{"id":"7e8b0ef8-36c7-439e-ad14-2119e3a745a6","shortId":"GnXhvh","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with each request.\n\nThe specific endpoint at `/api/v1/payments/280` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind each endpoint is unclear beyond the category labels on the landing page.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","no-api-key endpoint"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or schema definitions found; request and response formats are unknown","The specific purpose of /api/v1/payments/280 ('Premium API Access') is not explained anywhere on the site","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/280","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/payments/280","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/payments/280 is not described anywhere.","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":"2026-04-19T07:01:28.078Z","embedding":[-0.02255249,-0.023483276,0.03050232,0.010253906,0.019042969,-0.029586792,-0.024398804,0.038024902,0.06451416,-0.06048584,0.023132324,-0.05303955,-0.024917603,-0.035125732,-0.015991211,0.013290405,-0.0015258789,0.00001001358,-0.032104492,0.032562256,0.025115967,-0.004558563,-0.03982544,0.028717041,-0.005748749,-0.013755798,-0.0009965897,0.0034103394,-0.018493652,-0.046936035,0.047454834,-0.027130127,-0.0076179504,0.011993408,-0.007873535,-0.01184845,-0.0006451607,0.031143188,0.027496338,-0.008384705,-0.0057029724,-0.0637207,0.0050735474,-0.006603241,-0.056762695,-0.007507324,0.014533997,-0.015472412,0.0056877136,-0.002008438,-0.047973633,-0.009422302,-0.015655518,0.005279541,0.0014190674,0.015388489,-0.011543274,-0.012542725,0.0062789917,0.01007843,-0.0013217926,-0.050720215,-0.022903442,-0.0010004044,0.004360199,0.050811768,-0.0071983337,0.034576416,0.004512787,0.066345215,0.04345703,0.044403076,0.027542114,0.00894928,-0.0017375946,-0.0048599243,-0.005214691,0.05606079,-0.01058197,-0.02809143,-0.0018205643,-0.0077819824,-0.048553467,0.0011348724,-0.021835327,-0.05368042,-0.02029419,0.026748657,-0.02192688,0.02897644,-0.07055664,-0.0061149597,-0.021911621,-0.0038452148,0.009162903,-0.00035643578,-0.004432678,0.02319336,-0.011955261,0.011459351,-0.01474762,-0.044006348,0.0076828003,0.0105896,0.038757324,0.048431396,0.009757996,0.011856079,0.014015198,-0.009857178,-0.043914795,0.012161255,-0.015975952,-0.0066223145,0.0058631897,0.009880066,-0.017028809,0.011169434,-0.029022217,0.01272583,-0.052124023,0.06225586,0.016098022,0.01008606,0.0018720627,-0.047912598,-0.018539429,0.020095825,-0.024124146,-0.0149383545,0.023910522,0.014274597,0.020355225,-0.013679504,-0.041137695,0.018096924,-0.023635864,0.00075006485,-0.04949951,-0.03543091,0.04095459,-0.033721924,0.018463135,0.034423828,-0.09863281,-0.015083313,-0.040802002,0.0015487671,-0.035583496,-0.011398315,0.0077590942,0.023376465,-0.023620605,-0.022857666,-0.024765015,-0.02053833,-0.004337311,0.03286743,-0.010368347,0.043182373,-0.017089844,0.027420044,0.0149002075,0.0024547577,0.013412476,0.034423828,-0.003610611,-0.08258057,-0.08123779,-0.022369385,-0.0066184998,-0.026397705,-0.022705078,0.00932312,0.0015306473,-0.06921387,-0.016799927,-0.016235352,-0.0056037903,-0.044708252,0.0005941391,-0.021331787,0.013618469,0.00044989586,-0.05267334,-0.029144287,-0.029129028,0.057678223,0.025482178,0.027252197,0.022216797,-0.014