{"id":"d6a8deb7-2e7b-4046-93f6-3894bfb6273e","shortId":"vS2T88","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/125` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.\n\nThe 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 utilities (geocoding, validation, conversion, generation). All endpoints appear to follow the same x402 payment model.\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 example payloads available. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what inputs the `/api/v1/transactions/125` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","crypto API access","402 payment protocol"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/README pages show only 'Connect wallet'","The specific functionality of /api/v1/transactions/125 is undocumented; it is unclear what request body is expected or what the response contains","The platform lists many endpoint categories but none have documented schemas or examples","This endpoint path (/api/v1/transactions/125) does not match any of the advertised API categories on the homepage, making its purpose ambiguous"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/125","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC per request on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/transactions/125 is unclear beyond the label 'Premium API Access'.","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":"2026-04-19T12:02:33.140Z","embedding":[-0.031021118,-0.029251099,0.037231445,0.016326904,0.016067505,-0.026473999,-0.019500732,0.0259552,0.06652832,-0.066223145,0.029632568,-0.041870117,-0.030319214,-0.040039062,-0.012550354,0.013916016,-0.006286621,0.00687027,-0.03390503,0.032348633,0.03137207,-0.016357422,-0.02947998,0.013870239,-0.014755249,-0.005718231,-0.00881958,-0.008720398,-0.02558899,-0.04135132,0.04748535,-0.027679443,-0.00052309036,0.0109939575,-0.00315094,-0.010070801,0.0012207031,0.035369873,0.021652222,-0.0041389465,0.00064611435,-0.062927246,0.0050735474,-0.022949219,-0.049804688,-0.006263733,0.015335083,-0.028961182,0.007980347,-0.005760193,-0.047088623,-0.0006198883,-0.011787415,0.009857178,-0.0010404587,0.0016956329,-0.004497528,-0.012809753,0.0071105957,0.013877869,-0.017623901,-0.059631348,-0.014831543,-0.004436493,0.0028133392,0.052947998,-0.0047416687,0.042816162,-0.0011901855,0.06500244,0.025253296,0.047698975,0.032073975,0.016983032,0.0014066696,-0.007019043,-0.013710022,0.054840088,-0.007446289,-0.028076172,-0.010566711,-0.013969421,-0.05886841,-0.002658844,-0.01928711,-0.05319214,-0.008201599,0.02394104,-0.024810791,0.02418518,-0.07183838,-0.0008587837,-0.00762558,-0.009033203,0.006450653,-0.013473511,-0.0058021545,0.019073486,-0.010757446,0.015113831,-0.009155273,-0.042236328,0.01889038,0.017654419,0.028381348,0.052703857,0.024291992,0.016967773,0.009353638,0.00067949295,-0.035095215,0.0107421875,-0.0026245117,-0.0262146,0.004421234,0.0073623657,-0.015602112,0.009963989,-0.025634766,0.010498047,-0.050689697,0.06262207,0.00944519,0.01133728,-0.0066986084,-0.05230713,-0.016204834,0.016189575,-0.034729004,-0.0054893494,0.009056091,0.019699097,0.02470398,-0.012626648,-0.02734375,0.016403198,-0.025848389,0.000042557716,-0.05105591,-0.029403687,0.0423584,-0.025344849,0.007881165,0.050354004,-0.101379395,-0.012275696,-0.053741455,0.0049819946,-0.028930664,-0.012229919,0.019683838,0.02720642,-0.014389038,-0.017868042,-0.022247314,-0.03062439,-0.011634827,0.043701172,-0.008