{"id":"a461953a-f448-4caa-805a-f4501ac510a0","shortId":"YcG94p","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no subscriptions — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/apikeys/36` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact-amount scheme. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises additional endpoints including 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. However, documentation beyond the landing page is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base usdc api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all docs/pricing/README pages return only 'Connect wallet' with no content","The specific purpose of /api/v1/apikeys/36 ('Premium API Access') is ambiguous; it is not listed among the catalog endpoints on the landing page","No request body schema or response schema is documented anywhere in the crawled material","The broader catalog of endpoints (AI, finance, utils) is advertised but none were individually probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/36","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/apikeys/36","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 payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The purpose of the specific '/api/v1/apikeys/36' endpoint labeled 'Premium API Access' is unclear — it may generate API keys or serve as a generic access point, but nothing in the crawl clarifies this.","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":"2026-04-19T15:15:47.210Z","embedding":[-0.019363403,-0.036132812,0.048309326,0.025299072,0.016281128,-0.03756714,-0.013282776,0.051727295,0.06427002,-0.06378174,0.023834229,-0.044830322,-0.029724121,-0.029800415,-0.026184082,0.011177063,-0.0066947937,-0.006275177,-0.054595947,0.031799316,0.03213501,-0.014091492,-0.00983429,0.042785645,0.011940002,-0.01965332,0.0017356873,-0.019363403,-0.010559082,-0.046722412,0.033325195,-0.019439697,-0.010231018,0.028579712,-0.016418457,-0.013343811,-0.004119873,0.03173828,0.041137695,-0.012001038,-0.00023639202,-0.06329346,0.011566162,0.0129852295,-0.055480957,-0.008514404,0.008270264,-0.028625488,-0.0058059692,0.0072364807,-0.032073975,-0.0020275116,-0.02330017,-0.009552002,0.0064201355,0.013046265,-0.019515991,-0.01966858,0.012886047,0.0020561218,0.009788513,-0.048919678,-0.015274048,0.0036525726,0.003900528,0.04626465,-0.0027389526,0.043548584,0.010597229,0.05316162,0.04626465,0.05407715,0.032165527,0.015975952,0.0027046204,-0.0015668869,-0.01777649,0.0690918,-0.007648468,-0.007675171,-0.009162903,-0.008842468,-0.041412354,0.005329132,-0.020431519,-0.053985596,-0.017120361,0.018630981,-0.012176514,0.035095215,-0.06964111,-0.014602661,-0.024612427,0.0107040405,0.015144348,0.013381958,-0.019042969,0.015090942,-0.016143799,0.020309448,0.0028476715,-0.037078857,0.00025057793,0.016738892,0.050598145,0.037139893,0.015571594,0.02720642,-0.0058784485,-0.007499695,-0.026733398,0.023040771,-0.023544312,-0.026809692,0.021331787,0.0055160522,-0.02067566,0.019973755,-0.037719727,0.008995056,-0.05508423,0.042510986,0.021408081,-0.01234436,0.022094727,-0.050231934,-0.017486572,0.014732361,-0.03186035,-0.016143799,0.025466919,0.017807007,0.038879395,-0.0075531006,-0.026168823,0.008598328,-0.0037670135,-0.011802673,-0.04660034,-0.030426025,0.037078857,-0.030441284,0.027038574,0.041931152,-0.08959961,-0.021377563,-0.060333252,0.009269714,-0.026