{"id":"72d4da78-64a5-4f9e-a27d-9571ce6d0e13","shortId":"NEZvYs","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 settled in USDC on the Base network. The specific endpoint `/api/v1/keys/61` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four categories of APIs: 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 listed endpoints share the same $0.02/request pricing.\n\nThe endpoint at `/api/v1/keys/61` returned a valid 402 challenge confirming it is live. However, the specific functionality behind this particular path is unclear — the description simply says \"Premium API Access\" without detailing what data or service it returns. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","micropayment API","x402 API","pay per call API","USDC API","Base network API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/keys/61 ('Premium API Access') is not explained anywhere","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'","No request or response examples are available to verify what data this endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/61","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/keys/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing endpoint names. The specific functionality of /api/v1/keys/61 is undocumented. Most crawled pages returned only 'Connect wallet' with no useful content.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-21T22:17:10.036Z","embedding":[-0.008468628,-0.027755737,0.05166626,0.0053482056,0.024658203,-0.031585693,-0.023330688,0.045013428,0.07171631,-0.06652832,0.024978638,-0.053131104,-0.029373169,-0.0335083,-0.0231781,0.009162903,-0.006412506,0.005504608,-0.04675293,0.036102295,0.024536133,-0.029052734,-0.016693115,0.027755737,0.0021476746,-0.013061523,-0.008178711,-0.03677368,-0.017730713,-0.033325195,0.056427002,-0.025436401,-0.013313293,0.0093307495,-0.018737793,-0.017959595,0.006500244,0.027145386,0.02897644,-0.008590698,-0.01209259,-0.06945801,0.014373779,-0.0058898926,-0.045959473,-0.015296936,0.00774765,-0.017822266,0.003616333,-0.0112838745,-0.044555664,-0.0032024384,-0.0032138824,0.007381439,-0.0030078888,0.015808105,-0.0045166016,-0.019515991,0.011169434,0.0037498474,0.010063171,-0.04660034,-0.02015686,0.0045776367,0.003227234,0.049102783,-0.010429382,0.046905518,0.016174316,0.051239014,0.020721436,0.058776855,0.019744873,0.009925842,-0.013587952,-0.00015330315,-0.00995636,0.057495117,-0.004524231,-0.02142334,-0.015686035,-0.0069847107,-0.03665161,-0.008956909,-0.010284424,-0.04147339,-0.027618408,0.007381439,-0.022964478,0.026397705,-0.06774902,-0.024475098,-0.0013694763,0.010093689,0.010925293,-0.00819397,-0.010177612,0.024368286,-0.016464233,0.0259552,-0.006011963,-0.03866577,0.016036987,0.009796143,0.038848877,0.057739258,0.014541626,0.016357422,0.00945282,-0.023117065,-0.058166504,-0.0058403015,-0.018997192,-0.025848389,0.011421204,0.004085541,-0.011924744,0.003068924,-0.027572632,-0.002571106,-0.05429077,0.04949951,0.02293396,0.0016231537,0.002817154,-0.044067383,-0.0044517517,0.014305115,-0.034820557,-0.027618408,-0.004573822,0.021087646,0.019927979,-0.0016822815,-0.04425049,0.011787415,-0.013290405,-0.03375244,-0.043060303,-0.031707764,0.020889282,-0.025390625,0.037078857,0.040222168,-0.103515625,-0.014450073,-0.040374756,0.00920105,-0.03012085,-0.0017967224,-0.005619049,0.033325195,-0.0046539307,-0.01876831,-0.013847351,-0.0181427,0.0030593872,0.029