{"id":"f6f9fe5c-8d53-48b7-ab2e-63a17621318c","shortId":"rXaPBb","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/199` is listed as \"Premium API Access\" and carries a maxAmountRequired of 20,000 base units of USDC (0.02 USDC = $0.02), consistent with the site-wide pricing. The x402 challenge was captured live (version 1, scheme \"exact\", asset 0x8335…2913 which is USDC on Base). Payment is sent to address 0x1A2B…85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints in four categories: Data & Analytics (metrics, reports, 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). However, documentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There are no OpenAPI specs, request/response schemas, or usage examples available from the crawl. The actual behavior and response format of this specific transactions endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats","The specific purpose and expected input/output of /api/v1/transactions/199 is undocumented","No information on uptime, SLAs, or rate limits beyond marketing claims of 'no rate limits'","Platform appears to be a demonstration or early-stage project with minimal operational detail"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/199","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/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The /docs, /pricing, /api, and /README pages are all empty beyond a wallet-connect prompt. The purpose of this specific '/transactions/199' endpoint is unclear beyond the generic 'Premium API Access' label.","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":"2026-04-19T12:19:51.902Z","embedding":[-0.02696228,-0.035308838,0.045013428,0.018127441,0.016174316,-0.031433105,-0.028060913,0.026992798,0.062408447,-0.05947876,0.030685425,-0.05001831,-0.036071777,-0.036865234,-0.015823364,0.011016846,0.0017490387,0.009483337,-0.041229248,0.031402588,0.019851685,-0.022918701,-0.030059814,0.014175415,-0.011123657,-0.019515991,-0.004135132,-0.0034275055,-0.017791748,-0.04547119,0.039855957,-0.025619507,-0.0008687973,0.012382507,-0.01084137,-0.004863739,0.001373291,0.03656006,0.02949524,-0.014831543,0.0006685257,-0.061279297,0.0023555756,-0.015930176,-0.054595947,0.0039787292,0.010147095,-0.028030396,0.010902405,0.0069770813,-0.040740967,-0.005256653,-0.011558533,-0.0019779205,0.0044288635,0.016189575,0.0022201538,0.0026493073,0.011352539,0.0036239624,-0.018859863,-0.06726074,-0.0129776,-0.0102005005,-0.003917694,0.06359863,-0.00491333,0.04257202,0.0009393692,0.06707764,0.03137207,0.05014038,0.036102295,0.011451721,0.0068244934,-0.0021095276,-0.01940918,0.062347412,-0.014152527,-0.030349731,0.0034675598,-0.01751709,-0.06201172,-0.004016876,-0.008171082,-0.047790527,-0.020065308,0.028915405,-0.026489258,0.02973938,-0.071777344,-0.0035877228,-0.0052871704,-0.0010690689,0.007335663,-0.008583069,-0.015029907,0.01927185,-0.0044555664,0.016281128,-0.0032367706,-0.049346924,0.029388428,0.017425537,0.03604126,0.040740967,0.021621704,0.027267456,0.0073623657,-0.0014305115,-0.024261475,0.013076782,-0.004634857,-0.013710022,0.01486969,0.012680054,-0.021606445,0.018920898,-0.028274536,0.019042969,-0.043640137,0.053833008,0.00844574,0.010757446,0.005241394,-0.04348755,-0.019104004,0.015792847,-0.031463623,-0.0027275085,0.018661499,0.016296387,0.027832031,-0.015029907,-0.029251099,0.008460999,-0.013458252,0.005180359,-0.053497314,-0.037902832,0.042175293,-0.025177002,0.02279663,0.050201416,-0.