{"id":"2db0b39a-3446-4c18-abdb-bb82cd5d1ac6","shortId":"sKaVvX","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 site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/288` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no upfront commitments are required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The site's landing page lists many API paths but does not describe their input parameters or output formats. Without documentation, it is unclear what payload to send or what response to expect from `/api/v1/charges/288` specifically.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","premium api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/charges/288 ('Premium API Access') is unclear — it does not correspond to any named endpoint on the landing page","Cannot determine expected request body or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/288","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/288","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no description of what this specific endpoint does beyond the generic label 'Premium API Access'. The listing is effectively a stub.","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":"2026-04-19T03:47:13.499Z","embedding":[-0.022033691,-0.038909912,0.03567505,0.017532349,0.011856079,-0.030273438,-0.026763916,0.029525757,0.064208984,-0.066833496,0.03201294,-0.042297363,-0.027679443,-0.03817749,-0.02279663,0.012496948,-0.0069465637,0.0121536255,-0.043304443,0.027496338,0.023803711,-0.02355957,-0.014022827,0.038208008,-0.0020923615,-0.036071777,-0.012290955,-0.0077323914,-0.009269714,-0.03366089,0.02104187,-0.025756836,-0.008926392,0.01222229,-0.014198303,-0.020507812,-0.0069847107,0.041229248,0.032989502,-0.0027866364,0.0054473877,-0.061279297,0.0035820007,-0.0048713684,-0.053100586,-0.0058631897,0.009963989,-0.01184082,-0.008110046,0.0017910004,-0.032562256,-0.00466156,-0.0068740845,-0.0024089813,0.009643555,0.015777588,-0.011123657,-0.008293152,0.0053520203,0.015411377,-0.00472641,-0.070495605,-0.015052795,-0.009788513,0.0042381287,0.060546875,-0.004360199,0.05279541,0.0046157837,0.057861328,0.052124023,0.05218506,0.037506104,0.014709473,0.00957489,-0.006702423,-0.009742737,0.056518555,-0.010520935,0.00058317184,-0.030212402,-0.00045776367,-0.052764893,-0.008041382,-0.023132324,-0.036712646,-0.022399902,0.016021729,-0.026901245,0.01625061,-0.061340332,0.0029506683,-0.019851685,0.0048980713,0.0031929016,0.006210327,-0.009986877,0.033599854,-0.0103302,0.013908386,0.003616333,-0.038360596,0.014465332,0.016845703,0.048095703,0.047851562,0.027420044,0.0362854,0.0000487566,-0.029449463,-0.01739502,0.019744873,-0.0138168335,-0.01600647,0.011955261,0.017929077,-0.018478394,0.020721436,-0.026931763,0.013549805,-0.046051025,0.03604126,0.02734375,-0.01777649,0.022583008,-0.047027588,-0.00944519,0.022857666,-0.026397705,-0.0037250519,0.031402588,0.011642456,0.03378296,-0.026351929,-0.023880005,-0.008354187,-0.020263672,-0.022506714,-0.047821045,-0.028396606,0.04006958,-0.02142334,0.031707764,0.035858154,-0.09710693,-0.016052246,-0.03189087,0.014579773,-0.037109375,-0.006542206,-0.0126953125,0.026000977,-0.016540527,-0.017440796,-0.02658081,-0.022415161,-0.0017433167,0.03201294,-0.025360107,0.050964355,-0.006504059,0.023971558,0.0063285828,0.0012054443,0.031219482,0.035095215,-0.0015668869,-0.06567383,-0.07696533,-0.032073