{"id":"f5194471-0393-4efa-9762-b904ae328752","shortId":"FnSCZy","kind":"x402","title":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","tagline":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/keys/76` is listed as \"Premium API Access\" and costs up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.\n\nThe broader platform advertises 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 listed at $0.02 per call. This particular endpoint (`/api/v1/keys/76`) does not clearly map to any of those named categories — its exact functionality beyond \"Premium API Access\" is not documented.\n\nThe endpoint is live and returns a valid x402 challenge (version 1, scheme \"exact\") when called without payment. It accepts POST requests, settles in USDC on Base, and has a payment timeout of 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API access","Base network API","lowpaymentfee","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The exact functionality of /api/v1/keys/76 ('Premium API Access') is not described anywhere in the crawled content","No example requests or responses are available","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/76","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/keys/76","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 challenge, but there is no OpenAPI schema, no documentation of request/response formats, and the exact functionality of this specific endpoint (/api/v1/keys/76) is unclear beyond the generic label 'Premium API Access'. Pricing is clear but everything else must be guessed.","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":"2026-04-21T22:16:20.190Z","embedding":[-0.030838013,-0.021713257,0.046020508,0.007888794,0.023223877,-0.037994385,-0.014053345,0.04324341,0.05178833,-0.078186035,0.021911621,-0.054229736,-0.033966064,-0.039642334,-0.04244995,0.013305664,-0.022003174,-0.0034637451,-0.053710938,0.028152466,0.016693115,-0.035949707,-0.01449585,0.03817749,0.004135132,-0.006652832,-0.011383057,-0.028366089,-0.005718231,-0.04397583,0.041625977,-0.026977539,-0.027999878,0.0098724365,-0.0158844,-0.007896423,-0.0050354004,0.033355713,0.011985779,-0.010345459,-0.013435364,-0.073791504,0.0016555786,-0.008125305,-0.0574646,-0.0017271042,-0.0040779114,-0.025543213,-0.0090408325,-0.009681702,-0.021865845,-0.010734558,-0.014343262,-0.01234436,0.013832092,0.0070266724,-0.016326904,-0.020980835,0.028335571,0.012870789,0.007511139,-0.05117798,-0.012336731,-0.0010385513,0.0127334595,0.060302734,-0.021026611,0.049316406,0.021896362,0.053344727,0.032440186,0.057159424,0.013580322,0.01651001,-0.008621216,-0.007293701,0.0012178421,0.07043457,-0.008804321,-0.018814087,-0.014984131,-0.019821167,-0.023040771,-0.0028152466,-0.013923645,-0.04711914,-0.029830933,-0.00242424,-0.009681702,0.023757935,-0.08453369,-0.01361084,-0.005176544,-0.0012388229,0.0178833,-0.007282257,-0.02432251,0.033081055,-0.007648468,0.018997192,0.006011963,-0.04348755,0.01133728,0.006668091,0.03668213,0.0619812,0.014221191,0.03930664,0.0096588135,-0.02619934,-0.040985107,0.0068511963,-0.02758789,-0.021026611,0.018630981,-0.007549286,-0.02130127,0.010917664,-0.032836914,0.009918213,-0.037994385,0.040161133,0.025115967,-0.016204834,0.0074386597,-0.04776001,-0.0056419373,0.015823364,-0.012573242,-0.017990112,0.0018177032,0.0140686035,0.028915405,-0.00032138824,-0.0385437,0.008705139,-0.013977051,-0.030670166,-0