{"id":"7c0eb9da-b980-4f1b-b19e-6828e92c70f2","shortId":"Tazyyy","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/71` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The x402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals).\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/request price point. The platform claims no API keys, no rate limits, and instant access — payment is the only authentication mechanism.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality behind `/api/v1/cards/71` (labeled \"Premium API Access\") is unclear — it does not correspond to any of the named endpoints on the landing page, and no schema or description beyond the title is available.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-api","json-response"],"categories":["api-marketplace","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","The endpoint path /api/v1/cards/71 does not match any of the named endpoints on the landing page; its actual functionality is unknown.","No OpenAPI schema or request/response examples are provided anywhere.","No robots.txt or agents.txt found; no AI plugin manifest available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/71","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/cards/71 is unexplained. The docs, pricing, and README pages are all empty. 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":"2026-04-19T03:01:58.080Z","embedding":[-0.03970337,-0.038848877,0.032165527,0.013511658,0.019256592,-0.02671814,-0.042633057,0.031982422,0.076171875,-0.0501709,0.04019165,-0.07287598,-0.04321289,-0.01965332,-0.031585693,0.0055122375,-0.0134887695,-0.001739502,-0.042053223,0.041503906,0.04397583,-0.016403198,-0.015022278,0.031829834,0.0023822784,0.0034217834,0.010803223,0.0044288635,-0.005268097,-0.032684326,0.03439331,-0.0234375,-0.008239746,0.01600647,-0.0073051453,-0.019348145,0.0026168823,0.031188965,0.038208008,-0.012901306,-0.00028538704,-0.05014038,0.017410278,-0.014587402,-0.051330566,-0.005340576,0.027694702,-0.037719727,-0.019119263,-0.0010957718,-0.034729004,-0.010475159,-0.015609741,0.025497437,0.013687134,0.00047802925,-0.016052246,-0.024658203,0.013069153,0.024658203,-0.0057907104,-0.05026245,-0.0019702911,0.0078048706,0.0006160736,0.038208008,-0.019332886,0.038604736,0.010406494,0.07611084,0.031585693,0.03111267,0.0335083,0.0059928894,0.014190674,-0.01586914,-0.026275635,0.06021118,-0.016708374,-0.012779236,-0.019546509,-0.0020771027,-0.059173584,-0.028564453,-0.02456665,-0.07312012,0.0008382797,0.011917114,-0.026641846,0.026367188,-0.082214355,-0.010284424,-0.030151367,-0.002828598,-0.016220093,-0.0009088516,-0.024368286,0.008857727,0.0070724487,0.018981934,0.010826111,-0.053344727,0.020736694,0.012741089,0.05303955,0.027816772,0.008644104,0.030380249,0.0010585785,-0.01739502,-0.027023315,-0.00089788437,-0.033416748,-0.0035305023,0.017684937,0.009216309,-0.018875122,0.020370483,-0.035980225,0.021942139,-0.05633545,0.04626465,0.026992798,-0.011932373,0.007007599,-0.04269409,0.00046515465,0.006149292,-0.043914795,-0.010261536,0.031951904,0.00919342,0.033813477,-0.020629883,-0.033599854,0.0032958984,-0.014862061,-0.030395508,-0.04611206,-0.016296387,0.028930664,-0.023406982,0.026016235,0.01625061,-0.095581055,-0.003211975,-0.036346436,0.010025024,-0.03579712,-0.0018367767,0.012718201,0.02659607,-0.015823364,-0.031799316,-0.0126953125,-0.048339844,-0.014831543,0.041