{"id":"b84853a7-f45b-4c7d-90be-55a6cf7b715e","shortId":"x8BzzK","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 exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/inbox/97` is listed as \"Premium API Access\" and returns a valid x402 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the `exact` scheme to the specified wallet address. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the actual functionality behind `/api/v1/inbox/97` (and indeed most endpoints) is unclear beyond the category labels and short names shown on the homepage.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["No request or response schema available for any endpoint","The specific endpoint /api/v1/inbox/97 has no description beyond 'Premium API Access' — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No rate limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/97","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/inbox/97","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no usage examples, and the purpose of '/api/v1/inbox/97' specifically is opaque. The site's docs pages are empty beyond wallet-connect prompts. This is effectively a stub listing.","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":"2026-04-21T21:52:45.373Z","embedding":[-0.029556274,-0.024139404,0.04043579,0.024032593,0.02696228,-0.03656006,-0.014831543,0.04284668,0.06713867,-0.06652832,0.023483276,-0.03555298,-0.019989014,-0.040618896,-0.009757996,0.020446777,0.0006637573,0.0061836243,-0.04144287,0.031280518,0.011642456,-0.008598328,-0.023269653,0.043121338,-0.0051956177,-0.02897644,-0.0087890625,-0.004135132,-0.005420685,-0.052520752,0.044158936,-0.02722168,0.004184723,0.01259613,-0.010284424,-0.0015869141,-0.003068924,0.037719727,0.024337769,-0.0077781677,-0.020050049,-0.04660034,0.0152282715,-0.01576233,-0.06347656,-0.0051727295,0.016113281,-0.004901886,0.0039520264,0.014266968,-0.030227661,0.0060653687,-0.0006275177,-0.0010328293,0.017242432,0.019927979,0.002779007,0.009468079,0.0110321045,0.021636963,0.0022010803,-0.055023193,-0.029693604,0.0021190643,-0.0058517456,0.043914795,-0.0012760162,0.04675293,0.0010757446,0.074035645,0.040985107,0.048461914,0.014083862,0.01184845,0.009002686,-0.01725769,-0.004600525,0.06060791,-0.016799927,-0.017242432,-0.018615723,-0.0151901245,-0.05758667,-0.0051498413,-0.018798828,-0.050994873,-0.009559631,0.039520264,-0.03338623,0.02128601,-0.07434082,-0.022277832,-0.026351929,0.0037250519,0.00093460083,-0.009468079,-0.0012588501,0.007713318,-0.015266418,0.033691406,-0.005027771,-0.043914795,0.015029907,-0.0015048981,0.04800415,0.038360596,0.019821167,0.011734009,0.019165039,-0.007633209,-0.049438477,0.01689148,-0.028564453,-0.015167236,0.0075149536,0.007843018,-0.0036334991,0.018295288,-0.039794922,0.015464783,-0.03475952,0.040374756,0.0014123917,0.01008606,-0.00037693977,-0.07476807,-0.011779785,-0.0026130676,-0.036132812,-0.010879517,0.017181396,0.008712769,0.02368164,-0.022262573,-0.047180176,-0.0054893494,-0.021636963,-0.01576233,-0.040252686,-0.030670166,0.037597656,-0.033325195,0.020339966,0.025527954,-0.085754395,-0.026245117,-0.050079346,-0.013664246,-0.023712158,-0.011161804,0.006416321,0.029693604,-0.028564453,-0.039611816,-0.0154953,-0.017852783,0.0146865845,0.031402588,-0.014427185,0.04208374,-0.016342163,0.016616821,0.012687683,-0.016586304,0.0018920898,0.022750854,-0.