{"id":"ded18e39-4cff-4b07-af56-0aef3d7560e7","shortId":"tLzWSv","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/279` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises categories including: 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 (geocoding, validation, conversion, generation). However, documentation pages beyond the landing page are gated behind a wallet connection, so detailed request/response schemas for individual endpoints are not available from the crawl. The actual functionality behind this specific `/transactions/279` endpoint is unclear — the description is generic (\"Premium API Access\") and does not specify what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai-ml","data"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["The specific functionality of /api/v1/transactions/279 is not documented — 'Premium API Access' is a generic label with no detail on what data or service is returned.","All documentation pages (/docs, /api, /pricing, /README) are gated behind wallet connection and returned no useful content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many endpoint categories (AI, finance, analytics, utilities) but none could be verified for actual functionality from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/279","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/transactions/279","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation accessible without wallet connection, no request/response examples, and the specific purpose of /api/v1/transactions/279 is entirely unclear beyond the generic label 'Premium API Access'. This is effectively a stub listing.","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":"2026-04-19T12:50:51.211Z","embedding":[-0.034973145,-0.037719727,0.04977417,0.021972656,0.008369446,-0.022338867,-0.025665283,0.03149414,0.06951904,-0.06817627,0.029434204,-0.036224365,-0.037506104,-0.038360596,-0.019470215,0.012687683,-0.0043144226,0.006877899,-0.044281006,0.036254883,0.022415161,-0.016830444,-0.029144287,0.016204834,-0.00085401535,-0.005428314,-0.0057258606,0.00046372414,-0.019500732,-0.04559326,0.047424316,-0.022506714,-0.0090408325,0.012306213,-0.014450073,-0.007801056,0.0007338524,0.036895752,0.024597168,-0.00774765,0.002275467,-0.06732178,-0.00074243546,-0.014076233,-0.057281494,0.003944397,0.0024814606,-0.028366089,0.006641388,0.0059432983,-0.036132812,-0.010421753,-0.015396118,0.0011472702,0.008361816,0.0052757263,-0.00068473816,0.004673004,0.013587952,0.0077934265,-0.022781372,-0.06201172,-0.012245178,-0.008529663,-0.0021018982,0.06567383,-0.011070251,0.044952393,0.008758545,0.058166504,0.025512695,0.04876709,0.036834717,0.026184082,0.0062332153,0.0033416748,-0.002494812,0.06262207,-0.016708374,-0.034088135,0.0012702942,-0.025238037,-0.05529785,-0.0055732727,-0.0043029785,-0.047729492,-0.013092041,0.022354126,-0.024749756,0.0345459,-0.07080078,-0.0030727386,-0.007499695,0.003932953,0.011711121,-0.021743774,-0.0141067505,0.013626099,-0.008995056,0.01687622,0.0032043457,-0.040130615,0.02407837,0.015129089,0.03643799,0.046020508,0.02104187,0.026428223,0.009590149,-0.0045318604,-0.02407837,0.0178833,0.0016078949,-0.011665344,0.0234375,0.0007247925,-0.009162903,0.026031494,-0.028533936,0.028533936,-0.036895752,0.0513916,-0.000992775,-0.0037899017,-0.006298065,-0.047912598,-0.0104599,0.01600647,-0.028045654,-0.0027542114,0.013687134,0.018859863,0.030212402,-0.015266418,-0.024383545,0.004196167,-0.014274597,-0.007598877,-0.049