308411,0.03741455,-0.015853882,0.02671814,0.01576233,0.007019043,0.009429932,0.02305603,-0.004436493,-0.077941895,-0.07574463,-0.018493652,0.009773254,-0.023376465,-0.037139893,0.0066223145,-0.01701355,-0.07183838,-0.016036987,-0.016143799,-0.00046133995,-0.043548584,-0.0028877258,-0.033203125,0.020477295,-0.0036582947,-0.052001953,-0.028900146,-0.036315918,0.059692383,0.035461426,0.024902344,0.014427185,0.0037460327,0.06188965,0.037872314,-0.008148193,-0.018569946,0.014350891,-0.018554688,0.029632568,-0.0154418945,0.019821167,-0.028366089,0.029083252,0.06591797,0.0015459061,-0.030044556,-0.006149292,-0.054595947,-0.049804688,-0.031280518,0.022735596,0.004322052,-0.007534027,0.037506104,-0.037231445,-0.03036499,-0.0002270937,0.013450623,0.01890564,0.057250977,0.019683838,-0.003856659,0.0390625,0.013282776,-0.046691895,0.03845215,0.03866577,0.008903503,-0.021377563,-0.03955078,0.033569336,0.04510498,-0.033966064,0.017089844,-0.019897461,0.024246216,-0.0062332153,0.0041656494,0.007358551,-0.014411926,-0.02166748,-0.0146865845,-0.017608643,0.025009155,0.012702942,-0.025177002,-0.029693604,-0.08679199,0.053649902,0.03933716,0.037078857,-0.0021972656,0.0028419495,-0.02053833,-0.015510559,-0.06732178,0.05014038,0.0713501,-0.011856079,-0.009742737,0.033691406,-0.008361816,-0.040039062,0.0027446747,-0.025741577,-0.036621094,-0.016296387,0.0154418945,-0.046417236,-0.011352539,0.022216797,0.018249512,0.0496521,-0.008430481,-0.055419922,-0.024978638,-0.009880066,0.00356102,-0.028640747,-0.0022945404,-0.005847931,0.023117065,0.027420044,0.00078868866,0.009216309,0.008575439,0.010154724,-0.0073623657,0.00945282,-0.016952515,-0.02017212,0.011169434,0.00062561035,-0.0524292,0.009307861,0.0012197495,0.07659912,-0.044067383,0.038879395,-0.01940918,0.019485474,0.048858643,-0.0070228577,-0.056030273,0.004447937,0.029083252,0.021850586,0.04901123,0.01876831,-0.02381897,-0.009590149,0.08001709,-0.0053596497,-0.0051994324,0.020248413,0.008613586,0.044128418,-0.010368347,-0.052734375,-0.039855957,0.0003466606,-0.033355713,0.02822876,-0.008934021,0.029846191,-0.010765076,0.006958008,-0.022201538,-0.00063085556,-0.032318115,0.010665894,-0.007003784,0.01222229,-0.023406982,-0.02796936,0.012763977,0.007881165,-0.016555786,0.0077400208,0.04916382,0.011772156,-0.0063438416,-0.03479004,-0.029632568,-0.0098724365,-0.015388489,0.017044067,0.020263672,0.02444458,0.051879883,-0.035247803,-0.0019702911,0.01828003,0.022506714,0.040405273,-0.0014762878,-0.006137848,-0.061157227,-0.049865723,-0.019699097,-0.044952393,0.02911377,0.023406982,-0.0051078796,0.068603516,0.0101623535,-0.011077881,-0.02658081,0.013320923,-0.046905518,-0.0025806427,0.044799805,-0.0129470825,-0.039031982,0.002073288,-0.0038776398,0.010124207,0.04046631,0.025360107,0.039367676,0.070495605,0.036315918,0.008415222,0.022613525,-0.0035572052,0.028457642,0.012397766,-0.02645874,-0.030700684,-0.016967773,0.031311035,-0.02180481,-0.019302368,-0.06161499,0.06222534,0.0340271,0.09063721,0.022369385,0.007545471,0.033325195,-0.01576233,0.0069122314,-0.02330017,-0.020202637,-0.021621704,-0.04156494,0.02659607,-0.020080566,-0.019302368,-0.012306213,0.03543091,-0.0050468445,0.0143585205,-0.030258179,0.04031372,-0.021438599,-0.01574707,0.023239136,0.0104522705,0.05441284,0.061828613,-0.045013428,0.02116394,0.016830444,-0.033599854,0.005050659,0.045318604,-0.013038635,-0.010421753,-0.04067993,-0.021591187,-0.005279541,-0.006690979,-0.041107178,0.011871338,0.010