{"id":"0302e598-1df7-4ec9-a23a-323d7c987d01","shortId":"VdJaMb","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 marketplace that exposes a broad set of 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 priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/172` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/messages/172` endpoint specifically is unclear; it may be a generic message retrieval or content endpoint, but this cannot be confirmed from available sources.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["pay-per-call API","micropayment API","x402 API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/172 ('Premium API Access') is not documented","All documentation pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content","No example request or response payloads are available","Cannot verify that the advertised AI, finance, and utility endpoints are actually functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/172","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/messages/172","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/172 is unclear. The /api, /pricing, and /README pages are all gated behind a wallet-connect wall with no content.","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":"2026-04-21T23:02:46.485Z","embedding":[-0.025772095,-0.022949219,0.045654297,0.01651001,-0.0012645721,-0.029708862,-0.038757324,0.029083252,0.060058594,-0.06933594,0.011947632,-0.046722412,-0.040252686,-0.033355713,-0.0075149536,0.01512146,-0.00491333,0.0016889572,-0.041778564,0.03640747,0.030715942,-0.022583008,-0.037322998,0.026931763,-0.015327454,-0.032562256,0.00091171265,-0.0007343292,-0.014465332,-0.040252686,0.048736572,-0.032226562,-0.016464233,-0.006980896,-0.016067505,0.0021858215,-0.0071640015,0.026947021,0.026016235,-0.014961243,-0.016693115,-0.055847168,0.0043144226,-0.0082092285,-0.053771973,-0.0047340393,0.022567749,-0.0093688965,0.003709793,0.004924774,-0.035736084,-0.0064315796,0.008308411,0.017456055,-0.003314972,-0.00028777122,-0.00566864,-0.0021820068,0.02218628,0.012466431,0.008163452,-0.042266846,-0.016036987,-0.026504517,-0.0066719055,0.053588867,-0.012207031,0.049591064,-0.00466156,0.056884766,0.04272461,0.041137695,0.02671814,-0.0025806427,0.0075149536,-0.019989014,-0.017150879,0.064208984,-0.019348145,-0.032073975,-0.009819031,-0.019424438,-0.056610107,-0.0027809143,-0.018295288,-0.050994873,-0.009841919,0.024261475,-0.034057617,0.033050537,-0.07727051,-0.00868988,-0.019119263,-0.010932922,0.006690979,-0.023132324,-0.010406494,0.020553589,-0.014678955,0.0073242188,-0.0027599335,-0.055145264,-0.003276825,0.019073486,0.025177002,0.029251099,0.026916504,0.019927979,-0.0007472038,-0.0051994324,-0.05834961,0.021255493,-0.010055542,-0.018173218,0.0068511963,0.0051651,-0.0143966675,0.009681702,-0.027633667,0.013114929,-0.059143066,0.035461426,0.005012512,-0.0008997917,0.008049011,-0.059753418,-0.008262634,0.013122559,-0.02609253,-0.01197052,0.010688782,0.018859863,0.02998352,-0.01134491,-0.029876709,0.0067634583,-0.00919342,-0.019500732,-0.044677734,-0.034484863,0.0345459,-0.029037476,0.018951416,0.036224365,-0.089782715,-0.029251099,-0.05001831,-0.0018310547,-0.02619934,-0.02229309,0.006401062,0.030899048,-0.028656006,-0.02355957,-0.0138549805,-0.025283813,0.00059461594,0.02432251,-0.018341064,0.036712646,-0.017288208,0.02507019,0.010147095,0.0011005402,0.015151978,0.024765015,0.0071907043