{"id":"1ba09d78-367b-462a-b4f7-16ec4d5e7866","shortId":"Em2eQp","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/endpoint-57` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. All endpoints are accessed via the x402 payment protocol on the Base network, settling in USDC (USD Coin). The platform advertises a flat $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/endpoint-57` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that generic title. The x402 challenge confirms it is live, accepts POST requests, and requires a USDC payment of up to 20,000 base units (0.02 USDC, i.e., $0.02) on the Base network. The response MIME type is `application/json`. No OpenAPI schema, detailed input/output documentation, or usage examples were found in the crawled material — the docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nThe broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, it is unclear which (if any) of these corresponds to `/api/endpoint-57`, and no schema or parameter documentation is available for this specific route.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access"],"warnings":["No documentation available for /api/endpoint-57 — its actual functionality is unknown","All docs, pricing, API, and README pages returned only 'Connect wallet' with no content","No OpenAPI schema or input/output specification found","The endpoint path '/api/endpoint-57' does not match any of the named endpoints listed on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-57","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/endpoint-57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for what /api/endpoint-57 actually does, no input/output schema, no examples, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The generic 'Premium API Access' label provides no functional clarity.","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":"2026-04-18T21:03:23.473Z","embedding":[-0.027236938,-0.039001465,0.04736328,0.017837524,0.010803223,-0.02029419,-0.023117065,0.044189453,0.09295654,-0.07446289,0.024978638,-0.04888916,-0.03479004,-0.037200928,-0.03463745,0.0054740906,-0.002357483,0.0011110306,-0.03488159,0.03744507,0.022033691,-0.025009155,-0.029769897,0.041107178,0.009536743,-0.015068054,-0.01235199,-0.0048065186,-0.014213562,-0.02998352,0.04168701,-0.024169922,0.00806427,0.0058403015,-0.027053833,-0.0073547363,-0.009490967,0.03845215,0.03414917,-0.017074585,-0.007911682,-0.06329346,-0.00003606081,-0.01574707,-0.05609131,-0.0096588135,0.010612488,-0.01927185,0.0034122467,0.002658844,-0.03668213,-0.008644104,-0.000008583069,-0.005859375,-0.00026607513,-0.003358841,0.004737854,-0.010978699,0.012756348,0.009788513,0.014076233,-0.06994629,-0.016693115,0.0010414124,-0.0038280487,0.055725098,-0.017196655,0.047668457,0.0079193115,0.052764893,0.049591064,0.056243896,0.024902344,0.011009216,0.00680542,-0.0016736984,0.008407593,0.059295654,-0.020004272,-0.020568848,-0.019012451,-0.0026168823,-0.042907715,0.00078201294,-0.011726379,-0.049743652,-0.020004272,0.016067505,-0.028427124,0.034210205,-0.07556152,-0.00699234,-0.012542725,0.0010499954,0.010505676,-0.0061149597,-0.015792847,0.01612854,-0.013969421,0.021408081,0.013137817,-0.037750244,0.0019207001,0.008987427,0.040527344,0.04333496,0.02645874,0.030654907,0.0061683655,-0.011329651,-0.025177002,0.018447876,-0.020553589,-0.014007568,0.016098022,0.010147095,-0.02897644,0.022628784,-0.029800415,0.02822876