{"id":"9b76d22a-eb7c-4930-8c4d-933b5c3c57f1","shortId":"zQHw6W","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/53` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 `X-PAYMENT` header with the \"exact\" scheme — no API keys, accounts, or rate limits are required.\n\nThe broader 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 endpoints are listed at the same $0.02 per request price point.\n\nNote that the specific functionality behind `/api/v1/cards/53` is not documented beyond the generic \"Premium API Access\" label. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical documentation, OpenAPI schema, or usage examples. Without further documentation it is unclear what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","json-response","post-method"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["The specific functionality of /api/v1/cards/53 ('Premium API Access') is not documented anywhere on the site.","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no technical content.","No OpenAPI spec, request schema, or response schema is available.","Cannot verify what data or service is actually returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/53","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/cards/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the specific purpose of /api/v1/cards/53 is entirely undocumented. 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":"2026-04-19T02:52:56.441Z","embedding":[-0.033233643,-0.033233643,0.03591919,0.016326904,0.016662598,-0.021881104,-0.041809082,0.01890564,0.0725708,-0.066467285,0.0357666,-0.060577393,-0.04498291,-0.019607544,-0.027420044,-0.00006455183,-0.01486969,0.000808239,-0.032806396,0.0473938,0.03643799,-0.019180298,-0.016052246,0.031921387,0.0018482208,-0.0047683716,0.007507324,0.0046157837,-0.0051956177,-0.04336548,0.040100098,-0.025497437,-0.0006670952,0.008796692,-0.022857666,-0.030899048,-0.008987427,0.028381348,0.03451538,-0.017242432,0.006542206,-0.047821045,0.012878418,-0.007865906,-0.046539307,-0.008575439,0.022659302,-0.038909912,-0.010887146,0.0031833649,-0.030426025,-0.017456055,-0.025970459,0.024993896,0.016220093,0.013710022,-0.013931274,-0.031066895,0.027786255,0.02168274,-0.0025100708,-0.0440979,-0.0007314682,0.0099105835,0.0030097961,0.042999268,-0.026062012,0.04324341,0.014373779,0.077697754,0.04244995,0.033111572,0.026260376,0.0039711,0.022155762,-0.014945984,-0.025405884,0.046569824,-0.01373291,-0.015640259,-0.017349243,0.009277344,-0.053955078,-0.016204834,-0.01725769,-0.07904053,0.006210327,0.015426636,-0.021408081,0.032287598,-0.097595215,-0.015129089,-0.0234375,-0.0055122375,-0.012794495,0.01335907,-0.02494812,0.0019760132,0.0043945312,0.0132369995,0.013557434,-0.04083252,0.025558472,0.016433716,0.048950195,0.021575928,-0.0002579689,0.03390503,-0.01234436,-0.01979065,-0.028381348,0.0071487427,-0.029006958,0.0031833649,0.012611389,0.016235352,-0.0084991455,0.028427124,-0.040863037,0.021484375,-0.0579834,0.042663574,0.02330017,-0.0066719055,0.0075531006,-0.038146973,-0.008911133,0.0040283203,-0.02658081,-0.01977539,0.028427124,0.006198883,0.0385437,-0.024429321,-0.025466919,0.006160736,-0.010902405,-0.023010254,-0.052978516,-0.02128601,0.044067383,-0.03152466,0.028167725,0.01625061,-0.08392334,0.0009217262,-0.04736328,0.010322571,-0.037994385,-0.0010147095,0.009124756,0.02696228,-0.013694763,-0.026153564