975,-0.013389587,-0.022613525,-0.032226562,-0.0064697266,0.009140015,-0.063964844,-0.020187378,-0.013328552,-0.0018444061,-0.036102295,-0.0074806213,-0.02734375,0.026153564,-0.0045318604,-0.073913574,-0.014251709,-0.02218628,0.06817627,0.021911621,0.009887695,0.027526855,-0.011230469,0.055877686,0.012840271,-0.03060913,-0.04156494,0.027496338,-0.015281677,0.028579712,0.0043525696,-0.00067949295,-0.03277588,0.04107666,0.05947876,0.020309448,-0.026947021,-0.0016956329,-0.058380127,-0.04675293,-0.04953003,0.0043563843,0.00045275688,0.011268616,0.036102295,-0.030700684,-0.041381836,0.00016844273,0.012763977,0.004924774,0.046966553,0.01586914,-0.00699234,0.00699234,0.007820129,-0.032806396,0.04348755,0.026168823,0.008850098,-0.022613525,-0.03237915,0.017166138,0.023910522,-0.03540039,0.0032138824,-0.02230835,0.020721436,0.016860962,0.02684021,0.025558472,-0.014465332,-0.01991272,-0.024917603,-0.0033569336,0.028579712,0.011352539,-0.03930664,-0.050750732,-0.07446289,0.052368164,0.033966064,0.04647827,0.00025892258,0.0104599,-0.02420044,-0.018463135,-0.07598877,0.054718018,0.08062744,-0.01158905,-0.01939392,0.005168915,-0.0107803345,-0.030822754,-0.0027809143,-0.012420654,-0.031036377,-0.025665283,0.0070266724,-0.04434204,0.011367798,0.009963989,0.027572632,0.062927246,-0.0104599,-0.05895996,-0.0340271,0.003124237,0.0019283295,-0.01777649,-0.008735657,-0.018692017,0.027069092,0.017700195,-0.008148193,0.030059814,0.0047721863,0.0231781,-0.011703491,-0.011627197,-0.021713257,-0.021713257,0.0062828064,-0.012512207,-0.06304932,0.005569458,0.006717682,0.059753418,-0.04736328,0.046325684,-0.008354187,-0.0022659302,0.06317139,0.0016307831,-0.046081543,0.0024108887,0.019088745,0.029342651,0.04333496,0.0051078796,-0.03387451,-0.0033435822,0.07836914,-0.018753052,-0.008094788,0.008087158,0.015609741,0.03314209,0.004825592,-0.06304932,-0.039001465,-0.015426636,-0.028182983,0.02305603,-0.031341553,0.028442383,-0.019866943,0.0033226013,-0.011672974,-0.004562378,-0.032318115,0.011161804,-0.019821167,0.012611389,-0.017074585,-0.017349243,0.019485474,0.0063667297,-0.019866943,0.016174316,0.050964355,0.028396606,-0.008972168,-0.039123535,-0.019348145,-0.010185242,0.002986908,0.017608643,0.02670288,0.021591187,0.048980713,-0.036956787,0.030700684,0.032043457,0.012023926,0.035736084,-0.006450653,0.0024108887,-0.06335449,-0.05947876,-0.03152466,-0.04006958,0.029769897,0.0107803345,-0.004463196,0.04663086,0.0010662079,-0.015533447,-0.03692627,0.024612427,-0.04626465,-0.004299164,0.03878784,-0.014450073,-0.047607422,-0.0015363693,0.0018787384,-0.002960205,0.032440186,0.012428284,0.0050086975,0.06774902,0.034057617,-0.0020866394,0.0357666,0.026763916,0.012512207,0.005645752,-0.03894043,-0.019607544,-0.015548706,0.016723633,-0.009552002,-0.019607544,-0.070739746,0.05996704,0.047973633,0.068603516,0.014793396,0.010986328,0.02418518,-0.007701874,0.011131287,-0.02218628,-0.011947632,-0.027862549,-0.052886963,0.025299072,-0.01348114,-0.007865906,-0.01977539,0.03866577,-0.00089645386,0.020721436,-0.043426514,0.058685303,-0.0024795532,-0.010932922,0.027816772,0.0039405823,0.051513672,0.061279297,-0.035736084,0.028320312,0.02670288,-0.038269043,0.0064201355,0.054626465,-0.01763916,-0.0007557869,-0.058807373,-0.015777588,0.00089883804,-0.006828308,-0.05557251,-0.010398865,0.012748718,0.015029907,0.027252197,-0.0025959015,-0.033721924,0.018157