,-0.10473633,-0.07928467,-0.02897644,-0.014030457,-0.032714844,-0.029220581,-0.017745972,-0.011520386,-0.05480957,-0.0115356445,-0.023284912,-0.0010929108,-0.04373169,0.0037441254,-0.03579712,0.0038661957,-0.020965576,-0.051940918,-0.02130127,-0.013252258,0.06732178,0.018920898,0.016708374,0.020736694,-0.010070801,0.09094238,0.02319336,-0.0078048706,-0.024093628,0.0184021,-0.027709961,0.023864746,-0.008865356,0.009918213,-0.03164673,0.05517578,0.054016113,-0.0074882507,-0.034454346,-0.00919342,-0.03463745,-0.047576904,-0.027069092,0.02848816,0.007286072,-0.005290985,0.022644043,-0.04034424,-0.040374756,-0.012924194,0.014678955,-0.01222229,0.055358887,0.009780884,0.013679504,0.028274536,0.0053901672,-0.044036865,0.041381836,0.025039673,0.007881165,-0.023132324,-0.017150879,0.04562378,0.01701355,-0.024002075,0.0005803108,-0.015182495,0.0390625,0.002456665,0.01486969,0.014297485,-0.0067710876,-0.015167236,-0.024749756,0.0009317398,0.030029297,0.0049095154,-0.02003479,-0.03451538,-0.08300781,0.04748535,0.040130615,0.055480957,-0.015571594,0.0013723373,-0.019348145,-0.0055503845,-0.06262207,0.046295166,0.064819336,0.012176514,-0.01360321,0.019195557,-0.006439209,-0.026977539,0.0011787415,-0.004272461,-0.03692627,-0.0014514923,0.007896423,-0.053619385,-0.008239746,0.023742676,0.0052833557,0.060272217,0.0049934387,-0.054107666,-0.018966675,0.000112473965,-0.0025043488,-0.009994507,0.0047416687,-0.012786865,0.017120361,0.021133423,-0.012031555,0.027038574,0.010543823,0.027389526,-0.016571045,-0.0053710938,-0.018371582,-0.023010254,-0.001499176,-0.0035552979,-0.06640625,0.013427734,-0.0029678345,0.08105469,-0.04248047,0.022842407,-0.00472641,0.010719299,0.03253174,0.0034942627,-0.060821533,0.01146698,0.033813477,0.023971558,0.036743164,0.021148682,-0.04525757,-0.0000045895576,0.070373535,-0.020553589,-0.0073051453,-0.0060272217,0.0029525757,0.036621094,-0.010002136,-0.045684814,-0.03805542,0.00020456314,-0.029922485,0.037994385,-0.01309967,-0.0016479492,-0.015701294,0.017181396,-0.012382507,0.0138549805,-0.028900146,0.021011353,-0.012001038,0.017440796,0.0039138794,-0.02357483,0.014434814,-0.006801605,-0.0023765564,0.0029182434,0.03265381,0.02394104,-0.0018787384,-0.032348633,-0.026626587,-0.015342712,-0.028793335,0.011413574,0.029327393,0.01727295,0.057678223,-0.027786255,0.008407593,0.034240723,0.01638794,0.038726807,-0.01637268,0.0039138794,-0.049835205,-0.031433105,-0.028656006,-0.03982544,0.021438599,0.025985718,-0.0026168823,0.061950684,0.008636475,-0.031341553,-0.04360962,0.034423828,-0.053955078,-0.0048294067,0.015777588,-0.01524353,-0.03729248,-0.010551453,0.0007710457,-0.00023698807,0.02760315,0.0031871796,0.038482666,0.06427002,0.02960205,-0.01638794,0.011268616,0.004142761,0.028701782,0.02128601,-0.014015198,-0.018630981,-0.0075035095,0.034820557,-0.01335907,-0.031188965,-0.06323242,0.0647583,0.046661377,0.050994873,-0.008102417,0.018569946,0.036956787,-0.0008945465,-0.008651733,-0.026931763,-0.011756897,-0.032287598,-0.027877808,0.027893066,-0.0070152283,-0.005958557,-0.018936157,0.034423828,-0.025253296,0.0206604,-0.020477295,0.04034424,-0.016052246,0.015914917,0.0011510849,0.0064582825,0.04260254,0.070739746,-0.05606079,0.011795044,0.019241333,-0.03262329,0.004173279,0.05569458,-0.020965576,-0.0048599243,-0.05227661,-0.02444458,-0.013519287,-0.016540527,-0.05871582,0.0074272156,0.0062179565,0.030792236,0.048034668,-0.018753052,-0.0037574768,0.