{"id":"2292ec43-30d7-469b-b443-f208ee2e820e","shortId":"xDUGqp","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with each request.\n\nThe specific endpoint at `/api/v1/carts/99` is listed as \"Premium API Access\" and requires up to 20,000 units of USDC (0.02 USDC given 6 decimals) per call. The platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and response format of `/api/v1/carts/99` is unclear from available materials.","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-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay per request API","x402 API","USDC API payment","micropayment API","Base network API","low fee API","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content","The specific endpoint /api/v1/carts/99 is labeled 'Premium API Access' but its actual function is undocumented","Cannot verify what data or service this specific endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/99","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/carts/99","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 confirms the endpoint accepts POST with USDC on Base at ~$0.02. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/carts/99 is unclear. The docs, pricing, and README pages are all empty wallet-connect stubs.","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":"2026-04-18T19:53:37.005Z","embedding":[-0.02558899,-0.024551392,0.006542206,0.012123108,0.040649414,-0.029571533,-0.040039062,0.032562256,0.06628418,-0.06695557,0.02758789,-0.05517578,-0.036132812,-0.03289795,-0.007843018,0.003036499,0.01171875,0.002538681,-0.02861023,0.047180176,0.040771484,-0.014678955,-0.033721924,0.015045166,-0.0003607273,-0.018249512,0.01335144,0.0067367554,-0.010391235,-0.04324341,0.016616821,-0.035827637,-0.00522995,0.008995056,-0.008308411,-0.0011548996,0.010322571,0.03527832,0.02911377,-0.00573349,-0.002603531,-0.06329346,0.011169434,-0.01689148,-0.056030273,-0.0077400208,0.01637268,-0.027069092,-0.00071287155,-0.0030727386,-0.0519104,0.003862381,-0.015655518,0.008811951,-0.012687683,0.009811401,-0.011482239,0.0022201538,0.0128479,0.008293152,-0.007003784,-0.055755615,-0.008842468,-0.024841309,0.0061187744,0.05026245,-0.0050582886,0.03161621,0.008979797,0.08239746,0.029037476,0.030258179,0.02217102,-0.00819397,-0.0001758337,-0.019927979,-0.01927185,0.064819336,-0.015258789,-0.021133423,-0.013725281,-0.0007047653,-0.04827881,-0.04046631,-0.021102905,-0.07543945,-0.024169922,0.02293396,-0.03012085,0.018875122,-0.08001709,-0.006668091,-0.012992859,-0.0033664703,0.008018494,-0.0024147034,-0.012954712,0.016326904,-0.0009403229,0.011955261,-0.0067100525,-0.04724121,0.019607544,0.0071640015,0.054473877,0.05722046,0.00497818,0.014923096,0.0062713623,-0.030822754,-0.037475586,0.0079956055,-0.036254883,-0.0017385483,0.004196167,0.003604889,-0.026306152,0.0022792816,-0.019561768,0.016860962,-0.05935669,0.059326172,0.02368164,0.001543045,-0.00844574,-0.050811768,-0.024642944,0.0022296906,-0.02357483,-0.002325058,0.016448975,0.005207062,0.01876831,-0.027191162,-0.0362854,0.0154800415,-0.021255493,-0.006095886,-0.060668945,-0.018157959,0.044067383,-0.03970337,0.016860962,0.03414917,-0.09436035,-0.015419006,-0.030731201,0.01096344,-0.034942627,-0.015045166,0.003435135,0.040039062,-0.013336182,-0.03616333,-0.019439697,-0.028030396,-0.0079422,0.03945923,-0.012306213,0.032714844,-0.018814087,0.011444092,-0.0051994324,0.008644104,