987793,-0.04345703,0.04232788,-0.030044556,0.026977539,0.041534424,-0.10089111,-0.0053596497,-0.05355835,0.0021629333,-0.0317688,-0.018798828,-0.0018234253,0.01638794,-0.018753052,-0.008583069,-0.02192688,-0.03366089,-0.0035629272,0.041992188,-0.02003479,0.044281006,-0.034301758,0.025772095,0.011688232,0.020126343,0.02986145,0.026870728,-0.0073509216,-0.0758667,-0.081848145,-0.015388489,0.0052948,-0.02418518,-0.04095459,0.011306763,-0.015625,-0.08880615,-0.021102905,-0.020095825,-0.004753113,-0.040161133,-0.006866455,-0.04006958,0.017807007,-0.019454956,-0.05319214,-0.020462036,-0.03503418,0.064819336,0.023345947,0.020614624,0.02897644,-0.010658264,0.05496216,0.03878784,-0.011207581,-0.012237549,0.00605011,-0.021911621,0.019332886,-0.008300781,0.016311646,-0.035949707,0.04425049,0.08166504,-0.005836487,-0.03262329,-0.011009216,-0.047454834,-0.037353516,-0.037109375,0.019042969,0.020553589,-0.015777588,0.033966064,-0.031173706,-0.025314331,-0.004550934,0.018127441,0.007118225,0.057373047,0.0154418945,-0.007865906,0.029403687,0.013420105,-0.04537964,0.03491211,0.04421997,0.009300232,-0.028213501,-0.041229248,0.036468506,0.047912598,-0.028793335,0.012840271,-0.014572144,0.032836914,-0.006866455,0.0054740906,0.01108551,-0.00868988,-0.031677246,-0.02645874,-0.018112183,0.029724121,0.011894226,-0.023223877,-0.03262329,-0.080566406,0.03741455,0.047729492,0.033599854,-0.010444641,0.0023174286,-0.025344849,-0.007259369,-0.06738281,0.062347412,0.06829834,-0.0024852753,0.004032135,0.038269043,-0.0073928833,-0.0390625,0.0016088486,-0.022979736,-0.025436401,-0.011985779,0.015289307,-0.036468506,-0.00039625168,0.018539429,0.0104599,0.050720215,-0.01802063,-0.046020508,-0.025131226,-0.00944519,0.0066375732,-0.02470398,-0.012893677,-0.0030593872,0.019607544,0.02166748,0.0005378723,0.016357422,0.0006546974,0.0067253113,-0.0090789795,0.012268066,-0.012046814,-0.028503418,0.0064697266,-0.0029182434,-0.060577393,0.005783081,-0.0037460327,0.061645508,-0.04623413,0.03753662,-0.019500732,0.0048713684,0.057922363,-0.010818481,-0.042266846,0.006099701,0.032226562,0.025741577,0.037384033,0.02281189,-0.032714844,-0.012016296,0.07849121,0.00064754486,-0.0067443848,0.011016846,0.0070724487,0.036865234,-0.014663696,-0.049835205,-0.028823853,0.0006136894,-0.03161621,0.023635864,-0.014038086,0.033050537,-0.02204895,-0.00242424,-0.02067566,-0.008666992,-0.030456543,0.01411438,-0.012641907,0.01197052,-0.025802612,-0.026016235,0.020462036,0.0018663406,-0.016723633,0.0039596558,0.04925537,0.016921997,-0.008659363,-0.028961182,-0.039978027,-0.008056641,0.0028495789,0.025894165,0.017593384,0.022567749,0.047851562,-0.038269043,-0.0068588257,0.009750366,0.013336182,0.035308838,-0.007843018,0.008087158,-0.05859375,-0.04067993,-0.018157959,-0.03866577,0.02633667,0.021972656,-0.006225586,0.059570312,0.016494751,-0.034484863,-0.031921387,0.013389587,-0.05090332,0.004463196,0.042297363,-0.008125305,-0.025253296,0.010063171,-0.004043579,0.0013389587,0.037994385,0.028579712,0.025619507,0.068725586,0.03326416,0.004886627,0.021820068,0.000022768974,0.031799316,0.007881165,-0.027252197,-0.040252686,-0.02822876,0.018661499,-0.020050049,-0.01260376,-0.062194824,0.047058105,0.042266846,0.10144043,0.030685425,-0.0016231537,0.03213501,-0.008117676,0.012306213,-0.013633728,-0.03753662,-0.020187378,-0.030181885,0.015182495,-0.0074539185,-0.011276245,-0.022323608,0.024093628,0.00017309189,0.01776123,-0.029815674,0.055389404,-0.015129089,-0.018859863,0.017715454,0.015930176,0.037963867