{"id":"5c848c29-0201-400a-8f5b-9a31983162ac","shortId":"G7bL7y","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The platform advertises four categories of APIs: 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 $0.02 per request.\n\nThe specific endpoint at `/api/v1/inbox/49` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are advertised. The endpoint accepts POST requests and returns application/json.\n\nNote that the crawled documentation is extremely thin: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/inbox/49` path specifically is unclear — it does not match any of the named API categories on the landing page. Treat this listing as a stub until richer documentation is available.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The path /api/v1/inbox/49 does not match any of the named APIs listed on the landing page — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No example responses or error codes documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/49","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/inbox/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and costs $0.02 USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/inbox/49 path doesn't correspond to any named API on the site. Effectively a stub.","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":"2026-04-21T21:53:39.670Z","embedding":[-0.03277588,-0.016784668,0.030090332,0.02027893,0.017028809,-0.04269409,-0.02079773,0.042022705,0.058746338,-0.06573486,0.02746582,-0.051361084,-0.02166748,-0.027130127,-0.028274536,0.025115967,-0.0037078857,0.006767273,-0.060943604,0.04260254,0.037994385,-0.017150879,-0.008468628,0.0524292,-0.006778717,-0.026397705,-0.0015850067,-0.010185242,-0.008399963,-0.028915405,0.02305603,-0.027709961,0.0029335022,0.017501831,-0.010787964,-0.006000519,0.008560181,0.05407715,0.021850586,-0.013748169,-0.013893127,-0.040039062,0.03086853,-0.012619019,-0.049316406,-0.0009946823,0.012641907,-0.020950317,-0.012054443,-0.0045394897,-0.02708435,0.002784729,0.0017852783,0.015151978,0.02394104,0.010910034,-0.0039901733,-0.005886078,0.016616821,0.02885437,-0.00223732,-0.06542969,-0.018600464,0.0041389465,0.021591187,0.054504395,-0.004840851,0.047790527,0.01550293,0.0793457,0.0289917,0.046173096,0.030303955,0.009017944,0.022262573,-0.030410767,-0.007896423,0.049835205,-0.022384644,-0.0053367615,-0.02229309,-0.01727295,-0.058044434,-0.019927979,-0.019439697,-0.060577393,-0.014671326,0.027435303,-0.04321289,0.023544312,-0.081604004,-0.015449524,-0.018447876,0.012535095,-0.0069999695,-0.016342163,-0.018997192,0.00667572,-0.0015382767,0.026672363,0.014228821,-0.04940796,0.016830444,0.005695343,0.055511475,0.035888672,0.010955811,0.020645142,0.007637024,-0.026977539,-0.032562256,0.0043182373,-0.024719238,-0.017181396,0.009048462,-0.00182724,-0.0035438538,0.024810791,-0.03515625,0.030792236,-0.041168213,0.049957275,0.0066337585,-0.005458832,0.0015172958,-0.055664062,0.012001038,0.0026073456,-0.041259766,-0.002216339,0.03491211,0.016662598,0.025238037,-0.02810669,-0.05355835,-0.010749817,-0.0256958,-0.019729614,-0.040527344,-0.014724731,0.04095459,-0.026809692,0.01626587,0.025878906,-0.06555176,-0.010574341,-0.044128418,0.0035057068,-0.013931274,-0.0069732666,0.011436462,0.022766113,-0.019500732,-0.030654907,-0.017822266,-0.024230957,0.00970459,0.047546387,-0.014762878,0.040496826,-0.0036334991,-0.00051