-0.0009250641,0.021224976,-0.00831604,-0.07299805,-0.0847168,-0.023208618,-0.0060691833,-0.017593384,-0.022201538,0.0066184998,0.01260376,-0.05807495,-0.02949524,-0.021133423,0.013069153,-0.051239014,-0.0071792603,-0.012084961,0.011245728,0.0043029785,-0.06945801,-0.021697998,-0.017227173,0.056396484,0.028030396,0.026016235,0.0022888184,-0.0007581711,0.059143066,0.015701294,-0.013252258,-0.029922485,0.019454956,-0.016052246,0.029006958,-0.0014362335,0.00819397,-0.016174316,0.040161133,0.08251953,0.0032405853,-0.019927979,-0.009635925,-0.040252686,-0.053497314,-0.046905518,0.022201538,0.00945282,-0.018493652,0.039611816,-0.033721924,-0.045135498,0.0050964355,0.027908325,0.011245728,0.0692749,-0.0022068024,0.02798462,0.022460938,0.025894165,-0.04525757,0.059631348,0.03338623,0.012710571,-0.010772705,-0.044128418,0.035003662,0.06097412,-0.028717041,0.009216309,-0.029327393,0.014480591,0.006717682,0.00497818,0.015083313,-0.014328003,-0.01020813,-0.028549194,-0.019134521,-0.00040841103,0.0009379387,-0.029067993,-0.03945923,-0.08929443,0.047973633,0.021209717,0.038848877,0.013633728,0.0034675598,-0.009590149,-0.011878967,-0.072631836,0.042175293,0.057861328,-0.0043411255,-0.0020389557,0.020187378,-0.003194809,-0.036193848,0.0018463135,-0.00081300735,-0.021896362,-0.035339355,0.009559631,-0.060272217,-0.004924774,0.020019531,0.03704834,0.066467285,-0.0038318634,-0.045654297,-0.009628296,-0.0017213821,-0.003686905,-0.02935791,-0.0017671585,-0.008338928,0.016342163,0.02293396,0.015411377,0.0029201508,0.007843018,0.021438599,0.0032596588,0.004837036,-0.015411377,-0.025665283,0.016723633,0.016983032,-0.061798096,0.0056610107,-0.015899658,0.08392334,-0.0435791,0.035247803,-0.031982422,0.03491211,0.038116455,-0.010910034,-0.029312134,0.006790161,0.030258179,0.025390625,0.038391113,0.0090789795,0.00010019541,-0.026550293,0.07006836,-0.016311646,0.009170532,-0.0038547516,0.017044067,0.042297363,-0.018508911,-0.039733887,-0.038269043,-0.022338867,-0.030899048,0.03414917,-0.022781372,0.043273926,-0.012275696,0.013977051,-0.018966675,0.0037136078,-0.030548096,0.007331848,-0.013244629,0.028717041,-0.019622803,-0.025634766,0.00919342,0.025634766,-0.03060913,0.018478394,0.0385437,0.03564453,-0.014045715,-0.02519226,-0.03274536,-0.008262634,0.004386902,0.014587402,0.019302368,0.024215698,0.051452637,-0.037963867,-0.01725769,0.019241333,0.009346008,0.02519226,0.010383606,-0.02458191,-0.052734375,-0.050048828,-0.023712158,-0.035125732,0.03302002,0.012008667,-0.007144928,0.056030273,0.008430481,-0.02168274,-0.053466797,0.01209259,-0.043823242,0.002357483,0.05444336,-0.021438599,-0.045684814,0.011512756,-0.007293701,0.0021018982,0.039611816,0.013046265,0.018859863,0.07434082,0.012237549,0.021209717,0.028198242,0.027786255,0.03656006,0.017684937,-0.020141602,-0.014678955,-0.011802673,0.02861023,-0.047607422,-0.031829834,-0.0736084,0.053222656,0.026550293,0.07873535,-0.0026454926,0.017929077,0.048950195,-0.0052719116,0.021759033,-0.027496338,-0.008918762,-0.030059814,-0.040802002,0.033111572,-0.007446289,-0.01348114,-0.013580322,0.04336548,-0.023269653,0.023971558,-0.026168823,0.045410156,-0.012542725,0.0068588257,0.016937256,-0.0059165955,0.05343628,0.06451416,-0.044952393,0.0064353943,0.016494751,-0.031799316,0.0067863464,0.04067993,-0.02482605,-0.008758545,-0.06774902,-0.023208618,-0.021759033,0.005455017,-0.040649414,0.012329102,-0.0040664673,0.017456055,0.017