,-0.012908936,-0.047088623,-0.004928589,0.036895752,-0.007511139,0.03479004,-0.013999939,0.012382507,0.008163452,-0.00013875961,0.004722595,0.025772095,-0.0158844,-0.08465576,-0.083740234,-0.028961182,-0.015556335,-0.013931274,-0.04031372,-0.0121154785,-0.020477295,-0.07537842,-0.035980225,-0.02444458,-0.007045746,-0.03274536,-0.018600464,-0.032958984,0.0010986328,-0.015991211,-0.051635742,0.002708435,-0.040618896,0.0413208,0.0234375,0.01878357,0.021148682,0.0011453629,0.057281494,0.027526855,-0.0018100739,-0.016586304,0.018630981,-0.025680542,0.043121338,0.012268066,0.0121154785,-0.03390503,0.032348633,0.07293701,0.009124756,-0.035736084,-0.0016050339,-0.04458618,-0.03250122,-0.018569946,0.0046424866,-0.0069122314,-0.02734375,0.024276733,-0.034606934,-0.02911377,0.011642456,0.012939453,0.0211792,0.07714844,0.010261536,0.017028809,0.017684937,0.014083862,-0.052764893,0.040222168,0.02960205,0.016113281,-0.02330017,-0.026016235,0.021713257,0.06021118,-0.020584106,0.003446579,-0.020492554,0.024108887,-0.006137848,-0.006210327,0.025756836,-0.018127441,-0.024154663,-0.03842163,-0.017196655,0.024124146,0.0016241074,-0.040985107,-0.042175293,-0.076049805,0.045715332,0.04660034,0.042541504,-0.005558014,-0.012290955,-0.016921997,-0.0059127808,-0.060638428,0.029647827,0.07763672,-0.002313614,-0.01838684,0.029312134,0.005706787,-0.030578613,-0.013961792,-0.006046295,-0.02381897,-0.030044556,0.0231781,-0.045654297,0.006072998,0.031204224,0.029678345,0.041381836,-0.013999939,-0.03186035,-0.022628784,-0.016357422,0.000071406364,-0.029174805,0.006378174,0.007873535,0.011077881,0.04623413,0.012283325,0.018753052,-0.0107040405,0.025863647,-0.0058174133,-0.0024471283,-0.026351929,-0.03668213,0.024520874,0.00409317,-0.069885254,0.009017944,-0.0096588135,0.064575195,-0.046966553,0.043640137,-0.022369385,0.022079468,0.033111572,-0.027709961,-0.03375244,0.0034809113,0.020263672,0.045532227,0.032836914,-0.0025691986,-0.010925293,-0.020324707,0.047973633,-0.01158905,-0.009124756,-0.0072021484,0.034240723,0.024246216,0.00020873547,-0.043395996,-0.041168213,-0.0044670105,-0.0152282715,0.03564453,-0.04135132,0.035217285,-0.010864258,0.0041122437,-0.023391724,-0.0020179749,-0.046142578,0.022399902,-0.007411957,0.00037527084,-0.0155181885,-0.03314209,0.010574341,0.003944397,-0.016464233,-0.01360321,0.02696228,0.030929565,-0.02281189,-0.041931152,-0.0029449463,-0.022064209,-0.013618469,0.0184021,0.0128479,0.034484863,0.022033691,-0.0390625,0.0025672913,0.017089844,0.0006351471,0.010887146,-0.0064315796,0.0033168793,-0.052612305,-0.05114746,-0.018920898,-0.017440796,0.017059326,0.010047913,0.0098724365,0.055267334,0.0076408386,-0.023971558,-0.02859497,0.014228821,-0.048950195,-0.0027580261,0.03652954,-0.020355225,-0.042114258,0.012283325,-0.007221222,0.0045700073,0.053009033,0.013397217,-0.00045490265,0.06317139,0.026367188,0.0209198,0.02142334,0.023803711,0.035736084,0.00009661913,-0.008270264,-0.03479004,-0.010444641,0.021499634,-0.038513184,-0.035095215,-0.07397461,0.045043945,0.044036865,0.07952881,0.020874023,0.0035095215,0.023391724,-0.025314331,0.021942139,-0.024658203,-0.024475098,-0.032104492,-0.023422241,0.03201294,-0.007499695,-0.013656616,-0.026550293,0.031204224,0.008773804,0.017578125,-0.014961243,0.052337646,-0.014587402,-0.014450073,0.0041275024,0.008918762,0.040008545,0.0637207,-0.06262207,0.028076172,0.025466919,-0.012786865,-0.003189087