{"id":"ac2d9f6f-eed7-431a-b1a2-c01aedfa0d89","shortId":"GR8DQV","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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/329` is listed as \"Premium API Access\" and returns a valid x402 challenge with 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 via the x402 exact scheme by including an X-PAYMENT header with a signed payment proof. The endpoint accepts POST requests and returns application/json responses.\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 landing page lists many API paths but does not describe what `/api/v1/payments/329` specifically does beyond the generic \"Premium API Access\" label. Without further documentation, it is unclear what data or functionality this endpoint provides versus the other named endpoints on the platform.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC pay-per-call","Base network API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/329 ('Premium API Access') is completely undocumented; it is unclear what it returns.","No OpenAPI spec or request/response schema is provided.","No examples of successful responses are available.","The endpoint path '/api/v1/payments/329' does not match any of the named API paths listed on the landing page, raising questions about what it actually serves."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/329","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/payments/329","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 accepts payments. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic label. The docs pages are empty (wallet-connect only). It is impossible to determine what this specific endpoint actually does or returns without paying.","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":"2026-04-19T07:08:00.647Z","embedding":[-0.025238037,-0.027328491,0.043914795,0.011672974,0.005847931,-0.027297974,-0.025650024,0.039886475,0.06982422,-0.068237305,0.028503418,-0.044433594,-0.032196045,-0.044036865,-0.021652222,0.0084991455,-0.004020691,0.003610611,-0.035095215,0.032318115,0.029800415,-0.020599365,-0.031097412,0.03945923,-0.004333496,-0.026428223,-0.013191223,-0.008010864,-0.01398468,-0.03829956,0.037719727,-0.026748657,-0.0047912598,0.010246277,-0.017501831,-0.022003174,-0.007572174,0.03765869,0.030944824,-0.012008667,0.0036716461,-0.052825928,-0.0036754608,-0.007396698,-0.057525635,-0.0027770996,0.0062675476,-0.025024414,-0.012184143,0.010215759,-0.038482666,-0.015510559,0.0016336441,-0.0057296753,0.00819397,0.00894165,-0.008964539,-0.014961243,0.008781433,0.010620117,-0.0076446533,-0.059020996,-0.020523071,-0.016662598,0.0072021484,0.053833008,-0.012161255,0.04937744,0.009094238,0.054595947,0.050689697,0.05090332,0.03326416,0.019180298,0.007019043,-0.0026569366,0.0032596588,0.061309814,-0.018814087,-0.013366699,-0.0140686035,-0.008651733,-0.049072266,0.00051116943,-0.02267456,-0.041107178,-0.015930176,0.013870239,-0.023880005,0.02130127,-0.067993164,0.0009174347,-0.014808655,0.010414124,0.00003886223,-0.0018558502,-0.024307251,0.028701782,-0.021713257,0.0155181885,0.0056419373,-0.044311523,0.022109985,0.004951477,0.049224854,0.0519104,0.023742676,0.028579712,0.0095825195,-0.022521973,-0.023254395,0.016540527,0.002128601,-0.005207062,0.007209778,0.021469116,-0.023483276,0.015327454,-0.021774292,0.014289856,-0.052124023,0.047821045,0.022827148,-0.018463135,0.015556335,-0.048095703,-0.0012245178,0.017669678,-0.027816772,-0.0