{"id":"9cc280a1-76cf-48e2-8794-ad7054bebd4a","shortId":"PqsANM","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required. The specific endpoint at `/api/v1/charges/177` is labeled \"Premium API Access\" and accepts x402 payments.\n\nThe platform advertises a flat $0.02 per request across its listed endpoints. The probed endpoint's x402 challenge shows a maxAmountRequired of 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The site lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind `/api/v1/charges/177` (\"Premium API Access\") is not described beyond its title, so it is unclear what data or service it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limits","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/charges/177 ('Premium API Access') is not documented anywhere","No request or response examples available to verify actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/177","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/charges/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of this 'Premium API Access' endpoint is entirely undescribed. The docs/pricing/API pages are all empty beyond a wallet connect prompt.","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":"2026-04-19T03:24:09.502Z","embedding":[-0.021316528,-0.042816162,0.037872314,0.02357483,0.017181396,-0.02633667,-0.027160645,0.0345459,0.06854248,-0.05645752,0.032562256,-0.051361084,-0.029663086,-0.027297974,-0.018508911,0.015701294,-0.004878998,0.011413574,-0.04043579,0.044403076,0.0236969,-0.012901306,-0.01763916,0.02482605,-0.0038928986,-0.02128601,-0.006000519,-0.008117676,-0.014167786,-0.024841309,0.03277588,-0.025009155,-0.0063667297,0.012504578,-0.013755798,-0.013687134,-0.01486969,0.027404785,0.02444458,-0.003419876,-0.004951477,-0.06011963,0.00907135,-0.013755798,-0.062927246,-0.011459351,0.0103302,-0.014526367,-0.0037765503,0.011497498,-0.03253174,-0.0076141357,-0.0077590942,0.001420021,0.003929138,0.00730896,-0.0043258667,-0.006385803,0.007888794,0.002872467,-0.008544922,-0.068115234,-0.019500732,0.0030097961,-0.0037975311,0.04827881,-0.0069503784,0.042785645,-0.0005874634,0.066101074,0.04144287,0.040161133,0.034820557,0.00020551682,0.0043296814,-0.0019445419,-0.002576828,0.058776855,-0.010444641,-0.012283325,-0.01637268,-0.008033752,-0.049987793,-0.0048675537,-0.0118255615,-0.04336548,-0.022735596,0.024459839,-0.03479004,0.020385742,-0.0703125,-0.0030174255,-0.017303467,-0.009284973,0.0107421875,0.006198883,-0.0077056885,0.028945923,-0.00655365,0.018661499,0.00040721893,-0.03805542,0.012359619,0.012886047,0.038360596,0.047607422,0.035186768,0.0178833,0.0010690689,-0.0050201416,-0.020721436,0.015571594,-0.017486572,-0.013374329,0.014099121,0.005027771,-0.02229309,0.02923584,-0.034454346,0.018600464,-0.047210693,0.04547119,0.0209198,-0.0019311905,0.016479492,-0.043121338,-0.014656067,0.02079773,-0.027862549,-0.0070495605,0.012954712,0.010810852,0.04043579,-0.019989014,-0.03173828,0.004627228,-0.02268982,-0.012763977,-0.052124023,-0.04034424,0.03793335,-0.025283813,0.033203125,0.043670654,-0.10101318,-0.012428284,-0.04083252,0.01309967,-0.029159546,-0.0069770813,-0.0066871643,0.027618408,-0.02029419,-0.022415161,-0.018936157,-0.019943237,-0.01020813,0.04574585,-0.016921997,0.045532227,-0.012924194,0.025421143,0.005393982,-0.000562191,0.014152527,0.02456665,-0.0034828186,-0.07745361,-0.08508301,-0.02798462,-0.017700195,-