663696,0.06713867,0.022949219,-0.0140686035,-0.018325806,0.018203735,-0.022506714,0.025482178,-0.0043792725,0.014526367,-0.021835327,0.045074463,0.06817627,0.008506775,-0.024887085,-0.0058555603,-0.05722046,-0.061462402,-0.0368042,0.020812988,0.005218506,0.0025463104,0.031021118,-0.04196167,-0.031021118,0.00051403046,0.019836426,0.015930176,0.06951904,0.01626587,-0.008026123,0.0335083,0.019088745,-0.05078125,0.040283203,0.038970947,0.017044067,-0.020324707,-0.025009155,0.03579712,0.037353516,-0.022735596,0.02458191,-0.017532349,0.023284912,-0.0027332306,0.00843811,0.012619019,-0.014289856,-0.018203735,-0.021942139,-0.020843506,0.027770996,0.015792847,-0.027908325,-0.033447266,-0.08148193,0.051605225,0.021499634,0.040985107,0.00844574,-0.0009870529,-0.019927979,-0.0135269165,-0.07733154,0.054107666,0.076171875,0.005973816,-0.013450623,0.020965576,-0.0065841675,-0.03274536,0.0050239563,-0.009742737,-0.0309906,-0.022888184,0.01878357,-0.048339844,-0.002571106,0.026794434,0.016921997,0.051605225,-0.012420654,-0.04269409,-0.022918701,-0.0028018951,-0.0071907043,-0.035614014,0.0016288757,-0.0043029785,0.020629883,0.028579712,-0.0016412735,0.019882202,-0.0034008026,0.0037670135,-0.006801605,-0.0035991669,-0.011352539,-0.027862549,0.014701843,0.0043563843,-0.05343628,0.014213562,-0.00434494,0.07672119,-0.04510498,0.03817749,-0.020599365,0.017593384,0.04421997,-0.0056266785,-0.04748535,0.006855011,0.02519226,0.020950317,0.05960083,0.013809204,-0.03189087,-0.009117126,0.07458496,-0.004398346,0.001996994,0.013580322,0.016784668,0.03970337,-0.009300232,-0.04864502,-0.05105591,-0.009773254,-0.026916504,0.03363037,-0.023269653,0.021774292,-0.008865356,0.009681702,-0.02128601,0.0075531006,-0.030838013,0.010681152,-0.014175415,0.012466431,-0.0040893555,-0.028030396,0.0062828064,0.01789856,-0.0046539307,0.011444092,0.048553467,0.016723633,-0.0044822693,-0.03286743,-0.036834717,-0.006969452,-0.011306763,0.013549805,0.02583313,0.024856567,0.05996704,-0.03540039,-0.0019435883,0.026748657,0.010292053,0.039245605,-0.0037403107,-0.007293701,-0.062347412,-0.04925537,-0.026062012,-0.045959473,0.023712158,0.020339966,-0.007965088,0.051879883,0.0010986328,-0.014656067,-0.04043579,0.01574707,-0.03753662,-0.0033493042,0.040222168,-0.021697998,-0.039520264,0.008522034,-0.012130737,0.004650116,0.034332275,0.014213562,0.02406311,0.062408447,0.034851074,0.0116119385,0.01977539,0.0056762695,0.02684021,0.010185242,-0.020477295,-0.023040771,-0.010734558,0.027832031,-0.024627686,-0.027954102,-0.060577393,0.06793213,0.040527344,0.078125,0.016525269,0.010398865,0.040924072,-0.01737976,0.01713562,-0.023330688,-0.013343811,-0.028686523,-0.051483154,0.035369873,-0.008460999,-0.009384155,-0.015777588,0.040252686,-0.0046195984,0.016189575,-0.025543213,0.04046631,-0.016571045,-0.0059318542,0.02079773,0.008163452,0.06225586,0.061767578,-0.05343628,0.020690918,0.020736694,-0.03540039,0.0049476624,0.040252686,-0.01953125,-0.0039253235,-0.054718018,-0.03086853,-0.009010315,-0.012893677,-0.05178833,0.009735107,0.0023822784,0.025177002,0.029586792,-0.015419006,-0.007663727,-0.002626419,-0.021270752,-0.061523438,0.0012845993,-0.03302002,-0.005420685,0.029022217,-0.024429321,-0.0093688965,-0.0065956116,-0.011779785,0.0026416779,0.022781372,0.03515625,0.0017585754,-0.056854248,0.042663574,0.004032135,0.012741089,0.015571594,0.041290283,0.023910