000977,-0.0057258606,0.002412796,0.016220093,-0.025039673,-0.006061554,-0.011482239,-0.029281616,-0.011734009,0.035247803,-0.008964539,0.037902832,-0.016311646,0.050354004,0.014015198,0.004219055,0.03161621,0.034698486,-0.013496399,-0.0770874,-0.0859375,-0.047332764,-0.010528564,-0.026916504,-0.029296875,-0.0015077591,-0.003484726,-0.093811035,-0.027175903,-0.006980896,-0.0041503906,-0.027816772,-0.011009216,-0.030395508,0.009361267,-0.007507324,-0.03942871,-0.013717651,-0.031585693,0.059448242,0.017929077,0.008743286,0.03189087,-0.022338867,0.05102539,0.0041770935,-0.0055389404,-0.03265381,0.010017395,-0.012649536,0.0178833,0.017578125,0.0015640259,-0.026947021,0.03463745,0.067871094,0.009140015,-0.018493652,0.0014219284,-0.04574585,-0.0345459,-0.020858765,0.005886078,0.013259888,0.000037312508,0.038238525,-0.044036865,-0.03375244,-0.008621216,0.002653122,0.014289856,0.06439209,-0.00554657,-0.01914978,0.024902344,0.021453857,-0.046783447,0.034301758,0.037078857,0.017745972,-0.022399902,-0.015388489,0.026657104,0.031921387,-0.034820557,0.012878418,-0.03225708,0.03173828,0.00041604042,0.0021781921,0.021575928,-0.017288208,-0.026992798,-0.03527832,-0.0076904297,0.044433594,0.002729416,-0.016708374,-0.045043945,-0.07159424,0.0440979,0.028503418,0.04083252,-0.009124756,0.004699707,-0.018463135,0.0071754456,-0.06414795,0.06719971,0.092163086,-0.003320694,-0.006088257,0.013008118,-0.008995056,-0.03225708,-0.011878967,0.0026626587,-0.025558472,-0.02633667,0.036834717,-0.024368286,0.00019776821,0.013908386,0.02331543,0.053741455,-0.012786865,-0.030838013,-0.03475952,-0.0034255981,0.00020241737,-0.044403076,0.0029735565,0.009353638,0.01197052,0.0446167,-0.007144928,0.03387451,-0.010635376,0.015037537,-0.009300232,-0.015312195,-0.04248047,-0.020095825,0.017105103,0.0053710938,-0.062805176,0.0234375,-0.009597778,0.047210693,-0.038238525,0.032409668,-0.015930176,0.011253357,0.040527344,-0.01361084,-0.05230713,0.0014019012,0.030059814,0.02758789,0.04547119,0.011230469,-0.024414062,-0.00012874603,0.06695557,-0.024383545,0.0029850006,0.02003479,0.008003235,0.020690918,0.00045013428,-0.056274414,-0.037078857,-0.008056641,-0.039916992,0.026626587,-0.04348755,0.042236328,-0.010643005,-0.0040130615,-0.028182983,0.009925842,-0.039764404,0.021835327,-0.018875122,0.0025920868,-0.013366699,-0.021408081,0.0054626465,0.03375244,-0.038208008,-0.0031280518,0.03933716,0.019744873,-0.013961792,-0.036346436,-0.02330017,-0.006011963,-0.0178833,0.022659302,0.027130127,0.013793945,0.045959473,-0.034301758,0.011154175,0.021820068,0.0050811768,0.047546387,-0.009048462,0.009597778,-0.06506348,-0.046081543,-0.023132324,-0.039794922,0.02810669,0.020309448,-0.0004310608,0.049102783,0.005355835,-0.022094727,-0.039794922,0.0043296814,-0.050048828,-0.0066833496,0.03326416,-0.013008118,-0.032348633,-0.007507324,0.013038635,0.006587982,0.037506104,0.013900757,0.007858276,0.071899414,0.04550171,0.0057640076,0.027130127,0.008804321,0.017242432,0.0045204163,-0.015556335,-0.031219482,0.0074157715,0.021652222,-0.01259613,-0.012886047,-0.06427002,0.072021484,0.05114746,0.0647583,0.02545166,0.013252258,0.042144775,-0.029922485,-0.0013437271,-0.012924194,-0.016998291,-0.016189575,-0.034088135,0.025039673,-0.005744934,-0.008293152,-0.019134521,0.039276123,-0.0017728806,0.011306763,-0.03137207,0.05517578,0.00082302094,-0.015731812,0.010009766,0.008026123,0.045440674,0.036071777,