0.022842407,-0.02684021,-0.0062713623,-0.0020332336,-0.07952881,-0.012237549,-0.023025513,-0.0007247925,-0.034057617,0.0029640198,-0.03326416,0.012878418,-0.007835388,-0.06518555,-0.02357483,-0.019515991,0.06500244,0.024520874,0.026535034,0.028381348,-0.017471313,0.070617676,0.027267456,-0.031951904,-0.014633179,0.020812988,-0.01713562,0.014297485,-0.0099105835,0.006160736,-0.02507019,0.034210205,0.06286621,0.008171082,-0.025848389,-0.011024475,-0.059753418,-0.048095703,-0.032989502,0.017684937,-0.0005507469,-0.005680084,0.038757324,-0.035095215,-0.037872314,-0.004753113,0.0115737915,0.009315491,0.057037354,0.012939453,-0.009376526,0.02319336,0.015083313,-0.0635376,0.042907715,0.034301758,0.008621216,-0.020446777,-0.036590576,0.021865845,0.026763916,-0.032470703,0.024307251,-0.022384644,0.016906738,0.003162384,0.01524353,0.014884949,-0.013442993,-0.030426025,-0.020614624,-0.004928589,0.032287598,0.014274597,-0.035217285,-0.03488159,-0.0793457,0.050811768,0.0345459,0.038238525,0.0072631836,0.023971558,-0.019943237,-0.017547607,-0.07220459,0.06341553,0.08050537,0.00894928,-0.024353027,0.019424438,-0.016052246,-0.028045654,0.0026474,-0.011520386,-0.032958984,-0.021469116,0.010375977,-0.052520752,0.00025987625,0.02331543,0.01737976,0.05038452,-0.013259888,-0.059051514,-0.025497437,0.0005750656,0.00021159649,-0.026809692,-0.0074272156,-0.011169434,0.02394104,0.016998291,-0.0035152435,0.018630981,-0.008605957,0.012619019,-0.008323669,-0.0025634766,-0.009033203,-0.015777588,0.0021362305,0.0035514832,-0.06384277,0.009498596,-0.003522873,0.07537842,-0.04425049,0.050628662,0.0009417534,0.018844604,0.064575195,-0.0037899017,-0.049224854,0.010810852,0.031463623,0.018539429,0.043304443,0.013397217,-0.025054932,-0.011955261,0.07989502,0.004348755,0.0018024445,0.0075798035,0.0005426407,0.036621094,-0.0006594658,-0.06750488,-0.04067993,-0.009651184,-0.03414917,0.025421143,-0.028381348,0.018310547,-0.013633728,0.009399414,-0.012893677,0.0037975311,-0.030960083,0.010284424,-0.012611389,0.013877869,-0.024337769,-0.01651001,0.011383057,0.010826111,-0.009979248,0.014762878,0.046295166,0.03277588,-0.014831543,-0.036376953,-0.031555176,-0.0017032623,0.0027065277,0.014549255,0.017837524,0.028198242,0.050933838,-0.04348755,0.009757996,0.020812988,0.0077934265,0.04626465,-0.011238098,0.0017175674,-0.056732178,-0.046844482,-0.030426025,-0.03074646,0.028549194,0.025405884,0.0005970001,0.051757812,0.0024814606,-0.019836426,-0.027252197,0.025482178,-0.04751587,-0.001200676,0.0390625,-0.012260437,-0.04421997,0.003545761,0.0057258606,-0.004009247,0.039520264,0.012367249,0.01725769,0.06604004,0.037475586,0.0063667297,0.025360107,0.008590698,0.019714355,0.009757996,-0.031555176,-0.024475098,-0.013572693,0.038848877,-0.026168823,-0.022476196,-0.063964844,0.052459717,0.037231445,0.08648682,0.03125,0.0067825317,0.027755737,-0.01222229,0.012084961,-0.022354126,-0.016113281,-0.029312134,-0.055145264,0.027908325,-0.017089844,-0.007972717,-0.028686523,0.059326172,-0.0005412102,0.021713257,-0.031433105,0.043395996,-0.006965637,-0.009498596,0.023330688,0.009742737,0.05050659,0.06518555,-0.052459717,0.023025513,0.026229858,-0.031982422,-0.0019779205,0.0569458,-0.006126404,-0.00894928,-0.06555176,-0.022216797,0.00044322014,-0.0065727234,-0.053131104,0.003993988,0.006931305,0.014183044,0.02923584,-0.007522583,-0.020126343,-0.0061187744,-0.022827148,-0.0524292,-0.00705719,-0.0440979