{"id":"62e11378-24e2-4a57-b349-e31f1dceb069","shortId":"UuwaH5","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no subscriptions required. The x402 payment protocol handles authentication: callers include an X-PAYMENT header with a signed USDC payment, and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/invoices/48` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. The broader platform advertises categories including metrics, reports, data export, insights, 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.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind each endpoint is unclear beyond the category labels on the landing page.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/invoices/48 has no description of what it actually does beyond 'Premium API Access'","Cannot verify what data or service any endpoint actually returns without paying","Platform appears to be a demo or early-stage project with placeholder documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/48","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/invoices/48","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 spec, no request/response schema, no documentation beyond category labels, and no examples. The actual functionality of /api/v1/invoices/48 is entirely opaque — 'Premium API Access' is not descriptive. The docs pages are empty.","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":"2026-04-18T22:51:33.524Z","embedding":[-0.03036499,-0.033843994,0.029312134,0.009803772,0.014968872,-0.020690918,-0.027664185,0.03036499,0.06866455,-0.062286377,0.021621704,-0.04827881,-0.038482666,-0.026016235,-0.015281677,0.019470215,0.0023498535,0.0048332214,-0.028335571,0.03692627,0.028396606,-0.0055160522,-0.029891968,0.035217285,-0.001748085,-0.013877869,-0.008758545,-0.0020771027,-0.010627747,-0.045043945,0.036834717,-0.028701782,-0.0069274902,0.014076233,-0.008613586,-0.007637024,-0.0044288635,0.03842163,0.026657104,-0.004432678,-0.008079529,-0.060668945,0.012161255,-0.01727295,-0.046051025,0.008392334,0.012123108,-0.018478394,-0.0023078918,0.0011844635,-0.04324341,0.0049095154,0.0011062622,-0.0041503906,0.0070648193,0.012451172,0.0011167526,-0.005470276,0.0015668869,0.014854431,0.009590149,-0.062347412,-0.026184082,-0.007774353,0.0023117065,0.061401367,-0.011940002,0.039123535,0.011772156,0.066101074,0.032928467,0.061553955,0.03955078,0.008262634,0.003227234,-0.022766113,-0.007522583,0.057769775,-0.0128479,-0.020980835,-0.009056091,-0.010856628,-0.061706543,-0.00029563904,-0.02279663,-0.054534912,-0.02507019,0.019241333,-0.016281128,0.02229309,-0.070495605,-0.0012922287,-0.020050049,-0.00623703,0.009651184,-0.0077934265,-0.015045166,0.017288208,-0.010414124,0.013687134,0.00032043457,-0.03866577,0.022323608,0.008720398,0.037963867,0.05380249,0.021148682,0.013031006,0.0066604614,-0.013092041,-0.025817871,0.029708862,-0.015586853,-0.022109985,0.010559082,-0.0040779114,-0.023406982,0.010437012,-0.027160645,0.016799927,-0.0541687,0.05029297,0.0028305054,0.0129470825,0.0066375732,-0.039642334,-0.02507019,0.015419006,-0.018051147,0.0051841736,0.024246216,0.015258789,0.026290894,-0.023483276,-0.029418945,0.017044067,-0.023483276,-0.010276794,-0.047332764,-0.030807495,0.047454834,-0.020050049,0.023147583,0.034332275,-0.09832764,-0.0074386597,-0.045532227,0.0113220215,-0.039276123,-0.008522034,-0.0058555603,0.028701782,-0.01966858,-0.027236938,-0.035247803,-0.019927979,0.