{"id":"12dd27dc-3c0a-4836-a80d-6e3e5b6e8106","shortId":"kBF3An","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/131` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…on Base), which equals $0.02. Payment is made per-call with no API keys, no rate limits, and no minimum commitments required. The x402 challenge specifies a POST method with a 300-second payment timeout.\n\nNote that while the landing page lists many endpoints, the probed endpoint (`/api/v1/inbox/131`) does not correspond to any of the named endpoints on the homepage. Its exact functionality is unclear — it may be a generic inbox or messaging endpoint, or a catch-all premium access route. No OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-api","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","serverless API billing","crypto API payments"],"warnings":["The endpoint path /api/v1/inbox/131 does not match any named endpoint on the homepage — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/api, /pricing, /README) are gated behind a wallet connection and returned no useful content.","The platform lists many endpoints on its homepage but none have been individually verified beyond this one probe."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/131","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/inbox/131","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), but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific endpoint path /api/v1/inbox/131 is not explained anywhere on the site. The /api, /pricing, and /README pages are empty behind a wallet gate.","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":"2026-04-21T21:32:33.439Z","embedding":[-0.015159607,-0.02255249,0.052642822,0.014450073,0.012252808,-0.037475586,-0.015792847,0.03439331,0.062561035,-0.070373535,0.025146484,-0.04284668,-0.028900146,-0.03111267,-0.007972717,0.0184021,-0.008262634,0.00084638596,-0.04748535,0.03475952,0.01689148,-0.014053345,-0.018859863,0.041900635,-0.0056037903,-0.028244019,-0.011497498,-0.009124756,-0.008140564,-0.037353516,0.05117798,-0.028137207,0.00047302246,0.01687622,-0.006416321,-0.0034179688,0.001490593,0.036834717,0.026977539,-0.010635376,-0.025726318,-0.04611206,0.018753052,-0.016433716,-0.059661865,-0.009689331,0.0037021637,-0.0040016174,0.004219055,0.016326904,-0.03604126,0.008811951,0.010520935,0.002696991,0.015029907,0.016021729,0.0023536682,0.007019043,0.012992859,0.029083252,0.0049743652,-0.060455322,-0.026031494,-0.0043258667,-0.0030345917,0.04373169,-0.00028061867,0.047058105,0.009864807,0.06384277,0.017822266,0.054779053,0.01713562,0.008346558,0.007331848,-0.024856567,-0.0021076202,0.054260254,-0.014320374,-0.01058197,-0.0006456375,-0.019989014,-0.058746338,-0.006538391,-0.015792847,-0.04763794,-0.019607544,0.027023315,-0.040130615,0.017532349,-0.07299805,-0.026916504,-0.009109497,0.00674057,0.00052165985,-0.004638672,-0.004470825,0.0048065186,-0.010643005,0.034088135,0.0061798096,-0.04812622,0.015266418,-0.004142761,0.04196167,0.047180176,0.030303955,0.017333984,0.014343262,-0.011512756,-0.03942871,0.018707275,-0.032348633,-0.022216797,0.008979797,-0.0046920776,0.0017633438,0.024475098,-0.041900635,0.013542175,-0.034088135,0.04812622,0.0038394928,0.0011444092,0.0028095245,-0.05911255,0.00068950653,-0.0021209717,-0.03488159,-0.005558014,0.009651184,0.014411926,0.023498535,-0.02658081,-0.039001465,-0.003358841,-0.03060913,-0.018539429,-0.044677734,-0.040740967,0.03756714,-0.027816772,0.015457153,0.033050537,-0.083496094,-0.020980835,-0.045898