-0.05291748,0.022476196,0.010650635,-0.04156494,-0.0079193115,0.04156494,0.0021209717,-0.016174316,-0.05419922,-0.03930664,-0.002653122,-0.016433716,-0.046539307,-0.010391235,0.0030822754,0.0178833,0.037597656,-0.022613525,-0.026245117,-0.0003912449,-0.024002075,-0.06286621,-0.010070801,-0.05404663,-0.0055656433,0.0309906,-0.03817749,-0.020248413,0.0061302185,0.0007352829,-0.018539429,0.013252258,0.010879517,0.007865906,-0.06085205,0.032989502,0.008178711,0.013381958,0.022247314,0.030700684,0.03829956,0.011100769,0.050048828,0.0103302,-0.017288208,-0.04458618,0.017715454,-0.051116943,0.0005569458,0.010749817,-0.010223389,-0.015838623,-0.020004272,-0.017913818,-0.02961731,0.019744873,-0.0256958,0.016723633,0.027145386,-0.04095459,-0.023834229,-0.07159424,-0.018920898,-0.028076172,0.060058594,0.027816772,-0.009231567,-0.051696777,-0.017669678,0.019882202,-0.0045814514,0.023040771,-0.014381409,-0.0031642914,0.0016517639,-0.028503418,-0.008110046,-0.029510498,0.030426025,-0.003238678,-0.005935669,0.012550354,0.024429321,0.004589081,0.0016021729,0.0107421875,0.028030396,-0.017608643,0.000057458878,-0.020446777,0.013175964,0.010116577,0.0031089783,-0.04058838,0.0440979,0.010566711,0.034606934,-0.028244019,-0.0041885376,0.001127243,0.017654419,0.02696228,-0.00969696,-0.0028305054,0.0002553463,-0.048187256,-0.072509766,0.039367676,-0.036712646,0.030426025,0.014793396,0.0077400208,0.029724121,-0.017562866,0.008483887,0.03050232,-0.031066895,-0.01637268,-0.02444458,-0.031555176,-0.0009794235,0.0087509155,-0.032287598,0.016937256,-0.017547607,-0.0020618439,-0.015350342,-0.023239136,0.023117065,0.0069770813,-0.0035629272,0.020217896,0.0052871704,0.03567505,0.046813965,0.006263733,-0.02670288,0.02154541,-0.0018043518,-0.0017118454,-0.009048462,0.045806885,0.033843994,-0.024215698,-0.010215759,0.0034255981,-0.013259888,-0.021087646,-0.005378723,0.005897522,0.022125244,0.006877899,-0.037109375,0.0056381226,0.017318726,-0.026779175,-0.015342712,0.017593384,0.01626587,-0.022842407,0.03805542,0.026153564,0.05493164,-0.013641357,0.005504608,-0.0024662018,0.039489746,0.030807495,0.012016296,-0.02218628,0.018096924,-0.0059051514,0.017211914,-0.008743286,0.002407074,0.021392822,-0.008605957,0.008003235,0.019927979,0.016540527,-0.028320312,-0.035888672,0.009292603,-0.006385803,-0.0132369995,0.020706177,0.023391724,0.008399963,-0.018798828,0.028167725,0.022491455,-0.026123047,-0.016433716,-0.021621704,0.05065918,-0.0025234222,-0.012130737,0.017822266,0.0020599365,0.017211914,-0.05114746,-0.0047035217,0.013259888,0.017456055,-0.035827637,-0.049224854,-0.041168213,0.003993988,0.030059814,0.010299683,0.030029297,0.027282715,0.002861023,0.0008225441,0.02772522,-0.0018672943,-0.011329651,-0.015106201,-0.04776001,-0.007080078,-0.013771057,0.0027713776,-0.022232056,0.019058228,-0.010604858,-0.02330017,0.0049819946,-0.003189087,-0.01676941,-0.0068130493,0.0102005005,0.029205322,0.0038890839,0.016738892,-0.027877808,-0.01423645,0.005569458,0.010147095,0.0041999817,-0.04019165,0.018127441,-0.014480591,-0.008018494,-0.009506226,0.01638794,0.023895264,0.018722534,0.005115509,0.02696228,-0.040283203,0.028808594,-0.048034668,0.024551392,-0.002773285,-0.027694702,-0.00374794,-0.02168274,-0.016082764,0.033477783,-0.01663208,-0.000015974045,-0.029464722,-0.03062439,-0.0058784485,-0.04852295,0.011329651,0.03677368,0.03579712,-0.043640137,0.0019321442,0.00016200542,0.0071