652,-0.007286072,-0.005012512,0.009757996,-0.026626587,-0.0032482147,-0.021453857,-0.023712158,0.021514893,0.0181427,0.007545471,0.022872925,-0.023956299,-0.0011854172,0.028793335,0.0021362305,0.007297516,0.0073127747,-0.019958496,0.0024051666,-0.012496948,-0.0047721863,-0.01586914,-0.003709793,0.0024909973,0.013290405,0.0068130493,-0.023727417,0.029067993,-0.00957489,0.019363403,-0.009109497,0.0009384155,0.0234375,-0.004058838,-0.015068054,0.0000014901161,0.012008667,-0.012268066,-0.0077400208,-0.02696228,0.013572693,0.043151855,-0.012199402,-0.0075912476,0.029251099,0.01512146,0.029647827,0.051879883,0.002878189,0.044647217,0.023864746,-0.027832031,-0.02571106,0.017807007,-0.008087158,-0.027297974,0.016464233,-0.013465881,-0.018676758,0.01586914,0.004058838,0.0027256012,-0.021469116,-0.008682251,-0.02468872,-0.030212402,0.01576233,-0.013076782,0.020019531,-0.014823914,-0.014167786,0.003780365,-0.02609253,-0.052856445,-0.015022278,0.00053596497,-0.0055236816,-0.069885254,-0.002111435,-0.033081055,0.019592285,-0.0154953,-0.008468628,-0.026229858,0.033813477,-0.01737976,-0.0060768127,0.0024642944,0.021743774,0.027938843,0.015037537,0.022628784,-0.032165527,-0.03555298,-0.01398468,0.012771606,-0.011108398,0.018951416,0.008262634,0.03515625,0.006958008,-0.009361267,0.0046463013,-0.016540527,0.001001358,-0.014823914,-0.03253174,-0.030029297,0.02470398,0.014663696,-0.000688076,0.0056915283,0.041656494,-0.013946533,-0.0042762756,0.021972656,0.027542114,0.00085258484,0.0211792,-0.022521973,-0.0037136078,-0.018508911,0.004184723,-0.016616821,0.008796692,0.0023117065,0.011878967,-0.019256592,0.018356323,0.033569336,-0.0098724365,-0.0012197495,0.018798828,-0.0019702911,-0.018157959,0.029571533,0.003288269,0.001200676,-0.008850098,-0.0082092285,0.025878906,0.06512451,0.017410278,0.010276794,-0.00073575974,0.008773804,-0.0099487305,-0.004825592,0.006198883,-0.030288696,-0.029281616,-0.01802063,-0.023803711,0.018127441,-0.0049324036,0.0104599,0.002193451,0.024124146,-0.013549805,-0.018875122,-0.016540527,0.031921387,-0.0074806213,-0.006313324,-0.004463196,0.0014677048,0.02015686,-0.023666382,-0.005344391,-0.032470703,-0.04736328,-0.014373779,-0.011054993,0.030136108,0.013900757,-0.010597229,0.004535675,-0.00074100494,0.0038757324,-0.012832642,0.0231781,-0.020385742,0.005264282,0.013549805,0.008766174,-0.034332275,0.025741577,-0.020095825,-0.016952515,0.0063171387,-0.009025574,0.015304565,-0.010284424,0.033599854,0.0024967194,-0.00030493736,0.042266846,0.0035629272,0.007083893,-0.02897644,0.0076065063,-0.0019607544,-0.013328552,0.039398193,-0.012245178,-0.017059326,-0.008415222,-0.016311646,-0.0154953,0.012481689,0.014053345,0.021499634,0.0022392273,0.03756714,-0.013893127,0.0035820007,0.024856567,0.014503479,-0.023742676,0.005672455,0.031143188,0.011955261,0.0018997192,-0.0024089813,-0.006336212,-0.034332275,-0.00818634,0.005886078,0.0018234253,-0.009170532,0.028747559,0.006904602,0.03463745,-0.0050468445,0.014373779,0.013656616,0.01083374,0.033721924,0.009819031,0.03668213,-0.0074920654,-0.01991272,-0.0051116943,0.0013380051,-0.024047852,-0.0044441223,-0.001452446,0.006591797,-0.032073975,0.012863159,0.0009441376,0.030792236,-0.009063721,0.014823914,-0.028640747,-0.0043754578,-0.037139893,-0.014854431,-0.043029785,0.002571106,0.03074646,0.0043258667,0.027435303,0.001627922,-0.02519226,0.030395508,0.044006348,0.003768921,-0.028442383,-0.018844604,-0.0018444061,-0.0024528503,0.006958008,0.011238098,-0.01374