0015296936,-0.0090789795,-0.08508301,-0.007446289,-0.036254883,0.008430481,0.039520264,-0.009010315,-0.008338928,-0.013092041,-0.012504578,-0.023101807,0.0067596436,0.02154541,-0.010566711,-0.047210693,0.058288574,0.023986816,0.013282776,0.0184021,0.030548096,0.031219482,0.021087646,0.045440674,-0.0014505386,-0.033294678,-0.057250977,0.02357483,-0.055419922,0.014274597,0.025619507,-0.012168884,-0.0037708282,-0.0060195923,-0.030548096,-0.03652954,0.017044067,-0.036193848,0.013450623,0.023239136,-0.029891968,-0.026565552,-0.05709839,-0.015945435,-0.012565613,0.07006836,0.013641357,-0.012908936,-0.04928589,0.0065345764,0.0155181885,-0.0035648346,0.019470215,-0.015640259,-0.020248413,-0.016204834,-0.04385376,-0.007896423,-0.01737976,0.014099121,-0.0068855286,-0.01600647,0.010765076,-0.0016841888,0.021957397,-0.0040359497,0.00258255,0.029647827,-0.03100586,-0.00932312,-0.0045776367,0.033813477,0.010032654,-0.011329651,-0.026184082,0.034118652,0.017150879,0.040863037,-0.027755737,-0.0010404587,0.010734558,0.014816284,0.03491211,-0.018463135,-0.0067710876,-0.010681152,-0.057403564,-0.06311035,0.034454346,-0.016494751,0.028945923,0.030090332,0.026565552,0.013023376,-0.018341064,0.013977051,-0.0044898987,-0.034851074,-0.007297516,-0.030227661,-0.030441284,-0.019012451,-0.00031256676,-0.020812988,0.008026123,-0.012367249,0.01058197,0.017486572,-0.02067566,0.019989014,0.009017944,-0.0079422,0.030792236,0.004299164,0.031341553,0.03466797,-0.0010709763,-0.05105591,0.02709961,0.003194809,0.013008118,-0.0066108704,0.05718994,0.04071045,-0.018875122,-0.014328003,0.0035381317,-0.0036525726,-0.019515991,0.0059318542,0.011795044,0.01876831,-0.019073486,-0.035583496,0.017654419,0.0021533966,-0.028060913,-0.025283813,0.020828247,0.022491455,-0.031082153,0.019577026,0.025772095,0.042785645,-0.026687622,0.0076828003,0.004852295,0.040130615,0.053863525,0.0021839142,-0.0026836395,0.012489319,-0.005092621,0.010391235,-0.022781372,-0.005458832,0.013763428,-0.009338379,0.014785767,0.030975342,0.021118164,-0.029571533,-0.034057617,0.013702393,-0.003484726,-0.022079468,0.00982666,0.0031719208,0.023483276,-0.027618408,0.024490356,0.0062179565,-0.017166138,-0.025512695,-0.010734558,0.026916504,-0.01991272,-0.017059326,0.031188965,0.010505676,0.01852417,-0.038269043,-0.005695343,0.0036258698,0.0071105957,-0.024902344,-0.049987793,-0.043884277,0.014099121,0.015838623,0.025482178,0.023498535,0.03274536,-0.021133423,0.00092601776,0.013336182,0.0037136078,-0.01108551,-0.012962341,-0.038391113,-0.0209198,0.0075149536,0.015045166,-0.03945923,0.02217102,-0.0206604,-0.031951904,0.00085020065,-0.011222839,-0.0036315918,-0.02255249,0.01838684,0.044311523,0.012359619,0.015029907,-0.022644043,-0.027877808,-0.006263733,0.013595581,0.015136719,-0.058929443,0.030166626,-0.0076446533,0.006832123,0.005531311,0.015701294,0.0063819885,0.023605347,0.008270264,0.021835327,-0.031082153,0.04095459,-0.02041626,0.023361206,0.005104065,-0.034729004,-0.014328003,-0.037261963,-0.004142761,0.034851074,-0.019577026,-0.01864624,-0.029815674,-0.03842163,-0.010734558,-0.04324341,0.019515991,0.03463745,0.052337646,-0.020858765,0.005176544,-0.004688263,-0.00003874302,-0.013290405,0.011520386,-0.00024914742,0.022781372,0.027877808,0.00674057,-0.022094727,-0.024734497,-0.030929565,-0.016174316,-0.049468994,-0.055267334,-0.010536194,0.0059814453,-0.011528015,0.00038313866,-0.023239136,-0.034179688,-0.0040130615,-0.046875