{"id":"785ef7a2-2f2e-4c7b-8cce-d42c5447bd6e","shortId":"duubAc","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request. Payment is settled in USDC on the Base network, requiring no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/payments/52` is listed under the title \"Premium API Access\" but the crawl material does not clarify what data or functionality this particular route returns. The platform's landing page lists other endpoints such as sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — all at the same $0.02 price point. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a maximum payment of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. Prospective users should be aware that without documentation it is unclear what request body this endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","micropayment API","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt","No OpenAPI or schema describing request body or response format for this endpoint","The purpose of /api/v1/payments/52 ('Premium API Access') is not explained anywhere in the crawl material","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/52","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/52","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, confirming pricing and network. However, there is no documentation, no OpenAPI spec, no request/response schema, and no clarity on what 'Premium API Access' at /api/v1/payments/52 actually does. This is 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":"2026-04-19T07:18:37.907Z","embedding":[-0.012031555,-0.029281616,0.04925537,0.017089844,0.010574341,-0.028762817,-0.013618469,0.041748047,0.08319092,-0.07543945,0.021102905,-0.05795288,-0.026687622,-0.038726807,-0.028015137,0.004184723,-0.007987976,0.0033302307,-0.026443481,0.03475952,0.027313232,-0.018066406,-0.034606934,0.03390503,0.0008163452,-0.022583008,-0.0135650635,-0.012619019,-0.020935059,-0.03741455,0.042633057,-0.029418945,0.0033721924,0.0023345947,-0.020706177,-0.01826477,-0.008903503,0.038970947,0.031982422,-0.012924194,-0.002111435,-0.054718018,-0.01235199,-0.0043182373,-0.06274414,-0.012786865,0.0059127808,-0.018066406,-0.0024852753,0.012702942,-0.040252686,-0.010139465,-0.0063285828,0.004055023,0.0066604614,0.0038928986,-0.0001205802,-0.02268982,0.0066604614,0.01071167,0.009963989,-0.06585693,-0.022888184,-0.013343811,0.003276825,0.053497314,-0.010475159,0.04800415,0.005908966,0.052215576,0.045166016,0.05102539,0.017822266,0.02230835,0.0073013306,-0.0014009476,0.0032024384,0.06829834,-0.015472412,-0.024749756,-0.014099121,-0.013153076,-0.046875,-0.00027894974,-0.018997192,-0.04550171,-0.015197754,0.016998291,-0.022842407,0.0262146,-0.07067871,-0.0062408447,-0.012359619,0.0050735474,0.00737381,-0.003786087,-0.01727295,0.014060974,-0.017974854,0.020828247,0.009185791,-0.045776367,0.013931274,0.012954712,0.046203613,0.04034424,0.021987915,0.026031494,0.0112838745,-0.0181427,-0.039642334,0.01890564,-0.0030536652,-0.0048446655,0.001950264,0.010154724,-0.017364502,0.013084412,-0.02104187,0.01525116,-0.039398193,0.059509277,0.011962891,-0.010040283,0.014419556,-0.044525146,-0.009674072,0.013694763,-0.031173706,-0.010154724,0.011886597,0.0062713623,0.031219482,-0.020141602,-0.03527832,0.01158905,-0.022354126,-0.008529663,-0.055877686,-0.03933716,0.04055786,-0.032989502,0.018722534,0.030548096,-0.0993042,-0.015029907,-0.037628174