438,-0.014503479,-0.011306763,-0.017303467,-0.0030460358,0.031829834,-0.02142334,-0.029556274,-0.011932373,-0.017578125,0.015029907,0.03152466,-0.019424438,0.042297363,-0.009422302,0.0077934265,0.015930176,-0.011146545,0.0071983337,0.021942139,0.0090408325,-0.08514404,-0.07525635,-0.018722534,0.012176514,-0.020309448,-0.022415161,-0.003856659,0.0051498413,-0.051208496,-0.026611328,-0.007133484,0.0023422241,-0.05303955,0.006565094,-0.020004272,0.024261475,-0.025283813,-0.048675537,-0.013671875,-0.012611389,0.04727173,0.025985718,0.028656006,0.02998352,-0.028213501,0.070129395,0.04815674,-0.023284912,-0.0335083,0.02558899,-0.0231781,0.020614624,0.012794495,0.003824234,-0.043304443,0.026519775,0.07006836,-0.00094747543,-0.0045547485,-0.0045051575,-0.040649414,-0.053253174,-0.028274536,0.032470703,0.0070877075,0.0049819946,0.02748108,-0.04736328,-0.053985596,-0.010246277,0.0023918152,0.018569946,0.04989624,0.021148682,0.016677856,0.0064048767,0.019454956,-0.025756836,0.043945312,0.03488159,0.005493164,-0.018707275,-0.020462036,0.017059326,0.02017212,-0.013999939,0.004627228,-0.0025863647,0.03717041,-0.0045547485,0.010917664,0.019622803,-0.004173279,-0.01802063,-0.020950317,-0.012702942,0.016662598,0.009468079,-0.017868042,-0.035705566,-0.07183838,0.03692627,0.035491943,0.047424316,-0.0049858093,0.0029468536,-0.029449463,-0.0004837513,-0.061340332,0.05923462,0.06829834,-0.0022468567,-0.021408081,0.020645142,-0.0140686035,-0.036590576,0.02609253,-0.00592041,-0.030853271,-0.0031757355,0.010047913,-0.04949951,-0.011581421,0.0009021759,0.02130127,0.060272217,-0.011703491,-0.03967285,-0.022994995,0.0011949539,-0.015686035,-0.017822266,0.009338379,-0.019226074,0.017959595,0.0135650635,-0.014831543,0.016357422,-0.012321472,0.021255493,-0.01689148,0.0113220215,-0.026992798,-0.0335083,0.0071792603,0.00092315674,-0.048461914,0.0019435883,-0.021835327,0.055786133,-0.04446411,0.028961182,-0.0013217926,0.009315491,0.03894043,0.028289795,-0.061035156,0.008468628,0.020553589,0.027954102,0.061431885,0.007080078,-0.030349731,-0.014282227,0.085510254,-0.018707275,-0.0036296844,0.012413025,-0.00630188,0.021697998,-0.009719849,-0.0491333,-0.033935547,-0.010643005,-0.005897522,0.018341064,-0.011543274,0.03189087,-0.008964539,0.027450562,-0.011619568,-0.010429382,-0.024307251,0.030273438,-0.027893066,0.016677856,-0.022949219,-0.02885437,0.015258789,0.005771637,-0.00749588,-0.0005121231,0.04144287,0.02961731,-0.006969452,-0.045318604,-0.030532837,-0.015930176,-0.0003504753,0.026443481,0.03427124,0.01512146,0.049713135,-0.03866577,0.0070991516,0.05380249,0.011947632,0.040130615,0.0038833618,0.0037212372,-0.07739258,-0.04421997,-0.015335083,-0.04714966,0.021316528,0.023269653,0.0012540817,0.050231934,0.007621765,-0.043548584,-0.06695557,0.034820557,-0.047943115,0.0181427,0.051239014,-0.014793396,-0.031951904,0.003774643,-0.0000021457672,0.0067710876,0.034362793,0.013015747,0.010513306,0.08532715,0.035247803,0.0004925728,0.0284729,0.02432251,0.030303955,0.0034542084,-0.017623901,-0.02468872,-0.0027885437,0.038482666,-0.019424438,-0.019317627,-0.08312988,0.05831909,0.03213501,0.077941895,0.023773193,0.016586304,0.040893555,-0.0023002625,0.0015382767,-0.0284729,-0.01991272,-0.051116943,-0.04751587,0.047546387,-0.026107788,0.0099487305,-0.029800415,0.03463745,-0.013923645,0.016830444,-0.028060913,0.03677368,0.004962921,-0.001162529,0.014289856,0.0068740845,0.060058594,0.06365967,-0.04446411,0.022827148,0.032318115,-0.030929565,0.02406311,0.05303955,-0.017852783,-0.008094788,-0.06542969