,0.039093018,-0.0063285828,-0.024856567,-0.06463623,-0.035217285,-0.009506226,0.0045433044,-0.06604004,0.024368286,0.00087833405,0.03994751,0.005455017,-0.01058197,-0.00969696,-0.0069732666,-0.013618469,-0.047912598,-0.0029754639,-0.041137695,-0.0072517395,0.037384033,-0.025909424,-0.0014438629,-0.014732361,-0.00919342,0.006526947,0.0043563843,0.022354126,0.0021476746,-0.055114746,0.037963867,0.013366699,0.004283905,0.01751709,0.040252686,0.019256592,0.008224487,0.0552063,0.015701294,-0.013053894,-0.042388916,0.030960083,-0.042266846,-0.021087646,-0.0015907288,-0.013053894,0.010185242,-0.017837524,-0.016143799,-0.022460938,0.009559631,-0.018692017,0.017364502,0.038635254,-0.035064697,-0.03930664,-0.06951904,-0.019134521,0.0076522827,0.08557129,0.0060920715,-0.0018587112,-0.055847168,-0.007865906,0.02015686,0.00856781,0.030258179,-0.015533447,-0.016677856,-0.000521183,-0.033569336,-0.019439697,-0.023361206,0.040740967,-0.0076065063,-0.0045700073,0.015640259,0.009254456,0.011169434,-0.010467529,-0.0008468628,0.015182495,-0.018951416,-0.0052490234,-0.024169922,0.026062012,0.013153076,-0.004020691,-0.040924072,0.052490234,0.007160187,0.04196167,-0.046173096,-0.009140015,-0.011390686,0.013710022,0.026626587,-0.0079956055,-0.005947113,0.008865356,-0.03933716,-0.06616211,0.020309448,-0.021774292,0.013175964,0.0042304993,0.006401062,0.042022705,-0.011039734,0.008773804,0.02067566,-0.036468506,-0.020126343,-0.038330078,-0.024002075,-0.021575928,0.003540039,-0.031677246,0.020370483,-0.009918213,0.005908966,-0.014785767,-0.022018433,0.03778076,0.016937256,-0.007835388,0.027130127,0.001578331,0.017227173,0.036987305,0.00844574,-0.040924072,0.008255005,-0.0009531975,0.008872986,-0.007686615,0.038085938,0.03845215,-0.029968262,-0.0035877228,-0.0017871857,-0.012504578,-0.01576233,-0.023712158,0.009346008,0.01890564,0.00541687,-0.010673523,0.009864807,0.011047363,-0.019256592,-0.022003174,0.01737976,0.029922485,-0.039215088,0.019989014,0.028717041,0.052825928,-0.03302002,0.014190674,0.005115509,0.03152466,0.026290894,-0.01108551,-0.012382507,0.01939392,-0.033203125,0.008621216,0.00037670135,-0.00856781,0.015449524,0.019363403,0.024261475,0.03552246,0.01651001,-0.033966064,-0.03466797,0.009468079,-0.008293152,-0.018066406,0.030715942,0.028640747,0.018585205,-0.014373779,0.03277588,0.027786255,-0.025390625,-0.010009766,-0.019088745,0.04043579,-0.014137268,-0.01727295,0.027236938,-0.0069618225,0.01838684,-0.061706543,-0.002286911,-0.0009264946,0.0050315857,-0.012588501,-0.054473877,-0.040100098,-0.0016870499,0.017410278,0.011428833,0.021270752,0.021972656,0.0018568039,0.0018119812,0.027679443,0.00028562546,-0.0024337769,0.002998352,-0.055145264,-0.026977539,-0.012458801,-0.0067481995,-0.015533447,0.01828003,-0.016921997,-0.028396606,0.0033493042,-0.014160156,0.008598328,-0.0129470825,0.0077781677,0.0309906,-0.008857727,0.02255249,-0.012840271,-0.020141602,0.008270264,0.0024795532,0.026412964,-0.030532837,0.02178955,-0.014785767,-0.0067443848,0.004886627,0.03250122,0.027862549,0.037261963,-0.003665924,0.029846191,-0.03781128,0.0345459,-0.04095459,0.013923645,0.0006046295,-0.024246216,-0.020645142,-0.017684937,-0.015655518,0.03753662,-0.023468018,0.005683899,-0.022216797,-0.03111267,-0.0069274902,-0.05706787,0.015213013,0.028320312,0.041809082,-0.046173096,0.012863159,0.023834229,0.0141067505,-0.019058228,-0.010955811,-0.0021953583,0.017028809,0.