0993042,-0.0093688965,-0.04269409,0.014778137,-0.030456543,-0.015090942,0.0029411316,0.019714355,-0.023788452,-0.017211914,-0.023834229,-0.031921387,-0.005203247,0.041229248,-0.0048561096,0.032928467,-0.02960205,0.02758789,0.009361267,0.009269714,0.015556335,0.02999878,-0.0011997223,-0.07409668,-0.08850098,-0.026641846,-0.0014915466,-0.031921387,-0.030395508,0.015159607,-0.011390686,-0.085998535,-0.022277832,-0.015556335,-0.009666443,-0.037902832,-0.01374054,-0.029953003,0.020050049,-0.008956909,-0.053863525,-0.022247314,-0.034576416,0.059753418,0.033111572,0.027908325,0.026168823,-0.006164551,0.05517578,0.03540039,-0.009597778,-0.011306763,0.015777588,-0.023895264,0.02532959,-0.0038967133,0.022415161,-0.02406311,0.037902832,0.07470703,-0.0052757263,-0.032348633,-0.01134491,-0.053375244,-0.0473938,-0.037261963,0.019454956,0.0044822693,-0.0029354095,0.03125,-0.033813477,-0.030883789,-0.009239197,0.016311646,0.015548706,0.0635376,0.009773254,-0.008659363,0.04046631,0.010360718,-0.06097412,0.04055786,0.0368042,0.015670776,-0.029556274,-0.049621582,0.037017822,0.042266846,-0.028015137,0.022201538,-0.01209259,0.02708435,-0.0025100708,0.0072402954,0.012992859,-0.011703491,-0.027297974,-0.017410278,-0.005897522,0.029159546,0.011634827,-0.02230835,-0.030899048,-0.08721924,0.0446167,0.03878784,0.03366089,-0.00983429,-0.0020389557,-0.019515991,-0.010719299,-0.07293701,0.060638428,0.07476807,-0.00019466877,-0.013961792,0.03060913,-0.009666443,-0.035003662,0.010299683,-0.019607544,-0.03149414,-0.009010315,0.018875122,-0.041625977,-0.00856781,0.022323608,0.017944336,0.04727173,-0.014007568,-0.050842285,-0.02331543,-0.00484848,0.0066337585,-0.03881836,-0.0023937225,0.0038604736,0.01838684,0.025604248,0.0013151169,0.010665894,-0.0010633469,0.0009918213,-0.003019333,0.008880615,-0.017715454,-0.024368286,0.018157959,0.0071411133,-0.054595947,0.008094788,-0.007446289,0.064819336,-0.042816162,0.03857422,-0.013885498,0.022750854,0.054229736,0.0012292862,-0.04650879,0.010772705,0.039093018,0.019760132,0.041381836,0.021392822,-0.025848389,-0.010032654,0.08526611,-0.00033450127,-0.0047302246,0.0022945404,0.00491333,0.0446167,-0.01651001,-0.058258057,-0.038726807,-0.0017518997,-0.03643799,0.024276733,-0.0234375,0.027267456,-0.006164551,0.002412796,-0.02458191,-0.0064888,-0.03010559,0.012672424,-0.005607605,0.015266418,-0.020980835,-0.027053833,0.017486572,0.009269714,-0.019927979,0.008201599,0.049316406,0.015716553,-0.010971069,-0.028808594,-0.041992188,-0.0030288696,-0.0076942444,0.013397217,0.020843506,0.014625549,0.048034668,-0.03479004,-0.010955811,0.011932373,0.0075531006,0.040618896,-0.0006980896,0.00020444393,-0.061706543,-0.05130005,-0.027511597,-0.0418396,0.027374268,0.030380249,-0.010925293,0.05355835,0.0071372986,-0.026306152,-0.027313232,0.015411377,-0.04260254,0.005168915,0.050109863,-0.008560181,-0.02973938,0.015823364,-0.002981186,0.001036644,0.03866577,0.015731812,0.032165527,0.06958008,0.032073975,0.0138168335,0.02067566,0.0016355515,0.033050537,0.012588501,-0.023666382,-0.031921387,-0.02583313,0.029876709,-0.026306152,-0.014480591,-0.059539795,0.051940918,0.03451538,0.097473145,0.023849487,0.0065078735,0.038970947,-0.008705139,0.01146698,-0.022445679,-0.035583496,-0.034210205,-0.0357666,0.025680542,-0.01121521,-0.0048294067,-0.013809204,0.03869629,0.005783081,0.014892578,-0.026641846,0.042144775,-0.013038635,-0.008605957,0.022476196,0.015731812,0.048309326,0.057556152,-0.038116455,0.020370483,