,-0.0345459,-0.0063095093,-0.008110046,-0.050323486,-0.0032691956,-0.007335663,0.0079422,0.04348755,-0.017425537,-0.003545761,-0.008644104,-0.027191162,-0.06311035,0.0049438477,-0.039093018,0.0154418945,0.031677246,-0.024108887,-0.005886078,-0.00035095215,-0.023605347,-0.020324707,0.00028157234,0.03475952,-0.002626419,-0.05810547,0.03286743,0.0067214966,-0.0040130615,0.01486969,0.03277588,0.0044441223,0.024856567,0.04537964,0.021316528,-0.014846802,-0.04522705,0.034210205,-0.0491333,0.016189575,0.023208618,-0.0211792,0.012184143,-0.0072250366,-0.043701172,-0.031311035,0.010231018,-0.010971069,-0.01826477,0.02444458,-0.029373169,-0.02331543,-0.044036865,-0.01928711,0.000047028065,0.055480957,0.030349731,-0.004760742,-0.058685303,-0.008354187,0.019058228,0.005138397,0.027786255,-0.01473999,-0.01348114,-0.015853882,-0.027420044,-0.016189575,-0.014770508,0.022033691,0.0015630722,-0.009689331,0.034851074,0.011474609,0.01626587,-0.0007901192,0.0055274963,0.030593872,-0.033355713,-0.014213562,-0.0045280457,0.033966064,0.012763977,-0.008102417,-0.04714966,0.031143188,0.020858765,0.043823242,-0.021209717,-0.006980896,0.0009975433,0.024536133,0.012504578,-0.010597229,-0.006122589,-0.009521484,-0.06866455,-0.08416748,0.041290283,-0.026184082,0.025924683,0.0149002075,0.014083862,0.015411377,-0.026687622,0.0151901245,0.008842468,-0.025665283,-0.005268097,-0.014305115,-0.02279663,-0.009155273,-0.012184143,-0.007019043,0.017959595,-0.005592346,0.01159668,-0.007045746,-0.009643555,0.025619507,-0.0006928444,-0.009086609,0.02748108,-0.0077781677,0.025146484,0.034332275,0.01360321,-0.04547119,0.03253174,-0.0019350052,0.020355225,-0.005088806,0.047973633,0.03466797,0.017913818,-0.016677856,-0.009239197,-0.022079468,-0.025634766,0.010902405,0.009101868,0.018096924,-0.015174866,-0.049438477,0.016159058,-0.0044059753,-0.0446167,-0.03225708,0.017532349,0.013938904,-0.03955078,0.009109497,0.014953613,0.060394287,-0.031036377,0.024368286,0.0074424744,0.044433594,0.046295166,0.0127334595,-0.022232056,0.010787964,0.0032157898,0.0132751465,-0.015045166,-0.012802124,0.022247314,0.0011949539,0.017288208,0.033569336,0.008041382,-0.017929077,-0.02897644,0.00070619583,-0.019927979,-0.01864624,0.009742737,0.033721924,0.028823853,-0.0345459,0.0146484375,0.0023956299,-0.018081665,-0.013336182,-0.016906738,0.0284729,-0.0011348724,-0.004283905,0.019866943,0.014633179,0.013648987,-0.045166016,-0.007297516,0.009666443,0.0032863617,-0.025558472,-0.055847168,-0.048614502,0.0028934479,0.022064209,0.008041382,0.021209717,0.025283813,-0.008666992,-0.00050497055,0.013404846,0.0074157715,-0.023391724,-0.009468079,-0.035247803,-0.0052261353,-0.0031604767,-0.0020313263,-0.04083252,0.016159058,-0.007160187,-0.025238037,-0.00844574,-0.013595581,0.0032844543,-0.007335663,0.00970459,0.04949951,0.0014781952,0.013999939,-0.016403198,-0.027679443,-0.012084961,-0.004032135,0.025360107,-0.047851562,0.016586304,-0.00491333,0.0005784035,-0.0019931793,0.006942749,0.013893127,0.021148682,0.013015747,0.031066895,-0.039733887,0.050109863,-0.016159058,0.026550293,-0.005455017,-0.024658203,-0.003780365,-0.02305603,-0.010971069,0.038909912,-0.029846191,-0.027816772,-0.02545166,-0.03579712,-0.005443573,-0.045959473,0.01725769,0.035858154,0.029403687,-0.02456665,0.008544922,0.015319824,0.0015611649,-0.017242432,-0.0029010773,-0.0055885315,0.019729614,0.030090332,-0.006072998,-0.019638062,-0.020080566,-0.025344849,-0.0052948,-0.048706055,-0.06286621,-0.009056091,0.012687683,0.0011444092,-0.012496948,-0.018447876,-0.03161