784515,0.012130737,-0.015235901,0.0035572052,0.03375244,0.011550903,-0.09094238,-0.07952881,-0.030303955,0.010932922,-0.0036506653,-0.0289917,-0.0035362244,-0.001001358,-0.06774902,-0.042236328,-0.022644043,0.0056915283,-0.044281006,0.0067100525,-0.019546509,0.018707275,-0.031585693,-0.03842163,-0.018936157,-0.013076782,0.04260254,0.015258789,0.006767273,0.027114868,-0.00894928,0.05810547,0.037017822,-0.022994995,-0.04147339,0.018600464,-0.025405884,0.05429077,0.02659607,0.009124756,-0.027542114,0.034362793,0.062072754,-0.009002686,-0.011360168,0.009986877,-0.025222778,-0.041778564,-0.028396606,0.014442444,-0.0026283264,-0.019500732,0.018371582,-0.029693604,-0.043426514,-0.009559631,-0.0019512177,0.020950317,0.0579834,0.0082473755,0.036621094,0.007865906,0.024841309,-0.013626099,0.044677734,0.03857422,0.004501343,-0.025680542,-0.007381439,0.013442993,0.03842163,-0.03729248,-0.012420654,0.0007572174,0.03250122,-0.0063056946,0.008049011,0.023635864,-0.0043678284,-0.031555176,-0.03363037,-0.0040664673,0.018341064,0.010559082,-0.031036377,-0.049591064,-0.060394287,0.023712158,0.051574707,0.037506104,0.010246277,-0.00881958,-0.02507019,-0.011749268,-0.049835205,0.04663086,0.06829834,-0.01461792,-0.024963379,0.031433105,-0.018753052,-0.030792236,0.010467529,0.0037021637,-0.02772522,-0.0064353943,0.009147644,-0.048095703,-0.0026168823,0.005256653,0.030654907,0.050079346,-0.009567261,-0.04537964,-0.025436401,-0.0035877228,-0.008293152,-0.02670288,0.0040397644,-0.0140686035,0.020019531,0.03173828,-0.0071144104,0.029510498,-0.002319336,0.031585693,-0.009414673,0.0010585785,-0.033691406,-0.020889282,0.019836426,0.011993408,-0.04977417,0.007820129,-0.016098022,0.051757812,-0.054779053,0.043273926,-0.014198303,0.024719238,0.032104492,0.014549255,-0.052124023,-0.012298584,0.019973755,0.044677734,0.047790527,0.011405945,-0.0024547577,-0.016098022,0.058258057,-0.030578613,-0.005859375,0.01121521,0.024551392,0.028137207,0.00053691864,-0.03942871,-0.02658081,-0.019927979,-0.019836426,0.025527954,-0.020965576,0.039154053,-0.0037555695,0.020629883,-0.016220093,-0.0033569336,-0.04284668,0.020950317,-0.04574585,-0.0053596497,-0.02015686,-0.033355713,0.014602661,0.0134887695,-0.016204834,0.00054359436,0.049621582,0.02470398,-0.010917664,-0.038024902,-0.023651123,-0.03881836,-0.0024909973,0.016357422,0.032226562,0.015182495,0.030792236,-0.03677368,-0.0003068447,0.041534424,0.00592041,0.047332764,0.007965088,-0.0013971329,-0.06903076,-0.056640625,-0.008934021,-0.046173096,0.0033454895,0.016525269,0.012054443,0.047424316,0.0037593842,-0.016052246,-0.07269287,0.024856567,-0.044647217,0.01878357,0.0418396,-0.021865845,-0.050933838,0.0053138733,0.015151978,0.012382507,0.03439331,0.013549805,0.0014066696,0.08660889,0.035369873,0.0050735474,0.023101807,0.023391724,0.018051147,-0.015205383,-0.012367249,-0.027618408,-0.009391785,0.023208618,-0.027511597,-0.013267517,-0.08068848,0.048187256,0.02848816,0.076049805,0.0025520325,0.017608643,0.029525757,0.00024938583,0.0027866364,-0.021118164,-0.022903442,-0.044036865,-0.041625977,0.024902344,-0.007247925,-0.00037837029,-0.037750244,0.007583618,-0.009605408,0.005821228,-0.036315918,0.0496521,-0.008033752,-0.0075187683,0.010612488,0.014022827,0.053833008,0.046661377,-0.04928589,0.015312195,0.017303467,-0.015930176,0.013038635,0.03945923,-0.0116119385,-0.0070266724,-0.07104492,-0.042236328,-0.019058228,-0.024