959,-0.030029297,-0.061798096,-0.008705139,-0.037963867,0.013626099,0.050842285,-0.026824951,0.0036754608,0.010391235,-0.013763428,-0.00089740753,0.007972717,0.019363403,-0.0039711,-0.055358887,0.031707764,0.0053596497,0.008331299,0.005718231,0.03451538,0.024246216,0.015357971,0.04724121,0.009841919,-0.03137207,-0.062194824,0.024536133,-0.053344727,0.00091457367,0.014663696,-0.021621704,-0.012481689,-0.021987915,-0.023971558,-0.03414917,0.0048217773,-0.018096924,0.009544373,0.017410278,-0.022705078,-0.02760315,-0.048187256,-0.020889282,-0.0039863586,0.07775879,0.029586792,-0.002714157,-0.06628418,-0.012634277,0.020904541,0.015083313,0.0037403107,-0.015045166,-0.014762878,-0.006538391,-0.042053223,-0.009056091,-0.01953125,0.016220093,-0.005130768,-0.012687683,0.03515625,0.0011129379,0.017807007,-0.007835388,0.018737793,0.046173096,-0.03010559,-0.00016462803,-0.035339355,0.018508911,0.0029010773,-0.011856079,-0.055511475,0.036499023,0.012001038,0.027938843,-0.028762817,0.002960205,-0.008460999,0.010353088,0.010261536,-0.0020713806,-0.009223938,-0.0007805824,-0.04815674,-0.061645508,0.033721924,-0.022613525,0.025650024,0.011116028,0.0041542053,0.029083252,0.0005545616,0.0009226799,0.023605347,-0.021728516,-0.01348114,-0.031204224,-0.042022705,-0.0121154785,-0.0057525635,-0.019973755,0.027542114,-0.014953613,0.022857666,-0.0041770935,-0.017654419,0.033050537,-0.0030727386,0.0055160522,0.015625,-0.00058984756,0.018554688,0.045898438,0.008377075,-0.043151855,0.02658081,-0.0021190643,0.009963989,-0.019622803,0.037078857,0.028030396,-0.010192871,-0.008773804,-0.008735657,-0.012962341,-0.016159058,-0.0067367554,0.016555786,0.029083252,0.0013160706,-0.043670654,0.026229858,0.0006375313,-0.030319214,-0.012519836,0.01184082,0.02571106,-0.034118652,0.02607727,0.016204834,0.06665039,-0.019134521,-0.00067281723,0.01965332,0.019241333,0.029159546,0.016937256,-0.016708374,0.018661499,-0.005455017,0.01889038,-0.0129852295,0.00070762634,0.015777588,-0.0019931793,0.01676941,0.027709961,0.012260437,-0.02319336,-0.021209717,0.008453369,-0.013473511,-0.014778137,0.017120361,0.02822876,0.016845703,-0.025741577,0.024108887,0.015960693,-0.033050537,-0.025970459,0.0039138794,0.04876709,-0.019546509,-0.0057868958,0.00818634,0.003288269,0.033325195,-0.05505371,0.001127243,0.01638794,0.0073432922,-0.019058228,-0.03967285,-0.038879395,0.018234253,0.038726807,-0.0010671616,0.019195557,0.04071045,0.010902405,0.004310608,0.022781372,0.006752014,-0.018417358,-0.009857178,-0.03491211,-0.008331299,-0.0049934387,0.00059604645,-0.023254395,0.008483887,-0.016952515,-0.04156494,0.011207581,-0.013450623,-0.006515503,0.00038266182,0.029907227,0.036895752,-0.008598328,0.006801605,-0.014511108,-0.02142334,0.0060691833,-0.007381439,0.01928711,-0.049682617,0.009971619,-0.019439697,-0.009147644,0.0024490356,0.011909485,0.019699097,0.02355957,0.0003683567,0.020523071,-0.043823242,0.035949707,-0.039093018,0.016494751,0.011268616,-0.03982544,-0.010971069,-0.01398468,-0.01878357,0.026412964,-0.01448822,-0.0096206665,-0.021957397,-0.031555176,-0.009056091,-0.054840088,0.025894165,0.035980225,0.036865234,-0.017868042,0.0017366409,-0.0026378632,-0.0040245056,-0.017532349,0.004524231,-0.010345459,0.022399902,0.008132935,0.013969421,-0.029190063,-0.01512146,-0.019683838,0.012809753,-0.04953003,-0.04699707,-0.016143799,0.00730896,-0.014503479,-0.0042381287,-0.