021240234,-0.002462387,-0.034698486,-0.012008667,0.011543274,0.008262634,-0.054779053,-0.044952393,-0.016815186,0.013710022,0.00982666,-0.023330688,-0.019607544,-0.024963379,-0.0047798157,-0.029846191,0.020492554,0.0024814606,0.029708862,0.01071167,-0.027420044,0.009460449,0.030258179,-0.030136108,0.04360962,-0.009010315,-0.016601562,-0.049926758,0.008522034,0.00932312,0.019943237,0.003534317,-0.041900635,-0.00026202202,-0.02494812,-0.058563232,-0.002910614,-0.007904053,0.0079956055,0.00046491623,-0.021118164,-0.06317139,-0.0069618225,-0.013641357,0.012313843,0.0206604,0.010299683,-0.0006341934,-0.0019836426,0.004673004,-0.019866943,-0.023269653,-0.023803711,0.018875122,0.011001587,0.008918762,0.015899658,0.032470703,0.0001103282,-0.02507019,0.0045776367,0.003440857,0.024917603,-0.021942139,0.007598877,-0.00970459,0.015945435,0.0019893646,-0.013656616,-0.02973938,-0.0014705658,0.071777344,0.00806427,0.0052719116,-0.000664711,-0.011741638,0.011810303,0.046051025,-0.037719727,0.0012464523,-0.026367188,0.02911377,-0.008728027,0.012504578,0.006706238,0.025680542,-0.019424438,-0.05166626,0.0002168417,0.01776123,-0.0001167655,-0.05871582,-0.028182983,-0.059295654,0.0025119781,-0.021575928,-0.027389526,-0.0022296906,0.0015707016,-0.009513855,-0.0680542,0.0045166016,0.05340576,0.00806427,0.025634766,-0.003238678,0.033843994,0.03213501,-0.024734497,-0.017486572,0.01398468,-0.020721436,-0.014640808,-0.025497437,0.03692627,-0.013336182,-0.026931763,0.020980835,0.023849487,0.026290894,0.0016212463,0.00762558,-0.016036987,0.012771606,-0.0059547424,0.026062012,0.001077652,-0.004886627,0.041748047,-0.04043579,0.032470703,0.0050697327,-0.014389038,-0.0005135536,0.019882202,0.04928589,-0.02973938,-0.012619019,0.028778076,0.014663696,0.038970947,-0.02053833,0.046875,0.016235352,-0.004550934,0.004917145,-0.0071792603,-0.019439697,-0.036590576,-0.029037476,0.036987305,0.004207611,0.019317627,-0.014823914,-0.00217247,0.0132751465,-0.003780365,0.010238647,-0.016830444,-0.0076065063,-0.021026611,0.022216797,0.009819031,-0.005783081,0.011505127,0.024856567,0.016952515,0.03704834,-0.006336212,-0.013977051,0.013427734,0.034729004,-0.0049095154,0.00051259995,0.012290955,0.0135269165,0.015304565,0.031143188,0.02420044,-0.037597656,-0.019180298,-0.021530151,-0.014533997,-0.010391235,-0.0039253235,-0.004383087,-0.004497528,0.016464233,-0.004211426,-0.039733887,-0.009811401,-0.02911377,-0.037719727,0.0016794205,-0.026626587,0.026550293,0.019638062,0.01449585,0.019897461,-0.0036067963,0.05105591,-0.00969696,0.0071487427,0.033569336,0.02319336,0.015853882,-0.03366089,-0.015235901,-0.011749268,-0.009506226,0.012779236,-0.021575928,0.0007748604,0.04107666,-0.014785767,0.000055730343,0.0014591217,0.024475098,0.0085372925,0.004814148,-0.0075912476,0.008766174,-0.014839172,0.03353882,-0.050811768,0.018295288,0.02003479,0.021087646,0.010467529,-0.014091492,-0.020736694,0.020111084,0.0054244995,-0.013221741,0.053527832,-0.0056991577,0.029251099,-0.020050049,-0.032165527,0.005886078,-0.015090942,-0.024261475,0.025726318,-0.0017051697,-0.0011320114,0.00020468235,-0.04031372,0.03955078,-0.031280518,0.0064697266,0.007980347,0.0103302,-0.008918762,-0.019165039,-0.0005245209,-0.005908966,-0.014404297,-0.0079574585,-0.0021762848,0.051757812,0.023330688,0.025680542,0.028182983,0.013473511,0.0069007874,-0.026489258,-0.017471313,0.003704071,-0.019882202,0.022079468,-0.03060913