038776398,0.028701782,0.011413574,0.030853271,-0.02545166,-0.032196045,0.009422302,-0.018707275,-0.012962341,-0.039093018,-0.031143188,0.028030396,-0.03338623,0.027069092,0.030883789,-0.08929443,-0.024169922,-0.03692627,0.0046577454,-0.036224365,-0.003791809,-0.013053894,0.018508911,-0.014350891,-0.009300232,-0.03250122,-0.024795532,0.0039138794,0.03475952,-0.024307251,0.051330566,-0.003929138,0.0149383545,0.01940918,0.013252258,0.03289795,0.035186768,-0.0038871765,-0.0690918,-0.08154297,-0.021713257,-0.005794525,-0.021850586,-0.037261963,-0.0021781921,0.0049858093,-0.06222534,-0.01108551,-0.008277893,0.0035591125,-0.039031982,-0.008834839,-0.026748657,0.012641907,0.0034542084,-0.06304932,-0.02684021,-0.030853271,0.072509766,0.026855469,0.007369995,0.040893555,-0.0078125,0.054901123,0.0077667236,-0.031463623,-0.028244019,0.020980835,-0.016830444,0.014328003,0.0028305054,-0.0026493073,-0.034454346,0.034088135,0.06567383,0.0181427,-0.017074585,-0.0034389496,-0.05871582,-0.046051025,-0.046813965,0.004470825,-0.0019111633,0.007865906,0.038146973,-0.022903442,-0.023239136,0.0034675598,0.011161804,0.019042969,0.06390381,0.019638062,0.0015935898,0.014717102,0.017532349,-0.033843994,0.032226562,0.038330078,0.014640808,-0.02571106,-0.03289795,0.023513794,0.037719727,-0.023544312,0.016952515,-0.020904541,0.031707764,0.0027446747,0.021057129,0.026000977,-0.019714355,-0.013702393,-0.023773193,-0.011741638,0.03250122,0.01071167,-0.034240723,-0.03930664,-0.07556152,0.0463562,0.03842163,0.05819702,-0.002155304,0.002040863,-0.027511597,-0.024169922,-0.07940674,0.050689697,0.08886719,-0.015609741,-0.0074424744,0.009643555,-0.0007724762,-0.03237915,-0.0030059814,-0.008972168,-0.02758789,-0.026443481,0.0073242188,-0.04058838,0.0118255615,0.01525116,0.03363037,0.05859375,-0.0014543533,-0.057617188,-0.027633667,0.0053749084,0.0006465912,-0.025543213,-0.00072050095,-0.009498596,0.018035889,0.025100708,0.0048561096,0.025939941,-0.0017843246,0.014427185,-0.009506226,-0.013908386,-0.022903442,-0.028915405,0.008476257,-0.005695343,-0.07006836,0.016799927,0.0042381287,0.06530762,-0.05319214,0.041137695,-0.005092621,-0.0036506653,0.058807373,-0.0053253174,-0.042388916,0.011070251,0.020233154,0.020019531,0.046905518,-0.005138397,-0.034423828,-0.005771637,0.0703125,-0.022705078,-0.011749268,0.00970459,0.017578125,0.035980225,-0.0012083054,-0.060058594,-0.033966064,-0.019241333,-0.028030396,0.019165039,-0.0234375,0.020629883,-0.014442444,-0.001698494,-0.01864624,-0.019332886,-0.02911377,0.015533447,-0.018463135,0.0069732666,-0.017990112,-0.026504517,0.03387451,0.02067566,-0.007144928,0.017730713,0.052886963,0.019042969,-0.01197052,-0.03186035,-0.015220642,-0.016983032,0.0020332336,0.022964478,0.022857666,0.020309448,0.062347412,-0.04220581,0.022872925,0.030807495,0.022781372,0.029769897,-0.00081157684,0.008888245,-0.06604004,-0.060577393,-0.027328491,-0.042022705,0.025497437,-0.0010442734,-0.010314941,0.056793213,0.01197052,-0.019302368,-0.043670654,0.02470398,-0.042877197,-0.008430481,0.037750244,-0.01878357,-0.032562256,-0.0014104843,0.0011968613,-0.00045871735,0.034851074,0.008972168,0.009498596,0.06088257,0.048950195,0.0061416626,0.032165527,0.020553589,0.018585205,0.0043907166,-0.033935547,-0.017608643,-0.008430481,0.018814087,-0.016326904,-0.018066406,-0.07513428,0.055847168,0.047943115,0.074523926,0.018844604,0.011161804,0.02859497,-0.010925293,0.010314941,-0.028076172,-0.01309967,-0.03164673,-0.04711914,0.03274536