640015,-0.014884949,0.015838623,-0.011001587,0.024002075,0.016326904,0.0048294067,-0.014144897,-0.017608643,-0.011779785,-0.010787964,-0.038360596,-0.04534912,-0.022216797,0.013977051,-0.00046515465,-0.0018100739,-0.0289917,-0.026168823,0.004535675,-0.028961182,0.014183044,-0.00020229816,0.010421753,0.0107421875,-0.0073013306,0.0033359528,0.031341553,-0.02709961,0.033416748,0.011138916,-0.008399963,-0.044311523,-0.007980347,0.037109375,0.027359009,-0.0033740997,-0.012321472,-0.007713318,-0.022216797,-0.057373047,-0.012672424,-0.0018053055,0.008407593,0.00051403046,0.003791809,-0.057250977,-0.010093689,-0.021026611,-0.003604889,0.031402588,0.036499023,0.016342163,0.00045704842,0.01473999,-0.0068969727,-0.0043029785,-0.038024902,0.0018882751,0.0104522705,0.0051193237,0.022644043,0.0473938,0.007671356,-0.017227173,0.009811401,0.0008072853,0.019500732,-0.0141067505,0.003194809,-0.02810669,0.0149383545,-0.00039172173,-0.017822266,-0.034820557,-0.005592346,0.085510254,-0.0008249283,-0.011657715,-0.0010766983,-0.01838684,0.021942139,0.029846191,-0.05596924,-0.008842468,-0.031204224,0.014015198,-0.015083313,0.014144897,0.0015420914,0.014770508,-0.0137786865,-0.05834961,-0.0129776,0.001581192,-0.009033203,-0.05203247,-0.028778076,-0.045928955,-0.01322937,-0.009048462,-0.020614624,-0.0038471222,0.012565613,-0.019073486,-0.07397461,0.017181396,0.04901123,0.012908936,0.027435303,-0.01600647,0.0031204224,0.022857666,-0.03213501,-0.012435913,0.020828247,-0.030471802,-0.03036499,-0.029174805,0.027252197,-0.019378662,-0.018753052,0.030288696,0.004589081,0.024719238,-0.0044937134,0.019454956,-0.006877899,0.020553589,-0.02178955,0.0118255615,-0.004436493,0.0024204254,0.021240234,-0.044525146,0.014442444,0.017669678,-0.0035820007,0.0013141632,0.025360107,0.040893555,-0.041748047,-0.014419556,0.021652222,0.0016260147,0.039611816,-0.02684021,0.05291748,0.01689148,-0.024215698,0.018615723,-0.009674072,-0.031280518,-0.039245605,-0.036712646,0.027023315,0.01525116,0.022415161,-0.0044174194,-0.0012207031,0.019989014,-0.008232117,0.0079422,-0.018218994,-0.013824463,-0.019927979,-0.0024604797,-0.006801605,-0.00009548664,-0.004299164,0.025299072,0.026428223,0.04638672,0.0017957687,-0.00957489,0.009269714,0.0206604,-0.015777588,-0.00009441376,0.020217896,0.007144928,0.009857178,0.01525116,0.007106781,-0.04348755,-0.018173218,-0.037475586,-0.0044441223,0.0054626465,-0.0075263977,-0.009223938,-0.0075416565,-0.0024986267,-0.0039482117,-0.030853271,0.022018433,-0.04647827,-0.025436401,0.0059547424,-0.023605347,0.016738892,0.014122009,0.007282257,0.0155181885,-0.00040531158,0.058288574,0.009399414,0.0003297329,0.034454346,0.038085938,0.018585205,-0.034851074,-0.008132935,0.0008687973,-0.0013656616,0.0047187805,-0.03817749,0.017868042,0.043670654,-0.02973938,0.015533447,-0.0005378723,0.015342712,-0.016906738,-0.006034851,-0.007965088,0.012580872,-0.015419006,0.031829834,-0.044311523,0.006652832,0.010269165,0.0066566467,-0.007331848,-0.023773193,-0.02166748,0.007545471,0.00039935112,-0.017578125,0.046051025,0.0012722015,0.034118652,-0.019165039,-0.026443481,0.011009216,-0.036499023,-0.027908325,0.04373169,-0.02230835,-0.010375977,0.01725769,-0.022705078,0.045715332,-0.03111267,0.008972168,0.016357422,-0.0028190613,-0.011451721,-0.003129959,-0.020263672,-0.008293152,-0.007827759,-0.01576233,-0.0051231384,0.05078125,0.016693115,0.031402588,0.047943115,0.019180298