,-0.04510498,0.046783447,0.008468628,-0.0079574585,0.015510559,-0.04373169,-0.004962921,0.01701355,-0.029159546,-0.019058228,0.021514893,0.0066490173,0.032928467,-0.015312195,-0.03302002,0.0011577606,-0.020202637,-0.016433716,-0.05001831,-0.03930664,0.03149414,-0.03265381,0.023468018,0.029342651,-0.09118652,-0.011894226,-0.054992676,0.004322052,-0.030136108,0.00076150894,-0.0046310425,0.025268555,-0.026123047,0.0012578964,-0.025039673,-0.023529053,-0.0033626556,0.034423828,-0.029647827,0.05392456,-0.002105713,0.03149414,0.018981934,0.016540527,0.041290283,0.03390503,0.007282257,-0.07678223,-0.09075928,-0.031951904,-0.0030879974,-0.022491455,-0.03652954,-0.005683899,-0.006134033,-0.072265625,-0.033569336,-0.019165039,-0.005077362,-0.02532959,0.006931305,-0.02760315,0.008323669,-0.0033817291,-0.053955078,-0.030349731,-0.016235352,0.06878662,0.028945923,0.023208618,0.044525146,-0.01739502,0.06402588,0.024856567,-0.022705078,-0.029724121,0.026184082,-0.018173218,0.011711121,0.0051193237,-0.0009675026,-0.025985718,0.033843994,0.062561035,0.019577026,-0.008552551,-0.012840271,-0.047698975,-0.031829834,-0.04244995,0.0064849854,0.015365601,0.017608643,0.039276123,-0.034118652,-0.04345703,-0.012802124,0.011795044,0.013648987,0.059020996,0.016494751,-0.0055274963,0.02571106,0.01977539,-0.045654297,0.027420044,0.027450562,0.0046653748,-0.023391724,-0.023895264,0.031463623,0.032196045,-0.024765015,0.011703491,-0.018081665,0.03112793,-0.01737976,0.010131836,0.030212402,-0.01586914,-0.02406311,-0.03491211,-0.010635376,0.030578613,-0.00013411045,-0.012336731,-0.036010742,-0.08459473,0.046325684,0.042541504,0.04373169,-0.0071258545,0.01965332,-0.02041626,-0.013931274,-0.06817627,0.042236328,0.06726074,-0.02029419,-0.011604309,0.015144348,-0.019165039,-0.031555176,-0.008560181,-0.006275177,-0.036102295,-0.02104187,0.019973755,-0.052764893,-0.009231567,-0.00040078163,0.026870728,0.05117798,-0.0011863708,-0.040496826,-0.022460938,-0.0036125183,0.0104522705,-0.028869629,-0.009857178,0.0057144165,0.011077881,0.034729004,-0.0035991669,0.02255249,-0.01109314,0.011505127,-0.000667572,0.009567261,-0.024765015,-0.021575928,0.016616821,-0.016601562,-0.070373535,0.0041389465,-0.014953613,0.07537842,-0.053710938,0.037872314,-0.0028133392,0.015052795,0.0552063,-0.010047913,-0.055511475,0.024520874,0.019104004,0.024978638,0.03933716,-0.0013208389,-0.03543091,-0.01586914,0.058166504,-0.009986877,-0.01071167,0.023895264,0.0055503845,0.030212402,0.012229919,-0.054473877,-0.018875122,-0.0042381287,-0.025680542,0.01676941,-0.013504028,0.019927979,-0.014717102,-0.00035476685,-0.02204895,-0.0015077591,-0.029693604,0.021102905,-0.019821167,0.0048294067,-0.013122559,-0.006580353,0.0184021,0.011398315,-0.018218994,-0.0006303787,0.032958984,0.029205322,-0.026473999,-0.02734375,-0.020965576,-0.006996155,0.0039405823,0.023803711,0.022216797,0.017227173,0.04144287,-0.037872314,0.02381897,0.031799316,0.0211792,0.043518066,-0.000008583069,0.016021729,-0.0680542,-0.05303955,-0.02381897,-0.035583496,0.03164673,0.025268555,0.0017557144,0.057006836,0.013519287,-0.013877869,-0.043518066,0.02458191,-0.04623413,-0.0037517548,0.038482666,-0.009307861,-0.022567749,-0.009712219,0.0037670135,-0.00022375584,0.03778076,0.008598328,0.014305115,0.062438965,0.047058105,-0.000166893,0.017288208,-0.0026073456,0.033111572,0.007255554,-0.019607544,-0.028167725,-0.007785797,0.012039185,-0.016693115,-0.0138168335,-0.07745361,0.05630