,-0.018417358,-0.013648987,-0.013458252,0.0284729,0.004737854,0.02166748,-0.03414917,0.054382324,0.0033340454,-0.0044403076,0.028366089,0.0031719208,0.04272461,0.05480957,-0.037902832,0.03656006,0.021392822,-0.033050537,0.0138168335,0.04034424,-0.022857666,-0.010292053,-0.050231934,-0.023773193,0.0005378723,-0.0061302185,-0.054748535,-0.0053749084,0.0093307495,0.022918701,0.038757324,-0.020568848,-0.029251099,0.014167786,-0.020736694,-0.057037354,-0.011558533,-0.0284729,0.007865906,0.047302246,-0.025177002,0.0010232925,0.01309967,-0.0057792664,0.0059051514,0.0044021606,0.017059326,-0.00038075447,-0.044158936,0.015258789,0.009140015,0.01184845,0.0025482178,0.0317688,0.013885498,0.021560669,0.052246094,0.011619568,-0.028289795,-0.062072754,0.021621704,-0.05819702,0.0013103485,0.012168884,-0.02229309,-0.011268616,-0.0138549805,-0.022155762,-0.038208008,-0.010101318,-0.017959595,0.013389587,0.025787354,-0.03640747,-0.02406311,-0.046295166,-0.020568848,0.001036644,0.07299805,0.025177002,0.003917694,-0.060150146,-0.012893677,0.018630981,0.006336212,0.007896423,-0.014442444,-0.01285553,-0.0079422,-0.029327393,-0.01576233,-0.020568848,0.022125244,-0.0047302246,-0.010848999,0.037963867,0.005794525,0.019485474,-0.006263733,0.01914978,0.032043457,-0.030700684,0.010505676,-0.0234375,0.029541016,0.007507324,-0.014442444,-0.050994873,0.047576904,0.012588501,0.027740479,-0.029037476,-0.0031986237,0.00048971176,0.00995636,0.020492554,-0.0023994446,-0.009986877,-0.00025248528,-0.048431396,-0.053619385,0.041107178,-0.019104004,0.025497437,0.016983032,0.0061187744,0.01940918,0.0032215118,-0.005554199,0.021118164,-0.026489258,-0.013626099,-0.031585693,-0.03579712,-0.014976501,-0.005458832,-0.017822266,0.021438599,-0.022644043,0.015144348,0.012458801,-0.021072388,0.033325195,-0.002128601,0.0065345764,0.015029907,-0.0012769699,0.012229919,0.039093018,-0.0033550262,-0.037322998,0.02192688,-0.0005097389,0.009986877,-0.012954712,0.041778564,0.03427124,-0.011489868,0.0016784668,-0.005519867,-0.018463135,-0.01965332,-0.0057792664,0.006603241,0.025131226,0.0010147095,-0.04623413,0.026367188,0.0024337769,-0.019638062,-0.027374268,0.013793945,0.01651001,-0.03656006,0.02230835,0.019851685,0.062805176,-0.01939392,-0.0026130676,0.022827148,0.01965332,0.03756714,0.016189575,-0.01979065,0.019577026,-0.009986877,0.01826477,-0.003490448,-0.010314941,0.010475159,0.0021343231,0.028579712,0.029815674,0.009941101,-0.028518677,-0.021255493,-0.003484726,-0.01423645,-0.016174316,0.019683838,0.03173828,0.026062012,-0.022354126,0.018676758,0.014274597,-0.027893066,-0.025650024,-0.012008667,0.03491211,-0.026260376,-0.011764526,0.012519836,0.0052757263,0.037261963,-0.059692383,0.0023021698,0.0051498413,0.01574707,-0.023117065,-0.03729248,-0.041290283,0.018615723,0.03656006,0.00894165,0.023361206,0.03970337,0.003019333,-0.0029010773,0.021621704,0.0071640015,-0.011520386,-0.012252808,-0.04144287,-0.016281128,-0.0001333952,-0.0022964478,-0.025009155,0.009292603,-0.011375427,-0.036193848,0.0069618225,-0.011482239,-0.0073127747,-0.011154175,0.022338867,0.04711914,-0.004878998,0.011169434,-0.019943237,-0.02532959,0.0027008057,0.004096985,0.019851685,-0.059631348,0.018875122,-0.018066406,-0.0038089752,-0.0025577545,0.00541687,0.028060913,0.022598267,0.007835388,0.019454956,-0.048858643,0.030334473,-0.027359009,0.01586914,0.00762558,-0.033966064,-0.0069732666,-0.021209717,-0.018722534,0.028182983,-0.014350891,-0.013374329,-0.028884888,-0.037750244