0.02078247,-0.039001465,0.0014247894,0.040649414,-0.011520386,-0.010803223,-0.05078125,-0.025299072,-0.0075531006,-0.011619568,-0.044006348,-0.0079574585,0.0047073364,0.024353027,0.034118652,-0.008094788,-0.01625061,-0.0069885254,-0.010864258,-0.044525146,-0.0016374588,-0.039093018,-0.000100016594,0.03918457,-0.022567749,0.003452301,-0.00011634827,-0.0030612946,-0.0062675476,0.0061531067,0.029678345,-0.011329651,-0.054901123,0.039276123,-0.004070282,0.007987976,0.004875183,0.030136108,0.02798462,0.031829834,0.042388916,0.011726379,-0.011703491,-0.059570312,0.012992859,-0.039123535,0.0060539246,0.023345947,-0.025604248,-0.00044965744,-0.0061187744,-0.028671265,-0.020446777,0.0137786865,-0.029312134,0.0023059845,0.02128601,-0.018417358,-0.029876709,-0.062438965,-0.01675415,-0.0082473755,0.053222656,0.025680542,0.005580902,-0.059417725,-0.011070251,0.021865845,0.0057754517,0.036193848,-0.0151901245,0.0009784698,-0.012397766,-0.033081055,-0.012458801,-0.02734375,0.025390625,-0.00056266785,0.0012569427,0.015464783,0.004962921,0.013847351,0.0104904175,0.0099487305,0.02027893,-0.018981934,-0.0002772808,-0.0072631836,0.0309906,0.016433716,-0.0072631836,-0.045806885,0.040618896,0.003862381,0.034210205,-0.038757324,-0.0035800934,-0.008590698,0.0063972473,0.015052795,-0.014060974,-0.0074424744,-0.014671326,-0.047180176,-0.062683105,0.041229248,-0.018463135,0.03793335,0.024154663,0.00057935715,0.026885986,-0.016998291,-0.0034942627,0.023757935,-0.021087646,-0.006816864,-0.022827148,-0.037017822,-0.018188477,-0.019119263,-0.031951904,0.02330017,-0.0154953,0.012794495,0.0012607574,-0.025054932,0.02758789,0.0012931824,0.00041365623,0.017822266,0.0019435883,0.019607544,0.03982544,0.015037537,-0.041046143,0.014961243,0.00034856796,0.0011863708,-0.008430481,0.041778564,0.023590088,-0.0079956055,-0.014152527,-0.014335632,-0.016296387,-0.028457642,0.009544373,0.0024375916,-0.00069475174,0.0032291412,-0.02557373,0.008453369,0.004470825,-0.031921387,-0.028778076,0.011604309,0.009605408,-0.032989502,0.022399902,0.030273438,0.047973633,-0.014274597,0.008857727,-0.0021858215,0.04724121,0.034729004,0.010917664,-0.009933472,0.01864624,-0.009025574,0.01524353,-0.0055770874,-0.014167786,0.022018433,0.005355835,0.019927979,0.022903442,0.010040283,-0.023864746,-0.032318115,-0.0021781921,-0.016357422,-0.029571533,0.025787354,0.016204834,0.031402588,-0.028671265,0.016906738,0.0073547363,-0.013290405,-0.017730713,-0.017211914,0.034240723,-0.008415222,-0.003900528,0.0206604,0.016098022,0.018218994,-0.060760498,-0.0040740967,0.0047836304,0.0071144104,-0.01335907,-0.04837036,-0.039398193,0.005153656,0.040374756,0.01033783,0.03189087,0.030578613,-0.0004541874,0.005569458,0.024108887,-0.010223389,-0.010612488,-0.006706238,-0.055236816,-0.01991272,-0.0053253174,0.008598328,-0.036590576,0.015945435,-0.0013303757,-0.024139404,0.0012321472,-0.015625,-0.002506256,-0.018295288,0.015464783,0.048950195,0.0073280334,0.017791748,-0.013656616,-0.032165527,-0.0005044937,0.010940552,0.013145447,-0.044311523,0.02670288,-0.01309967,-0.011070251,0.0053863525,0.013671875,0.026504517,0.019073486,0.018692017,0.040863037,-0.043273926,0.05633545,-0.02935791,0.0231781,-0.0013790131,-0.03817749,-0.01550293,-0.025619507,-0.00957489,0.04055786,-0.02935791,-0.008392334,-0.035217285,-0.035583496,-0.010261536,-0.056121826,0.019958496,0.03286743,0.039855957,-0.022766113,-0.000022947788,0.00039815903,0.01399231,-0.018676758,0.010620117,-0.020263672,0.021850