522,0.01864624,0.043182373,0.011444092,-0.025131226,-0.06951904,0.018417358,-0.041656494,0.009407043,0.020370483,-0.02532959,-0.007041931,-0.015213013,-0.03375244,-0.033599854,0.009010315,-0.022628784,0.004989624,0.021621704,-0.022018433,-0.019439697,-0.056396484,-0.026748657,-0.003129959,0.072631836,0.014266968,0.00008165836,-0.05545044,-0.0045051575,0.015380859,0.0060157776,0.042114258,-0.0141067505,-0.007499695,-0.011474609,-0.03793335,-0.0037059784,-0.025375366,0.020812988,-0.018920898,0.00047898293,0.01574707,0.016311646,0.018676758,0.006542206,0.008850098,0.01739502,-0.03201294,-0.005607605,-0.014831543,0.030761719,0.019317627,0.00058555603,-0.0390625,0.04586792,0.014961243,0.033966064,-0.035064697,-0.009124756,-0.0038375854,0.0050239563,0.016738892,-0.004989624,-0.015045166,-0.009468079,-0.045562744,-0.06573486,0.037231445,-0.025421143,0.01902771,0.02218628,0.009513855,0.024459839,-0.015602112,0.0073661804,0.015991211,-0.02420044,-0.00843811,-0.023117065,-0.030212402,-0.013809204,-0.012336731,-0.03062439,0.023208618,-0.02168274,0.009384155,-0.005809784,-0.025985718,0.031219482,0.004085541,-0.009101868,0.015419006,0.0063438416,0.022598267,0.04034424,0.0079193115,-0.04147339,0.026489258,0.006298065,0.010482788,-0.009033203,0.046447754,0.03768921,-0.008346558,-0.0076560974,-0.0099105835,-0.025161743,-0.025756836,0.00623703,0.0037822723,0.0064888,-0.0027656555,-0.049926758,0.01713562,0.0013494492,-0.02709961,-0.025619507,0.008979797,0.0050239563,-0.038146973,0.015914917,0.018753052,0.05026245,-0.024291992,0.0022449493,0.0016794205,0.031311035,0.03338623,0.009788513,-0.0033550262,0.01499939,-0.013114929,0.009552002,-0.01525116,-0.014312744,0.022537231,-0.0049476624,0.022567749,0.026992798,0.010932922,-0.026992798,-0.0335083,0.0052948,-0.017715454,-0.03164673,0.020904541,0.020950317,0.023803711,-0.03277588,0.018295288,0.017333984,-0.020568848,-0.023010254,-0.011932373,0.042541504,-0.007534027,-0.010025024,0.01802063,0.013374329,0.029510498,-0.052886963,-0.0044174194,0.0011062622,0.009857178,-0.024459839,-0.04498291,-0.042175293,0.011138916,0.036224365,0.011955261,0.031311035,0.036865234,0.002664566,0.00497818,0.018859863,-0.005065918,-0.02142334,-0.007843018,-0.05267334,-0.026794434,-0.014602661,0.0026016235,-0.029510498,0.015213013,-0.0013227463,-0.031799316,0.0029335022,-0.005771637,-0.011138916,-0.004070282,0.01436615,0.04345703,0.0019111633,0.020355225,-0.023040771,-0.03579712,-0.0041542053,0.004924774,0.020599365,-0.052856445,0.012908936,-0.010566711,-0.0069122314,-0.0011949539,0.009155273,0.01751709,0.024856567,0.019836426,0.029846191,-0.037506104,0.052886963,-0.046661377,0.018218994,-0.0015382767,-0.03253174,-0.012420654,-0.026489258,-0.011383057,0.04156494,-0.029693604,-0.0014629364,-0.030914307,-0.038757324,-0.017791748,-0.057739258,0.015602112,0.047180176,0.045410156,-0.02684021,0.001996994,-0.0013561249,0.0020771027,-0.012771606,0.0028438568,-0.012802124,0.024780273,0.020385742,0.0063819885,-0.01876831,-0.031204224,-0.019760132,-0.0026359558,-0.035949707,-0.051483154,-0.011886597,0.005077362,-0.008117676,-0.015159607,-0.03677368,-0.048065186,0.00217247,-0.036102295,0.009864807,0.009025574,0.013748169,0.009811401,-0.0259552,0.0032730103,0.022705078,-0.020462036,0.03338623,0.0035362244,-0.014640808,-0.042053223,0.004825592,0.015380859,0.011558533,-0.0071792603,-0.013679504,-0.001742