03326416,-0.02041626,0.005783081,-0.048858643,0.0131073,0.011550903,0.026535034,0.004634857,-0.009567261,-0.008415222,0.015174866,-0.013641357,0.032196045,-0.0032234192,-0.008666992,-0.031341553,-0.005962372,0.039642334,0.027526855,-0.002374649,-0.004322052,-0.0073165894,-0.008987427,-0.048675537,-0.003282547,-0.007083893,-0.005180359,0.0009627342,0.005821228,-0.04748535,-0.004337311,-0.02067566,-0.004962921,0.026168823,0.013252258,0.022476196,-0.0034046173,-0.001001358,-0.00074863434,-0.01651001,-0.03189087,0.020385742,0.011001587,-0.00042200089,0.019180298,0.04019165,0.001294136,-0.0031337738,-0.0043640137,-0.0019626617,0.01625061,-0.032836914,-0.00031375885,-0.016540527,0.013023376,-0.022628784,-0.0074539185,-0.035949707,-0.002653122,0.095825195,-0.0048828125,-0.004512787,-0.010093689,-0.03366089,0.0154800415,0.026535034,-0.049957275,-0.0020656586,-0.04071045,0.019989014,-0.028427124,0.02268982,0.007648468,0.019256592,-0.035705566,-0.06311035,-0.0074882507,0.0024375916,-0.016189575,-0.059326172,-0.013870239,-0.066589355,-0.009529114,-0.0103302,-0.018539429,0.0027637482,0.00932312,-0.020065308,-0.08081055,0.0019016266,0.047943115,0.0062332153,0.01725769,-0.0211792,0.016342163,0.023284912,-0.026473999,-0.009819031,0.027282715,-0.016403198,-0.012664795,-0.011810303,0.018173218,-0.020507812,-0.012435913,0.026550293,0.0039711,0.017318726,-0.00605011,0.0046806335,-0.011497498,0.010726929,-0.0027942657,0.016052246,-0.00907135,-0.011169434,0.03842163,-0.05340576,0.021453857,0.03552246,-0.004917145,0.0042533875,0.033966064,0.03390503,-0.02998352,-0.028793335,0.024276733,0.003522873,0.035888672,-0.034576416,0.04473877,0.021392822,-0.013801575,0.015464783,-0.0016365051,-0.02154541,-0.037139893,-0.03286743,0.02470398,0.007019043,0.013870239,-0.011154175,-0.0038166046,0.009773254,-0.014701843,0.012832642,-0.013908386,-0.022476196,-0.007171631,-0.0007176399,-0.0010147095,0.0036849976,-0.009689331,0.02796936,0.014564514,0.036895752,-0.003967285,0.002325058,-0.0015335083,0.023086548,-0.017822266,0.012687683,0.017547607,0.010978699,0.022842407,0.008758545,0.003967285,-0.041107178,-0.01083374,-0.023391724,0.003665924,0.0077209473,-0.009536743,-0.0076789856,-0.0030498505,-0.0032596588,-0.0071525574,-0.030456543,0.007080078,-0.03250122,-0.022583008,-0.010231018,-0.013282776,0.014778137,0.0031661987,0.0074424744,0.011550903,-0.0032978058,0.04736328,-0.00032520294,-0.002029419,0.017150879,0.035491943,0.018493652,-0.03265381,-0.006866455,-0.0047073364,0.0030651093,0.0023956299,-0.016052246,0.019836426,0.04083252,-0.0021533966,0.01235199,-0.0066947937,0.031341553,-0.0052375793,0.019348145,-0.013183594,0.018814087,-0.0054130554,0.031982422,-0.049346924,0.021209717,0.025894165,-0.005771637,-0.002904892,-0.022247314,-0.02168274,0.016357422,0.0066070557,-0.019958496,0.05038452,-0.0010051727,0.027709961,-0.022216797,-0.027786255,0.0041160583,-0.03668213,-0.014701843,0.031707764,-0.003396988,0.0034770966,0.021606445,-0.032684326,0.032928467,-0.04043579,0.021026611,-0.0021686554,0.00006133318,-0.0104522705,-0.015319824,-0.026184082,-0.014266968,-0.010391235,0.012336731,0.0046081543,0.046813965,0.01777649,0.035949707,0.059692383,0.014472961,0.005882263,-0.035064697,-0.020324707,-0.01171875,-0.03173828,0.010643005,-0.0056152344,0.054260254,0.03793335,-0.002811432,0.030776978,0.038635254,0.035980225,0.0034770966,0.020324707,-0.0058403