{"id":"e7b73835-57aa-4fcf-ab0a-6f327360bc0a","shortId":"x2VTnU","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transactions/123` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to pay and receive a response.\n\nThe platform organizes its endpoints into 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 listed endpoints share the same $0.02/request pricing. The x402 challenge specifies the \"exact\" payment scheme, a 300-second timeout, and targets the USDC contract on Base (0x8335…2913).\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific behavior of the `/api/v1/transactions/123` endpoint — what input it expects and what data it returns — is not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all blank beyond a 'Connect wallet' prompt — no usable technical docs exist","The specific endpoint /api/v1/transactions/123 is not listed among the catalog endpoints on the homepage; its purpose and expected input/output are unknown","No OpenAPI spec, request schema, or response schema is available","No examples of successful responses are documented anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/123","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/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet' with no schemas, examples, or descriptions of what the endpoint actually does. The specific purpose of /api/v1/transactions/123 is unclear beyond the label 'Premium API Access'. No OpenAPI spec is available.","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":"2026-04-19T12:04:50.977Z","embedding":[-0.030670166,-0.0284729,0.044769287,0.011360168,0.008262634,-0.02468872,-0.023971558,0.019485474,0.06756592,-0.05987549,0.026779175,-0.057434082,-0.025634766,-0.0423584,-0.010643005,0.020965576,-0.0009908676,0.010299683,-0.037109375,0.030883789,0.023468018,-0.022949219,-0.03161621,0.018356323,-0.0074310303,-0.0206604,-0.0012369156,-0.002696991,-0.033447266,-0.04156494,0.051330566,-0.027435303,-0.006324768,-0.004512787,-0.002626419,-0.0047721863,-0.0016727448,0.032928467,0.029785156,-0.0018148422,-0.003282547,-0.061706543,0.008476257,-0.021865845,-0.05380249,-0.010253906,0.017532349,-0.020706177,0.009986877,0.001159668,-0.044189453,-0.001783371,-0.017471313,0.024246216,-0.0006699562,0.0062675476,-0.010421753,-0.008865356,0.018463135,0.003124237,-0.008110046,-0.050598145,-0.021331787,-0.007247925,-0.0025177002,0.059631348,-0.012161255,0.049346924,0.0018815994,0.066833496,0.031951904,0.03930664,0.027420044,0.015960693,0.017059326,-0.0063285828,-0.014389038,0.05999756,-0.009757996,-0.024368286,0.0017995834,-0.020553589,-0.059661865,-0.011856079,-0.016220093,-0.04232788,-0.015808105,0.025909424,-0.02961731,0.028930664,-0.07281494,-0.005882263,-0.00617218,0.0019931793,0.0015563965,-0.014198303,-0.004890442,0.011352539,-0.009506226,0.01651001,-0.0079193115,-0.051483154,0.020812988,0.01512146,0.04550171,0.046081543,0.014930725,0.015899658,0.0047721863,-0.012718201,-0.043273926,0.013397217,-0.0053100586,-0.015930176,0.003665924,0.011047363,-0.01838684,0.011680603,-0.023147583,0.011024475,-0.046447754,0.051849365,0.0052223206,0.009178162,-0.00071525574,-0.055908203,-0.016952515,0.011154175,-0.039276123,-0.013122559,0.012817383,0.014320374,0.026535034,-0.021697998,-0.027893066,0.012001038,-0.014450073,0.0087890625,-0.042297363,-0.02999878,0.031311035,-0.026809692,0.010879517,0.0552063,-0.09753418,-0.018127441,-0.040161133,0.0025024414,-0.029754639,-0.013191223,0.010