0023975372,-0.09625244,-0.07513428,-0.026916504,0.012077332,-0.026504517,-0.022445679,0.002368927,0.0044822693,-0.05722046,-0.020309448,-0.004219055,0.0034656525,-0.043273926,0.0058288574,-0.019943237,0.021026611,-0.010971069,-0.040405273,-0.0132369995,-0.011940002,0.0524292,0.014862061,0.029006958,0.028823853,-0.016540527,0.06112671,0.044403076,-0.021270752,-0.032440186,0.021560669,-0.019958496,0.02067566,0.00008660555,0.0084991455,-0.02848816,0.03543091,0.07196045,-0.013557434,-0.008995056,-0.013595581,-0.037231445,-0.053253174,-0.033477783,0.024047852,0.0050811768,-0.0015926361,0.037902832,-0.043426514,-0.04916382,-0.023269653,0.0019416809,0.010101318,0.05807495,0.011421204,0.021514893,0.020599365,0.015258789,-0.033050537,0.03793335,0.03552246,0.0019702911,-0.024154663,-0.019134521,0.03062439,0.028305054,-0.012039185,0.009895325,-0.0014686584,0.0368042,-0.007167816,0.00983429,0.011459351,-0.003873825,-0.018859863,-0.02142334,-0.017349243,0.013336182,0.014152527,-0.0146102905,-0.035217285,-0.0769043,0.050720215,0.029434204,0.048706055,0.0035266876,-0.0053863525,-0.022613525,0.0018606186,-0.054748535,0.051605225,0.07366943,0.00409317,-0.018600464,0.013580322,-0.022354126,-0.027053833,0.022399902,-0.0034160614,-0.03665161,-0.0021038055,0.012710571,-0.057281494,-0.016418457,0.008705139,0.017318726,0.062561035,-0.0062828064,-0.05218506,-0.023040771,-0.0033798218,-0.01713562,-0.027694702,0.010726929,-0.026382446,0.013214111,0.021743774,-0.0066375732,0.0234375,-0.00087690353,0.01576233,-0.0102005005,0.0118637085,-0.02809143,-0.025619507,0.0069084167,-0.0003015995,-0.03842163,0.0135269165,-0.015029907,0.068725586,-0.043151855,0.034240723,-0.010566711,0.01876831,0.027542114,0.014442444,-0.057495117,0.012329102,0.026870728,0.028121948,0.059020996,0.014976501,-0.030960083,-0.012321472,0.07861328,-0.009521484,-0.0032367706,0.011962891,-0.009895325,0.015808105,-0.012741089,-0.039764404,-0.040496826,-0.013168335,-0.024765015,0.03225708,-0.017578125,0.028900146,-0.015029907,0.011276245,-0.012771606,-0.0040893555,-0.03161621,0.032714844,-0.028747559,0.0027332306,-0.015335083,-0.033996582,0.010681152,0.0077934265,-0.009185791,-0.012931824,0.037628174,0.02772522,-0.004299164,-0.04144287,-0.03579712,-0.011161804,-0.01763916,0.028503418,0.036895752,0.019424438,0.044952393,-0.044311523,-0.0004925728,0.038116455,0.0073394775,0.044311523,0.001791954,-0.0077400208,-0.087402344,-0.04812622,-0.021743774,-0.045928955,0.017837524,0.0317688,0.0027160645,0.04248047,0.0024223328,-0.035217285,-0.070251465,0.034332275,-0.047576904,0.012207031,0.028717041,-0.008453369,-0.034301758,0.000562191,0.0013036728,0.016311646,0.03579712,0.0033569336,0.019088745,0.080566406,0.048309326,-0.0057525635,0.02116394,0.026489258,0.02267456,0.009178162,-0.020431519,-0.01626587,0.000024199486,0.034973145,-0.021362305,-0.023254395,-0.07788086,0.05996704,0.030090332,0.07763672,0.01676941,0.014411926,0.035614014,-0.0020389557,-0.00037527084,-0.026000977,-0.03616333,-0.042999268,-0.03765869,0.048339844,-0.018692017,0.0011177063,-0.018173218,0.038024902,-0.02558899,0.019195557,-0.020614624,0.039093018,-0.0066566467,0.007259369,0.008865356,0.012145996,0.048706055,0.0625,-0.0440979,0.022918701,0.022994995,-0.038269043,0.019943237,0.035217285,-0.018188477,-0.00819397,-0.06817627,-0.034606934,-0.010192871,-0.0053138733,-0.051452637,0.010215759,-0.010246277,0.008804