337769,-0.06341553,-0.0011768341,-0.013893127,0.024627686,0.011177063,-0.006954193,-0.020935059,0.007911682,-0.029342651,-0.05593872,-0.0107040405,-0.043426514,0.030303955,0.034088135,-0.027572632,0.0042648315,-0.0067863464,-0.014389038,-0.016937256,0.019470215,0.009559631,-0.009559631,-0.059173584,0.028320312,-0.0022964478,0.009292603,0.019302368,0.021636963,0.029525757,0.011100769,0.05343628,0.016799927,-0.018920898,-0.04776001,0.022491455,-0.043060303,0.00018537045,0.010223389,-0.024642944,-0.000065386295,-0.010665894,-0.04901123,-0.020462036,0.004501343,-0.016235352,-0.0065574646,0.027069092,-0.039215088,-0.03253174,-0.046691895,-0.027786255,-0.004299164,0.07800293,0.014587402,-0.0017318726,-0.05593872,-0.016113281,0.01109314,0.008628845,0.009651184,-0.015716553,-0.01689148,-0.02067566,-0.031219482,-0.037017822,-0.020736694,0.04348755,0.009780884,-0.0077438354,0.033325195,0.00047397614,0.009391785,-0.008911133,-0.0053863525,0.033721924,-0.025634766,-0.010627747,-0.028182983,0.0231781,0.01222229,-0.0049209595,-0.051361084,0.05960083,0.014884949,0.046875,-0.029724121,-0.0045318604,-0.011306763,0.037872314,0.009689331,-0.023162842,-0.006290436,0.013771057,-0.050567627,-0.08996582,0.028808594,-0.019485474,0.00843811,0.006652832,0.014404297,0.030090332,-0.016220093,0.014862061,0.006641388,-0.026565552,-0.004589081,-0.030853271,-0.02319336,-0.002084732,0.0038146973,-0.017654419,0.018157959,-0.010177612,0.007896423,-0.02130127,-0.018493652,0.043823242,-0.003162384,0.0033302307,0.036987305,-0.0027313232,0.01838684,0.03540039,0.015670776,-0.04043579,0.04071045,-0.008399963,0.005016327,-0.009017944,0.048706055,0.033294678,-0.007209778,-0.022628784,-0.0074501038,-0.012672424,-0.019989014,-0.009628296,0.01499176,0.027008057,-0.002527237,-0.036834717,0.016616821,0.00041222572,-0.03503418,-0.025772095,0.012390137,0.024780273,-0.046142578,0.016723633,0.0155181885,0.051513672,-0.031143188,0.012756348,0.008003235,0.034423828,0.03744507,0.0044670105,-0.0149002075,0.011833191,-0.008178711,0.0135650635,-0.0058403015,-0.015167236,0.023590088,0.0009775162,0.024169922,0.03869629,0.016723633,-0.019729614,-0.024932861,0.0045814514,-0.011604309,-0.011245728,0.015960693,0.020965576,0.028945923,-0.02633667,0.020462036,0.01725769,-0.044128418,-0.022109985,-0.030578613,0.03878784,0.008720398,0.016159058,0.025466919,0.0019741058,0.0046920776,-0.048553467,-0.0068855286,0.00869751,0.0062065125,-0.008865356,-0.054656982,-0.049346924,-0.014671326,0.02128601,0.009422302,0.010948181,0.031188965,-0.00699234,-0.009056091,0.018676758,0.009185791,-0.0063591003,-0.011238098,-0.03866577,-0.008293152,-0.004295349,-0.0099105835,-0.027145386,0.02041626,-0.017562866,-0.02067566,-0.00472641,-0.014137268,0.004852295,-0.0075645447,0.00957489,0.03857422,0.008796692,0.016311646,-0.006450653,-0.027786255,-0.00061273575,-0.005004883,0.028945923,-0.0395813,0.01348114,-0.0077590942,0.008918762,-0.012832642,0.009788513,0.016418457,0.01826477,0.0064888,0.033599854,-0.028717041,0.032684326,-0.007987976,0.004875183,0.001490593,-0.019622803,-0.0024814606,-0.021972656,-0.01802063,0.034851074,-0.02810669,-0.024093628,-0.011543274,-0.029205322,-0.008842468,-0.03945923,0.02508545,0.028503418,0.035827637,-0.04135132,0.0099487305,0.025238037,0.006729126,-0.018569946,-0.0051651,0.0012350082,0.024780273,0.016677856,0.0031757355,-0.029159546,-0.016281128,-0.008613586,0.0011663437,-0