,0.06323242,-0.03668213,0.029388428,0.022155762,-0.041046143,0.00617218,0.043670654,-0.009117126,-0.009536743,-0.038146973,-0.012016296,-0.0038204193,-0.017074585,-0.042541504,0.000518322,0.006072998,0.032196045,0.025344849,-0.014305115,-0.014961243,-0.009590149,-0.010231018,-0.046905518,0.00207901,-0.033447266,0.0029792786,0.051879883,-0.028686523,0.0055274963,-0.00053691864,0.005176544,-0.006225586,0.0066337585,0.02507019,-0.0077590942,-0.04473877,0.044769287,-0.00592041,0.020599365,0.009315491,0.019332886,0.030212402,0.036987305,0.044830322,0.012367249,-0.009841919,-0.06323242,0.010894775,-0.044708252,0.004016876,0.030960083,-0.022598267,-0.00084495544,-0.009162903,-0.03729248,-0.023605347,0.016860962,-0.033233643,0.003742218,0.0134887695,-0.027038574,-0.030044556,-0.061706543,-0.01084137,-0.0088272095,0.051971436,0.025177002,0.013954163,-0.06854248,-0.0019445419,0.030258179,0.00869751,0.026062012,-0.0154800415,0.00078105927,-0.017349243,-0.038085938,-0.01878357,-0.015853882,0.026062012,0.0002465248,-0.0044898987,0.023498535,0.00031137466,0.013954163,0.012672424,0.0037994385,0.02078247,-0.02861023,-0.007133484,-0.0058555603,0.036712646,0.016952515,-0.019180298,-0.046569824,0.039764404,0.002822876,0.03543091,-0.040618896,-0.011009216,-0.009719849,0.015289307,0.015281677,-0.015808105,-0.010482788,-0.020553589,-0.042144775,-0.07714844,0.03793335,-0.021102905,0.034088135,0.022476196,0.003616333,0.0234375,-0.013320923,0.0020503998,0.01737976,-0.023498535,-0.01071167,-0.023544312,-0.040222168,-0.024276733,-0.017318726,-0.025756836,0.017486572,-0.021972656,0.018722534,0.003250122,-0.02192688,0.023971558,-0.00063180923,0.0010986328,0.00983429,0.0028877258,0.02218628,0.033966064,0.020248413,-0.044891357,0.018188477,-0.001420021,-0.0012207031,-0.006668091,0.04815674,0.02293396,-0.009506226,-0.005279541,-0.007259369,-0.01928711,-0.023971558,0.0007843971,-0.0017261505,-0.0030918121,0.0020256042,-0.029922485,0.018981934,-0.0020885468,-0.03866577,-0.026275635,0.02255249,0.004180908,-0.03857422,0.027832031,0.04156494,0.049346924,-0.016998291,0.0052108765,-0.0009851456,0.048858643,0.036224365,0.0050201416,-0.013069153,0.03326416,-0.015975952,0.02746582,-0.006164551,-0.00969696,0.011047363,0.004634857,0.027648926,0.022201538,0.0041236877,-0.023651123,-0.037994385,-0.005207062,-0.0054359436,-0.027038574,0.020507812,0.01260376,0.032073975,-0.018356323,0.02381897,0.007534027,-0.012321472,-0.01826477,-0.009414673,0.038238525,-0.008560181,-0.016952515,0.0087890625,0.013046265,0.02986145,-0.061798096,-0.008583069,0.005142212,0.010726929,-0.013038635,-0.043548584,-0.03475952,0.008087158,0.034240723,0.007419586,0.021911621,0.031280518,-0.0021324158,0.0008482933,0.030929565,-0.014587402,-0.0062561035,-0.0052871704,-0.05343628,-0.023330688,-0.0066452026,0.0060195923,-0.04156494,0.017166138,-0.009857178,-0.021530151,0.008285522,-0.020263672,0.0008649826,-0.024490356,0.0063819885,0.039855957,0.0032310486,0.014266968,-0.02204895,-0.029922485,-0.004901886,0.015640259,0.018447876,-0.043029785,0.025299072,-0.013267517,-0.00422287,0.0039863586,0.018463135,0.024887085,0.015159607,0.011070251,0.0418396,-0.04751587,0.052612305,-0.020996094,0.02166748,-0.0032291412,-0.032470703,-0.010269165,-0.015106201,-0.012176514,0.046569824,-0.017349243,-0.009292603,-0.035888672,-0.027374268,-0.0034484863,-0.057159424,0.01184082,0.031066895,0.03881836,-0.019317627,0.0013771057,0.0028762817,0.013717651,-0.0154953,0.012557983,-0.026046753,0.016845703,0.02961731,-0.008728027