,0.0018854141,-0.034851074,-0.00762558,-0.00038337708,0.025604248,-0.02104187,-0.0055618286,-0.023727417,-0.016021729,0.002216339,0.035614014,-0.023284912,0.055145264,-0.007320404,0.027450562,0.033203125,0.0115356445,0.028640747,0.027420044,-0.000080406666,-0.08282471,-0.08679199,-0.025283813,-0.0018596649,-0.02281189,-0.03387451,0.010864258,-0.0046844482,-0.06921387,-0.025390625,-0.0062065125,-0.011726379,-0.035247803,0.0051498413,-0.03086853,0.0138549805,-0.0052452087,-0.06109619,-0.026168823,-0.01852417,0.066345215,0.024887085,0.012519836,0.03744507,-0.021728516,0.054107666,0.01965332,-0.01966858,-0.025756836,0.025466919,-0.02229309,0.010910034,-0.0019025803,0.0076904297,-0.0357666,0.034057617,0.06713867,0.017471313,-0.01386261,-0.0052948,-0.050201416,-0.043914795,-0.031555176,0.011978149,0.0015497208,0.0033664703,0.035461426,-0.024536133,-0.03488159,-0.0032958984,0.009391785,0.01966858,0.061920166,0.01838684,-0.003534317,0.024551392,0.022445679,-0.039733887,0.03375244,0.03286743,0.016235352,-0.029800415,-0.024490356,0.022842407,0.041107178,-0.02418518,0.019241333,-0.01789856,0.027420044,-0.013381958,0.013748169,0.023712158,-0.017730713,-0.028503418,-0.03112793,-0.028137207,0.036102295,0.010498047,-0.016342163,-0.042022705,-0.08239746,0.048065186,0.031982422,0.050567627,-0.008491516,0.0109939575,-0.02218628,-0.01600647,-0.07989502,0.056121826,0.07293701,-0.017456055,-0.017532349,0.014030457,-0.0055274963,-0.028121948,-0.009513855,-0.0077667236,-0.031341553,-0.034057617,0.0029296875,-0.04888916,-0.013031006,0.010231018,0.03201294,0.053344727,0.006248474,-0.052001953,-0.028045654,-0.01272583,-0.0035114288,-0.0309906,-0.0002667904,-0.008430481,0.0118637085,0.03640747,-0.007865906,0.019515991,-0.005378723,0.0028305054,0.0028419495,-0.0021247864,-0.0178833,-0.028900146,0.016983032,-0.006248474,-0.06335449,0.008712769,-0.0044288635,0.07562256,-0.042816162,0.041992188,-0.0020179749,0.0026245117,0.059143066,-0.007545471,-0.04800415,0.005630493,0.021484375,0.02230835,0.040222168,-0.000767231,-0.03387451,-0.019180298,0.062561035,-0.016815186,-0.005870819,0.014060974,0.017227173,0.043548584,-0.0052604675,-0.06719971,-0.027450562,-0.0053482056,-0.024780273,0.021026611,-0.015029907,0.02305603,-0.014472961,0.005004883,-0.02659607,0.0046844482,-0.028137207,0.0154418945,-0.024887085,0.0052452087,-0.010231018,-0.014678955,0.022857666,0.018295288,-0.012550354,0.0044136047,0.03942871,0.024749756,-0.0104599,-0.03414917,-0.020904541,-0.0158844,0.0015554428,0.013900757,0.02772522,0.01826477,0.05505371,-0.035888672,0.014213562,0.034088135,0.023605347,0.04626465,0.0017442703,-0.00027656555,-0.078125,-0.045837402,-0.020843506,-0.048919678,0.022613525,0.0064964294,0.0042304993,0.05609131,0.012268066,-0.022338867,-0.040222168,0.01826477,-0.04107666,-0.009994507,0.0368042,-0.0073394775,-0.024429321,-0.0048065186,-0.009208679,0.0071144104,0.02760315,0.013374329,0.011802673,0.06695557,0.04434204,-0.003868103,0.011138916,0.003818512,0.025146484,0.0011987686,-0.028045654,-0.021820068,-0.012901306,0.017654419,-0.001080513,-0.014793396,-0.0637207,0.059753418,0.045715332,0.07623291,0.010635376,0.011428833,0.03515625,-0.014526367,0.0014343262,-0.021469116,-0.01928711,-0.016204834,-0.054107666,0.03338623,-0.025375366,-0.005760193,-0.017227173,0.037902832,-0.001253128,0.023010254,-0.030761719,0.041381836,0.00088119507,-0.006958008,0.016433716,0.010314941,0.04660034,0.06488037