586,0.026123047,-0.001663208,-0.031341553,-0.029663086,-0.015625,-0.0034389496,-0.052886963,-0.055603027,-0.008453369,0.0026931763,-0.0096206665,-0.0033798218,-0.027145386,-0.030578613,-0.0029010773,-0.042999268,0.014175415,-0.000056266785,0.02255249,0.0050354004,-0.021835327,-0.0042877197,0.0044822693,-0.014640808,0.034454346,0.0047721863,0.0009608269,-0.049316406,0.012519836,0.010261536,0.022262573,-0.011047363,-0.024658203,-0.008964539,-0.018432617,-0.051452637,-0.0066986084,-0.0070610046,-0.01499939,-0.013458252,0.0008430481,-0.054382324,-0.0025749207,-0.029464722,-0.006412506,0.018676758,0.012550354,0.012649536,-0.0070228577,0.01914978,-0.0087890625,-0.011985779,-0.030670166,0.008094788,0.01108551,0.0069351196,0.022567749,0.05505371,0.00079631805,-0.028305054,0.006538391,0.004901886,0.016601562,-0.019699097,0.010910034,-0.021636963,0.01574707,-0.008094788,-0.013252258,-0.03866577,-0.0064735413,0.07397461,-0.0021343231,-0.017730713,-0.010307312,-0.01826477,0.015899658,0.042266846,-0.03945923,-0.0062332153,-0.025634766,0.019958496,-0.018447876,0.0064849854,0.0023288727,0.018936157,-0.01309967,-0.05050659,-0.020370483,-0.01171875,-0.01701355,-0.062683105,-0.031921387,-0.07446289,0.0104599,-0.016540527,-0.027420044,0.0023326874,0.013885498,-0.014427185,-0.08514404,-0.009376526,0.056884766,0.0028038025,0.034210205,-0.012420654,0.019729614,0.040771484,-0.028671265,0.0034255981,0.02053833,-0.033050537,-0.018157959,-0.023117065,0.017074585,-0.015701294,-0.0067825317,0.0043029785,0.011650085,0.014671326,-0.007156372,0.015426636,-0.012748718,0.024124146,-0.008544922,0.01020813,-0.018096924,-0.010887146,0.039916992,-0.049804688,0.027908325,0.011810303,-0.008880615,0.010917664,0.044036865,0.042785645,-0.038116455,-0.016357422,0.018920898,0.013885498,0.031555176,-0.021881104,0.05532837,0.010871887,-0.0131073,0.012130737,-0.022003174,-0.007980347,-0.022109985,-0.029769897,0.02017212,0.004802704,0.01424408,-0.025848389,-0.006248474,0.017074585,0.012367249,0.0067863464,-0.0078048706,-0.024810791,-0.030075073,0.005558014,0.0048065186,0.0017957687,0.0038890839,0.030532837,0.018600464,0.03604126,0.014312744,-0.02558899,-0.0024032593,0.032958984,-0.008964539,-0.00038266182,0.03564453,0.007785797,0.014762878,0.022354126,0.014778137,-0.059906006,-0.013710022,-0.022888184,-0.016952515,-0.0063934326,-0.017166138,-0.018325806,-0.008811951,0.0033073425,-0.0121154785,-0.034851074,-0.003112793,-0.03201294,-0.025100708,0.0013198853,-0.013618469,0.029067993,0.009765625,0.009727478,0.0027503967,-0.007987976,0.0368042,-0.003917694,-0.013923645,0.035583496,0.027633667,0.017486572,-0.0317688,-0.008918762,-0.012306213,-0.0137786865,-0.00028300285,-0.035858154,0.014816284,0.042755127,-0.018417358,0.0014457703,0.006324768,0.02532959,-0.010818481,0.0028743744,-0.012298584,0.017288208,-0.008277893,0.032287598,-0.050720215,0.02722168,0.009742737,0.0001411438,-0.014732361,-0.015914917,-0.02960205,0.022216797,-0.0033245087,-0.008857727,0.04736328,0.016662598,0.029342651,-0.020874023,-0.018554688,-0.0008735657,-0.026504517,-0.021606445,0.019378662,-0.014472961,0.0025978088,0.016052246,-0.02748108,0.036499023,-0.038909912,0.012535095,0.006336212,0.0021762848,-0.002840042,-0.014221191,-0.005870819,-0.0073280334,-0.013267517,0.0017223358,-0.00497818,0.047058105,0.029876709,0.02960205,0.04888916,0.01878357,0.0046463013,-0.041534424,-0.028564453,0.0050239563,-0.010116577,0.019226074,-0.012512207,0.055480957,0.034301758,0.0012722