,-0.026824951,-0.025161743,-0.018081665,-0.015342712,-0.05303955,-0.05899048,-0.009841919,0.015052795,-0.0077934265,-0.005596161,-0.029190063,-0.020980835,-0.009857178,-0.042785645,0.017288208,-0.003982544,0.016799927,0.0017232895,-0.025650024,0.00041675568,0.015037537,-0.0062789917,0.02911377,0.012512207,0.0035686493,-0.042175293,0.017807007,0.009063721,0.026382446,0.0018548965,-0.02268982,-0.0063323975,-0.029006958,-0.04852295,-0.01084137,-0.011688232,-0.011665344,-0.009857178,0.0033817291,-0.056671143,-0.0016069412,-0.026519775,-0.009880066,0.019485474,0.00061130524,0.023605347,0.0010375977,0.020233154,-0.008049011,-0.008369446,-0.03564453,0.015396118,0.011207581,0.008773804,0.019332886,0.05822754,-0.007904053,-0.024154663,0.0001680851,-0.0014286041,0.013313293,-0.020767212,0.012489319,-0.014198303,0.019958496,-0.011138916,-0.014060974,-0.039276123,-0.009269714,0.082214355,-0.0026569366,-0.023269653,-0.010810852,-0.010169983,0.014755249,0.037017822,-0.03164673,-0.009025574,-0.014877319,0.026016235,-0.015129089,0.0085372925,-0.0006737709,0.020065308,-0.024093628,-0.05065918,-0.016433716,-0.0075531006,-0.020431519,-0.066345215,-0.027908325,-0.059448242,0.009063721,-0.013420105,-0.02772522,0.0028190613,0.012168884,-0.016052246,-0.09429932,0.0042304993,0.051116943,0.0067825317,0.036865234,-0.013435364,0.010971069,0.034698486,-0.035949707,-0.0060539246,0.02067566,-0.029144287,-0.016113281,-0.020355225,0.018981934,-0.013557434,-0.015548706,0.0032348633,0.0035419464,0.024124146,0.0034389496,0.0110321045,-0.018966675,0.022521973,-0.015670776,0.021240234,-0.017364502,-0.010215759,0.03439331,-0.04989624,0.031341553,0.008903503,-0.00724411,0.00724411,0.039855957,0.040283203,-0.04031372,-0.0124435425,0.0101623535,0.0024108887,0.035705566,-0.021118164,0.044403076,0.015106201,-0.01209259,0.02458191,-0.013427734,-0.012458801,-0.020141602,-0.017868042,0.018478394,-0.0055160522,0.011985779,-0.03010559,-0.0011558533,0.01914978,0.005126953,0.011505127,-0.005760193,-0.01979065,-0.038482666,0.005001068,0.0082092285,-0.00065755844,0.0025939941,0.025878906,0.021835327,0.0395813,0.015586853,-0.017227173,-0.00013494492,0.031036377,-0.015304565,-0.003545761,0.02519226,0.0036888123,0.0057411194,0.020141602,0.015014648,-0.055145264,-0.012672424,-0.020507812,-0.023345947,-0.0073242188,-0.007045746,-0.02281189,-0.003982544,0.0009765625,-0.0069999695,-0.037231445,-0.0029296875,-0.025024414,-0.034362793,0.002691269,-0.018936157,0.026870728,0.004558563,0.012763977,0.004016876,-0.0024204254,0.038513184,0.0021400452,-0.01966858,0.0345459,0.03378296,0.01828003,-0.029541016,-0.006816864,-0.017990112,-0.009689331,-0.004863739,-0.030456543,0.004714966,0.032562256,-0.016525269,-0.0003504753,0.005428314,0.023223877,-0.0056648254,0.004070282,-0.008354187,0.016418457,-0.018630981,0.045410156,-0.046783447,0.029434204,0.01374054,0.0040359497,-0.014854431,-0.019927979,-0.039794922,0.023635864,-0.0002810955,-0.0012569427,0.046966553,0.010681152,0.03564453,-0.0181427,-0.022232056,0.0061798096,-0.029815674,-0.01878357,0.027511597,-0.0158844,0.0020694733,0.019714355,-0.027008057,0.03050232,-0.037597656,0.011749268,-0.0036830902,-0.0047798157,-0.009819031,-0.0073394775,-0.013969421,-0.009307861,-0.020889282,0.0069732666,-0.004989624,0.046783447,0.028076172,0.035827637,0.042633057,0.018432617,0.008979797,-0.035705566,-0.03201294,0.008773804,-0.022018433,0.021606445,-0.018615723,0.04248047,0.038848877,-0.0005865097,0.03930664,0.028442383,0.036102295,0.0032310486,0.014129639