{"id":"1f4a8224-7c23-4f85-bfa7-a120d9848d02","shortId":"NBSurw","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com is part of a broader suite of x402-protocol pay-per-request APIs hosted on the Base network. The specific resource `/api/v1/cards/98` is listed under \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nThe provider's landing page advertises a wide catalog of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. However, the specific functionality behind `/api/v1/cards/98` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause the endpoint's actual input parameters and response format are unknown, agents should treat this as a stub listing until the provider publishes documentation or an output schema. The x402 challenge is live and well-formed, confirming the endpoint is operational and ready to accept payments.","tags":[],"capabilities":["x402-payment-gated","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","402 payment required"],"warnings":["The specific functionality of /api/v1/cards/98 is undocumented — the label 'Premium API Access' provides no detail on what data or service is returned.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no substantive content.","The broader site lists many endpoint categories (AI, finance, analytics, etc.) but none map clearly to the /cards/98 path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/98","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/cards/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/cards/98 is entirely undescribed beyond a generic 'Premium API Access' label. Docs pages render only 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":"2026-04-19T03:03:18.440Z","embedding":[-0.020965576,-0.024612427,0.041534424,0.016998291,0.014450073,-0.04147339,-0.025024414,0.039520264,0.077697754,-0.0647583,0.04864502,-0.062072754,-0.049804688,-0.027542114,-0.028411865,-0.00019454956,-0.006088257,0.00014054775,-0.038482666,0.030899048,0.03326416,-0.015914917,-0.018432617,0.040283203,0.011894226,-0.0058288574,-0.004261017,-0.005592346,0.008598328,-0.044555664,0.025054932,-0.025772095,0.0005917549,0.014770508,-0.0138549805,-0.010482788,0.001367569,0.051330566,0.027664185,-0.016815186,0.013938904,-0.058441162,0.011039734,-0.0077934265,-0.05178833,0.0047683716,0.014503479,-0.041015625,-0.009857178,0.0077705383,-0.037475586,0.0072669983,-0.013320923,0.014816284,0.012252808,0.0034770966,-0.027770996,-0.02684021,0.01576233,0.019821167,-0.013343811,-0.06323242,-0.004673004,0.00033211708,0.0015907288,0.034606934,-0.03062439,0.049072266,0.0113220215,0.07098389,0.044311523,0.043518066,0.01979065,0.007472992,-0.0048599243,-0.007522583,-0.0074272156,0.059143066,-0.01876831,-0.026229858,-0.028961182,-0.008102417,-0.051971436,-0.03012085,-0.034057617,-0.06124878,0.0008945465,0.007522583,-0.017822266,0.028579712,-0.08337402,-0.0035114288,-0.03161621,0.0070343018,-0.013366699,0.008033752,-0.022537231,0.01763916,-0.00047016144,0.013763428,0.020828247,-0.03942871,0.022781372,0.024520874,0.054992676,0.033477783,0.008239746,0.048217773,-0.008956909,-0.036315918,-0.028335571,0.0039253235,-0.029083252,-0.0030460358,0.009468079,0.018859863,-0.0062828064,0.008415222,-0.02659607,0.01725769,-0.05444336,0.042297363,0.017974854,-0.029190063,0.019470215,-0.031951904,-0.00687027,-0.002658844,-0.018234253,-0.0039711,0.009902954,-0.0048828125,0.03540039,-0.017913818,-0.035583496,0.0009899139,-0.020736694,-0.03677368,-0.06488037,-0.026565552,0.032928467,-0.015