015,0.046966553,0.034118652,0.040527344,0.0012712479,0.011932373,-0.019744873,0.015388489,-0.013313293,0.022842407,-0.0018100739,0.033294678,-0.029464722,0.016021729,0.017074585,0.01828003,-0.019165039,0.03643799,0.070495605,0.017074585,-0.0073547363,0.03555298,0.0009498596,-0.0031051636,-0.005264282,-0.023513794,0.046569824,-0.002735138,0.04888916,0.04559326,0.012809753,0.00035977364,0.02267456,-0.0317688,-0.021392822,0.058502197,0.031982422,-0.0262146,-0.015213013,-0.009162903,0.004837036,-0.048583984,-0.020690918,0.009849548,-0.011398315,0.005504608,-0.004966736,-0.010955811,-0.017623901,0.0047302246,0.017593384,0.014099121,-0.0078125,0.027130127,0.032806396,-0.0019445419,0.025894165,-0.00070238113,0.027038574,-0.020523071,-0.02835083,0.024475098,0.027053833,-0.007827759,-0.0049438477,0.03149414,-0.0007863045,0.037322998,0.03829956,-0.03274536,0.008415222,0.029129028,0.008293152,0.0027580261,0.053100586,0.041900635,0.017410278,0.035736084,0.031677246,0.04034424,-0.034820557,0.024658203,-0.002462387,-0.000562191,-0.008850098,-0.002368927,0.0034885406,-0.00957489,0.027175903,-0.0017623901,-0.018295288,0.02027893,0.021499634,-0.006626129,-0.01171875,-0.0012903214,0.013404846,-0.023361206,0.0015869141,0.013038635,-0.013572693,0.0362854,0.009590149,0.02078247,-0.01878357,0.020980835,-0.0014715195,-0.0154953,-0.00039434433,0.026016235,-0.04135132,-0.0054779053,-0.008735657,0.0044288635,-0.0519104,0.0057868958,0.02331543,-0.009033203,0.024429321,0.013710022,-0.005241394,-0.010894775,0.03604126,0.01235199,-0.004589081,-0.006389618,-0.026748657,0.022003174,0.03604126,0.002418518,0.0071372986,-0.020370483,-0.010627747,0.0038928986,-0.00806427,0.0009551048,-0.0038108826,-0.016906738,-0.015266418,0.025100708,0.028640747,0.023223877,0.049346924,-0.018966675,-0.012084961,0.010643005,0.041168213,0.008956909,0.00004929304,-0.0008430481,0.021881104,-0.022872925,0.040161133,0.044433594,0.010719299,0.03753662,0.0042037964,-0.017227173,0.01020813,-0.017211914,0.029953003,-0.0079574585,0.00217247,-0.00049209595,0.029968262,-0.015396118,-0.031951904,0.0036468506,-0.013885498,-0.02583313,-0.017105103,0.015388489,-0.00007021427,0.027908325,0.04269409,0.022445679,-0.021713257,0.059692383,-0.009506226,0.035064697,0.007472992,-0.015777588,0.052947998,0.013809204,0.04034424,0.01727295,0.003293991,-0.036865234,0.021347046,0.030639648,0.020889282,0.012825012,0.0055885315,-0.016784668,0.032806396,-0.004951477,0.038391113,-0.0076675415,0.0047035217,0.013961792,-0.0048332214,-0.0055770874,-0.0060653687,-0.0013198853,0.0050239563,0.05255127,-0.02355957,-0.0045814514,-0.024108887,-0.008659363,0.024887085,-0.008331299,0.0016441345,-0.006454468,-0.020339966,0.013168335,-0.028915405,-0.022125244,0.014015198,0.027770996,-0.05307007,-0.012069702,0.011192322,0.027191162,-0.023864746,0.029129028,0.019638062,-0.0036411285,0.00730896,0.041381836,-0.011566162,0.02508545,-0.010185242,0.033203125,0.029342651,0.010902405,-0.02279663,-0.00017106533,0.00957489,-0.009880066,0.011123657,0.033294678,-0.024307251,0.0037841797,-0.0074806213,-0.003917694,-0.007083893,0.0063667297,-0.016601562,0.010940552,-0.005279541,-0.008872986,0.008888245,0.008018494,-0.0052604675,0.004371643,0.0028476715,-0.01436615,0.014694214,0.032684326,0.016738892,-0.024871826,-0.005634308,0.007068634,0.0072021484,-0.022003174,-0.0079422,-0.0009498596,-0.034698486,0.013633728,0.01184845,0.010528564,0.012016296,-0.03125,-0.006374359,0.021697998,0.0055160522,0.019256592