.055633545,-0.03074646,0.022979736,-0.026153564,0.027694702,0.037994385,-0.11010742,-0.008476257,-0.053253174,0.0026569366,-0.02368164,-0.0027389526,0.0062217712,0.01826477,-0.0069885254,-0.0009803772,-0.013618469,-0.033569336,0.005340576,0.034729004,-0.017242432,0.056427002,-0.0055160522,0.037261963,0.027420044,0.0154800415,0.0262146,0.041992188,0.008895874,-0.062683105,-0.072143555,-0.017150879,0.00060892105,-0.0062179565,-0.019515991,0.030227661,-0.020446777,-0.07244873,-0.023162842,-0.0045318604,-0.015823364,-0.03741455,-0.012702942,-0.029678345,0.010238647,-0.0026416779,-0.056640625,-0.011756897,-0.016418457,0.06530762,0.011878967,0.019119263,0.027420044,-0.02420044,0.050079346,0.0335083,-0.02029419,-0.03466797,0.015853882,-0.021911621,0.023529053,-0.0051994324,0.0063209534,-0.038604736,0.037078857,0.059417725,0.028213501,-0.026489258,-0.020446777,-0.057037354,-0.053588867,-0.030670166,0.01651001,0.011695862,0.00818634,0.026855469,-0.028244019,-0.019836426,0.013793945,0.0033493042,0.007785797,0.06933594,0.00003284216,-0.020187378,0.0155181885,0.02558899,-0.04574585,0.03781128,0.033111572,0.016159058,-0.023590088,-0.025527954,0.020584106,0.024032593,-0.02619934,0.0025463104,-0.022964478,0.03677368,-0.0055351257,0.008682251,0.013259888,-0.01626587,-0.015930176,-0.031707764,-0.03338623,0.024368286,-0.012016296,-0.02168274,-0.030303955,-0.07165527,0.03302002,0.030929565,0.028244019,-0.013404846,0.014656067,-0.028793335,-0.0116119385,-0.059143066,0.056274414,0.07342529,-0.01146698,-0.00819397,0.019470215,-0.01828003,-0.029647827,0.0020427704,-0.013473511,-0.03604126,-0.016326904,0.015007019,-0.038726807,-0.0054244995,0.01802063,0.032073975,0.0574646,-0.013961792,-0.044769287,-0.03540039,-0.0038547516,-0.0025157928,-0.02909851,-0.024276733,-0.005908966,0.013160706,0.04071045,-0.007621765,0.022705078,0.0024032593,0.009086609,0.0007543564,-0.0033111572,-0.0060195923,-0.028625488,0.029312134,0.017211914,-0.06060791,0.003004074,-0.012130737,0.048736572,-0.043151855,0.03048706,-0.01612854,0.012084961,0.046447754,-0.006286621,-0.054229736,-0.0014448166,0.024597168,0.014030457,0.04537964,0.018188477,-0.024993896,-0.004764557,0.07446289,-0.023605347,-0.02670288,0.010955811,0.008644104,0.029281616,-0.005504608,-0.05316162,-0.028320312,-0.011199951,-0.029708862,0.02279663,-0.026870728,0.030456543,-0.0096206665,0.0074653625,-0.022506714,0.011993408,-0.035827637,0.02217102,-0.030044556,0.004447937,-0.019561768,-0.02067566,-0.00017809868,0.01210022,-0.015899658,0.004207611,0.054107666,0.026046753,-0.0074386597,-0.025939941,-0.03152466,-0.013977051,0.0026130676,0.029312134,0.027297974,0.018432617,0.050750732,-0.029266357,0.014656067,0.026153564,0.029724121,0.031951904,-0.0104599,0.0043258667,-0.060150146,-0.05621338,-0.022994995,-0.01928711,0.025283813,0.0090408325,-0.0011377335,0.059448242,0.0024871826,-0.025375366,-0.052246094,0.019866943,-0.026687622,-0.018478394,0.048553467,-0.031143188,-0.038726807,0.01626587,-0.002046585,0.003610611,0.044647217,0.03741455,0.007888794,0.07330322,0.042266846,-0.0045051575,0.0096588135,0.0047035217,0.01889038,0.007637024,-0.018920898,-0.030853271,-0.0048675537,0.02279663,-0.017669678,-0.028625488,-0.06341553,0.067871094,0.03540039,0.08746338,0.012588501,0.005153656,0.05444336,-0.024658203,0.02458191,-0.022323608,-0.010269165,-0.01676941,-0.05380249,0.024887085,-0.011505127,-0.0052108765,-0.035949707,0.033721924,0.007