533447,0.024810791,0.03289795,-0.09057617,-0.012031555,-0.050811768,0.0056495667,-0.04852295,0.0061798096,-0.0054512024,0.03201294,-0.009933472,-0.015586853,-0.010192871,-0.04119873,-0.018508911,0.02470398,-0.006954193,0.040863037,0.006465912,0.025100708,0.018157959,-0.0007266998,0.02053833,0.019134521,-0.0022830963,-0.06536865,-0.08154297,-0.018173218,-0.0007362366,-0.021087646,-0.053741455,0.0067100525,-0.018493652,-0.06842041,-0.03250122,-0.013389587,-0.01197052,-0.04269409,-0.01763916,-0.023635864,0.0037975311,-0.014221191,-0.072509766,-0.010520935,-0.032287598,0.060333252,0.032226562,-0.0023479462,0.02746582,-0.0102005005,0.060028076,0.0051612854,-0.012901306,-0.049468994,0.037719727,-0.02973938,0.026870728,0.010353088,0.0037269592,-0.040496826,0.029144287,0.062561035,0.007881165,-0.029388428,-0.0027866364,-0.040893555,-0.03161621,-0.014678955,0.013717651,0.006500244,-0.0050621033,0.025360107,-0.026550293,-0.030273438,0.007434845,0.00541687,0.023086548,0.06323242,0.00038409233,-0.001036644,0.008216858,0.0073928833,-0.04345703,0.04333496,0.032409668,0.038085938,-0.0287323,-0.024490356,0.013893127,0.051605225,-0.019424438,-0.012687683,-0.020812988,0.023529053,0.0044784546,0.013839722,0.03604126,-0.016647339,-0.019165039,-0.031585693,-0.008224487,0.012031555,0.0039482117,-0.034332275,-0.047821045,-0.077697754,0.042053223,0.047821045,0.03253174,-0.013145447,0.0005645752,-0.0234375,-0.01033783,-0.05532837,0.037475586,0.06213379,-0.028381348,-0.027709961,0.029922485,-0.019577026,-0.030197144,-0.0105896,-0.020126343,-0.029571533,-0.039031982,0.015914917,-0.031036377,0.007205963,0.016738892,0.03842163,0.048034668,-0.010177612,-0.049865723,-0.039215088,-0.01309967,0.005607605,-0.023239136,0.0005226135,0.0026283264,0.012817383,0.035980225,0.008232117,0.021881104,-0.008003235,0.016693115,-0.0076789856,0.0026779175,-0.02180481,-0.030899048,0.013076782,-0.0036640167,-0.07281494,0.0059318542,-0.01600647,0.054840088,-0.03640747,0.043670654,-0.017349243,0.0048599243,0.051879883,-0.017654419,-0.026123047,-0.005138397,0.022232056,0.064331055,0.044067383,0.0023212433,-0.011497498,-0.016586304,0.064819336,-0.011154175,0.0017271042,0.011108398,0.021865845,0.016693115,0.004875183,-0.047912598,-0.041259766,-0.009605408,-0.009361267,0.039916992,-0.03274536,0.039764404,-0.011413574,0.004699707,-0.03164673,0.005428314,-0.036621094,0.012763977,-0.018615723,-0.0012397766,-0.0096588135,-0.010292053,0.0146102905,0.0034675598,-0.025421143,-0.010612488,0.042877197,0.017364502,-0.0022335052,-0.023986816,-0.017456055,-0.029006958,0.0068893433,0.024505615,0.024246216,0.028686523,0.019714355,-0.041412354,0.026321411,0.024398804,0.028121948,0.023254395,-0.00919342,0.015640259,-0.042541504,-0.040252686,-0.01071167,-0.034729004,0.026519775,0.002046585,0.0064888,0.04824829,0.022155762,-0.02230835,-0.031188965,0.021606445,-0.05001831,-0.0074157715,0.03289795,-0.011306763,-0.043395996,0.0010547638,-0.013656616,0.008666992,0.04663086,0.00983429,-0.003200531,0.07519531,0.034301758,0.019073486,0.0129852295,0.018508911,0.030792236,0.010185242,-0.026306152,-0.025405884,-0.0154800415,0.019989014,-0.018859863,-0.037963867,-0.07757568,0.04776001,0.029190063,0.07373047,0.014709473,0.00982666,0.051574707,-0.018875122,0.015045166,-0.021881104,-0.022079468,-0.021560669,-0.031036377,0.044555664,-0.0084991455,-0.014259338,-0.03189087,0.035003662,0.00026273727,0.018875122,-0.024337769,0.060333252,0.007446289,-0.01360321,0.01272583,0.0022525787,0.053771973,0.06390381,-0