,0.0076293945,-0.04385376,-0.026657104,-0.0012969971,-0.030517578,0.016967773,-0.003364563,0.058807373,0.02973938,-0.004142761,0.025863647,0.02798462,0.025131226,-0.0014629364,0.010559082,-0.025436401,0.019104004,-0.009994507,0.033599854,0.0061302185,0.04434204,-0.041748047,0.001958847,0.0074768066,0.007396698,-0.024810791,0.0418396,0.06512451,0.022064209,-0.010536194,0.037506104,-0.005340576,-0.01133728,-0.012878418,-0.012268066,0.06072998,0.028884888,0.048919678,0.050811768,0.007881165,0.0004618168,0.024383545,-0.0309906,-0.040985107,0.07080078,0.027664185,-0.034088135,-0.018676758,-0.0016956329,0.00919342,-0.048583984,-0.03604126,0.019744873,-0.007499695,-0.005218506,-0.011039734,-0.004760742,-0.007949829,0.012512207,0.026550293,0.0124435425,-0.009651184,0.03186035,0.022262573,0.007888794,0.029434204,-0.0011081696,0.031951904,-0.029129028,-0.014442444,0.01676941,0.020355225,-0.01084137,-0.007534027,0.017837524,0.009391785,0.042541504,0.04034424,-0.024108887,0.008018494,0.021469116,0.01651001,0.013641357,0.05429077,0.036468506,0.011161804,0.033416748,0.036010742,0.025802612,-0.035583496,0.0019321442,0.0009560585,0.0027160645,-0.007572174,-0.0154800415,0.000641346,-0.009788513,0.017929077,-0.0011854172,-0.0073890686,0.025314331,0.022354126,-0.004535675,0.00020968914,-0.016937256,-0.00048017502,-0.023590088,0.0027828217,0.023529053,-0.01876831,0.035125732,0.015312195,0.021835327,-0.039794922,0.014602661,-0.0031280518,-0.01789856,-0.0002696514,0.017364502,-0.05126953,0.004436493,-0.009025574,0.00091314316,-0.04385376,0.014457703,0.038635254,-0.015510559,0.035461426,0.01399231,-0.010475159,0.00027799606,0.02331543,0.0025291443,-0.005924225,-0.006969452,-0.029876709,0.023635864,0.03793335,0.0038089752,0.022857666,-0.02079773,-0.009346008,-0.0024604797,-0.01586914,0.008651733,-0.009727478,-0.024169922,-0.01977539,0.01612854,0.039611816,0.014442444,0.032287598,-0.010612488,-0.017456055,0.014976501,0.027999878,0.011238098,0.0068473816,-0.009017944,0.037750244,-0.009140015,0.039398193,0.040893555,-0.0041770935,0.021728516,-0.012023926,-0.01651001,0.014572144,-0.015930176,0.02267456,-0.013938904,0.008735657,-0.009536743,0.03488159,-0.010002136,-0.028503418,0.00541687,-0.014259338,-0.008659363,-0.022262573,0.015808105,-0.00012814999,0.024612427,0.047973633,0.019989014,-0.031463623,0.059692383,-0.016952515,0.04626465,-0.014389038,-0.0060195923,0.052856445,0.03161621,0.03451538,0.015457153,0.015548706,-0.025039673,0.011436462,0.04559326,0.031829834,-0.0017700195,0.016204834,-0.014274597,0.035949707,0.009536743,0.034057617,-0.006252289,-0.0077667236,-0.000105559826,-0.007118225,-0.008956909,0.0038318634,-0.006454468,0.005065918,0.047332764,-0.035186768,-0.0062026978,-0.026992798,-0.016647339,0.02319336,-0.009765625,0.005279541,-0.00944519,-0.032318115,0.010772705,-0.022872925,-0.00642395,0.013458252,0.028762817,-0.049316406,-0.017181396,0.006511688,0.019836426,-0.030807495,0.024246216,0.031433105,-0.0022182465,0.009773254,0.04928589,-0.0059051514,0.040374756,-0.0020618439,0.024963379,0.036590576,0.0057258606,-0.013122559,0.009086609,0.010971069,-0.016662598,0.011161804,0.032165527,-0.010421753,-0.005256653,-0.00073099136,-0.008354187,0.0014038086,0.016342163,-0.0074539185,-0.0014448166,-0.0041007996,-0.009460449,-0.0035171509,0.009529114,0.009002686,0.008651733,-0.013259888,-0.008659363,0.022003174,0.031951904,0.009971619,-0.030075073,-0.