{"id":"b4596e77-8657-4d35-b477-81f5c7e6af35","shortId":"rAmC9N","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a collection of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share the same pricing model: $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/353` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header with each request. The x402 challenge confirms the endpoint is live, accepts the \"exact\" payment scheme, requires up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and returns application/json.\n\nBecause the crawled documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" prompt with no further content, the actual request/response schema for this specific endpoint is unknown. The platform lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, geocoding, and more — all at the same $0.02 price point — but no OpenAPI spec or detailed documentation was found for any of them.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","json-response"],"categories":["general","infrastructure"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API","402 payment endpoint"],"warnings":["No OpenAPI spec or detailed documentation available for this endpoint","The exact functionality of /api/v1/charges/353 ('Premium API Access') is undocumented — it is unclear what data or service it provides","All docs/pricing/README pages resolve to a minimal 'Connect wallet' prompt with no substantive content","Sibling endpoints on the platform are similarly undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/353","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/charges/353","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 pricing and payment details. However, there is no OpenAPI spec, no documentation beyond a landing page listing, and no information about what this specific endpoint actually does or what its request/response schemas look like. The \"Premium API Access\" label is generic and uninformative.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T03:49:55.423Z","embedding":[-0.011756897,-0.040527344,0.0395813,0.013420105,0.024658203,-0.026947021,-0.021240234,0.0385437,0.066711426,-0.064941406,0.04360962,-0.035827637,-0.030914307,-0.014709473,-0.026855469,0.0042037964,-0.009292603,0.0058898926,-0.05645752,0.039215088,0.037109375,-0.016448975,-0.013168335,0.03286743,0.005718231,-0.028579712,0.004142761,-0.009376526,-0.01436615,-0.02760315,0.017913818,-0.026489258,-0.0037326813,0.022994995,-0.0028266907,-0.014640808,-0.02230835,0.03692627,0.032562256,-0.009941101,0.0033340454,-0.05996704,-0.0050582886,0.012176514,-0.049926758,-0.0154418945,0.01461792,-0.01838684,-0.02633667,-0.003320694,-0.033477783,-0.0013513565,-0.015388489,0.0053749084,0.015640259,0.0066986084,-0.018676758,-0.01524353,0.016525269,0.0069084167,-0.0029525757,-0.07110596,-0.0158844,0.006439209,0.010765076,0.04574585,-0.006008148,0.046173096,0.008598328,0.051757812,0.03503418,0.049316406,0.031677246,-0.000037431717,0.013031006,-0.007637024,0.0066986084,0.052886963,-0.007194519,-0.012336731,-0.01727295,-0.003572464,-0.03314209,-0.007881165,-0.017471313,-0.056427002,-0.013412476,0.01878357,-0.02178955,0.028656006,-0.07922363,-0.009811401,-0.016647339,0.00920105,0.0013933182,0.008163452,-0.0042152405,0.0068359375,-0.0059280396,0.009857178,0.01979065,-0.040496826,0.021194458,0.028259277,0.049743652,0.04724121,0.022094727,0.032592773,-0.0039711,-0.026275635,-0.015945435,0.010734558,-0.022583008,-0.02027893,0.019973755,0.0102005005,-0.022476196,0.017684937,-0.036193848,0.024276733,-0.059143066,0.057617188,0.036071777,-0.019363403,0.017211914,-0.04196167,-0.014312744,-0.0065841675,-0.03152466,-0.014434