108948,0.026657104,-0.01876831,-0.016433716,-0.017669678,-0.024475098,-0.004299164,0.037994385,-0.014533997,0.028823853,-0.022964478,0.025466919,0.014877319,0.00059461594,0.0069351196,0.029434204,-0.006866455,-0.08691406,-0.07861328,-0.023361206,0.0025997162,-0.03427124,-0.032562256,-0.00041913986,-0.013298035,-0.06774902,-0.018615723,-0.0024776459,0.0056915283,-0.047729492,-0.010177612,-0.028030396,0.018692017,-0.008468628,-0.04748535,-0.028213501,-0.029754639,0.060791016,0.02357483,0.027175903,0.0259552,0.005996704,0.057800293,0.021484375,-0.008987427,-0.018920898,0.017868042,-0.025787354,0.029830933,0.0016956329,0.017654419,-0.02456665,0.03479004,0.072753906,-0.00023829937,-0.033416748,-0.0126953125,-0.05569458,-0.051452637,-0.03237915,0.02671814,0.010116577,-0.0018634796,0.04107666,-0.039215088,-0.03353882,-0.007259369,0.01260376,0.0184021,0.05984497,0.017105103,0.001045227,0.027435303,0.012672424,-0.04458618,0.038269043,0.034423828,0.006214142,-0.021362305,-0.039001465,0.038635254,0.042877197,-0.020706177,0.015289307,-0.006755829,0.036254883,-0.0016756058,0.0037956238,0.010345459,-0.0070114136,-0.023330688,-0.011367798,-0.021347046,0.020812988,0.01146698,-0.021911621,-0.030853271,-0.07989502,0.05218506,0.039276123,0.036621094,-0.016540527,-0.00040626526,-0.024017334,-0.018722534,-0.07678223,0.061920166,0.071899414,0.007045746,-0.0051116943,0.020080566,0.0055351257,-0.034606934,0.0105896,-0.021224976,-0.0289917,-0.019744873,0.0077590942,-0.05255127,-0.0076141357,0.02331543,0.0209198,0.056915283,-0.009849548,-0.048583984,-0.024383545,-0.006126404,0.0011978149,-0.035583496,0.00630188,-0.002500534,0.017700195,0.023880005,0.007171631,0.014503479,0.01474762,0.0043144226,-0.007801056,0.008049011,-0.01612854,-0.028686523,0.0135269165,-0.0015773773,-0.053253174,0.01109314,-0.009353638,0.062561035,-0.035003662,0.038482666,-0.014930725,0.0034732819,0.04510498,-0.0022277832,-0.046661377,0.011390686,0.03326416,0.016601562,0.042114258,0.012763977,-0.030319214,-0.008033752,0.08154297,-0.0039024353,-0.0023479462,0.010093689,0.0045166016,0.04196167,-0.009483337,-0.057006836,-0.044769287,-0.00061941147,-0.03555298,0.030471802,-0.0043563843,0.030960083,-0.0070266724,0.0031051636,-0.017425537,0.0043792725,-0.034973145,0.010772705,-0.02178955,0.0033550262,-0.015945435,-0.0317688,0.004055023,0.01525116,-0.005332947,0.00995636,0.05105591,0.01197052,-0.012077332,-0.031280518,-0.035888672,-0.0068855286,-0.017288208,0.013442993,0.02720642,0.024246216,0.055999756,-0.028717041,-0.0010175705,0.02130127,0.019500732,0.03050232,-0.001405716,-0.0072135925,-0.07067871,-0.04220581,-0.029312134,-0.0446167,0.023010254,0.021881104,-0.008468628,0.05706787,0.012924194,-0.02520752,-0.03060913,0.020446777,-0.05154419,-0.0054397583,0.0317688,-0.015052795,-0.033203125,-0.003200531,-0.007858276,-0.0032196045,0.040222168,0.023651123,0.03262329,0.063964844,0.03277588,0.009788513,0.035888672,0.0053749084,0.038360596,0.016983032,-0.020935059,-0.02607727,-0.022537231,0.0335083,-0.01852417,-0.027389526,-0.062347412,0.07232666,0.03656006,0.07879639,0.00819397,0.011306763,0.030349731,-0.0035972595,0.004711151,-0.021469116,-0.0184021,-0.019622803,-0.03756714,0.036621094,-0.013168335,-0.009254456,-0.017745972,0.04168701,-0.0058937073,0.014053345,-0.02053833,0.035614014,-0.024429321,-0.010940552,0.017715454,0.0053634644,0.056427002,0.060913086,-0.05078125,0.020202637,0.017074585,-0.045410156,0.017501831,0.04586792,-0.008834839,-0.0074