321,0.041870117,-0.018051147,-0.0008034706,-0.009552002,-0.027145386,-0.060668945,-0.0031490326,-0.046539307,0.009811401,0.040496826,-0.027877808,-0.01689148,-0.0013656616,-0.010314941,-0.0061454773,0.009017944,0.03289795,-0.015411377,-0.04840088,0.033691406,-0.002532959,0.009391785,0.023529053,0.040100098,0.020721436,0.021453857,0.051452637,0.012519836,-0.021224976,-0.04647827,0.036010742,-0.04611206,0.0062713623,0.022109985,-0.01802063,0.016830444,-0.0011644363,-0.05255127,-0.032470703,0.009361267,-0.00356102,-0.0090408325,0.014083862,-0.026382446,-0.030532837,-0.0496521,-0.009750366,0.0052871704,0.064575195,0.022613525,-0.0040893555,-0.051818848,-0.0051231384,0.01914978,0.0029678345,0.02798462,-0.014595032,-0.011962891,-0.0054130554,-0.03137207,-0.012588501,-0.005596161,0.032165527,0.0063667297,0.0029888153,0.02571106,0.020935059,0.019165039,0.010139465,0.005718231,0.0231781,-0.0395813,-0.01626587,-0.0071792603,0.0362854,0.0098724365,-0.008682251,-0.0390625,0.040008545,0.022094727,0.033813477,-0.020812988,-0.0036525726,0.0036716461,0.021606445,0.022964478,-0.018554688,-0.01121521,-0.0042495728,-0.06262207,-0.08166504,0.0418396,-0.01878357,0.011550903,0.015609741,0.014541626,0.017303467,-0.025024414,0.028427124,0.008560181,-0.026748657,-0.004447937,-0.024475098,-0.01776123,-0.004737854,-0.008682251,-0.014205933,0.020950317,-0.001660347,0.0031261444,0.0018415451,-0.016555786,0.028671265,-0.00080013275,-0.0132751465,0.029754639,-0.0052452087,0.026672363,0.040405273,0.011550903,-0.048980713,0.030273438,-0.014137268,0.01953125,-0.006252289,0.0513916,0.04348755,0.009559631,-0.01737976,-0.0018644333,-0.01940918,-0.027740479,0.009223938,-0.00020873547,0.022445679,-0.013961792,-0.057769775,0.014045715,-0.0014286041,-0.039001465,-0.030059814,0.01828003,0.015640259,-0.04208374,0.019638062,0.01939392,0.052001953,-0.026351929,0.01789856,0.008003235,0.039001465,0.044281006,-0.0011062622,-0.016159058,0.011054993,0.005355835,0.010765076,-0.017791748,0.0057792664,0.01991272,-0.0015907288,0.02067566,0.040527344,0.01361084,-0.022888184,-0.027145386,0.0047035217,-0.018630981,-0.0132751465,0.012207031,0.030822754,0.01550293,-0.038360596,0.012260437,0.003829956,-0.01878357,-0.014251709,-0.017211914,0.038482666,0.002779007,0.00040888786,0.019622803,0.0054397583,0.013374329,-0.03656006,-0.0073051453,0.009254456,0.0075569153,-0.030456543,-0.05682373,-0.049682617,0.0077400208,0.015853882,0.008033752,0.026062012,0.029830933,-0.006454468,-0.008354187,0.019592285,0.012176514,-0.020004272,-0.006008148,-0.036499023,-0.016220093,-0.0013847351,0.008201599,-0.03074646,0.019424438,0.001953125,-0.0231781,-0.0107803345,-0.009269714,-0.003206253,-0.007835388,0.0012512207,0.053863525,0.0042266846,0.019729614,-0.018661499,-0.03375244,-0.012664795,0.003080368,0.024856567,-0.0513916,0.025741577,0.0032196045,-0.0060806274,-0.00040626526,0.0059509277,0.005836487,0.024215698,0.01953125,0.033294678,-0.04159546,0.049713135,-0.025238037,0.019317627,-0.00056505203,-0.021133423,0.0038146973,-0.025024414,-0.0046310425,0.042541504,-0.03375244,-0.023529053,-0.023391724,-0.027542114,-0.004425049,-0.048187256,0.017913818,0.035461426,0.03692627,-0.02468872,0.007713318,0.010566711,-0.0006155968,-0.009742737,-0.0020103455,-0.0019083023,0.026107788,0.023895264,0.0015029907,-0.025726318,-0.015548706,-0.021728516,-0.008560181,-0.056640625,-0.060668945,-0.01109