814,0.017578125,0.009895325,0.031402588,-0.030151367,-0.026565552,0.0071105957,-0.016998291,-0.028945923,-0.049438477,-0.028945923,0.033843994,-0.031829834,0.021820068,0.03744507,-0.08306885,-0.009719849,-0.04837036,0.004486084,-0.030914307,-0.002199173,-0.0028572083,0.032592773,-0.019882202,-0.005756378,-0.01158905,-0.018798828,-0.008872986,0.039764404,-0.0090408325,0.038604736,-0.0008234978,0.02708435,0.020477295,-0.002904892,0.014526367,0.033111572,0.0034313202,-0.07684326,-0.083496094,-0.031204224,-0.013259888,-0.01626587,-0.04751587,-0.009750366,-0.01058197,-0.0914917,-0.034057617,-0.006980896,0.0023326874,-0.016815186,-0.0046806335,-0.028442383,0.01576233,-0.018417358,-0.054626465,-0.013999939,-0.023590088,0.0635376,0.020065308,0.017318726,0.018051147,-0.015182495,0.058258057,0.024810791,-0.023788452,-0.033325195,0.023651123,-0.0050354004,0.031280518,0.0038414001,0.0062217712,-0.025772095,0.044433594,0.05380249,0.017578125,-0.013458252,0.0031223297,-0.052886963,-0.041137695,-0.037200928,0.007194519,0.010612488,-0.0037021637,0.037963867,-0.036346436,-0.025650024,-0.001414299,0.0011472702,0.023666382,0.060333252,0.0077934265,-0.0048065186,0.0154953,0.018478394,-0.056152344,0.039794922,0.024932861,0.017486572,-0.020965576,-0.024841309,0.02949524,0.03677368,-0.047424316,0.004108429,-0.025985718,0.014457703,-0.0011920929,0.0060920715,0.032562256,-0.025878906,-0.036468506,-0.026138306,-0.0028495789,0.033966064,0.015510559,-0.03677368,-0.048919678,-0.08343506,0.04763794,0.043914795,0.020858765,-0.00060272217,0.013931274,-0.031951904,-0.00970459,-0.07647705,0.047790527,0.076660156,-0.0090408325,-0.024429321,0.032318115,-0.019424438,-0.03314209,-0.012016296,-0.0011711121,-0.0287323,-0.030700684,0.01789856,-0.043792725,0.010551453,0.010253906,0.026367188,0.06072998,-0.010375977,-0.048858643,-0.027816772,0.0068206787,0.002916336,-0.017929077,-0.0016975403,-0.009742737,0.025131226,0.034942627,-0.012016296,0.02319336,0.010009766,0.025283813,-0.0030593872,-0.011566162,-0.027420044,-0.020614624,0.022033691,-0.0038795471,-0.08282471,0.015533447,0.0010614395,0.058410645,-0.042755127,0.05456543,-0.0077552795,0.0066490173,0.057037354,-0.014129639,-0.048828125,0.0018053055,0.031021118,0.038269043,0.04272461,0.019088745,-0.011024475,-0.010467529,0.060516357,-0.02128601,0.0003786087,0.015296936,0.014770508,0.02909851,0.0032615662,-0.06958008,-0.039733887,-0.009559631,-0.022705078,0.032928467,-0.02079773,0.03677368,-0.020202637,0.0051612854,-0.020690918,0.007457733,-0.035186768,0.018661499,-0.01600647,0.01449585,-0.012916565,-0.02180481,0.013763428,0.01889038,-0.020050049,0.001578331,0.03152466,0.02859497,-0.018173218,-0.04031372,-0.024429321,-0.014389038,0.009223938,0.019104004,0.018722534,0.020355225,0.030807495,-0.02960205,0.01234436,0.025817871,0.011924744,0.035369873,-0.0141067505,0.013038635,-0.050048828,-0.049987793,-0.009414673,-0.046875,0.029388428,0.022094727,0.020507812,0.042907715,0.0034236908,-0.015220642,-0.021865845,0.039001465,-0.050994873,0.004497528,0.028289795,-0.002878189,-0.04537964,-0.0010032654,0.014511108,-0.0009160042,0.037597656,0.007331848,0.003446579,0.057922363,0.04623413,0.004901886,0.018844604,0.014144897,0.024612427,-0.003332138,-0.030853271,-0.027999878,-0.0034675598,0.020553589,-0.017807007,-0.024368286,-0.0791626,0.05307007,0.03253174,0.08331299,0.016571045,0.012809753,0.030303955,-0.013259888,0.018814087,-0.024169922,-0.01537323,-0.032104492,-0.040405273,0.018829346,-0.019134521,-0.0073127747,-0.023773193,0.040771484,0.027160645,0.009506226,-0.033447266,0.0513916,0.010116577,-0.01651001,0.028442383,0.009941101,0.054351807,0.06213379,-0.054840088,0.02420044,0.022216797,-0.028961