015,0.0011672974,-0.003566742,0.025817871,0.00655365,0.03491211,-0.023162842,0.023010254,0.009941101,0.040618896,-0.02760315,0.02822876,0.07171631,0.016448975,-0.0178833,0.035705566,0.0043640137,-0.016784668,-0.013221741,-0.007675171,0.064697266,0.020950317,0.04824829,0.056427002,0.018447876,-0.0015821457,0.014183044,-0.0368042,-0.03024292,0.07141113,0.020812988,-0.028930664,-0.025985718,-0.008132935,0.011482239,-0.04928589,-0.03378296,0.011940002,-0.0056762695,0.008354187,-0.0055656433,-0.007255554,-0.024353027,0.012794495,0.021026611,0.015899658,-0.014022827,0.0154800415,0.031463623,0.0061569214,0.018798828,0.00093603134,0.018814087,-0.03213501,-0.022033691,0.024002075,0.017364502,-0.019180298,-0.007522583,0.026657104,0.008094788,0.046783447,0.033599854,-0.0067825317,0.008132935,0.02217102,0.020828247,-0.0050086975,0.05630493,0.047698975,0.010223389,0.03668213,0.03366089,0.025772095,-0.03768921,0.022872925,-0.0014219284,0.019836426,-0.0023555756,-0.012664795,0.0056533813,-0.010955811,0.010147095,-0.0021324158,-0.02015686,0.024490356,0.026947021,-0.0022563934,-0.007133484,-0.014961243,0.015281677,-0.015296936,-0.0015172958,0.006111145,-0.012527466,0.032806396,0.005935669,0.029373169,-0.030456543,0.02619934,-0.011428833,-0.016860962,-0.0040283203,0.020004272,-0.04360962,0.009086609,-0.0017776489,-0.0031604767,-0.032409668,0.0087509155,0.024414062,-0.004425049,0.022460938,0.016448975,0.0008955002,-0.0017709732,0.022323608,0.009887695,-0.0037021637,-0.01322937,-0.014884949,0.034210205,0.039276123,-0.0023422241,0.012786865,-0.02267456,-0.0043258667,0.00080776215,-0.0077323914,-0.002691269,-0.0060577393,-0.028152466,-0.0287323,0.012817383,0.03942871,0.024383545,0.040649414,-0.013824463,-0.02229309,0.005680084,0.030197144,0.0023784637,0.0023345947,-0.010528564,0.01411438,-0.017074585,0.05215454,0.026260376,0.0075035095,0.026382446,-0.014305115,-0.019836426,0.011947632,-0.020050049,0.03152466,-0.012916565,0.0031089783,-0.01586914,0.025527954,-0.015571594,-0.031585693,0.0071372986,-0.0127334595,-0.019317627,-0.029922485,0.0019683838,0.009552002,0.026824951,0.030700684,0.0146865845,-0.024993896,0.06524658,-0.01335907,0.058258057,-0.0107421875,-0.0019350052,0.047576904,0.034088135,0.036224365,0.023391724,0.0069274902,-0.033935547,0.017211914,0.04272461,0.02911377,-0.00014793873,-0.0013217926,-0.017471313,0.039520264,0.004623413,0.022735596,-0.013031006,-0.002073288,0.008384705,-0.009086609,-0.010719299,0.0038166046,-0.011642456,0.013389587,0.042999268,-0.028152466,-0.013473511,-0.025772095,-0.011642456,0.024475098,-0.000023186207,-0.0023765564,0.0044517517,-0.020095825,0.012588501,-0.035705566,-0.022140503,0.008880615,0.030029297,-0.04373169,-0.02104187,-0.00069379807,0.01309967,-0.019302368,0.032073975,0.02633667,-0.0013542175,0.009017944,0.03729248,-0.0119018555,0.027053833,-0.011039734,0.025482178,0.030166626,-0.0011529922,-0.013999939,0.006958008,0.012939453,-0.012237549,0.014328003,0.039031982,-0.0043144226,0.008651733,0.00044369698,-0.02432251,0.0044898987,-0.004634857,-0.011772156,0.00059461594,-0.007331848,-0.0127334595,0.008804321,0.013626099,0.000088870525,0.00793457,-0.024475098,-0.014633179,-0.0013790131,0.035491943,0.02279663,-0.039398193,0.0000047683716,0.00894928,0.008636475,-0.021957397,-0.015548706,-0.0040626526,-0.031219482,0.0152282715,0.015670776,0.0050811768,0.009407043,-0.015319824,-0.0065