00061893463,0.02999878,-0.0032291412,0.043426514,-0.021224976,0.017990112,0.018554688,-0.0028438568,0.022979736,0.02192688,-0.0027046204,-0.07757568,-0.07684326,-0.02607727,-0.013893127,-0.017929077,-0.018493652,0.007686615,0.012214661,-0.073791504,-0.02494812,-0.02394104,0.0024795532,-0.045806885,0.0057640076,-0.020233154,0.018630981,-0.007873535,-0.052764893,-0.02357483,-0.03277588,0.047424316,0.03652954,0.029434204,0.02784729,-0.024505615,0.050872803,0.025970459,-0.016967773,-0.018859863,0.0158844,-0.024780273,0.011779785,0.0035419464,0.012207031,-0.020263672,0.03540039,0.07171631,-0.00074768066,-0.017608643,-0.0058174133,-0.054473877,-0.046203613,-0.03390503,0.021224976,0.01953125,-0.012763977,0.019973755,-0.044555664,-0.038269043,0.007221222,0.026184082,0.021316528,0.05569458,0.0138549805,-0.008293152,0.023376465,0.022659302,-0.041931152,0.044921875,0.029129028,0.0107421875,-0.027450562,-0.0413208,0.027267456,0.03668213,-0.029678345,0.016403198,-0.024353027,0.021713257,-0.0036373138,0.0010318756,0.014434814,-0.00048661232,-0.02583313,-0.036010742,-0.00932312,0.025619507,0.018981934,-0.02458191,-0.04046631,-0.06719971,0.055633545,0.034332275,0.039855957,0.0067367554,0.0017976761,-0.01247406,-0.009338379,-0.077941895,0.064575195,0.07543945,-0.006614685,-0.011497498,0.02217102,-0.003107071,-0.035736084,0.008125305,-0.014129639,-0.023284912,-0.02658081,0.018814087,-0.046844482,-0.0010023117,0.016235352,0.025787354,0.052368164,-0.004825592,-0.054229736,-0.017852783,-0.0068244934,0.0031280518,-0.030593872,0.0048065186,-0.007972717,0.019363403,0.021347046,0.007575989,0.01524353,-0.0030593872,0.0039711,-0.00096178055,0.0070533752,-0.011459351,-0.024642944,0.027664185,0.004360199,-0.054626465,0.008926392,-0.012527466,0.06616211,-0.06536865,0.04473877,-0.012535095,0.019729614,0.0440979,-0.0041618347,-0.036743164,0.0022735596,0.03375244,0.016326904,0.060668945,0.020126343,-0.015533447,-0.011711121,0.07019043,-0.008346558,0.002784729,0.02078247,0.029647827,0.04663086,-0.003850937,-0.05105591,-0.04095459,-0.003276825,-0.02279663,0.03250122,-0.021392822,0.03189087,-0.009735107,0.008285522,-0.023956299,-0.009803772,-0.031219482,0.016830444,-0.00920105,0.0032215118,-0.017044067,-0.032470703,0.0076408386,0.010948181,-0.015098572,0.0033893585,0.040100098,0.026062012,-0.014167786,-0.036956787,-0.037841797,-0.014762878,-0.0084991455,0.008796692,0.033294678,0.031021118,0.05038452,-0.042663574,0.00066280365,0.02645874,0.0028705597,0.039093018,0.013999939,-0.00032234192,-0.06341553,-0.054016113,-0.025360107,-0.043060303,0.02357483,0.018432617,-0.005016327,0.054229736,0.0043411255,-0.013244629,-0.044677734,0.009300232,-0.0423584,0.010177612,0.054779053,-0.025161743,-0.03466797,0.01675415,-0.00048542023,-0.0026626587,0.02760315,0.01524353,0.022109985,0.072387695,0.036315918,0.014968872,0.018051147,0.01411438,0.02822876,0.0026378632,-0.018829346,-0.015022278,-0.010253906,0.03643799,-0.029830933,-0.021469116,-0.06414795,0.05609131,0.03527832,0.08807373,0.015960693,0.004470825,0.041931152,-0.0116119385,0.01651001,-0.026641846,-0.013114929,-0.039520264,-0.042114258,0.036376953,-0.018234253,-0.005580902,-0.02671814,0.030380249,-0.0113220215,0.011512756,-0.027740479,0.04269409,-0.016586304,-0.00579834,0.015777588,0.023117065,0.054748535,0.053466797,-0.03756714,0.0154418945,0.008041382,-0.0256958,-0.0041656494,0.030334473,-0.018600464,-0.012535095,-0.053527832,-0.03225708,-0.025741577,-0.011375