386597,-0.048217773,-0.01914978,-0.0022659302,-0.0059127808,-0.041015625,0.010093689,0.012382507,0.021987915,0.03488159,-0.007698059,-0.015266418,-0.0045051575,-0.017608643,-0.053771973,0.0072669983,-0.03894043,0.0037403107,0.03741455,-0.030258179,0.0009551048,-0.0043945312,-0.011749268,-0.006198883,0.010444641,0.034179688,0.0013809204,-0.049621582,0.04321289,0.003932953,0.02078247,0.01234436,0.0357666,0.025115967,0.028259277,0.051361084,0.003414154,-0.017028809,-0.06488037,0.021728516,-0.051361084,0.002483368,0.022277832,-0.024673462,0.000054001808,-0.0064086914,-0.0357666,-0.023147583,0.015556335,-0.01776123,-0.00044322014,0.011787415,-0.024108887,-0.034301758,-0.064208984,-0.010635376,-0.00029587746,0.060058594,0.016082764,-0.0016508102,-0.055145264,0.0023517609,0.025817871,-0.0009331703,0.038757324,-0.015213013,-0.008323669,-0.0056381226,-0.042297363,-0.0132369995,-0.029815674,0.032318115,-0.0048561096,-0.005619049,0.014427185,0.011077881,0.012924194,0.0023765564,0.0031414032,0.016067505,-0.032196045,-0.0058937073,-0.01260376,0.0335083,0.024765015,-0.014015198,-0.034484863,0.037963867,0.01576233,0.038848877,-0.03479004,-0.00422287,-0.010276794,0.0023288727,0.014144897,-0.015289307,-0.010612488,-0.020050049,-0.049987793,-0.061340332,0.035369873,-0.019104004,0.026626587,0.029785156,0.004585266,0.024337769,-0.027786255,0.010513306,0.013694763,-0.02760315,-0.008323669,-0.028930664,-0.04144287,-0.019836426,-0.007965088,-0.022384644,0.024749756,-0.019210815,0.0076179504,0.0062026978,-0.022323608,0.02986145,0.0048332214,-0.0069389343,0.017532349,0.0030879974,0.027999878,0.03475952,0.011398315,-0.05807495,0.020339966,-0.0064811707,0.012207031,-0.0074310303,0.043304443,0.02949524,-0.011222839,-0.0030670166,-0.00869751,-0.026367188,-0.02017212,0.004840851,0.00333786,0.0063438416,0.0014715195,-0.046569824,0.016601562,-0.0039901733,-0.030929565,-0.036712646,0.014678955,0.011512756,-0.037597656,0.02796936,0.021194458,0.04522705,-0.015991211,0.011001587,0.0059890747,0.042419434,0.046844482,-0.0021705627,-0.0049819946,0.015106201,-0.003786087,0.015991211,-0.015945435,-0.00198555,0.012962341,-0.0046424866,0.015686035,0.025634766,0.011100769,-0.028457642,-0.033813477,-0.001159668,-0.010795593,-0.026321411,0.028900146,0.015449524,0.02432251,-0.02406311,0.0154418945,0.009048462,-0.019836426,-0.014945984,-0.009590149,0.027786255,-0.018295288,-0.01360321,0.016662598,0.0061035156,0.026123047,-0.04598999,-0.0060691833,0.012016296,0.0066070557,-0.025390625,-0.056274414,-0.04269409,0.0014238358,0.041168213,0.0011816025,0.029541016,0.033203125,-0.003522873,0.009811401,0.029724121,-0.0039100647,-0.019348145,-0.008590698,-0.047058105,-0.031402588,-0.0041656494,0.010429382,-0.0357666,0.016677856,-0.006664276,-0.033111572,0.0005636215,-0.019439697,-0.008361816,-0.012168884,0.01991272,0.039733887,0.0046195984,0.022583008,-0.016555786,-0.034088135,-0.009544373,0.009933472,0.017318726,-0.04663086,0.024520874,-0.010307312,-0.020858765,-0.001496315,0.013679504,0.022964478,0.02670288,0.013923645,0.03274536,-0.04812622,0.04815674,-0.028076172,0.02331543,-0.008483887,-0.036987305,-0.019134521,-0.029144287,-0.013206482,0.0368042,-0.025024414,-0.012397766,-0.0368042,-0.037353516,-0.007259369,-0.0619812,0.01953125,0.045562744,0.043548584,-0.017730713,0.0050849915,-0.005176544,0.008338928,-0.012191772,0.0017795563,-0.005970001,0.028793335,0.028640747,0.0038528442,-0.01638794,-0.029418945,-0.034301758,-0.0050964355,-0.