.051330566,0.024841309,0.02116394,-0.03213501,-0.011451721,0.03704834,-0.007865906,-0.020523071,-0.061157227,-0.030258179,0.011009216,0.015991211,-0.056243896,0.012374878,0.01600647,0.027160645,0.0059280396,-0.012786865,-0.023498535,-0.010231018,-0.029922485,-0.041137695,-0.00932312,-0.036376953,0.008430481,0.04574585,-0.035095215,-0.0031833649,-0.0063285828,-0.0035915375,0.0071525574,0.01586914,-0.00033688545,-0.005241394,-0.041809082,0.0262146,0.01361084,0.0055618286,0.01940918,0.041931152,0.02003479,0.008491516,0.04043579,0.011184692,-0.009147644,-0.04675293,0.023666382,-0.029006958,-0.011054993,0.006324768,-0.016479492,-0.006462097,-0.0231781,-0.012840271,-0.031921387,0.021942139,-0.019439697,0.00983429,0.039245605,-0.024490356,-0.037719727,-0.05722046,-0.008804321,0.017913818,0.0848999,0.0155181885,-0.014450073,-0.06890869,-0.020370483,0.018951416,0.013885498,0.005680084,-0.015914917,-0.009475708,-0.005012512,-0.014831543,-0.012756348,-0.018981934,0.033691406,-0.008506775,-0.013168335,0.020126343,-0.0031661987,0.020980835,0.005458832,-0.0036468506,0.030838013,-0.017868042,-0.012573242,-0.03250122,0.03363037,-0.0026168823,-0.020202637,-0.055114746,0.046173096,0.00623703,0.044830322,-0.043060303,-0.0005030632,-0.002910614,0.016067505,0.018356323,-0.012992859,-0.013763428,0.011054993,-0.052947998,-0.09893799,0.028549194,-0.014572144,0.020751953,-0.005104065,0.011474609,0.043823242,-0.0036392212,0.0104599,0.029663086,-0.019851685,-0.011711121,-0.04815674,-0.041381836,-0.018417358,-0.013404846,-0.024383545,0.023208618,-0.01486969,0.0066452026,-0.003944397,-0.021133423,0.036590576,0.009056091,-0.004650116,0.023620605,0.012413025,0.017791748,0.042938232,0.008430481,-0.03665161,0.0070152283,0.018173218,-0.0012578964,-0.0006661415,0.026550293,0.024124146,-0.02619934,0.005947113,-0.004383087,-0.012954712,-0.020751953,-0.017944336,-0.0051193237,0.036315918,0.008621216,-0.030654907,0.025756836,0.014801025,-0.02507019,-0.016021729,0.02104187,0.034606934,-0.029037476,0.017745972,0.031219482,0.05633545,-0.034576416,0.0023422241,0.012962341,0.033416748,0.022521973,-0.0023479462,-0.021133423,0.020965576,-0.016159058,0.011222839,0.0012722015,-0.024780273,0.0071525574,0.0030403137,0.013473511,0.022918701,0.019210815,-0.03262329,-0.029876709,-0.0007915497,-0.01084137,-0.010101318,0.021728516,0.030197144,0.021255493,-0.01272583,0.035125732,0.019500732,-0.031280518,-0.013717651,-0.009086609,0.03289795,-0.019104004,-0.023483276,0.022888184,0.008743286,0.038879395,-0.048858643,-0.013839722,0.009155273,-0.00233078,-0.014045715,-0.047576904,-0.029418945,0.0037822723,0.023330688,0.011894226,0.0055656433,0.013534546,-0.00166893,0.00063323975,0.016799927,0.000702858,-0.013511658,0.0016174316,-0.049591064,-0.01285553,-0.005012512,0.0008420944,-0.010444641,0.005428314,-0.022964478,-0.02897644,0.001996994,-0.0096206665,0.005924225,-0.022857666,0.008201599,0.030715942,-0.01247406,0.014656067,-0.013023376,-0.019134521,0.0015392303,0.00793457,0.026062012,-0.039978027,0.019638062,-0.020202637,0.0014772415,-0.0053977966,0.029464722,0.024139404,0.025436401,-0.0098724365,0.020584106,-0.047027588,0.032318115,-0.04107666,0.006385803,0.01083374,-0.022445679,-0.011566162,-0.013870239,-0.016983032,0.034118652,-0.017623901,0.007850647,-0.027114868,-0.021911621,-0.010238647,-0.053527832,0.03189087,0.023834229,0.031066895,-0.026168823,0.003944397,0.0115737915,0.005569458,-0.013435364,-0.0007224083,0.003660202,0.010566711,0.027145386,0.001613617,-0.036315918,-0