009766,0.024932861,0.023834229,-0.0047416687,-0.011772156,-0.0028533936,-0.022445679,-0.05215454,0.0021686554,-0.043121338,0.0011110306,0.039855957,-0.02519226,-0.009590149,-0.0036125183,-0.004119873,-0.012313843,0.010864258,0.028442383,-0.008781433,-0.054534912,0.037506104,-0.0018730164,0.019805908,0.003414154,0.033203125,0.027572632,0.026687622,0.039642334,0.017929077,-0.012168884,-0.06732178,0.016021729,-0.03567505,0.012802124,0.017318726,-0.026290894,-0.004119873,-0.0014877319,-0.032989502,-0.026260376,0.01309967,-0.018417358,-0.0032463074,0.020263672,-0.02142334,-0.02507019,-0.062194824,-0.016036987,-0.004421234,0.06188965,0.017089844,0.006290436,-0.053955078,-0.01108551,0.030044556,0.0046844482,0.033569336,-0.014465332,0.002779007,-0.01411438,-0.034973145,-0.014282227,-0.028182983,0.023742676,-0.0034732819,0.002380371,0.019485474,0.0050239563,0.021774292,0.0070762634,0.0078048706,0.030548096,-0.020355225,-0.014183044,-0.0069465637,0.035461426,0.017852783,-0.016113281,-0.04458618,0.0435791,0.014320374,0.037200928,-0.046051025,-0.0017318726,-0.0055999756,0.0024471283,0.01663208,-0.012062073,-0.010917664,-0.017974854,-0.046173096,-0.07165527,0.04449463,-0.01727295,0.02822876,0.02458191,-0.0028686523,0.02557373,-0.016174316,0.0026340485,0.012184143,-0.026138306,-0.002336502,-0.016967773,-0.032928467,-0.01146698,-0.021316528,-0.02720642,0.022018433,-0.013069153,0.008232117,0.005279541,-0.020065308,0.02999878,0.0077285767,-0.0041160583,0.014320374,0.003768921,0.027160645,0.036499023,0.012054443,-0.056671143,0.022415161,-0.0027008057,0.0023021698,-0.009140015,0.045928955,0.016860962,-0.005607605,-0.010101318,-0.0077552795,-0.021911621,-0.020553589,0.0075645447,0.0008225441,0.001329422,0.00008773804,-0.045013428,0.0135269165,0.0017433167,-0.036102295,-0.031555176,0.010185242,0.008522034,-0.039215088,0.019088745,0.030776978,0.048919678,-0.022323608,0.0030441284,0.005470276,0.03878784,0.036254883,0.0072669983,-0.0027675629,0.026763916,-0.0084991455,0.009033203,-0.012428284,-0.01802063,0.010154724,-0.0010843277,0.023269653,0.02494812,0.00009697676,-0.021713257,-0.029190063,0.0013895035,-0.016967773,-0.027130127,0.035339355,0.018859863,0.023468018,-0.025268555,0.016418457,0.0071372986,-0.01158905,-0.0211792,-0.014907837,0.035980225,-0.016174316,-0.006187439,0.017349243,0.008056641,0.023010254,-0.054748535,-0.008140564,0.0024433136,0.011787415,-0.015670776,-0.050445557,-0.039733887,-0.0023078918,0.041229248,0.003534317,0.01966858,0.028961182,0.0014867783,0.016403198,0.026931763,-0.009643555,-0.018188477,-0.010467529,-0.046020508,-0.026657104,-0.011627197,0.013748169,-0.03878784,0.011253357,-0.0012998581,-0.029342651,0.008766174,-0.02130127,-0.003791809,-0.015808105,0.014335632,0.02859497,0.0093307495,0.015235901,-0.017471313,-0.030075073,-0.006515503,0.01473999,0.012771606,-0.040740967,0.023666382,-0.017974854,-0.013580322,-0.0011453629,0.0137786865,0.021621704,0.022903442,0.015274048,0.037109375,-0.04940796,0.049987793,-0.03277588,0.010650635,-0.0020141602,-0.035125732,-0.021606445,-0.022766113,-0.015075684,0.041107178,-0.03338623,-0.010101318,-0.0345459,-0.037261963,-0.009292603,-0.051208496,0.01625061,0.03918457,0.038513184,-0.017471313,-0.0012540817,-0.002248764,0.012237549,-0.012054443,0.005001068,-0.018798828,0.039031982,0.02720642,-0.005607605,-0.031707764,-0.026748657,-0.015365601,-0.00819397,-0.04260254,-0.051361084,-0.010040283,0.0067367554,-0.019226074,-0.012649536,-0.02330017