,-0.04147339,0.03036499,0.013511658,-0.040527344,0.0066490173,0.027938843,-0.017929077,-0.010375977,-0.052825928,-0.02406311,0.0064926147,0.0031147003,-0.058258057,-0.0010023117,0.009811401,0.016799927,0.028137207,-0.018737793,-0.021850586,-0.0030956268,-0.014343262,-0.06124878,-0.018234253,-0.033111572,0.004459381,0.03817749,-0.023071289,-0.008483887,0.0069847107,-0.008659363,0.0049858093,0.013084412,0.025939941,-0.0005507469,-0.054016113,0.03149414,0.009963989,0.0231781,0.012008667,0.04071045,0.016220093,0.02130127,0.042053223,0.010696411,-0.016494751,-0.06982422,0.015174866,-0.052734375,0.0021324158,0.012588501,-0.025497437,-0.006706238,-0.026184082,-0.031707764,-0.03286743,-0.0021133423,-0.026397705,-0.009140015,0.019943237,-0.027130127,-0.035247803,-0.05819702,-0.018997192,0.009170532,0.06958008,0.023986816,-0.0036315918,-0.057647705,-0.006839752,0.024414062,0.0038471222,0.018188477,-0.014282227,-0.016235352,-0.016693115,-0.03161621,-0.012191772,-0.01864624,0.020019531,-0.008903503,-0.0056533813,0.031799316,-0.00037145615,0.024307251,0.004940033,0.009773254,0.02998352,-0.037872314,-0.0034427643,-0.016738892,0.037719727,0.010406494,-0.007820129,-0.052459717,0.045928955,0.016036987,0.03643799,-0.029830933,-0.0070495605,0.00012779236,0.014175415,0.014663696,-0.0127334595,-0.013381958,-0.010345459,-0.05029297,-0.06414795,0.031799316,-0.020523071,0.025558472,0.017669678,0.00068998337,0.016616821,-0.004386902,0.0019893646,0.025909424,-0.028427124,-0.0093307495,-0.025650024,-0.039520264,-0.01737976,0.0008816719,-0.011978149,0.025039673,-0.023345947,0.009788513,0.00070238113,-0.019454956,0.023880005,-0.002872467,-0.0068855286,0.020431519,0.0033130646,0.023254395,0.044128418,0.0021820068,-0.03869629,0.025650024,-0.0012273788,0.010276794,-0.019332886,0.04107666,0.030136108,-0.0054016113,0.00053596497,-0.010856628,-0.023483276,-0.024597168,-0.002401352,-0.0053520203,0.013938904,-0.003929138,-0.039367676,0.019882202,0.011077881,-0.028762817,-0.024810791,0.014793396,0.005214691,-0.03149414,0.017196655,0.022109985,0.056121826,-0.023513794,0.0026016235,0.016448975,0.030548096,0.03062439,0.010513306,-0.013282776,0.0074501038,-0.0044822693,0.015510559,0.0071983337,-0.012481689,0.016220093,-0.001036644,0.022583008,0.022979736,0.010398865,-0.01889038,-0.031066895,-0.0031547546,-0.008049011,-0.022277832,0.015571594,0.02116394,0.02104187,-0.022155762,0.02519226,0.016357422,-0.016357422,-0.016326904,-0.009841919,0.029907227,-0.0206604,-0.030395508,0.016601562,0.0063323975,0.03817749,-0.05596924,-0.0099487305,0.010643005,0.022903442,-0.030014038,-0.03326416,-0.0501709,0.0005373955,0.036132812,0.018035889,0.025054932,0.03289795,-0.005367279,0.0020446777,0.028427124,0.005580902,-0.0154800415,-0.01966858,-0.041290283,-0.0119018555,-0.0050468445,-0.0037574768,-0.033294678,0.010307312,-0.014045715,-0.024978638,0.009239197,-0.007663727,-0.007118225,-0.0074691772,0.011909485,0.03378296,-0.0046081543,0.013252258,-0.023025513,-0.027786255,0.0012102127,0.011199951,0.012390137,-0.06011963,0.015090942,-0.018035889,0.0018138885,-0.0035991669,0.010986328,0.02279663,0.03390503,0.011016846,0.030136108,-0.049865723,0.038726807,-0.030944824,0.013023376,0.014411926,-0.03994751,-0.0029182434,-0.028869629,-0.014831543,0.044128418,-0.023895264,-0.012176514,-0.025802612,-0.03652954,-0.01525116,-0.049987793,0.015289307,0.046722412,0.040771484,-0.03543091,0.0066490173,-0.0085372925