{"id":"c7f9dcca-8a8f-405c-aca0-811a248dfe25","shortId":"kyqcKF","kind":"x402","title":"x402-gated Premium API Access endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated Premium API Access endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/94` is live and returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nHowever, the actual functionality behind this particular path (`/apikeys/94`) is unclear. The site's landing page lists many other endpoints (metrics, reports, sentiment analysis, summarization, etc.) but does not specifically describe what `/api/v1/apikeys/94` does. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further documentation. Without an OpenAPI spec, request/response schemas, or detailed documentation, the precise input parameters and output format remain unknown. The platform's value proposition is low-friction, pay-per-call API access with no API keys or rate limits required.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 API access","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The exact functionality of /api/v1/apikeys/94 is undocumented — the path name suggests API key generation but this is speculative.","No OpenAPI spec, no request schema, and no response schema are available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","The site lists many other endpoints but none match this specific path, raising questions about what this endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/94","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/apikeys/94","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, but there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, and the specific functionality of /api/v1/apikeys/94 is not described anywhere. Request/response schemas are completely unknown, 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":"2026-04-19T15:21:44.077Z","embedding":[-0.0030879974,-0.027572632,0.04788208,0.027862549,0.023849487,-0.03778076,-0.020370483,0.048095703,0.06173706,-0.0736084,0.027999878,-0.0368042,-0.04434204,-0.03567505,-0.028915405,0.0021572113,-0.016830444,-0.0007286072,-0.068725586,0.04034424,0.040924072,-0.024368286,-0.009674072,0.040008545,0.01576233,-0.019866943,-0.007843018,-0.016586304,-0.008300781,-0.045043945,0.02458191,-0.027648926,-0.008857727,0.022949219,-0.004047394,-0.011749268,-0.009880066,0.037902832,0.03933716,-0.0052833557,-0.0018472672,-0.06213379,-0.017211914,0.007545471,-0.02973938,0.0062217712,0.0020103455,-0.023162842,-0.016342163,0.00944519,-0.025466919,0.0032863617,-0.020645142,-0.0046691895,0.0055122375,0.018539429,-0.022338867,-0.016860962,-0.0038318634,0.016494751,0.0036182404,-0.048828125,-0.001616478,0.0019006729,0.006877899,0.049835205,-0.008735657,0.041229248,0.013870239,0.06762695,0.0423584,0.058258057,0.033050537,0.023651123,-0.01096344,0.003540039,-0.007926941,0.05090332,0.006580353,-0.015731812,-0.017120361,0.0008869171,-0.04888916,-0.019073486,-0.021118164,-0.0597229,-0.016952515,0.017944336,-0.008743286,0.023712158,-0.0703125,-0.010124207,-0.019058228,0.023498535,0.003129959,0.0064086914,-0.030014038,0.024398804,-0.021438599,0.011413574,0.0069122314,-0.04446411,0.024383545,0.01914978,0.05279541,0.04498291,0.0101623535,0.021514893,0.008239746,-0.03717041,-0.03439331,0.00059604645,-0.018157959,-0.017684937,0.036499023,-0.0060806274,-0.021255493,0.015235901,-0.015464783,0.015731812,-0.05911255,0.057037354,0.03717041,-0.030151367,0.007545471,-0.05493