,-0.036376953,0.00063610077,-0.042022705,0.010917664,0.00045013428,0.018051147,-0.001408577,-0.021438599,-0.00042319298,0.008178711,-0.011413574,0.036834717,0.0016021729,-0.0048561096,-0.047058105,0.009796143,0.02079773,0.0211792,-0.0032672882,-0.031280518,-0.009162903,-0.0146102905,-0.047790527,-0.011207581,-0.005970001,-0.017623901,-0.013412476,0.0014476776,-0.054473877,-0.005924225,-0.028747559,-0.00522995,0.020584106,0.015380859,0.0072784424,-0.0036945343,0.020477295,-0.002023697,-0.014129639,-0.032226562,0.012329102,0.010574341,0.006210327,0.035247803,0.05984497,-0.00356102,-0.028625488,0.005367279,0.007850647,0.010765076,-0.014717102,0.011459351,-0.015403748,0.0098724365,-0.009765625,-0.010597229,-0.03427124,-0.0022296906,0.080078125,0.00047373772,-0.011505127,-0.014801025,-0.017913818,0.01763916,0.029327393,-0.03475952,-0.0037555695,-0.019882202,0.021530151,-0.028335571,0.004306793,0.0016565323,0.024368286,-0.0135650635,-0.048797607,-0.015068054,-0.007030487,-0.01171875,-0.08013916,-0.034973145,-0.070495605,0.0067634583,-0.0070114136,-0.03152466,0.0006599426,0.008148193,-0.022003174,-0.08728027,0.0013141632,0.046875,0.0035476685,0.022781372,-0.011741638,0.026763916,0.036376953,-0.03491211,0.00040864944,0.02508545,-0.034362793,-0.013175964,-0.014259338,0.01878357,-0.012466431,-0.005958557,-0.0057144165,0.007045746,0.011932373,-0.006134033,0.0146102905,-0.0079193115,0.023208618,-0.016647339,0.010215759,-0.019485474,-0.010757446,0.042541504,-0.0546875,0.026184082,0.0121154785,-0.010765076,0.009689331,0.04248047,0.036010742,-0.043060303,-0.01737976,0.008865356,0.016571045,0.02848816,-0.01713562,0.052612305,0.010169983,-0.010505676,0.011207581,-0.013946533,-0.011558533,-0.01966858,-0.03353882,0.017150879,0.0039253235,0.007713318,-0.016189575,-0.004508972,0.022766113,0.004234314,0.008682251,-0.003145218,-0.020217896,-0.01878357,0.010688782,-0.0067443848,0.00831604,-0.0017137527,0.034454346,0.02708435,0.036590576,0.013595581,-0.017486572,0.0064201355,0.028442383,-0.019241333,-0.0051345825,0.030212402,0.01222229,0.020141602,0.0105896,0.013465881,-0.055480957,-0.021438599,-0.02027893,-0.031555176,-0.0024032593,-0.014060974,-0.004924774,-0.0063591003,0.0032444,-0.013175964,-0.030883789,0.0006327629,-0.032073975,-0.030288696,-0.004627228,-0.009933472,0.025985718,0.011375427,0.01727295,0.0065841675,-0.010940552,0.039001465,-0.003578186,-0.016021729,0.03137207,0.027832031,0.019210815,-0.031173706,-0.0016746521,-0.013633728,-0.016998291,0.0019416809,-0.032836914,0.018814087,0.041625977,-0.018417358,0.0011901855,-0.0029144287,0.027267456,-0.011665344,0.005493164,-0.0070228577,0.017822266,-0.008979797,0.03933716,-0.05319214,0.026260376,0.010910034,0.0020923615,-0.017944336,-0.020721436,-0.02458191,0.017150879,-0.0008363724,-0.010444641,0.04849243,-0.0024337769,0.029876709,-0.02281189,-0.026321411,0.004589081,-0.026412964,-0.02494812,0.016540527,-0.010185242,0.0023975372,0.014190674,-0.031036377,0.028701782,-0.03665161,0.014259338,0.0038890839,0.00894928,-0.004486084,-0.015426636,-0.0024585724,-0.014350891,-0.0077552795,-0.0013780594,-0.0050468445,0.04736328,0.017349243,0.03262329,0.055267334,0.019744873,0.0023765564,-0.0395813,-0.024841309,0.0049743652,-0.01675415,0.021591187,-0.012161255,0.053863525,0.03640747,0.0028915405,0.039489746,0.027999878,0.048553467,-0.0008420944,0.010360718,-0.013336182,0.01260376,-0.004486084,0.028457642,-0.011260986,0.034057617,-0.03439331,0.027526855,0.019378