,0.04788208,0.043762207,0.0138549805,0.042022705,0.03604126,0.027313232,-0.005718231,0.011520386,-0.023040771,0.027557373,-0.028182983,0.012741089,0.003036499,0.03817749,-0.03314209,0.01751709,-0.008804321,0.0129470825,-0.033172607,0.02494812,0.06762695,0.023605347,-0.0050468445,0.025939941,-0.015144348,-0.004058838,-0.01838684,-0.008049011,0.068603516,0.0069122314,0.040130615,0.04232788,0.017578125,0.0039482117,0.013328552,-0.02166748,-0.028930664,0.052215576,0.031555176,-0.033691406,-0.0058517456,-0.006439209,0.0051994324,-0.051116943,-0.014625549,0.015586853,0.005924225,0.012199402,-0.014656067,-0.011276245,-0.013961792,0.007873535,0.003944397,0.0065078735,-0.007881165,0.016723633,0.022750854,-0.0040512085,0.023040771,-0.0034275055,0.028671265,-0.021987915,-0.028137207,0.009765625,0.018493652,-0.0063552856,0.01260376,0.02986145,0.008926392,0.036224365,0.036132812,-0.019821167,-0.002105713,0.03010559,0.0076179504,0.0011081696,0.04611206,0.033569336,0.011909485,0.045806885,0.04360962,0.028030396,-0.029632568,0.015533447,-0.011894226,0.0013742447,-0.013336182,-0.010101318,0.007419586,0.00010639429,0.015144348,0.01637268,-0.016342163,0.025299072,0.017944336,0.00043845177,0.0012140274,-0.0013408661,0.025054932,-0.006099701,0.011489868,0.0036792755,-0.0082092285,0.036376953,0.014160156,0.030532837,-0.024017334,0.02293396,0.0104904175,-0.027862549,-0.01537323,0.011421204,-0.026672363,0.0107803345,-0.018371582,-0.0109939575,-0.04928589,0.014228821,0.019470215,-0.0072021484,0.0259552,0.005443573,-0.014923096,-0.00806427,0.02861023,0.014854431,-0.008201599,-0.015609741,-0.024124146,0.04321289,0.048461914,0.008010864,-0.00013244152,-0.017745972,0.002916336,0.022033691,-0.0016412735,0.011177063,0.0049591064,0.0048828125,-0.034820557,0.017211914,0.0236969,0.024810791,0.044403076,-0.02217102,-0.008308411,-0.007572174,0.029312134,0.013008118,0.0028324127,-0.006549835,0.025558472,-0.0052986145,0.043426514,0.037200928,0.0046195984,0.018371582,-0.013465881,-0.0052948,0.007572174,-0.01146698,0.020050049,-0.023086548,0.010917664,-0.008918762,0.025527954,-0.017791748,-0.041290283,0.008369446,-0.008666992,-0.018341064,-0.027862549,0.0135650635,-0.008026123,0.01902771,0.034942627,0.022872925,-0.023986816,0.066711426,-0.019851685,0.043945312,-0.011810303,-0.017974854,0.05734253,0.032684326,0.037017822,0.0056915283,0.014762878,-0.018722534,0.0119018555,0.04840088,0.011161804,0.0015096664,0.009254456,-0.0141067505,0.04360962,-0.003080368,0.033233643,-0.005378723,-0.011734009,0.006652832,-0.011009216,-0.0064964294,-0.00844574,0.00006431341,0.028808594,0.053741455,-0.028808594,-0.009727478,-0.025238037,-0.011024475,0.027389526,-0.013824463,0.0063819885,-0.0034828186,-0.019226074,0.020492554,-0.033203125,-0.01889038,0.010482788,0.027572632,-0.048736572,-0.020935059,-0.0023345947,0.027648926,-0.03579712,0.022705078,0.02557373,-0.000004708767,0.021087646,0.035888672,-0.0033130646,0.03829956,-0.0018482208,0.035095215,0.040222168,-0.00655365,-0.009162903,-0.0037631989,0.01008606,-0.009277344,0.008270264,0.030883789,-0.006576538,0.010063171,-0.0024604797,0.0017604828,-0.009559631,0.024154663,-0.008651733,-0.00027251244,-0.0012683868,-0.008979797,0.00440979,0.003835678,-0.0012607574,-0.0006170273,0.00983429,-0.013641357,0.002746582,0.038848877,0.02079773,-0.047821045,-0.00459671,0.020568848,0.011634827,-0.009819031,-0.01701355,-0.017868042,-0.03366089,0.0