363,-0.021331787,-0.057373047,0.006893158,-0.008407593,-0.009796143,-0.0074691772,0.0077590942,-0.050109863,-0.00970459,-0.02017212,0.0033817291,0.028289795,0.02407837,0.008850098,-0.0036964417,0.017974854,-0.0011558533,-0.012786865,-0.03741455,0.015090942,0.010551453,0.0009069443,0.03414917,0.04348755,0.002166748,-0.02772522,0.0135650635,0.015403748,0.018493652,-0.016418457,0.0013427734,-0.024169922,0.012428284,-0.014434814,-0.011077881,-0.03579712,-0.0013532639,0.08465576,-0.0026855469,-0.0035114288,-0.01234436,-0.018585205,0.01626587,0.0340271,-0.041656494,-0.0020046234,-0.021408081,0.01373291,-0.023391724,0.0061912537,0.0038585663,0.026397705,-0.015945435,-0.051086426,-0.016799927,-0.013641357,-0.009025574,-0.07519531,-0.032196045,-0.082458496,0.00793457,-0.014030457,-0.025878906,-0.0025463104,0.012962341,-0.026763916,-0.07836914,0.0029144287,0.04751587,0.0022716522,0.023422241,-0.008346558,0.019699097,0.0256958,-0.031829834,0.001991272,0.031097412,-0.025024414,-0.020614624,-0.01675415,0.01902771,-0.012886047,-0.0046539307,0.0018815994,0.011566162,0.01889038,-0.009857178,0.010536194,-0.0035266876,0.03250122,-0.020492554,0.012374878,-0.0076522827,-0.012199402,0.039764404,-0.04663086,0.019836426,0.007007599,-0.015930176,0.010673523,0.03515625,0.050109863,-0.031555176,-0.023880005,0.023345947,0.017120361,0.031921387,-0.01979065,0.050750732,0.0124435425,-0.018585205,0.0059127808,-0.004348755,-0.01184845,-0.02760315,-0.034118652,0.025909424,-0.0023155212,0.011985779,-0.0132369995,-0.0018205643,0.021499634,0.0028076172,0.013069153,-0.0068855286,-0.015220642,-0.019332886,-0.0033054352,0.0007266998,0.007671356,-0.00092315674,0.026657104,0.030654907,0.030883789,0.0039863586,-0.009811401,-0.0008778572,0.03086853,-0.012023926,-0.00037837029,0.029663086,0.011222839,0.013786316,0.027694702,0.00774765,-0.05117798,-0.0087890625,-0.034820557,-0.020996094,0.00029110909,-0.010726929,-0.010925293,-0.006324768,0.0044517517,-0.018066406,-0.029312134,-0.0032806396,-0.02935791,-0.026306152,-0.008338928,-0.014045715,0.021575928,0.004081726,0.005584717,0.009246826,-0.010505676,0.045135498,-0.007499695,-0.014717102,0.038513184,0.033935547,0.016784668,-0.03604126,-0.007003784,-0.012168884,-0.012336731,0.00894928,-0.0395813,0.011634827,0.047790527,-0.020858765,-0.0005707741,0.00434494,0.027954102,-0.008407593,-0.0020446777,-0.006000519,0.01687622,-0.008560181,0.03338623,-0.04901123,0.015304565,0.011268616,0.0045700073,-0.0068206787,-0.014312744,-0.021896362,0.013328552,0.0006456375,-0.0104522705,0.0574646,0.008575439,0.029464722,-0.021759033,-0.032287598,0.011459351,-0.028533936,-0.018417358,0.023910522,-0.00843811,0.00233078,0.017425537,-0.011993408,0.029129028,-0.03439331,0.013549805,0.013679504,0.0065460205,-0.0019016266,-0.009506226,-0.010971069,-0.0075149536,-0.013000488,0.0031280518,-0.0064926147,0.047027588,0.013412476,0.025802612,0.050842285,0.010971069,0.0009455681,-0.037506104,-0.03062439,-0.006210327,-0.021972656,0.013618469,-0.012268066,0.05731201,0.038330078,0.012771606,0.037261963,0.030654907,0.034484863,-0.0050811768,0.0059776306,-0.0149002075,0.019363403,-0.0059432983,0.024810791,0.001543045,0.036834717,-0.042999268,0.020812988,0.011917114,0.02003479,-0.019470215,0.032440186,0.05581665,0.018371582,-0.014289856,0.040618896,-0.004020691,-0.009689331,-0.011352539,-0.018218994,0.051239014,0.010284424,