493,0.050323486,0.07336426,0.024887085,0.008399963,0.035827637,-0.0236969,0.0022830963,-0.024124146,-0.008735657,-0.02041626,-0.029907227,0.016311646,-0.016983032,-0.0073394775,-0.013893127,0.02796936,0.0012321472,0.020645142,-0.03286743,0.05230713,0.009170532,-0.0071144104,0.02381897,0.007217407,0.043151855,0.06173706,-0.04058838,0.040283203,0.021148682,-0.0335083,0.0127334595,0.047729492,-0.026626587,-0.0060806274,-0.056549072,-0.019317627,-0.0038051605,0.0033569336,-0.0552063,-0.0053520203,-0.009963989,0.01979065,0.03479004,-0.017089844,-0.027572632,-0.01651001,-0.010398865,-0.056121826,-0.02180481,-0.036254883,0.01461792,0.04763794,-0.012374878,-0.010879517,0.015670776,-0.007419586,-0.012588501,0.0021343231,0.018829346,-0.011039734,-0.03994751,0.038238525,0.0178833,0.03353882,0.0135269165,0.03717041,0.023971558,0.026901245,0.042022705,0.007411957,-0.018600464,-0.0647583,0.0118637085,-0.055877686,0.00592041,0.01309967,-0.01838684,-0.00497818,-0.0118255615,-0.029800415,-0.028915405,0.01260376,-0.030349731,0.023651123,0.016494751,-0.030090332,-0.03643799,-0.05215454,-0.021133423,-0.00217247,0.061462402,0.030136108,-0.00007981062,-0.047821045,-0.012374878,0.03778076,0.0057411194,0.018432617,-0.014282227,-0.025238037,-0.014656067,-0.032928467,-0.0036029816,-0.015045166,0.018051147,-0.0017385483,-0.009063721,0.029159546,0.0076522827,0.02760315,-0.0044517517,0.018508911,0.03845215,-0.02835083,-0.0017995834,-0.015007019,0.042144775,0.00730896,-0.021316528,-0.04147339,0.043670654,0.022140503,0.030273438,-0.030090332,-0.0030384064,-0.0008664131,0.018615723,0.018417358,-0.015548706,-0.017868042,-0.00010997057,-0.053253174,-0.077819824,0.033203125,-0.031829834,0.03668213,0.010803223,0.014923096,0.018371582,-0.004825592,0.005958557,0.028823853,-0.030181885,-0.015655518,-0.03161621,-0.03149414,-0.013946533,-0.006137848,-0.016098022,0.02444458,-0.017562866,0.006629944,0.0023117065,-0.023269653,0.02470398,0.0009946823,0.0030517578,0.029571533,-0.0063438416,0.020629883,0.04220581,0.0043525696,-0.042999268,0.0206604,0.0018281937,0.009490967,-0.013763428,0.042114258,0.032348633,-0.005821228,-0.004749298,-0.004184723,-0.0046806335,-0.022460938,-0.000097990036,0.0006041527,0.013557434,-0.012519836,-0.047546387,0.020614624,0.011421204,-0.03778076,-0.0184021,0.02180481,0.007484436,-0.032165527,0.01737976,0.02368164,0.049591064,-0.021194458,0.011383057,0.016677856,0.023468018,0.031173706,0.019897461,-0.015304565,0.016860962,-0.0009675026,0.022064209,0.0068244934,-0.0104522705,0.01852417,0.0048179626,0.028305054,0.025787354,0.00970459,-0.021896362,-0.02861023,0.004322052,-0.007507324,-0.018157959,0.018585205,0.021484375,0.022781372,-0.01878357,0.017181396,0.009231567,-0.016921997,-0.029846191,-0.0062026978,0.03314209,-0.018295288,-0.028411865,0.022964478,0.0019016266,0.024475098,-0.051879883,-0.0050086975,-0.00070381165,0.02330017,-0.028274536,-0.0446167,-0.04046631,0.012504578,0.026794434,0.014541626,0.029907227,0.031036377,-0.012680054,-0.0033721924,0.029800415,0.00699234,-0.0066604614,-0.018112183,-0.04864502,-0.007675171,-0.0059509277,-0.0051078796,-0.03189087,0.007965088,-0.009315491,-0.033691406,0.0021324158,-0.009117126,-0.007411957,-0.011993408,0.011764526,0.02645874,0.0050201416,0.0052757263,-0.021408081,-0.025558472,0.00970459,0.0070495605,0.013801575,-0.053588867,0.010887146,-0.01965332,0.002210617,-0.004776001,0.026779175,0.028427124,0.026748657,0.0049476624,0.02154541,-0.052