,0.020355225,0.001490593,0.012992859,0.008140564,-0.02381897,0.0140686035,0.020050049,-0.011726379,0.029525757,-0.004852295,-0.010620117,-0.035003662,0.0031108856,0.021133423,0.01637268,-0.004600525,-0.0036258698,-0.0079193115,-0.016159058,-0.04196167,-0.0060920715,-0.013946533,-0.016036987,-0.007835388,0.0065231323,-0.054138184,0.0006799698,-0.019226074,-0.0059547424,0.03237915,-0.0018234253,-0.0068969727,-0.014083862,0.0074691772,-0.004840851,-0.006752014,-0.0206604,0.011146545,0.0116119385,0.0055351257,0.025344849,0.039398193,0.009262085,-0.011772156,0.017669678,0.011199951,0.025222778,-0.016204834,0.007873535,-0.029953003,0.01940918,-0.018539429,-0.0024757385,-0.031799316,0.0020484924,0.079833984,-0.005329132,-0.005504608,-0.009819031,-0.013534546,0.018371582,0.026016235,-0.045684814,0.0050239563,-0.034118652,0.028823853,-0.031433105,0.023406982,0.009681702,0.021484375,-0.027542114,-0.048583984,-0.005428314,-0.002729416,-0.008674622,-0.070617676,-0.021636963,-0.05038452,0.009857178,-0.0026550293,-0.021636963,-0.0026550293,0.009147644,-0.014297485,-0.08154297,0.0053901672,0.04849243,-0.0029067993,0.020355225,-0.010414124,0.009819031,0.0132369995,-0.02508545,-0.00026130676,0.03704834,-0.036102295,-0.020111084,-0.019515991,0.025558472,0.0056266785,-0.021911621,0.00004118681,-0.0005283356,0.024856567,-0.009841919,0.01638794,-0.026473999,0.03540039,-0.018981934,0.01550293,-0.003255844,-0.008300781,0.043304443,-0.047698975,0.022964478,0.013977051,-0.009780884,0.0030879974,0.024887085,0.036468506,-0.04058838,-0.013572693,0.001496315,0.0027713776,0.036895752,-0.021987915,0.03717041,0.012390137,-0.016983032,0.00945282,0.0019207001,-0.01687622,-0.037017822,-0.03161621,0.037597656,0.0017690659,0.0016393661,-0.012756348,0.0023841858,0.023223877,-0.015823364,0.002626419,-0.011634827,-0.02268982,-0.026641846,-0.0074806213,0.002363205,0.010368347,-0.0019273758,0.020187378,0.011817932,0.034606934,0.005138397,-0.0039138794,-0.010902405,0.03866577,-0.004180908,0.0025367737,0.018310547,0.011436462,0.024276733,0.016921997,0.015914917,-0.03427124,-0.0007472038,-0.024002075,-0.024536133,0.016784668,-0.010429382,-0.0104522705,0.0042381287,-0.00069999695,-0.010383606,-0.026779175,0.010253906,-0.025314331,-0.03439331,-0.0073127747,0.0021686554,0.023620605,-0.0013208389,0.011230469,0.011192322,-0.017578125,0.047698975,-0.0050468445,-0.0284729,0.01499176,0.02784729,0.019592285,-0.03503418,-0.0047721863,0.0046081543,-0.009857178,0.004306793,-0.032348633,0.020767212,0.041900635,-0.014152527,0.018249512,0.019927979,0.02658081,-0.020996094,-0.002696991,-0.0030612946,0.016418457,-0.017166138,0.037750244,-0.059753418,0.0284729,0.00434494,0.008842468,-0.014450073,-0.017700195,-0.028701782,0.021636963,0.002910614,-0.00087690353,0.0362854,-0.0022125244,0.016342163,-0.010101318,-0.016860962,-0.008712769,-0.031951904,-0.022506714,0.018295288,-0.0007658005,0.0077323914,0.015342712,-0.017044067,0.024978638,-0.036193848,0.0034732819,0.012817383,-0.004600525,-0.008880615,-0.013343811,-0.007575989,0.017486572,-0.029708862,-0.0036125183,-0.00242424,0.058441162,0.012123108,0.047210693,0.017196655,0.0068130493,-0.001077652,-0.051574707,-0.030380249,-0.012359619,-0.026550293,0.027160645,-0.026565552,0.039733887,0.041168213,-0.013511658,0.036132812,0.03817749,0.034423828,-0.0022602081,0.022155762,-0.014762878,0.018173218,-0.023025513,0.0231781,0.007293701,0.032562256,-0.03137207,0.028701782,0.032