,0.0056037903,0.04348755,-0.022903442,-0.007888794,-0.005748749,-0.01386261,-0.0036411285,0.0071640015,0.02507019,-0.008651733,-0.058746338,0.040161133,0.01033783,0.006576538,0.009887695,0.03704834,0.03225708,0.020614624,0.05218506,0.00856781,-0.022888184,-0.06719971,0.029418945,-0.041412354,-0.0008368492,0.019515991,-0.022918701,-0.0015678406,-0.009765625,-0.03302002,-0.026870728,0.008117676,-0.028579712,0.00970459,0.023651123,-0.018753052,-0.024673462,-0.05050659,-0.016174316,-0.0030231476,0.07086182,0.019546509,-0.0020256042,-0.06121826,-0.0052375793,0.01739502,0.009094238,0.025436401,-0.015029907,-0.014694214,-0.011947632,-0.037384033,-0.0049552917,-0.022094727,0.011291504,-0.012458801,-0.0030021667,0.021972656,0.003358841,0.016662598,-0.0049362183,0.013809204,0.036743164,-0.030776978,-0.00092458725,-0.02420044,0.036132812,0.0079956055,0.0033836365,-0.05114746,0.04324341,0.01789856,0.03338623,-0.041534424,0.0062828064,-0.0065231323,0.0058403015,0.022735596,-0.0011758804,-0.00843811,-0.012207031,-0.04815674,-0.06964111,0.03817749,-0.024520874,0.029342651,0.009513855,0.00491333,0.023605347,-0.01108551,-0.004447937,0.021469116,-0.02444458,-0.004005432,-0.017089844,-0.029266357,-0.011795044,-0.011543274,-0.027511597,0.029373169,-0.010520935,0.025894165,-0.0036354065,-0.024780273,0.022140503,0.0012140274,-0.0068969727,0.027648926,-0.00025177002,0.020339966,0.05026245,0.013542175,-0.04434204,0.027191162,0.00137043,0.011665344,-0.015731812,0.039398193,0.026489258,-0.0062828064,-0.014038086,-0.016098022,-0.013771057,-0.02128601,0.010177612,0.017303467,0.011520386,-0.008583069,-0.039093018,0.015731812,0.0033950806,-0.03656006,-0.012954712,0.015045166,0.016815186,-0.030319214,0.019805908,0.02670288,0.062286377,-0.028579712,-0.00092601776,0.010047913,0.025802612,0.028579712,0.021728516,-0.011520386,0.01423645,-0.008796692,0.015335083,-0.013450623,-0.010925293,0.012031555,0.00006592274,0.023712158,0.024017334,0.011207581,-0.02368164,-0.02545166,0.012870789,-0.015777588,-0.023834229,0.024749756,0.018798828,0.01789856,-0.026657104,0.016998291,0.014045715,-0.022537231,-0.01902771,-0.0012178421,0.04345703,-0.021850586,-0.010093689,0.018539429,0.0096206665,0.029388428,-0.060638428,-0.004535675,0.0055618286,0.01247406,-0.023727417,-0.04647827,-0.035308838,0.022949219,0.029083252,0.004886627,0.022247314,0.038482666,0.00057315826,0.009132385,0.02130127,-0.005405426,-0.01512146,-0.006767273,-0.04888916,-0.015281677,-0.012832642,0.0022659302,-0.02947998,0.008766174,-0.012458801,-0.03414917,0.008239746,-0.010658264,-0.002779007,-0.006591797,0.011314392,0.04586792,0.0012807846,0.009979248,-0.016357422,-0.03552246,-0.0057678223,-0.0006275177,0.021270752,-0.043640137,0.010658264,-0.0113220215,-0.006023407,0.0046958923,0.007118225,0.01687622,0.021575928,0.008872986,0.033111572,-0.03451538,0.054595947,-0.0395813,0.022384644,0.014595032,-0.04748535,-0.009162903,-0.030349731,-0.011932373,0.032958984,-0.024841309,-0.0070762634,-0.021240234,-0.037475586,-0.012374878,-0.05343628,0.024536133,0.038391113,0.03881836,-0.02279663,-0.0010728836,0.006958008,0.0019483566,-0.01739502,0.004421234,-0.023666382,0.016067505,0.020751953,0.00349617,-0.023742676,-0.026428223,-0.020812988,0.0031661987,-0.044921875,-0.05239868,-0.010513306,-0.00022017956,-0.017288208,-0.00730896,-0.015960693,-0.027374268,-0.0034122467,-0.042938232,0.0079193115,0.0043792725,0.023391724,0.005306244