045928955,0.016174316,0.02293396,0.008804321,-0.030563354,-0.00041103363,0.021942139,0.012481689,0.027053833,0.0041618347,-0.019866943,0.0061073303,-0.006717682,0.006954193,-0.01121521,-0.008384705,0.01979065,0.030471802,-0.0055618286,-0.030929565,0.029327393,-0.0017023087,0.0012340546,0.0016260147,-0.0071525574,0.016342163,-0.012542725,-0.018249512,0.008125305,0.008369446,-0.0023593903,-0.021759033,-0.029037476,0.030715942,0.06137085,-0.016555786,0.0025577545,0.013389587,0.016296387,0.031463623,0.03692627,0.01890564,0.028930664,0.016708374,-0.002702713,-0.025558472,0.028076172,-0.015022278,-0.024459839,0.017288208,-0.009712219,-0.033447266,0.024108887,-0.0026226044,0.0014019012,-0.016433716,-0.028808594,-0.014984131,-0.016189575,0.021728516,-0.010177612,0.006729126,-0.036346436,-0.0154953,0.011917114,-0.012054443,-0.036193848,-0.019805908,-0.005836487,-0.015159607,-0.06726074,0.006839752,-0.022476196,0.002632141,-0.020523071,0.008270264,0.012107849,0.040924072,-0.0065994263,0.0035266876,-0.0020751953,0.040100098,0.009811401,0.016098022,0.0138168335,-0.017150879,-0.016464233,-0.007843018,-0.004096985,0.0024433136,0.02331543,-0.019317627,0.042755127,0.025756836,-0.027648926,-0.0035629272,-0.0036506653,-0.0045433044,-0.0037231445,-0.03366089,-0.02041626,0.00737381,0.020431519,-0.01525116,0.0018701553,0.04269409,-0.019302368,-0.019256592,0.027740479,0.032470703,0.004261017,0.038146973,-0.013496399,-0.018798828,-0.016799927,0.00340271,-0.0073928833,0.005378723,0.012794495,0.008018494,0.008560181,0.010276794,0.022033691,-0.013420105,-0.0014162064,0.014732361,0.0259552,-0.012275696,0.039886475,0.018066406,-0.013572693,-0.013908386,-0.018737793,0.03692627,0.060791016,0.012062073,0.009376526,-0.004814148,-0.002796173,-0.007221222,-0.0020656586,0.017059326,-0.01878357,-0.044891357,-0.017028809,-0.0134887695,0.023895264,-0.011451721,0.0048942566,-0.0060195923,0.015304565,-0.009597778,-0.035461426,-0.009056091,0.029037476,0.0012655258,-0.017120361,-0.009262085,0.008522034,0.026138306,-0.029922485,0.0056915283,-0.0552063,-0.028060913,-0.020370483,-0.012893677,0.020767212,-0.00093889236,0.0044288635,-0.0013504028,-0.00090265274,-0.0014095306,0.0017166138,0.015129089,-0.01499939,0.0008354187,0.014282227,0.016098022,-0.00699234,0.01838684,0.0021076202,-0.0014829636,0.005935669,-0.012191772,0.017028809,-0.024429321,0.034179688,0.009552002,-0.0016298294,0.029678345,0.002506256,0.02255249,-0.0067596436,-0.006664276,-0.0016708374,-0.00047039986,0.03881836,-0.023117065,-0.022949219,0.008934021,-0.014251709,-0.04119873,0.0071754456,0.026138306,0.02218628,-0.026107788,0.052246094,-0.0024681091,-0.0010061264,0.022064209,0.010482788,-0.0104904175,-0.00048327446,0.02078247,-0.0033683777,0.0032920837,-0.00945282,-0.013710022,-0.028823853,-0.021621704,0.007926941,-0.0064201355,-0.019744873,0.025924683,0.016464233,0.042388916,-0.0038890839,0.030258179,0.028274536,-0.001408577,0.031951904,0.0074539185,0.04827881,0.0040779114,-0.03302002,0.001493454,0.000020861626,-0.012382507,0.0001295805,-0.0063667297,0.004306793,-0.027786255,0.004173279,0.020828247,0.023117065,-0.020462036,0.013580322,-0.022598267,-0.0044898987,-0.023284912,-0.0042152405,-0.02810669,0.009735107,0.042114258,0.013893127,0.014640808,-0.0178833,-0.019622803,0.02999878,0.050201416,0.006401062,-0.03289795,-0.005508423,0.0044555664,-0.0029449463,-0.0051345825,0.0053253174,-0.039978027,-0.015