,-0.018615723,-0.05911255,0.02470398,0.03753662,0.035614014,-0.031173706,0.008842468,-0.007873535,-0.0012750626,-0.019989014,0.0026626587,-0.0045204163,0.019180298,0.009376526,0.0035972595,-0.04537964,-0.01940918,-0.016647339,0.0044136047,-0.045776367,-0.04827881,-0.013572693,0.009643555,-0.010192871,-0.0068511963,-0.034606934,-0.0259552,-0.004650116,-0.050872803,0.011108398,0.011436462,0.023254395,0.0101623535,-0.018051147,-0.00046563148,0.023590088,-0.0066947937,0.035247803,0.0075263977,-0.01348114,-0.03152466,-0.0022068024,0.026657104,0.028182983,0.004272461,-0.005420685,-0.0098724365,-0.016464233,-0.051574707,-0.014793396,-0.006793976,-0.011619568,-0.008583069,0.0069351196,-0.043670654,0.003545761,-0.017440796,-0.005558014,0.029769897,0.01197052,0.015792847,-0.0079574585,-0.0010328293,-0.010322571,-0.013717651,-0.03692627,0.025115967,0.010414124,0.002281189,0.02319336,0.04043579,0.008399963,-0.013267517,0.0052223206,-0.00092458725,0.016921997,-0.021606445,0.008079529,-0.010223389,0.0035877228,-0.017791748,-0.013511658,-0.03488159,-0.0030841827,0.09265137,-0.01184845,-0.007904053,-0.010169983,-0.019851685,0.019515991,0.03225708,-0.045318604,-0.000767231,-0.034301758,0.020217896,-0.02571106,0.024475098,0.0118637085,0.02230835,-0.023651123,-0.057617188,-0.006362915,-0.004901886,-0.019882202,-0.066223145,-0.020263672,-0.06573486,-0.011352539,-0.0076828003,-0.022735596,0.0021972656,0.021072388,-0.019332886,-0.08856201,0.0019416809,0.044555664,0.013885498,0.020996094,-0.007987976,0.02520752,0.022018433,-0.029556274,-0.016815186,0.03326416,-0.03036499,-0.012901306,-0.015609741,0.015350342,-0.02557373,-0.020004272,0.024230957,0.010978699,0.013664246,-0.013641357,-0.001909256,-0.020599365,0.010856628,-0.011497498,0.023086548,-0.00071907043,-0.017807007,0.040252686,-0.0446167,0.02053833,0.019729614,-0.0079956055,0.0027103424,0.03274536,0.037719727,-0.030288696,-0.014457703,0.0259552,0.0154800415,0.03274536,-0.022735596,0.037475586,0.008026123,-0.017532349,0.011238098,-0.0041770935,-0.022994995,-0.039001465,-0.0236969,0.0211792,-0.0030555725,0.017501831,-0.013626099,0.0030956268,0.004890442,-0.003238678,0.0138168335,-0.01109314,-0.028289795,-0.013069153,-0.006916046,0.0030670166,0.012870789,-0.010124207,0.027023315,0.0234375,0.035003662,0.0066184998,-0.0029830933,0.005584717,0.025787354,-0.015052795,0.0035419464,0.013069153,-0.000910759,0.0126571655,0.019805908,-0.00008392334,-0.047210693,-0.009590149,-0.028518677,-0.00013124943,0.003627777,-0.005027771,-0.017150879,-0.005596161,-0.0028209686,-0.0034217834,-0.031280518,0.011932373,-0.027664185,-0.025756836,-0.012191772,-0.017684937,0.018737793,0.011047363,0.008666992,0.020019531,0.00041532516,0.047210693,0.0052604675,-0.011054993,0.023254395,0.029846191,0.011886597,-0.034118652,-0.01083374,-0.005630493,-0.00038528442,-0.0039711,-0.026168823,0.019546509,0.030761719,-0.010803223,0.0107421875,-0.0008330345,0.02909851,-0.006504059,0.008544922,-0.00504303,0.018493652,-0.014701843,0.03744507,-0.046905518,0.010124207,0.023010254,-0.00093984604,0.0023708344,-0.010856628,-0.028762817,0.015510559,0.0037727356,-0.018432617,0.050354004,0.0059013367,0.034729004,-0.024841309,-0.012290955,0.0015993118,-0.03326416,-0.012886047,0.029251099,0.00466156,0.002714157,0.018203735,-0.031707764,0.031402588,-0.038085938,0.025665283,-0.003435135,0.0027179718,-0.010734558,-0.023345947,-0.023712158,-0.015823364,-0.013366699,0.003824234,0.0034999847,0.045440674,0.017456055,0.030