708862,-0.019226074,0.042663574,-0.014472961,0.03643799,0.018356323,0.00856781,0.022750854,0.026519775,0.016464233,-0.08062744,-0.08117676,-0.021621704,-0.0037555695,-0.027145386,-0.026107788,0.01828003,-0.01828003,-0.056274414,-0.008201599,-0.0013561249,-0.004688263,-0.05545044,-0.01146698,-0.013572693,0.015625,-0.008987427,-0.04473877,-0.0074005127,-0.01689148,0.06323242,0.01084137,0.02583313,0.02960205,-0.015014648,0.062194824,0.021331787,-0.018753052,-0.025787354,0.010169983,-0.026535034,0.025512695,-0.0032253265,0.002231598,-0.04550171,0.04058838,0.055908203,0.028640747,-0.016952515,-0.021148682,-0.05206299,-0.03665161,-0.035003662,0.02520752,0.014266968,0.007881165,0.0423584,-0.036499023,-0.029556274,-0.0003130436,0.0039634705,0.023208618,0.06414795,-0.009124756,-0.010879517,0.023101807,0.02758789,-0.039520264,0.03881836,0.027389526,0.013244629,-0.018493652,-0.009109497,0.026519775,0.03845215,-0.012046814,0.004219055,-0.022567749,0.033325195,-0.004005432,0.0016260147,0.01663208,-0.0124053955,-0.018371582,-0.035247803,-0.03302002,0.027297974,0.0019512177,-0.0140686035,-0.023727417,-0.079833984,0.04168701,0.020095825,0.045562744,-0.016540527,0.017990112,-0.0234375,-0.0025501251,-0.06555176,0.052612305,0.07434082,0.0033416748,-0.018630981,0.01914978,-0.012016296,-0.03353882,0.0047416687,-0.012214661,-0.046081543,-0.011558533,0.023117065,-0.04751587,-0.015235901,0.018127441,0.027069092,0.056854248,-0.021392822,-0.033843994,-0.02003479,-0.0073280334,0.0005311966,-0.03149414,0.0039405823,-0.0032749176,0.010421753,0.023986816,-0.011764526,0.0129852295,0.0019397736,0.015670776,-0.0065994263,-0.0061531067,-0.027572632,-0.027572632,0.016845703,0.0053863525,-0.06088257,0.0052986145,-0.0046157837,0.06726074,-0.027618408,0.039978027,-0.009338379,0.020690918,0.032226562,-0.0064315796,-0.052581787,0.006088257,0.03237915,0.025924683,0.050079346,0.008895874,-0.023330688,-0.006702423,0.077941895,-0.011810303,-0.0151901245,0.000808239,0.0004878044,0.026565552,-0.017669678,-0.053344727,-0.02999878,-0.0079956055,-0.024505615,0.018554688,-0.01902771,0.01940918,-0.006313324,0.017669678,-0.012672424,0.012809753,-0.026657104,0.028274536,-0.032348633,0.014305115,-0.016967773,-0.04043579,0.015808105,0.019332886,-0.0017213821,-0.0058937073,0.034973145,0.021697998,-0.016204834,-0.03289795,-0.018920898,-0.009391785,-0.0060424805,0.025466919,0.010299683,0.015419006,0.048065186,-0.019638062,0.004501343,0.031021118,0.02709961,0.033935547,-0.0102005005,0.004600525,-0.06756592,-0.050048828,-0.016067505,-0.026626587,0.023284912,0.0087890625,0.0017976761,0.05493164,0.0055770874,-0.042907715,-0.04812622,0.02520752,-0.03729248,-0.009048462,0.031555176,-0.008300781,-0.03857422,-0.0020618439,-0.0005464554,0.005115509,0.03970337,0.012870789,0.020721436,0.07092285,0.040618896,-0.0045700073,0.020126343,0.007881165,0.023666382,0.020111084,-0.022033691,-0.033355713,0.008460999,0.03704834,-0.016540527,-0.020721436,-0.08758545,0.077941895,0.041229248,0.062072754,0.014923096,0.019104004,0.04550171,-0.0141067505,0.0118255615,-0.022369385,0.00082731247,-0.008583069,-0.04248047,0.0463562,-0.02041626,0.0042304993,-0.03302002,0.05029297,-0.0031871796,0.022644043,-0.04458618,0.04525757,-0.006275177,0.0024433136,0.012336731,0.00040721893,0.05545044,0.067993164,-0.056274414,0.018600464,0.028060913,-0.025970459,0.017074585,0.058776855,-0.005760193,-0.015220642,-0.06890869,-0.021499634,-0.0017