427,-0.060668945,-0.008934021,-0.013832092,0.022491455,0.024505615,0.0027446747,-0.019119263,0.0064086914,-0.019927979,-0.046173096,-0.0023765564,-0.05050659,-0.002828598,0.03918457,-0.020446777,-0.00006604195,-0.009628296,0.0042266846,-0.0044174194,0.012535095,0.022125244,0.004085541,-0.05657959,0.030181885,0.009742737,-0.0041999817,0.0035324097,0.028869629,0.0362854,0.025772095,0.046661377,0.019714355,-0.017440796,-0.05923462,0.025222778,-0.043182373,0.00078964233,0.020843506,-0.024490356,0.0025997162,-0.020324707,-0.025177002,-0.023529053,0.013946533,-0.017486572,-0.00043964386,0.03125,-0.018814087,-0.022888184,-0.057678223,-0.032073975,-0.010467529,0.07293701,0.026657104,-0.0004930496,-0.054595947,-0.015205383,0.008079529,0.008514404,0.038391113,-0.014526367,-0.0005288124,-0.022735596,-0.04574585,-0.007247925,-0.017181396,0.02456665,0.0010948181,-0.0079422,0.03933716,0.010536194,0.023651123,0.009414673,0.012687683,0.024429321,-0.023086548,0.00008571148,-0.017425537,0.032684326,0.016220093,0.0031814575,-0.05001831,0.05239868,0.005455017,0.032684326,-0.043121338,-0.008201599,-0.0077934265,0.015037537,0.019973755,-0.014442444,0.00004053116,-0.00019705296,-0.047424316,-0.061767578,0.043273926,-0.023391724,0.032409668,0.026657104,0.008255005,0.026275635,-0.008155823,0.0020809174,0.0152282715,-0.02684021,-0.0022296906,-0.01701355,-0.036712646,-0.018569946,-0.018707275,-0.027557373,0.027297974,-0.016647339,0.023742676,-0.007221222,-0.034973145,0.030776978,0.00034618378,-0.000005841255,0.02229309,0.0035629272,0.01991272,0.041412354,0.014717102,-0.037322998,0.030853271,0.00057029724,0.009941101,-0.0135650635,0.040100098,0.026870728,-0.0064964294,-0.006965637,-0.0066108704,-0.009719849,-0.027557373,0.007144928,0.014442444,0.010185242,0.004840851,-0.024383545,0.0049972534,-0.0010156631,-0.020599365,-0.031829834,0.0022144318,0.018920898,-0.041046143,0.012512207,0.024307251,0.048828125,-0.024673462,0.008834839,0.0022258759,0.0309906,0.039855957,0.012023926,-0.008842468,0.0287323,-0.007484436,0.008369446,-0.0040283203,-0.018600464,0.015533447,0.0062713623,0.021850586,0.030807495,0.00063848495,-0.016174316,-0.029052734,0.008842468,-0.022247314,-0.029174805,0.028945923,0.023956299,0.035949707,-0.02810669,0.022369385,0.019241333,-0.022476196,-0.0151901245,-0.018951416,0.04031372,-0.009498596,-0.008934021,0.013160706,0.020523071,0.028762817,-0.06866455,0.0007882118,0.0011005402,0.009544373,-0.022842407,-0.03967285,-0.04055786,-0.010848999,0.037109375,0.01058197,0.028213501,0.035217285,0.0031490326,0.008865356,0.017532349,-0.006126404,-0.0073394775,-0.011421204,-0.049224854,-0.015129089,-0.0068244934,0.0011167526,-0.033569336,0.019165039,-0.00548172,-0.02583313,0.008392334,-0.019622803,-0.0034008026,-0.0074386597,0.01020813,0.04083252,0.006290436,0.017028809,-0.013053894,-0.030548096,-0.00028586388,0.0031642914,0.023834229,-0.04220581,0.0073013306,-0.008705139,-0.004360199,0.0022716522,0.0072631836,0.01826477,0.033233643,0.009254456,0.043945312,-0.03933716,0.049560547,-0.03765869,0.010139465,-0.0063438416,-0.022079468,-0.015075684,-0.017059326,-0.0033512115,0.03970337,-0.027862549,-0.0030288696,-0.020324707,-0.044036865,-0.024032593,-0.057250977,0.012069702,0.027755737,0.04547119,-0.03753662,0.002796173,0.0043678284,0.010314941,-0.025985718,-0.000667572,-0.01928711,0.024719238,0.016860962,0.005428314,-0.02420044,-0.02796936,-0.01940918,0.003824234,-0.042388916,-0.04626465,-0.010116