944336,-0.018569946,-0.02520752,-0.00052928925,-0.024551392,-0.03805542,0.0001733303,-0.034942627,-0.009048462,0.045135498,-0.015541077,-0.010902405,-0.005844116,-0.02708435,-0.009353638,0.009628296,0.032165527,-0.02507019,-0.03277588,0.041229248,0.0021362305,0.00076532364,0.025177002,0.045715332,0.04232788,0.013153076,0.04888916,0.025604248,-0.022613525,-0.06793213,0.016159058,-0.03060913,0.011680603,0.011962891,-0.029251099,0.0030021667,-0.013809204,-0.023330688,-0.025131226,0.014541626,-0.0079193115,0.01008606,0.016464233,-0.028762817,-0.03277588,-0.06341553,-0.03503418,0.0011138916,0.08282471,0.005218506,-0.012954712,-0.04940796,-0.00019228458,0.016494751,0.0061683655,0.040161133,-0.015808105,-0.006088257,-0.02708435,-0.021224976,-0.007385254,-0.018478394,0.028442383,-0.012420654,-0.013374329,0.031219482,0.009254456,0.020126343,0.011222839,-0.0068511963,0.029846191,-0.02015686,-0.009170532,-0.012451172,0.039733887,0.014289856,-0.0007529259,-0.037963867,0.050872803,-0.00038337708,0.039276123,-0.05203247,-0.009101868,-0.017501831,0.0036258698,0.025558472,-0.018554688,-0.007358551,0.008605957,-0.05758667,-0.07702637,0.01713562,-0.015464783,0.016937256,0.019805908,0.014030457,0.03387451,-0.004760742,0.002155304,0.005847931,-0.008621216,-0.0033988953,-0.024871826,-0.026153564,-0.038970947,-0.015960693,-0.02822876,0.027877808,-0.006095886,0.007575989,-0.005783081,-0.026565552,0.04449463,0.00076818466,-0.0076446533,0.02154541,0.011734009,0.023391724,0.046173096,0.016403198,-0.051574707,0.01689148,0.016036987,0.010253906,0.004234314,0.044036865,0.031677246,-0.013183594,-0.002155304,-0.0050964355,-0.014572144,-0.022506714,0.0010471344,0.0126571655,0.01979065,-0.002122879,-0.040374756,0.027648926,0.014328003,-0.035247803,-0.024490356,0.007843018,0.012245178,-0.03970337,0.018707275,0.01864624,0.064331055,-0.02758789,0.019332886,-0.0010108948,0.03186035,0.024108887,0.0076026917,-0.016937256,0.017318726,-0.015136719,0.008079529,-0.008773804,-0.012054443,0.014656067,0.0040245056,0.016616821,0.022384644,0.005279541,-0.030090332,-0.03353882,-0.0021018982,-0.033172607,-0.022857666,0.022857666,0.023910522,0.035247803,-0.01763916,0.028762817,0.014450073,-0.013839722,-0.024642944,-0.012382507,0.034606934,-0.017089844,-0.011016846,0.018417358,0.008728027,0.01499176,-0.06274414,-0.015777588,0.005367279,-0.0004477501,-0.018356323,-0.03579712,-0.03881836,-0.0048065186,0.046569824,0.0317688,0.021148682,0.021514893,0.01499176,0.008872986,0.017700195,-0.012321472,-0.017211914,-0.012878418,-0.04031372,-0.019515991,-0.0038452148,0.011947632,-0.024932861,0.013038635,0.006416321,-0.01727295,0.013442993,-0.0040016174,0.009353638,-0.005382538,-0.0055732727,0.036193848,-0.00374794,0.017181396,-0.016479492,-0.03378296,-0.00045585632,0.0075302124,0.024505615,-0.039611816,0.019439697,-0.012054443,-0.008605957,-0.0030956268,0.027435303,0.0115737915,0.030929565,0.013710022,0.039276123,-0.03982544,0.052520752,-0.02708435,0.008575439,0.007709503,-0.02519226,-0.011245728,-0.015342712,-0.0069885254,0.044128418,-0.018829346,-0.0077934265,-0.021911621,-0.035369873,-0.016616821,-0.05709839,0.029769897,0.05407715,0.048980713,-0.020141602,-0.0023708344,0.0021514893,0.004470825,-0.0024642944,-0.009208679,-0.005115509,0.02267456,0.017456055,0.007419586,-0.032714844,-0.026184082,0.0019683838,0.02633667,-0.0519104,-0.048187256,-0.012191772,0.001168251,-0.013793945,-0.00039815903,-0.013