.022659302,0.015716553,0.0012969971,-0.055633545,-0.031555176,-0.028411865,0.016983032,0.00223732,-0.00844574,-0.017654419,-0.008270264,-0.0062789917,-0.038208008,0.016174316,0.0077438354,0.02722168,0.018371582,-0.018371582,-0.0036525726,0.022735596,-0.023330688,0.042541504,-0.006504059,-0.006664276,-0.05053711,0.0074424744,0.026794434,0.029769897,-0.011871338,-0.01713562,0.014030457,-0.03475952,-0.051483154,-0.006084442,-0.009475708,0.010688782,-0.008392334,-0.019302368,-0.06124878,-0.004776001,-0.018875122,-0.0015182495,0.016174316,0.015434265,0.014045715,0.0030670166,-0.0060539246,-0.019500732,-0.035095215,-0.03488159,0.010429382,0.011688232,0.007003784,0.0039711,0.04244995,0.0034046173,-0.020706177,0.015289307,-0.005050659,0.016952515,-0.016677856,0.010177612,-0.008781433,0.016983032,-0.0046195984,-0.018188477,-0.02935791,0.004760742,0.0836792,0.010887146,0.0061950684,-0.011146545,-0.010345459,0.01335144,0.026138306,-0.047851562,0.004310608,-0.028686523,0.033843994,-0.0051116943,0.0104522705,0.0043029785,0.017654419,-0.02217102,-0.05441284,-0.0043144226,0.010070801,-0.002401352,-0.04751587,-0.01966858,-0.06744385,-0.004436493,-0.020462036,-0.02154541,-0.0053749084,-0.008407593,-0.006389618,-0.09161377,0.0024337769,0.05569458,0.012802124,0.009246826,-0.021270752,0.022125244,0.015655518,-0.02420044,-0.025390625,0.02168274,-0.02935791,-0.020858765,-0.029663086,0.04815674,-0.01876831,-0.029953003,0.027526855,0.0037574768,0.015365601,0.0037956238,0.0029296875,-0.011795044,0.013839722,-0.009864807,0.018737793,0.0034046173,-0.027008057,0.020004272,-0.043823242,0.033355713,0.009002686,-0.012069702,0.008804321,0.028823853,0.041290283,-0.036499023,-0.016525269,0.036010742,0.0026016235,0.051635742,-0.025802612,0.049224854,0.008995056,-0.0059509277,0.01864624,-0.006038666,-0.025100708,-0.048614502,-0.021148682,0.025558472,-0.0035648346,0.017074585,-0.01651001,-0.0138549805,0.023849487,-0.0058937073,0.017028809,-0.013366699,-0.014518738,-0.023666382,0.015556335,0.02192688,-0.0066223145,-0.0026683807,0.019378662,0.008964539,0.033599854,-0.008842468,-0.017944336,0.015731812,0.026016235,-0.012931824,0.006313324,0.013381958,0.014305115,0.007835388,0.033447266,0.013870239,-0.022964478,-0.019012451,-0.026916504,-0.017227173,-0.004573822,-0.002532959,-0.006996155,0.0031433105,0.016494751,0.0005054474,-0.03652954,-0.0012893677,-0.032318115,-0.034088135,0.008392334,-0.026473999,0.0146102905,0.0057640076,0.0096206665,0.007583618,0.0021629333,0.045196533,0.0034103394,0.008911133,0.035461426,0.028823853,0.012077332,-0.022277832,0.0055007935,-0.008018494,-0.009590149,0.015083313,-0.023223877,0.0067863464,0.032073975,-0.017456055,0.006462097,-0.0016908646,0.02178955,0.0022583008,0.0079193115,0.0045814514,0.004711151,-0.0259552,0.03062439,-0.04827881,0.0099487305,0.018478394,0.0029678345,0.004272461,-0.016860962,-0.022567749,0.015853882,-0.0033130646,-0.021652222,0.045288086,-0.0105896,0.021896362,-0.015365601,-0.042541504,-0.001077652,-0.02407837,-0.014183044,0.028900146,-0.00356102,-0.005340576,0.011001587,-0.029846191,0.0446167,-0.0340271,0.016784668,0.0026111603,0.000019907951,-0.009300232,-0.023468018,-0.002161026,-0.012573242,-0.017562866,-0.003332138,-0.004966736,0.04675293,0.028305054,0.017684937,0.02494812,0.010856628,-0.0047569275,-0.030166626,-0.02281189,0.005710602,-0.020263672,0.013786316,-0.04196167,0.040527344,0.046539307,-0.0007095337,0.0368042,0.04159546,0.035949707,0.00005620718,0.010375977,-0.019439697,0.0036201477,-0.008743