0.044281006,0.05142212,0.0067710876,-0.0011835098,0.019134521,-0.039276123,-0.026107788,0.06414795,0.021347046,-0.022262573,-0.009780884,-0.0025634766,0.005783081,-0.045928955,-0.024536133,0.02142334,-0.0013723373,-0.0014619827,-0.0017738342,-0.013183594,-0.02017212,-0.0017538071,0.015510559,0.014328003,-0.014190674,0.026046753,0.02305603,0.0040626526,0.030578613,-0.0078048706,0.032409668,-0.024749756,-0.02897644,0.018463135,0.021347046,-0.013320923,-0.0071525574,0.029205322,0.003604889,0.03894043,0.038970947,-0.021774292,0.0038871765,0.024337769,0.01436615,-0.0012578964,0.06567383,0.034423828,0.0116119385,0.03704834,0.027648926,0.032440186,-0.047210693,0.01751709,0.009468079,0.0101623535,-0.012687683,-0.014732361,0.0014343262,-0.015312195,0.020751953,-0.0076293945,-0.018814087,0.030349731,0.022079468,-0.004611969,-0.0054359436,-0.008178711,0.009460449,-0.03201294,-0.0057029724,0.008071899,-0.015274048,0.039276123,0.015571594,0.028793335,-0.028533936,0.02229309,0.0021953583,-0.0121536255,-0.0019350052,0.023742676,-0.037872314,0.0013494492,-0.0019025803,-0.0018901825,-0.0440979,0.007041931,0.026397705,-0.0079574585,0.025527954,0.015899658,-0.0019741058,-0.011566162,0.024276733,0.008422852,0.000040769577,-0.008369446,-0.024871826,0.027770996,0.03527832,-0.002204895,0.0016126633,-0.027542114,-0.006149292,0.0025119781,-0.01058197,0.00040125847,-0.008079529,-0.023223877,-0.016357422,0.0143966675,0.028945923,0.026687622,0.054870605,-0.024612427,-0.018753052,0.009338379,0.03677368,0.0020332336,0.0004529953,-0.003332138,0.027175903,-0.022598267,0.043792725,0.03677368,0.012214661,0.029846191,-0.0028247833,-0.01171875,0.018295288,-0.010536194,0.023773193,-0.014198303,0.002380371,-0.0072669983,0.024734497,-0.008811951,-0.03515625,0.012741089,-0.014160156,-0.024932861,-0.021957397,0.016571045,0.0024490356,0.034851074,0.040252686,0.02279663,-0.03225708,0.05795288,-0.018417358,0.04559326,0.0013008118,-0.022079468,0.055145264,0.023544312,0.031799316,0.017837524,0.016067505,-0.03488159,0.018936157,0.037078857,0.02998352,0.0063285828,0.0057754517,-0.017547607,0.034301758,0.00056791306,0.03439331,-0.007736206,0.008163452,0.009628296,-0.0042381287,-0.012542725,-0.010948181,-0.0060653687,0.0037193298,0.042877197,-0.022857666,-0.017242432,-0.02760315,-0.015838623,0.025024414,-0.013885498,0.0031909943,-0.003578186,-0.029647827,0.0048828125,-0.032226562,-0.027801514,0.009513855,0.022140503,-0.046783447,-0.0044136047,0.0023994446,0.020370483,-0.023483276,0.030029297,0.02432251,-0.0034046173,0.01247406,0.040222168,-0.009475708,0.025314331,-0.011131287,0.028762817,0.030944824,0.009590149,-0.012634277,-0.0032863617,0.009765625,-0.004096985,0.015388489,0.03543091,-0.015289307,0.0065727234,-0.0027866364,-0.0030212402,-0.000916481,0.0030918121,-0.006679535,0.0050354004,-0.008178711,-0.0057678223,-0.0013799667,0.011154175,0.0013866425,0.009559631,-0.0064582825,-0.016067505,0.00818634,0.03253174,0.016815186,-0.031982422,-0.0030269623,0.0035152435,0.0070610046,-0.0149002075,-0.004814148,-0.007610321,-0.037963867,0.014030457,0.02041626,0.006286621,0.011009216,-0.030288696,0.0028858185,0.019699097,0.0046577454,0.01776123,0.0061950684,-0.008644104,0.0021076202,-0.012390137,-0.0075798035,-0.004047394,-0.011993408,0.009284973,0.031173706,0.003156662,-0.03277588,0.025146484,-0.000115811825,0.011474609,-0.004146576,-0.011329651,0.