182,-0.0040626526,0.050201416,0.0019073486,-0.015274048,-0.07354736,-0.027450562,-0.008705139,-0.013999939,-0.07562256,-0.000117361546,0.0023021698,0.016799927,0.009918213,-0.0077209473,-0.038635254,-0.007610321,-0.019577026,-0.05883789,-0.004760742,-0.03894043,0.010948181,0.038269043,-0.020477295,-0.00056648254,0.0032138824,-0.0054397583,-0.012084961,0.012199402,-0.0074310303,-0.010032654,-0.061706543,0.028182983,0.0014390945,0.017425537,0.013076782,0.02822876,0.034820557,0.0076942444,0.051818848,0.019744873,-0.008255005,-0.060821533,0.013175964,-0.03942871,0.009376526,-0.001750946,-0.020629883,-0.009414673,-0.019119263,-0.027053833,-0.025375366,0.0043678284,-0.030853271,0.013267517,0.01763916,-0.038604736,-0.036102295,-0.06921387,-0.016433716,0.00085020065,0.06750488,0.030517578,-0.005947113,-0.057617188,-0.024017334,0.034484863,0.0055274963,0.004688263,-0.014732361,-0.017044067,-0.0075683594,-0.034973145,-0.0211792,-0.019699097,0.026306152,-0.011947632,-0.006164551,0.027999878,-0.004989624,0.01713562,0.0008583069,0.011932373,0.032470703,-0.0289917,-0.008857727,-0.022857666,0.02217102,-0.001616478,-0.011001587,-0.04336548,0.04345703,0.016708374,0.04626465,-0.038482666,0.009109497,-0.0036697388,0.013694763,0.021255493,-0.01524353,-0.011123657,0.0043296814,-0.047607422,-0.0848999,0.023651123,-0.030197144,0.024093628,0.0042686462,0.008811951,0.03466797,-0.0051002502,0.013404846,0.029129028,-0.027313232,-0.006965637,-0.018875122,-0.04107666,-0.0026168823,0.0038528442,-0.006439209,0.022064209,-0.014457703,0.009529114,-0.018737793,-0.019439697,0.03451538,0.0064582825,-0.0035552979,0.023605347,0.00642395,0.017990112,0.05493164,0.010932922,-0.036071777,0.021011353,0.001045227,0.0013914108,-0.014823914,0.038330078,0.015571594,-0.02507019,-0.009002686,0.0016975403,-0.011856079,-0.025741577,-0.009284973,0.00995636,0.031219482,0.00844574,-0.039611816,0.01977539,0.022964478,-0.025405884,-0.006652832,0.019195557,0.024795532,-0.033935547,0.027862549,0.01763916,0.055633545,-0.026168823,-0.0041618347,0.010368347,0.021621704,0.016860962,0.022460938,-0.012466431,0.013305664,-0.0116119385,0.003967285,-0.011192322,-0.014801025,0.011276245,-0.013641357,0.0015735626,0.024597168,0.014785767,-0.015129089,-0.019958496,0.015716553,-0.0005979538,-0.0184021,0.025405884,0.013687134,0.013931274,-0.020706177,0.020553589,0.01084137,-0.034942627,-0.020492554,-0.0038414001,0.04244995,-0.018005371,-0.013031006,0.019927979,0.0014591217,0.024230957,-0.055419922,-0.007881165,0.0061416626,0.020431519,-0.020065308,-0.046722412,-0.033355713,0.0009160042,0.03439331,0.007167816,0.013893127,0.03677368,-0.007457733,0.01423645,0.021850586,0.000099122524,-0.011962891,-0.014762878,-0.050231934,-0.009597778,-0.015388489,-0.010551453,-0.030273438,0.008926392,-0.018417358,-0.03479004,0.0023918152,-0.020080566,-0.0027885437,-0.009155273,0.0149002075,0.03479004,0.00642395,0.00541687,-0.014732361,-0.018630981,0.012672424,-0.0020656586,0.028656006,-0.042633057,0.005115509,-0.018569946,-0.0027160645,-0.01890564,0.009391785,0.025970459,0.02357483,0.0036239624,0.034423828,-0.049346924,0.03994751,-0.022155762,0.019165039,0.004924774,-0.039215088,-0.0107803345,-0.035827637,-0.014572144,0.031173706,-0.02017212,0.000038027763,-0.02407837,-0.024459839,-0.005683899,-0.047698975,0.017929077,0.033233643,0.038635254,-0.0289917,-0.0016498566,0.0067710876,-0.0068740845,-0.00579834,0.00472641,-0.019241333,0.018707275,0.019134521,0.012748718,-0.019958496,-0.025268555,-0.010894775,-0.00034737587,-0.0546875,-0.042755127,-0.02192688,0.017288208,-0.017501831,-0.008041382,-0.020187378,-0.02116394,-0.0004107952,-0.028182983,0.008293152,0.0077400208,0.021102905,0.0076828003