286,0.022827148,0.008728027,0.04711914,-0.028411865,0.018661499,0.0041885376,0.016860962,-0.03213501,0.03289795,0.06768799,0.012901306,0.0026607513,0.033569336,-0.009841919,-0.000600338,-0.01876831,-0.0059394836,0.05505371,0.0043563843,0.0340271,0.03616333,0.020828247,-0.014762878,0.017059326,-0.02911377,-0.0362854,0.048706055,0.020736694,-0.023117065,-0.005935669,-0.013908386,0.0073127747,-0.055541992,-0.021453857,0.020721436,0.0032176971,0.012710571,-0.010383606,-0.019073486,-0.012229919,0.010551453,0.01499176,0.016860962,-0.019943237,0.026733398,0.027236938,0.009773254,0.026000977,0.0030002594,0.0211792,-0.027954102,-0.031433105,0.008407593,0.023284912,-0.011062622,0.004699707,0.029785156,0.01991272,0.04800415,0.03982544,-0.0093688965,0.00031614304,0.04031372,0.0022239685,-0.0013151169,0.03677368,0.0262146,0.016830444,0.045562744,0.042877197,0.039611816,-0.035827637,0.0029087067,-0.007904053,0.019165039,-0.0040397644,-0.019241333,0.006198883,-0.008544922,0.02406311,0.010726929,-0.030654907,0.031280518,0.021621704,0.0021266937,-0.006126404,-0.0056114197,0.000770092,-0.002746582,0.009803772,0.008453369,-0.013046265,0.022613525,0.00881958,0.02331543,-0.015167236,0.031951904,-0.0043258667,-0.025100708,-0.0038719177,0.0048103333,-0.043395996,0.019546509,-0.0093688965,0.0031337738,-0.039276123,0.012565613,0.017929077,0.004875183,0.02998352,0.00094270706,-0.0035209656,0.0056381226,0.030715942,0.012779236,0.0022964478,-0.009132385,-0.029708862,0.045410156,0.039245605,0.0009050369,0.00806427,-0.007843018,0.009399414,0.02255249,-0.007030487,0.015716553,-0.0047035217,-0.010276794,-0.04727173,0.013511658,0.025054932,0.025177002,0.03857422,0.0035686493,-0.009124756,-0.007144928,0.03277588,-0.0050201416,-0.009605408,-0.023727417,0.027786255,-0.0066833496,0.05227661,0.04473877,-0.00434494,0.022491455,-0.024246216,-0.020248413,0.004611969,-0.011062622,0.0053138733,-0.019439697,0.008956909,-0.021759033,0.026687622,-0.021575928,-0.039245605,-0.0029144287,-0.0074272156,-0.013870239,-0.037719727,0.004421234,0.0005226135,0.015777588,0.03338623,0.017684937,-0.025390625,0.06945801,-0.01727295,0.036315918,-0.014152527,-0.013473511,0.05038452,0.042633057,0.0390625,0.02293396,0.02029419,-0.016921997,0.010551453,0.045135498,0.020751953,0.012962341,-0.0016040802,-0.029663086,0.040496826,0.0010128021,0.021438599,-0.0022010803,-0.013130188,-0.0049476624,-0.006198883,-0.0064888,0.002199173,0.0026836395,0.019989014,0.046722412,-0.028717041,-0.011802673,-0.020629883,-0.024978638,0.034942627,-0.0027694702,0.0010719299,-0.008148193,-0.017028809,0.02142334,-0.027267456,-0.0119018555,0.0019989014,0.036315918,-0.0418396,-0.0121154785,-0.007522583,0.014923096,-0.031982422,0.029632568,0.021911621,-0.0059814453,0.016174316,0.040283203,-0.007286072,0.04537964,-0.012626648,0.03414917,0.033447266,-0.011581421,-0.020965576,-0.0054092407,0.014694214,-0.015571594,0.0047912598,0.028259277,-0.0124053955,0.0050811768,-0.0000975728,-0.020187378,0.0032577515,0.016479492,-0.008872986,-0.0052223206,-0.0069274902,-0.020828247,0.0067749023,0.006576538,0.006462097,0.00016891956,0.014961243,-0.010307312,0.0024604797,0.04135132,0.011634827,-0.049102783,-0.0025138855,0.015686035,0.015365601,-0.025436401,-0.023727417,-0.01121521,-0.04333496,0.012687683,0.014129639,0.008598328,0.0034637451,-0.029144287,0.004131317,0.022857666,0.016067505,0.0335083,0.0075569153,-0.010543823,0.020385742,-0.017120361,0.012916565,-0.010124207,0.0014858246,0.013389587,0.021438599,-0.020568848,-0.032