577,0.0012683868,-0.0061798096,-0.012367249,-0.0309906,-0.037506104,0.0068626404,-0.034454346,0.014877319,0.0049972534,0.0209198,0.0039749146,-0.025650024,0.0007805824,0.010848999,-0.020202637,0.034698486,0.00617218,-0.014091492,-0.031021118,0.0012283325,0.018997192,0.012619019,-0.00020241737,-0.017837524,-0.005935669,-0.024429321,-0.053588867,0.0062408447,-0.0058288574,-0.0016212463,-0.008766174,0.016296387,-0.061828613,-0.005344391,-0.033996582,0.0015563965,0.02609253,0.01676941,0.0072746277,-0.0004169941,0.004924774,-0.00605011,-0.010177612,-0.03756714,0.015945435,0.010772705,0.004497528,0.03250122,0.04498291,-0.0003502369,-0.015350342,0.009384155,0.010177612,0.019088745,-0.022735596,0.0051345825,-0.02330017,0.010856628,-0.009925842,-0.009162903,-0.033813477,0.0082092285,0.07885742,-0.0064430237,-0.0068740845,-0.017227173,-0.019500732,0.01637268,0.03829956,-0.04272461,-0.0061416626,-0.034484863,0.011413574,-0.023391724,0.017440796,-0.0012397766,0.021621704,-0.019470215,-0.05432129,-0.021743774,-0.0077590942,-0.018112183,-0.059814453,-0.03488159,-0.082214355,0.01612854,-0.015205383,-0.02557373,-0.010894775,0.01838684,-0.026351929,-0.0715332,-0.0024471283,0.051330566,-0.0018091202,0.032562256,-0.0014209747,0.017089844,0.032562256,-0.03793335,0.0022258759,0.019424438,-0.030441284,-0.018463135,-0.024230957,0.027160645,-0.0099487305,-0.015090942,0.011962891,0.015975952,0.0115356445,-0.009170532,0.012313843,-0.008171082,0.011138916,-0.008972168,0.015533447,-0.017822266,-0.015510559,0.046783447,-0.058258057,0.023452759,0.002149582,-0.012313843,0.0016431808,0.047943115,0.04083252,-0.034057617,-0.020568848,0.021530151,0.02166748,0.028076172,-0.022094727,0.038635254,0.0072669983,-0.014862061,0.012634277,-0.014762878,-0.014205933,-0.028411865,-0.031982422,0.01914978,0.0035095215,0.01828003,-0.015319824,0.00617218,0.01272583,0.010818481,0.0011081696,-0.016662598,-0.022827148,-0.013656616,0.006801605,-0.0006799698,0.007972717,-0.007293701,0.026733398,0.0357666,0.030517578,0.0019931793,-0.019058228,0.008171082,0.028656006,-0.0121154785,-0.0029354095,0.030075073,0.0031852722,0.01928711,0.022827148,0.013557434,-0.04727173,-0.016799927,-0.017593384,-0.015670776,-0.0013780594,-0.011169434,0.004005432,-0.0010261536,-0.0035858154,-0.013191223,-0.019897461,0.008934021,-0.039093018,-0.024307251,-0.0004529953,-0.014953613,0.03555298,0.0066947937,0.008552551,0.010688782,-0.00655365,0.04714966,0.0047950745,-0.018066406,0.026275635,0.04220581,0.00945282,-0.030776978,-0.0014886856,-0.0038280487,-0.016983032,0.00141716,-0.045166016,0.019012451,0.05117798,-0.015808105,0.005191803,-0.0010795593,0.028320312,-0.008460999,0.009902954,-0.007926941,0.012710571,-0.010543823,0.036132812,-0.04135132,0.0134887695,0.010574341,0.007144928,-0.0069465637,-0.016098022,-0.028076172,0.020706177,0.012763977,-0.0046577454,0.042510986,0.00919342,0.031097412,-0.02355957,-0.020141602,0.0005812645,-0.022644043,-0.028366089,0.0184021,-0.007881165,0.0039367676,0.016860962,-0.017822266,0.025878906,-0.032348633,0.014129639,0.00856781,0.010604858,0.00083971024,-0.013542175,-0.009216309,-0.0066184998,-0.016204834,0.0073280334,0.0006480217,0.055633545,0.023086548,0.029525757,0.05001831,0.028503418,-0.0028438568,-0.03857422,-0.037994385,-0.0048713684,-0.017791748,0.015045166,-0.011886597,0.062561035,0.03074646,0.016204834,0.045074463,0.03353882,0.04284668,0.002910614,0.022705078,-0.02456665,-0.0018110275,-0.014419556,0.03