576218,-0.0026836395,-0.05618286,-0.001660347,0.012901306,0.008377075,0.024414062,-0.025115967,-0.01928711,-0.011932373,-0.031066895,-0.06323242,0.00881958,-0.04574585,0.0019702911,0.03274536,-0.038085938,-0.019088745,0.01146698,-0.012420654,-0.021011353,0.004627228,0.028121948,-0.00012814999,-0.038116455,0.03668213,0.011474609,-0.006439209,0.008972168,0.019714355,0.01776123,0.027694702,0.04977417,0.013267517,-0.01272583,-0.058532715,0.02722168,-0.052612305,0.0036182404,0.018310547,-0.027755737,0.007080078,-0.0055351257,-0.041137695,-0.023849487,0.019348145,-0.035888672,0.0007958412,0.0158844,-0.03515625,-0.020217896,-0.058013916,-0.009475708,-0.0019302368,0.062286377,0.02330017,-0.000289917,-0.041992188,0.005207062,0.007572174,0.004432678,0.045135498,-0.014450073,-0.0127334595,-0.015037537,-0.01576233,-0.015129089,-0.02923584,0.03201294,-0.012557983,-0.018112183,0.028457642,0.015403748,0.00674057,0.0077590942,0.011375427,0.022720337,-0.028427124,-0.01600647,-0.009651184,0.042175293,0.007572174,-0.009208679,-0.040863037,0.04095459,0.018814087,0.037322998,-0.029663086,-0.009887695,-0.010131836,0.008926392,0.0154418945,-0.013175964,-0.010978699,-0.014595032,-0.05822754,-0.07312012,0.036071777,-0.023986816,0.028198242,0.020553589,0.016448975,0.021987915,-0.016662598,0.012001038,0.026382446,-0.023986816,-0.0054016113,-0.016952515,-0.03552246,-0.01939392,0.004081726,-0.015975952,0.021606445,-0.01727295,0.0064353943,-0.008071899,-0.024154663,0.02545166,0.026275635,-0.010169983,0.015151978,0.007144928,0.025238037,0.046051025,0.0093307495,-0.05392456,0.023361206,0.006412506,0.010848999,0.0036354065,0.048675537,0.031433105,-0.012031555,-0.012878418,0.0044288635,-0.022491455,-0.016418457,0.0039367676,0.0046691895,0.01687622,-0.015670776,-0.055877686,0.020706177,0.016082764,-0.037994385,-0.015838623,0.02999878,0.015960693,-0.03225708,0.014854431,0.015296936,0.05895996,-0.030227661,0.0050086975,0.012184143,0.034698486,0.024658203,0.009559631,-0.0065612793,0.02168274,-0.017623901,0.007881165,-0.01373291,0.0016422272,0.024780273,-0.0014896393,0.017852783,0.020935059,0.014930725,-0.015464783,-0.026031494,0.0023841858,-0.02331543,-0.013755798,0.010292053,0.024307251,0.022842407,-0.023620605,0.015701294,0.0070877075,-0.013572693,-0.009628296,-0.007160187,0.030731201,-0.012840271,-0.009155273,0.016098022,-0.0036945343,0.024520874,-0.041809082,-0.008659363,0.008331299,0.017211914,-0.033721924,-0.054138184,-0.0390625,0.0073280334,0.039489746,0.008575439,0.019744873,0.033050537,0.001953125,0.008460999,0.027832031,-0.0016422272,-0.023452759,-0.0079422,-0.03262329,-0.024307251,-0.0029582977,-0.0030384064,-0.038085938,0.010375977,-0.005142212,-0.032714844,0.01008606,-0.010528564,-0.0030841827,-0.007472992,0.008880615,0.035705566,0.015930176,0.015419006,-0.018432617,-0.026306152,0.0013370514,0.0056762695,0.021942139,-0.044036865,0.017791748,-0.009971619,-0.021270752,-0.007545471,0.00598526,0.022659302,0.029449463,0.009544373,0.025909424,-0.061676025,0.048431396,-0.033599854,0.020965576,0.002105713,-0.03353882,-0.00014102459,-0.028427124,-0.020721436,0.04446411,-0.017486572,-0.0124435425,-0.039611816,-0.027252197,-0.009979248,-0.0569458,0.02053833,0.053771973,0.04067993,-0.024963379,-0.0049934387,0.0062675476,0.0029659271,-0.011695862,-0.0044822693,-0.0015354156,0.026931763,0.031677246,-0.00983429,-0.022842407,-0.020828247,-0.017227173,-0.016815186,-0.042236328,-0.062561