,-0.016983032,-0.0003914833,0.017593384,-0.018600464,0.032562256,0.0057678223,-0.010925293,-0.037353516,-0.00070619583,0.03994751,0.018066406,-0.00010174513,-0.013053894,-0.002084732,-0.01398468,-0.0574646,0.00012803078,-0.0035972595,0.0017051697,0.0043029785,0.0010051727,-0.050109863,-0.009521484,-0.02305603,-0.005748749,0.025970459,0.024673462,0.016159058,-0.0023345947,0.007144928,-0.00932312,-0.01222229,-0.037994385,0.025939941,0.010787964,-0.004673004,0.012809753,0.033813477,0.003967285,-0.019927979,-0.001294136,0.005092621,0.016860962,-0.024536133,0.011871338,-0.013435364,0.014205933,-0.005672455,-0.007911682,-0.034606934,-0.0099487305,0.07928467,-0.0017347336,-0.011184692,-0.00843811,-0.013687134,0.016418457,0.0206604,-0.054107666,-0.0063552856,-0.030044556,0.018844604,-0.017807007,0.019805908,0.00091838837,0.0132751465,-0.03036499,-0.06549072,-0.0065460205,0.017807007,-0.0057678223,-0.055633545,-0.017318726,-0.053833008,-0.0079956055,-0.0063667297,-0.019088745,0.003042221,0.0073013306,-0.022262573,-0.083984375,0.018661499,0.0491333,0.004901886,0.02720642,-0.01927185,0.011146545,0.026062012,-0.018569946,-0.010688782,0.023162842,-0.021102905,-0.020965576,-0.025772095,0.023513794,-0.021987915,-0.019058228,0.021011353,0.01725769,0.014533997,-0.0068893433,0.019134521,-0.0006456375,0.020065308,-0.01335907,0.01071167,-0.0067634583,-0.01121521,0.03277588,-0.045684814,0.028869629,0.011772156,-0.002922058,-0.0034332275,0.025650024,0.035003662,-0.041259766,-0.016220093,0.041229248,0.00459671,0.041870117,-0.037475586,0.052825928,0.022521973,-0.013160706,0.013259888,-0.017913818,-0.03652954,-0.030090332,-0.03527832,0.020980835,0.012397766,0.024459839,-0.008422852,0.008171082,0.02949524,-0.0016078949,0.0006303787,-0.011672974,-0.014022827,-0.008857727,0.01083374,-0.0038108826,0.0037784576,-0.00018823147,0.020568848,0.01209259,0.05303955,0.0035514832,-0.012451172,0.01259613,0.018875122,-0.022628784,0.01133728,0.013710022,0.014762878,0.030410767,0.018600464,0.010482788,-0.029205322,-0.021072388,-0.01965332,-0.0013008118,0.012130737,0.00006771088,-0.0027694702,-0.004337311,0.000096321106,-0.002609253,-0.042938232,0.0135269165,-0.030731201,-0.014968872,0.0025920868,-0.008460999,0.012260437,0.016311646,-0.0012702942,0.02015686,0.001294136,0.058654785,-0.0030136108,-0.0006222725,0.025512695,0.035095215,0.015113831,-0.03564453,-0.008277893,-0.0016756058,-0.0064048767,0.0077056885,-0.01940918,0.02305603,0.046875,-0.012245178,0.016601562,-0.019134521,0.018737793,-0.0007777214,0.016983032,-0.0042266846,0.005924225,-0.013824463,0.031555176,-0.051879883,0.0056419373,0.022140503,0.00044083595,-0.014549255,-0.027755737,-0.029708862,0.009147644,0.010299683,-0.014602661,0.050231934,-0.006755829,0.02619934,-0.02645874,-0.022140503,0.01826477,-0.034820557,-0.013877869,0.03643799,-0.0022697449,-0.004760742,0.017700195,-0.025268555,0.034301758,-0.03933716,0.007286072,0.0022296906,-0.0028839111,-0.013381958,-0.024505615,-0.021911621,-0.01424408,-0.008613586,0.0050849915,-0.0065345764,0.03668213,0.02609253,0.031143188,0.04034424,0.022506714,0.01222229,-0.03933716,-0.027450562,0.00003170967,-0.03491211,0.02607727,-0.010276794,0.040740967,0.042114258,-0.007358551,0.036865234,0.042053223,0.033569336,0.0042648315,0.013587952,-0.01940918,0.0072288513,-0.0050582886,0.030853271,0.006717682,0.04498291,-0.028289795,0.010513306,0.00056791306,0.024215698,-0.03048706,0.01838684,0.07128906,0.018203735,-0.009757996,0.038269043,-0.00995636,-0.023544312,-0.018417358,-0.012145996,0.06640625,0.021621704,0.048736572,0.041625977,0.013916016,-0.02268982,0.013710022,-0.026046753,-0.048187256,0.06982422,0.027526855,-0.025390625,-0.011077881,-0.0064