{"id":"36561486-60ee-4662-beb6-f3d40939ba80","shortId":"6vq22J","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/323` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: 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.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/323` endpoint specifically returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality this particular route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"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/payments/323 ('Premium API Access') is not explained anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/323","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/323","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 402 challenge, confirming it accepts USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The purpose of the specific /api/v1/payments/323 route is undocumented, making this 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":"2026-04-19T07:07:46.472Z","embedding":[-0.03152466,-0.026992798,0.02720642,0.018508911,0.0038528442,-0.022354126,-0.0149002075,0.017929077,0.08013916,-0.0597229,0.022964478,-0.050201416,-0.043670654,-0.026428223,-0.023468018,0.0051078796,-0.0012664795,0.0018386841,-0.029541016,0.0262146,0.03302002,-0.006690979,-0.041534424,0.025222778,0.0027236938,-0.01499176,-0.007648468,-0.008422852,-0.025527954,-0.036621094,0.050628662,-0.027313232,-0.009933472,0.002122879,-0.01864624,-0.016052246,0.0037250519,0.030075073,0.029434204,0.001253128,-0.0020580292,-0.06222534,0.0052452087,-0.020523071,-0.06222534,-0.0035381317,0.0051651,-0.01876831,0.004146576,0.004016876,-0.03781128,-0.009300232,-0.01802063,0.010070801,0.006225586,0.009849548,-0.0036735535,-0.016281128,0.010215759,0.016342163,-0.0070724487,-0.054779053,-0.017974854,-0.008377075,0.0043563843,0.048583984,-0.010757446,0.03793335,0.0036640167,0.06542969,0.03765869,0.042877197,0.030044556,0.008720398,-0.00010973215,-0.0009803772,0.000084638596,0.057250977,-0.016052246,-0.02520752,-0.005962372,-0.0055885315,-0.055145264,-0.0009255409,-0.028564453,-0.042755127,-0.0236969,0.020385742,-0.016616821,0.03640747,-0.0715332,0.0064353943,-0.0068359375,-0.0024299622,0.002506256,-0.0104599,-0.011428833,0.030960083,-0.004337311,0.011383057,-0.0049591064,-0.042877197,0.016723633,0.0054855347,0.036865234,0.052947998,0.01966858,0.017089844,0.0066719055,-0.0067367554,-0.027633667,0.015167236,-0.0068206787,-0.01007843,0.0066223145,0.011650085,-0.014694214,0.013839722,-0.028015137,0.01826477,-0.052764893,0.05709839,0.008651733,0.0068359375,0.008148193,-0.046905518,-0.01133728,0.031707764,-0.03265381,-0.0053901672,0.020248413,0.0131073,0.026473999,-0.02331543,-0.0345459,0.018859863,-0.026351929,-0.007965088,-0.043823242,-0.028381348,0.036956787,-0.029678345,0.012001038,0.038238525,-0.095825195,-0.007282257,-0.045013428,0.012580872,-0.03274536,-0.011650085,0.0041770935,0.032470703,-0.006084442,-0.012069702,-0.028518677,-0.020645142,0.0030155182,0.038604736,-0.016693115,0.049591064,-0.023864746,0.0234375,0.022018433,0.014823914,0.012496948,0.023483276,-0.010345459,-0.09063721,-0.07965088,-0.018676758,0.0044670105,-0.017364502,-0.025177002,0.011352539,-0.0077667236,-0.058563232,-0.011245728,-0.011077881,0.005531311,-0.038513184,0.