035,-0.000032365322,0.021438599,-0.00869751,-0.00021517277,-0.026489258,-0.036468506,-0.0012693405,-0.04260254,0.0090408325,-0.0021266937,0.010261536,-0.00919342,-0.01826477,0.01134491,0.026031494,-0.029052734,0.042022705,0.013130188,-0.0058021545,-0.0357666,0.016677856,0.031341553,0.024932861,0.00605011,-0.015960693,-0.009933472,-0.020095825,-0.048797607,0.0015659332,0.008560181,-0.0151901245,-0.006893158,0.00006097555,-0.052612305,-0.009094238,-0.016677856,-0.0071525574,0.024765015,0.028274536,0.0009355545,0.0015993118,0.010437012,-0.00029301643,-0.018753052,-0.03302002,0.02130127,0.010612488,0.002073288,0.024124146,0.045898438,0.019638062,-0.023605347,0.0158844,0.010894775,0.023406982,-0.016723633,0.012451172,-0.017974854,0.0093688965,0.00075626373,-0.018218994,-0.02772522,-0.016357422,0.08496094,0.0115356445,-0.013832092,-0.006164551,-0.010169983,0.0046539307,0.01713562,-0.05154419,0.009460449,-0.033935547,0.012763977,-0.01651001,0.02027893,0.0072631836,0.009773254,-0.009681702,-0.045074463,-0.0051460266,0.0129470825,-0.0058021545,-0.07519531,-0.015602112,-0.04852295,-0.0068855286,-0.011703491,-0.023483276,0.0025424957,-0.011528015,-0.0079422,-0.08630371,0.020507812,0.044036865,0.01763916,0.027175903,-0.010925293,0.008285522,0.013221741,-0.030654907,-0.011047363,0.03189087,-0.024536133,-0.024765015,-0.015556335,0.026885986,-0.0037765503,-0.01399231,0.002117157,-0.007335663,0.02545166,-0.005619049,0.009140015,-0.013084412,0.020751953,-0.03387451,0.012062073,-0.0057754517,-0.012802124,0.030334473,-0.05441284,0.023330688,0.0128479,0.002117157,0.0039711,0.026657104,0.03363037,-0.046142578,-0.021377563,0.020111084,-0.008522034,0.024932861,-0.026138306,0.052612305,0.018432617,-0.013076782,0.018127441,-0.0024814606,-0.010864258,-0.034179688,-0.021835327,0.02029419,0.011993408,0.016830444,-0.01914978,0.002456665,0.043029785,-0.0058403015,0.01902771,-0.012367249,-0.026779175,-0.012428284,0.0019483566,0.00097227097,0.009849548,0.012031555,0.026641846,0.017578125,0.038757324,0.011756897,-0.010787964,0.017486572,0.016448975,-0.01586914,0.0008111,0.029312134,0.016403198,0.004688263,0.019210815,0.008155823,-0.04345703,0.0020332336,-0.026489258,-0.026809692,0.0060806274,-0.010787964,-0.026382446,-0.014839172,0.013587952,0.00020492077,-0.03463745,0.005519867,-0.031097412,-0.027359009,0.0073547363,-0.011734009,0.022338867,0.011398315,0.010803223,0.006134033,0.010749817,0.058410645,0.004585266,-0.0023651123,0.028564453,0.02583313,0.006996155,-0.03894043,0.0022659302,-0.016159058,0.014228821,0.0068588257,-0.036224365,0.02255249,0.0440979,-0.025970459,0.008850098,0.00057697296,0.016571045,-0.031799316,-0.0042381287,-0.0049324036,0.012878418,-0.018997192,0.037719727,-0.043395996,0.02041626,0.015914917,-0.002073288,-0.011779785,-0.026779175,-0.030700684,0.00969696,-0.0073928833,-0.013572693,0.05404663,-0.006164551,0.018981934,-0.008651733,-0.014045715,0.009178162,-0.042633057,-0.014961243,0.028762817,-0.00983429,0.0019207001,0.0088272095,-0.03173828,0.039154053,-0.037902832,0.011016846,0.009651184,-0.0032081604,-0.0037555695,-0.0073165894,-0.01361084,0.0037879944,-0.0115356445,-0.002822876,-0.00089645386,0.052734375,0.027175903,0.0340271,0.0413208,-0.00040960312,-0.0039520264,-0.03945923,-0.018569946,0.009101868,-0.021270752,0.030700684,-0.01373291,0.040863037,0.03579712,-0.0046043396,0.02633667,0.041625977,0.026855469,-0.00029993057,0.010345459,-0.014907837,