253174,-0.007881165,0.028182983,-0.039398193,0.016998291,0.01184082,0.022003174,-0.021408081,0.029434204,0.062805176,0.021621704,-0.01234436,0.032806396,-0.008346558,-0.013412476,-0.010292053,-0.015808105,0.061401367,0.015388489,0.042907715,0.042663574,0.013694763,0.0034236908,0.020950317,-0.027420044,-0.017089844,0.054473877,0.025939941,-0.023086548,-0.022079468,0.00983429,0.0082473755,-0.058258057,-0.009963989,0.020217896,-0.0005335808,0.0011548996,-0.0001629591,-0.0076293945,-0.0132369995,-0.00028038025,0.018188477,0.009384155,-0.015586853,0.020706177,0.02748108,0.00031614304,0.034423828,0.00054979324,0.032104492,-0.03515625,-0.021697998,0.013870239,0.023544312,-0.007255554,-0.008132935,0.02822876,-0.004322052,0.03491211,0.0395813,-0.025802612,0.00028800964,0.02394104,0.008453369,0.004558563,0.0592041,0.038024902,0.0082092285,0.04119873,0.024505615,0.030517578,-0.04260254,0.016174316,-0.004497528,0.014907837,-0.015464783,-0.009590149,0.0044059753,-0.0070533752,0.015571594,0.0020866394,-0.012809753,0.016952515,0.034332275,-0.007320404,-0.0040512085,-0.013008118,0.0043640137,-0.030914307,-0.017349243,0.011054993,-0.019958496,0.03656006,0.015464783,0.028213501,-0.019424438,0.0158844,-0.009941101,-0.025619507,0.0024967194,0.02293396,-0.030929565,0.0052108765,-0.015991211,0.0039978027,-0.04724121,0.004043579,0.028579712,-0.021499634,0.019134521,0.011474609,0.0012454987,-0.010650635,0.035003662,0.009254456,-0.0022964478,-0.0057792664,-0.022399902,0.031097412,0.05239868,-0.0030059814,-0.00016272068,-0.02999878,-0.0025100708,0.003993988,-0.008216858,0.004180908,0.007659912,-0.01576233,-0.017822266,0.023376465,0.040039062,0.021881104,0.047607422,-0.023666382,-0.01109314,0.008995056,0.04119873,0.0074386597,-0.008964539,0.003232956,0.022994995,-0.025146484,0.029525757,0.03918457,0.008621216,0.03375244,0.0056915283,-0.013687134,0.0050811768,-0.025848389,0.022140503,-0.016952515,0.0009036064,-0.012321472,0.03387451,-0.0050849915,-0.03753662,0.0036411285,-0.009506226,-0.025909424,-0.01864624,0.01763916,0.000834465,0.028701782,0.038482666,0.019256592,-0.022094727,0.05557251,-0.012992859,0.045043945,0.0018434525,-0.00081062317,0.05404663,0.019454956,0.038024902,0.014549255,0.01121521,-0.03604126,0.017807007,0.03363037,0.022781372,0.012763977,0.007774353,-0.009712219,0.043304443,0.00045919418,0.03338623,-0.011177063,-0.010131836,0.017440796,-0.0013608932,-0.009597778,-0.0027885437,-0.007385254,0.014526367,0.054016113,-0.0340271,-0.005443573,-0.017990112,-0.007980347,0.026138306,-0.008583069,0.0071754456,0.007484436,-0.02645874,0.0029754639,-0.01374054,-0.023666382,0.0118637085,0.024414062,-0.044036865,-0.017044067,0.013015747,0.020111084,-0.030960083,0.033843994,0.021255493,-0.0027503967,0.012283325,0.043426514,-0.0063934326,0.01966858,-0.0126953125,0.027664185,0.03781128,0.0031337738,-0.008895874,0.003540039,0.014656067,-0.004055023,0.009307861,0.036010742,-0.012710571,-0.0035591125,-0.0046844482,0.0022525787,-0.0056991577,0.007247925,-0.0048675537,0.007007599,-0.005821228,-0.008277893,0.0030059814,0.0043144226,0.0016641617,0.00869751,-0.00945282,-0.013694763,0.006828308,0.027450562,0.029022217,-0.03439331,-0.00072956085,0.0005412102,0.012062073,-0.025817871,-0.010475159,0.0033397675,-0.040863037,0.016296387,0.011543274,0.011512756,0.015045166,-0.02720642,0.0031929016,0.030853271,0.014183044,0.011619568,0.00642395,-0.006046295,0.011497498,-0.0045204163,0.00084638596,0.00035333633