490234,0.02809143,-0.01725769,0.028762817,0.014564514,-0.04260254,-0.009262085,-0.026794434,-0.009407043,0.040771484,-0.017730713,-0.015174866,-0.028167725,-0.03640747,-0.01234436,-0.055664062,0.017074585,0.03378296,0.03555298,-0.02822876,0.0014123917,-0.007835388,-0.00017857552,-0.011184692,0.0059432983,-0.008003235,0.015342712,0.028381348,0.0154418945,-0.034942627,-0.02381897,-0.020828247,-0.01878357,-0.04168701,-0.04397583,-0.025115967,0.007205963,-0.0031642914,-0.00011700392,-0.033721924,-0.01499176,-0.003255844,-0.041534424,0.009117126,0.01398468,0.01348114,0.011993408,-0.018829346,0.0033893585,0.013130188,-0.013824463,0.033477783,0.015068054,-0.013687134,-0.038757324,0.007461548,0.0231781,0.025421143,0.00046038628,-0.011512756,-0.009597778,-0.015808105,-0.06085205,-0.006401062,-0.0029525757,0.004306793,-0.0051116943,-0.0039711,-0.048217773,-0.0007095337,-0.014251709,0.006504059,0.020690918,0.016174316,0.020843506,-0.0012741089,0.017166138,-0.006126404,-0.015670776,-0.028656006,0.03387451,0.010383606,0.0033473969,0.02722168,0.045776367,0.0072631836,-0.008888245,0.010902405,0.014541626,0.009246826,-0.029754639,0.008285522,-0.0074310303,0.013183594,-0.011306763,-0.015266418,-0.036193848,-0.0039787292,0.08380127,-0.011428833,-0.001250267,-0.0149002075,-0.020980835,0.018554688,0.026382446,-0.043670654,-0.0025405884,-0.030731201,0.015106201,-0.017150879,0.02003479,0.0053977966,0.026473999,-0.026107788,-0.05545044,-0.01335907,0.004760742,-0.013198853,-0.0670166,-0.020446777,-0.0619812,-0.007335663,-0.010002136,-0.028747559,0.011817932,0.01576233,-0.015014648,-0.082214355,0.004436493,0.044799805,0.0012998581,0.026672363,-0.011619568,0.007820129,0.030349731,-0.024597168,-0.017105103,0.038513184,-0.025512695,-0.01348114,-0.029006958,0.020874023,-0.005958557,-0.026794434,0.0259552,-0.00057172775,0.012107849,-0.0043907166,0.013519287,-0.0034275055,0.017410278,-0.015388489,0.035980225,-0.013839722,-0.0131073,0.031402588,-0.03930664,0.013137817,0.02494812,-0.0047416687,-0.001786232,0.02798462,0.039031982,-0.04510498,-0.00008839369,0.02243042,0.01676941,0.047454834,-0.030807495,0.037963867,0.018997192,-0.017318726,0.017623901,-0.0063476562,-0.026672363,-0.039123535,-0.033325195,0.031204224,-0.0057640076,0.02458191,-0.020950317,0.013824463,0.02331543,-0.001572609,0.0037517548,-0.012321472,-0.021575928,-0.015686035,-0.0049552917,-0.013168335,0.00022673607,-0.00074338913,0.03149414,0.010223389,0.03741455,0.016677856,-0.013931274,0.0076828003,0.018997192,-0.023544312,0.0024642944,0.022903442,-0.0009160042,0.01084137,0.014190674,0.016296387,-0.036193848,-0.008430481,-0.01991272,-0.004802704,0.00932312,-0.0026493073,-0.01838684,-0.005924225,-0.006061554,-0.0030155182,-0.038482666,0.011543274,-0.027633667,-0.030273438,-0.004337311,-0.019226074,0.016998291,0.018051147,0.0079956055,0.018463135,-0.00056123734,0.038970947,0.0048980713,-0.015014648,0.027893066,0.029312134,0.018295288,-0.033050537,-0.0032291412,-0.008636475,0.00056934357,0.0057678223,-0.029281616,0.008514404,0.044647217,-0.015380859,0.007926941,0.007534027,0.020370483,-0.010292053,0.012672424,-0.0025844574,0.016952515,-0.002714157,0.027786255,-0.054840088,0.0071983337,0.012748718,0.0036697388,-0.01525116,-0.026275635,-0.022338867,0.011947632,0.0035209656,-0.012687683,0.049591064,-0.008331299,0.028564453,-0.027191162,-0.0067329407,0.009063721,-0.03062439,-0.018951416,0.043670654,0.0064201355,0.0022182465,0.019561768,-0.032