073975,0.034851074,0.00026512146,0.0035820007,0.0075912476,-0.005580902,0.03466797,-0.019866943,-0.01625061,0.003929138,0.019073486,-0.0055274963,-0.027816772,-0.026489258,0.027877808,0.05105591,-0.02532959,-0.0006432533,0.011497498,0.013839722,0.029251099,0.031280518,0.008079529,0.036071777,0.026901245,-0.0074005127,-0.018554688,0.020965576,-0.02015686,-0.029312134,0.018325806,-0.014450073,-0.02268982,0.03060913,0.0047302246,0.0031223297,-0.02418518,-0.020736694,-0.0093307495,-0.015556335,0.012939453,-0.016586304,0.005264282,-0.026626587,-0.016952515,0.013534546,-0.0010566711,-0.029464722,-0.029922485,-0.013954163,-0.014884949,-0.058563232,0.007965088,-0.01838684,0.0067367554,-0.0012798309,0.0027675629,0.010978699,0.042938232,0.0028705597,0.0006055832,-0.000105798244,0.027359009,0.010253906,0.02192688,0.015808105,-0.0013637543,-0.030654907,-0.008850098,-0.009475708,-0.0039253235,0.017211914,-0.027877808,0.026153564,0.023086548,-0.00573349,0.0010318756,-0.010856628,-0.0034885406,-0.0021095276,-0.050842285,-0.02041626,0.015670776,0.030410767,-0.011428833,-0.009399414,0.04260254,-0.01550293,-0.019805908,0.02684021,0.043395996,0.010116577,0.0385437,-0.012313843,-0.023910522,-0.0076560974,-0.0045280457,-0.011894226,0.0034542084,0.01763916,0.0058135986,0.006729126,0.012184143,0.029388428,-0.007446289,0.0027828217,0.026885986,0.016906738,-0.012817383,0.03201294,0.014961243,-0.010009766,-0.012687683,-0.017562866,0.033355713,0.040039062,0.0073127747,0.004676819,0.002319336,0.002664566,-0.003993988,0.0009832382,0.02204895,-0.014945984,-0.03152466,-0.010932922,-0.014732361,0.024383545,-0.0068588257,-0.00032234192,0.012954712,0.008079529,-0.02558899,-0.029815674,-0.008506775,0.014289856,0.0051078796,-0.006652832,-0.0121154785,0.006652832,0.025665283,-0.032104492,0.011665344,-0.05215454,-0.030838013,-0.01235199,-0.02003479,0.018722534,0.0041542053,-0.014884949,-0.00082206726,0.0035953522,0.0041618347,0.002981186,0.021499634,-0.019363403,-0.009864807,0.019515991,0.017227173,-0.009971619,0.017425537,-0.010795593,-0.004535675,0.011428833,-0.008796692,0.0103302,-0.020370483,0.048706055,0.0024852753,-0.0020771027,0.026275635,0.0042915344,0.012283325,-0.00067567825,-0.004863739,-0.0015649796,0.000910759,0.030548096,-0.020614624,-0.020050049,0.010375977,-0.012718201,-0.042663574,0.0054130554,0.029678345,0.029541016,-0.01751709,0.045776367,-0.013908386,-0.02079773,0.030136108,0.014221191,-0.01878357,-0.0014781952,0.03427124,0.0018959045,-0.006336212,-0.0018024445,-0.026046753,-0.03036499,-0.0016527176,0.022460938,-0.0137786865,-0.006565094,0.032958984,0.015777588,0.056243896,-0.00062704086,0.017730713,0.025039673,0.0018787384,0.031036377,0.009223938,0.04977417,0.0034637451,-0.02482605,0.0078048706,0.008605957,-0.022445679,-0.00070667267,-0.016296387,0.002691269,-0.029067993,0.0036563873,0.011886597,0.030303955,-0.016983032,0.008811951,-0.02357483,-0.0049858093,-0.027267456,0.00083112717,-0.021942139,0.006629944,0.035308838,0.014595032,0.0074424744,-0.010437012,-0.02420044,0.011604309,0.040740967,-0.000682354,-0.035186768,-0.0052757263,0.016586304,0.0054855347,0.0005750656,-0.001039505,-0.027908325,-0.018173218,-0.0025196075,-0.0025291443,0.0033855438,-0.0049934387,0.025497437,0.016113281,-0.00844574,0.0088272095,0.025558472,-0.007827759,-0.0061073303,0.015533447,0.003490448,0.030578613,0.03753662,-0.02116394,0.01953125,0.02822876,-0.033081055,0.051483154,0.005607605,0.011177063,-0.01637268,0.006439209,-0.040527344,-0.0074539185,-0.0050086975,-0.002401352],"createdAt":"2026-04-18T18:44:00.731Z","updatedAt":"2026-04-22T13:30:56.319Z","lastSeenAt":"2026-04-22T13:30:56.319Z","tsv":"'/api/v1/cards/98':62,175 '/request':17,34,167 '0.02':16,33,99,166 '000':94 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':85 '20':93 '402 payment required' '6':104 'Base network API' 'USDC micropayment API' 'accept':70,257 'access':68,114,184 'actual':215 'addit':209 'advertis':113,128 'agent':223 'ai':137 'amount':91 'analysi':141 'analyt':136 'api':5,22,53,67,107,183,198 'base':8,25,57,87,95 'base-network' 'behind':174 'beyond':179 'broader':43 'call':12,29 'catalog':131 'challeng':78,242 'classif':143 'confirm':249 'connect':204 'content':210 'contract':84 'convers':160 'data':135 'decim':105 'doc':195 'document':178,235 'embed':144 'endpoint':6,23,36,133,213,251 'equival':97 'estim':154 'exampl':192 'exchang':149 'feed':148 'financ':145 'form':248 'format':220 'function':173 'gas':153 'gate':3,20,73 'generat':161 'geocod':158 'grant':116 'header':122 'host':54 'howev':170 'infrastructur':156 'input':216 'key':108 'label':181 'land':126 'learn':139 'limit':111 'list':64,230 'live':244 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':138 'maximum':90 'network':58 'no-api-key' 'openapi':188 'oper':253 'output':238 'page':127,199 'paramet':217 'part':40 'pay':10,27,50 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':49 'payment':77,79,121,258 'per':11,28,51,100 'point':169 'post':71 'post-method' 'premium':4,21,66,182 'premium API access' 'price':147,168,196 'prompt':206 'protocol':48 'provid':124,233 'publish':234 'pure':117 'quot':152 'rate':110,150 'readi':255 'render':201 'request':52,72,101 'request/response':191 'resourc':61 'respons':219 'schema':189,239 'sentiment':140 'settl':81 'span':134 'specif':60,172 'stub':229 'suit':44 'summar':142 'token':151 'treat':225 'unit':96 'unknown':222 'usdc':14,31,83,102 'usdc-settlement' 'use':103 'util':157 'valid':159 'via':118 'wallet':205 'web3':146 'well':247 'well-form':246 'wide':130 'x402':2,19,47,76,120,241 'x402 API' 'x402-gated':1,18 'x402-payment-gated' 'x402-protocol':46","prices":[{"id":"325ac325-9a3a-44fc-8b7d-087cf44d8eeb","listingId":"1f4a8224-7c23-4f85-bfa7-a120d9848d02","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/cards/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:00.731Z"}],"sources":[{"listingId":"1f4a8224-7c23-4f85-bfa7-a120d9848d02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:00.731Z","lastSeenAt":"2026-04-22T13:30:56.319Z"}],"details":{"listingId":"1f4a8224-7c23-4f85-bfa7-a120d9848d02","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# After constructing a valid X-PAYMENT header (USDC on Base),\n# POST to the resource:\n\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/98 \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/98"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/98"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource without traditional API key signup","Agent-driven pay-per-call workflows settled on-chain via USDC on Base","Exploring x402 protocol integrations for micropayment-gated services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need documented request/response schemas before integration","Applications requiring free or fiat-settled API access","Production workloads that depend on well-documented endpoint behavior"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.625Z"},"updatedAt":"2026-04-22T13:30:56.319Z"}}