314,0.00032305717,0.0012617111,-0.014923096,-0.036621094,-0.040130615,0.014480591,-0.03982544,0.015533447,-0.005004883,0.010864258,-0.000038564205,-0.027618408,0.0017213821,0.012512207,-0.0038928986,0.032806396,-0.0018596649,0.00034952164,-0.03768921,0.015357971,0.016052246,0.0071029663,-0.0011892319,-0.019119263,-0.004020691,-0.039886475,-0.060272217,-0.011734009,-0.016448975,-0.012565613,-0.0149002075,0.009857178,-0.05029297,0.009429932,-0.01777649,-0.01939392,0.027038574,0.0069236755,-0.012802124,-0.018356323,0.018539429,-0.0076408386,-0.015571594,-0.023803711,0.0063095093,0.011161804,0.0019950867,0.031173706,0.054901123,-0.004043579,-0.025436401,0.022384644,0.008079529,0.016601562,-0.01889038,-0.00038337708,-0.033203125,0.005794525,-0.020019531,-0.014770508,-0.04006958,-0.0031585693,0.074401855,0.01109314,-0.000005841255,-0.018463135,-0.01737976,0.008628845,0.029907227,-0.034362793,-0.0039367676,-0.025024414,0.009407043,-0.028457642,0.025482178,0.0042304993,0.025054932,-0.013145447,-0.04135132,-0.0014848709,0.0053901672,-0.005176544,-0.05834961,-0.024551392,-0.064453125,0.01159668,-0.014427185,-0.04144287,-0.0071144104,0.008514404,-0.008613586,-0.07891846,0.0046806335,0.054382324,-0.0036029816,0.028381348,-0.0045776367,0.0129852295,0.015701294,-0.013916016,0.002243042,0.020751953,-0.027450562,-0.02079773,-0.012367249,0.024612427,0.008270264,-0.010757446,0.011222839,0.0017652512,0.023361206,-0.013092041,0.023727417,-0.011787415,0.019058228,-0.015312195,0.018188477,-0.017028809,-0.010635376,0.027557373,-0.045898438,0.025650024,0.011894226,-0.009407043,-0.0071411133,0.022567749,0.03930664,-0.030090332,-0.02861023,0.009643555,-0.0024490356,0.019515991,-0.021835327,0.04385376,0.006587982,-0.01828003,0.012702942,0.0005917549,0.000729084,-0.030700684,-0.031219482,0.027053833,-0.012130737,0.01033783,-0.008621216,-0.0069236755,0.017425537,-0.006641388,0.016662598,-0.010932922,-0.0178833,-0.019577026,-0.006401062,-0.0059814453,0.012077332,0.009300232,0.02696228,0.02670288,0.02407837,-0.0042304993,-0.01637268,-0.004989624,0.032287598,-0.0013408661,0.004638672,0.03616333,0.024932861,0.012680054,0.00868988,0.003320694,-0.03656006,0.0017061234,-0.01689148,-0.015266418,0.0082473755,-0.026184082,-0.011146545,0.006641388,0.0023517609,-0.018081665,-0.028900146,0.004272461,-0.025466919,-0.018081665,-0.0037574768,0.0016565323,0.025604248,0.0065193176,0.001824379,0.0088272095,-0.0032844543,0.039123535,-0.005958557,-0.029067993,0.026046753,0.025924683,0.0234375,-0.034973145,-0.020950317,-0.00018322468,0.005558014,0.0022392273,-0.037261963,0.0053100586,0.043060303,-0.021942139,0.010116577,-0.0126571655,0.04333496,-0.012382507,0.013717651,-0.010910034,0.01914978,-0.007801056,0.01663208,-0.0345459,0.015625,0.02848816,0.015357971,-0.0151901245,-0.031799316,-0.03289795,0.031951904,0.0055618286,-0.014213562,0.05178833,0.006252289,0.022247314,-0.016174316,-0.022445679,-0.0009851456,-0.041534424,-0.023406982,0.022201538,-0.0012702942,0.007160187,0.018005371,-0.020874023,0.02368164,-0.029464722,0.007675171,0.0012054443,0.00050497055,-0.010261536,-0.010139465,-0.008293152,0.013381958,-0.024002075,-0.0077934265,0.004901886,0.057128906,0.027160645,0.04534912,0.037475586,0.0022964478,-0.002729416,-0.046203613,-0.027297974,0.0032100677,-0.024932861,0.01776123,-0.008369446,0.048858643,0.04486084,-0.001625061,0.030807495,0.047088623,0.044