0015926361,-0.026275635,0.016067505,0.0032653809,-0.061462402,-0.0284729,-0.027709961,0.056243896,0.029968262,0.026428223,0.025177002,-0.01197052,0.060516357,0.024230957,-0.016616821,-0.01007843,0.025177002,-0.026550293,0.017364502,-0.012290955,0.009674072,-0.0345459,0.037109375,0.07397461,0.014060974,-0.02670288,-0.009597778,-0.061828613,-0.051971436,-0.04296875,0.017745972,0.0063209534,-0.006690979,0.032226562,-0.027862549,-0.02809143,0.005630493,0.022109985,0.023071289,0.06500244,0.012214661,-0.009490967,0.026626587,0.02104187,-0.05493164,0.043762207,0.03463745,0.00699234,-0.026641846,-0.03250122,0.031677246,0.046142578,-0.02406311,0.019058228,-0.00868988,0.016967773,-0.014915466,-0.004486084,0.013244629,-0.014572144,-0.018066406,-0.024520874,-0.036987305,0.026489258,0.0070228577,-0.03665161,-0.03491211,-0.08123779,0.04815674,0.032287598,0.051574707,0.0012149811,0.012840271,-0.021331787,-0.017974854,-0.07220459,0.057556152,0.07287598,-0.0038070679,-0.012397766,0.023834229,-0.0029087067,-0.037384033,0.010650635,-0.018203735,-0.03152466,-0.02633667,0.014533997,-0.048828125,-0.00024414062,0.033569336,0.029724121,0.048736572,-0.0013208389,-0.05142212,-0.013175964,-0.012718201,-0.0058135986,-0.02720642,0.0053520203,-0.005519867,0.01474762,0.016143799,0.008354187,0.010955811,0.003528595,0.0008773804,-0.005355835,0.0041923523,-0.00484848,-0.028076172,0.017745972,-0.002155304,-0.056030273,0.009925842,-0.0028305054,0.07940674,-0.051696777,0.036621094,-0.00919342,0.01121521,0.047912598,-0.008041382,-0.05053711,0.002105713,0.025375366,0.0075950623,0.04824829,0.0099487305,-0.03540039,-0.018661499,0.07067871,-0.00881958,-0.004753113,0.0093307495,0.025909424,0.043182373,-0.0041656494,-0.06750488,-0.033233643,-0.0013065338,-0.04043579,0.028152466,-0.024734497,0.020309448,-0.014602661,0.008979797,-0.02267456,-0.0010089874,-0.031204224,0.0032424927,-0.016204834,0.0131073,-0.021224976,-0.023529053,0.025619507,0.02017212,-0.006298065,0.014823914,0.03817749,0.017715454,-0.00674057,-0.026046753,-0.022750854,-0.008430481,-0.009857178,0.011192322,0.017745972,0.028045654,0.052612305,-0.047088623,0.0076675415,0.021652222,0.014862061,0.030151367,-0.006729126,-0.0049057007,-0.06427002,-0.05545044,-0.0289917,-0.037963867,0.02645874,0.003419876,-0.012611389,0.05340576,0.014205933,-0.027832031,-0.039154053,0.016799927,-0.04257202,-0.0049743652,0.03567505,-0.024673462,-0.018554688,0.004760742,-0.011222839,0.009178162,0.03475952,0.020996094,0.033966064,0.062561035,0.04425049,0.008666992,0.021987915,0.009841919,0.029388428,0.0028247833,-0.026397705,-0.032043457,-0.01449585,0.034057617,-0.027313232,-0.023025513,-0.07171631,0.059509277,0.044128418,0.07873535,0.017807007,0.003353119,0.02670288,-0.0146102905,0.010795593,-0.027709961,-0.019119263,-0.020217896,-0.04586792,0.037994385,-0.017700195,-0.002937317,-0.023513794,0.037597656,-0.004421234,0.019760132,-0.024719238,0.044891357,-0.020736694,-0.008430481,0.019851685,0.015022278,0.050323486,0.06903076,-0.057525635,0.024215698,0.026947021,-0.023910522,0.008651733,0.036071777,-0.019577026,-0.0077285767,-0.053741455,-0.03152466,-0.0018892288,-0.0076408386,-0.052947998,0.009757996,0.013587952,0.017105103,0.02053833,-0.00447464,-0.01689148,-0.00043320656,-0.016326904,-0.060333252,0.0018053