763428,-0.054870605,-0.0060920715,-0.038208008,0.017913818,0.00016474724,0.016586304,0.011543274,-0.018447876,-0.007965088,-0.0001026392,-0.015823364,0.030517578,-0.015098572,-0.021820068,-0.04147339,0.00856781,0.028518677,0.018371582,-0.010604858,-0.01939392,-0.00032567978,-0.03729248,-0.055633545,-0.00084638596,-0.017684937,-0.016448975,-0.01739502,0.013687134,-0.05267334,-0.00018489361,-0.036224365,0.00067329407,0.03100586,0.016494751,0.0028648376,-0.0033454895,0.005306244,-0.010131836,-0.025665283,-0.0357666,0.024856567,0.011749268,0.012199402,0.03552246,0.040893555,-0.001083374,-0.012138367,0.008880615,0.004333496,0.017929077,-0.0158844,0.011657715,-0.031677246,0.018844604,-0.014183044,-0.0010643005,-0.023635864,-0.0038394928,0.066223145,0.013450623,0.00819397,-0.007873535,-0.012748718,0.01928711,0.020202637,-0.03817749,-0.0020332336,-0.022354126,0.024475098,-0.012184143,0.013092041,-0.0064315796,0.0043525696,-0.023361206,-0.047302246,-0.0074539185,-0.013885498,-0.012649536,-0.07287598,-0.02355957,-0.08306885,-0.0017623901,-0.019897461,-0.034179688,-0.012275696,0.009353638,-0.008270264,-0.08343506,0.00018453598,0.05618286,-0.013244629,0.03149414,-0.0010318756,0.022109985,0.03036499,-0.038085938,0.001578331,0.022750854,-0.024337769,-0.02708435,-0.009147644,0.023391724,-0.0029830933,-0.012321472,0.0033855438,0.0037879944,0.016677856,-0.014183044,0.021972656,-0.006095886,0.025665283,-0.0060043335,0.019866943,-0.020324707,-0.014450073,0.039489746,-0.05581665,0.026229858,0.0048599243,-0.005207062,-0.0007200241,0.03137207,0.03265381,-0.03277588,-0.015007019,0.03842163,0.011528015,0.03579712,-0.011253357,0.044433594,-0.0059165955,-0.013282776,0.0054626465,-0.014015198,-0.0066337585,-0.03564453,-0.033599854,0.03161621,-0.0012283325,0.01637268,-0.015151978,-0.011238098,0.023666382,-0.00037908554,0.0073051453,-0.02607727,-0.01737976,-0.022720337,0.006427765,0.006893158,0.0049819946,0.014015198,0.026473999,0.013893127,0.028030396,0.0048065186,-0.011276245,0.013938904,0.038635254,-0.0060768127,0.0084991455,0.028167725,0.010612488,0.009811401,0.018981934,0.01612854,-0.035980225,-0.008132935,-0.029312134,-0.0149383545,-0.0052871704,-0.020080566,-0.010406494,0.0026607513,0.003118515,-0.01133728,-0.030654907,-0.0029468536,-0.03213501,-0.022659302,-0.010055542,-0.0038108826,0.019424438,0.013198853,0.00333786,0.0022239685,-0.014640808,0.048614502,-0.00017154217,-0.007270813,0.030303955,0.024017334,0.014656067,-0.013473511,-0.0040664673,-0.0022468567,-0.004299164,0.0095825195,-0.031799316,0.008705139,0.037994385,-0.008476257,-0.000028669834,0.0016040802,0.03189087,-0.002696991,0.008598328,0.005844116,0.022109985,-0.021316528,0.027954102,-0.05117798,0.015556335,0.018539429,-0.0019817352,0.0042037964,-0.015357971,-0.019805908,0.026794434,-0.0049476624,-0.0016508102,0.047088623,-0.0076828003,0.020187378,-0.022018433,-0.03488159,-0.0053710938,-0.022644043,-0.011550903,0.0029945374,-0.008338928,0.010826111,0.0015554428,-0.03262329,0.03793335,-0.034088135,0.013671875,-0.0019874573,0.014907837,0.01424408,-0.016143799,-0.0015935898,-0.0052452087,-0.0140686035,0.007095337,-0.001745224,0.0513916,0.0368042,0.033050537,0.028900146,0.015045166,0.008308411,-0.045318604,-0.03427124,-0.008796692,-0.0119018555,0.019866943,-0.011657715,0.045898438,0.032928467,0.016937256,0.037384033,0.030517578,0.055633545,0.0018835068,0.0051841736,-0.015960693,0.010231018,-0.0093688