054,-0.035705566,0.007419586,-0.023910522,0.0059013367,-0.004714966,0.017425537,0.009979248,0.004131317,-0.0030574799,0.012207031,-0.0040893555,-0.013137817,0.0067329407,0.003736496,0.025268555,0.027618408,-0.0040359497,0.022644043,0.025054932,-0.046722412,0.062286377,-0.0033779144,0.038513184,-0.016723633,0.022964478,-0.03387451,-0.025848389,-0.007133484,0.010765076],"createdAt":"2026-04-21T18:32:20.620Z","updatedAt":"2026-04-22T10:32:50.355Z","lastSeenAt":"2026-04-22T10:32:50.355Z","tsv":"'/api/v1/inbox/2':112,193 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '300':173 '6':143 'accept':165 'access':118,197 'across':54,186 'actual':242 'addit':239 'advertis':123 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,153,196 'appear':205 'base':8,27,103,129,136 'base network api' 'behavior':243 'broad':50 'call':4,23 'catalog':210 'categori':56,188 'challeng':122 'classif':71 'classification' 'clear':200 'commit':161 'connect':234 'content':240 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':144 'doc':224 'document':201 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,185,209,247 'equal':138 'estim':82 'exact':168 'exampl':221 'exchang':77 'export':62 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':191 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':140 'homepag':213 'infrastructur':84 'insight':63 'key':154 'label':194 'land':181 'learn':66 'limit':157 'list':114,183 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':147 'mani':184 'maxamountrequir':125 'metric':59 'micropayment api' 'minim':233 'minimum':160 'multipl':187 'network':104 'note':177 'offer':10,29 'openapi':217 'page':182,228 'paid':98 'particular':246 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':145,169 'per':3,22,96,149 'per-request':148 'platform':6,25,46,164 'premium':116,195 'price':75,93,225 'prompt':236 'protocol':108 'provid':48 'public':208 'quot':80 'rate':78,156 'readm':227 'remain':248 'report':60 'request':97,150 'request/response':220 'requir':162 'resolv':230 'schema':218 'scheme':170 'second':174 'sentiment':67 'sentiment-analysis' 'specif':110,190 'suit':51 'summar':70 'text':69 'text-summarization' 'timeout':175 'token':79 'unclear':249 'unit':130 'usdc':9,28,100,132,141 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105 'wallet':235 'web3':74 'window':176 'x402':43,107,121,167 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"456b8069-f6bc-4978-ac39-45d4bf5acf49","listingId":"f5d6585b-45fc-4e0f-a93c-5ff29763f636","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.620Z"}],"sources":[{"listingId":"f5d6585b-45fc-4e0f-a93c-5ff29763f636","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.620Z","lastSeenAt":"2026-04-22T10:32:50.355Z"}],"details":{"listingId":"f5d6585b-45fc-4e0f-a93c-5ff29763f636","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/2"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint is described as 'Premium API Access' in the x402 challenge","source_url":"https://lowpaymentfee.com/api/v1/inbox/2"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call payment basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access with per-call crypto payments","Developers who want to avoid subscription commitments for occasional API usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integration","Applications that cannot make x402 USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.738Z"},"updatedAt":"2026-04-22T10:32:50.355Z"}}