,0.0060424805,-0.0029582977,0.014480591,-0.008529663,-0.005935669,-0.008987427,-0.011047363,0.01625061,0.024490356,-0.0072669983,-0.026397705,0.014945984,-0.0032234192,0.016921997,0.005191803,-0.014175415,0.014373779,-0.011352539,-0.0039787292,0.004333496,0.012832642,-0.011932373,-0.010940552,-0.0071868896,0.03161621,0.055908203,-0.012840271,-0.012359619,0.024368286,0.023391724,0.023025513,0.04257202,0.005771637,0.040985107,0.026367188,-0.023590088,-0.022064209,0.023345947,-0.0102005005,-0.029663086,0.013702393,-0.0065460205,-0.012817383,0.025131226,0.015090942,0.0035171509,-0.032073975,-0.00047159195,-0.011894226,-0.0138168335,0.00843811,-0.010574341,0.015899658,-0.023132324,-0.01335144,0.014259338,-0.028198242,-0.045318604,-0.013381958,-0.0017757416,-0.008094788,-0.052337646,0.0017271042,-0.021484375,0.005634308,-0.025939941,-0.00036263466,-0.010139465,0.011398315,-0.016845703,-0.0152282715,-0.00013399124,0.024810791,0.022888184,0.003068924,0.018218994,-0.030960083,-0.016235352,-0.031555176,0.009590149,-0.017623901,0.02848816,0.0045051575,0.03186035,0.028747559,-0.01474762,-0.0038394928,-0.013366699,-0.006980896,-0.018356323,-0.014656067,-0.022476196,0.026290894,0.016220093,-0.010856628,-0.011138916,0.04168701,-0.025634766,-0.012542725,0.025787354,0.035736084,0.0032482147,0.032684326,-0.016418457,0.0011119843,-0.017059326,-0.0037403107,-0.013870239,-0.0014801025,0.0078048706,0.010574341,-0.002916336,0.0068893433,0.016983032,-0.014122009,0.0030593872,0.035247803,0.00484848,-0.00957489,0.036071777,0.00737381,0.0024337769,-0.016296387,-0.004737854,0.023254395,0.049926758,0.009536743,0.009483337,-0.016738892,0.0032024384,-0.0158844,0.011734009,0.018218994,-0.02267456,-0.051330566,-0.019836426,-0.03488159,0.028549194,-0.004310608,0.006855011,-0.007904053,0.022216797,-0.014984131,-0.025894165,-0.020477295,0.031951904,0.011726379,-0.013618469,-0.006252289,0.014122009,0.020050049,-0.034942627,-0.0054512024,-0.042053223,-0.030380249,-0.015197754,-0.013427734,0.023544312,0.007686615,-0.0014648438,-0.0018968582,-0.008712769,0.001701355,0.0027828217,0.02029419,-0.017105103,-0.0018405914,0.022949219,0.024261475,-0.022888184,0.029205322,-0.010612488,-0.001420021,0.009216309,-0.010795593,0.01763916,-0.022094727,0.032409668,-0.011138916,-0.00000590086,0.03604126,-0.00932312,0.011436462,-0.032226562,0.0007100105,-0.00030875206,-0.0047302246,0.0390625,-0.02079773,-0.011619568,0.011230469,-0.024627686,-0.03074646,0.0038070679,0.016784668,0.027404785,-0.0006594658,0.055236816,-0.0071754456,-0.0060272217,0.02381897,0.010292053,-0.020477295,0.0031394958,0.030578613,0.0018234253,0.012962341,0.00015354156,-0.012435913,-0.024108887,-0.009010315,0.016708374,-0.0032043457,-0.013046265,0.030685425,0.023635864,0.041748047,-0.011367798,0.029708862,0.017578125,0.005493164,0.026123047,0.0038871765,0.048858643,-0.0061531067,-0.027923584,0.0023288727,0.0018157959,-0.022567749,0.012588501,0.0013885498,0.0052337646,-0.043792725,0.010406494,0.0016584396,0.019165039,-0.018569946,0.010040283,-0.021865845,-0.010917664,-0.039245605,-0.008140564,-0.037139893,0.007801056,0.037261963,0.011360168,0.035461426,-0.0021419525,-0.025726318,0.020401001,0.051818848,-0.00066137314,-0.028945923,-0.019256592,0.008956909,0.004020691,0.0074272156,0.0071411133,-0.009521484,-0.017227173,0.006980896,-0.0060424805,0.012466431,-0.005519867,0.013366699,0.0121536255,-0.00052785873,-0.016647339,0.025802612,-0.0061798096,-0.0063705444,0.0154418945,-0.0017576218,0.029708862,0.028564453,-0.01574707,0.022399902,0.013252258,-0.050476074,0.065979004,-0.0032100677,0.032226562,-0.01524353,0.01828003,-0.0357666,-0.030822754,-0.022613525,0.0069503784],"createdAt":"2026-04-18T18:59:01.251Z","updatedAt":"2026-04-22T13:31:46.815Z","lastSeenAt":"2026-04-22T13:31:46.815Z","tsv":"'/api':200 '/api/v1/transactions/199':96 '/docs':199 '/pricing':201 '/readme':203 '/request':13,28 '0.02':12,27,64,114,116 '000':109 '0x1a2b':147 '0x8335':135 '1':131 '20':108 '2913':136 '300':151 '85f3':148 'access':102 'account':76 'actual':232 'address':146 'advertis':157 'ai':168 'ai-inference' 'ai/ml':49 'analysi':172 'analyt':48,163 'api':5,20,37,74,101 'asset':134 'attach':84 'avail':227 'base':8,23,71,110,141 'base network api' 'behavior':233 'broad':42 'broader':155 'call':4,19 'caller':82 'captur':128 'carri':104 'categori':161 'challeng':126 'classif':175 'classification' 'connect':209 'consist':117 'convers':191 'crawl':230 'crypto-data' 'data':47,52,162 'data-analytics' 'detail':216 'document':194 'embed':176 'embeddings' 'enabl':36 'endpoint':45,57,94,158,241 'estim':186 'exact':133 'exampl':226 'exchang':181 'export':166 'extrem':196 'feed':180 'financ':177 'finance-data' 'finance/web3':51 'format':236 'four':160 'gas':185 'generat':192 'geocod':189 'geocoding' 'header':88 'howev':193 'infer':50 'infrastructure/utilities':188 'insight':167 'key':75 'learn':170 'limit':79 'list':98 'live':129 'low payment fee' 'lowpaymentfee.com':31 'machin':169 'maxamountrequir':106 'metric':164 'micropayment api' 'network':9,24,72 'no-auth api' 'offer':40 'openapi':220 'page':204 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,142 'per':3,18,61 'platform':6,21,38,156 'premium':100 'price':123,179 'prompt':211 'quot':184 'rate':78,182 'render':206 'report':165 'request':62,91 'request/response':222 'requir':81 'respons':235 'schema':223 'scheme':132 'second':152 'sent':144 'sentiment':171 'sentiment-analysis' 'servic':55 'set':43 'settl':66 'simpli':83 'site':121 'site-wid':120 'span':46 'spec':221 'specif':93,239 'summar':174 'technic':215 'text':173 'text-summarization' 'thin':197 'timeout':153 'token':183 'transact':240 'unit':111 'unknown':243 'usag':225 'usdc':15,30,68,113,115,139 'usdc api' 'usdc-base' 'util':54 'utility-services' 'valid':190 'version':130 'via':10,25 'wallet':210 'web3':178 'wide':122 'x402':11,26,35,86,125 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"df551dfa-d05d-47db-b5a4-d034eed78b63","listingId":"f6f9fe5c-8d53-48b7-ab2e-63a17621318c","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/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:01.251Z"}],"sources":[{"listingId":"f6f9fe5c-8d53-48b7-ab2e-63a17621318c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:01.251Z","lastSeenAt":"2026-04-22T13:31:46.815Z"}],"details":{"listingId":"f6f9fe5c-8d53-48b7-ab2e-63a17621318c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/199 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/199"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto gas estimates, token quotes, or exchange rates via micropayment","Running geocoding or data validation calls with per-request billing and no subscription"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-commitment, no-subscription API access","Web3-native applications already operating on Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.405Z"},"updatedAt":"2026-04-22T13:31:46.815Z"}}