381836,-0.010063171,0.03616333,-0.008201599,0.014930725,0.009361267,-0.0039520264,0.009048462,0.028289795,-0.0146102905,-0.092163086,-0.08300781,-0.03189087,-0.019165039,-0.014640808,-0.035064697,-0.014541626,-0.02079773,-0.0703125,-0.031143188,-0.023925781,-0.004047394,-0.046875,-0.015556335,-0.030075073,0.009681702,-0.014793396,-0.051086426,-0.0104522705,-0.0340271,0.043670654,0.019104004,0.016952515,0.02192688,0.006893158,0.07269287,0.023712158,-0.0035686493,-0.032196045,0.018463135,-0.019134521,0.04660034,0.017150879,0.01146698,-0.032806396,0.03527832,0.06335449,0.007835388,-0.02507019,0.0033740997,-0.040008545,-0.033721924,-0.014122009,0.0096206665,-0.0019102097,-0.020645142,0.023483276,-0.029281616,-0.03878784,0.0017547607,0.009880066,0.022964478,0.070617676,0.0038967133,0.018478394,0.010124207,0.015106201,-0.04260254,0.0501709,0.03048706,0.017288208,-0.010017395,-0.02973938,0.02658081,0.062561035,-0.028427124,-0.0064430237,-0.017181396,0.024597168,0.0116119385,-0.0027065277,0.027740479,-0.012771606,-0.018356323,-0.039733887,-0.016693115,0.022354126,0.004310608,-0.04434204,-0.044708252,-0.0690918,0.0413208,0.03665161,0.040863037,-0.00043177605,-0.0013122559,-0.010795593,-0.002790451,-0.06008911,0.03677368,0.07952881,-0.0071372986,-0.02053833,0.03201294,0.006416321,-0.026168823,-0.011444092,-0.011924744,-0.016937256,-0.038482666,0.018112183,-0.040649414,0.0028743744,0.024597168,0.04083252,0.04046631,-0.017089844,-0.038757324,-0.03503418,-0.0056266785,-0.0000782609,-0.029937744,0.0053749084,0.016464233,0.025100708,0.03643799,0.0129470825,0.032714844,-0.0066833496,0.023956299,-0.012512207,0.0066719055,-0.026626587,-0.03652954,0.017120361,0.0009870529,-0.06188965,0.0076408386,-0.0062026978,0.06585693,-0.047729492,0.038360596,-0.019714355,0.028213501,0.03024292,-0.024978638,-0.03643799,-0.0010576248,0.023757935,0.04425049,0.040618896,-0.00026774406,-0.005466461,-0.016342163,0.044952393,-0.00907135,-0.0005354881,-0.0003888607,0.028289795,0.016693115,0.0051879883,-0.031585693,-0.047058105,-0.012756348,-0.027633667,0.032440186,-0.029220581,0.036895752,-0.019744873,-0.0025558472,-0.023788452,0.0002002716,-0.04977417,0.024093628,-0.023040771,0.0047187805,-0.019729614,-0.03540039,0.004032135,0.012367249,-0.0038032532,-0.0036678314,0.032928467,0.02973938,-0.013763428,-0.03253174,-0.00207901,-0.029830933,-0.011924744,0.021408081,0.008895874,0.028930664,0.029663086,-0.04284668,0.002544403,0.022521973,0.008399963,0.019088745,-0.0071411133,-0.0025196075,-0.048980713,-0.04458618,-0.022918701,-0.024383545,0.012634277,-0.000091552734,0.004711151,0.05328369,0.007320404,-0.01335907,-0.043121338,0.014160156,-0.04852295,-0.008255005,0.032592773,-0.020431519,-0.047607422,0.010429382,-0.00012242794,0.0023269653,0.042785645,0.013923645,0.0034999847,0.066833496,0.018478394,0.019577026,0.023620605,0.019363403,0.03137207,0.007751465,-0.01448822,-0.038208008,-0.0138168335,0.02658081,-0.026016235,-0.024475098,-0.074645996,0.05230713,0.035583496,0.07208252,0.016479492,0.0077171326,0.027420044,-0.025802612,0.018936157,-0.023422241,-0.010063171,-0.030532837,-0.03451538,0.03793335,-0.0057296753,-0.020812988,-0.033935547,0.029083252,-0.0052223206,0.01348114,-0.02128601,0.05493164,-0.019744873,-0.011779785,-0.00042152405,0.005924225,0.051940918,0.055603027,-0.061401367,0.014282227,0.02406311,-0.01197052,0.005126953,0.04650879,-0.016555786,-0.0155181885,-0.060