055,-0.02986145,-0.00056934357,0.044281006,-0.018066406,0.0011091232,0.0005931854,-0.00041389465,0.0072402954,0.016677856,0.027786255,-0.00017917156,-0.045074463,0.020889282,0.017486572,0.0041542053,0.006084442,0.03604126,0.024520874,0.028564453,0.053833008,0.016052246,-0.013343811,-0.06286621,0.021224976,-0.049987793,-0.00090265274,0.018295288,-0.031921387,-0.0010442734,-0.01033783,-0.03213501,-0.023651123,0.0059547424,-0.030227661,0.008285522,0.021713257,-0.020095825,-0.02720642,-0.048034668,-0.026626587,0.003232956,0.059783936,0.010505676,0.021606445,-0.05618286,-0.0028743744,0.024719238,0.010322571,0.038085938,-0.014709473,-0.010147095,-0.023132324,-0.0413208,-0.007926941,-0.02217102,0.025756836,-0.014144897,-0.003917694,0.0131073,0.009887695,0.026687622,0.00844574,0.0079193115,0.025100708,-0.02142334,-0.005744934,-0.006225586,0.042510986,0.021377563,-0.012870789,-0.048461914,0.046081543,0.018295288,0.03881836,-0.048583984,-0.0035743713,-0.004787445,0.0039634705,0.015945435,-0.006629944,-0.0004968643,-0.0035915375,-0.04324341,-0.053527832,0.046722412,-0.021499634,0.021224976,0.025268555,0.0036411285,0.02696228,-0.009292603,-0.0034770966,0.005252838,-0.028549194,-0.006526947,-0.023345947,-0.030807495,-0.020187378,-0.012466431,-0.02507019,0.032287598,-0.024841309,0.021591187,0.00919342,-0.016296387,0.030914307,0.0018854141,-0.0024414062,0.016052246,-0.0009832382,0.025283813,0.034332275,0.0040779114,-0.044281006,0.020217896,0.0025749207,0.012588501,-0.0010547638,0.041900635,0.031402588,-0.007881165,-0.010360718,-0.015296936,-0.022903442,-0.027755737,0.002035141,0.00907135,0.012413025,0.000082433224,-0.044708252,0.020614624,0.009346008,-0.032104492,-0.034332275,0.011444092,0.014839172,-0.032684326,0.01524353,0.026123047,0.05899048,-0.016738892,-0.0023040771,0.010238647,0.024215698,0.03717041,0.010093689,-0.0071640015,0.016830444,-0.014022827,0.009765625,-0.0032405853,-0.019744873,0.022537231,0.0029029846,0.022445679,0.022705078,0.0012350082,-0.01776123,-0.031585693,0.003479004,-0.011787415,-0.03378296,0.017028809,0.01802063,0.029571533,-0.023330688,0.018508911,0.019500732,-0.017074585,-0.018051147,-0.011070251,0.03881836,-0.01928711,-0.014022827,0.019058228,0.01725769,0.03265381,-0.06161499,-0.0051612854,0.005470276,0.021499634,-0.022903442,-0.0395813,-0.04095459,0.00012362003,0.036102295,0.018310547,0.028045654,0.04031372,0.008201599,0.009429932,0.021896362,0.00041627884,-0.018310547,-0.019439697,-0.0501709,-0.02583313,-0.016052246,-0.003578186,-0.027999878,0.016235352,-0.0042877197,-0.034484863,0.011222839,-0.009391785,-0.0035552979,-0.0062789917,0.014511108,0.04220581,0.0040130615,0.019180298,-0.02104187,-0.03945923,0.0009365082,0.009475708,0.019241333,-0.045806885,0.016937256,-0.012313843,-0.008895874,0.0019216537,0.0043754578,0.02507019,0.025924683,0.013412476,0.035217285,-0.04260254,0.045074463,-0.041809082,0.0075950623,0.005672455,-0.03567505,-0.012916565,-0.02772522,-0.01776123,0.03967285,-0.031585693,-0.0053253174,-0.033691406,-0.04269409,-0.017364502,-0.0597229,0.012138367,0.0435791,0.037475586,-0.032470703,0.00049829483,-0.0015926361,0.010971069,-0.013549805,0.0014362335,-0.0154953,0.024902344,0.01689148,0.008872986,-0.04083252,-0.02961731,-0.024490356,-0.003211975,-0.040008545,-0.04852295