171631,0.023239136,-0.046813965,0.06088257,0.00041675568,-0.007217407,0.025482178,0.0038108826,0.045959473,0.06439209,-0.049316406,0.01789856,0.02796936,-0.03125,0.011627197,0.03817749,-0.015182495,-0.006603241,-0.05657959,-0.020706177,-0.0043640137,-0.0038967133,-0.048919678,-0.006401062,0.009727478,0.023666382,0.031555176,-0.024887085,-0.014091492,-0.011138916,-0.030273438,-0.051361084,0.006576538,-0.043273926,0.00012564659,0.04660034,-0.0335083,-0.0048713684,0.013832092,-0.010353088,-0.018829346,0.01637268,0.022384644,0.0010271072,-0.0423584,0.034423828,0.0065307617,0.003982544,0.010429382,0.021957397,0.012626648,0.032470703,0.033691406,0.013687134,-0.015060425,-0.07116699,0.02482605,-0.04876709,0.011947632,0.02255249,-0.022994995,0.0029640198,-0.019546509,-0.020385742,-0.021743774,0.007904053,-0.030273438,-0.0059051514,0.022766113,-0.02418518,-0.019744873,-0.051727295,-0.017868042,-0.014640808,0.05908203,0.03643799,0.009300232,-0.055480957,-0.011833191,0.011451721,0.008087158,0.016342163,-0.014770508,-0.0032234192,-0.00730896,-0.0071754456,-0.005344391,-0.0070152283,0.019699097,-0.010627747,-0.015853882,0.03149414,0.018310547,0.0024909973,0.017700195,0.013519287,0.01524353,-0.022720337,-0.010856628,-0.010818481,0.03842163,0.0056037903,-0.009002686,-0.05291748,0.0423584,0.016967773,0.03817749,-0.037750244,-0.0051193237,-0.0047187805,0.018981934,0.0062561035,-0.0059432983,-0.010231018,-0.01184845,-0.05606079,-0.07897949,0.043914795,-0.016342163,0.028656006,0.014289856,0.008720398,0.020111084,-0.0069274902,-0.006462097,0.026382446,-0.017608643,-0.014030457,-0.028945923,-0.028915405,-0.028686523,-0.00084733963,-0.020339966,0.013336182,-0.023620605,0.020629883,-0.006576538,-0.022460938,0.014984131,-0.004009247,-0.0107040405,0.010055542,0.0022888184,0.024490356,0.045166016,0.011222839,-0.033813477,0.026977539,0.012306213,0.004310608,0.004432678,0.0418396,0.03062439,-0.017562866,-0.0077552795,0.003238678,-0.011230469,-0.010223389,0.0055999756,0.0041046143,0.014457703,-0.009513855,-0.039520264,0.016906738,0.012268066,-0.02897644,-0.016479492,0.020690918,0.016708374,-0.03152466,0.031707764,0.03704834,0.059814453,-0.021591187,-0.006412506,0.010070801,0.03363037,0.011268616,0.0126571655,0.004917145,0.01626587,-0.01600647,0.014945984,-0.009674072,0.0011892319,0.024490356,-0.002878189,0.014160156,0.021133423,0.002149582,-0.01272583,-0.033569336,-0.0029296875,-0.015075684,-0.018875122,0.019363403,0.023162842,0.021148682,-0.023025513,0.02079773,0.016983032,-0.011398315,-0.018447876,-0.006198883,0.029891968,-0.0062217712,-0.016220093,0.0076675415,0.011489868,0.039031982,-0.04071045,-0.01247406,0.015136719,0.0016613007,-0.024871826,-0.046051025,-0.03933716,0.0028839111,0.051605225,-0.003250122,0.01876831,0.023254395,0.0041542053,0.0022621155,0.029418945,-0.001958847,-0.014892578,-0.005554199,-0.026565552,-0.01436615,-0.007980347,-0.0005173683,-0.034851074,0.010887146,-0.009346008,-0.036254883,0.01071167,-0.008132935,-0.0067596436,-0.010467529,0.003458023,0.042022705,-0.0018320084,0.010322571,-0.02229309,-0.035583496,-0.009300232,0.0075950623,0.009780884,-0.047698975,0.025115967,-0.011917114,-0.017608643,0.0019302368,0.008178711,0.01701355,0.024169922,0.004924774,0.029312134,-0.053497314,0.04574585,-0.031555176,0.0062294006,0.0007839203,-0.028762817,-0.0017633438,-0.0134887695,-0.02218628,0.04534912,-0.016036987,-0.007522583,-0.026565552,-0.026397705