164,-0.002620697,-0.011146545,-0.027679443,-0.019470215,0.018508911,0.010757446,0.029449463,-0.0035171509,-0.02067566,0.005634308,-0.0026779175,-0.031951904,-0.047912598,-0.0056495667,0.027618408,-0.026611328,0.027038574,0.0287323,-0.097839355,-0.01109314,-0.055236816,0.0016756058,-0.04711914,-0.014671326,0.006793976,0.013748169,-0.009185791,-0.016021729,-0.0030384064,-0.01675415,0.0040779114,0.0340271,-0.009407043,0.043151855,-0.0030021667,0.04626465,0.013923645,0.014175415,0.030303955,0.045715332,0.012771606,-0.0848999,-0.08459473,-0.04220581,-0.021972656,-0.014389038,-0.03768921,0.007686615,-0.0033855438,-0.0869751,-0.035705566,-0.009994507,-0.0041999817,-0.040618896,-0.015449524,-0.034484863,0.00037312508,-0.0032291412,-0.06530762,-0.0067443848,-0.024673462,0.06903076,0.0039024353,0.007572174,0.02709961,-0.0053749084,0.064819336,0.0058898926,-0.021255493,-0.04876709,0.024749756,-0.013328552,0.039398193,0.017990112,0.0012435913,-0.03237915,0.0385437,0.04144287,0.01977539,-0.006542206,0.0062294006,-0.05014038,-0.03414917,-0.025894165,0.003921509,0.017166138,0.004371643,0.018310547,-0.032836914,-0.018432617,-0.00548172,0.009735107,0.023040771,0.068237305,-0.017166138,-0.003648758,0.008399963,0.031066895,-0.027954102,0.044769287,0.030288696,0.017044067,-0.021911621,-0.019363403,0.033447266,0.040008545,-0.020202637,0.0016651154,-0.022216797,0.024459839,0.016082764,0.0037651062,0.028289795,-0.018997192,-0.013870239,-0.034942627,-0.009735107,0.030578613,0.0014657974,-0.02885437,-0.052825928,-0.076538086,0.03778076,0.043945312,0.036834717,-0.00032496452,-0.0038089752,-0.019744873,-0.0069618225,-0.053863525,0.04345703,0.07348633,-0.0181427,-0.019699097,0.022201538,-0.012107849,-0.030471802,-0.021850586,0.0032997131,-0.03326416,-0.015258789,0.019165039,-0.033355713,-0.00039982796,-0.0005736351,0.032104492,0.048583984,-0.015899658,-0.028945923,-0.030151367,0.0076026917,-0.0028247833,-0.039642334,-0.0027618408,0.008049011,0.0017337799,0.034057617,0.0031833649,0.026168823,-0.0046424866,0.020507812,-0.008903503,-0.026290894,-0.028625488,-0.021728516,0.02229309,0.001209259,-0.058898926,0.027282715,0.004634857,0.040130615,-0.039276123,0.035949707,-0.00856781,0.0149002075,0.03427124,-0.013153076,-0.0519104,0.0004606247,0.018493652,0.056152344,0.050842285,0.022537231,-0.005317688,0.007583618,0.06707764,-0.014320374,-0.0027770996,0.010307312,0.0128479,0.029403687,-0.010025024,-0.044128418,-0.034484863,-0.018096924,-0.039794922,0.020324707,-0.03668213,0.034240723,-0.014755249,-0.0043678284,-0.014755249,0.003396988,-0.04046631,0.029312134,-0.03314209,0.006023407,-0.023895264,-0.03768921,0.002702713,0.029968262,-0.017929077,-0.0044555664,0.025421143,0.009178162,-0.0054779053,-0.030197144,-0.006591797,-0.019119263,0.016525269,0.032714844,0.021713257,0.014320374,0.047607422,-0.02053833,0.023147583,0.02746582,0.008010864,0.03778076,-0.009468079,0.009437561,-0.054840088,-0.055511475,-0.01361084,-0.03842163,0.025543213,0.0053710938,0.0015735626,0.043640137,0.00083494186,-0.015487671,-0.050720215,0.03439331,-0.027450562,-0.0044403076,0.026367188,0.001745224,-0.055419922,0.004283905,0.017303467,0.014526367,0.03363037,0.010726929,0.012031555,0.06518555,0.039733887,0.0010404587,0.016189575,0.02619934,0.021438599,0.0006761551,-0.0362854,-0.023498535,0.004837036,0.010360718,-0.016571045,-0.024276733,-0.075683594,0.052215576,0.031219482,0.07110596,0.015960693,0.015777588,0.042999268,-0.015586853,0.0021247864,-