318115,0.03387451,-0.026855469,0.012001038,0.0005350113,0.007926941,-0.018630981,-0.024520874,-0.016708374,-0.008766174,-0.00340271,-0.0088272095,0.00258255,0.046447754,0.006954193,0.037109375,0.03894043,0.012336731,0.009635925,-0.036132812,-0.026641846,0.004638672,-0.021347046,0.025436401,-0.016281128,0.046081543,0.049468994,-0.0015544891,0.04135132,0.0368042,0.03189087,0.008491516,0.014457703,-0.0084991455,0.006416321,-0.015197754,0.016586304,0.016174316,0.050109863,-0.024749756,0.029083252,0.01789856,0.027526855,-0.020248413,0.042266846,0.06341553,0.01663208,-0.00466156,0.030807495,-0.0010681152,-0.008255005,-0.010856628,-0.015434265,0.062683105,0.010154724,0.057678223,0.044891357,0.013061523,-0.00969696,0.018341064,-0.031219482,-0.031707764,0.06549072,0.025253296,-0.022460938,-0.0022563934,-0.00919342,0.00015079975,-0.05593872,-0.047607422,0.018173218,-0.014976501,0.017745972,-0.010032654,0.0079574585,-0.014526367,0.027648926,0.016326904,0.020751953,-0.012466431,0.03491211,0.026062012,0.00730896,0.018371582,-0.008003235,0.03567505,-0.023529053,-0.012359619,0.011306763,0.014846802,-0.00484848,-0.008560181,0.021697998,0.0058250427,0.057006836,0.047302246,-0.019973755,0.012870789,0.03439331,0.013519287,-0.00005441904,0.055358887,0.027008057,0.01020813,0.043670654,0.04055786,0.03149414,-0.028121948,0.01713562,-0.0014123917,0.0023384094,-0.009849548,-0.0074386597,0.0023384094,-0.010749817,0.01234436,-0.0013046265,-0.01676941,0.01701355,0.033721924,-0.0028896332,0.0058059692,-0.0126571655,0.011482239,-0.016433716,-0.0031967163,0.018951416,-0.013946533,0.040039062,0.010574341,0.040527344,-0.013916016,0.028915405,-0.0066490173,-0.01663208,0.0002603531,0.03253174,-0.03125,0.016357422,-0.0008764267,-0.004814148,-0.05407715,0.017364502,0.023986816,-0.019332886,0.02418518,0.0019369125,-0.003025055,0.016540527,0.025421143,0.004787445,-0.0045166016,-0.005256653,-0.01864624,0.043060303,0.045928955,0.011543274,0.012413025,-0.016860962,-0.0038051605,0.0064926147,-0.00010639429,-0.01222229,-0.027908325,-0.020370483,-0.03881836,0.010887146,0.04067993,0.02041626,0.037628174,-0.006893158,-0.010177612,0.0045394897,0.029800415,0.0067443848,-0.004512787,-0.0107421875,0.03225708,-0.012992859,0.054107666,0.045196533,0.0063972473,0.036987305,-0.012611389,-0.032348633,0.0032157898,-0.00459671,0.028320312,-0.012886047,0.014755249,-0.0068092346,0.029159546,-0.018737793,-0.039733887,0.012687683,-0.016784668,-0.021316528,-0.02909851,0.003868103,0.008850098,0.03062439,0.03817749,0.016342163,-0.029678345,0.061553955,-0.015853882,0.042816162,-0.011482239,0.0013084412,0.044799805,0.028198242,0.040985107,0.020019531,0.023757935,-0.041412354,0.020370483,0.040924072,0.017913818,0.01398468,0.0022296906,-0.006668091,0.038238525,0.005634308,0.027633667,-0.015945435,-0.00818634,0.016098022,-0.005012512,0.0062294006,0.0043640137,-0.010444641,0.011779785,0.03692627,-0.025527954,-0.006603241,-0.022232056,-0.009414673,0.040985107,-0.00081014633,-0.0042266846,-0.006149292,-0.024932861,0.013656616,-0.03668213,-0.015602112,-0.0023937225,0.029953003,-0.040130615,-0.012908936,0.0051498413,0.008811951,-0.01638794,0.023788452,0.026428223,0.0026741028,0.009780884,0.04611206,-0.0105896,0.037078857,-0.012504578,0.014030457,0.031829834,0.0004143715,-0.0211792,0.0050811768,0.007358551,-0.024215698,0.014862061,0.033721924,-0.011062622,0.0013885498,-0.010154724,-0.018920898,0.0044136047,0.0016641617,-0.011230469,-0.00009983