334473,0.05105591,0.0070343018,0.0065612793,-0.036346436,-0.030029297,0.00014317036,-0.028137207,0.008049011,-0.011451721,0.05996704,0.045684814,-0.0021858215,0.03768921,0.032226562,0.03479004,-0.0043563843,0.013648987,-0.0066566467,0.007259369,-0.009498596,0.022567749,0.008460999,0.039276123,-0.029510498,0.026351929,0.010276794,0.036621094,-0.028442383,0.036102295,0.06451416,0.022216797,-0.014457703,0.035736084,0.0032367706,-0.014419556,-0.016281128,-0.011108398,0.062286377,0.00919342,0.056365967,0.05593872,0.017669678,-0.00016760826,0.02027893,-0.031585693,-0.029922485,0.068115234,0.021743774,-0.028320312,-0.024978638,-0.00818634,0.0070533752,-0.052368164,-0.03274536,0.01007843,-0.008674622,0.009254456,-0.0022792816,-0.0018720627,-0.011703491,0.0040626526,0.026748657,0.017669678,-0.017196655,0.016052246,0.024337769,0.0095825195,0.019973755,-0.0040740967,0.029556274,-0.035858154,-0.02268982,0.019821167,0.01638794,-0.017410278,0.0013999939,0.026412964,-0.0013465881,0.04800415,0.042419434,-0.015403748,0.011978149,0.03564453,0.013687134,0.0025539398,0.06262207,0.031311035,0.022094727,0.04046631,0.035858154,0.017944336,-0.041229248,0.026153564,-0.0046463013,0.007774353,-0.016098022,-0.01737976,0.004371643,-0.008720398,0.02229309,-0.0023536682,-0.019363403,0.02633667,0.027282715,0.0057907104,-0.0022792816,-0.011795044,0.015472412,-0.01979065,-0.0008621216,0.013427734,-0.0026340485,0.03918457,0.0054969788,0.028656006,-0.026550293,0.030136108,-0.0066223145,-0.018722534,-0.0033988953,0.028182983,-0.0362854,0.008918762,-0.0054473877,-0.0032615662,-0.047576904,0.009613037,0.029922485,-0.00894928,0.02859497,0.01398468,-0.0014600754,-0.0010070801,0.02444458,0.011177063,-0.0020484924,-0.011741638,-0.019180298,0.034118652,0.043029785,-0.003522873,0.016723633,-0.016296387,-0.006252289,0.004634857,-0.01109314,-0.00491333,-0.010826111,-0.017150879,-0.039215088,0.009376526,0.039215088,0.016235352,0.046936035,-0.013069153,-0.017318726,0.011871338,0.030288696,0.012786865,0.0006375313,-0.012245178,0.018630981,-0.026382446,0.051757812,0.02999878,0.009292603,0.03237915,-0.013137817,-0.018371582,0.015182495,-0.01689148,0.02658081,-0.014167786,0.005619049,-0.010314941,0.022964478,-0.021560669,-0.044708252,0.014289856,-0.016815186,-0.009757996,-0.029663086,0.0077590942,0.009346008,0.029281616,0.033081055,0.009140015,-0.030838013,0.06549072,-0.016189575,0.05340576,-0.013313293,-0.0038642883,0.04748535,0.0357666,0.04095459,0.013549805,0.020843506,-0.034118652,0.026168823,0.03881836,0.024749756,0.0016450882,-0.007820129,-0.01600647,0.042999268,0.0033740997,0.025024414,-0.0184021,-0.0015630722,0.01828003,0.0013523102,-0.008956909,-0.004463196,-0.0073242188,0.010269165,0.038085938,-0.03640747,-0.01576233,-0.019607544,-0.017868042,0.027664185,-0.009315491,-0.00017309189,0.01486969,-0.02684021,0.014442444,-0.034698486,-0.016113281,-0.0010566711,0.027145386,-0.03265381,-0.015808105,0.00333786,0.009117126,-0.021438599,0.035980225,0.024597168,0.00009703636,0.012817383,0.040771484,-0.0090408325,0.033081055,-0.016784668,0.02494812,0.033172607,-0.0036334991,-0.0072746277,0.008407593,0.015602112,-0.013908386,0.012069702,0.039978027,-0.010765076,0.008361816,0.0050468445,-0.013946533,0.010887146,0.0021457672,-0.002544403,-0.0039749146,-0.010314941,-0.015014648,0.004047394,0.015129089,-0.0031719208,0.016738892,-0.022567749,-0.015388489,0.003435135,0.04437256,0.016799927,-0.038238525,0.004119873,0.0044288635,0.012908936,-0.021408081