965,0.0079422,-0.0052719116,0.03152466,-0.03387451,0.028030396,0.010093689,0.015029907,-0.020477295,0.026367188,0.062561035,0.015541077,0.01322937,0.038604736,-0.015960693,-0.016708374,-0.008132935,-0.023498535,0.044921875,0.015357971,0.060028076,0.036468506,0.0057373047,-0.0035076141,0.0155181885,-0.019454956,-0.01210022,0.040283203,0.017303467,-0.017868042,-0.011222839,0.001584053,0.008590698,-0.04144287,-0.003414154,-0.0032653809,0.016845703,0.0035037994,-0.0068626404,-0.010063171,-0.0067825317,-0.010185242,0.008384705,0.005466461,-0.011688232,0.02406311,0.017684937,-0.0017127991,0.023712158,-0.015853882,0.02696228,-0.02897644,-0.029220581,0.017593384,0.011428833,-0.0055160522,0.00198555,0.03768921,-0.005592346,0.035980225,0.03970337,-0.017715454,-0.007091522,0.009185791,0.014518738,-0.004436493,0.0473938,0.02748108,0.016815186,0.028015137,0.026489258,0.02619934,-0.030517578,0.022827148,-0.0028362274,0.010543823,-0.012245178,-0.020507812,0.015327454,-0.00995636,0.004131317,0.006389618,-0.033721924,0.024795532,0.010536194,-0.014190674,-0.002565384,-0.01109314,0.020889282,-0.014785767,-0.004966736,-0.0020484924,0.0020885468,0.035827637,0.0158844,0.03164673,-0.021087646,0.030258179,-0.006565094,-0.0078048706,0.003993988,0.020355225,-0.029067993,0.0051231384,-0.013572693,-0.0014133453,-0.043792725,0.005634308,0.00020873547,-0.010917664,0.008544922,0.010574341,-0.00554657,-0.00881958,0.028961182,0.0051841736,-0.005809784,-0.0063285828,-0.024658203,0.038391113,0.027236938,-0.004096985,-0.0025997162,-0.028198242,0.008094788,0.0033397675,-0.005683899,0.005329132,-0.0008921623,-0.020080566,-0.019424438,0.022109985,0.02168274,0.0357666,0.044189453,-0.015464783,-0.012138367,-0.013183594,0.040008545,0.012649536,0.003107071,-0.00042676926,0.012214661,-0.014694214,0.042999268,0.020019531,0.0151901245,0.03262329,-0.0077667236,-0.008781433,0.006717682,-0.023925781,0.02381897,-0.014961243,-0.0010385513,-0.0029773712,0.0184021,-0.007583618,-0.035827637,0.013870239,-0.011276245,-0.027572632,-0.015586853,0.025100708,-0.0055656433,0.021911621,0.022262573,0.01637268,-0.021270752,0.06604004,-0.023071289,0.050872803,0.010070801,-0.012313843,0.05230713,0.013595581,0.044067383,0.010726929,0.0067634583,-0.023239136,0.010475159,0.041107178,0.033966064,0.01991272,-0.0031642914,-0.029083252,0.02848816,-0.0077400208,0.026138306,-0.0009121895,-0.0074424744,0.019104004,-0.0008111,-0.0018892288,-0.0034885406,-0.0056152344,0.009063721,0.04498291,0.0031490326,-0.007522583,-0.013031006,-0.019744873,0.02229309,-0.0027751923,0.0015087128,-0.0050849915,-0.016677856,0.015304565,-0.031982422,-0.025894165,0.009010315,0.021438599,-0.052825928,-0.018692017,0.010116577,0.018920898,-0.028366089,0.03353882,0.013008118,-0.0074539185,0.009132385,0.03793335,-0.011764526,0.018508911,-0.0028762817,0.018341064,0.035491943,0.010818481,-0.026473999,-0.0040283203,0.011634827,-0.02168274,0.02178955,0.024536133,-0.0051193237,-0.009407043,0.0016155243,-0.006614685,-0.0032520294,0.0072517395,0.00289917,0.0064849854,-0.010658264,-0.015594482,0.0027923584,0.009307861,0.007881165,0.002866745,-0.004524231,-0.009590149,0.0053901672,0.046142578,0.020355225,-0.0413208,0.012779236,0.0006055832,0.013298035,-0.017410278,-0.0029335022,-0.011108398,-0.044555664,0.022766113,0.013954163,0.0017557144,0.0138168335,-0.024017334,0.00920105,0.026168823,0.011665344,0.021026611,0.013290405,-0.006450653,-0.0032463074