.048339844,-0.054229736,-0.01386261,0.017990112,0.010223389,-0.00060653687,-0.03137207,-0.0259552,0.003534317,-0.035827637,0.012786865,-0.008644104,0.020629883,-0.005168915,-0.036865234,0.00058698654,0.033081055,-0.014198303,0.024627686,-0.0030765533,-0.011810303,-0.04815674,0.007160187,0.04260254,0.009437561,0.00096321106,-0.03060913,0.006504059,-0.026443481,-0.06173706,-0.0007252693,-0.024429321,0.013809204,-0.004184723,0.015640259,-0.05557251,0.0017766953,-0.020980835,-0.0048561096,0.020217896,0.011123657,-0.0026187897,-0.013328552,0.0052757263,-0.011817932,-0.008598328,-0.02760315,0.008728027,0.011528015,-0.0037345886,0.023666382,0.049804688,0.000009179115,-0.013717651,0.017745972,-0.000059902668,0.020233154,-0.02796936,0.007522583,-0.020858765,0.0088272095,-0.012367249,-0.011528015,-0.036590576,-0.012496948,0.0690918,-0.0012083054,0.024032593,-0.014480591,-0.011795044,0.009506226,0.040771484,-0.04638672,-0.0031414032,-0.02947998,0.018463135,-0.026992798,0.025177002,0.003162384,0.013771057,-0.023498535,-0.048858643,-0.0020179749,0.007827759,0.008743286,-0.057617188,-0.018035889,-0.06616211,0.006011963,-0.024597168,-0.029159546,0.0010738373,-0.0030822754,-0.019073486,-0.07928467,0.0059051514,0.052886963,-0.0013284683,0.028717041,-0.009521484,0.01802063,0.028533936,-0.014350891,-0.000055909157,0.005584717,-0.025909424,-0.011550903,-0.015686035,0.04373169,0.0019350052,-0.022201538,0.021850586,0.012718201,0.028152466,-0.0138549805,0.03012085,-0.019073486,0.022583008,-0.0038928986,0.018569946,-0.013404846,-0.009185791,0.02885437,-0.05621338,0.030044556,0.01309967,0.0026378632,-0.0076026917,0.028045654,0.025146484,-0.030395508,-0.024154663,0.020050049,0.0037517548,0.027038574,-0.024810791,0.04949951,0.010673523,-0.016067505,0.017929077,-0.015312195,-0.014160156,-0.02557373,-0.038970947,0.018371582,0.004142761,0.010505676,-0.013687134,-0.0057411194,0.015571594,0.0049057007,0.0067596436,-0.016494751,-0.013122559,-0.0078048706,-0.0012102127,0.0015535355,0.009918213,0.0049209595,0.026290894,0.03567505,0.02355957,-0.012916565,-0.015075684,-0.0010871887,0.023147583,-0.0028457642,0.0027503967,0.02357483,0.02243042,0.009017944,0.017807007,0.020263672,-0.03643799,-0.014175415,-0.0082473755,-0.004425049,0.010597229,-0.022094727,0.009666443,-0.0012521744,-0.000936985,-0.0102005005,-0.046875,0.00299263,-0.03149414,-0.030471802,-0.0077056885,-0.003030777,0.03387451,0.012107849,-0.00058555603,0.003271103,0.0072288513,0.04171753,0.00046348572,-0.02243042,0.039886475,0.042114258,0.018554688,-0.03942871,-0.009185791,0.010520935,0.005504608,0.0012493134,-0.020263672,0.0068244934,0.038330078,-0.018035889,0.01586914,-0.018035889,0.032318115,-0.0010614395,0.014633179,-0.013969421,0.014266968,-0.013641357,0.024780273,-0.04232788,0.019165039,0.03817749,0.0062294006,-0.011878967,-0.03387451,-0.031585693,0.027145386,0.006313324,-0.003435135,0.04800415,0.0060653687,0.030960083,-0.017593384,-0.01725769,-0.0138549805,-0.030181885,-0.024414062,0.021453857,0.004386902,0.009712219,0.014022827,-0.02746582,0.025405884,-0.031463623,0.0077056885,0.010498047,0.000048279762,-0.014213562,-0.0184021,-0.0045661926,0.0031280518,-0.021743774,-0.0059661865,-0.0059814453,0.05380249,0.033172607,0.03765869,0.028640747,0.01612854,0.0063819885,-0.044769287,-0.033935547,-0.00085258484,-0.019317627,0.02230835,-0.023345947,0.055877686,0.047668457,-0.0016126633,0.027069092,