,-0.009819031,-0.0008096695,-0.026382446,0.015167236,0.017944336,0.008155823,0.010391235,-0.025665283,-0.0023269653,0.02519226,0.01890564,0.024963379,0.004184723,0.005367279,0.012207031,-0.022567749,0.00024306774,-0.004108429,-0.008712769,0.008308411,0.014144897,-0.000916481,-0.028076172,0.027359009,-0.00053215027,0.0054473877,-0.0011882782,-0.014419556,0.015930176,-0.013771057,-0.013336182,-0.00041651726,0.0146484375,-0.009002686,-0.0181427,-0.018966675,0.03149414,0.050811768,-0.008140564,-0.014205933,0.019119263,0.0069885254,0.022506714,0.037200928,0.0107421875,0.04373169,0.022994995,-0.026138306,-0.017456055,0.014511108,-0.01576233,-0.029815674,0.008872986,-0.013938904,-0.013755798,0.009727478,0.007972717,-0.010475159,-0.025054932,-0.017501831,-0.01235199,-0.028076172,0.020385742,-0.016479492,0.0095825195,-0.028915405,-0.013214111,0.0067863464,-0.021255493,-0.03955078,-0.028671265,-0.0047836304,-0.01828003,-0.048309326,0.0088272095,-0.024658203,0.013702393,-0.017242432,0.0010700226,-0.010322571,0.034820557,-0.02178955,-0.011108398,0.011306763,0.026412964,0.016647339,0.012290955,0.028244019,-0.040008545,-0.035614014,-0.022033691,0.0034942627,-0.018112183,0.023529053,-0.00491333,0.034332275,0.015090942,-0.0063667297,-0.0013942719,-0.0074806213,-0.0038146973,-0.0024719238,-0.02508545,-0.011955261,0.016799927,0.012435913,-0.004436493,-0.0061416626,0.039398193,-0.029067993,-0.008880615,0.0289917,0.04019165,0.008529663,0.03387451,-0.016281128,-0.008041382,-0.019424438,-0.0023345947,-0.012969971,0.014038086,0.0013999939,0.006587982,-0.015129089,0.0035419464,0.019683838,-0.0072402954,-0.0051002502,0.027709961,-0.0011978149,-0.008834839,0.03164673,0.008926392,0.0041656494,-0.002046585,-0.012435913,0.013313293,0.03866577,0.01071167,0.004688263,-0.0085372925,0.015159607,-0.014221191,0.008834839,0.018844604,-0.013084412,-0.035858154,-0.011985779,-0.03643799,0.021957397,0.0028457642,0.015419006,-0.0061531067,0.01789856,-0.018920898,-0.03488159,-0.023345947,0.022979736,0.0053215027,-0.005958557,-0.006511688,-0.0012636185,0.019485474,-0.028656006,0.0000039339066,-0.043518066,-0.040893555,-0.0099487305,-0.02658081,0.026321411,0.011924744,-0.0068206787,-0.00034165382,-0.01197052,0.00076007843,0.0056533813,0.028366089,-0.010696411,-0.009712219,0.024536133,0.0098724365,-0.027770996,0.00969696,-0.008399963,-0.0043678284,0.025817871,-0.012748718,0.013793945,-0.012306213,0.0289917,0.0069503784,-0.0093307495,0.034210205,0.014732361,0.014518738,-0.031951904,0.011520386,0.00079870224,-0.009254456,0.030654907,-0.027297974,-0.012023926,0.0031433105,-0.02255249,-0.03250122,0.004348755,0.021270752,0.036895752,-0.021255493,0.028808594,-0.013847351,-0.020950317,0.014945984,0.011329651,-0.023529053,-0.0029754639,0.038238525,0.007472992,-0.008384705,-0.003419876,-0.013153076,-0.026306152,-0.014732361,0.019378662,0.0006594658,-0.01637268,0.0154418945,0.014404297,0.04168701,0.004940033,0.020904541,0.014549255,0.0012836456,0.024749756,0.009422302,0.05404663,-0.00340271,-0.039001465,0.01348114,-0.0068244934,-0.026809692,-0.011924744,-0.004863739,0.006000519,-0.043884277,0.01966858,0.0013656616,0.029251099,-0.017166138,0.019882202,-0.022003174,-0.000049233437,-0.034576416,-0.016525269,-0.025680542,0.019683838,0.03567505,-0.0016117096,0.013885498,0.006614685,-0.027328491,0.019577026,0.050323486,-0.01133728,-0.03164673,-0.009132385,0.006542206,-0.002363205,0.014945984,0.010231018,-0.017410278,-0.032043457,-0.00009530783,-0.030654907,0.0049591064,-0.007369995,0.0129470825,0.0046844482,-0.0063285828,0.0027008057,0.023269653,-0.00069236755,0.0012083054,0.0062294006,0.0069503784,0.031433105,0.040496826,-0.01449585,0.03036499,0.0289917,-0.04046631,0.048980713,-0.005268097,0.027297974,-0.01890564,0.002872467,-0.03253174,-0.018814087,-0.0099487305,-0.0012693405],"createdAt":"2026-04-18T18:50:24.729Z","updatedAt":"2026-04-23T12:31:28.553Z","lastSeenAt":"2026-04-23T12:31:28.553Z","tsv":"'/api':183 '/api/v1/payments/329':112,229 '/docs':181 '/pricing':182 '/readme':185 '/request':13,28 '0.02':12,27,88,141 '000':130 '0x8335':135 '20':129 '2913':136 '6':145 'Base network API' 'USDC pay-per-call' 'accept':169 'access':7,22,38,118,237 'actual':215 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,117,222,236 'application/json':174 'base':9,24,96,131,138 'beyond':232 'broad':48 'call':4,19 'catalog':49 'challeng':124 'classif':64 'commit':107 'connect':191 'content':197 'convers':81 'data':57,246 'decim':146 'describ':227 'document':176,206,241 'embed':65 'endpoint':32,84,111,168,214,250,256 'equal':140 'estim':75 'exact':153 'exampl':209 'exchang':70 'extrem':178 'feed':69 'financ':66 'function':248 'gas':74 'generat':82 'generic':234 'geocod':79 'given':142 'header':161 'host':46 'includ':156 'infer':60 'infrastructur':77 'json-response' 'key':101 'label':238 'land':218 'limit':104 'list':114,220 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':149 'mani':221 'maxamountrequir':127 'micropayment API' 'name':255 'network':97 'no-api-key' 'openapi':201 'page':186,219 'particular':213 'path':223 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-request':51 'payabl':91 'payment':42,147,160,165 'per':3,18,53,89 'platform':259 'post':170 'post-method' 'premium':5,20,36,116,235 'price':68,86 'prompt':193 'proof':166 'protocol':43 'provid':35,251 'quot':73 'rate':71,103 'render':188 'request':54,90,171 'request/response':204 'requir':108 'respons':175 'return':120,173,216 'schema':205 'scheme':154 'sentiment':61 'sign':164 'site':45 'span':56 'spars':179 'spec':202 'specif':110,230 'summar':63 'token':72 'unclear':244 'unit':132 'usdc':15,30,93,134,143 'usdc-base' 'util':78 'valid':80,122 'versus':252 'via':10,25,39,150 'wallet':192 'web3':67 'without':239 'x':159 'x-payment':158 'x402':11,26,41,123,152 'x402 premium API' 'x402-payment'","prices":[{"id":"0e894f76-101d-456d-8883-0d808db26901","listingId":"ac2d9f6f-eed7-431a-b1a2-c01aedfa0d89","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/payments/329","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:24.729Z"}],"sources":[{"listingId":"ac2d9f6f-eed7-431a-b1a2-c01aedfa0d89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/329","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:24.729Z","lastSeenAt":"2026-04-23T12:31:28.553Z"}],"details":{"listingId":"ac2d9f6f-eed7-431a-b1a2-c01aedfa0d89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/329 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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/payments/329"}],"useCases":["Programmatic access to paid API services without traditional API key registration","Agent-driven pay-per-call workflows using x402 on Base","Accessing premium data or services with USDC micropayments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible wallet or USDC balance","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.265Z"},"updatedAt":"2026-04-23T12:31:28.553Z"}}