0.015991211,0.0021190643,0.034240723,-0.0030784607,0.04159546,-0.027069092,0.021697998,0.017303467,0.01852417,-0.03262329,0.03643799,0.06506348,0.024841309,-0.010154724,0.029663086,-0.0028324127,0.0043563843,-0.015731812,-0.027801514,0.052642822,0.009742737,0.043060303,0.047332764,0.0013418198,-0.00024020672,0.012245178,-0.02079773,-0.02784729,0.07080078,0.019424438,-0.019622803,-0.0033874512,-0.009223938,0.0065689087,-0.04574585,-0.023391724,0.0184021,-0.017852783,0.004825592,-0.025344849,0.003967285,-0.011741638,0.000808239,0.014373779,0.016403198,-0.014511108,0.0368042,0.01966858,0.011207581,0.030441284,0.0047302246,0.024642944,-0.031036377,-0.03564453,0.0079193115,0.01637268,-0.002746582,-0.008972168,0.020950317,0.01537323,0.048797607,0.039916992,-0.009460449,0.013702393,0.0357666,0.015960693,0.0000308156,0.055664062,0.031982422,0.014854431,0.023864746,0.035705566,0.0340271,-0.034973145,0.0075187683,0.0068588257,0.0007915497,-0.0178833,-0.022476196,0.0037078857,-0.007926941,0.015930176,-0.008842468,-0.016479492,0.030548096,0.02255249,-0.0067749023,0.00017678738,-0.00072336197,0.012870789,-0.006164551,-0.0038471222,0.012786865,-0.021621704,0.023147583,0.011680603,0.023513794,-0.022125244,0.021575928,0.0031318665,-0.017288208,-0.009925842,0.03540039,-0.03656006,0.012229919,0.0069389343,-0.010009766,-0.04736328,0.011558533,0.019760132,0.007499695,0.03189087,0.019683838,-0.008842468,-0.005580902,0.005355835,0.008163452,0.002922058,-0.0077552795,-0.026992798,0.025360107,0.037078857,-0.000047802925,0.02293396,-0.015296936,-0.014801025,-0.00048589706,-0.015037537,-0.0018014908,-0.014541626,-0.019302368,-0.025985718,0.0063667297,0.037017822,0.021438599,0.052886963,-0.013320923,-0.010665894,0.012634277,0.028060913,0.0033569336,0.012588501,-0.0063476562,0.013954163,-0.00541687,0.04244995,0.0435791,0.014320374,0.04107666,-0.02746582,-0.008308411,0.0055160522,-0.008560181,0.027404785,-0.011199951,0.011688232,0.0006747246,0.030517578,-0.020690918,-0.0385437,0.0058555603,-0.02381897,-0.013305664,-0.020843506,0.0016384125,0.0046424866,0.028945923,0.05041504,0.02973938,-0.031585693,0.066345215,-0.007572174,0.06311035,-0.006778717,-0.024353027,0.029785156,0.020874023,0.019302368,0.01210022,0.017715454,-0.03201294,0.00920105,0.046905518,0.035003662,0.0060768127,0.010017395,-0.012611389,0.025054932,0.0034294128,0.031829834,-0.0055999756,0.0029678345,0.019577026,-0.00055933,-0.017837524,0.001206398,0.00051546097,0.0024547577,0.039093018,-0.03479004,-0.01789856,-0.028656006,-0.01838684,0.025100708,-0.0056495667,0.0082473755,-0.01675415,-0.025024414,0.015899658,-0.031204224,-0.022491455,-0.0016212463,0.022872925,-0.043304443,-0.016967773,-0.0006122589,0.018493652,-0.020370483,0.019699097,0.033294678,-0.016021729,0.0034294128,0.0501709,-0.01727295,0.025939941,-0.007499695,0.019454956,0.043548584,-0.011688232,-0.026016235,-0.0076828003,0.0030384064,-0.020065308,0.01966858,0.035461426,-0.022644043,-0.0031414032,0.007068634,-0.017181396,-0.009117126,0.0014791489,-0.009757996,0.0025405884,-0.005622864,-0.0065193176,-0.00724411,0.011398315,0.008293152,-0.00012850761,-0.015556335,-0.020858765,0.019195557,0.041259766,0.00920105,-0.03591919,-0.0105896,0.011558533,0.014656067,-0.022750854,-0.019897461,-0.01576233,-0.033447266,0.011047363,0.027282715,0.016052246,0.014961243,-0.03161621,0.0003798008,0.0129776,0.0047683716,0.012199402,0.006652832,-0.023147583,0.0039901733,-