104492,0.01600647,-0.019973755,0.03314209,0.06359863,0.024719238,0.014289856,0.040863037,-0.0011425018,-0.014678955,0.013618469,-0.029190063,0.05065918,0.008232117,0.05834961,0.04638672,0.0007882118,0.0060272217,0.021438599,-0.024871826,-0.030410767,0.043701172,0.025604248,-0.01928711,-0.004802704,-0.0051345825,-0.002166748,-0.027679443,-0.034210205,0.025268555,-0.015396118,0.014503479,-0.025756836,-0.009735107,-0.007347107,0.0046577454,0.015007019,0.010810852,-0.0042800903,0.010772705,0.027740479,0.0076789856,0.025344849,0.002090454,0.022506714,-0.026947021,-0.02104187,0.033599854,0.013122559,-0.015594482,-0.001821518,0.021377563,0.008232117,0.05053711,0.03692627,-0.029220581,0.0005788803,0.03274536,0.011108398,0.0006175041,0.05291748,0.029815674,0.014587402,0.03491211,0.038482666,0.02973938,-0.028335571,0.018920898,0.013946533,0.00242424,-0.0066452026,-0.0024299622,0.013420105,0.000118136406,0.007797241,-0.0042915344,-0.020523071,0.023284912,0.014053345,-0.0099105835,-0.013870239,-0.0149383545,0.016525269,-0.0146484375,-0.0003633499,0.015098572,-0.027023315,0.030715942,0.0016994476,0.02154541,-0.016113281,0.018737793,0.0033226013,-0.027114868,-0.012901306,0.0234375,-0.04473877,0.01663208,0.0033817291,0.0045280457,-0.054107666,0.019424438,0.026748657,-0.016311646,0.032226562,0.015808105,-0.012496948,0.0062026978,0.008743286,-0.0021839142,0.012054443,-0.0007157326,-0.018203735,0.033691406,0.039245605,0.0055351257,0.011230469,-0.015380859,-0.015380859,0.0023460388,-0.0035438538,-0.00793457,-0.007419586,-0.024871826,-0.01676941,0.023223877,0.031799316,0.030578613,0.031433105,-0.024124146,-0.013694763,0.024520874,0.036254883,0.0037002563,0.0049552917,-0.0047416687,0.020065308,-0.025253296,0.049346924,0.047576904,0.022598267,0.049316406,0.0028152466,0.0026550293,0.00598526,-0.005332947,0.022033691,-0.03488159,0.0032348633,0.00034809113,0.02658081,-0.01864624,-0.047729492,0.020812988,-0.024108887,-0.030929565,-0.017700195,0.015014648,-0.0012540817,0.04840088,0.04248047,0.017578125,-0.030654907,0.05984497,-0.013397217,0.045562744,-0.0075683594,-0.024124146,0.044403076,0.027786255,0.031311035,0.0059928894,0.017822266,-0.040039062,0.009025574,0.040863037,0.020980835,0.01083374,-0.011520386,-0.009849548,0.036224365,0.0045318604,0.018478394,-0.012008667,0.013641357,0.005329132,-0.010147095,-0.021224976,-0.009407043,-0.00013315678,0.0030841827,0.052520752,-0.00920105,-0.013053894,-0.024993896,-0.013298035,0.023162842,-0.006324768,-0.006198883,-0.0065841675,-0.028167725,0.00856781,-0.038330078,-0.016571045,0.01727295,0.0055999756,-0.04220581,-0.019058228,0.0107421875,0.010215759,-0.03213501,0.031219482,0.025482178,0.005874634,0.0011348724,0.047698975,-0.020126343,0.02470398,-0.021484375,0.027709961,0.043121338,0.0042877197,-0.034057617,-0.0020008087,0.013961792,-0.017669678,0.016555786,0.02960205,-0.0030879974,0.009239197,-0.00023293495,-0.010116577,0.00030565262,-0.012519836,-0.012229919,0.005519867,-0.008972168,-0.012710571,0.0118255615,0.00466156,-0.0006656647,0.020492554,-0.011627197,-0.025100708,0.016159058,0.039733887,0.027114868,-0.041748047,-0.0067634583,0.009971619,-0.009819031,-0.024719238,-0.020141602,0.0032138824,-0.032409668,0.004425049,0.021957397,0.013267517,0.026016235,-0.020141602,-0.0020828247,0.023986816,0.000017285347,0.010406494,0.006134033,-0.014381409,0.0040512085,-0.015296936,-0.0031547546,-0.017196655,-0.008613586,0.014083862,0.024871826