701294,-0.008148193,-0.012649536,0.002796173,-0.009460449,0.032684326,-0.0022697449,-0.013572693,-0.00028896332,0.021713257,-0.016540527,0.0033569336,0.0057373047,0.0006685257,0.032806396,0.03652954,-0.020233154,0.02835083,0.02909851,-0.032592773,0.052978516,-0.003692627,0.009590149,-0.004676819,0.016174316,-0.043304443,-0.004131317,-0.001578331,0.019805908],"createdAt":"2026-04-18T18:43:38.224Z","updatedAt":"2026-04-22T10:31:28.864Z","lastSeenAt":"2026-04-22T10:31:28.864Z","tsv":"'/api/v1/cards/53':64,169 '/request':17,34 '0.02':16,33,75,158 '000':79 '20':78 '402 payment API' '6':85 'Base USDC API' 'access':70,178 'account':104 'addit':195 'advertis':113 'ai':10,27,125 'analysi':129 'analyt':119 'api':4,21,40,69,102,117,177 'base':7,24,58,80 'behind':48,168 'beyond':173 'broader':111 'call':77 'categori':115 'classif':132 'connect':190 'convers':149 'cost':72 'data':9,26,118,122,210 'decim':86 'doc':181 'document':172,197,205 'embed':133 'endpoint':14,31,47,62,152,215 'estim':143 'exact':99 'exampl':202 'exchang':138 'export':123 'feed':137 'financ':11,28,134 'four':114 'function':167 'gas':142 'gate':3,20,43 'generat':150 'generic':175 'geocod':147 'handl':89 'header':96 'infrastructur':145 'insight':124 'json-response' 'key':103 'label':179 'learn':127 'limit':107 'list':66,154 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'marketplac':41 'metric':120 'micropay':52 'network':59 'no-api-key' 'note':163 'offer':8,25 'openapi':198 'page':185 'particular':214 'pay-per-request API' 'payment':87,95 'per':50,76,159 'per-request':49 'per-request-micropayment' 'platform':5,22,112 'point':162 'post-method' 'premium':68,176 'price':136,161,182 'prompt':192 'protocol':39 'quot':141 'rate':106,139 'readm':184 'render':187 'report':121 'request':51,160 'requir':109 'return':216 'schema':199 'scheme':100 'sentiment':128 'servic':212 'settl':53 'specif':61,166 'summar':131 'technic':196 'text':130 'token':140 'unclear':208 'unit':81 'usag':201 'usdc':55,83 'usdc-base' 'util':13,30,146 'valid':148 'varieti':45 'via':90 'wallet':191 'web3':135 'without':203 'x':94 'x-payment':93 'x402':2,19,38,92 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"77573c04-63b2-4f3b-b385-849d0c6a4309","listingId":"9b76d22a-eb7c-4930-8c4d-933b5c3c57f1","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/cards/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:38.224Z"}],"sources":[{"listingId":"9b76d22a-eb7c-4930-8c4d-933b5c3c57f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:38.224Z","lastSeenAt":"2026-04-22T10:31:28.864Z"}],"details":{"listingId":"9b76d22a-eb7c-4930-8c4d-933b5c3c57f1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/53 \\\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 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/53"},{"claim":"All 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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/53"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 protocol","Integrating pay-per-use endpoints into workflows settled on Base L2"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 micropayments autonomously","Projects already operating on the Base network with USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk/subscription pricing below $0.02 per call","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.731Z"},"updatedAt":"2026-04-22T10:31:28.864Z"}}