662,0.019683838,-0.018814087,0.03479004,0.07122803,0.018371582,-0.008407593,0.03878784,-0.012207031,-0.0019302368,-0.010940552,-0.021514893,0.051940918,-0.0026302338,0.041168213,0.046539307,0.004196167,0.0021591187,0.023544312,-0.03111267,-0.013076782,0.06414795,0.028884888,-0.022445679,-0.012084961,-0.0067596436,0.009666443,-0.04196167,-0.020767212,0.020736694,-0.012794495,0.009300232,-0.0049324036,-0.013595581,-0.016647339,0.0050354004,0.012710571,0.009757996,-0.020507812,0.025146484,0.029525757,0.0019226074,0.025421143,-0.002040863,0.022140503,-0.019638062,-0.021209717,0.022491455,0.02458191,-0.0061073303,-0.008811951,0.023834229,0.009994507,0.03414917,0.04385376,-0.020751953,0.0021705627,0.028198242,0.015914917,-0.0009384155,0.053741455,0.035125732,0.014541626,0.04257202,0.031143188,0.039855957,-0.038360596,0.028671265,0.00064611435,0.0018882751,-0.013252258,-0.008636475,0.0011339188,-0.019256592,0.020324707,0.00037145615,-0.010543823,0.018692017,0.013313293,-0.0039405823,-0.0057411194,-0.0045166016,0.013694763,-0.026748657,-0.0026512146,0.0146102905,-0.015602112,0.033935547,0.012672424,0.02218628,-0.028717041,0.028076172,-0.00223732,-0.016784668,0.001704216,0.030288696,-0.04373169,0.0014867783,-0.003921509,0.0018701553,-0.046936035,-0.0013895035,0.021881104,-0.008682251,0.012321472,0.0143585205,0.0005245209,-0.009140015,0.028564453,0.01828003,-0.00086021423,-0.009552002,-0.020553589,0.022415161,0.039031982,0.0005068779,-0.0011062622,-0.02848816,-0.0046806335,0.0065574646,-0.015548706,-0.0041275024,-0.009963989,-0.02368164,-0.017532349,0.021148682,0.031677246,0.021896362,0.058380127,-0.020187378,-0.011924744,0.011016846,0.040130615,0.005252838,-0.0058517456,0.0051460266,0.016799927,-0.029403687,0.048736572,0.045898438,0.0053215027,0.03527832,0.000109255314,-0.011520386,0.010025024,-0.012535095,0.028457642,-0.013038635,0.00356102,0.0011072159,0.027679443,-0.0126571655,-0.031463623,-0.0010643005,-0.02468872,-0.028625488,-0.011528015,0.017745972,0.0015478134,0.0259552,0.041931152,0.032440186,-0.020004272,0.062683105,-0.014312744,0.0418396,0.0043144226,-0.01625061,0.046569824,0.015090942,0.03289795,0.010566711,0.009994507,-0.035186768,0.019851685,0.03338623,0.021530151,0.014022827,0.0090789795,-0.016738892,0.03515625,-0.0041923523,0.039733887,-0.004261017,-0.00028395653,0.017578125,-0.0065307617,-0.0184021,-0.008720398,-0.0025558472,0.003873825,0.052703857,-0.026000977,-0.0062408447,-0.03250122,-0.006893158,0.026062012,-0.011894226,-0.0032215118,-0.009666443,-0.01828003,0.013542175,-0.029266357,-0.022415161,0.013435364,0.024810791,-0.0541687,-0.012290955,0.010848999,0.02796936,-0.022735596,0.03591919,0.019561768,-0.00409317,0.0023212433,0.043426514,-0.007156372,0.026412964,-0.0146865845,0.027374268,0.029327393,0.008018494,-0.026046753,-0.0052261353,0.0018196106,-0.0077781677,0.0132751465,0.031204224,-0.017852783,0.0014715195,-0.0064926147,-0.0055007935,-0.000010251999,0.007381439,-0.012573242,0.006286621,-0.0040893555,-0.005367279,0.0077934265,0.010719299,-0.009170532,0.005252838,0.012481689,-0.020858765,0.0074005127,0.035217285,0.013648987,-0.030593872,-0.0072402954,0.013999939,0.00504303,-0.016677856,-0.010673523,-0.0030822754,-0.035461426,0.0128479,0.018157959,0.013946533,0.0107040405,-0.026870728,-0.004924774,0.02217102,0.00047779083,0.0074882507,0.0066070557,-0.002439499,0.019302368,-0.004486084,-0.005607605,-0.0009560585,-0.0184021,0.012130737,0.021316528,0.0011491776,-0.029