,-0.009361267,-0.05380249,0.01878357,0.041137695,0.03274536,-0.022857666,-0.0018091202,0.004032135,-0.006298065,-0.016281128,0.013725281,-0.0074653625,0.019439697,0.023513794,-0.0076560974,-0.034423828,-0.03036499,-0.013015747,-0.010612488,-0.03463745,-0.054626465,-0.0054855347,0.021377563,0.00027418137,0.0037784576,-0.033355713,-0.029159546,-0.0014381409,-0.04925537,0.014892578,0.0031547546,0.004966736,-0.0027542114,-0.023651123,0.013343811,0.020843506,-0.026412964,0.040496826,0.018356323,-0.009513855,-0.03543091,0.017181396,0.035980225,0.020950317,-0.0017089844,-0.010025024,-0.010978699,-0.013343811,-0.0463562,-0.0077400208,-0.0010547638,-0.0026893616,-0.0043792725,0.00491333,-0.0435791,-0.0054855347,-0.020339966,-0.004852295,0.030410767,0.020706177,0.007335663,0.015808105,0.021774292,-0.013267517,-0.019424438,-0.029541016,0.015945435,0.010620117,-0.0038318634,0.030914307,0.040100098,0.009208679,-0.025161743,0.00680542,0.002002716,0.026397705,-0.013259888,-0.0042533875,-0.028793335,0.005542755,-0.001124382,-0.021774292,-0.0340271,-0.013427734,0.09234619,0.016342163,-0.015098572,-0.005683899,-0.018585205,0.019729614,0.029815674,-0.04727173,-0.00047683716,-0.028884888,0.018310547,-0.020629883,0.0181427,-0.00074386597,-0.0003118515,-0.017166138,-0.051696777,-0.0066452026,-0.0051460266,-0.017578125,-0.06072998,-0.020004272,-0.050476074,0.008178711,-0.011993408,-0.019958496,-0.00806427,0.0015802383,-0.022521973,-0.09899902,0.0036773682,0.05105591,0.016601562,0.0151901245,-0.012504578,0.008255005,0.019012451,-0.049987793,-0.006263733,0.027877808,-0.030914307,-0.021194458,-0.009971619,0.021911621,-0.016433716,-0.0155181885,0.020980835,-0.0056991577,0.030838013,0.0010633469,0.0046691895,-0.01777649,0.014472961,-0.029708862,0.0077590942,-0.007926941,-0.00084638596,0.029266357,-0.04940796,0.017974854,0.022567749,0.005004883,0.008453369,0.028762817,0.037384033,-0.044891357,-0.020767212,0.020477295,-0.0045547485,0.03805542,-0.034118652,0.03353882,0.010520935,-0.013427734,0.029052734,-0.010787964,-0.014091492,-0.04034424,-0.030807495,0.032989502,0.009185791,0.007106781,-0.017593384,0.007537842,0.025253296,0.006000519,0.018188477,-0.019638062,-0.026977539,-0.0206604,-0.004470825,0.011405945,0.0054626465,0.0013742447,0.029449463,0.021392822,0.027374268,0.019515991,-0.011955261,0.008811951,0.017852783,-0.012504578,-0.0050582886,0.020492554,0.0059776306,0.0054626465,0.019180298,-0.00094366074,-0.029815674,0.0027065277,-0.032989502,-0.030044556,0.0029087067,-0.0064086914,-0.018539429,-0.012931824,0.010551453,-0.0067710876,-0.027740479,0.0026226044,-0.040649414,-0.027816772,0.005092621,-0.01651001,0.01979065,-0.0000037550926,0.01600647,0.012084961,0.010612488,0.05279541,0.003932953,-0.001537323,0.0413208,0.030334473,0.016311646,-0.017684937,0.0038795471,-0.01448822,0.0057373047,-0.0004374981,-0.029022217,0.01600647,0.041870117,-0.024032593,0.006576538,0.017211914,0.020584106,-0.023956299,-0.0015916824,-0.005645752,0.015625,-0.012275696,0.039855957,-0.030563354,0.01889038,0.0031986237,-0.0022830963,-0.01374054,-0.014945984,-0.034423828,0.010108948,-0.00043797493,-0.021026611,0.04171753,-0.0077323914,0.022201538,-0.0178833,-0.022323608,0.0154800415,-0.035461426,-0.020767212,0.036315918,-0.0046043396,-0.013923645,0.015045166,-0.02394104,0.038757324,-0.037597656,0.020019531,0.00059604645,-0.013061523,-0.010009766,-0.008583069,-0.019042969,-0.00969696,-0.0069