647217,-0.009231567,0.017562866,-0.024856567,0.0048103333,-0.007080078,0.024978638,-0.004463196,0.039794922,-0.034942627,0.02482605,0.039489746,0.016082764,-0.021102905,0.032226562,0.06298828,0.013473511,0.006958008,0.004890442,0.0005393028,-0.009208679,-0.0016145706,-0.024795532,0.044647217,0.0129776,0.066833496,0.031707764,0.00548172,-0.003353119,0.03137207,-0.030593872,-0.013648987,0.05532837,0.025238037,-0.022033691,-0.016174316,0.0042304993,-0.0008792877,-0.037719727,-0.03225708,0.0345459,-0.0035533905,0.0087509155,-0.0146484375,-0.0059928894,-0.012397766,0.011856079,0.012771606,0.010765076,-0.0023918152,0.026901245,0.021270752,0.0049552917,0.036712646,-0.00063467026,0.03579712,-0.028137207,-0.025314331,0.022201538,0.013542175,-0.008033752,-0.004928589,0.032409668,-0.0008354187,0.035980225,0.030532837,-0.02053833,0.014480591,0.018157959,0.0051498413,0.0075683594,0.07519531,0.029266357,0.0143585205,0.028961182,0.027160645,0.029037476,-0.02456665,0.025100708,-0.0026054382,0.0090408325,-0.0027484894,-0.022003174,-0.0025672913,-0.0039634705,0.019470215,-0.004180908,-0.014808655,0.0046424866,0.023727417,-0.004383087,-0.008079529,-0.004928589,0.0010471344,-0.014175415,-0.0067214966,0.02166748,-0.0234375,0.027038574,0.008178711,0.018630981,-0.014160156,0.0054893494,-0.001244545,-0.014122009,0.0017967224,0.03564453,-0.035980225,0.010154724,0.002008438,-0.003583908,-0.05340576,0.014732361,0.015602112,-0.021057129,0.026657104,0.009361267,-0.020751953,0.010955811,0.014663696,0.0027561188,0.0044441223,-0.0099487305,-0.026428223,0.023147583,0.042419434,0.0076141357,0.009132385,-0.024047852,-0.009925842,0.0011463165,-0.0077285767,-0.015266418,-0.0026664734,-0.010284424,-0.04336548,0.010093689,0.030914307,0.027954102,0.038360596,-0.013809204,-0.017578125,0.0058059692,0.03363037,0.0073432922,0.008384705,-0.0031776428,0.020996094,-0.022232056,0.046173096,0.049102783,0.013435364,0.04562378,-0.0013771057,-0.0063095093,0.0022010803,-0.019607544,0.009132385,-0.031555176,-0.004737854,-0.0030555725,0.032989502,-0.009689331,-0.027404785,0.012756348,-0.011947632,-0.028167725,-0.008918762,0.019607544,0.0022296906,0.04345703,0.04385376,0.01991272,-0.030639648,0.06311035,-0.013572693,0.04510498,0.0011396408,-0.018234253,0.05517578,0.035095215,0.026672363,0.00831604,0.007293701,-0.04660034,0.010879517,0.033081055,0.029876709,0.016921997,-0.0071868896,-0.015136719,0.0317688,-0.006668091,0.016830444,0.0034713745,-0.0047340393,0.01537323,-0.004650116,-0.0051612854,-0.00308609,0.0030822754,-0.006958008,0.03366089,-0.021820068,-0.0046920776,-0.025497437,-0.018371582,0.037872314,-0.0034675598,-0.008270264,-0.012954712,-0.020492554,0.006137848,-0.02003479,-0.025390625,0.015357971,0.02268982,-0.05407715,-0.0036468506,0.01763916,0.0033817291,-0.020446777,0.04711914,0.023391724,-0.009246826,0.009803772,0.037902832,-0.015151978,0.010681152,-0.017822266,0.033843994,0.04196167,0.010971069,-0.01586914,-0.006164551,0.016830444,-0.0067977905,0.009628296,0.032684326,0.010391235,-0.004310608,-0.008522034,-0.008903503,-0.004299164,0.005016327,-0.017608643,0.0059165955,-0.015098572,-0.006137848,0.005382538,0.0085372925,0.0043144226,0.017227173,-0.022232056,-0.009918213,0.011222839,0.05303955,0.03164673,-0.037475586,-0.003982544,-0.0060539246,0.007843018,-0.022705078,-0.0036201477,-0.011520386,-0.032470703,0.013298035,0.022384644,0.00680542,0.016433