007949829,0.008270264,0.012535095,-0.008155823,-0.024353027,-0.010238647,-0.040039062,0.01374054,0.014976501,0.0055274963,-0.000108003616,-0.02243042,-0.0007338524,0.027282715,0.01109314,-0.0039749146,0.0008597374,-0.0154953,0.00036978722,-0.013328552,-0.010536194,-0.014213562,-0.0049362183,0.016967773,0.025604248,-0.0066947937,-0.030334473,0.030761719,0.007293701,0.013381958,-0.00868988,-0.0121154785,0.029724121,-0.009757996,-0.011703491,0.0032978058,0.02178955,-0.00907135,-0.0068893433,-0.01852417,0.032562256,0.053253174,-0.0067825317,-0.011672974,0.020004272,0.0088272095,0.014976501,0.036010742,0.007106781,0.04083252,0.02470398,-0.011497498,-0.017074585,0.022476196,-0.019866943,-0.03375244,0.011459351,-0.006401062,-0.016799927,0.024887085,0.00756073,-0.016464233,-0.033813477,-0.012863159,-0.006095886,-0.0118255615,0.029022217,-0.02180481,0.015052795,-0.019302368,-0.004425049,0.0054779053,-0.008529663,-0.03933716,-0.008705139,0.0022659302,-0.012245178,-0.048339844,0.005596161,-0.027648926,0.008918762,-0.013938904,-0.016448975,-0.0023956299,0.025985718,-0.018722534,-0.0002720356,-0.00680542,0.021469116,0.017196655,0.00070762634,0.027145386,-0.015777588,-0.029281616,-0.02658081,0.006652832,-0.015197754,0.024398804,0.003610611,0.049041748,0.011253357,-0.0135650635,-0.004135132,-0.0053901672,-0.002521515,-0.020584106,-0.022842407,-0.029251099,0.013046265,0.021453857,-0.0013017654,-0.006629944,0.048858643,-0.023590088,-0.014083862,0.017837524,0.048797607,0.0077590942,0.029953003,-0.010482788,-0.00774765,-0.014701843,0.000562191,-0.022109985,0.004470825,0.018493652,0.0022296906,-0.00028657913,-0.011924744,0.029724121,-0.023498535,-0.0053138733,0.027877808,-0.0038604736,-0.018814087,0.034576416,0.022781372,-0.00015997887,-0.0128479,-0.014038086,0.010314941,0.0390625,0.015655518,0.008049011,0.0017824173,0.006916046,-0.011993408,0.009460449,0.01473999,-0.023422241,-0.037322998,-0.03062439,-0.05102539,0.023117065,0.009162903,0.017837524,-0.006454468,0.021591187,-0.021484375,-0.034729004,-0.011940002,0.026870728,0.0126953125,-0.013793945,-0.011054993,0.0032844543,0.012191772,-0.024414062,0.0011472702,-0.03668213,-0.035827637,-0.009895325,-0.016311646,0.026351929,0.014770508,-0.005420685,0.006061554,0.0061416626,0.014587402,0.00039362907,0.03366089,-0.009651184,-0.00415802,0.011672974,0.008338928,-0.021942139,0.011352539,-0.0054130554,-0.0037059784,0.01878357,-0.01713562,0.015777588,-0.015731812,0.025482178,-0.005470276,0.005592346,0.030136108,0.0036525726,0.0070343018,-0.026306152,-0.0044403076,0.01134491,0.001958847,0.032348633,-0.016799927,-0.027694702,0.010055542,-0.020874023,-0.0289917,0.0032615662,0.02507019,0.03062439,-0.0095825195,0.04019165,-0.014640808,-0.006652832,0.017120361,0.005332947,-0.016357422,-0.0042304993,0.053833008,0.0010643005,-0.0015172958,-0.0039749146,0.0012044907,-0.033966064,-0.009788513,0.008895874,-0.0015058517,-0.02015686,0.0289917,0.00793457,0.044189453,-0.005104065,0.015625,0.011116028,0.0018053055,0.02684021,0.007083893,0.039093018,-0.0022678375,-0.024429321,0.011917114,0.01399231,-0.0206604,0.009056091,0.0049819946,0.012550354,-0.041412354,0.017211914,-0.008178711,0.03161621,-0.028869629,0.015960693,-0.02784729,-0.016189575,-0.026611328,-0.004764557,-0.036071777,0.0126953125,0.03817749,0.008361816,0.023040771,0.0049057007,-0.03201294,0.031402588,0.053619385,0.0036239624,-0.033355713,-0.023513794,0.017822