778,-0.017944336,-0.018112183,0.0004887581,0.0046806335,0.0020122528,0.007293701,-0.017288208,-0.01398468,0.019302368,0.047180176,0.024398804,-0.045654297,0.007888794,0.0026817322,0.010635376,-0.02545166,-0.014877319,-0.008094788,-0.02279663,0.015571594,0.0072631836,0.0035381317,0.014717102,-0.018615723,0.0029640198,0.026977539,0.009780884,0.022338867,0.010101318,-0.002571106,0.022109985,-0.010681152,-0.009414673,-0.0048675537,-0.014282227,0.007633209,0.017105103,-0.004589081,-0.03387451,0.03326416,-0.011390686,0.020935059,0.0039596558,-0.014007568,0.024856567,-0.022735596,-0.0074691772,0.00182724,0.01663208,-0.0045661926,-0.011627197,-0.01574707,0.02746582,0.053253174,-0.017990112,-0.011482239,0.026535034,0.015602112,0.023880005,0.030685425,0.014305115,0.042541504,0.030029297,-0.019104004,-0.01676941,0.016540527,-0.005748749,-0.020202637,0.016052246,-0.0024662018,-0.014564514,0.023086548,0.012161255,-0.003917694,-0.019851685,-0.025680542,-0.013946533,-0.020767212,0.011695862,-0.017333984,0.015899658,-0.01914978,-0.0065193176,-0.010986328,-0.021194458,-0.03955078,-0.018295288,0.0023727417,-0.016418457,-0.049224854,0.0041542053,-0.03186035,0.017028809,-0.022506714,-0.011299133,-0.017623901,0.028579712,-0.011512756,-0.002161026,0.0029411316,0.019104004,0.016433716,0.0069084167,0.02357483,-0.024780273,-0.031921387,-0.0178833,-0.008277893,-0.0076828003,0.024978638,0.0026493073,0.040374756,0.020263672,0.0030765533,0.0013751984,-0.0035476685,-0.01424408,-0.0028648376,-0.03149414,-0.010368347,0.016159058,0.005191803,-0.0032844543,-0.010147095,0.038360596,-0.018157959,-0.013015747,0.029541016,0.04699707,0.0059432983,0.027832031,-0.014823914,-0.0069732666,-0.006816864,0.0040283203,-0.019058228,0.008842468,0.009750366,0.0079193115,-0.0036468506,-0.0033912659,0.024673462,-0.008514404,-0.0029029846,0.022491455,-0.0071525574,-0.012161255,0.032318115,0.0128479,0.0063323975,-0.012054443,-0.009529114,0.026367188,0.044067383,0.016967773,0.006385803,-0.0008020401,0.0049552917,-0.021850586,0.0030727386,0.029159546,-0.016738892,-0.033996582,-0.0042648315,-0.042297363,0.020202637,-0.00057792664,0.013053894,-0.005680084,0.012702942,-0.018722534,-0.034606934,-0.012565613,0.022598267,0.020233154,-0.011024475,-0.00995636,-0.003730774,0.011444092,-0.026046753,0.007827759,-0.03353882,-0.029846191,-0.007820129,-0.0211792,0.01020813,0.0073661804,-0.010169983,-0.0020828247,0.0006284714,0.0005569458,-0.006340027,0.027679443,-0.018814087,-0.0030460358,0.026382446,0.01676941,-0.02822876,0.017654419,-0.018478394,-0.010284424,0.020736694,-0.0082473755,0.0134887695,-0.012687683,0.036254883,0.000095427036,-0.0076904297,0.022857666,-0.0027275085,0.015960693,-0.028305054,0.0040740967,0.0022335052,0.004085541,0.03375244,-0.026107788,-0.028060913,0.012176514,-0.02017212,-0.041046143,-0.004207611,0.023132324,0.031921387,-0.020080566,0.04095459,-0.0058250427,-0.014953613,0.011207581,0.0047950745,-0.018753052,0.005077362,0.037994385,0.0026111603,-0.0065841675,-0.0035800934,-0.010253906,-0.031677246,-0.011184692,0.0032253265,0.0021133423,-0.007293701,0.03161621,0.0025520325,0.044891357,0.00057697296,0.028869629,0.004081726,0.0044784546,0.025497437,0.010406494,0.036834717,-0.0016527176,-0.029174805,0.01777649,0.0016670227,-0.018875122,-0.006225586,-0.007270813,-0.00248909,-0.034454346,0.027313232,-0.00020670891,0.031341553,-0.012367249,0.011924744,-0.029129028,0.00038146973,-0.032684326,-0.014862061,-0.02067566