0.02998352,-0.013374329,-0.018432617,-0.032470703,0.025421143,-0.0135269165,-0.002002716,-0.022415161,0.033355713,0.008018494,0.013465881,-0.05557251,0.06390381,0.012702942,0.01373291,0.0084991455,0.0073242188,0.031463623,0.045135498,-0.048034668,0.014419556,0.015792847,-0.02645874,0.00018560886,0.049926758,-0.0095825195,-0.018829346,-0.074035645,-0.022384644,0.012512207,-0.015319824,-0.055145264,-0.02017212,0.01247406,0.014053345,0.02394104,-0.03503418,-0.036956787,0.005180359,-0.023834229,-0.061309814,0.0043029785,-0.0463562,0.017074585,0.04119873,-0.030548096,-0.024429321,0.019363403,-0.0022354126,-0.015411377,0.02407837,-0.004501343,0.0010557175,-0.039916992,0.027648926,0.0047569275,0.014793396,0.018753052,0.024398804,0.03918457,0.022216797,0.044128418,0.01902771,-0.024230957,-0.04647827,0.012077332,-0.041992188,0.008880615,0.005783081,-0.023849487,-0.0037784576,-0.010749817,-0.031143188,-0.024887085,0.008987427,-0.030639648,0.011726379,0.040374756,-0.052612305,-0.01235199,-0.0597229,-0.015426636,-0.006351471,0.075683594,0.040649414,-0.0058670044,-0.06036377,-0.020767212,0.02748108,0.0070724487,0.0031223297,-0.015686035,-0.009544373,0.0006432533,-0.021911621,-0.03137207,-0.019836426,0.030227661,0.00045609474,-0.018920898,0.021240234,0.026428223,0.00046229362,0.0035209656,0.00497818,0.030792236,-0.032928467,-0.0034427643,-0.034942627,0.01184845,-0.0041007996,-0.0181427,-0.043701172,0.04714966,0.014122009,0.044433594,-0.029663086,-0.0012159348,-0.0046577454,0.027572632,0.012962341,-0.001461029,-0.006839752,0.0043678284,-0.05166626,-0.08239746,0.036743164,-0.022537231,0.031066895,0.0048713684,0.016616821,0.039093018,-0.003314972,-0.0015487671,0.03161621,-0.03488159,-0.016586304,-0.028945923,-0.022888184,-0.018875122,0.017959595,-0.015449524,0.0059661865,-0.0065727234,0.0044021606,-0.0060195923,-0.023132324,0.02633667,0.006717682,-0.004173279,0.020706177,0.0072288513,0.019180298,0.046722412,0.0052833557,-0.031219482,0.02923584,-0.0022964478,-0.0019817352,0.0026111603,0.050231934,0.033416748,-0.022903442,-0.0032367706,0.0042381287,-0.004634857,-0.022583008,-0.02293396,0.011047363,0.032714844,0.00415802,-0.037872314,0.027923584,0.031829834,-0.035827637,-0.0021419525,0.031433105,0.028625488,-0.029373169,0.03289795,0.00869751,0.055725098,-0.011940002,-0.0040779114,-0.00044202805,0.025375366,0.011299133,0.0134887695,-0.022155762,0.009208679,-0.024169922,0.0043945312,-0.010482788,0.008911133,0.021408081,-0.007423401,0.0044937134,0.016036987,0.016677856,-0.024383545,-0.027755737,0.0014028549,-0.005744934,-0.009269714,0.006816864,0.018798828,0.020904541,-0.027542114,0.025344849,0.015396118,-0.04232788,-0.019729614,-0.024627686,0.056274414,-0.014862061,-0.0006785393,0.0099487305,0.008056641,0.01461792,-0.05130005,0.004962921,0.007926941,0.016571045,-0.027297974,-0.057403564,-0.028137207,-0.01096344,0.039855957,0.0140686035,0.013031006,0.022277832,0.00023305416,0.0022945404,0.022598267,0.004016876,-0.004638672,-0.01398468,-0.022445679,-0.001074791,0.008224487,0.003932953,-0.022476196,0.0073547363,-0.02394104,-0.019226074,0.009490967,-0.013053894,0.00027298927,0.00032639503,0.020385742,0.028961182,0.0011701584,0.01576233,-0.01940918,-0.018432617,0.015060425,0.0073509216,0.010261536,-0.03765869,0.0289917,-0.017608643,-0.016113281,-0.011779785,0.011688232,0.016845703,0.020401001,0.008872986,0.029312134,-0.052825928,0.038269043,-0.04434204,0.008583069,0.0001322031,-0.02583313,-0.0009937286,-0.030