,-0.023925781,0.0009279251,0.014045715,-0.019104004,0.027023315,0.0017356873,-0.006816864,-0.03378296,0.0060768127,0.029785156,0.014152527,-0.002040863,-0.009735107,-0.012023926,-0.014633179,-0.05038452,0.006111145,-0.005153656,-0.005683899,-0.0019168854,0.006046295,-0.04537964,-0.004699707,-0.020935059,0.0016555786,0.020355225,0.016677856,0.007434845,0.0005812645,0.017593384,-0.0024032593,-0.021057129,-0.027664185,0.021636963,0.011177063,0.005104065,0.023361206,0.0368042,0.0022220612,-0.016082764,-0.0002450943,0.014694214,0.02279663,-0.02558899,0.0018854141,-0.017837524,0.011413574,-0.01309967,-0.0040397644,-0.035339355,-0.005924225,0.0848999,0.0024719238,-0.011520386,-0.0064849854,-0.023361206,0.023284912,0.02949524,-0.045043945,-0.006340027,-0.04248047,0.01953125,-0.024291992,0.017166138,0.0010528564,0.017089844,-0.030456543,-0.06286621,-0.016555786,0.002199173,-0.016342163,-0.06378174,-0.017623901,-0.06512451,0.0038108826,-0.014801025,-0.012374878,0.0012454987,0.0045433044,-0.0234375,-0.08117676,0.007446289,0.05050659,0.0002348423,0.02168274,-0.01966858,0.018569946,0.025970459,-0.026016235,0.0043029785,0.02609253,-0.024993896,-0.015426636,-0.014076233,0.010871887,-0.010902405,-0.017791748,0.015197754,0.015213013,0.01096344,-0.006690979,0.014404297,-0.0042381287,0.024917603,-0.011444092,0.014640808,-0.018859863,-0.01259613,0.033081055,-0.041534424,0.02949524,0.01789856,-0.00907135,0.0047416687,0.02973938,0.043304443,-0.032592773,-0.030029297,0.022827148,0.01322937,0.034362793,-0.0317688,0.049346924,0.018310547,-0.016403198,0.014816284,-0.011329651,-0.024368286,-0.027572632,-0.03149414,0.026870728,0.018081665,0.010177612,-0.012069702,0.006038666,0.013755798,-0.008850098,0.0053138733,-0.016326904,-0.013298035,-0.014099121,-0.002779007,-0.002231598,0.004184723,-0.002122879,0.03024292,0.014961243,0.0289917,0.0057907104,-0.005634308,-0.006225586,0.02558899,-0.02130127,0.0015907288,0.021209717,0.017745972,0.027252197,0.01537323,0.010749817,-0.05041504,-0.011062622,-0.026763916,-0.012237549,0.0004696846,-0.016952515,-0.008270264,-0.008255005,0.005264282,-0.015991211,-0.032470703,0.004173279,-0.028778076,-0.023422241,0.004085541,-0.01020813,0.01751709,0.008506775,0.01033783,0.008460999,0.0011587143,0.049072266,-0.00082063675,-0.00349617,0.028884888,0.029266357,0.018875122,-0.029022217,-0.00868988,-0.009597778,-0.007587433,0.0050964355,-0.02772522,0.017028809,0.045440674,-0.016571045,0.017333984,0.0028457642,0.02798462,-0.006412506,0.0037765503,-0.016281128,0.014312744,-0.0017871857,0.023864746,-0.045166016,0.016983032,0.020431519,-0.0028305054,-0.018508911,-0.018951416,-0.012199402,0.016906738,0.01209259,-0.00548172,0.04525757,0.0049705505,0.018966675,-0.022857666,-0.009063721,0.014961243,-0.030960083,-0.013900757,0.030792236,-0.000002026558,0.00030303,0.014511108,-0.03173828,0.031951904,-0.044158936,0.013381958,0.008552551,0.004272461,-0.012252808,-0.011444092,-0.017745972,-0.004524231,-0.009284973,0.015014648,0.0012865067,0.045898438,0.013076782,0.039123535,0.056030273,0.023635864,-0.00042295456,-0.043518066,-0.030853271,-0.004020691,-0.027404785,0.016342163,-0.0043678284,0.03881836,0.028579712,0.0028152466,0.0390625,0.03982544,0.039794922,0.0068855286,0.014801025,-0.0154418945,0.010620117,0.00003504753,0.03010559,0.0011539459,0.037231445,-0.026138306,0.027542114,0.009628296,0.032958984,-0.021759033,0.02508545,0.076049805,0.015975952,-