084167,0.0066947937,-0.0065689087,0.050598145,0.02519226,0.0309906,0.059814453,0.014953613,-0.0031738281,-0.03302002,-0.025772095,0.006187439,-0.012214661,0.030258179,-0.0077285767,0.0473938,0.02748108,0.012023926,0.031066895,0.025924683,0.020355225,-0.0016908646,0.005050659,-0.013847351,0.008903503,0.0015001297,0.02520752,-0.010292053,0.038909912,-0.037902832,0.021377563,0.021697998,0.021865845,-0.024658203,0.044830322,0.07220459,0.02079773,-0.016830444,0.04522705,-0.006374359,-0.011184692,-0.020141602,-0.01612854,0.046203613,0.00894928,0.03778076,0.053741455,0.011436462,0.0073928833,0.02519226,-0.025939941,-0.035064697,0.07122803,0.027633667,-0.015350342,-0.0039405823,-0.011940002,0.0011301041,-0.043151855,-0.01965332,0.013381958,-0.013946533,0.017425537,-0.011665344,-0.0029029846,-0.015022278,0.0043792725,0.029815674,0.015640259,-0.015625,0.03286743,0.02708435,-0.008964539,0.025802612,0.011009216,0.026306152,-0.033843994,-0.03375244,0.0073928833,0.018325806,-0.004825592,-0.010772705,0.019927979,0.021636963,0.057159424,0.053863525,-0.021560669,0.024490356,0.041381836,0.010299683,0.002199173,0.058929443,0.034729004,0.023986816,0.038726807,0.036010742,0.032592773,-0.04336548,0.0025291443,0.015533447,0.001461029,0.0022010803,-0.012367249,0.010383606,-0.021621704,0.017364502,-0.0049095154,-0.008895874,0.028427124,0.018173218,0.0009908676,0.000034332275,0.006038666,0.009361267,-0.0041885376,-0.0054359436,0.017562866,-0.020507812,0.02267456,0.009544373,0.02142334,-0.019439697,0.029388428,-0.0009560585,-0.011665344,-0.009033203,0.017211914,-0.05331421,0.0060691833,0.008651733,0.004562378,-0.04446411,0.020568848,0.02519226,-0.0059013367,0.040374756,0.0158844,-0.0053482056,-0.00982666,0.009963989,0.0032539368,-0.0042648315,-0.014419556,-0.02734375,0.013648987,0.04144287,0.010528564,0.01309967,-0.015457153,0.00028824806,0.003627777,-0.0072631836,0.0046424866,-0.015045166,-0.018554688,-0.028701782,0.015182495,0.037078857,0.016616821,0.046051025,-0.014328003,-0.023040771,0.01751709,0.035186768,-0.00051116943,0.0129470825,-0.014877319,0.025360107,-0.0006661415,0.05038452,0.036834717,0.018081665,0.026489258,-0.022766113,-0.026672363,0.007457733,0.0051612854,0.025527954,-0.014732361,0.014587402,0.008651733,0.024932861,-0.019638062,-0.032836914,0.00017344952,-0.015853882,-0.012420654,-0.023971558,0.009094238,0.014587402,0.02079773,0.048065186,0.02796936,-0.019836426,0.062194824,-0.011047363,0.051086426,-0.012825012,-0.02079773,0.037475586,0.019866943,0.030258179,0.014656067,0.015945435,-0.02760315,0.012008667,0.043823242,0.030593872,0.012687683,0.015899658,-0.027877808,0.038208008,0.0071983337,0.037475586,-0.0033664703,-0.0032424927,0.008514404,-0.0014476776,-0.012481689,-0.0001244545,-0.0061683655,-0.006252289,0.04324341,-0.03652954,-0.014526367,-0.023284912,-0.027511597,0.012168884,-0.017547607,0.013465881,-0.010467529,-0.020477295,0.010902405,-0.02949524,-0.02532959,-0.0020275116,0.025924683,-0.046783447,-0.014381409,0.00039958954,0.024124146,-0.021530151,0.026901245,0.02897644,-0.007965088,0.004142761,0.044433594,-0.012382507,0.027114868,-0.014549255,0.022079468,0.04220581,-0.0002655983,-0.015151978,0.002008438,0.0051612854,-0.013114929,0.018356323,0.02758789,-0.024551392,0.0009608269,0.0078048706,-0.022720337,-0.002565384,0.0021705627,-0.0024375916,0.005332947,-0.009025574,-0.0058898926,-0.011268616,0.009994507,0.0073623657,-0.0034999847,-0.008