716,-0.024108887,-0.0025100708,0.023925781,0.0025577545,0.0026340485,0.0027980804,-0.017654419,0.002544403,-0.009773254,-0.004146576,-0.01537323,-0.008056641,0.0015296936,0.016921997,-0.00258255,-0.024917603,0.028305054,-0.0055007935,0.01537323,-0.0066375732,-0.0005335808,0.014015198,0.0032844543,-0.0104904175,-0.0018463135,0.016448975,-0.014556885,-0.0021800995,-0.020263672,0.017425537,0.042297363,-0.007205963,-0.003774643,0.018997192,0.024215698,0.02319336,0.049987793,0.005584717,0.039276123,0.017852783,-0.02671814,-0.023101807,0.018814087,-0.0061798096,-0.026947021,0.013427734,-0.018569946,-0.021972656,0.0209198,0.0060653687,0.0071868896,-0.023620605,-0.011512756,-0.028884888,-0.030960083,0.017547607,-0.0019741058,0.018753052,0.00007170439,-0.00655365,0.006313324,-0.020462036,-0.05895996,-0.008918762,-0.00021469593,-0.010604858,-0.06732178,0.001209259,-0.035217285,0.017120361,-0.01184082,-0.01008606,-0.023727417,0.026443481,-0.021453857,-0.0107803345,-0.0047302246,0.021438599,0.031143188,0.011146545,0.026138306,-0.03677368,-0.03692627,-0.023452759,0.012466431,-0.0069236755,0.016983032,0.004760742,0.03491211,0.005279541,-0.018066406,0.0071983337,-0.014373779,-0.003955841,-0.023391724,-0.025009155,-0.030929565,0.028961182,0.024215698,-0.0014867783,0.0030765533,0.03363037,-0.01260376,-0.002002716,0.02330017,0.037109375,0.0071792603,0.019165039,-0.020599365,-0.006668091,-0.022323608,0.005874634,-0.019210815,0.0064048767,0.007167816,0.015083313,-0.01637268,0.023651123,0.037750244,-0.007396698,-0.005138397,0.016448975,0.0051612854,-0.018829346,0.038330078,0.014755249,0.0061950684,-0.012138367,-0.0076141357,0.016998291,0.059539795,0.017181396,0.015281677,0.00095939636,0.004425049,-0.008911133,-0.0071487427,0.0057754517,-0.03768921,-0.029464722,-0.020401001,-0.031097412,0.014266968,-0.006702423,0.0054893494,-0.00819397,0.020935059,-0.009513855,-0.026947021,-0.018173218,0.037139893,-0.004463196,-0.0055885315,-0.0017652512,0.01146698,0.012969971,-0.023284912,-0.0035438538,-0.03579712,-0.050354004,-0.011962891,-0.0069885254,0.026733398,0.009117126,-0.01512146,-0.00031733513,0.0030097961,0.0059547424,-0.0045433044,0.021743774,-0.021987915,0.003206253,0.0072784424,0.01159668,-0.028671265,0.022003174,-0.019943237,-0.013046265,0.009536743,-0.0067863464,0.017150879,-0.014518738,0.04135132,0.0048675537,0.0013113022,0.03451538,0.0005836487,0.010955811,-0.025253296,0.013847351,0.0037345886,-0.01399231,0.036132812,-0.012496948,-0.015205383,-0.008895874,-0.010749817,-0.0047187805,0.007534027,0.0107803345,0.021514893,0.0035152435,0.04348755,-0.01776123,0.0017900467,0.017669678,0.008155823,-0.020690918,0.0062446594,0.029190063,0.009559631,0.0029830933,-0.003452301,-0.00018954277,-0.03866577,-0.0072402954,0.010040283,0.0074691772,-0.008712769,0.015098572,0.002281189,0.04159546,-0.005317688,0.0034675598,0.014122009,0.014717102,0.033081055,0.010917664,0.024551392,-0.013847351,-0.02078247,-0.011474609,0.0004901886,-0.023986816,0.0038280487,-0.003227234,0.0020961761,-0.039093018,0.0077934265,-0.0040130615,0.029846191,-0.0063056946,0.019866943,-0.02911377,-0.007286072,-0.042144775,-0.008163452,-0.04272461,-0.000018119812,0.028030396,-0.0026283264,0.027114868,-0.0017757416,-0.028717041,0.035888672,0.045898438,0.013870239,-0.027557373,-0.021972656,-0.0010690689,-0.0007443428,0.00541687,0.00025248528,-0.014846802,-0.025375366,-0.0025577545,-0.023422241,0.009162903,-0.015060425,0.013633728,0.013977051,0.0029754639,-0.00554657,0.018829346,-0.00049877167,-0.014015198,0.00831604,0.008590698,0.025604248,0.020553589,-0.006210327,0.021224976,0.025024414,-0.045440674,0.06402588,-0.0076942444,0.03439331,-0.011451721,0.018951416,-0.032226562,-0.040802002,-0.0045814514,-0.0015792847],"createdAt":"2026-04-21T18:32:22.278Z","updatedAt":"2026-04-22T09:02:13.431Z","lastSeenAt":"2026-04-22T09:02:13.431Z","tsv":"'/api':198 '/api/v1/inbox/97':122,221 '/pricing':199 '/readme':201 '/request':19,38 '0.02':18,37,95,145 '000':140 '20':139 '402':134 '402 payment api' '6':150 'accept':168 'access':128 'across':54 'actual':218 'addit':212 'address':165 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127 'application/json':174 'avail':183 'base':8,27,103,141,153 'base network api' 'behind':220 'beyond':228 'broad':50 'call':4,23 'catalog':51 'categori':56,230 'challeng':135 'cheap api' 'classif':71 'classification' 'commit':118 'connect':207 'content':213 'convers':88 'conversion' 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':151 'descript':193 'document':176 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,167,184,225 'estim':82 'exact':159 'exampl':196 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':219 'gas':81 'generat':89 'geocod':86 'geocoding' 'homepag':238 'http':169 'inde':223 'infrastructur':84 'insight':63 'key':111 'label':231 'land':180 'learn':66 'limit':114 'list':124,182 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':156 'metric':59 'micropayment api' 'minim':178 'name':234 'network':104 'offer':10,29 'page':181,202 'paid':98 'paramet':192 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':154 'per':3,22,96 'platform':6,25,46 'post':170 'premium':126 'price':75,93,186 'prompt':209 'protocol':108 'provid':188 'quot':80 'rate':78,113 'report':60 'request':97,136,171 'request/response':190 'resolv':204 'respons':175 'return':130,173 'schema':191 'scheme':160 'sentiment':67 'sentiment-analysis' 'short':233 'shown':235 'sinc':147 'specif':120 'specifi':163 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':227 'unit':142 'upfront':117 'usag':195 'usd':146 'usdc':9,28,100,144,148 'usdc api' 'usdc-base' 'use':149 'util':15,34,85 'valid':87,132 'validation' 'via':105,157 'wallet':164,208 'web3':74 'x402':43,107,133 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5f0363d8-1e67-4074-bce4-d4673faca164","listingId":"b84853a7-f45b-4c7d-90be-55a6cf7b715e","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/inbox/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.278Z"}],"sources":[{"listingId":"b84853a7-f45b-4c7d-90be-55a6cf7b715e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.278Z","lastSeenAt":"2026-04-22T09:02:13.431Z"}],"details":{"listingId":"b84853a7-f45b-4c7d-90be-55a6cf7b715e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/97 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/97"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a utility service paid per call in USDC"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost API calls on Base network","Web3-native applications that prefer crypto-settled API billing"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integration","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.637Z"},"updatedAt":"2026-04-22T09:02:13.431Z"}}