303955,-0.021820068,0.035247803,-0.0019741058,-0.0058135986,-0.024749756,-0.021820068,-0.007183075,-0.045654297,0.022888184,0.023284912,0.034851074,-0.030685425,-0.011207581,0.0034770966,-0.006706238,-0.0073623657,-0.0014486313,-0.011688232,0.028396606,0.028030396,-0.0011863708,-0.036621094,-0.014373779,-0.010871887,-0.016967773,-0.0519104,-0.048339844,-0.018157959,0.027709961,-0.0079956055,0.0047569275,-0.032226562,-0.023803711,0.0062065125,-0.032714844,0.0026779175,-0.009010315,0.0018358231,0.0010757446,-0.015289307,0.004245758,0.028320312,-0.032318115,0.0340271,-0.00032782555,-0.012161255,-0.035888672,0.0037517548,0.03604126,0.020904541,0.002691269,-0.0038394928,-0.0045776367,-0.033172607,-0.043182373,-0.012382507,-0.016326904,-0.006729126,0.011398315,-0.0099105835,-0.04257202,-0.019485474,-0.01914978,-0.00831604,0.0158844,0.021255493,0.013946533,-0.003145218,0.0048942566,-0.005882263,-0.012527466,-0.043640137,0.0045394897,0.011482239,0.012435913,0.008918762,0.050109863,0.018432617,-0.00667572,0.005001068,-0.008468628,0.026367188,-0.02015686,0.011314392,-0.01890564,0.0060272217,-0.0010223389,-0.018325806,-0.023117065,0.0030384064,0.07409668,-0.00094890594,-0.0039749146,-0.00037050247,-0.021774292,0.010429382,0.013038635,-0.06762695,-0.005870819,-0.02571106,0.008842468,-0.00541687,0.018035889,0.010734558,0.0015869141,-0.021575928,-0.050567627,-0.0002822876,0.022537231,0.002067566,-0.058685303,-0.0135269165,-0.0395813,-0.021362305,-0.011245728,-0.01737976,0.0060272217,-0.004386902,-0.005256653,-0.087768555,0.00831604,0.05014038,0.008911133,0.013313293,-0.015838623,0.0057411194,0.019012451,-0.029693604,-0.015625,0.033233643,-0.022705078,-0.02973938,-0.018157959,0.03604126,-0.02784729,-0.02293396,0.02722168,-0.013145447,0.031585693,-0.0055122375,0.021881104,-0.013328552,0.011077881,-0.020019531,0.011985779,-0.004005432,-0.00030946732,0.02458191,-0.04901123,0.013877869,0.018615723,0.009513855,-0.009384155,0.024276733,0.025466919,-0.0435791,-0.017684937,0.043121338,-0.0077400208,0.027389526,-0.03488159,0.050201416,0.010391235,-0.011184692,0.016098022,-0.0093688965,-0.031829834,-0.050994873,-0.03286743,0.020614624,0.014862061,0.024230957,-0.008117676,-0.001490593,0.028396606,0.0059280396,0.0013341904,-0.020202637,-0.020141602,-0.030151367,-0.00017130375,0.011680603,0.0011205673,0.0051574707,0.028381348,0.029937744,0.049224854,0.0011396408,-0.0047683716,0.022201538,0.0059547424,-0.01600647,0.00014519691,0.016693115,0.010444641,0.015274048,0.019424438,0.016571045,-0.026794434,-0.014297485,-0.025222778,-0.0028972626,0.011962891,-0.002374649,-0.0065727234,-0.009490967,0.0039024353,0.012512207,-0.03778076,0.029052734,-0.04119873,-0.026367188,0.00907135,-0.013404846,0.0073776245,0.019348145,0.008705139,0.018356323,0.006374359,0.06744385,0.008926392,0.0020446777,0.03137207,0.03451538,0.014549255,-0.029022217,-0.009361267,-0.002565384,0.0058403015,0.0038394928,-0.022216797,0.008399963,0.04296875,-0.025909424,0.0070991516,-0.0051574707,0.022247314,-0.015586853,0.008872986,-0.001496315,0.01424408,-0.023513794,0.024871826,-0.03781128,0.007820129,0.018920898,0.0067100525,0.0064048767,-0.024505615,-0.03604126,0.016418457,-0.0014400482,-0.03225708,0.042938232,-0.008132935,0.027191162,-0.012084961,-0.024810791,0.011245728,-0.026123047,-0.009681702,0.04119873,-0.013031006,-0.0060577393,0.027542114,-0.023834229,0.041931152,-0.04135132,-0.002199173,0.008239746,-0.009681702,-0.02015686,-0.0060272217,-0.