,-0.0069084167,0.003238678,0.022354126,-0.0038280487,-0.030227661,0.013031006,0.000562191,0.017349243,-0.0071640015,-0.01058197,0.027389526,-0.0015468597,0.00079345703,-0.0016012192,-0.0005464554,-0.016845703,-0.0076828003,-0.011604309,0.043792725,0.059783936,-0.013473511,-0.011001587,0.02406311,0.024719238,0.023895264,0.028869629,0.0056610107,0.042022705,0.026260376,-0.021072388,-0.02293396,0.022659302,-0.0140686035,-0.021469116,0.01864624,-0.02319336,-0.01448822,0.006263733,0.009231567,-0.002609253,-0.03250122,-0.0060043335,-0.018569946,-0.014038086,0.020706177,0.00006425381,0.01461792,-0.02645874,-0.0076828003,0.0129776,-0.026107788,-0.050567627,-0.021408081,0.0015268326,-0.009025574,-0.05731201,0.004211426,-0.025421143,0.017456055,-0.022567749,-0.0018320084,-0.013748169,0.012245178,-0.02218628,-0.0073127747,-0.000020086765,0.029022217,0.015640259,0.0036792755,0.027786255,-0.034118652,-0.02268982,-0.025283813,0.004940033,-0.010940552,0.021438599,0.00074338913,0.04147339,0.01576233,-0.013320923,-0.0032844543,-0.013320923,-0.009101868,-0.008926392,-0.017074585,-0.025299072,0.033599854,0.013786316,0.0001450777,-0.007083893,0.0496521,-0.026184082,-0.014564514,0.018295288,0.04046631,0.020751953,0.019943237,-0.008377075,0.002609253,-0.016845703,0.006465912,-0.014198303,0.00982666,0.00084781647,0.0016584396,-0.0090408325,0.01675415,0.025146484,-0.014343262,-0.0048332214,0.037139893,0.013183594,-0.007522583,0.03933716,0.020462036,0.0011024475,-0.011787415,-0.006706238,0.012664795,0.046417236,0.005458832,0.01751709,-0.0085372925,0.0038471222,-0.0107803345,0.013320923,0.017242432,-0.02571106,-0.04083252,-0.015365601,-0.031982422,0.027374268,-0.0061836243,0.018798828,-0.012718201,0.026489258,-0.011627197,-0.032165527,-0.018173218,0.033050537,0.010543823,-0.010467529,-0.0050086975,0.014129639,0.0051956177,-0.037261963,0.0032520294,-0.047576904,-0.036743164,-0.020370483,-0.017944336,0.031097412,0.011367798,-0.01158905,0.0020332336,-0.0028495789,0.0005965233,0.0032978058,0.02545166,-0.009063721,-0.0046310425,0.028762817,0.0178833,-0.018753052,0.026107788,-0.012207031,-0.0023593903,0.010284424,-0.013839722,0.022338867,-0.0070533752,0.030639648,-0.007293701,0.002319336,0.028137207,-0.003545761,0.0047035217,-0.02784729,0.010528564,0.00042676926,-0.0038547516,0.03289795,-0.028076172,-0.02810669,0.0074043274,-0.016311646,-0.024734497,0.010559082,0.013130188,0.03857422,-0.007019043,0.047088623,-0.024658203,-0.0018253326,0.013343811,0.00806427,-0.01713562,0.015670776,0.035583496,-0.008026123,-0.0017871857,-0.00069856644,-0.011764526,-0.029907227,-0.004852295,0.010261536,-0.0016613007,-0.007621765,0.029067993,0.017044067,0.048858643,-0.005710602,0.010032654,0.018692017,0.0015888214,0.023910522,0.017242432,0.04748535,0.0033950806,-0.021820068,0.0057640076,-0.0033092499,-0.030883789,0.009666443,0.0028629303,0.002691269,-0.04425049,0.001912117,-0.007156372,0.027923584,-0.013168335,0.01576233,-0.017303467,0.0041236877,-0.02961731,0.0007147789,-0.035186768,0.015075684,0.02923584,0.0015459061,0.030075073,0.003622055,-0.026535034,0.021224976,0.052764893,-0.009941101,-0.030807495,-0.017074585,0.008453369,-0.005104065,0.007980347,0.0027103424,-0.023910522,-0.021942139,0.0033664703,-0.016433716,0.00036215782,-0.0022697449,0.017456055,0.0067825317,-0.0062561035,-0.0050354004,0.025543213,-0.0119018555,-0.0015563965,0.010551453,-0.0024375916,0.03048706,0.029052734,-0.016021729,0.02923584,0.009597778,-0.036956787,0.06213379,0.0060691833,0.031921387,-0.019622803,0.010635376,-0.03878784,-0.03543091,-0.01651001,-0.0017929077],"createdAt":"2026-04-18T18:37:07.732Z","updatedAt":"2026-04-23T16:06:39.705Z","lastSeenAt":"2026-04-23T16:06:39.705Z","tsv":"'/api':196 '/api/v1/invoices/48':110 '/call':13,28 '/docs':194 '/pricing':195 '/readme':198 '0.02':12,27,59,138,186 '000':128 '0x8335':133 '20':127 '402 payment API' '6':142 'Base network API' 'USDC micropayment API' 'accept':146 'access':116 'actual':229 'advertis':123,155 'ai/ml':49 'analysi':164 'analyt':48 'api':5,20,37,71,115 'application/json':119 'authent':85 'avail':224 'base':8,23,67,129,135 'behind':231 'beyond':236 'broad':42 'broader':153 'caller':86 'catalog':43 'categori':156,238 'challeng':122 'classif':167 'connect':204 'content':210 'convers':179 'cost':58 'crawl':227 'crypto-paid API' 'data':47,52,160 'decim':143 'discover':151 'document':189,219 'embed':168 'enabl':36 'endpoint':45,57,108,145,233 'equal':137 'estim':176 'everi':56 'exampl':223 'exchang':171 'export':161 'extrem':191 'feed':170 'finance/web3':51 'fulfil':101 'function':230 'gas':175 'generat':181 'geocod':177 'given':139 'handl':84 'header':92 'includ':87,157 'infer':50 'insight':162 'json-response' 'key':72 'label':239 'land':242 'limit':75 'list':112 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':125 'metric':158 'network':9,24,68 'no-api-key' 'offer':40 'openapi':214 'page':199,243 'paid':62 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':82,91,97 'per':3,18,60 'platform':6,21,38,154 'point':188 'post':147 'post-method' 'premium':114 'price':169,187 'prompt':206 'protocol':83 'quot':174 'rate':74,172 'render':201 'report':159 'request':4,19,61,103,148 'request/response':217 'requir':79 'return':118 'schema':218 'sentiment':163 'server':100 'servic':55 'sign':95 'span':46 'spars':192 'spec':215 'specif':107 'subscript':78 'summar':166 'text':165 'token':173 'unclear':235 'unit':130 'upon':104 'usag':222 'usdc':15,30,64,96,132,140 'usdc-base' 'util':54 'valid':178 'verif':105 'via':10,25 'wallet':205 'x':90 'x-payment':89 'x402':11,26,35,81,121 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6db3a71a-0e36-48c3-b6f9-7528fa47e719","listingId":"62e11378-24e2-4a57-b349-e31f1dceb069","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/invoices/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:07.732Z"}],"sources":[{"listingId":"62e11378-24e2-4a57-b349-e31f1dceb069","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:07.732Z","lastSeenAt":"2026-04-23T16:06:39.705Z"}],"details":{"listingId":"62e11378-24e2-4a57-b349-e31f1dceb069","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/48 \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 for /api/v1/invoices/48 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/48"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reports without subscription or API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching real-time crypto and finance data (prices, exchange rates, gas estimates) via micropayments","Using utility services (geocoding, validation, conversion) on a pay-as-you-go basis"],"bestFor":["Developers who want zero-friction API access without signup or API keys","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Developers without a Base-network USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.807Z"},"updatedAt":"2026-04-23T16:06:39.705Z"}}