0.015533447,0.039520264,0.0000667572,-0.017196655,-0.006175995,-0.01663208,0.05493164,0.00894928,0.046051025,0.056396484,0.018737793,-0.006187439,0.018463135,-0.031463623,-0.027297974,0.064941406,0.02029419,-0.03010559,-0.011009216,-0.0013179779,0.0079956055,-0.047607422,-0.02128601,0.019622803,-0.000330925,0.0024032593,-0.012489319,-0.012054443,-0.023406982,0.0129776,0.021591187,0.018814087,-0.009155273,0.026779175,0.033203125,0.0029239655,0.027862549,-0.0035743713,0.02017212,-0.025878906,-0.024536133,0.01411438,0.01737976,-0.011566162,-0.00793457,0.024963379,-0.00013113022,0.04348755,0.035888672,-0.0184021,0.0062789917,0.03173828,0.020233154,-0.004760742,0.05444336,0.04660034,0.008735657,0.034484863,0.0368042,0.0368042,-0.036865234,0.019500732,0.0009651184,0.01096344,-0.000562191,-0.003545761,0.009429932,-0.015670776,0.016998291,-0.009361267,-0.013900757,0.02180481,0.029693604,-0.007217407,-0.01121521,-0.016174316,0.010505676,-0.020599365,-0.0042037964,0.004371643,-0.014404297,0.037017822,0.014816284,0.030883789,-0.023208618,0.021331787,0.000106453896,-0.017944336,-0.006210327,0.030883789,-0.03540039,0.002412796,-0.008804321,-0.0010957718,-0.044281006,0.007888794,0.029769897,-0.014137268,0.02003479,0.0078125,0.00036883354,-0.0068969727,0.026275635,0.013320923,-0.006790161,-0.005168915,-0.008621216,0.035980225,0.042419434,-0.0041389465,0.004875183,-0.02458191,-0.005355835,0.002948761,-0.004749298,-0.0034618378,-0.009681702,-0.023345947,-0.021942139,0.022766113,0.032562256,0.026672363,0.05090332,-0.016296387,-0.014961243,0.010154724,0.028778076,0.0054855347,0.003686905,0.0027656555,0.020095825,-0.012680054,0.04272461,0.02822876,0.012390137,0.036071777,-0.0068511963,-0.012023926,0.013442993,-0.020095825,0.031555176,-0.012069702,0.008880615,-0.016311646,0.020751953,-0.011451721,-0.027130127,0.008338928,-0.018585205,-0.028045654,-0.024124146,0.0082473755,0.004962921,0.03010559,0.03741455,0.02798462,-0.020965576,0.06201172,-0.0115356445,0.041992188,0.0020217896,-0.0018339157,0.04788208,0.02947998,0.029922485,0.029129028,0.01083374,-0.03704834,0.014205933,0.04071045,0.024032593,0.005470276,0.007369995,-0.0074157715,0.035888672,-0.0050849915,0.033203125,-0.013580322,0.0018320084,0.0062217712,-0.0014724731,-0.010505676,0.0018501282,-0.0027694702,0.0112838745,0.048736572,-0.019058228,-0.010536194,-0.02796936,-0.0035324097,0.02973938,-0.011772156,-0.000039577484,-0.0079422,-0.013542175,0.009498596,-0.026565552,-0.028015137,0.011146545,0.025848389,-0.0519104,-0.015670776,0.005809784,0.01638794,-0.02319336,0.032287598,0.019332886,-0.0082473755,0.003829956,0.04156494,-0.012168884,0.02407837,-0.009216309,0.030532837,0.033447266,0.011016846,-0.024032593,-0.0005912781,0.005897522,-0.017425537,0.014457703,0.035705566,-0.013938904,0.0055618286,-0.006717682,-0.013809204,0.0004992485,0.0032196045,-0.0152282715,0.014907837,-0.011390686,-0.005405426,-0.00016772747,0.014633179,-0.003358841,0.008178711,-0.018066406,-0.012191772,0.008110046,0.024307251,0.020339966,-0.03186035,0.00007736683,0.0023994446,0.012329102,-0.022918701,-0.014457703,-0.0073890686,-0.03125,0.019195557,0.018600464,0.008720398,0.012275696,-0.018600464,-0.005580902,0.028015137,-0.0007791519,0.020889282,0.010810852,-0.0027713776,0.011894226,-0.010108948,-0.008033752,0.0008482933,-0.007713318,0.006965637,0.013046265,0.002073288,-0.027618408,0.029449463,0.000787735,0.02003479,-0.005092621,-0