0.013153076,-0.022735596,-0.01473999,-0.016159058,0.0059165955,0.03225708,-0.0014276505,-0.023590088,0.02015686,-0.0037326813,0.013267517,0.0011320114,-0.018325806,0.026672363,-0.008323669,-0.011230469,-0.0041389465,0.023498535,-0.02519226,-0.011726379,-0.010879517,0.039154053,0.044281006,-0.006996155,-0.01802063,0.021270752,0.01322937,0.023468018,0.0345459,0.0067596436,0.040863037,0.019546509,-0.018661499,-0.020980835,0.0154800415,-0.004837036,-0.01739502,0.011619568,-0.012908936,-0.020980835,0.022613525,0.0025596619,-0.0032787323,-0.031677246,-0.01939392,-0.0060768127,-0.015144348,0.014381409,-0.008773804,0.02130127,-0.015586853,-0.01626587,-0.0022773743,-0.0005660057,-0.05166626,-0.023223877,-0.0007224083,-0.005264282,-0.06341553,0.007843018,-0.042785645,0.01399231,-0.018966675,-0.009765625,-0.0020275116,0.03262329,-0.0011339188,0.010887146,0.0034122467,0.023010254,0.026306152,0.00806427,0.025650024,-0.023040771,-0.018005371,-0.025238037,0.012084961,-0.014450073,0.022460938,0.0022449493,0.036193848,0.022720337,0.006263733,0.00055646896,-0.010574341,-0.014122009,-0.011947632,-0.02394104,-0.024734497,0.020828247,0.00983429,-0.015792847,-0.02029419,0.043945312,-0.023483276,-0.003742218,0.019760132,0.049682617,0.006290436,0.033477783,-0.014007568,-0.0011491776,-0.008293152,0.0034427643,-0.01638794,0.014419556,0.01701355,0.01134491,-0.008224487,-0.0054397583,0.005596161,-0.012626648,-0.0035495758,0.021392822,0.0057296753,-0.011131287,0.035583496,0.01966858,0.013519287,-0.014945984,-0.013015747,0.020019531,0.037902832,0.016448975,0.012199402,0.00793457,0.0093688965,-0.0155181885,0.0070495605,-0.0037975311,-0.030670166,-0.035705566,-0.021133423,-0.025115967,0.024932861,0.010658264,0.015167236,-0.0039520264,0.01927185,-0.014251709,-0.041870117,-0.019424438,0.02142334,0.010604858,-0.009933472,-0.012321472,0.0044403076,0.014877319,-0.025024414,-0.0015115738,-0.0385437,-0.029937744,-0.0016040802,-0.021759033,0.01864624,0.0016965866,-0.014801025,0.0065231323,-0.012916565,0.002576828,-0.012672424,0.025802612,-0.016738892,0.0022792816,0.008277893,0.010032654,-0.010925293,0.013557434,-0.00029802322,0.00365448,0.02571106,-0.016937256,0.0059318542,-0.014816284,0.036468506,-0.013053894,-0.017242432,0.039367676,-0.005115509,0.014289856,-0.041137695,-0.002418518,-0.0041770935,-0.0024719238,0.04208374,-0.024551392,-0.023117065,-0.0020065308,-0.015151978,-0.024597168,-0.0035533905,0.023849487,0.03479004,-0.00068473816,0.04953003,-0.017562866,0.004020691,0.013465881,0.012557983,-0.015182495,0.0026855469,0.04525757,0.018157959,-0.0042877197,-0.006916046,-0.006755829,-0.032073975,-0.010421753,0.027572632,-0.0016489029,-0.010124207,0.032073975,-0.0035800934,0.036376953,-0.00598526,0.0071983337,0.008995056,-0.000011205673,0.0262146,-0.005027771,0.04333496,-0.0011520386,-0.033477783,0.0016441345,0.008743286,-0.021453857,-0.00094795227,-0.006336212,-0.007461548,-0.032318115,0.019577026,-0.006160736,0.018341064,-0.024719238,0.007160187,-0.017745972,-0.01134491,-0.036315918,-0.011680603,-0.040252686,-0.004650116,0.03741455,0.006023407,0.02583313,0.0014295578,-0.008163452,0.03665161,0.051483154,-0.004371643,-0.015731812,-0.023895264,-0.0022563934,-0.0077552795,0.013847351,0.023513794,-0.023269653,-0.016235352,-0.0018110275,-0.023880005,0.007511139,-0.0043678284,0.011459351,0.012557983,-0.013389587,-0.01637268,0.032287598,-0.0039520264,0.004119873,0.005542755,0.0035114288,0.04925537,0.026916504,-0.011909485,0.01260376,0.00868988,-0.034851074,0.05935669,-0.0039138794,0.030227661,-0.013648987,0.0013303757,-0.03652954,-0.019577026,-0.015640259,0.0046653748],"createdAt":"2026-04-21T18:32:23.541Z","updatedAt":"2026-04-22T01:02:18.895Z","lastSeenAt":"2026-04-22T01:02:18.895Z","tsv":"'/api':211 '/api/v1/keys/61':68,162 '/pricing':212 '/readme':214 '/request':19,38,157 '0.02':18,37,79,156 '000':83 '20':82 '402':166 '6':89 'Base network API' 'USDC API' 'access':74,188 'addit':225 'advertis':112 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,45,73,92,116,187 'attach':102 'base':8,27,63,84 'base-network' 'behind':176 'broad':50 'call':4,23,81 'caller':100 'catalog':51 'categori':114 'challeng':167 'classif':131 'confirm':168 'connect':220 'content':226 'convers':148 'cost':76 'crawl':209 'crypto-paid API' 'data':11,30,117,121,192 'data-analytics' 'decim':90 'descript':183 'detail':190,203 'document':204 'embed':132 'enabl':44 'endpoint':16,35,57,67,152,160 'estim':142 'exampl':201 'exchang':137 'export':122 'feed':136 'financ':13,32,133 'finance-data' 'found':206 'four':113 'function':175 'gas':141 'generat':149 'geocod':146 'header':106 'howev':172 'infrastructur':144 'insight':123 'key':93 'learn':126 'limit':95 'list':70,151 'live':171 'low payment fee' 'lowpaymentfee.com':39 'machin':125 'metric':119 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':198 'page':215 'particular':178 'path':179 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':105 'per':3,22,55,80 'platform':6,25,46,111 'premium':72,186 'price':135,158 'prompt':222 'provid':48 'quot':140 'rate':94,138 'report':120 'request':56,109 'request/response':200 'requir':99 'return':163,196,217 'say':185 'schema':199 'sentiment':127 'servic':194 'settl':58 'share':153 'simpli':101,184 'specif':66,174 'subscript':97 'summar':130 'text':129 'token':139 'unclear':181 'unit':85 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,145 'utility-services' 'valid':147,165 'wallet':221 'web3':134 'without':189 'x402':43,104 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a64eb1ec-9b08-4945-b4ea-6931264d1fbd","listingId":"72d4da78-64a5-4f9e-a27d-9571ce6d0e13","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/keys/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.541Z"}],"sources":[{"listingId":"72d4da78-64a5-4f9e-a27d-9571ce6d0e13","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.541Z","lastSeenAt":"2026-04-22T01:02:18.895Z"}],"details":{"listingId":"72d4da78-64a5-4f9e-a27d-9571ce6d0e13","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/61 \\\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 maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/61"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reporting endpoints without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time financial data such as token prices, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion with instant crypto payment"],"bestFor":["Developers who want pay-per-use API access without API key management","Agents and bots that can settle payments in USDC on Base via x402","Projects needing low-cost, no-commitment access to a variety of common API services"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk access at volume-discounted rates","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.636Z"},"updatedAt":"2026-04-22T01:02:18.895Z"}}