804321,-0.010688782,0.017044067,0.034820557,0.013633728,-0.035827637,-0.0020275116,0.010528564,0.011917114,-0.010391235,-0.008621216,0.0015983582,-0.047821045,0.010467529,0.018661499,0.015945435,0.0049819946,-0.026046753,0.004257202,0.024917603,0.010795593,0.014915466,-0.0010728836,-0.0077552795,0.017684937,-0.020324707,-0.015281677,-0.00907135,-0.006439209,0.019454956,0.026229858,-0.013366699,-0.028808594,0.023345947,0.0012559891,0.010513306,0.0069236755,-0.01159668,0.030181885,-0.008338928,-0.007713318,-0.004333496,0.020065308,-0.020889282,-0.014839172,-0.011627197,0.03488159,0.05496216,-0.0077209473,-0.011947632,0.022903442,0.006816864,0.012199402,0.03503418,0.003484726,0.044128418,0.022491455,-0.013519287,-0.017333984,0.012649536,-0.006134033,-0.017303467,0.017822266,-0.014144897,-0.029205322,0.021621704,0.010414124,0.00053071976,-0.033355713,-0.017715454,-0.008476257,-0.010848999,0.02784729,-0.015167236,0.009185791,-0.02671814,-0.00047898293,0.0035305023,-0.0050849915,-0.04458618,-0.025939941,0.0038967133,-0.010597229,-0.0569458,0.008506775,-0.033203125,0.0034503937,-0.019058228,-0.0107803345,0.0022392273,0.03543091,-0.009010315,0.0018234253,0.012023926,0.024169922,0.026489258,0.0067329407,0.0335083,-0.025787354,-0.02218628,-0.028259277,0.008125305,-0.011352539,0.018463135,0.005153656,0.033569336,0.02142334,0.0041046143,-0.0040397644,-0.0077552795,-0.010719299,-0.012336731,-0.015533447,-0.017715454,0.028030396,0.010025024,-0.0143966675,-0.005870819,0.051940918,-0.020019531,-0.012039185,0.026016235,0.053375244,0.005531311,0.03692627,-0.0037822723,-0.014823914,-0.006046295,0.0061836243,-0.023590088,0.009338379,0.023620605,-0.0022773743,0.0022773743,0.0012054443,0.0044174194,-0.015060425,-0.0020751953,0.027786255,0.0049705505,-0.009208679,0.023101807,0.007709503,0.010696411,-0.021621704,-0.018173218,0.008026123,0.036895752,0.010238647,0.015205383,-0.0048179626,0.006526947,-0.018081665,0.019622803,0.009986877,-0.013450623,-0.043518066,-0.017730713,-0.045196533,0.023544312,0.0104522705,0.008308411,0.0009636879,0.013290405,-0.017196655,-0.03152466,-0.015113831,0.015731812,0.012931824,-0.00554657,-0.024505615,0.005344391,0.013015747,-0.0309906,-0.0063438416,-0.04345703,-0.03616333,-0.0035552979,-0.03253174,0.016159058,0.0062294006,-0.012031555,0.0034732819,-0.008255005,0.0029201508,-0.0024223328,0.021759033,-0.009292603,-0.0002603531,0.016143799,0.017944336,-0.016220093,0.008872986,-0.019104004,0.0073661804,0.032043457,-0.0076828003,0.012512207,-0.0143966675,0.03225708,-0.01537323,-0.00365448,0.02670288,-0.006122589,0.008888245,-0.027114868,0.0073013306,-0.0043563843,-0.0006709099,0.037963867,-0.023712158,-0.026657104,-0.0015916824,-0.020767212,-0.029525757,-0.0030078888,0.024002075,0.046417236,-0.0045318604,0.039489746,-0.013465881,-0.0010099411,0.02268982,0.0035362244,-0.032836914,-0.012763977,0.044555664,0.010543823,0.0041236877,-0.004638672,-0.0036907196,-0.03137207,-0.0074539185,0.019714355,-0.008087158,-0.01689148,0.03540039,0.0061416626,0.04135132,-0.012458801,0.0115356445,0.010505676,0.01007843,0.01826477,-0.010139465,0.040985107,-0.0035648346,-0.033996582,0.0066184998,0.015045166,-0.027114868,0.0031147003,-0.009483337,-0.004650116,-0.03652954,0.017913818,-0.0074653625,0.027404785,-0.029754639,0.0054130554,-0.021392822,-0.019165039,-0.04168701,-0.008796692,-0.02407837,0.0019073486,0.04321289,0.009590149,0.020980835,0.0041656494,-0