,0.0009765625,-0.0154418945,0.0060691833,-0.011779785,0.012542725,0.021865845,0.015197754,-0.030166626,-0.026351929,-0.025314331,0.00088357925,-0.04486084,-0.044921875,-0.020141602,0.003572464,-0.007873535,-0.014099121,-0.039245605,-0.027542114,0.0006227493,-0.04434204,0.010894775,0.008506775,0.022506714,0.0059890747,-0.013198853,0.002620697,0.018310547,-0.009864807,0.0368042,0.01625061,-0.009605408,-0.04626465,0.012199402,0.031677246,0.020767212,0.0017118454,0.00093126297,0.00019180775,-0.016479492,-0.058410645,-0.007003784,-0.010665894,-0.004928589,-0.009597778,0.006828308,-0.049987793,-0.004081726,-0.015533447,-0.0007658005,0.025405884,0.029022217,0.01007843,-0.006046295,0.0124435425,0.0010147095,-0.026062012,-0.029754639,0.030349731,0.010231018,0.001783371,0.020080566,0.04940796,0.017944336,-0.02734375,0.008300781,0.009628296,0.010719299,-0.018127441,0.006626129,-0.018997192,0.005630493,-0.014564514,-0.016540527,-0.034362793,-0.008842468,0.088378906,-0.000025570393,-0.012962341,-0.016311646,-0.020401001,0.023880005,0.028915405,-0.038269043,0.002922058,-0.026931763,0.015686035,-0.027114868,0.012954712,0.010292053,0.02835083,-0.012329102,-0.056030273,-0.018447876,0.0006351471,-0.014831543,-0.060272217,-0.020553589,-0.074157715,-0.0025348663,-0.004184723,-0.022521973,0.0034599304,0.010566711,-0.018951416,-0.08441162,0.0014514923,0.03677368,0.00730896,0.0287323,-0.019302368,0.017150879,0.02444458,-0.026611328,-0.014213562,0.031463623,-0.028121948,-0.0020103455,-0.026870728,0.017120361,-0.019210815,-0.017425537,0.017044067,0.0073394775,0.017486572,-0.018035889,0.007423401,-0.0048332214,0.019638062,-0.017425537,0.02015686,-0.0049591064,-0.014411926,0.030807495,-0.045776367,0.023376465,0.023712158,-0.0029945374,0.014411926,0.027008057,0.03579712,-0.03753662,-0.009101868,0.025482178,0.015640259,0.046020508,-0.020080566,0.042816162,0.022583008,-0.02166748,0.028945923,-0.0019235611,-0.02027893,-0.041656494,-0.024673462,0.03010559,-0.011604309,0.021759033,-0.015655518,0.013320923,0.01235199,-0.0014858246,0.014923096,-0.007282257,-0.029876709,-0.020492554,0.0016555786,0.005832672,0.0055999756,-0.0015707016,0.022598267,0.022216797,0.041931152,0.008392334,-0.009185791,0.006450653,0.024475098,-0.011207581,0.013015747,0.02558899,0.004508972,0.013641357,0.026504517,0.013000488,-0.044158936,-0.010910034,-0.026641846,-0.007820129,0.003566742,-0.00095653534,-0.013183594,-0.011764526,-0.008003235,-0.007774353,-0.03744507,0.006286621,-0.02671814,-0.020965576,-0.00945282,-0.012428284,0.021347046,0.014289856,0.012374878,0.028762817,0.00015985966,0.047698975,0.010917664,-0.006565094,0.031677246,0.034454346,0.016601562,-0.029647827,-0.0012302399,-0.012321472,0.0008544922,-0.000647068,-0.03189087,0.012054443,0.041107178,-0.018173218,0.012168884,-0.00039076805,0.030517578,-0.007396698,-0.0012950897,-0.0056152344,0.014190674,-0.009689331,0.026062012,-0.0473938,0.009246826,0.018997192,-0.0040245056,-0.0034980774,-0.00806427,-0.026824951,0.018051147,0.010559082,-0.010360718,0.052246094,-0.0006079674,0.02607727,-0.037139893,-0.009361267,0.0047683716,-0.036743164,-0.02319336,0.032287598,0.0016078949,-0.0018253326,0.015823364,-0.030471802,0.034698486,-0.02796936,0.021987915,-0.0017156601,0.0060043335,-0.014549255,-0.027709961,-0.01701355,-0.018737793,-0.015975952,-0.009284973,-0.0018997192,0.04949951,0.0095825195,0.028457642,0.050933838,0.005580902,0.0038700104,-0.03338