0.048736572,0.042144775,-0.01285553,0.023422241,-0.018447876,0.01638794,-0.015853882,0.020965576,0.00013160706,0.04244995,-0.03945923,0.0110321045,0.016815186,0.015686035,-0.017959595,0.030014038,0.07293701,0.023712158,0.0035705566,0.017486572,-0.0070381165,-0.016342163,-0.007255554,-0.020751953,0.049468994,0.010871887,0.050231934,0.023208618,0.010429382,-0.0038585663,0.025009155,-0.015541077,-0.02003479,0.04537964,0.021636963,-0.027572632,-0.008392334,-0.0023536682,0.005897522,-0.042877197,-0.019500732,0.028182983,0.01222229,0.011833191,-0.003921509,0.011497498,-0.010253906,0.015960693,-0.00018024445,-0.002784729,0.006958008,0.022964478,0.019119263,0.0060424805,0.035186768,0.01927185,0.027511597,-0.030517578,-0.017593384,0.026153564,0.015235901,0.004386902,0.003168106,0.04034424,0.010093689,0.0395813,0.026031494,-0.028427124,-0.011398315,0.011161804,0.010482788,0.0107040405,0.06604004,0.014175415,0.0047950745,0.032196045,0.04309082,0.015670776,-0.018814087,0.016799927,-0.0093307495,0.015182495,-0.008636475,-0.0259552,0.0072669983,0.00920105,0.0206604,0.00894928,-0.010398865,0.009185791,0.018966675,0.0019378662,0.008262634,-0.00484848,0.012451172,-0.007194519,-0.006214142,0.01626587,-0.019683838,0.015312195,0.0038318634,0.026290894,-0.023590088,0.014228821,0.0026016235,-0.010734558,-0.0064735413,0.025756836,-0.03527832,0.0010213852,0.00566864,-0.014831543,-0.041931152,0.012718201,0.01033783,-0.01499176,0.021972656,0.01838684,-0.024902344,0.004699707,0.028884888,0.012054443,0.004360199,-0.006919861,-0.024230957,0.0118637085,0.049041748,0.006137848,-0.005268097,-0.03579712,-0.0055770874,0.013046265,-0.012001038,-0.0104599,0.01222229,0.0027618408,-0.044311523,0.023956299,0.02772522,0.019927979,0.017532349,-0.018798828,-0.00522995,-0.004638672,0.028717041,0.013725281,0.005142212,-0.0059890747,0.01727295,-0.014709473,0.038879395,0.04019165,-0.00094366074,0.038360596,-0.008399963,-0.0041046143,-0.0035266876,-0.03250122,0.012054443,-0.027816772,0.0009598732,-0.01449585,0.03164673,-0.02192688,-0.022247314,0.004425049,-0.0033073425,-0.020614624,-0.016220093,0.019042969,0.0085372925,0.032989502,0.0418396,0.01852417,-0.035186768,0.06726074,-0.018920898,0.04598999,-0.009780884,-0.0020046234,0.062927246,0.0446167,0.031219482,0.0027542114,0.0038967133,-0.037994385,0.01197052,0.032104492,0.028884888,0.015960693,-0.0052986145,-0.0131073,0.040374756,-0.013679504,0.021774292,-0.0049057007,-0.01133728,0.01461792,-0.018920898,-0.015914917,0.0026931763,0.0016651154,0.013633728,0.041259766,-0.018371582,-0.0066871643,-0.022415161,-0.014038086,0.034210205,-0.005378723,-0.01210022,-0.0113220215,-0.011756897,0.005355835,-0.023391724,-0.009262085,0.013839722,0.028381348,-0.050689697,-0.017807007,0.018569946,0.021026611,-0.026733398,0.03793335,0.019317627,-0.0126571655,0.02017212,0.039642334,-0.0040664673,0.023239136,-0.016784668,0.036743164,0.05609131,0.009552002,0.0003912449,0.009414673,0.007911682,-0.0121536255,0.011978149,0.030303955,0.0062446594,0.006652832,-0.005092621,-0.0127334595,0.005580902,0.015541077,-0.012290955,-0.00096559525,-0.0036888123,-0.015144348,0.004749298,0.016906738,0.009437561,0.008911133,-0.012557983,-0.0059432983,0.008888245,0.05026245,0.030395508,-0.037719727,-0.0021190643,0.010871887,0.008888245,-0.022262573,-0.01007843,-0.016723633,-0.03326416,0.01600647,0.030334473,0.011451721,0.013946533,-0.020355225,-0.0034065247,0