030288696,0.0023784637,-0.015571594,-0.013809204,0.008995056,0.051818848,0.050598145,0.023391724,0.028747559,0.0021781921,0.022232056,-0.052856445,-0.020202637,0.0026302338,-0.028167725,0.02545166,-0.0074043274,0.050079346,0.045928955,-0.0072746277,0.034729004,0.03717041,0.015716553,-0.0016498566,0.018920898,-0.007873535,0.027893066,-0.0049819946,0.032104492,0.015571594,0.035095215,-0.033355713,0.0045166016,0.003774643,0.0063591003,-0.032470703,0.02784729,0.06915283,0.035827637,-0.0017824173,0.03640747,-0.010185242,-0.014335632,-0.035614014,-0.021652222,0.05770874,0.011703491,0.044311523,0.04373169,0.01096344,-0.008369446,0.017211914,-0.028533936,-0.027893066,0.07110596,0.018630981,-0.018096924,-0.013366699,-0.016906738,0.009521484,-0.043548584,-0.033813477,0.006652832,-0.0066566467,0.008735657,-0.016921997,0.0013790131,-0.016830444,0.020477295,0.009208679,0.016464233,-0.023376465,0.033813477,0.0070533752,0.011039734,0.028457642,0.0004930496,0.03463745,-0.030471802,-0.013000488,0.00308609,0.020629883,0.0026302338,-0.01096344,0.026000977,0.023468018,0.04675293,0.038269043,-0.011436462,0.006454468,0.024002075,0.018173218,0.0063819885,0.043151855,0.026947021,0.007865906,0.01927185,0.04095459,0.024490356,-0.03186035,0.0018577576,-0.008033752,0.008201599,-0.010925293,-0.024383545,0.005592346,-0.011039734,0.00881958,0.00034356117,-0.017410278,0.035827637,0.030075073,0.0129470825,0.0018558502,-0.008621216,0.0035305023,-0.0010719299,0.007369995,0.020431519,-0.012138367,0.022521973,0.009864807,0.025680542,-0.036834717,0.018310547,0.009918213,-0.016021729,-0.0073165894,0.012611389,-0.049346924,-0.0034999847,0.00033044815,0.00299263,-0.040802002,0.013824463,0.027572632,0.0039482117,0.041290283,0.012290955,-0.001616478,0.0045433044,0.008552551,0.0141067505,-0.015716553,-0.008155823,-0.029968262,0.017623901,0.031402588,-0.0039138794,0.022216797,-0.014083862,-0.0031909943,0.010665894,-0.017227173,-0.0041046143,-0.00058317184,-0.011878967,-0.038116455,0.007980347,0.049835205,0.023742676,0.028533936,-0.004470825,-0.023132324,-0.00080156326,0.024230957,0.0073165894,0.0020771027,-0.021148682,0.02331543,0.008148193,0.057281494,0.033172607,0.005771637,0.015464783,-0.032318115,-0.015686035,-0.006427765,-0.022018433,0.020217896,-0.015609741,0.012886047,-0.008201599,0.026535034,-0.019195557,-0.039154053,0.0036945343,-0.013092041,0.003786087,-0.019363403,0.0076026917,0.013008118,0.01739502,0.030548096,0.025024414,-0.015640259,0.06939697,-0.004436493,0.060455322,-0.03152466,-0.014038086,0.043182373,0.03652954,0.029830933,0.0062026978,0.012565613,-0.025680542,0.006652832,0.049468994,0.032196045,0.0012836456,-0.0031032562,-0.021865845,0.032989502,0.0054626465,0.024276733,-0.01525116,-0.017211914,0.012878418,-0.013305664,-0.02017212,0.009307861,-0.0054092407,0.011627197,0.047576904,-0.039855957,-0.008178711,-0.014404297,-0.030014038,0.032073975,0.0046081543,0.011444092,0.0012178421,-0.035614014,0.016021729,-0.03050232,0.0036144257,-0.0012588501,0.034820557,-0.048431396,-0.008453369,-0.0017738342,0.02684021,-0.025299072,0.021057129,0.033111572,-0.011383057,0.009941101,0.04815674,-0.004989624,0.04650879,0.00012123585,0.032073975,0.051849365,0.0070991516,-0.015220642,0.010955811,0.016708374,-0.019470215,0.0013656616,0.045684814,-0.0073509216,0.0019264221,0.01612854,-0.015541077,0.0037555695,0.010765076,0.0055656433,-0.008636475,-0.014404297,-0.00674057,0.004901886,0.017456055,0.008979797,0.0014352798,-0.009376526