623,-0.038330078,0.00088500977,-0.016860962,0.011810303,-0.015670776,0.059020996,0.050476074,0.0008239746,0.035827637,0.03540039,0.033172607,0.0068473816,0.0027065277,-0.012626648,0.009925842,-0.011680603,0.016189575,0.00041007996,0.045288086,-0.036621094,0.033172607,0.014808655,0.0335083,-0.029571533,0.029464722,0.057373047,0.012672424,-0.0143585205,0.0418396,-0.008651733,-0.014228821,-0.017807007,-0.021347046,0.05557251,0.00894165,0.06378174,0.041503906,0.012489319,-0.0079193115,0.02458191,-0.030136108,-0.027130127,0.07299805,0.018661499,-0.026977539,-0.007701874,-0.005027771,0.0018434525,-0.049713135,-0.024627686,0.022720337,-0.0047912598,0.009689331,-0.0044937134,-0.00008893013,-0.011886597,0.013221741,0.021224976,0.01637268,-0.017700195,0.030838013,0.034210205,0.00749588,0.022033691,-0.0042495728,0.027877808,-0.020858765,-0.019363403,0.017150879,0.0231781,-0.0124053955,-0.0049858093,0.018203735,0.0072288513,0.051879883,0.050109863,-0.019607544,0.005126953,0.0362854,0.013153076,-0.007965088,0.05105591,0.03302002,0.012741089,0.047607422,0.035095215,0.032226562,-0.03918457,0.017730713,0.005554199,0.0047721863,-0.015571594,-0.008552551,0.0034179688,-0.013008118,0.028305054,-0.004508972,-0.016677856,0.02331543,0.026428223,-0.0010881424,-0.00034546852,-0.009979248,0.010559082,-0.01966858,0.0036830902,0.017303467,-0.014793396,0.03564453,0.012619019,0.026260376,-0.026641846,0.028198242,-0.011024475,-0.0085372925,-0.008926392,0.019210815,-0.03945923,0.004055023,-0.0053863525,-0.00007665157,-0.045562744,0.016357422,0.029205322,-0.014976501,0.025772095,0.0042686462,-0.00010740757,0.007030487,0.02293396,0.0045204163,-0.0020275116,-0.0069007874,-0.019439697,0.038116455,0.045928955,0.001704216,0.021133423,-0.012680054,-0.0013570786,0.008644104,-0.0034046173,-0.013435364,-0.025543213,-0.019821167,-0.03439331,0.013504028,0.037322998,0.026535034,0.039031982,-0.0032157898,-0.012275696,0.008369446,0.03338623,0.009864807,0.0028076172,-0.010597229,0.021881104,-0.015716553,0.047058105,0.04260254,0.0044937134,0.028915405,-0.014793396,-0.024841309,0.008453369,-0.0011053085,0.025238037,-0.014411926,0.006866455,-0.009239197,0.025650024,-0.025100708,-0.03817749,0.0042533875,-0.015182495,-0.014587402,-0.029663086,0.016311646,0.0046958923,0.0390625,0.04397583,0.011505127,-0.027267456,0.06378174,-0.02168274,0.04574585,-0.00762558,-0.008308411,0.05596924,0.0340271,0.03552246,0.027130127,0.020950317,-0.03945923,0.018753052,0.04208374,0.017181396,0.0082473755,-0.008285522,-0.015991211,0.036499023,0.000032663345,0.022094727,-0.01953125,-0.0032691956,0.010520935,-0.00762558,-0.006000519,-0.0026721954,-0.006000519,0.0020980835,0.039093018,-0.030273438,-0.018722534,-0.026107788,-0.012924194,0.033569336,-0.009101868,0.0033779144,0.0053520203,-0.033721924,0.018035889,-0.033996582,-0.017547607,0.005306244,0.028167725,-0.041229248,-0.017044067,-0.0013360977,0.00907135,-0.020111084,0.025939941,0.023590088,0.0022087097,0.0049057007,0.045776367,-0.012138367,0.03881836,-0.022750854,0.015220642,0.026138306,0.0058288574,-0.009262085,0.007423401,0.009750366,-0.016571045,0.015136719,0.03677368,-0.010818481,0.008377075,-0.001783371,-0.00919342,0.01109314,0.002128601,0.00051641464,-0.0006389618,-0.010223389,-0.0134887695,0.004547119,0.0042648315,-0.0028457642,0.00806427,-0.013191223,-0.012771606,0.014007568,0.044647217,0.019485474,-0.03894043,0.0056877136,0.008773804,0.0115356445,-0.018