302734,-0.034942627,-0.016571045,-0.0076675415,-0.055664062,0.02003479,0.010368347,0.031921387,0.0104522705,-0.013061523,-0.012550354,0.010665894,-0.017532349,-0.054016113,-0.0019254684,-0.049468994,0.002210617,0.042755127,-0.03164673,0.009490967,-0.0077171326,-0.011016846,-0.0040359497,0.010414124,0.012451172,0.007797241,-0.052368164,0.03955078,0.013023376,-0.0027866364,0.025115967,0.039398193,0.03427124,0.0024414062,0.052825928,0.016952515,-0.01940918,-0.047698975,0.03387451,-0.033569336,-0.0152282715,-0.0044021606,-0.018341064,0.009819031,-0.017028809,-0.024459839,-0.023712158,0.0138549805,-0.010803223,0.013031006,0.044006348,-0.048858643,-0.037872314,-0.06744385,-0.020812988,0.009376526,0.087402344,0.011924744,-0.0044059753,-0.057800293,-0.0065841675,0.007633209,0.0044441223,0.030563354,-0.016281128,-0.025543213,-0.011856079,-0.03010559,-0.024612427,-0.026184082,0.04058838,-0.0034732819,-0.012908936,0.010673523,0.014518738,0.011047363,-0.0076408386,-0.00078344345,0.022399902,-0.012634277,-0.0068626404,-0.036102295,0.021148682,0.0038032532,-0.0056610107,-0.04071045,0.061676025,0.0070343018,0.050079346,-0.042266846,-0.004901886,-0.008651733,0.017211914,0.02355957,-0.011787415,-0.0036563873,0.011291504,-0.04336548,-0.06976318,0.02520752,-0.022827148,0.010131836,0.0057525635,0.013885498,0.042114258,-0.015350342,0.0116119385,0.014312744,-0.038024902,-0.014328003,-0.032989502,-0.024963379,-0.019439697,0.0044822693,-0.028762817,0.017471313,-0.014144897,0.0051116943,-0.013633728,-0.019561768,0.04095459,0.021514893,-0.0014619827,0.023513794,0.00598526,0.016479492,0.038604736,0.013893127,-0.044830322,0.016693115,0.0030651093,0.003786087,0.0004105568,0.03933716,0.03378296,-0.022384644,-0.0039253235,-0.0036773682,-0.012306213,-0.01033783,-0.022262573,0.020950317,0.023330688,0.0075950623,-0.015594482,0.019927979,0.008216858,-0.025009155,-0.023223877,0.020950317,0.032165527,-0.0413208,0.014053345,0.022125244,0.060638428,-0.033966064,0.005760193,0.0025634766,0.041290283,0.027252197,-0.004398346,-0.017333984,0.02670288,-0.022003174,0.0029258728,-0.0035171509,-0.0057525635,0.018005371,0.009376526,0.018539429,0.029876709,0.018737793,-0.034088135,-0.033233643,0.005847931,-0.015899658,-0.025634766,0.030731201,0.028457642,0.027877808,-0.01687622,0.03741455,0.032196045,-0.029418945,-0.01209259,-0.013664246,0.042877197,-0.020462036,-0.010414124,0.025238037,-0.009986877,0.012786865,-0.06097412,0.0016260147,0.008605957,0.012016296,-0.016357422,-0.056427002,-0.040771484,0.0035057068,0.021957397,0.015434265,0.0112838745,0.019561768,0.007904053,0.0028095245,0.026123047,-0.005004883,0.004699707,-0.0038166046,-0.051483154,-0.023864746,-0.0008826256,-0.0018520355,-0.026687622,0.013793945,-0.019241333,-0.038146973,0.0038852692,-0.023345947,0.0035858154,-0.012496948,0.017745972,0.03668213,-0.0053901672,0.025909424,-0.017532349,-0.027801514,-0.0009627342,0.0026168823,0.031982422,-0.03591919,0.021865845,-0.010971069,-0.0109939575,-0.0025520325,0.02243042,0.023620605,0.031311035,-0.010467529,0.033447266,-0.042175293,0.029220581,-0.034332275,0.013053894,0.007499695,-0.029724121,-0.020309448,-0.025314331,-0.017425537,0.03201294,-0.022781372,0.0022068024,-0.026046753,-0.03111267,-0.0090408325,-0.051452637,0.019500732,0.02848816,0.042877197,-0.0362854,0.007457733,0.027893066,0.012878418,-0.014930725,-0.005176544,-0.0027828217,0.024276733,0.025360107,0.0013799667,-