054229736,-0.0647583,-0.006717682,0.009864807,-0.010910034,-0.011817932,-0.030685425,-0.04019165,0.0065574646,-0.047698975,0.00774765,-0.005558014,0.016174316,0.011138916,-0.021881104,0.0013275146,0.014945984,-0.014129639,0.039611816,0.0050964355,-0.0076446533,-0.044158936,0.014808655,0.014480591,0.017944336,-0.005596161,-0.021224976,-0.003566742,-0.02017212,-0.045440674,-0.007686615,-0.0058631897,-0.02003479,-0.013717651,0.0018901825,-0.060516357,-0.0013227463,-0.026123047,-0.0017986298,0.024383545,0.018081665,0.008560181,-0.008598328,0.017196655,0.0051002502,-0.0032024384,-0.03265381,0.010406494,0.011222839,0.0036792755,0.02331543,0.05770874,-0.0015573502,-0.033081055,0.013031006,0.005378723,0.017288208,-0.017547607,0.007850647,-0.025543213,0.015464783,-0.010772705,-0.011680603,-0.039245605,-0.0014295578,0.08215332,0.0069618225,-0.011734009,-0.01550293,-0.022201538,0.011543274,0.03060913,-0.033233643,0.0043144226,-0.024597168,0.015357971,-0.023666382,0.011688232,0.00907135,0.027755737,-0.016845703,-0.054534912,-0.010864258,-0.0050697327,-0.0061836243,-0.06964111,-0.027313232,-0.07324219,0.0041046143,-0.008079529,-0.03161621,0.0051994324,0.009353638,-0.0184021,-0.08654785,0.0046958923,0.04949951,0.010246277,0.027389526,-0.010108948,0.02960205,0.027130127,-0.023666382,-0.0031032562,0.02619934,-0.024520874,-0.016525269,-0.023757935,0.020736694,-0.010688782,-0.000008821487,-0.0034294128,0.0031547546,0.014015198,-0.01184845,0.00655365,-0.014518738,0.018188477,-0.017990112,0.014656067,-0.0059814453,-0.013710022,0.038238525,-0.056518555,0.020843506,0.0076408386,-0.010063171,0.00762558,0.04046631,0.040649414,-0.04260254,-0.016479492,0.011665344,0.008056641,0.026977539,-0.012687683,0.05999756,0.013084412,-0.014640808,0.009284973,-0.013641357,-0.0059776306,-0.029785156,-0.028366089,0.019332886,0.007019043,0.00945282,-0.020477295,-0.009124756,0.02911377,-0.0012779236,0.008415222,-0.008308411,-0.016571045,-0.03475952,0.0012226105,0.00605011,0.0071411133,-0.0017213821,0.027069092,0.022705078,0.037322998,0.0025787354,-0.010040283,-0.0026683807,0.0309906,-0.014022827,0.0033988953,0.030426025,0.012420654,0.01247406,0.01838684,0.007873535,-0.049041748,-0.0055618286,-0.02243042,-0.017990112,0.0024585724,-0.010238647,-0.019760132,0.0010919571,-0.00061416626,-0.014854431,-0.02696228,-0.0029563904,-0.031799316,-0.032287598,-0.0037937164,-0.009307861,0.027893066,0.02142334,0.0033016205,0.0070114136,-0.0021972656,0.04269409,-0.0054397583,-0.012413025,0.029037476,0.02407837,0.01676941,-0.034088135,-0.0039405823,-0.013504028,0.0011138916,0.0051002502,-0.033691406,0.015625,0.032592773,-0.020370483,0.004470825,0.0043296814,0.02986145,-0.00957489,0.0030937195,-0.010673523,0.013397217,-0.012046814,0.033203125,-0.058776855,0.027252197,0.01373291,0.008384705,-0.016799927,-0.018051147,-0.019134521,0.02784729,0.000893116,-0.0076408386,0.05444336,0.004901886,0.029891968,-0.021026611,-0.031066895,-0.0037269592,-0.030715942,-0.023513794,0.01335144,-0.02178955,-0.00056791306,0.01360321,-0.02519226,0.023345947,-0.03237915,0.01651001,0.0023097992,-0.0050621033,-0.005268097,-0.014945984,-0.0023975372,-0.0073394775,-0.019866943,-0.0039367676,-0.001698494,0.05407715,0.017349243,0.032226562,0.045562744,0.011940002,0.0042800903,-0.041046143,-0.023361206,-0.00048041344,-0.018920898,0.01777649,-0.014808655,0.046936035,0.041809082,-0.0012664795,0.041900635,0.03793335,0.044036865,-0.0058174133,0.013801575,-0.012817383,0.01272583