798828,-0.009307861,-0.0010509491,-0.029464722,0.020904541,0.011817932,0.007320404,0.0104599,-0.018127441,-0.0049095154,0.022415161,0.016860962,0.02015686,0.0063934326,-0.0037117004,0.014381409,-0.021850586,-0.0034103394,-0.007888794,-0.0033779144,0.011672974,0.021606445,-0.0041503906,-0.033599854,0.03353882,-0.006641388,0.014450073,0.005794525,-0.008964539,0.013969421,-0.019729614,-0.005344391,0.005924225,0.0104599,-0.011260986,-0.017166138,-0.012779236,0.025177002,0.05380249,-0.015342712,0.0014514923,0.023376465,0.0084991455,0.019134521,0.033935547,0.011581421,0.03866577,0.027938843,-0.017974854,-0.02128601,0.018585205,-0.0073394775,-0.033294678,0.020095825,-0.011604309,-0.009475708,0.013267517,0.010719299,-0.004589081,-0.027618408,-0.019256592,-0.011459351,-0.020843506,0.01966858,-0.010040283,0.01776123,-0.024414062,-0.013320923,-0.0010490417,-0.021270752,-0.040100098,-0.025344849,0.0055885315,-0.011131287,-0.04650879,0.01675415,-0.033233643,0.011047363,-0.01687622,-0.0025959015,-0.016784668,0.029174805,-0.015899658,-0.00566864,0.006668091,0.024780273,0.01751709,0.010414124,0.02532959,-0.028015137,-0.030441284,-0.022659302,-0.002746582,-0.008255005,0.02319336,0.0011367798,0.033843994,0.021209717,-0.008651733,0.001367569,-0.012184143,-0.0060272217,-0.0065841675,-0.020370483,-0.016998291,0.02229309,0.0061149597,-0.008132935,-0.008476257,0.036315918,-0.03390503,-0.019760132,0.023895264,0.04751587,0.008872986,0.029586792,-0.015838623,-0.0044517517,-0.0070610046,0.0023517609,-0.018508911,0.016571045,0.005973816,0.0059394836,-0.010383606,-0.002090454,0.02760315,-0.00038290024,-0.00894165,0.017868042,-0.0008416176,-0.0058174133,0.036621094,0.013954163,0.0042800903,-0.007041931,-0.0135650635,0.024414062,0.03817749,0.016433716,0.003004074,-0.0029258728,0.014190674,-0.017456055,0.010955811,0.022232056,-0.01461792,-0.034301758,-0.015144348,-0.036987305,0.012680054,0.0024700165,0.0134887695,-0.012207031,0.015731812,-0.026931763,-0.031097412,-0.014694214,0.022247314,0.01259613,-0.010223389,-0.011238098,0.0028972626,0.01878357,-0.023910522,-0.0033035278,-0.04925537,-0.037322998,-0.005138397,-0.022216797,0.013938904,0.013252258,-0.0098724365,-0.000028908253,0.00039434433,0.00068616867,-0.0048446655,0.027008057,-0.018478394,-0.011413574,0.022079468,0.016571045,-0.023406982,0.010475159,-0.0075798035,-0.0018529892,0.015289307,-0.004753113,0.0063705444,-0.0030536652,0.037139893,-0.00762558,-0.010032654,0.030441284,0.004508972,0.0138549805,-0.028839111,0.010757446,0.00030088425,-0.002565384,0.03729248,-0.030319214,-0.02331543,0.011993408,-0.018234253,-0.027679443,0.0014705658,0.020446777,0.03729248,-0.011978149,0.042785645,-0.014823914,-0.015434265,0.02128601,0.010025024,-0.014450073,0.0028018951,0.03289795,0.0065193176,-0.01386261,-0.005809784,-0.011878967,-0.036315918,-0.009109497,0.014305115,-0.0104522705,-0.015304565,0.015068054,0.005344391,0.04135132,-0.0028381348,0.018249512,0.015510559,0.011077881,0.026565552,0.008834839,0.041107178,-0.0019397736,-0.027282715,0.009033203,0.0036144257,-0.0181427,-0.0064201355,-0.0059013367,0.00062036514,-0.040771484,0.0059432983,-0.0031490326,0.03567505,-0.01939392,0.0135269165,-0.019058228,0.0020713806,-0.035186768,-0.014663696,-0.023284912,0.01499176,0.024353027,0.0036087036,0.025634766,0.0003273487,-0.028045654,0.01096344,0.041259766,-0.0082473755,-0.023849487,-0.011634827,0.009490967,-0.0015630722,0.006164551,0.