266,-0.0012903214,-0.016799927,0.017913818,-0.024353027,-0.010482788,0.0007715225,-0.018676758,0.009529114,-0.001326561,0.012680054,0.009483337,-0.012023926,0.001657486,0.020736694,0.0013694763,-0.004840851,0.007183075,-0.0027179718,0.03567505,0.02722168,-0.014678955,0.020507812,0.025146484,-0.040374756,0.05783081,-0.015556335,0.0137786865,-0.015808105,0.007888794,-0.04348755,-0.024734497,-0.0059928894,0.0075187683],"createdAt":"2026-04-18T19:29:22.913Z","updatedAt":"2026-04-22T12:04:51.219Z","lastSeenAt":"2026-04-22T12:04:51.219Z","tsv":"'/api/v1/apikeys/36':94 '0.02':9,22,59,116,170 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':125 '20':109 '402':104 '402 payment api' 'accept':134 'access':3,16,100 'addit':144 'address':124 'advertis':143 'ai/ml':49 'amount':130 'analysi':148 'analyt':48 'api':2,15,33,72,99,184 'application/json':139 'attach':82 'avail':210 'base':8,21,67,111,118 'base usdc api' 'beyond':175 'broad':38 'broader':141 'call':44 'caller':80 'catalog':39 'challeng':105 'classif':151 'connect':193 'convers':163 'cost':58 'crawl':213 'data':47,52 'detail':200 'doc':183 'document':174 'embed':152 'enabl':32 'endpoint':45,57,92,133,145 'estim':160 'everi':56 'exact':129 'exact-amount':128 'exampl':208 'exchang':155 'extrem':180 'feed':154 'finance/web3':51 'gas':159 'generat':165 'geocod':161 'header':86 'howev':173 'i.e':115 'includ':146 'infer':50 'infrastructur':54 'json-api' 'key':73 'land':177 'limit':76 'list':96 'low payment fee' 'lowpaymentfee.com':27 'made':122 'materi':214 'micropay':6,19 'micropayment api' 'network':68 'no-api-key' 'no-rate-limit' 'offer':36 'openapi':202 'page':178,188 'pay':42 'pay-per-cal':41 'pay-per-call api' 'pay-per-request' 'payment':85,120 'per':10,23,43,60 'platform':34,142 'point':172 'post':135 'post-method' 'premium':1,14,98 'price':153,171,185 'prompt':195 'quot':158 'rate':75,156 'readm':187 'render':190 'request':11,24,61,89,106,136 'request/response':204 'return':102,138 'schema':205 'scheme':131 'sentiment':147 'settl':62 'simpli':81 'span':46 'spars':181 'spec':203 'specif':91 'subscript':79 'summar':150 'technic':199 'text':149 'token':157 'unit':112 'usag':207 'usdc':13,26,64,114 'usdc-base' 'use':126 'util':55 'valid':162 'via':4,17 'wallet':194 'x402':5,18,31,84 'x402 api' 'x402-enabled':30 'x402-payment'","prices":[{"id":"53673e4a-9082-43cc-80ec-ea94882c8d0f","listingId":"a461953a-f448-4caa-805a-f4501ac510a0","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/apikeys/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:22.913Z"}],"sources":[{"listingId":"a461953a-f448-4caa-805a-f4501ac510a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:22.913Z","lastSeenAt":"2026-04-22T12:04:51.219Z"}],"details":{"listingId":"a461953a-f448-4caa-805a-f4501ac510a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/36 \\\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 cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/36"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/36"},{"claim":"The platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to a variety of utility and data endpoints with crypto micropayments","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base per-call","Use cases requiring low-friction, keyless API access at $0.02/request"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.471Z"},"updatedAt":"2026-04-22T12:04:51.219Z"}}