.01763916,0.022323608,-0.01486969,-0.007865906,0.0066604614,0.013427734,-0.010421753,-0.012825012,-0.017303467,0.036102295,0.054382324,-0.00712204,-0.011421204,0.031311035,0.020111084,0.017532349,0.047668457,0.0087890625,0.043762207,0.021118164,-0.024856567,-0.01449585,0.02079773,-0.00052022934,-0.032165527,0.014183044,-0.0031261444,-0.00064086914,0.023544312,0.015655518,-0.0035820007,-0.025222778,-0.01309967,-0.010978699,-0.013137817,0.011161804,-0.013343811,0.022979736,-0.020736694,-0.010383606,0.010887146,-0.02897644,-0.056610107,-0.021606445,0.005683899,-0.007446289,-0.054138184,-0.005168915,-0.030136108,0.0076942444,-0.025741577,-0.00957489,-0.016189575,0.021331787,-0.017944336,-0.00038981438,0.010597229,0.018035889,0.021835327,0.0017795563,0.019561768,-0.033996582,-0.030700684,-0.02684021,0.00969696,-0.01890564,0.010154724,0.013534546,0.033294678,0.020477295,-0.007858276,-0.003376007,-0.007171631,-0.007904053,-0.005054474,-0.0236969,-0.020706177,0.025741577,0.01525116,-0.012680054,-0.015731812,0.035736084,-0.029586792,-0.0054893494,0.028182983,0.03793335,0.012161255,0.02180481,-0.018798828,-0.00062799454,-0.01789856,-0.0018320084,-0.02017212,0.00015759468,0.013053894,-0.0016736984,-0.0043144226,0.0038490295,0.016555786,-0.014007568,-0.010398865,0.035980225,0.0050201416,-0.021377563,0.035095215,0.011581421,0.00831604,-0.009994507,-0.013832092,0.025375366,0.050354004,0.0041503906,0.009590149,-0.0035972595,0.01260376,-0.011421204,0.012283325,0.01940918,-0.019058228,-0.04119873,-0.022460938,-0.031341553,0.017593384,0.0021572113,0.012001038,-0.0018558502,0.021865845,-0.02609253,-0.030166626,-0.02293396,0.026794434,0.0054626465,-0.009613037,-0.011062622,0.0115356445,0.017028809,-0.03643799,0.0049591064,-0.035125732,-0.027053833,-0.015777588,-0.024658203,0.019500732,0.010749817,-0.0013980865,-0.0036506653,-0.0032577515,-0.0010929108,-0.0003066063,0.035186768,-0.008895874,0.008903503,0.028366089,0.015975952,-0.024169922,0.021972656,-0.010757446,-0.0045547485,0.0073547363,-0.013191223,0.013023376,-0.01927185,0.028701782,-0.006729126,0.003627777,0.03933716,-0.0074424744,0.0072021484,-0.023849487,0.000042557716,-0.0012140274,-0.009346008,0.0440979,-0.024993896,-0.02507019,0.012992859,-0.021347046,-0.030715942,0.0035820007,0.020187378,0.036346436,-0.008087158,0.039611816,-0.014076233,-0.009429932,0.006690979,0.0016651154,-0.01586914,0.011161804,0.032440186,0.01537323,-0.0051841736,-0.005191803,-0.016189575,-0.0317688,-0.0017795563,0.016662598,0.0021266937,-0.011405945,0.03111267,0.015083313,0.05218506,-0.0037269592,0.018997192,0.012634277,-0.0035591125,0.02557373,0.0053596497,0.055145264,-0.007221222,-0.033203125,0.009788513,-0.008460999,-0.01826477,0.00024044514,-0.005004883,0.0038394928,-0.036071777,0.01625061,-0.008087158,0.031341553,-0.019500732,0.012901306,-0.02281189,0.0016155243,-0.03765869,-0.013786316,-0.03640747,0.019744873,0.039245605,0.0021305084,0.026992798,0.010887146,-0.017669678,0.025054932,0.05206299,-0.00894928,-0.030456543,-0.01108551,0.02078247,-0.0005402565,0.008232117,0.011802673,-0.007003784,-0.016555786,0.0044174194,-0.021728516,0.009391785,-0.007472992,0.020584106,0.007335663,0.0065460205,-0.003921509,0.03137207,-4.7683716e-7,-0.0006875992,0.012512207,0.0028133392,0.041900635,0.034179688,-0.018310547,0.02809143,0.009750366,-0.04525757,0.06222534,-0.00021779537,0.039215088,-0.020645142,0.008201599,-0.026763916,-0.025146484,-0.024902344,0.015777588],"createdAt":"2026-04-18T18:44:23.676Z","updatedAt":"2026-04-22T18:31:26.659Z","lastSeenAt":"2026-04-22T18:31:26.659Z","tsv":"'/api/v1/charges/177':83,209 '/request':13,28 '0.02':12,27,98,126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':121 '20000':115 '300':139 '6':130 'Base network API' 'USDC API' 'accept':90 'access':88,212 'across':45,101 'actual':206 'addit':188 'advertis':95 'ai-inference' 'ai/ml':48 'analysi':148 'analyt':47 'api':5,20,37,69,87,174,211 'base':8,23,65,116,123 'behind':208 'beyond':216 'call':4,19 'challeng':110 'classif':151 'commit':77 'connect':183 'content':189 'contract':120 'convers':159 'data':46,224 'data-analytics' 'decim':131 'describ':215 'detail':200 'doc':173 'document':168,201 'embed':152 'enabl':36 'endpoint':44,55,81,104,107,145,204 'equal':125 'exact':136 'exampl':197 'exchang':155 'extrem':170 'feed':154 'finance-data' 'finance/web3':50 'flat':97 'function':207 'geocod':157 'given':127 'infer':49 'infrastructur':52 'key':70 'label':85 'limit':73 'list':103,144 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':113 'micropayment API' 'minimum':76 'network':9,24,66 'no-api-key' 'no-rate-limits' 'offer':40 'openapi':193 'page':178 'paid':57 'pay':2,17 'pay per call API' 'pay-per-cal':1,16 'pay-per-request' 'payment':92,133 'per':3,18,59,99 'per-request':58 'platform':6,21,38,94 'point':167 'premium':86,210 'premium API access' 'price':153,166,175 'probe':106 'prompt':185 'rate':72,156 'readm':177 'render':180 'request':60,100 'request/response':196 'requir':78 'return':228 'schema':194 'scheme':134 'second':140 'sentiment':147 'servic':226 'show':111 'site':143 'spars':171 'specif':80 'summar':150 'text':149 'timeout':141 'titl':218 'unclear':222 'unit':117 'usdc':15,30,62,119,128 'usdc-base' 'use':61 'util':53 'utility-services' 'valid':158 'varieti':42 'via':10,25 'wallet':184 'web3-data' 'x402':11,26,35,91,109 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"72b225c5-b9fc-486f-857f-7440e39ce084","listingId":"9cc280a1-76cf-48e2-8794-ad7054bebd4a","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/charges/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:23.676Z"}],"sources":[{"listingId":"9cc280a1-76cf-48e2-8794-ad7054bebd4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/177","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:23.676Z","lastSeenAt":"2026-04-22T18:31:26.659Z"}],"details":{"listingId":"9cc280a1-76cf-48e2-8794-ad7054bebd4a","quickStartSnippet":"# POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/177 \\\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":"Flat pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/177"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/177"},{"claim":"Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Paying per-call for AI inference tasks like sentiment analysis or text summarization","Fetching financial data such as token quotes, exchange rates, or gas estimates","Utility operations like geocoding, validation, or data conversion"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers wanting low-friction API consumption via crypto micropayments","Use cases requiring no rate limits and instant access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods","High-volume use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.53Z"},"updatedAt":"2026-04-22T18:31:26.659Z"}}