,-0.015129089,0.012573242,0.033813477,-0.0077056885,-0.02986145,-0.01687622,0.0126953125,0.021774292,-0.020751953,-0.028457642,-0.021224976,-0.04208374,0.011703491,0.031143188,0.0064811707,0.0018491745,-0.031799316,-0.004470825,0.023605347,0.0090408325,0.009780884,0.0029640198,-0.009292603,0.0129776,-0.023162842,-0.0033855438,-0.012718201,-0.010978699,0.0041999817,0.019042969,-0.0039634705,-0.028457642,0.013366699,0.0033187866,0.013748169,0.0052948,-0.018356323,0.030639648,-0.0155181885,-0.016098022,0.004211426,0.018798828,-0.024475098,-0.024887085,-0.020645142,0.026657104,0.039794922,-0.007873535,-0.014297485,0.0077781677,0.01626587,0.03012085,0.034484863,-0.0011053085,0.042266846,0.02104187,-0.010246277,-0.026397705,0.010772705,-0.02507019,-0.024887085,0.0103302,-0.014259338,-0.019607544,0.033935547,0.0011949539,-0.0055007935,-0.028244019,-0.016906738,-0.007835388,-0.018951416,0.030075073,-0.009422302,0.009887695,-0.020996094,-0.0040397644,-0.00031638145,-0.0026493073,-0.045715332,-0.021759033,-0.002752304,-0.014335632,-0.047424316,0.0030899048,-0.033935547,0.00907135,-0.0155181885,-0.017486572,0.000992775,0.031921387,-0.0062713623,0.011421204,0.013084412,0.02784729,0.0033874512,0.016967773,0.033813477,-0.015930176,-0.030822754,-0.015274048,0.008735657,-0.018432617,0.012161255,-0.010040283,0.047973633,0.013015747,-0.0011148453,0.0008983612,-0.009239197,-0.0077056885,-0.008407593,-0.029632568,-0.026351929,0.0087890625,0.03314209,-0.0047035217,-0.018859863,0.043884277,-0.018478394,0.0019664764,0.022613525,0.04638672,0.0037994385,0.035888672,-0.009239197,-0.017486572,-0.021026611,-0.005378723,-0.022491455,0.011352539,0.023040771,0.01184082,0.0016784668,-0.0027275085,0.0129852295,-0.016662598,0.008049011,0.020736694,-0.0021381378,-0.017105103,0.033416748,0.012748718,-0.0042152405,-0.0184021,-0.017425537,0.013870239,0.03640747,0.018600464,-0.0029506683,-0.0048599243,0.015357971,-0.0022525787,0.006412506,0.007873535,-0.021438599,-0.024047852,-0.025680542,-0.034820557,0.0184021,0.01550293,0.019927979,0.0046424866,0.020019531,-0.010856628,-0.03036499,-0.019256592,0.027893066,-0.004699707,-0.012550354,-0.0063972473,-0.002111435,0.007965088,-0.02204895,0.0057258606,-0.03982544,-0.027755737,-0.006313324,-0.025756836,0.011421204,0.0071411133,-0.016189575,0.010093689,-0.006149292,-0.006565094,0.0041999817,0.029586792,-0.011016846,-0.011672974,0.0014638901,0.009254456,-0.026687622,0.0007314682,-0.01084137,-0.007282257,0.028213501,-0.0050354004,0.016586304,-0.0051002502,0.024932861,0.006919861,-0.011276245,0.027572632,0.0037956238,0.01612854,-0.020874023,-0.00077581406,0.0025043488,-0.0037174225,0.020645142,-0.01828003,-0.022705078,0.0035438538,-0.023406982,-0.03894043,-0.002407074,0.02784729,0.026947021,-0.012260437,0.026123047,-0.005092621,-0.0093688965,0.008682251,0.012260437,-0.017608643,-0.004020691,0.0491333,0.00894928,-0.00096797943,-0.008201599,-0.0050849915,-0.026733398,-0.01763916,0.019500732,-0.007659912,-0.009979248,0.010665894,0.007686615,0.03366089,0.0069122314,0.009567261,0.017990112,0.0023174286,0.02658081,0.0028018951,0.050811768,-0.0051574707,-0.026901245,-0.00484848,0.016906738,-0.023498535,-0.0035572052,-0.007713318,0.0115356445,-0.033111572,0.01953125,-0.006603241,0.03012085,-0.018493652,0.0015516281,-0.022384644,-0.032165527,-0.025772095,-0.006374359,-0.043914795,-0.0005631447,0.035247803,0.021072388,0.0023269653,0.0038852692,-0.028182983,0.034179688,0.05960083,0.0022678375