,0.01033783,0.026870728,-0.0046310425,0.02229309,0.011657715,-0.024215698,0.020111084,0.040649414,0.005252838,-0.027389526,-0.01777649,0.011169434,0.011230469,0.011421204,0.008888245,-0.017196655,-0.02178955,-0.004501343,-0.0113220215,0.0118255615,-0.0014753342,0.0115737915,0.008613586,-0.0004720688,0.013267517,0.036376953,-0.010467529,0.00015866756,0.008598328,0.00762558,0.03604126,0.032409668,-0.008598328,0.026123047,0.022094727,-0.038269043,0.046447754,-0.010559082,0.026306152,-0.015144348,0.0014572144,-0.04360962,-0.024734497,-0.020111084,0.009529114],"createdAt":"2026-04-18T18:33:58.718Z","updatedAt":"2026-04-22T15:00:31.670Z","lastSeenAt":"2026-04-22T15:00:31.670Z","tsv":"'/api/endpoint-57':36,103,228 '0.02':12,28,86,142,145,214 '000':139 '20':138 'Base network API' 'USDC micropayment API' 'accept':127 'access':66,108 'advertis':83 'ai/ml':56 'analysi':196 'analyt':55 'api':6,22,52,91,107,174 'application/json':155 'avail':236 'base':9,25,74,140,148 'base-network' 'beyond':116 'broader':190 'call':4,20 'challeng':122 'classif':199 'coin':80 'collect':46 'commit':99 'confirm':123 'connect':182 'content':188 'convers':207 'correspond':226 'crawl':169 'data':54 'detail':159 'doc':172 'document':115,161,234 'embed':200 'endpoint':7,23,34,64,102,193 'exact':111 'exampl':164 'exchang':203 'feed':202 'financ':58 'flat':85 'found':166 'function':112 'generat':209 'generic':118 'geocod':205 'howev':217 'i.e':144 'infer':57 'infrastructur':61 'input/output':160 'json-response' 'key':92 'label':105 'limit':95 'list':192 'live':126 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':41 'materi':170 'mime':152 'minimum':98 'network':75,149 'offer':44 'openapi':157 'page':177 'paramet':233 'part':38 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payment':70,134 'per':3,13,19,29,50,87 'platform':42,82,191 'point':216 'post':128 'post-method' 'premium':5,21,106 'premium API access' 'price':173,201,215 'prompt':184 'protocol':71 'rate':94,204 'readm':176 'request':14,30,51,88,129 'requir':131 'respons':151 'return':179 'rout':240 'schema':158,231 'sentiment':195 'settl':76 'span':53 'specif':101,239 'substant':187 'summar':198 'text':197 'titl':119 'type':153 'unclear':220 'unit':141 'usag':163 'usd':79 'usdc':16,32,78,133,143 'usdc-settlement' 'util':62 'valid':206 'via':10,26,67 'wallet':183 'web3':59 'x402':11,27,69,121 'x402 API' 'x402-payment'","prices":[{"id":"28569ee7-4ae8-4584-9804-4c443137214f","listingId":"1ba09d78-367b-462a-b4f7-16ec4d5e7866","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/endpoint-57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:58.718Z"}],"sources":[{"listingId":"1ba09d78-367b-462a-b4f7-16ec4d5e7866","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:58.718Z","lastSeenAt":"2026-04-22T15:00:31.670Z"}],"details":{"listingId":"1ba09d78-367b-462a-b4f7-16ec4d5e7866","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $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 confirms the endpoint is live, accepts POST, and requires up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-57"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-57"},{"claim":"The platform lists endpoints for analytics, AI/ML, finance, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Users who want no-signup, no-API-key access to paid endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:18:41.838Z"},"updatedAt":"2026-04-22T15:00:31.670Z"}}