,-0.009155273,0.0022602081,-0.008728027,-0.018081665,-0.022827148,-0.032409668,-0.0048294067,-0.04159546,0.0055160522,0.006439209,0.021697998,0.0050315857,-0.024169922,0.0006570816,0.01977539,-0.015167236,0.04321289,0.008964539,-0.015075684,-0.041381836,0.011604309,0.013931274,0.018493652,-0.0033512115,-0.019622803,-0.015136719,-0.02204895,-0.053833008,-0.003314972,-0.005973816,-0.011428833,-0.014877319,0.0034999847,-0.04928589,-0.00022244453,-0.017578125,0.007282257,0.02230835,0.013290405,0.013412476,-0.0063591003,0.008872986,-0.001074791,-0.002790451,-0.033050537,0.016708374,0.010765076,0.009544373,0.038024902,0.038879395,0.005138397,-0.028045654,0.011688232,0.0069732666,0.014945984,-0.019714355,0.014076233,-0.016525269,0.009735107,-0.0056610107,-0.011756897,-0.03652954,0.0018253326,0.08721924,-0.002702713,-0.012641907,-0.013130188,-0.015960693,0.018127441,0.031341553,-0.03567505,-0.0003991127,-0.027709961,0.018539429,-0.02734375,0.011062622,0.005706787,0.021484375,-0.016448975,-0.05154419,-0.013839722,-0.011627197,-0.0065841675,-0.06298828,-0.027236938,-0.07623291,-0.00065231323,-0.0067749023,-0.02104187,0.0020618439,0.0061950684,-0.015670776,-0.07397461,-0.001203537,0.05001831,0.01235199,0.024139404,-0.0057373047,0.028259277,0.024261475,-0.03967285,-0.003955841,0.031921387,-0.029220581,-0.01979065,-0.021133423,0.016159058,-0.019515991,-0.011299133,0.0035114288,0.018127441,0.010314941,-0.013458252,0.0014247894,-0.011405945,0.013183594,-0.022277832,0.013717651,-0.013343811,-0.010429382,0.033294678,-0.043762207,0.02633667,0.0050468445,-0.013015747,0.007873535,0.028076172,0.047302246,-0.033233643,-0.015205383,0.01474762,0.017837524,0.032836914,-0.016189575,0.04522705,0.013435364,-0.019180298,0.010559082,-0.0065841675,-0.011688232,-0.032806396,-0.026123047,0.016036987,0.00020182133,0.0017023087,-0.018493652,-0.0016736984,0.012870789,0.004283905,0.017868042,-0.006477356,-0.021896362,-0.020584106,-0.00003951788,0.001452446,0.011505127,-0.0034427643,0.023284912,0.031829834,0.037322998,0.010040283,-0.016479492,0.0038051605,0.038635254,-0.0075416565,0.0011806488,0.02760315,0.005405426,0.021514893,0.026504517,0.015510559,-0.041381836,-0.023132324,-0.025802612,-0.018539429,-0.0054740906,-0.011291504,-0.013145447,-0.0023269653,0.0012102127,-0.0038928986,-0.031143188,0.0010795593,-0.024902344,-0.027893066,-0.0038414001,-0.017425537,0.028808594,0.0050468445,0.0055160522,0.012962341,-0.0012397766,0.04046631,-0.009384155,-0.018661499,0.029571533,0.024520874,0.015609741,-0.032073975,-0.0055503845,-0.018203735,-0.00699234,0.0059013367,-0.03567505,0.012756348,0.046539307,-0.019439697,0.00605011,0.012519836,0.021942139,-0.002407074,0.0033454895,-0.008728027,0.016647339,-0.0039482117,0.037017822,-0.053009033,0.020751953,0.014297485,0.009887695,-0.008773804,-0.007423401,-0.02583313,0.011932373,0.008422852,-0.0014238358,0.059020996,0.0019989014,0.032196045,-0.022003174,-0.022644043,0.013839722,-0.033996582,-0.01991272,0.019760132,0.0019741058,0.002773285,0.0048828125,-0.025405884,0.03262329,-0.034118652,0.020462036,0.0074005127,0.009506226,-0.0019235611,-0.028762817,-0.0020179749,-0.017501831,-0.018249512,0.0069274902,-0.00088977814,0.050109863,0.01776123,0.026382446,0.057617188,0.015098572,-0.0040512085,-0.03869629,-0