,-0.02218628,-0.0090408325,0.0066184998,-0.0035362244,-0.0051498413,0.00983429,-0.03137207,-0.018463135,-0.007209778,-0.019607544,0.006439209,0.0064315796,0.008720398,0.01374054,-0.021820068,0.0019397736,0.02104187,0.008995056,-0.0028705597,0.008033752,0.0027313232,0.032043457,0.025772095,-0.0077590942,0.022964478,0.02532959,-0.037994385,0.04827881,-0.0181427,0.016662598,-0.022125244,0.006198883,-0.04055786,-0.009567261,-0.0016498566,-0.0007786751],"createdAt":"2026-04-18T19:29:34.975Z","updatedAt":"2026-04-22T09:01:54.337Z","lastSeenAt":"2026-04-22T09:01:54.337Z","tsv":"'/api/v1/apikeys/94':86,171 '/apikeys/94':147 '0.02':11,26,73,114 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':125 '0x8335':108 '1':96 '20':102 '2913':109 '300':128 '6':118 'Base network API' 'USDC API' 'accept':133 'access':6,21,38,222 'actual':141 'address':124 'advertis':55 'ai':62 'analysi':162 'analyt':61 'api':5,20,37,177,221,225 'application/json':138 'base':9,24,81,104,111 'behind':39,143 'broad':57 'call':220 'catalog':58 'challeng':94 'connect':183 'data':60 'decim':119 'describ':169 'detail':197 'doc':174 'document':189,198 'endpoint':7,22,32,48,85,132,158 'equal':113 'etc':164 'exact':98 'financ':65 'format':205 'friction':216 'function':142 'gate':3,18 'given':115 'howev':139 'http-post' 'infrastructur':68 'input':201 'json-response' 'key':226 'land':153 'learn':64 'limit':229 'list':155 'live':88 'low':215 'low-frict':214 'lowpaymentfee' 'lowpaymentfee.com':34,52 'machin':63 'mani':47,156 'metric':159 'micropayment API' 'network':82 'offer':49 'one':45 'openapi':192 'output':204 'page':154,178 'paramet':202 'particular':145 'path':146 'pay':10,25,218 'pay-per-cal':217 'pay-per-call API' 'pay-per-request' 'payment':120 'paywal':42 'per':12,27,74,219 'platform':53,209 'post':134 'precis':200 'premium':4,19,36 'premium API' 'price':71,175 'prompt':185 'proposit':212 'provid':35 'rate':228 'remain':206 'render':180 'report':160 'request':13,28,75,99,135 'request/response':194 'requir':230 'return':90,137 'schema':195 'scheme':97 'second':129 'sent':122 'sentiment':161 'settl':76 'site':151 'span':59 'spec':193 'specif':84,168 'summar':163 'timeout':130 'unclear':149 'unit':105 'unknown':207 'usdc':15,30,78,107,116 'usdc-base' 'util':69 'valid':92 'valu':211 'version':95 'wallet':184 'web3':66 'without':190 'x402':2,17,41,93 'x402 API access' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"d564d737-5121-42d4-9c50-bbef0e2b81bd","listingId":"c7f9dcca-8a8f-405c-aca0-811a248dfe25","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/apikeys/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:34.975Z"}],"sources":[{"listingId":"c7f9dcca-8a8f-405c-aca0-811a248dfe25","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:34.975Z","lastSeenAt":"2026-04-22T09:01:54.337Z"}],"details":{"listingId":"c7f9dcca-8a8f-405c-aca0-811a248dfe25","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/94 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/94"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/94"},{"claim":"The site lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing traditional API keys","Agent-driven workflows that need on-demand API access settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-per-request API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone who needs to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.885Z"},"updatedAt":"2026-04-22T09:01:54.337Z"}}