621,0.0049476624,-0.045166016,0.019866943,-0.0026226044,0.021408081,-0.0071640015,-0.028076172,-0.001578331,0.01499176,-0.010932922,0.029724121,0.00919342,-0.00724411,-0.029251099,0.008911133,0.035064697,0.020446777,-0.0016202927,-0.0209198,-0.0032863617,-0.033325195,-0.057800293,-0.0073127747,-0.009994507,-0.00749588,-0.010070801,0.013442993,-0.04269409,0.011749268,-0.008422852,-0.01852417,0.022705078,-0.0013875961,-0.013473511,-0.008354187,0.01625061,-0.005332947,-0.01965332,-0.021331787,0.015464783,0.011100769,-0.0032291412,0.026046753,0.050872803,0.0017681122,-0.020843506,0.023727417,0.007675171,0.0126571655,-0.021606445,0.00046300888,-0.024429321,0.0046310425,-0.015060425,-0.020217896,-0.0284729,-0.00969696,0.08532715,0.009994507,-0.0014896393,-0.02456665,-0.010215759,0.013549805,0.027954102,-0.026290894,-0.0009689331,-0.029876709,0.006702423,-0.031921387,0.02998352,0.008163452,0.025726318,-0.017929077,-0.047302246,-0.009590149,0.002626419,-0.00061416626,-0.0619812,-0.014556885,-0.061187744,0.010971069,-0.024612427,-0.03857422,-0.0000044107437,0.0073165894,-0.01259613,-0.08337402,0.01235199,0.045806885,0.008460999,0.03125,-0.001367569,0.012840271,0.01020813,-0.023925781,0.009506226,0.021743774,-0.028213501,-0.016815186,-0.015625,0.022125244,0.01576233,-0.010559082,0.010101318,0.0014095306,0.019866943,-0.007232666,0.019927979,-0.021362305,0.025985718,-0.025512695,0.0088272095,-0.012489319,-0.012130737,0.027297974,-0.050811768,0.03213501,0.01828003,-0.005744934,0.0019760132,0.033203125,0.04019165,-0.035614014,-0.02368164,0.009841919,0.0027103424,0.015205383,-0.02494812,0.04849243,0.010131836,-0.020233154,0.018692017,-0.00623703,-0.008117676,-0.01927185,-0.029159546,0.019714355,0.00070858,0.013450623,-0.017059326,-0.004966736,0.019973755,0.0029888153,0.016418457,-0.007396698,-0.020370483,-0.005897522,-0.0057296753,-0.0048980713,0.009254456,0.0078125,0.03213501,0.021636963,0.019348145,-0.0055656433,-0.018951416,-0.0033454895,0.026443481,-0.006603241,0.002702713,0.032836914,0.018249512,0.0051078796,0.016723633,0.000023305416,-0.033325195,-0.006095886,-0.01940918,-0.01121521,0.0101623535,-0.018951416,-0.009315491,-0.0023860931,0.0070610046,-0.015426636,-0.033935547,-0.0024051666,-0.029830933,-0.024169922,0.003376007,0.0044555664,0.028930664,0.008544922,0.004863739,0.0021419525,0.006214142,0.037017822,-0.002023697,-0.021606445,0.023925781,0.022415161,0.012336731,-0.041900635,-0.004470825,0.0046691895,0.004058838,-0.000644207,-0.028640747,0.0041999817,0.03677368,-0.014831543,0.0211792,-0.012374878,0.02696228,-0.0124053955,0.009185791,-0.009155273,0.01096344,-0.014518738,0.0234375,-0.034118652,0.02053833,0.02973938,-0.001876831,-0.019973755,-0.028503418,-0.034423828,0.020599365,0.0015420914,-0.0029964447,0.048583984,0.019134521,0.015670776,-0.016860962,-0.005455017,-0.0011940002,-0.039398193,-0.017913818,0.033050537,0.0021705627,0.0029659271,0.01184082,-0.0256958,0.017654419,-0.03338623,0.016052246,0.00077724457,0.0014400482,-0.006126404,-0.014701843,-0.012939453,0.006462097,-0.024414062,-0.00087833405,0.0008625984,0.060638428,0.024673462,0.052093506,0.03652954,0.0070343018,-0.01058197,-0.048706055,-0.030014038,0.004398346,-0.023361206,0.022140503,-0.0152282715,0.045013428,0.045562744,-0.0074424744,0.03213501,0.050048828,0.04852295,-0.009819031,0.021057129,-0.015899658,0.0003812313,-0.0015411377,0.03302002,-0.0051078796,0.04736328,-0.03543091,0.020690918,0.036743164,0.021774292,-0.023849487,0.035308838,0.0690918,0.009605408,-0.008911133,0.02420044,0.0009007