586792,0.020645142,-0.0007176399,0.018493652,0.00044322014,-0.0053367615,0.016555786,-0.012321472,0.0037765503,0.0019321442,0.01914978,-0.00843811,-0.006980896,-0.010375977,0.037017822,0.059570312,-0.013648987,-0.015602112,0.018676758,0.020950317,0.015625,0.040740967,0.0019721985,0.041015625,0.029067993,-0.02067566,-0.024841309,0.022476196,-0.008117676,-0.028549194,0.012626648,-0.003944397,-0.010322571,0.018173218,0.011993408,0.0053482056,-0.03186035,-0.017028809,-0.013893127,-0.018478394,0.003129959,-0.011230469,0.017807007,-0.020904541,-0.0075798035,0.013153076,-0.02279663,-0.045562744,-0.020324707,-0.011054993,-0.017944336,-0.050811768,0.0005803108,-0.027297974,0.0043563843,-0.026931763,0.005607605,-0.012573242,0.012016296,-0.008460999,-0.011917114,0.006881714,0.026565552,0.029067993,-0.00011014938,0.021575928,-0.026229858,-0.011940002,-0.03314209,0.008590698,-0.017440796,0.026123047,0.012809753,0.03552246,0.024169922,-0.007537842,-0.0023937225,-0.009712219,-0.0041770935,-0.011619568,-0.020431519,-0.026229858,0.027648926,0.014228821,-0.006828308,-0.018157959,0.034942627,-0.032043457,-0.017242432,0.028717041,0.041412354,-0.0017776489,0.03152466,-0.021942139,0.007987976,-0.020446777,-0.0016956329,-0.0126571655,0.0064048767,0.0034122467,0.012138367,-0.0007929802,0.0054893494,0.020874023,-0.012123108,0.009963989,0.035949707,0.011886597,-0.009613037,0.03173828,0.010795593,0.008010864,-0.015930176,0.00056266785,0.022598267,0.046051025,0.007598877,0.01209259,-0.014556885,0.005027771,-0.01789856,0.011161804,0.018447876,-0.026657104,-0.048217773,-0.014411926,-0.032226562,0.024917603,-0.0011634827,0.00031495094,-0.015220642,0.01398468,-0.016204834,-0.02859497,-0.021621704,0.032409668,0.0129776,-0.018539429,-0.008293152,0.013038635,0.016738892,-0.02885437,-0.00077962875,-0.052093506,-0.033721924,-0.013427734,-0.017623901,0.027816772,0.004558563,-0.008018494,-0.002576828,-0.0038089752,-0.002231598,0.001373291,0.025146484,-0.012191772,-0.006500244,0.02053833,0.02583313,-0.021133423,0.024841309,-0.007801056,0.0029678345,0.0075645447,-0.0042266846,0.005077362,-0.026290894,0.029342651,-0.015899658,-0.005672455,0.031951904,-0.0036067963,0.0184021,-0.034851074,0.0015144348,-0.0010347366,-0.008613586,0.045196533,-0.029159546,-0.02128601,0.010406494,-0.020629883,-0.021438599,0.0035514832,0.014373779,0.025405884,-0.0023155212,0.052947998,-0.0059051514,-0.0041275024,0.014167786,0.0055007935,-0.015388489,0.009124756,0.025161743,0.0027256012,-0.00088214874,-0.006958008,-0.015510559,-0.024993896,-0.0005950928,0.017593384,-0.0063552856,-0.01727295,0.03186035,0.014320374,0.049438477,-0.009460449,0.0256958,0.013824463,0.008659363,0.03062439,0.00015807152,0.0519104,-0.0056419373,-0.031143188,0.004196167,0.00068616867,-0.02130127,0.016464233,-0.0010223389,0.00082063675,-0.048858643,0.014831543,0.000028669834,0.018707275,-0.008911133,0.008239746,-0.025161743,-0.013092041,-0.037322998,-0.0036201477,-0.039916992,-0.0023670197,0.036468506,0.012756348,0.030731201,-0.0022716522,-0.024642944,0.022155762,0.051940918,0.0011930466,-0.022949219,-0.020507812,0.009674072,0.0056610107,0.018218994,0.0058937073,-0.019073486,-0.021408081,0.0087890625,-0.010070801,0.010017395,-0.010101318,0.016433716,0.012680054,-0.004776001,-0.01777649,0.029953003,-0.0060424805,-0.0053215027,0.010368347,0.0028572083,0.034057617,0.03152466,-0.020401001,0.02003479,0.016433716,-0.04550171,0.06567383,-0.004081726,0.031433105,-0.013877869,0.007297516,-0.035888672,-0.028671265,-0.019927979,0.006828308],"createdAt":"2026-04-18T18:58:27.352Z","updatedAt":"2026-04-23T06:31:34.340Z","lastSeenAt":"2026-04-23T06:31:34.340Z","tsv":"'/api':168 '/api/v1/transactions/125':84,216 '/docs':167 '/pricing':169 '/readme':171 '/request':13,28 '0.02':12,27,59,106 '000':100 '20':99 '402':204 '402 payment protocol' '6':110 'Base network API' 'USDC API' 'access':90 'advertis':116 'ai':126 'ai-inference' 'ai/ml':49 'analysi':130 'analyt':48,120 'api':5,20,37,71,89 'appear':154 'avail':198 'base':8,23,67,101,113 'broad':42 'call':4,19 'captur':206 'categori':117 'challeng':95,205 'classif':133 'classification' 'collect':43 'commit':79 'confirm':202 'connect':177 'convers':150 'cost':58 'crypto API access' 'crypto-quotes' 'data':47,52,119,123 'data-analytics' 'decim':111 'detail':184 'document':162,193,209 'embed':134 'embeddings' 'enabl':36 'endpoint':45,57,82,153,200,217 'estim':144 'everi':56 'exampl':196 'exchang':139 'expect':218 'export':124 'extrem':164 'feed':138 'financ':135 'finance-data' 'finance/web3':51 'follow':156 'gas':143 'generat':151 'geocod':148 'geocoding' 'i.e':105 'includ':118 'infer':50 'infrastructur':146 'input':214 'insight':125 'key':72 'learn':128 'limit':75 'list':86 'live':203 'low payment fee' 'lowpaymentfee.com':31 'machin':127 'metric':121 'micropayment API' 'model':161 'network':9,24,68 'no-api-key' 'offer':40 'openapi':188 'page':172 'paid':62 'pay':2,17 'pay per call API' 'pay-per-cal':1,16 'pay-per-request' 'payload':197 'payment':160 'per':3,18,60 'platform':6,21,38,115 'premium':88 'price':137 'prompt':179 'quot':142 'rate':74,140 'render':174 'report':122 'request':61,96 'request/response':191 'return':92,222 'schema':192 'sentiment':129 'sentiment-analysis' 'servic':55 'sinc':107 'span':46 'spars':165 'spec':189 'specif':81 'summar':132 'technic':183 'text':131 'text-summarization' 'token':141 'unclear':212 'unit':102 'upfront':78 'usdc':15,30,64,104,108 'usdc-base-network' 'use':109 'util':54,147 'utility-services' 'valid':149 'via':10,25 'wallet':178 'web3':136 'without':208 'x402':11,26,35,94,159 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bb6d8895-2762-48cf-93c6-14e3944d2175","listingId":"d6a8deb7-2e7b-4046-93f6-3894bfb6273e","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:27.352Z"}],"sources":[{"listingId":"d6a8deb7-2e7b-4046-93f6-3894bfb6273e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/125","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:27.352Z","lastSeenAt":"2026-04-23T06:31:34.340Z"}],"details":{"listingId":"d6a8deb7-2e7b-4046-93f6-3894bfb6273e","quickStartSnippet":"# The endpoint returns a 402 challenge; pay via x402 protocol\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/125 \\\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":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/125"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/125"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto quotes with per-request USDC micropayments","Running utility operations like geocoding, validation, and data conversion on demand","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Developers wanting zero-friction API access without signup or API keys","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost per-request pricing with no minimum commitment"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.044Z"},"updatedAt":"2026-04-23T06:31:34.340Z"}}