,-0.02218628,0.017593384,-0.01525116,0.023223877,-0.004348755,0.041137695,-0.025115967,0.017791748,0.018234253,0.019683838,-0.020843506,0.033477783,0.07867432,0.021011353,-0.011123657,0.04675293,0.00027775764,-0.008636475,-0.003435135,-0.025909424,0.045715332,0.008079529,0.0446167,0.04901123,0.018966675,-0.0015382767,0.03427124,-0.02911377,-0.024414062,0.05545044,0.02885437,-0.019378662,-0.011146545,-0.013442993,0.008842468,-0.048553467,-0.023239136,0.022903442,-0.015686035,0.010383606,-0.0077590942,-0.007659912,-0.008911133,0.011276245,0.023757935,0.02027893,-0.0019817352,0.025848389,0.034362793,-0.001074791,0.0184021,-0.00096178055,0.024642944,-0.020706177,-0.020492554,0.020874023,0.024169922,-0.017745972,-0.010414124,0.0259552,0.004787445,0.041137695,0.04083252,-0.024658203,0.011054993,0.028427124,0.009284973,-0.004180908,0.047210693,0.04260254,0.021209717,0.040496826,0.029968262,0.033294678,-0.029190063,0.016738892,-0.0069732666,-0.0025939941,-0.013458252,0.0026512146,0.0031604767,-0.010284424,0.02999878,0.001783371,-0.013259888,0.021987915,0.024551392,-0.0020885468,-0.011634827,-0.0042037964,0.01171875,-0.025115967,-0.0026760101,0.008766174,-0.016616821,0.032836914,0.0058937073,0.016830444,-0.028686523,0.02180481,0.0015678406,-0.02130127,-0.0014314651,0.02885437,-0.046325684,0.005142212,-0.008224487,0.001657486,-0.05038452,0.0041236877,0.021591187,-0.0024032593,0.023742676,0.011375427,-0.0037937164,-0.006778717,0.027191162,0.012306213,-0.0074806213,-0.013893127,-0.025436401,0.024490356,0.044403076,0.0042152405,0.010040283,-0.019317627,-0.00831604,0.0024433136,-0.0065727234,-0.004966736,-0.0055007935,-0.011306763,-0.023406982,0.02458191,0.036895752,0.014640808,0.049713135,-0.009567261,-0.010787964,0.0146102905,0.03955078,0.0023765564,-0.00919342,-0.0025043488,0.01737976,-0.017440796,0.05303955,0.042999268,0.0020923615,0.035339355,-0.003282547,-0.017501831,0.008087158,-0.012130737,0.027648926,-0.010658264,0.002231598,0.0056381226,0.031463623,-0.016418457,-0.025741577,-0.0001232624,-0.020019531,-0.020492554,-0.014854431,0.0074386597,-0.002445221,0.028366089,0.039978027,0.023757935,-0.016357422,0.060302734,-0.008514404,0.042633057,0.0034389496,-0.014945984,0.048187256,0.018997192,0.041900635,0.015991211,0.012374878,-0.036224365,0.023651123,0.02268982,0.022109985,0.012458801,0.0073051453,-0.010818481,0.030136108,-0.0063934326,0.039794922,-0.008651733,0.005027771,0.017715454,-0.0044670105,-0.0073051453,-0.0050811768,-0.0016374588,0.009239197,0.044921875,-0.037353516,-0.0034561157,-0.027374268,-0.01285553,0.025665283,-0.010757446,0.000223279,-0.0065307617,-0.018676758,0.021499634,-0.026901245,-0.017913818,0.015182495,0.025802612,-0.0501709,-0.016296387,0.009628296,0.022003174,-0.020080566,0.029281616,0.022125244,-0.0022449493,0.0040779114,0.04837036,-0.007411957,0.027801514,-0.011505127,0.029434204,0.030075073,0.011146545,-0.018753052,0.0029125214,0.004627228,-0.011657715,0.013893127,0.03555298,-0.028213501,-0.000039994717,-0.0090408325,-0.011047363,-0.0077209473,0.009147644,-0.010665894,0.009963989,-0.008911133,-0.008926392,0.010177612,0.0063323975,-0.00504303,0.0039634705,0.0062789917,-0.01576233,0.013580322,0.029083252,0.018600464,-0.034118652,-0.008033752,0.0011949539,0.0050697327,-0.0206604,-0.010231018,-0.0093307495,-0.035369873,0.0031318665,0.0074920654,0.0121536255,0.009185791,-0.032073975,-0.0032424927,0.022369385,0.0038166046,0.010101318,0.0078048706,-0.00081443787,0.016738892,-0.007358551,-0.0016307831,-0.011108398,