0.036468506,-0.014282227,0.0047035217,0.007347107,-0.0524292,-0.045532227,-0.0095825195,0.018554688,0.007156372,-0.011390686,-0.024780273,-0.028549194,-0.004737854,-0.030151367,0.021865845,0.0017957687,0.027908325,0.011558533,-0.03201294,0.004802704,0.031951904,-0.033416748,0.03668213,-0.0101623535,-0.02015686,-0.05316162,0.0021362305,0.021362305,0.015159607,0.0044822693,-0.034118652,0.0018081665,-0.027267456,-0.0513916,0.0009741783,-0.014793396,0.009605408,-0.0012931824,-0.012763977,-0.059173584,-0.006877899,-0.018051147,0.0099105835,0.02357483,0.011016846,0.0011720657,0.0018367767,-0.00039076805,-0.01651001,-0.015823364,-0.022598267,0.013938904,0.012130737,0.012809753,0.014518738,0.032714844,-0.0023441315,-0.023223877,0.009338379,-0.0018262863,0.026992798,-0.011192322,0.014465332,-0.015945435,0.0057296753,-0.0000032186508,-0.01625061,-0.027160645,0.004650116,0.072753906,0.006454468,0.017562866,-0.002527237,-0.011833191,0.017410278,0.04208374,-0.04031372,0.0014190674,-0.028900146,0.03640747,-0.010818481,0.0016174316,0.003534317,0.022903442,-0.028457642,-0.05429077,-0.004562378,0.014801025,0.0034236908,-0.061035156,-0.024154663,-0.061828613,-0.0051231384,-0.018539429,-0.02067566,-0.0010499954,0.003850937,-0.013832092,-0.07940674,0.0005927086,0.057525635,0.007843018,0.02079773,-0.0010309219,0.026321411,0.031951904,-0.017349243,-0.013175964,0.020202637,-0.02696228,-0.013832092,-0.028518677,0.043792725,-0.012046814,-0.025039673,0.016189575,0.023208618,0.021972656,0.002735138,0.010940552,-0.009681702,0.013702393,0.0007452965,0.019332886,-0.003768921,-0.013473511,0.029907227,-0.04345703,0.03744507,0.009902954,-0.019042969,0.0037174225,0.020767212,0.042877197,-0.039764404,-0.0121536255,0.031829834,0.0038337708,0.03479004,-0.021011353,0.043792725,0.008888245,-0.007381439,0.0018997192,-0.0033435822,-0.016067505,-0.029083252,-0.028244019,0.03250122,0.0072669983,0.015365601,-0.009025574,-0.016677856,0.015312195,-0.0037517548,0.0066566467,-0.022781372,-0.00009590387,-0.01739502,0.005580902,0.01360321,-0.0059776306,0.0138549805,0.025543213,0.02671814,0.029663086,-0.009048462,-0.009300232,0.015022278,0.032684326,-0.007648468,-0.0025482178,0.0110321045,0.026489258,0.019104004,0.028289795,0.02330017,-0.039031982,-0.018005371,-0.026321411,-0.01574707,-0.013954163,-0.006767273,-0.0050354004,0.0045280457,0.007434845,-0.009567261,-0.041900635,-0.006389618,-0.03366089,-0.038513184,0.0013217926,-0.019088745,0.023788452,0.011962891,0.00756073,0.008071899,-0.0033283234,0.04977417,-0.0012693405,0.0055770874,0.035888672,0.030517578,0.02255249,-0.02859497,-0.005504608,-0.012573242,-0.005760193,0.01852417,-0.015960693,0.0042495728,0.033355713,-0.01928711,0.0099487305,-0.00052785873,0.014503479,0.00995636,0.0011587143,-0.0042915344,0.015266418,-0.02067566,0.038360596,-0.05307007,0.016052246,0.033050537,0.0181427,0.006767273,-0.022079468,-0.022781372,0.019256592,-0.00046300888,-0.00856781,0.0463562,-0.006767273,0.028381348,-0.017944336,-0.037963867,0.0006723404,-0.015197754,-0.018966675,0.023925781,-0.0064811707,0.0005106926,0.004096985,-0.03845215,0.039794922,-0.032684326,0.005382538,0.01626587,0.005138397,-0.0064697266,-0.009498596,0.0033626556,-0.009338379,-0.010772705,-0.0058288574,-0.010147095,0.050933838,0.02406311,0.02633667,0.020477295,0.011314392,0.010635376,-0.036102295,-0.014831543,-0.003145218,-0.019546509,0.019683838,-0.032226562,0.047302246,0.