.03387451,0.0022449493,-0.01802063,0.012046814,-0.017669678,0.05923462,0.040161133,0.0059127808,0.044799805,0.028945923,0.033935547,0.009475708,0.0039100647,-0.016159058,0.014930725,0.0029010773,0.027572632,-0.007965088,0.027755737,-0.037506104,0.030151367,0.015975952,0.03353882,-0.032318115,0.034179688,0.061035156,0.017700195,-0.013053894,0.040863037,-0.008781433,-0.011199951,-0.015296936,-0.016662598,0.061828613,0.0036010742,0.05203247,0.057617188,0.013511658,0.0019464493,0.017959595,-0.020904541,-0.017807007,0.06616211,0.02079773,-0.030044556,-0.01676941,-0.0011434555,0.011413574,-0.04257202,-0.02508545,0.024337769,-0.013679504,0.0076026917,-0.008384705,-0.002407074,-0.016906738,-0.001203537,0.021209717,0.010047913,-0.016677856,0.024230957,0.032470703,-0.0018777847,0.026382446,-0.006248474,0.024795532,-0.030044556,-0.02268982,0.015853882,0.020629883,-0.009765625,-0.0126953125,0.026504517,0.010566711,0.0345459,0.046783447,-0.02407837,0.008964539,0.03390503,0.012397766,-0.007583618,0.058624268,0.036254883,0.0184021,0.03982544,0.029434204,0.03173828,-0.041748047,0.02583313,0.004169464,0.00023782253,-0.014877319,-0.01474762,0.0003080368,-0.016113281,0.014518738,-0.00079250336,-0.009246826,0.024810791,0.026992798,-0.01222229,-0.0014448166,-0.006866455,0.013008118,-0.027999878,-0.0020427704,0.009979248,-0.013710022,0.03656006,0.009742737,0.028961182,-0.019577026,0.027633667,0.0032253265,-0.018981934,0.00010967255,0.023422241,-0.030441284,0.007965088,-0.0047721863,-0.0013666153,-0.05328369,0.012069702,0.029678345,-0.015625,0.028625488,0.012817383,-0.0054473877,-0.00434494,0.0259552,0.01007843,0.0018825531,-0.007865906,-0.017929077,0.030593872,0.048583984,-0.008026123,-0.0028591156,-0.03111267,-0.0023994446,0.010421753,-0.007873535,-0.008804321,-0.008239746,-0.015281677,-0.024398804,0.013969421,0.033081055,0.01638794,0.05709839,-0.025360107,-0.012916565,0.01159668,0.02960205,0.0038204193,0.0024490356,0.00017344952,0.012229919,-0.024139404,0.049743652,0.028778076,0.013534546,0.033843994,0.000056505203,-0.016983032,0.010223389,-0.0065460205,0.020996094,-0.013412476,0.008979797,0.001335144,0.033966064,-0.01737976,-0.042266846,0.0090408325,-0.020385742,-0.02935791,-0.017059326,0.017227173,0.0067367554,0.031982422,0.03656006,0.0262146,-0.021316528,0.061401367,-0.015350342,0.055725098,0.0022830963,-0.012535095,0.050354004,0.01576233,0.034606934,0.018157959,0.02053833,-0.035858154,0.02029419,0.030929565,0.024978638,0.009994507,0.00705719,-0.0121154785,0.038116455,-0.0008363724,0.02281189,-0.008232117,-0.0011377335,0.020004272,0.0034294128,-0.016693115,-0.0071029663,-0.0067749023,0.011703491,0.04321289,-0.030166626,-0.018859863,-0.03152466,-0.0074310303,0.022720337,-0.016601562,0.008636475,0.012435913,-0.018478394,0.011383057,-0.022033691,-0.031677246,-0.0018596649,0.022537231,-0.05142212,-0.011260986,0.002286911,0.015823364,-0.016418457,0.030517578,0.021697998,-0.0008420944,0.011550903,0.045684814,-0.0035362244,0.029434204,-0.0138549805,0.025222778,0.033599854,0.004081726,-0.016921997,-0.00233078,0.015083313,-0.009231567,0.012298584,0.039245605,-0.00667572,0.006389618,-0.001335144,-0.0019464493,0.004295349,0.0076942444,-0.0065727234,0.016937256,-0.014915466,-0.010314941,0.00025486946,0.0034008026,-0.0031356812,0