454,-0.008758545,-0.0027656555,-0.026123047,0.04425049,0.026443481,0.06500244,0.034057617,0.006046295,-0.006591797,0.014976501,-0.025436401,-0.016647339,0.05206299,0.029052734,-0.013343811,-0.0155181885,0.004261017,0.0012741089,-0.04434204,-0.024719238,0.029663086,-0.007980347,0.003063202,-0.020858765,-0.0052604675,-0.012397766,0.012229919,0.027877808,0.011505127,-0.012397766,0.024261475,0.01965332,0.0021877289,0.03274536,0.010131836,0.022445679,-0.03491211,-0.021697998,0.02192688,0.016494751,-0.0036258698,-0.003753662,0.03262329,0.0079422,0.0413208,0.03564453,-0.02142334,0.012702942,0.03137207,0.007171631,0.0048713684,0.072387695,0.023208618,0.005264282,0.03164673,0.03277588,0.034362793,-0.027740479,0.02748108,-0.0019798279,0.013633728,-0.01222229,-0.018875122,0.003917694,0.0004515648,0.020065308,-0.014526367,-0.018508911,0.0015592575,0.031066895,0.0003798008,-0.005126953,-0.005619049,-0.00093221664,-0.0090789795,-0.013671875,0.012039185,-0.024887085,0.020507812,0.0017118454,0.025848389,-0.008422852,0.008026123,0.00039982796,-0.01473999,-0.006996155,0.03591919,-0.042755127,0.016448975,0.004447937,-0.0023841858,-0.044891357,0.012916565,0.019561768,-0.0087509155,0.032592773,0.011459351,-0.015045166,0.015655518,0.020217896,0.010322571,0.009742737,-0.0078048706,-0.021331787,0.026885986,0.045440674,0.0005311966,0.010696411,-0.028579712,-0.0115356445,0.0064964294,-0.0077400208,-0.012084961,-0.0057029724,-0.013084412,-0.03692627,0.018798828,0.03353882,0.021697998,0.03665161,-0.01638794,-0.012626648,0.010307312,0.035064697,0.004917145,0.0012578964,0.00093221664,0.016052246,-0.020019531,0.038879395,0.048309326,0.01890564,0.05569458,-0.005367279,-0.0030765533,0.0019683838,-0.014083862,0.016723633,-0.028900146,0.0017299652,-0.00044035912,0.028656006,-0.013656616,-0.028823853,0.010017395,-0.013923645,-0.0236969,-0.015014648,0.012367249,0.010910034,0.04031372,0.03918457,0.016555786,-0.03466797,0.064331055,-0.009750366,0.048217773,0.003900528,-0.017150879,0.052764893,0.03552246,0.018295288,0.016448975,0.008033752,-0.046569824,0.013404846,0.034179688,0.028869629,0.021469116,-0.009239197,-0.010223389,0.03555298,-0.011001587,0.020309448,0.00057172775,0.00062036514,0.019744873,-0.006362915,-0.00957489,-0.0025577545,0.005832672,-0.0038833618,0.036102295,-0.028274536,-0.0054016113,-0.026153564,-0.014144897,0.043640137,-0.0065460205,-0.009025574,-0.0036678314,-0.009147644,0.011360168,-0.013946533,-0.029907227,0.015083313,0.019470215,-0.04333496,-0.01448822,0.0154418945,0.0017356873,-0.017333984,0.046722412,0.018295288,-0.013870239,0.008071899,0.035064697,-0.014282227,0.0016384125,-0.022399902,0.035125732,0.03881836,0.0035037994,-0.021026611,-0.0056991577,0.00050115585,-0.011413574,0.018249512,0.033721924,-0.0018625259,-0.0010900497,-0.0044136047,-0.0104904175,0.00059986115,-0.0020008087,-0.01890564,0.010375977,-0.0155181885,-0.015670776,0.001912117,0.015296936,0.004135132,0.011688232,-0.029037476,-0.008323669,0.017868042,0.050598145,0.032592773,-0.039154053,-0.005821228,0.00009942055,0.015548706,-0.03213501,-0.011207581,-0.008293152,-0.030410767,0.0135269165,0.019836426,0.008178711,0.019104004,-0.020248413,0.006187439,0.029373169,0.0036449432,0.01524353,0.00983429,-0.011657715,0.0038261414,-0.02053833,-0.0021629333,-0.014320374,-0.0020389557,0.0031852722,0.018981934,0.0015554428,-0.018341064,0.032318115,-0.0041656494,0.014015198,-0.00982666,0.00072956085,0.032928467,-0.0006098747,-0.019454956,0.0022182465,0.009963989,-0.019439697,-0.0070610046,-0.01763916,0.01776123,0.044