,-0.011772156,-0.024459839,0.029251099,-0.0048942566,0.015777588,-0.0028972626,0.0002002716,0.023208618,-0.0009851456,-0.009315491,-0.0009918213,0.02935791,-0.013397217,-0.015014648,-0.013114929,0.0357666,0.044799805,-0.014083862,-0.0061302185,0.021087646,0.018829346,0.025634766,0.04925537,0.010971069,0.040008545,0.020935059,-0.014976501,-0.0071105957,0.01838684,-0.0008702278,-0.016281128,0.021026611,0.002357483,-0.017303467,0.014152527,0.002494812,-0.0021533966,-0.027404785,-0.024337769,-0.020812988,-0.034088135,0.016479492,0.005050659,0.01828003,-0.017532349,-0.0028572083,0.004169464,-0.027526855,-0.058013916,-0.005279541,-0.0004553795,-0.011238098,-0.05532837,-0.0006723404,-0.02822876,0.015701294,-0.0036029816,-0.0009908676,-0.0231781,0.02519226,-0.016067505,-0.010887146,0.0001847744,0.0184021,0.039367676,0.009567261,0.015541077,-0.019607544,-0.0118637085,-0.030227661,0.024139404,-0.02142334,0.019348145,0.005973816,0.030197144,0.009925842,-0.0035419464,0.006465912,-0.022109985,-0.009292603,-0.012260437,-0.009262085,-0.023422241,0.023361206,0.010246277,-0.009277344,0.0005426407,0.03186035,-0.026657104,-0.011772156,0.026855469,0.043304443,0.0014848709,0.026062012,-0.019973755,0.007709503,-0.021499634,-0.0049591064,-0.014289856,0.008735657,0.009498596,0.004131317,-0.0022411346,0.010803223,0.016357422,-0.0146102905,-0.0058631897,0.015823364,0.016845703,-0.0057792664,0.038024902,0.0256958,0.0044898987,-0.023117065,-0.019210815,0.02268982,0.037994385,0.006881714,0.014884949,-0.0074806213,0.006980896,-0.015136719,0.004760742,0.012290955,-0.025878906,-0.031341553,-0.02519226,-0.028442383,0.030654907,-0.00274086,0.011550903,-0.011177063,0.005153656,-0.018508911,-0.035888672,-0.01600647,0.011116028,0.011627197,-0.01600647,-0.0022239685,0.012245178,0.010681152,-0.02658081,-0.009132385,-0.034576416,-0.032928467,-0.005493164,-0.013771057,0.023010254,0.0033359528,-0.0029067993,-0.012016296,0.0059547424,0.0017032623,-0.01687622,0.024215698,-0.0030212402,-0.008354187,0.02368164,0.018798828,-0.024673462,0.018615723,-0.022369385,-0.008377075,0.013031006,-0.013412476,0.020828247,-0.0184021,0.042816162,-0.0015487671,-0.010093689,0.03729248,0.005153656,0.02758789,-0.027175903,-0.0024642944,0.0061569214,-0.01436615,0.041931152,-0.011550903,-0.013771057,0.0076293945,-0.016799927,-0.031311035,0.012901306,0.020950317,0.024017334,-0.0070228577,0.04876709,-0.00036478043,-0.019546509,0.010108948,0.011398315,-0.007865906,-0.0004582405,0.03564453,0.018722534,0.0027999878,-0.008972168,0.0010538101,-0.042266846,-0.0012159348,0.013671875,-0.0063591003,-0.013542175,0.024871826,0.008163452,0.0446167,-0.004119873,0.015594482,0.013687134,0.0038833618,0.038909912,0.004547119,0.04864502,-0.013793945,-0.038909912,-0.008552551,0.003452301,-0.01977539,0.0055732727,-0.019699097,-0.007007599,-0.04006958,0.018173218,0.0034065247,0.033172607,-0.0061149597,0.016326904,-0.026733398,-0.014167786,-0.04849243,-0.016967773,-0.04888916,0.010047913,0.028762817,-0.0075683594,0.026901245,0.004135132,-0.018539429,0.025375366,0.054016113,-0.0027008057,-0.030517578,-0.008377075,0.011764526,-0.0055389404,0.012687683,0.014289856,-0.017715454,-0.019317627,-0.005558014,-0.022338867,0.016693115,-0.016021729,0.016860962,0.012214661,-0.0038089752,-0.0020599365,0.036071777,-0.013748169,0.010093689,0.017959595,0.0054016113,0.041107178,0.026245117,-0.0206604,0.021591187,0.024978638,-0.054107666,0.06488037,-0.009971619,0.037384033,-0.0143966675,0.018432617,-0.039093018,-0.020843506,-0.008865356,0.0079574585],"createdAt":"2026-04-21T18:32:26.351Z","updatedAt":"2026-04-22T05:32:16.257Z","lastSeenAt":"2026-04-22T05:32:16.257Z","tsv":"'/api':176 '/api/v1/messages/172':112,216 '/pricing':177 '/readme':179 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':122 '6':137 'Base network API' 'USDC API' 'accept':162 'access':118 'across':54 'addit':191 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,150 'application/json':167 'avail':207,237 'base':8,27,103,129,136 'beyond':169 'broad':50 'call':4,23 'cannot':233 'categori':56 'challeng':123 'classif':71 'classification' 'commit':158 'confirm':235 'connect':187 'content':229 'convers':88 'cover':10,29 'crawl':210 'crypto-paid API' 'data':11,30,57,61 'data-analytics' 'decim':138 'detail':193 'document':168,202 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,161,217,230 'estim':82 'exact':146 'exampl':206 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'generic':225 'geocod':86 'geocoding' 'http':163 'infrastructur':84 'insight':63 'key':151 'land':171 'learn':66 'limit':154 'list':114 'low fee API' 'lowpaymentfee.com':39 'machin':65 'made':142 'marketplac':46 'materi':211 'may':222 'messag':226 'metric':59 'micropayment API' 'network':104 'openapi':197 'page':172,180 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':140 'per':3,22,96 'platform':6,25 'post':164 'premium':116 'price':75,93 'prompt':188 'protocol':108 'purpos':213 'quot':80 'rate':78,153 'report':60 'request':97,124 'request/response':200 'requir':159 'resolv':182 'retriev':227 'return':120,166 'schema':201 'scheme':147 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'sourc':238 'spars':174 'spec':198 'specif':110,218 'summar':70 'technic':192 'text':69 'text-summarization' 'token':79 'unclear':220 'unit':130 'upfront':157 'usag':205 'usdc':9,28,100,132 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,143 'wallet':186 'wallet-connect':185 'web3':74 'x402':43,107,145 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"877b90f5-0883-4926-a4e0-76357269b963","listingId":"0302e598-1df7-4ec9-a23a-323d7c987d01","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/messages/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.351Z"}],"sources":[{"listingId":"0302e598-1df7-4ec9-a23a-323d7c987d01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.351Z","lastSeenAt":"2026-04-22T05:32:16.257Z"}],"details":{"listingId":"0302e598-1df7-4ec9-a23a-323d7c987d01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/172 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/172","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/172 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/172"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates on a per-call basis","Running geocoding or data validation tasks with instant pay-as-you-go pricing","Exporting analytics data or generating reports without subscription commitments"],"bestFor":["Agents or developers who want zero-signup, pay-per-use API access","Projects needing lightweight AI inference at very low per-call cost","Crypto-native applications already operating on Base with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that would benefit from bulk pricing or rate guarantees","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.198Z"},"updatedAt":"2026-04-22T05:32:16.257Z"}}