.0057029724,-0.0085372925,-0.016983032,0.006385803,0.03616333,0.019958496,-0.039276123,-0.00012540817,0.0030651093,0.0049552917,-0.019729614,-0.0103302,-0.0023231506,-0.037384033,0.01725769,0.018188477,0.021697998,0.013381958,-0.026855469,0.0025806427,0.022354126,0.015457153,0.021621704,-0.0008277893,-0.0012264252,0.007843018,-0.00969696,-0.0023708344,-0.0064735413,-0.014694214,0.00749588,0.022827148,0.0035381317,-0.034240723,0.022644043,0.0032444,0.013015747,-0.003900528,-0.012641907,0.014808655,-0.009284973,0.00349617,-0.0026416779,0.011932373,-0.01235199,-0.012329102,-0.0099487305,0.04244995,0.05960083,-0.010292053,-0.013786316,0.02381897,0.01121521,0.017929077,0.032562256,0.0022201538,0.04244995,0.021453857,-0.017654419,-0.023956299,0.023727417,-0.014732361,-0.0262146,0.017929077,-0.02041626,-0.014282227,0.014640808,0.009307861,-0.0035324097,-0.029968262,-0.011268616,-0.013298035,-0.016326904,0.022262573,-0.014564514,0.01586914,-0.027755737,-0.0074386597,0.012908936,-0.028915405,-0.052337646,-0.0259552,-0.0109939575,-0.007659912,-0.0597229,0.004673004,-0.029785156,0.01158905,-0.034179688,-0.00078868866,-0.010673523,0.014312744,-0.015571594,-0.008865356,0.0028896332,0.01890564,0.021316528,0.00063180923,0.017700195,-0.040527344,-0.02330017,-0.020568848,0.009231567,-0.0071907043,0.025466919,-0.0021209717,0.038024902,0.024490356,-0.019134521,-0.0055999756,-0.007575989,-0.0048942566,-0.013198853,-0.01322937,-0.025268555,0.021850586,0.0072288513,-0.0104599,-0.0068206787,0.040039062,-0.02885437,-0.019515991,0.029312134,0.03829956,0.00920105,0.028442383,-0.01474762,-0.004623413,-0.023406982,0.00004631281,-0.016906738,0.012428284,0.005683899,0.0045928955,-0.008377075,0.008590698,0.022216797,-0.005088806,-0.008956909,0.03543091,0.0105896,-0.0054893494,0.035125732,0.0132369995,0.009544373,-0.009689331,-0.008834839,0.020736694,0.05078125,0.010116577,0.0018005371,-0.0071754456,0.004989624,-0.017028809,0.013153076,0.018920898,-0.0184021,-0.044403076,-0.013824463,-0.030456543,0.017700195,0.00003749132,0.015167236,-0.013580322,0.022354126,-0.016296387,-0.030151367,-0.021697998,0.030517578,0.017318726,-0.014656067,-0.011451721,0.010894775,0.009056091,-0.03604126,0.0051193237,-0.048339844,-0.034820557,-0.0019607544,-0.020889282,0.027236938,0.009338379,-0.010505676,-0.0017442703,-0.010673523,-0.0032176971,-0.00026535988,0.020202637,-0.0011920929,-0.0016326904,0.037017822,0.017837524,-0.015716553,0.017562866,-0.00390625,0.0057029724,0.014625549,-0.014076233,0.010696411,-0.014144897,0.030731201,-0.012451172,-0.010871887,0.026473999,-0.0044937134,0.013771057,-0.038848877,0.0040740967,-0.0044670105,-0.011383057,0.032440186,-0.035888672,-0.02166748,0.007896423,-0.016326904,-0.01902771,0.0025424957,0.013122559,0.035186768,-0.014823914,0.045318604,-0.01991272,-0.009010315,0.014297485,0.012962341,-0.009742737,0.007575989,0.029144287,0.0045166016,-0.009414673,-0.0012683868,-0.012138367,-0.033050537,-0.012641907,0.018875122,-0.0063667297,-0.009132385,0.026229858,0.014968872,0.042938232,-0.0011034012,0.016693115,0.008544922,0.0073928833,0.024047852,0.003042221,0.05908203,-0.0029392242,-0.029510498,0.0022563934,0.003528595,-0.019210815,-0.0028305054,-0.012268066,-0.0032920837,-0.03451538,0.012832642,-0.006702423,0.018951416,-0.