,-0.014198303,0.025970459,-0.0053215027,0.041290283,-0.03857422,0.018798828,0.031555176,0.021438599,-0.01928711,0.03717041,0.0680542,0.019470215,-0.0008749962,0.03137207,-0.0038337708,-0.0028514862,-0.006832123,-0.022567749,0.048553467,0.00390625,0.05230713,0.04107666,0.005657196,0.0049972534,0.025161743,-0.023208618,-0.017669678,0.07067871,0.0234375,-0.020614624,-0.0059280396,-0.004890442,0.009864807,-0.037628174,-0.01777649,0.021194458,-0.013679504,0.0033721924,-0.014907837,-0.004005432,-0.012458801,-0.003686905,0.0037956238,0.017578125,-0.015213013,0.020553589,0.027648926,0.0075798035,0.026168823,-0.0005965233,0.0236969,-0.02305603,-0.021942139,0.02267456,0.019256592,-0.015571594,-0.0023479462,0.031036377,0.008460999,0.04269409,0.04095459,-0.020507812,0.0031909943,0.023849487,0.013366699,0.0029773712,0.057281494,0.036193848,0.003232956,0.04244995,0.029647827,0.03805542,-0.038970947,0.024719238,0.0052108765,0.00027179718,-0.016174316,-0.016113281,0.0025787354,-0.010635376,0.022354126,-0.008834839,-0.01423645,0.017456055,0.020217896,-0.012184143,-0.008773804,-0.0029563904,0.006439209,-0.020843506,-0.0039711,0.012107849,-0.016204834,0.028427124,0.014762878,0.019973755,-0.027999878,0.030563354,-0.007911682,-0.02027893,0.00019860268,0.032836914,-0.040893555,0.012245178,-0.0036125183,-0.004337311,-0.048431396,0.0014238358,0.0209198,-0.0040016174,0.014785767,0.01373291,-0.00592041,-0.007801056,0.026687622,0.01474762,-0.0029277802,-0.007904053,-0.022369385,0.021484375,0.034820557,0.0019216537,0.005886078,-0.012840271,-0.006099701,0.0031757355,-0.0070648193,-0.004558563,-0.01158905,-0.0178833,-0.015014648,0.016601562,0.034301758,0.018295288,0.054718018,-0.023956299,-0.013572693,0.014022827,0.03652954,-0.0065193176,-0.0023956299,-0.0014324188,0.022842407,-0.026626587,0.048339844,0.041046143,0.014503479,0.034088135,-0.001783371,-0.011413574,0.019744873,-0.016326904,0.024490356,-0.01499939,-0.0033073425,-0.0018396378,0.030349731,-0.016189575,-0.04232788,0.011070251,-0.027862549,-0.029678345,-0.019836426,0.011886597,-0.002714157,0.028396606,0.040740967,0.01789856,-0.03036499,0.062286377,-0.017471313,0.049194336,0.0004708767,-0.02268982,0.044769287,0.026794434,0.032226562,0.0054244995,0.0112838745,-0.035858154,0.02130127,0.027923584,0.030319214,0.0077590942,0.001540184,-0.012680054,0.031311035,-0.003955841,0.03439331,-0.0034809113,0.0075263977,0.014572144,-0.009300232,-0.007507324,-0.010093689,-0.0041275024,-0.0019369125,0.048217773,-0.022277832,-0.012969971,-0.036499023,-0.00756073,0.02558899,-0.01171875,-0.0010633469,-0.007873535,-0.016967773,0.008743286,-0.024902344,-0.019729614,0.018600464,0.02116394,-0.046875,-0.009460449,0.012451172,0.019866943,-0.020751953,0.032836914,0.028152466,-0.007144928,0.004589081,0.039520264,-0.006198883,0.024475098,-0.010688782,0.026504517,0.026275635,0.0082473755,-0.02104187,-0.0036830902,0.014320374,-0.013587952,0.017471313,0.03173828,-0.01675415,-0.00065374374,-0.0032863617,-0.01096344,-0.0067329407,-0.0010528564,-0.011993408,0.0031280518,-0.010108948,-0.0016317368,0.012664795,0.008277893,-0.0027256012,0.013336182,-0.0062561035,-0.021087646,0.0128479,0.04208374,0.019302368,-0.030960083,-0.006210327,0.010932922,-0.0017547607,-0.01977539,-0.01612854,-0.005710602,-0.032043457,0.00774765,0.01965332,0.011894226,0.013442993,-0.02394104,-0.0025234222,0.01512146,0.0009765625,0.013458252,0.009391785,-0.0031585693,0.0084991455,-0.016433716,-0.012016296,-0.009765625,-