018310547,-0.008636475,0.001584053,0.0023002625,0.012001038,-0.011520386,-0.0107421875,-0.015670776,0.038116455,0.0541687,-0.010902405,-0.014312744,0.017288208,0.012542725,0.021133423,0.039733887,-0.0031394958,0.041107178,0.016174316,-0.020248413,-0.021636963,0.020339966,-0.012054443,-0.026367188,0.014915466,-0.0119018555,-0.004688263,0.019317627,0.0036640167,0.005870819,-0.033233643,-0.009086609,-0.0063438416,-0.016433716,0.023025513,-0.007835388,0.014533997,-0.025894165,-0.0128479,0.009162903,-0.025360107,-0.053985596,-0.017990112,-0.00001335144,-0.012123108,-0.0574646,-0.00020205975,-0.026748657,0.006664276,-0.022613525,0.0026760101,-0.014884949,0.022003174,-0.019363403,-0.0073661804,0.0005836487,0.026290894,0.030548096,0.0004284382,0.01953125,-0.0335083,-0.01247406,-0.024307251,0.015068054,-0.012428284,0.024398804,0.00381279,0.033569336,0.02432251,-0.015960693,-0.0022735596,-0.010391235,-0.008293152,-0.012809753,-0.01737976,-0.024520874,0.027130127,0.014587402,-0.011352539,-0.011360168,0.038146973,-0.0284729,-0.008293152,0.020584106,0.046966553,0.012084961,0.029464722,-0.01373291,0.0014381409,-0.017288208,-0.0014925003,-0.019439697,0.008308411,0.009170532,0.0062713623,-0.009246826,0.007183075,0.018249512,-0.014526367,-0.0031528473,0.038360596,0.008087158,-0.00749588,0.041290283,0.015838623,0.0013093948,-0.00793457,-0.0068130493,0.016403198,0.049560547,0.0040664673,0.015701294,-0.009246826,0.0060424805,-0.011054993,0.009300232,0.018127441,-0.022506714,-0.047607422,-0.016433716,-0.040985107,0.029953003,-0.011482239,0.007003784,-0.010360718,0.014511108,-0.01474762,-0.037872314,-0.008300781,0.025619507,0.009391785,-0.011756897,-0.0068359375,0.01499176,0.014823914,-0.034942627,-0.00623703,-0.048614502,-0.035614014,-0.017303467,-0.01927185,0.026794434,0.010551453,-0.0107803345,0.0014343262,0.003320694,0.0060424805,0.003042221,0.026367188,-0.0030879974,-0.00843811,0.022232056,0.0231781,-0.013397217,0.017868042,-0.012390137,0.00082206726,0.005455017,-0.0126953125,0.016998291,-0.013717651,0.028945923,-0.011932373,-0.004512787,0.031677246,0.0008940697,0.008476257,-0.028427124,0.0063209534,0.0035037994,-0.004211426,0.039215088,-0.032165527,-0.022125244,0.011375427,-0.014457703,-0.025543213,0.0052986145,0.018051147,0.037841797,-0.007156372,0.047576904,-0.014289856,-0.0047302246,0.015716553,0.010971069,-0.014656067,0.0056610107,0.03289795,0.010772705,-0.0026168823,0.001326561,-0.00724411,-0.02861023,-0.015312195,0.017181396,-0.0031166077,-0.01689148,0.03326416,0.015640259,0.05014038,-0.011016846,0.016784668,0.0132369995,0.0015182495,0.031677246,0.009979248,0.061553955,-0.007987976,-0.03173828,0.0061416626,0.0010004044,-0.021636963,0.0054893494,-0.0007176399,0.0033454895,-0.037261963,0.009963989,-0.0012607574,0.021728516,-0.019241333,0.016311646,-0.022567749,-0.0149002075,-0.039154053,-0.009292603,-0.03338623,0.011909485,0.031677246,0.010238647,0.029327393,0.0019798279,-0.025024414,0.028625488,0.04800415,-0.0021018982,-0.031585693,-0.019134521,0.0062561035,-0.0057640076,0.013473511,0.003168106,-0.022232056,-0.018798828,-0.0032958984,-0.018951416,0.0032653809,-0.004447937,0.017837524,0.008460999,-0.0036792755,-0.0012903214,0.018417358,-0.009666443,-0.008018494,0.012229919,0.0040626526,0.04425049,0.034729004,-0.015945435,0.025360107,0.014190674,-0.04711914,0.055877686,-0.0016937256,0.030395508,-0.019042969,0.010803223,-0.038726807,-0.01965332,-0.013641357,0.00522995],"createdAt":"2026-04-18T18:50:14.388Z","updatedAt":"2026-04-23T04:01:32.055Z","lastSeenAt":"2026-04-23T04:01:32.055Z","tsv":"'/api':173 '/api/v1/payments/280':107 '/docs':172 '/pricing':174 '/readme':176 '/request':13,30 '0.02':12,29,68,128,131,164 '000':123 '20':122 '402':117 'access':113 'across':54 'actual':209 'advertis':91,137 'ai-inference' 'ai/ml':57 'also':136 'analysi':141 'analyt':56 'api':5,15,22,32,41,84,112 'attach':94 'avail':203 'base':8,25,76,124,133 'base network api' 'behind':211 'beyond':216 'broad':46 'call':4,21 'caller':92 'catalog':47 'categori':218 'challeng':118 'classif':144 'classification' 'connect':182 'convers':156 'crawl':206 'crypto-quotes' 'data':55,158 'data-analytics' 'detail':189 'document':167,198 'embed':145 'embeddings' 'enabl':40 'endpoint':53,64,105,138,213 'estim':153 'exampl':202 'exchang':148 'extrem':169 'feed':147 'finance-data' 'finance/web3':59 'function':210 'gas':152 'generat':159 'geocod':154 'geocoding' 'header':99 'i.e':130 'infer':58 'key':16,33,85 'label':219 'land':222 'limit':89 'list':109 'low payment fee' 'lowpaymentfee.com':35 'materi':207 'micropayment api' 'network':9,26,77 'no-api-key endpoint' 'offer':44 'openapi':193 'page':177,223 'paid':71 'pay':2,19,50 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':49 'payment':81,98 'per':3,20,51,69 'platform':6,23,42,135 'point':166 'premium':111 'price':66,146,165 'prompt':184 'protocol':82 'quot':151 'rate':88,149 'render':179 'request':52,70,102,119 'request/response':196 'requir':17,34 'return':115 'schema':197 'sentiment':140 'sentiment-analysis' 'servic':62 'simpli':93 'spars':170 'spec':194 'specif':104 'subscript':86 'summar':143 'technic':188 'text':142 'text-summarization' 'token':150 'unclear':215 'unit':125 'usag':201 'usdc':73,127,129 'usdc api access' 'usdc-base-network' 'use':78 'util':61 'valid':155 'validation' 'via':10,27 'wallet':183 'x':97 'x-payment':96 'x402':11,28,39,80 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"f1a3dfa7-5057-4eb8-af15-55c18e4fca25","listingId":"7e8b0ef8-36c7-439e-ad14-2119e3a745a6","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/payments/280","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:14.388Z"}],"sources":[{"listingId":"7e8b0ef8-36c7-439e-ad14-2119e3a745a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/280","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:14.388Z","lastSeenAt":"2026-04-23T04:01:32.055Z"}],"details":{"listingId":"7e8b0ef8-36c7-439e-ad14-2119e3a745a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/280 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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 402 challenge for /api/v1/payments/280 requests maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/280"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis without subscriptions","Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments","Performing geocoding, data validation, or format conversion with zero setup"],"bestFor":["Developers wanting instant API access without signup or API key management","Agents and bots that can settle x402 payments autonomously on Base","Low-volume or exploratory usage where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.639Z"},"updatedAt":"2026-04-23T04:01:32.055Z"}}