612793,0.03213501,0.011054993,0.026275635,0.006000519,-0.0013399124,0.014556885,-0.020080566,-0.005104065,-0.000056385994,-0.012268066,0.002506256,0.01084137,0.006958008,-0.027633667,0.024673462,0.004386902,0.015319824,-0.0040740967,-0.019012451,0.017868042,-0.016448975,-0.0082092285,0.008331299,0.017608643,-0.016601562,-0.01914978,-0.020248413,0.028396606,0.055358887,-0.0016803741,-0.0077400208,0.023605347,0.01713562,0.01676941,0.041290283,0.01828003,0.04876709,0.023864746,-0.022491455,-0.0149002075,0.022964478,-0.011367798,-0.035095215,0.014961243,-0.009162903,-0.0040245056,0.012428284,0.015655518,-0.011672974,-0.024276733,-0.018920898,-0.013214111,-0.019042969,0.021453857,-0.012359619,0.011352539,-0.024475098,-0.0066184998,0.0087890625,-0.01939392,-0.04953003,-0.027572632,-0.0055007935,-0.013572693,-0.044555664,0.0033283234,-0.029159546,0.011207581,-0.01309967,-0.013618469,-0.018875122,0.034973145,-0.021072388,-0.002527237,0.010635376,0.025924683,0.024414062,0.016708374,0.024414062,-0.03945923,-0.02709961,-0.021820068,-0.00083494186,-0.017181396,0.01600647,0.011161804,0.03451538,0.013618469,-0.0032253265,-0.0006093979,-0.005470276,-0.007949829,-0.004085541,-0.024353027,-0.01272583,0.022369385,0.017532349,-0.012435913,-0.014633179,0.03652954,-0.033966064,-0.006263733,0.025802612,0.03994751,0.011894226,0.025558472,-0.019622803,-0.0038833618,-0.018478394,0.0005578995,-0.017486572,0.008270264,0.0046539307,-0.0019950867,-0.010925293,0.0024433136,0.013084412,-0.010261536,-0.015701294,0.029373169,0.002401352,-0.01626587,0.03149414,0.01576233,0.011245728,-0.0019836426,-0.011444092,0.020126343,0.04147339,0.010604858,0.0010232925,0.0010547638,0.0140686035,-0.0060424805,0.011299133,0.021957397,-0.018676758,-0.04559326,-0.02897644,-0.02418518,0.021118164,0.012367249,0.014595032,-0.005092621,0.022842407,-0.029769897,-0.031311035,-0.022125244,0.018997192,-0.00031232834,-0.006095886,-0.0154418945,-0.00016570091,0.02609253,-0.029922485,0.0017776489,-0.030899048,-0.026809692,-0.0057792664,-0.022354126,0.023590088,0.008087158,-0.0046539307,-0.006122589,-0.0049552917,-0.006587982,0.0069351196,0.0368042,-0.010604858,-0.008506775,0.018218994,0.010658264,-0.024627686,0.009567261,-0.0087509155,-0.010345459,0.019332886,-0.016967773,0.018051147,-0.017944336,0.035491943,0.0024909973,-0.00028061867,0.03918457,0.002855301,0.015853882,-0.021072388,0.0076522827,-0.0042495728,-0.006679535,0.03302002,-0.02204895,-0.015914917,0.008964539,-0.018859863,-0.031402588,0.006515503,0.02670288,0.042053223,-0.009849548,0.038116455,-0.02279663,-0.021255493,0.017074585,0.0049095154,-0.024383545,0.0006790161,0.040405273,0.0074424744,-0.010650635,0.0019836426,-0.017471313,-0.0259552,-0.0138168335,0.028045654,-0.0010948181,-0.013534546,0.01423645,0.012168884,0.046875,0.009391785,0.026016235,0.016143799,-0.002111435,0.026260376,0.0018062592,0.0574646,-0.003967285,-0.0413208,0.015548706,-0.0032444,-0.028717041,-0.011642456,-0.0070343018,0.009117126,-0.03616333,0.023147583,-0.0068473816,0.03414917,-0.011741638,0.010902405,-0.03286743,0.0063171387,-0.035888672,-0.012016296,-0.03552246,0.01676941,0.041229248,0.003112793,0.013290405,0.005832672,-0.019638062,0.01890564,0.049346924,-0.010108948,-0.027862549,-0.0024547577,0.016571045,-0.0077590942,0.018692017,0.012870789,-0.012580872,-0.030410767,0.0027694702,-0.02998352,0.0044059753,-0.0038795471,0.0124435425,0.0023651123,0.00242424,0.00016343594,0.02494812,0.0003077984,-0.0007786751,0.0041046143,0.008430481,0.03741455,0.03274536,-0.0126571655,0.025909424,0.016418457,-0.03527832,0.05493164,-0.004638672,0.0335083,-0.027313232,0.0063705444,-0.03250122,-0.026351929,-0.008277893,0.007686615],"createdAt":"2026-04-18T18:45:01.687Z","updatedAt":"2026-04-24T01:32:05.960Z","lastSeenAt":"2026-04-24T01:32:05.960Z","tsv":"'/api':167 '/api/v1/charges/288':101,235 '/docs':165 '/pricing':166 '/readme':169 '/request':13,28 '0.02':12,27,88,131 '000':118 '0x8335':123 '20':117 '2913':124 '6':127 'accept':154 'access':7,22,38,106 'actual':199 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,141,208 'application/json':159 'base':9,24,96,119,126 'base network api' 'broad':48 'call':4,19 'catalog':49 'challeng':112 'classif':64 'commit':149 'connect':175 'content':181 'convers':81 'data':57 'decim':128 'describ':213 'document':160,190,221 'embed':65 'endpoint':32,84,100,153,198 'equal':130 'estim':75 'exact':138 'exampl':193 'exchang':70 'expect':233 'extrem':162 'feed':69 'financ':66 'format':219 'gas':74 'generat':82 'geocod':79 'host':46 'infer':60 'infrastructur':77 'input':215 'json-api' 'key':142 'label':103 'land':204 'limit':145 'list':206 'low payment fee' 'lowpaymentfee.com':34 'made':134 'mani':207 'maxamountrequir':115 'micropayment api' 'network':97 'no-api-key' 'no-rate-limit' 'openapi':185 'output':218 'page':170,205 'paramet':216 'particular':197 'path':209 'pay':2,17,52 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payload':226 'payment':42,132 'per':3,18,53,89 'post':155 'premium':5,20,36,104 'premium api' 'price':68,86 'prompt':177 'protocol':43 'provid':35 'quot':73 'rate':71,144 'render':172 'request':54,90,156 'request/response':188 'requir':151 'respons':231 'return':108,158,200 'schema':189 'scheme':139 'send':228 'sentiment':61 'settl':91 'site':45,202 'span':56 'spars':163 'spec':186 'specif':99,236 'summar':63 'token':72 'unclear':224 'unit':120 'upfront':148 'usdc':15,30,93,122 'usdc api access' 'usdc-base' 'util':78 'valid':80,110 'via':10,25,39,135 'wallet':176 'web3':67 'without':220 'x402':11,26,41,111,137 'x402 api' 'x402-payment'","prices":[{"id":"0abf9ef5-7829-4612-885c-bc2cb28daafa","listingId":"2db0b39a-3446-4c18-abdb-bb82cd5d1ac6","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/288","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:01.687Z"}],"sources":[{"listingId":"2db0b39a-3446-4c18-abdb-bb82cd5d1ac6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/288","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:01.687Z","lastSeenAt":"2026-04-24T01:32:05.960Z"}],"details":{"listingId":"2db0b39a-3446-4c18-abdb-bb82cd5d1ac6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/288 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/288"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-request API services without API key registration","Making micropayments for API calls using USDC on Base","Agent-driven API consumption with x402 payment protocol"],"bestFor":["Developers wanting zero-signup API access with crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go pricing without subscriptions"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate guarantees","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.786Z"},"updatedAt":"2026-04-24T01:32:05.960Z"}}