-0.002286911,0.016601562,0.014587402,-0.01725769,-0.026351929,0.018005371,-0.006008148,0.017913818,0.0069389343,-0.008110046,0.020706177,-0.014434814,-0.0036525726,-0.0044784546,0.018920898,-0.015586853,-0.0049552917,-0.011779785,0.020553589,0.04864502,-0.009437561,-0.0075645447,0.024780273,0.014518738,0.018493652,0.03604126,0.008110046,0.036987305,0.023529053,-0.017959595,-0.013298035,0.023406982,-0.003780365,-0.031799316,0.016830444,-0.0013151169,-0.019241333,0.02583313,0.017120361,0.002193451,-0.03390503,-0.008987427,-0.007774353,-0.016189575,0.013717651,-0.01651001,0.011444092,-0.02684021,-0.0135269165,0.012542725,-0.028442383,-0.0418396,-0.016723633,0.0029010773,-0.017196655,-0.04876709,-0.005317688,-0.023605347,0.0059165955,-0.0259552,-0.00096845627,-0.0044517517,0.015640259,-0.011291504,-0.018096924,-0.0045318604,0.028686523,0.023406982,0.013504028,0.02041626,-0.019897461,-0.017150879,-0.03717041,0.003829956,-0.014450073,0.021575928,0.00067806244,0.027999878,0.023834229,-0.01852417,-0.0002090931,-0.010345459,-0.0056533813,-0.016830444,-0.019500732,-0.015182495,0.024291992,0.015464783,-0.008331299,-0.0071640015,0.04623413,-0.023590088,-0.018341064,0.03262329,0.044952393,-0.0035362244,0.039031982,-0.02128601,0.0030097961,-0.011940002,0.0028572083,-0.01474762,-0.0031642914,0.010871887,0.0079422,0.0074386597,0.009521484,0.021728516,-0.015357971,-0.0004940033,0.030929565,0.004650116,-0.006587982,0.041870117,0.0043525696,0.0021839142,-0.019165039,-0.0025844574,0.017166138,0.03793335,0.017578125,0.0059928894,-0.023269653,0.0003504753,-0.016723633,0.014144897,0.019317627,-0.020584106,-0.050476074,-0.01260376,-0.029571533,0.024963379,-0.0011396408,0.013038635,-0.009475708,0.019226074,-0.020935059,-0.024276733,-0.031585693,0.032196045,0.018432617,-0.016311646,-0.013839722,0.011016846,0.021392822,-0.035827637,-0.00028562546,-0.041931152,-0.030715942,-0.009017944,-0.016311646,0.02468872,0.0035629272,-0.003074646,0.0015907288,-0.0077590942,-0.0033130646,0.0013456345,0.016357422,-0.02130127,-0.007949829,0.027267456,0.020339966,-0.021331787,0.035186768,-0.013023376,0.004699707,0.013717651,-0.0049209595,0.018737793,-0.02368164,0.02494812,0.00063562393,-0.005168915,0.036315918,-0.008140564,0.010559082,-0.03289795,-0.005859375,0.0019989014,-0.00548172,0.04611206,-0.016021729,-0.019042969,0.010002136,-0.025131226,-0.02810669,0.0049209595,0.016326904,0.019836426,-0.00017273426,0.05380249,-0.009376526,-0.018005371,0.02432251,0.014076233,-0.021377563,-0.0065231323,0.030288696,0.0033359528,0.0069999695,-0.0020923615,-0.011177063,-0.025436401,-0.0013103485,0.023269653,-0.0053596497,-0.014251709,0.02986145,0.019226074,0.046691895,-0.01234436,0.029327393,0.021850586,0.006702423,0.027786255,-0.0007762909,0.051452637,-0.0068092346,-0.033050537,0.0028686523,-0.00031900406,-0.03302002,0.01171875,-0.00026845932,-0.0013380051,-0.04019165,0.009216309,0.0077056885,0.02897644,-0.014518738,0.012969971,-0.025512695,-0.018157959,-0.03353882,-0.0049705505,-0.026306152,0.0069236755,0.04119873,0.011749268,0.032470703,-0.0008416176,-0.023345947,0.018127441,0.043029785,0.005340576,-0.021209717,-0.015022278,0.008796692,0.009651184,0.01109314,0.0042419434,-0.018981934,-0.011016846,-0.0022525787,-0.011604309,0.013580322,-0.0018482208,0.015090942,0.009727478,-0.0069732666,-0.012512207,0.037109375,-0.0033359528,-0.0076408386,0.0076789856,0.002943039,0.036071777,0.025238037,-0.011199951,0.01828003,0.015159607,-0.046142578,0.06756592,-0.003660202,0.023406982,-0.012741089,0.0107803345,-0.037261963,-0.02935791,-0.0113220215,0.004135132],"createdAt":"2026-04-18T18:59:52.216Z","updatedAt":"2026-04-23T14:31:34.883Z","lastSeenAt":"2026-04-23T14:31:34.883Z","tsv":"'/api/v1/transactions/279':96 '/request':13,28 '/transactions/279':217 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':136 '402':106 '6':127 'Base network API' 'USDC API' 'accept':141 'access':102,227 'actual':212 'advertis':150 'ai':160 'ai/ml':49 'analysi':164 'analyt':48,154 'api':5,20,37,74,101,226 'application/json':146 'attach':84 'avail':207 'base':8,23,71,113,120 'base-network' 'behind':194,214 'beyond':188 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':151 'challeng':107 'classif':167 'connect':197 'convers':183 'crawl':210 'crypto-paid API' 'data':47,52,153,157,233 'decim':128 'descript':222 'detail':199 'document':186 'embed':168 'enabl':36 'endpoint':45,57,94,140,204,218 'equal':122 'estim':178 'exact':133 'exchang':173 'export':158 'feed':172 'financ':169 'finance/web3':51 'function':213 'gas':177 'gate':193 'generat':184 'generic':224 'geocod':181 'given':124 'header':88 'howev':185 'includ':152 'individu':203 'infer':50 'infrastructur':180 'insight':159 'json-response' 'key':75 'land':190 'learn':162 'limit':77 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':161 'metric':155 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'page':187,191 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'post-method' 'premium':100,225 'price':171 'provid':237 'quot':176 'rate':76,174 'report':156 'request':62,91,108,143 'request/response':200 'requir':81 'return':104,145 'schema':201 'scheme':131 'second':137 'sentiment':163 'servic':55,235 'settl':66 'simpli':83 'span':46 'specif':93,216 'specifi':231 'subscript':79 'summar':166 'text':165 'timeout':138 'token':175 'unclear':220 'unit':114 'usdc':15,30,68,116,125 'usdc-settlement' 'util':54 'valid':182 'via':10,25 'wallet':196 'web3':170 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0efbebf0-d8e8-47fd-8cf6-058e9854d1f4","listingId":"ded18e39-4cff-4b07-af56-0aef3d7560e7","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/transactions/279","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:52.216Z"}],"sources":[{"listingId":"ded18e39-4cff-4b07-af56-0aef3d7560e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/279","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:52.216Z","lastSeenAt":"2026-04-23T14:31:34.883Z"}],"details":{"listingId":"ded18e39-4cff-4b07-af56-0aef3d7560e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/279 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in 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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/279"},{"claim":"Payment scheme is 'exact' with 300-second timeout, endpoint accepts POST and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/transactions/279"}],"useCases":["Accessing data analytics and reports on a per-request basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching financial data like exchange rates, token quotes, and gas estimates via crypto micropayments","Using utility services like geocoding and validation without API key management"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","Agents and bots that can settle payments in USDC on Base via x402","Projects needing quick API access without signup or key provisioning"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.065Z"},"updatedAt":"2026-04-23T14:31:34.883Z"}}