008232117,-0.012214661,-0.029724121,0.0046920776,-0.023406982,0.009208679,-0.0093688965,0.010612488,0.004211426,-0.003080368,0.0025577545,0.028396606,-0.0008072853,-0.008552551,0.009017944,0.009895325,0.03744507,0.032196045,-0.014190674,0.022918701,0.02507019,-0.03591919,0.057434082,-0.0050201416,0.025283813,-0.01461792,-0.005756378,-0.041137695,-0.020858765,-0.018341064,0.0013494492],"createdAt":"2026-04-18T18:50:55.038Z","updatedAt":"2026-04-23T09:31:18.232Z","lastSeenAt":"2026-04-23T09:31:18.232Z","tsv":"'/api':187 '/api/v1/payments/52':98 '/docs':186 '/pricing':188 '/readme':190 '0.02':12,28,72,149,175,178 '000':170 '20':169 'Base network API' 'USDC API access' 'accept':160 'access':7,23,40,106 'ai':60 'analysi':133 'analyt':59 'api':6,22,39,86,105 'avail':216 'awar':224 'base':9,25,82,171,180 'base-network' 'bodi':233 'call':4,20 'categori':68 'challeng':154 'clarifi':113 'classif':136 'commit':94 'confirm':155 'connect':196 'crawl':109,219 'crypto-paid API' 'data':58,115 'detail':203 'document':181,227 'embed':137 'endpoint':34,51,97,129,157,235 'exampl':215 'exchang':140 'expect':236 'extrem':183 'feed':139 'financ':63 'function':117 'geocod':142 'i.e':177 'infrastructur':66 'key':87 'land':125 'learn':62 'limit':90 'list':100,127 'live':159 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':61 'mani':50 'materi':110 'maximum':166 'micropayment API' 'network':83 'no-api-key' 'offer':52 'one':48 'openapi':207 'page':126,191 'particular':119 'pay':2,18 'pay-per-cal':1,17 'pay-per-call' 'pay-per-request API' 'payment':44,75,167 'per':3,13,19,29,73 'platform':55,123 'point':151 'post':161 'post-endpoint' 'premium':5,21,38,104 'price':70,138,150 'prompt':198 'prospect':220 'protocol':45 'provid':37 'rate':89,141 'render':193 'request':14,30,74,162,232 'request/response':210 'requir':84,164 'respons':239 'return':121,241 'rout':120 'schema':211 'sentiment':132 'settl':77 'span':57 'spars':184 'spec':208 'specif':96 'summar':135 'technic':202 'text':134 'titl':103 'unclear':230 'unit':172 'upfront':93 'usag':214 'usdc':16,32,79,174,176 'usdc-settlement' 'user':221 'util':67 'via':10,26,41 'wallet':197 'web3':64 'without':226 'x402':11,27,43,153 'x402 API' 'x402-payment'","prices":[{"id":"2e4001bc-7b49-4391-aa0f-ac08558ec8ca","listingId":"785ef7a2-2f2e-4c7b-8cce-d42c5447bd6e","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:55.038Z"}],"sources":[{"listingId":"785ef7a2-2f2e-4c7b-8cce-d42c5447bd6e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:55.038Z","lastSeenAt":"2026-04-23T09:31:18.232Z"}],"details":{"listingId":"785ef7a2-2f2e-4c7b-8cce-d42c5447bd6e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/52 \\\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":"Endpoint returns HTTP 402 with x402 challenge, maxAmountRequired 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/52"},{"claim":"Platform lists $0.02 per request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/52"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Exploring x402 protocol integration for pay-as-you-go service consumption"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Users who want no-signup, no-API-key access to paid endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring high-throughput batch processing with predictable billing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.671Z"},"updatedAt":"2026-04-23T09:31:18.232Z"}}