,-0.010612488,-0.006866455,-0.014129639,-0.012496948,-0.0018987656,0.024795532,0.006416321,-0.0284729,0.029815674,0.010398865,0.0079956055,-0.01423645,-0.011238098,0.009780884,-0.011802673,-0.004108429,0.0078125,0.009811401,-0.014328003,-0.013366699,-0.016738892,0.040374756,0.058135986,-0.013534546,-0.010002136,0.019699097,0.023651123,0.026687622,0.031677246,0.001821518,0.03479004,0.033111572,-0.028259277,-0.024963379,0.013305664,-0.015045166,-0.012870789,0.023025513,-0.001458168,-0.022613525,0.017471313,0.009712219,-0.0011949539,-0.04458618,-0.016586304,-0.009132385,-0.024215698,0.0082473755,0.011238098,0.011047363,-0.017913818,-0.020263672,0.00642395,-0.020828247,-0.041931152,-0.014976501,-0.010910034,-0.014183044,-0.05807495,-0.00018370152,-0.016082764,0.0066337585,-0.0256958,0.0045318604,-0.0071029663,0.027786255,-0.011367798,-0.0057792664,0.003194809,0.027816772,0.024749756,0.0024356842,0.015274048,-0.022964478,-0.029434204,-0.009346008,0.0053710938,-0.025466919,0.00579834,-0.014274597,0.044281006,0.018478394,-0.006591797,-0.0054855347,-0.009178162,0.0051841736,-0.012809753,-0.017791748,-0.017684937,0.036346436,0.02470398,0.0013122559,-0.011077881,0.03390503,-0.027282715,0.0063171387,0.022735596,0.03540039,0.017990112,0.020050049,-0.0039749146,0.0019721985,-0.020080566,0.00121212,-0.011054993,0.0008611679,-0.0014324188,-0.0038394928,-0.001200676,0.014625549,0.012542725,-0.0068244934,-0.00919342,0.034423828,0.01574707,-0.0043525696,0.018066406,0.028030396,0.002506256,-0.026809692,-0.012565613,0.032409668,0.04916382,-0.003042221,0.013244629,-0.0055122375,0.0056495667,-0.007865906,0.010070801,0.015136719,-0.021499634,-0.05255127,-0.021835327,-0.029251099,0.037719727,-0.0178833,0.001663208,-0.005241394,0.019699097,-0.011512756,-0.03604126,-0.016983032,0.02041626,0.00048065186,-0.011993408,-0.0138549805,0.011581421,0.004878998,-0.03250122,0.0060653687,-0.048797607,-0.027526855,-0.016464233,-0.010360718,0.018035889,0.010658264,-0.00969696,-0.006778717,0.00843811,0.005832672,0.01071167,0.022903442,-0.012382507,0.004627228,0.020965576,0.029891968,-0.025848389,0.024398804,-0.008506775,0.0018081665,0.010307312,-0.01071167,0.0066947937,-0.02178955,0.034301758,-0.01285553,-0.0154800415,0.025344849,-0.0018568039,0.005718231,-0.02444458,-0.0019550323,-0.010292053,0.0026950836,0.045776367,-0.023513794,-0.019088745,0.009811401,-0.010299683,-0.023666382,0.0012559891,0.022537231,0.036102295,-0.00061035156,0.045684814,-0.018951416,0.0051231384,0.00655365,0.008430481,-0.025039673,0.0129852295,0.026748657,0.0044441223,-0.0010786057,-0.0021419525,-0.00932312,-0.03149414,-0.010276794,0.019973755,-0.0013427734,-0.016708374,0.02897644,0.014595032,0.047454834,-0.0025920868,0.0007762909,0.029067993,-0.0017585754,0.030578613,0.014129639,0.035888672,0.009780884,-0.026733398,-0.0005197525,-0.008811951,-0.018844604,0.016052246,-0.009597778,0.003358841,-0.030838013,0.0014648438,-0.0059165955,0.019210815,-0.014015198,0.017944336,-0.02267456,-0.0030651093,-0.042907715,0.000011026859,-0.02293396,0.014595032,0.04309082,0.009277344,0.026428223,-0.0035762787,-0.013290405,0.022216797,0.04776001,-0.009162903,-0.035949707,-0.010910034,-0.0037670135,-0.017868042,0.018661499,0.007980347,-0.02545166,-0.029708862,-0.0036334991,-0.008026123,0.0037956238,-0.014129639,0.020950317,0.0037784576,0.013191223,0.0034885406,0.010292053,-0.017196655,0.006290436,0.008430481,0.0032348633,0.023330688,0.029525757,-0.03048706,0.029312134,0.012168884,-0.045959473,0.043029785,0.003440857,0.038909912,-0.018173218,0.012397766,-0.0357666,-0.027770996,-0.005531311,-0.0001885891],"createdAt":"2026-04-18T18:32:17.153Z","updatedAt":"2026-04-23T23:01:55.019Z","lastSeenAt":"2026-04-23T23:01:55.019Z","tsv":"'/api':191 '/api/v1/carts/99':111,231 '/call':13,33 '/docs':190 '/pricing':192 '/readme':194 '0.02':12,32,127,163 '000':123 '20':122 '6':130 'Base network API' 'USDC API payment' 'accept':178 'access':117 'actual':225 'advertis':137 'ai':16,36 'ai-inference' 'ai/ml':58 'also':136 'analysi':141 'analyt':57 'api':5,25,47,87,116 'attach':98 'avail':220,235 'base':8,28,82 'behavior':226 'beyond':182 'call':133 'caller':96 'captur':171 'challeng':168 'classif':144 'classification' 'collect':52 'commit':95 'confirm':172 'connect':200 'content':206 'convers':156 'crawl':223 'crypto payment API' 'crypto-data' 'data':15,35,56,61 'data-analytics' 'decim':131 'document':181,215 'embed':145 'embeddings' 'enabl':46 'endpoint':20,40,54,66,109,138,174 'estim':153 'exampl':219 'exchang':148 'extrem':187 'feed':147 'financ':17,37 'finance-data' 'finance/web3':60 'format':229 'gas':152 'generat':158 'geocod':154 'geocoding' 'given':129 'header':103 'infer':59 'infrastructur':63 'key':88 'land':184 'limit':91 'list':113 'live':176 'low fee API' 'lowpaymentfee.com':41 'materi':236 'micropayment API' 'minimum':94 'network':9,29,83 'no-api-key' 'offer':50 'openapi':210 'page':185,195 'pay':2,22,69 'pay per request API' 'pay-per-request':1,21,68 'payment':77,102 'per':3,23,70,132 'platform':6,26,48,135 'point':165 'post':179 'premium':115 'price':146,164 'prompt':202 'protocol':75 'quot':151 'rate':90,149 'request':4,24,71,106,180 'request/response':213 'requir':119 'respons':228 'return':197 'schema':214 'sentiment':140 'sentiment-analysis' 'settl':76 'simpli':97 'span':55 'spec':211 'specif':108 'substant':205 'success':170 'summar':143 'text':142 'text-summarization' 'thin':188 'token':150 'unclear':233 'unit':124 'usag':218 'usdc':79,126,128 'usdc-base-network' 'use':72 'util':19,39,64 'utility-services' 'valid':155 'via':10,30 'wallet':201 'x':101 'x-payment':100 'x402':11,31,45,74,167 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"6703a1b0-6669-4c08-9685-fca3e383c83b","listingId":"2292ec43-30d7-469b-b443-f208ee2e820e","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/carts/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:17.153Z"}],"sources":[{"listingId":"2292ec43-30d7-469b-b443-f208ee2e820e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:17.153Z","lastSeenAt":"2026-04-23T23:01:55.019Z"}],"details":{"listingId":"2292ec43-30d7-469b-b443-f208ee2e820e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/99 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 (0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/carts/99"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/99"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Exporting data or generating analytics reports via pay-as-you-go endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","Use cases requiring USDC micropayments on Base L2","Prototyping or low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, request/response schemas, or error handling guides","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.132Z"},"updatedAt":"2026-04-23T23:01:55.019Z"}}