020523071,0.013549805,-0.020126343,-0.00089788437,-0.037322998,-0.0071372986,-0.030700684,0.010810852,0.02571106,-0.0032978058,0.026107788,0.0008945465,-0.01878357,0.019821167,0.04864502,-0.011367798,-0.027435303,-0.014328003,0.006340027,-0.0026111603,0.01739502,0.005783081,-0.028915405,-0.014335632,0.009765625,-0.022354126,0.008522034,-0.0070495605,0.017837524,0.008331299,-0.0008831024,-0.009033203,0.027786255,-0.007980347,-0.005153656,0.012748718,0.005783081,0.0309906,0.032226562,-0.014915466,0.025558472,0.014511108,-0.038848877,0.057769775,0.0003066063,0.027023315,-0.019638062,0.0018510818,-0.03488159,-0.014480591,-0.020248413,-0.0030002594],"createdAt":"2026-04-18T18:50:33.780Z","updatedAt":"2026-04-23T21:32:17.420Z","lastSeenAt":"2026-04-23T21:32:17.420Z","tsv":"'/api/v1/payments/323':57,192 '/request':13,28,152 '0.02':12,27,74,151 '000':68 '20':67 '402':204 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,88 'across':108 'advertis':79 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,81,162 'attach':91 'base':8,23,51,69 'broader':104 'call':4,19,76 'caller':89 'categori':110 'challeng':205 'charg':64 'classif':125 'confirm':199 'connect':171 'content':177 'convers':142 'crypto-paid API' 'data':111,115,213 'descript':188 'doc':161 'document':156,208 'embed':126 'endpoint':55,107,145,193,197 'estim':136 'exampl':185 'exchang':131 'export':116 'extrem':158 'feed':130 'financ':127 'four':109 'function':215 'gas':135 'generat':143 'geocod':140 'header':96 'howev':155 'http-post' 'i.e':73 'infrastructur':138 'insight':117 'instant':87 'key':82 'label':59 'learn':120 'limit':85 'list':147 'live':200 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':181 'page':166 'particular':217 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,101 'per':3,18,36,75 'platform':6,21,39,78,105 'point':154 'premium':60 'price':129,153,163 'prompt':173 'proof':102 'protocol':44 'provid':219 'quot':134 'rate':84,132 'readm':165 'render':168 'report':114 'request':37 'request/response':184 'return':195,201 'rout':218 'schema':182 'sentiment':121 'simpli':90 'specif':54,194 'substant':176 'summar':124 'text':123 'thin':159 'token':133 'unclear':211 'unit':70 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':139 'valid':99,141,203 'via':10,25 'wallet':172 'web3':128 'without':207 'x':94 'x-payment':93 'x402':11,26,43,100 'x402 API' 'x402-payment'","prices":[{"id":"4ae9ed9f-0c71-4025-a998-9312aef36db8","listingId":"36561486-60ee-4662-beb6-f3d40939ba80","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/323","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:33.780Z"}],"sources":[{"listingId":"36561486-60ee-4662-beb6-f3d40939ba80","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/323","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:33.780Z","lastSeenAt":"2026-04-23T21:32:17.420Z"}],"details":{"listingId":"36561486-60ee-4662-beb6-f3d40939ba80","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/323 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/323"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/323"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off API calls paid in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.73Z"},"updatedAt":"2026-04-23T21:32:17.420Z"}}