.03491211,0.015037537,0.002943039,0.0056533813,-0.013809204,0.0052223206,-0.01663208,0.0065612793,-0.018157959,-0.003030777,0.0053367615,0.006679535,-0.012191772,-0.025360107,0.014320374,-0.0068855286,0.010498047,-0.010627747,0.0040626526,0.023605347,-0.00056552887,-0.014755249,0.005455017,0.005382538,-0.015380859,-0.01826477,-0.029373169,0.011169434,0.05831909,-0.012336731,0.0038452148,0.014076233,0.026138306,0.030410767,0.036102295,0.0012426376,0.04776001,0.020828247,-0.024169922,-0.032562256,0.020385742,-0.016693115,-0.024536133,0.026855469,-0.017547607,-0.02255249,0.006385803,-0.0006866455,0.0014295578,-0.022888184,-0.014213562,-0.029937744,-0.026870728,0.028427124,-0.0079193115,0.010192871,-0.02519226,-0.007610321,0.017700195,-0.024505615,-0.03869629,-0.018173218,-0.003610611,-0.020965576,-0.066589355,0.014297485,-0.0259552,0.011497498,-0.020858765,0.00032949448,-0.013259888,0.041015625,-0.011260986,0.0069465637,0.00006151199,0.032165527,0.009918213,0.015930176,0.022842407,-0.032592773,-0.038391113,-0.005432129,0.00680542,-0.008888245,0.0113220215,-0.013687134,0.0317688,-0.0012216568,-0.013534546,0.0024528503,-0.0029354095,0.001537323,-0.00932312,-0.029556274,-0.027038574,0.020187378,0.024353027,-0.010139465,0.0039482117,0.04800415,-0.0023155212,-0.008270264,0.013015747,0.024978638,0.015686035,0.022964478,-0.013771057,-0.007160187,-0.0357666,0.0087509155,-0.018630981,0.012535095,-0.0014066696,0.014427185,-0.021148682,0.024108887,0.031585693,-0.01121521,-0.004852295,0.019561768,-0.0032787323,-0.0066833496,0.03262329,0.0045051575,-0.0042800903,-0.016143799,-0.012008667,0.020965576,0.064819336,0.013801575,0.01612854,-0.011810303,0.008911133,-0.0046081543,-0.0019550323,0.00969696,-0.039001465,-0.032836914,-0.018692017,-0.018035889,0.021743774,-0.005039215,0.010955811,-0.0069122314,0.022628784,-0.001004219,-0.029769897,-0.021697998,0.03338623,-0.01927185,-0.008972168,0.0031909943,0.0064849854,0.013687134,-0.027404785,-0.0054779053,-0.03942871,-0.04244995,-0.027267456,-0.011238098,0.032196045,0.0047302246,-0.018249512,0.00945282,0.00024557114,-0.0052223206,0.018447876,0.01574707,-0.012550354,-0.006259918,0.0121154785,0.018722534,-0.027755737,0.020446777,-0.015258789,-0.010765076,0.008277893,-0.010757446,0.025665283,-0.012245178,0.024429321,0.021469116,-0.0018978119,0.029632568,0.0010814667,0.01058197,-0.022155762,0.01108551,-0.015327454,-0.012413025,0.033050537,-0.00630188,-0.010093689,-0.011276245,-0.012611389,-0.025054932,0.016921997,0.027389526,0.023101807,-0.018371582,0.04373169,-0.023010254,-0.0026474,0.021347046,0.014579773,-0.028457642,0.0055351257,0.03933716,-0.006629944,0.0007419586,-0.004180908,-0.000705719,-0.034301758,-0.00749588,0.007843018,0.006980896,-0.013191223,0.020996094,0.002817154,0.034362793,-0.0056762695,0.008483887,0.021759033,0.010192871,0.03387451,0.0074424744,0.02709961,0.0012540817,-0.024490356,-0.012123108,0.007583618,-0.024749756,-0.0017547607,-0.0037822723,0.016479492,-0.039398193,0.013511658,0.0019216537,0.028961182,-0.011207581,0.0138549805,-0.028533936,0.000005841255,-0.030395508,0.008644104,-0.041259766,-0.0013427734,0.042388916,0.018600464,0.021957397,-0.0077400208,-0.032043457,0.039031982,0.04638672,0.007068634,-0.039733887,-0.014602661,0.006340027,0.00044703484,0.0016107559,-0.0017852783,-0.023468018,-0.03173828,-0.0070991516,-0.019500732,0.0046195984,-0.0025615692,0.023132324,0.023666382,0.004146576,-0.008560181,0.01260376,-0.013641357,-0.0035800934,-0.0090789795,-0.0042495728,0.023712158,0.034362793,-0.0051002502,0.02104187,0.024932861,-0.039001465,0.055145264,-0.007843018,0.034088135,-0.018920898,0.02041626,-0.031463623,-0.030685425,-0.0107421875,0.0003478527],"createdAt":"2026-04-21T18:32:22.023Z","updatedAt":"2026-04-22T05:32:10.453Z","lastSeenAt":"2026-04-22T05:32:10.453Z","tsv":"'/api':175 '/api/v1/inbox/49':111,208 '/pricing':176 '/readme':178 '/request':17,34 '0.02':16,33,104,140 '000':128 '0x8335':133 '20':127 '6':136 'accept':160 'access':116 'advertis':61,157 'ai':10,27,73 'analysi':77 'analyt':67 'api':4,21,41,65,115,150,221 'application/json':165 'avail':237 'base':7,24,57,129,135 'base usdc api' 'base-network' 'behind':49 'categori':63,222 'challeng':122 'classif':80 'connect':184 'content':190 'convers':97 'crawl':169 'data':9,26,66,70 'decim':137 'document':170,199,235 'embed':81 'endpoint':14,31,48,100,109,159 'equal':139 'estim':91 'exact':147 'exampl':203 'exchang':86 'export':71 'extrem':172 'feed':85 'financ':11,28,82 'four':62 'gas':90 'gate':3,20,44 'generat':98 'geocod':95 'infrastructur':93 'insight':72 'json-response' 'key':151 'label':113 'land':225 'learn':75 'limit':155 'list':102,229 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':74 'made':143 'marketplac':42 'match':216 'maxamountrequir':125 'metric':68 'micropay':54 'micropayment api' 'name':220 'network':58 'no-api-key' 'note':166 'offer':8,25 'openapi':194 'page':179,226 'path':209 'pay-per-call api' 'payment':141 'per':51,105 'per-request':50 'per-request-billing' 'platform':5,22,60 'post':161 'post-endpoint' 'premium':114 'price':84 'prompt':186 'protocol':40 'purpos':205 'quot':89 'rate':87,154 'report':69 'request':52,106,162 'request/response':197 'resolv':181 'return':118,164 'richer':234 'schema':198 'scheme':148 'sentiment':76 'spec':195 'specif':108,210 'stub':232 'subscript':152 'summar':79 'text':78 'thin':173 'token':88 'treat':227 'unclear':212 'unit':130 'usag':202 'usdc':53,132 'usdc-micropayment' 'util':13,30,94 'valid':96,120 'varieti':46 'via':144 'wallet':185 'web3':83 'x402':2,19,39,121,146 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"cfbb816e-cbd2-4675-935a-9b92ff01888b","listingId":"5c848c29-0201-400a-8f5b-9a31983162ac","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/inbox/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.023Z"}],"sources":[{"listingId":"5c848c29-0201-400a-8f5b-9a31983162ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.023Z","lastSeenAt":"2026-04-22T05:32:10.453Z"}],"details":{"listingId":"5c848c29-0201-400a-8f5b-9a31983162ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/49","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/49"}],"useCases":["Paying per-request for data analytics or AI inference without managing API keys","Integrating crypto-native micropayments into agent workflows on Base","Accessing utility endpoints (geocoding, validation, conversion) with instant x402 settlement"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where subscriptions are wasteful"],"notFor":["Users needing detailed API documentation or OpenAPI schemas before integration","High-throughput production workloads requiring SLAs or guaranteed uptime","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.018Z"},"updatedAt":"2026-04-22T05:32:10.453Z"}}