044677734,0.0051078796,0.041015625,0.034423828,0.029663086,-0.0061950684,0.012260437,-0.016067505,0.026611328,-0.025299072,0.008934021,0.0037288666,0.03692627,-0.031311035,0.0140686035,-0.0070610046,0.013755798,-0.030899048,0.030899048,0.06866455,0.025039673,-0.0015287399,0.027999878,-0.01158905,-0.0007677078,-0.008758545,-0.0107803345,0.061462402,0.006652832,0.0413208,0.04272461,0.010902405,-0.0003592968,0.012062073,-0.0231781,-0.022033691,0.05218506,0.035583496,-0.032836914,-0.00041127205,-0.008110046,0.0034732819,-0.03894043,-0.015808105,0.01802063,0.0036392212,0.010192871,-0.016906738,-0.009613037,-0.015213013,0.013694763,0.0031795502,0.0010824203,-0.004711151,0.010803223,0.022216797,-0.0019187927,0.030426025,-0.0017929077,0.024246216,-0.028869629,-0.021072388,0.005836487,0.016937256,-0.0029392242,0.010139465,0.026626587,0.014213562,0.030380249,0.028656006,-0.022964478,-0.0051460266,0.02078247,0.010116577,0.00023686886,0.038909912,0.03048706,0.009849548,0.044036865,0.044158936,0.024932861,-0.02381897,0.016143799,-0.007926941,0.010864258,-0.017654419,-0.015686035,0.01637268,-0.0058784485,0.015037537,0.010887146,-0.01386261,0.021560669,0.018341064,-0.0007715225,-0.0015525818,-0.0104599,0.021484375,-0.011581421,0.0033340454,-0.007007599,-0.0044288635,0.03729248,0.008491516,0.02835083,-0.023483276,0.025268555,0.004508972,-0.019104004,-0.010894775,0.009063721,-0.038909912,0.011558533,-0.016082764,-0.007598877,-0.048706055,0.010559082,0.020553589,-0.0028133392,0.023101807,0.008476257,-0.015052795,-0.0025577545,0.027633667,0.01838684,-0.012825012,-0.00894928,-0.018005371,0.041107178,0.040008545,0.0040016174,-0.004055023,-0.018981934,0.0018014908,0.02178955,-0.0051994324,0.013153076,0.009498596,-0.0024147034,-0.03704834,0.02279663,0.022918701,0.03137207,0.03881836,-0.02281189,-0.0058021545,-0.0037498474,0.034301758,0.009094238,0.0053634644,-0.011398315,0.024765015,-0.007785797,0.044891357,0.03668213,-0.0008368492,0.017425537,-0.015670776,-0.0029582977,0.0055274963,-0.018218994,0.016082764,-0.02458191,0.008720398,-0.010223389,0.030349731,-0.014350891,-0.04550171,0.0024719238,-0.006416321,-0.019577026,-0.027130127,0.014793396,-0.0028266907,0.01637268,0.036865234,0.024353027,-0.024291992,0.06939697,-0.022781372,0.04748535,-0.01701355,-0.016036987,0.058410645,0.032440186,0.030212402,0.009422302,0.015312195,-0.024398804,0.011604309,0.039245605,0.018692017,0.0017824173,0.0010538101,-0.016738892,0.044891357,-0.0038986206,0.03778076,-0.0009880066,-0.00283432,0.012832642,-0.009674072,-0.012992859,-0.005218506,0.0039138794,0.024810791,0.050872803,-0.026412964,-0.009307861,-0.021133423,-0.01889038,0.029251099,-0.010932922,0.006439209,-0.012397766,-0.02017212,0.020126343,-0.027572632,-0.013465881,0.018951416,0.03375244,-0.053588867,-0.019760132,0.0002541542,0.027633667,-0.03640747,0.027770996,0.027557373,-0.008613586,0.022399902,0.035583496,-0.0016555786,0.032928467,-0.0009703636,0.034454346,0.046569824,-0.006477356,-0.017501831,0.002943039,0.009086609,-0.0151901245,0.010787964,0.02999878,-0.00712204,0.003786087,0.0013303757,-0.008636475,-0.006286621,0.011131287,-0.005783081,0.002407074,-0.008834839,-0.011405945,0.0027332306,0.005115509,0.001789093,-0.00027179718,0.0019989014,-0.013694763,0.0023727417,0.036376953,0.01838684,-0.042388916,-0.0022068024,0.012138367,0.007736206,-0.018096924,-0.01965332,-0.017333984,-0.031951904,0.008102417,0.023529053