.01663208,0.029632568,0.052124023,0.0008621216,-0.030014038,-0.01751709,0.008041382,0.007282257,0.011810303,0.010070801,-0.018325806,-0.012641907,-0.0027999878,-0.016494751,0.010520935,0.0010185242,0.0064811707,0.011146545,-0.008491516,-0.0030918121,0.029159546,-0.0071525574,-0.011520386,-0.00026512146,0.01020813,0.060760498,0.026397705,-0.013084412,0.011405945,0.0104904175,-0.02758789,0.052886963,-0.0043907166,0.026306152,-0.013908386,-0.0043945312,-0.033569336,-0.025878906,-0.009918213,0.00056552887],"createdAt":"2026-04-21T18:32:23.521Z","updatedAt":"2026-04-22T01:02:18.867Z","lastSeenAt":"2026-04-22T01:02:18.867Z","tsv":"'/api/v1/keys/76':58,157 '/request':12,29 '0.02':11,28,83,151 '000':70 '0x8335':75 '1':189 '20':69 '2913':76 '300':211 '6':79 'Base network API' 'USDC API access' 'accept':197 'access':6,23,64,174 'account':99 'across':110 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,22,44,63,97,173 'base':8,25,53,71,78,204 'base-network' 'beyond':171 'broader':106 'call':4,21,153,193 'categori':112,167 'challeng':187 'classif':127 'clear':160 'collect':38 'convers':144 'cost':66 'crawl':225 'crypto-gated API' 'data':113,117 'decim':80 'detail':216 'document':177,217 'embed':128 'endpoint':45,57,109,147,156,179 'equal':82 'estim':138 'exact':169,191 'exampl':219 'exchang':133 'export':118 'feed':132 'financ':129 'found':222 'four':111 'function':170 'gas':137 'gate':46 'generat':145 'geocod':142 'header':95 'host':36 'infrastructur':140 'inlin':89 'insight':119 'key':16,33,98 'learn':122 'limit':102 'list':60,149 'live':181 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'made':88 'map':161 'metric':115 'micropayment API' 'name':166 'network':54 'no-api-key' 'openapi':214 'particular':155 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request':40 'payment':86,94,195,208 'per':3,20,42,84,152 'platform':107 'post':198 'post-method' 'premium':62,172 'price':131 'protocol':50 'quot':136 'rate':101,134 'report':116 'request':43,85,199 'requir':17,34,104 'respons':220 'return':183 'schema':215 'scheme':190 'second':212 'sentiment':123 'settl':200 'specif':56 'summar':126 'text':125 'timeout':209 'token':135 'unit':72 'usdc':14,31,74,202 'usdc-settlement' 'util':141 'valid':143,185 'version':188 'via':9,26,90 'web3':130 'without':194 'x':93 'x-payment':92 'x402':10,27,49,186 'x402 API' 'x402-payment'","prices":[{"id":"7d916ba0-4312-4036-9cb3-2549696e3eb2","listingId":"f5194471-0393-4efa-9762-b904ae328752","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/keys/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.521Z"}],"sources":[{"listingId":"f5194471-0393-4efa-9762-b904ae328752","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.521Z","lastSeenAt":"2026-04-22T01:02:18.867Z"}],"details":{"listingId":"f5194471-0393-4efa-9762-b904ae328752","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/76 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/76"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/76"},{"claim":"All listed endpoints cost $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"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic access without subscription commitments or rate limits"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with Base USDC wallets needing on-demand endpoints","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.637Z"},"updatedAt":"2026-04-22T01:02:18.867Z"}}