036865,-0.014228821,0.001200676,0.033081055,0.017471313,0.02229309,0.046966553,0.0053596497,0.047943115,0.02368164,-0.032409668,-0.021438599,0.019226074,-0.011512756,-0.023605347,0.022140503,-0.016555786,-0.027816772,0.011787415,0.0013065338,0.0052223206,-0.02104187,-0.0036792755,-0.019378662,-0.0259552,0.014160156,-0.00079488754,0.01739502,-0.01902771,-0.012962341,0.004348755,-0.024124146,-0.049468994,-0.014228821,-0.00020003319,-0.015777588,-0.06573486,0.0025577545,-0.027633667,0.015731812,-0.0126953125,-0.0056533813,-0.019012451,0.029159546,-0.011062622,0.0009965897,-0.0041122437,0.021362305,0.02494812,0.00548172,0.025817871,-0.03652954,-0.03677368,-0.018096924,0.008628845,-0.015686035,0.017791748,0.0068969727,0.03353882,0.007675171,-0.011711121,0.0074691772,-0.017181396,0.0025291443,-0.013618469,-0.02998352,-0.021987915,0.031555176,0.015930176,-0.004760742,0.0008254051,0.040771484,-0.01008606,0.00006175041,0.026138306,0.027008057,0.0067214966,0.018188477,-0.021148682,-0.00554657,-0.02003479,0.0090408325,-0.019577026,0.0013856888,0.002544403,0.007144928,-0.024429321,0.01878357,0.030517578,-0.011207581,-0.0033683777,0.021591187,-0.004776001,-0.014953613,0.027267456,0.0034809113,0.0022830963,-0.01008606,-0.007621765,0.019577026,0.06121826,0.014137268,0.011955261,-0.0008544922,0.0046653748,-0.00843811,-0.008674622,0.0053482056,-0.035003662,-0.03302002,-0.018585205,-0.017486572,0.016220093,-0.0068244934,0.007873535,-0.004016876,0.017288208,-0.0154953,-0.019821167,-0.021072388,0.029403687,-0.0036449432,-0.001534462,-0.0062675476,0.0024681091,0.01473999,-0.031921387,0.0052604675,-0.028213501,-0.054382324,-0.0057907104,-0.012001038,0.0262146,0.0076942444,-0.018585205,0.0015792847,-0.0061073303,0.0057907104,-0.0099105835,0.026626587,-0.021224976,0.00006365776,0.016281128,0.013938904,-0.031066895,0.027526855,-0.020492554,-0.012817383,0.009750366,-0.0052452087,0.015960693,-0.011741638,0.033721924,-0.0056419373,-0.00081920624,0.036224365,-0.0019397736,0.006816864,-0.033721924,0.013404846,-0.0005340576,-0.01713562,0.03845215,-0.009269714,-0.013763428,-0.015716553,-0.016357422,-0.012504578,0.00932312,0.011795044,0.026062012,0.0013055801,0.04849243,-0.024169922,0.0005970001,0.022644043,0.01600647,-0.024505615,0.005531311,0.032714844,0.01322937,0.003063202,-0.006702423,-0.006164551,-0.03074646,0.002571106,0.01727295,0.010223389,-0.0068244934,0.025131226,0.00024843216,0.039001465,-0.0107040405,-0.00065755844,0.017791748,0.0096206665,0.034362793,0.0082092285,0.025253296,-0.002817154,-0.022964478,-0.0039978027,-0.0015277863,-0.031143188,-0.0043563843,-0.009765625,0.010826111,-0.043884277,0.0064086914,-0.0033359528,0.033966064,-0.020950317,0.017333984,-0.03164673,0.0053253174,-0.037902832,-0.011627197,-0.04611206,0.001367569,0.035095215,-0.0027427673,0.034362793,-0.0056877136,-0.020828247,0.025238037,0.040374756,0.0051460266,-0.025466919,-0.024490356,0.004081726,0.003200531,0.02154541,0.0030460358,-0.013908386,-0.029327393,0.002811432,-0.022125244,0.007686615,-0.0063323975,0.014213562,0.012199402,0.009010315,-0.0053634644,0.02468872,-0.00522995,-0.012084961,-0.0013961792,0.0020561218,0.022125244,0.03074646,-0.008796692,0.019439697,0.026062012,-0.03967285,0.06719971,0.005935669,0.040252686,-0.014038086,0.020751953,-0.032348633,-0.036743164,-0.014923096,0.007896423],"createdAt":"2026-04-21T18:32:20.288Z","updatedAt":"2026-04-22T11:32:55.769Z","lastSeenAt":"2026-04-22T11:32:55.769Z","tsv":"'/api':235 '/api/v1/inbox/131':116,186 '/pricing':236 '/readme':238 '/request':19,38 '0.02':18,37,99,142 '000':132 '0x8335':137 '20':131 '300':170 'Base network API' 'USDC API' 'access':122,219 'across':58 'advertis':127 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,151 'base':8,27,107,133,139 'broad':50 'call':4,23,148 'catalog':51 'catch':216 'catch-al':215 'categori':60 'challeng':126,163 'classif':75 'commit':159 'connect':244 'content':250 'convers':92 'correspond':189 'crawl':233 'crypto API payments' 'data':11,30,61,65 'data-analytics' 'detail':224 'document':225 'embed':76 'enabl':44 'endpoint':16,35,57,95,115,182,185,195,212 'equal':141 'estim':86 'exact':200 'exampl':227 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'found':231 'four':59 'function':201 'gas':85 'generat':93 'generic':208 'geocod':90 'homepag':198 'inbox':209 'infrastructur':88 'insight':67 'key':152 'land':178 'learn':70 'limit':155 'list':118,180 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':145 'mani':181 'maxamountrequir':129 'may':205 'messag':211 'method':167 'metric':63 'micropayment API' 'minimum':158 'name':194 'network':108 'no-api-key' 'no-rate-limit' 'note':174 'offer':10,29 'openapi':222 'page':179,239 'paid':102 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payload':229 'payment':143,172 'per':3,22,55,100,147 'per-cal':146 'per-request-billing' 'platform':6,25,46 'post':166 'post-api' 'premium':120,218 'price':79,97 'probe':184 'prompt':246 'protocol':112 'provid':48 'quot':84 'rate':82,154 'report':64 'request':56,101 'request/response':228 'requir':160 'return':241 'rout':220 'schema':223 'second':171 'sentiment':71 'serverless API billing' 'specif':114 'specifi':164 'substant':249 'summar':74 'text':73 'timeout':173 'token':83 'unclear':203 'unit':134 'usdc':9,28,104,136 'usdc-base' 'util':15,34,89 'utility-services' 'valid':91 'via':109 'wallet':245 'web3':78 'x402':43,111,125,162 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f6145088-3383-4b0c-9272-5af786eae7ae","listingId":"12dd27dc-3c0a-4836-a80d-6e3e5b6e8106","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/inbox/131","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.288Z"}],"sources":[{"listingId":"12dd27dc-3c0a-4836-a80d-6e3e5b6e8106","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/131","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.288Z","lastSeenAt":"2026-04-22T11:32:55.769Z"}],"details":{"listingId":"12dd27dc-3c0a-4836-a80d-6e3e5b6e8106","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/131 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"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 the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/131 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/inbox/131"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand access to AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Programmatic retrieval of financial data like token quotes, gas estimates, and exchange rates","Utility tasks such as geocoding, data validation, and format conversion via simple HTTP POST calls","Building pipelines that pay per request in USDC on Base without subscription overhead"],"bestFor":["AI agents and bots that need keyless, pay-as-you-go API access","Developers who want to avoid API key management and subscription commitments","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed documentation, SLAs, or guaranteed uptime","Applications requiring non-USDC or non-Base payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.275Z"},"updatedAt":"2026-04-22T11:32:55.769Z"}}