,0.01058197,0.0017166138,-0.028182983,0.0050697327,0.027114868,0.014038086,0.018585205,0.010719299,-0.018310547,0.0012264252,-0.013595581,0.0075645447,-0.008178711,-0.0073013306,0.019195557,0.022583008,-0.0027427673,-0.025268555,0.0345459,0.0022773743,0.00459671,-0.0042533875,-0.0068092346,0.02558899,-0.0068511963,-0.018951416,0.008056641,0.009269714,0.0015535355,-0.025024414,-0.029342651,0.03652954,0.05505371,-0.012954712,0.0027389526,0.013427734,0.0149383545,0.026367188,0.035614014,0.013717651,0.033477783,0.013191223,-0.009155273,-0.02532959,0.023849487,-0.009689331,-0.027038574,0.020324707,-0.00907135,-0.030212402,0.021987915,-0.0049324036,0.003768921,-0.018585205,-0.019760132,-0.007205963,-0.0132369995,0.02355957,0.0011529922,0.0085372925,-0.04244995,-0.016662598,0.021011353,-0.0013561249,-0.04046631,-0.02558899,-0.008514404,-0.01626587,-0.058013916,0.0071144104,-0.020187378,0.008895874,-0.014503479,0.0063552856,0.010139465,0.043945312,-0.0077285767,0.0007596016,-0.0042877197,0.042938232,0.015808105,0.016738892,0.0070877075,-0.021331787,-0.028823853,-0.00983429,-0.0018520355,-0.0057029724,0.015975952,-0.016067505,0.043701172,0.022094727,-0.020935059,0.0003774166,-0.011062622,-0.007621765,-0.010139465,-0.03010559,-0.02017212,0.01272583,0.029525757,-0.013648987,-0.006515503,0.04373169,-0.019104004,-0.014053345,0.029800415,0.03189087,0.0077590942,0.037200928,-0.014625549,-0.012306213,-0.022445679,0.004886627,-0.009681702,0.0084991455,0.010749817,0.0052948,0.0057258606,0.014541626,0.016418457,-0.007205963,0.0037517548,0.026229858,0.02243042,-0.00944519,0.038726807,0.016403198,-0.004940033,-0.011779785,-0.0073547363,0.037841797,0.052215576,0.008491516,0.0065689087,-0.0021705627,0.0038452148,-0.004878998,0.003686905,0.015174866,-0.024261475,-0.039093018,-0.017929077,-0.016525269,0.02748108,-0.011741638,0.013381958,-0.0071372986,0.015777588,-0.003604889,-0.035125732,-0.012107849,0.025131226,0.0024204254,-0.018096924,-0.007850647,0.011054993,0.024536133,-0.03527832,0.0009889603,-0.052001953,-0.030014038,-0.029907227,-0.021148682,0.02279663,-0.0009279251,-0.0011863708,-0.0013380051,0.0004003048,-0.0036125183,0.007270813,0.017929077,-0.0096206665,-0.00274086,0.011405945,0.02017212,-0.0109939575,0.016357422,0.0032749176,-0.0074501038,0.0030956268,-0.020812988,0.021026611,-0.0131073,0.027908325,0.013999939,-0.013305664,0.03048706,0.00059604645,0.026016235,-0.0024738312,-0.00042510033,-0.006603241,-0.0032138824,0.03793335,-0.014915466,-0.018447876,0.007484436,-0.010246277,-0.0368042,0.009140015,0.028137207,0.027008057,-0.020477295,0.05444336,-0.0042152405,-0.0064735413,0.018188477,0.0146102905,-0.008361816,0.0006508827,0.025665283,0.00061798096,0.0024662018,-0.00058460236,-0.016662598,-0.026992798,-0.01939392,0.0137786865,-0.005962372,-0.01512146,0.027252197,0.015716553,0.03918457,-0.0071983337,0.025100708,0.028839111,-0.009361267,0.033721924,0.015144348,0.04321289,0.005466461,-0.03152466,-0.004989624,-0.00062561035,-0.016220093,0.011436462,-0.008277893,0.010574341,-0.03463745,0.0098724365,0.014312744,0.026382446,-0.025466919,0.014259338,-0.022155762,-0.0012779236,-0.023269653,0.0037174225,-0.027496338,0.0034942627,0.04373169,0.022918701,0.009803772,-0.008003235,-0.02218628,0.035583496,0.05029297,0.008079529,-0.03152466,-0.0138168335,0.0059280396,-0.012756348,-0.00092697144,-0.004966736,-0.029907227,-0.026947021,-0.012008667,-0.015396118,0.0004441738,-0.008972168,0.028457642,0.011413574,-0.013961792,0.0030841827,0.01889038,-0.010368347,0.008605957,0.015541077,-0.009414673,0.027328491,0.035308838,-0.023544312,0.021133423,0.021575928,-0.038879395,0.052825928,0.005592346,0.015960693,-0.011932373,0.011360168,-0.038482666,-0.0009584427,-0.00617218,0.010940552],"createdAt":"2026-04-18T18:43:47.929Z","updatedAt":"2026-04-22T10:01:40.619Z","lastSeenAt":"2026-04-22T10:01:40.619Z","tsv":"'/api':185 '/api/v1/cards/71':67,220 '/docs':184 '/pricing':186 '/readme':188 '/request':17,34,158 '0.02':16,33,102,157 '000':94 '0x8335':99 '20':93 '402 payment API' '6':107 'Base USDC API' 'accept':75 'access':45,73,172,224 'advertis':112 'ai':10,27,124 'amount':91 'analysi':128 'analyt':118 'api':4,21,41,72,116,165,223 'authent':177 'avail':250 'base':7,24,61,95 'behind':51,219 'beyond':246 'broader':110 'categori':114 'challeng':87 'claim':163 'classif':131 'connect':194 'content':200 'convers':148 'correspond':230 'data':9,26,117,121 'decim':108 'descript':245 'detail':211 'document':179,212 'embed':132 'endpoint':14,31,50,65,151,215,236 'equal':101 'estim':142 'exact':83,217 'exampl':208 'exchang':137 'export':122 'extrem':181 'feed':136 'financ':11,28,133 'four':113 'function':218 'gas':141 'gate':3,20,44 'generat':149 'geocod':146 'indic':88 'infrastructur':144 'insight':123 'instant':171 'json-response' 'key':166 'label':221 'land':239 'learn':126 'limit':169 'list':69,153 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':125 'marketplac':42 'max':90 'mechan':178 'metric':119 'micropay':55 'micropayment API' 'name':235 'network':62 'offer':8,25 'openapi':204 'page':189,240 'pay-per-request API' 'payment':79,173 'per':53,103 'per-request':52 'per-request-micropayment' 'platform':5,22,111,162 'point':160 'post':76 'post-api' 'premium':71,222 'price':135,159 'prompt':196 'protocol':40 'quot':140 'rate':138,168 'report':120 'request':54,77,104 'request/response':207 'return':191 'schema':205,243 'scheme':84 'sentiment':127 'settl':56 'spars':182 'specif':64 'substant':199 'summar':130 'text':129 'titl':248 'token':139 'unclear':226 'unit':96 'usdc':58,98,105 'usdc-base' 'use':106 'util':13,30,145 'valid':147 'varieti':48 'via':80 'wallet':195 'web3':134 'x402':2,19,39,82,86 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"6cac787c-01bc-44c0-bc61-e84575d368b8","listingId":"7c0eb9da-b980-4f1b-b19e-6828e92c70f2","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:47.929Z"}],"sources":[{"listingId":"7c0eb9da-b980-4f1b-b19e-6828e92c70f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:47.929Z","lastSeenAt":"2026-04-22T10:01:40.619Z"}],"details":{"listingId":"7c0eb9da-b980-4f1b-b19e-6828e92c70f2","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a signed USDC payment on Base.\n# Using curl as a conceptual example (actual payment header must be constructed per x402 spec):\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/71 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/71"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform claims no API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API endpoints without API key registration","Making micropayment-gated requests settled on Base L2 in USDC","Programmatic agent access to utility or data endpoints via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.261Z"},"updatedAt":"2026-04-22T10:01:40.619Z"}}