0.01360321,0.00920105,0.027313232,0.009849548,-0.023742676,0.019317627,-0.007896423,0.011299133,0.0016975403,-0.0037994385,0.022781372,-0.0069885254,-0.000446558,-0.00881958,0.019882202,-0.0047798157,-0.009513855,-0.008659363,0.035339355,0.04736328,-0.012504578,-0.010925293,0.017105103,0.018295288,0.023086548,0.04458618,0.016464233,0.036895752,0.022720337,-0.016357422,-0.02368164,0.019226074,-0.012397766,-0.036621094,0.009376526,-0.0052223206,-0.007835388,0.017196655,0.006450653,0.0035629272,-0.03253174,-0.01474762,-0.010719299,-0.016937256,0.013877869,-0.006088257,0.019134521,-0.024414062,-0.01802063,0.011833191,-0.024627686,-0.051361084,-0.016677856,-0.0029239655,-0.015464783,-0.05456543,0.0013465881,-0.027175903,0.0035190582,-0.022491455,0.0059165955,-0.011657715,0.022644043,-0.009117126,-0.012054443,0.0028514862,0.029571533,0.029205322,0.006881714,0.018814087,-0.024032593,-0.008918762,-0.025863647,0.011390686,-0.019470215,0.025756836,0.006603241,0.0289917,0.025756836,-0.019760132,0.0069274902,-0.013694763,-0.0034942627,-0.019439697,-0.018325806,-0.025817871,0.023330688,0.015602112,-0.0035800934,-0.007911682,0.03338623,-0.028213501,-0.0070381165,0.029205322,0.034851074,0.0034236908,0.032592773,-0.023330688,0.006214142,-0.020614624,-0.002336502,-0.012069702,0.0058250427,0.0064353943,0.015052795,-0.0078125,0.016021729,0.017196655,-0.01991272,0.004623413,0.030792236,0.011184692,-0.0071983337,0.041625977,0.013587952,0.007080078,-0.008201599,-0.0054512024,0.021591187,0.054718018,0.008895874,0.009765625,-0.005256653,0.0066986084,-0.01625061,0.0101623535,0.015068054,-0.020050049,-0.04727173,-0.013908386,-0.024963379,0.026657104,-0.0010843277,0.0013437271,-0.009239197,0.016662598,-0.013977051,-0.03555298,-0.015823364,0.027893066,0.015144348,-0.018463135,-0.009681702,0.013000488,0.017684937,-0.02708435,-0.0033988953,-0.0440979,-0.038604736,-0.014823914,-0.016464233,0.02720642,0.009811401,-0.008972168,-0.0035991669,-0.0029659271,-0.0013084412,-0.0026474,0.017745972,-0.013153076,-0.0021305084,0.017456055,0.027236938,-0.016571045,0.022460938,-0.012420654,0.0013189316,0.0066986084,-0.013641357,0.016525269,-0.019195557,0.0357666,-0.015945435,-0.0039482117,0.03643799,-0.00006657839,0.016784668,-0.041015625,-0.0018730164,-0.008094788,-0.011169434,0.04727173,-0.022369385,-0.016220093,0.005584717,-0.017608643,-0.01701355,0.004421234,0.0099105835,0.02458191,-0.005290985,0.05529785,-0.010559082,-0.005935669,0.013870239,0.018493652,-0.015144348,0.008613586,0.025558472,0.007972717,0.004798889,-0.0072250366,-0.013893127,-0.026992798,-0.0071792603,0.020507812,-0.0066833496,-0.017288208,0.025497437,0.017089844,0.04547119,-0.0016536713,0.02394104,0.016067505,0.0034675598,0.03768921,0.002943039,0.046569824,-0.007293701,-0.03640747,0.00040769577,0.0032653809,-0.026824951,0.012336731,-0.003692627,0.0037631989,-0.036590576,0.0158844,0.00044250488,0.023345947,-0.006225586,0.009460449,-0.023162842,-0.005214691,-0.03866577,-0.0043144226,-0.043945312,0.002708435,0.027954102,0.007457733,0.03213501,-0.0033683777,-0.018249512,0.029388428,0.045318604,0.006061554,-0.029006958,-0.020599365,0.0064888,-0.0029029846,0.014587402,0.010391235,-0.021575928,-0.018707275,0.0053253174,-0.019577026,0.0071144104,-0.019989014,0.017944336,0.0096588135,0.0035438538,-0.017349243,0.025222778,-0.0025119781,0.00096178055,0.01335907,0.0053100586,0.029525757,0.029418945,-0.018341064,0.01625061,0.016799927,-0.04647827,0.059631348,-0.008636475,0.030670166,-0.014076233,0.012245178,-0.03955078,-0.026290894,-0.015686035,0.010063171],"createdAt":"2026-04-18T18:58:29.767Z","updatedAt":"2026-04-22T23:02:08.189Z","lastSeenAt":"2026-04-22T23:02:08.189Z","tsv":"'/api':193 '/api/v1/transactions/123':69,232 '/docs':192 '/pricing':194 '/readme':196 '/request':19,38,164 '0.02':18,37,91,163 '000':85 '0x8335':185 '20':84 '2913':186 '300':175 '402':79 '402 payment api' 'access':75 'advertis':101 'ai':12,31,131 'ai-inference' 'analysi':135 'analyt':125 'anywher':246 'api':5,24,45,74,95 'attach':104 'avail':223 'base':8,27,63,86,184 'base network api' 'behavior':229 'broad':50 'call':4,23,93 'caller':102 'catalog':51 'categori':123 'challeng':80,168 'classif':138 'classification' 'connect':202 'contract':182 'convers':155 'conversion' 'cover':10,29 'crawl':226,249 'data':11,30,124,128,240 'data-analytics' 'detail':209 'document':187,218,245 'embed':139 'embeddings' 'enabl':44 'endpoint':16,35,57,67,120,159,233 'estim':149 'exact':171 'exampl':222 'exchang':144 'expect':237 'export':129 'extrem':189 'feed':143 'financ':13,32,140 'finance-data' 'four':122 'gas':148 'generat':156 'geocod':153 'geocoding' 'header':109 'i.e':90 'infrastructur':151 'input':235 'insight':130 'key':96 'learn':133 'limit':99 'list':71,158 'low payment fee' 'lowpaymentfee.com':39 'machin':132 'materi':250 'metric':126 'micropayment api' 'network':64 'offer':48 'openapi':213 'organ':118 'page':197 'pay':2,21,54,111 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':108,172 'per':3,22,55,92 'platform':6,25,46,117 'premium':73 'price':142,165 'prompt':204 'quot':147 'rate':98,145 'receiv':113 'render':199 'report':127 'request':56,81 'request/response':216 'respons':115 'return':77,242 'schema':217 'scheme':173 'second':176 'sentiment':134 'sentiment-analysis' 'settl':58 'share':160 'simpli':103 'spars':190 'spec':214 'specif':66,228 'specifi':169 'summar':137 'target':179 'technic':208 'text':136 'text-summarization' 'timeout':177 'token':146 'unit':87 'usag':221 'usdc':9,28,60,89,181 'usdc api' 'usdc-base' 'util':15,34,152 'valid':154 'validation' 'wallet':203 'web3':141 'x':107 'x-payment':106 'x402':43,167 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"bff9fb88-cc03-4fd4-b8be-dbd0ae3e9d2d","listingId":"e7b73835-57aa-4fcf-ab0a-6f327360bc0a","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/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:29.767Z"}],"sources":[{"listingId":"e7b73835-57aa-4fcf-ab0a-6f327360bc0a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:29.767Z","lastSeenAt":"2026-04-22T23:02:08.189Z"}],"details":{"listingId":"e7b73835-57aa-4fcf-ab0a-6f327360bc0a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/123 \\\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 x402 challenge requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/123"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/123"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, or gas estimates via micropayment","Running geocoding, validation, or data conversion tasks with per-request billing"],"bestFor":["AI agents needing keyless, pay-per-call access to a variety of utility endpoints","Developers who want to avoid subscription commitments and pay only for actual usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly compared to subscription APIs","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.934Z"},"updatedAt":"2026-04-22T23:02:08.189Z"}}