048767,0.008804321,-0.05505371,-0.021606445,0.02633667,0.00045514107,0.011177063,-0.012512207,-0.0064849854,-0.015319824,0.024841309,0.009986877,0.017242432,-0.018127441,0.03378296,0.019332886,0.018295288,0.022750854,0.006652832,0.021087646,-0.025482178,-0.009429932,0.007484436,0.022918701,-0.008422852,-0.0007443428,0.02255249,0.013511658,0.050201416,0.03994751,-0.016540527,-0.00491333,0.03326416,0.019882202,-0.0011644363,0.04348755,0.027709961,0.017211914,0.03640747,0.038330078,0.029678345,-0.038482666,0.018600464,-0.004699707,0.010551453,0.0013132095,-0.016708374,0.009460449,-0.013366699,0.016723633,-0.001821518,-0.01928711,0.031341553,0.027496338,-0.006515503,0.00233078,-0.0031642914,0.0024604797,-0.0069007874,0.009269714,0.0072746277,-0.02166748,0.024230957,0.010566711,0.036315918,-0.026550293,0.01902771,0.0005674362,-0.02243042,-0.013153076,0.0047035217,-0.0435791,-0.0035152435,-0.0024299622,-0.009628296,-0.037872314,0.006336212,0.012138367,-0.0062294006,0.028335571,0.008071899,0.0018987656,-0.007255554,0.019882202,0.017440796,-0.0044822693,-0.015258789,-0.014770508,0.035247803,0.04824829,-0.001964569,0.0093307495,-0.022750854,-0.005001068,0.004634857,-0.000415802,-0.00076055527,-0.012184143,-0.012786865,-0.030380249,0.017471313,0.045684814,0.019302368,0.041870117,-0.011459351,-0.016159058,0.00041127205,0.022125244,0.0027160645,0.0034542084,-0.0038375854,0.029129028,-0.007419586,0.043518066,0.039245605,-0.0022506714,0.03363037,-0.018005371,-0.007873535,0.008712769,-0.016525269,0.03390503,-0.012268066,0.011833191,-0.021102905,0.02456665,-0.025009155,-0.02658081,0.0012893677,-0.020568848,-0.009521484,-0.026779175,0.0034828186,0.0050086975,0.018859863,0.034362793,0.018569946,-0.025772095,0.06451416,-0.009338379,0.043701172,-0.0051193237,-0.0024795532,0.048339844,0.041900635,0.037261963,0.026733398,0.012893677,-0.027236938,0.013931274,0.040924072,0.028305054,0.012420654,0.0032901764,-0.007881165,0.028656006,-0.009284973,0.025665283,-0.010826111,-0.0032920837,0.013244629,-0.011108398,-0.006046295,0.003358841,-0.006881714,0.020812988,0.047180176,-0.027023315,-0.011207581,-0.030960083,-0.0121154785,0.03677368,-0.00037002563,0.0017251968,-0.0027999878,-0.012184143,0.010467529,-0.03540039,-0.016998291,0.0096206665,0.028045654,-0.04071045,-0.021011353,0.006965637,0.02923584,-0.031021118,0.02418518,0.031921387,-0.00844574,0.013999939,0.054351807,-0.008270264,0.04650879,-0.0024852753,0.021148682,0.03387451,0.0029678345,-0.021438599,-0.0031318665,0.010528564,-0.017303467,0.016555786,0.04031372,-0.012588501,0.01524353,0.004688263,-0.023605347,0.003686905,0.010063171,-0.015945435,0.001042366,-0.001704216,-0.0107421875,0.0016155243,0.0067634583,0.006008148,0.00049877167,0.0011892319,-0.012771606,0.013008118,0.02848816,0.008575439,-0.042510986,0.0013360977,0.016815186,0.012184143,-0.022109985,-0.020980835,-0.015045166,-0.033477783,0.022613525,0.019973755,0.014389038,0.010749817,-0.018356323,-0.0041770935,0.030807495,-0.003873825,0.017532349,0.0047721863,0.0013942719,0.012062073,-0.020935059,-0.003932953,-0.0131073,-0.0021839142,0.0007472038,0.019241333,-0.0049591064,-0.036987305,0.014564514,-0.0021266937,0.004055023,-0.00035977364,-0.01928711,0.03173828,-0.017715454,-0.009307861,0.0026397705,0.01184082,-0.008781433,-0.016052246,-0.024414062,0.027740479,0.05529785,-0.0018024445,-0.010688782,0.012161255,0.02128601,0.019500732,0.043395996,0.01373291,0.046325684,0.023010254,-0.019897461,-0.019073486,0.02859497,-0.012016296,-0.038085938,0.017944336,-0.011436462,-0.00046730042,0.019805908,0.014297485,-0.004558563,-0.025161743,-0.01776123,-0.014129639,-0.013000488,0.020599365,-0.020217896,0.014381409,-0.03186035,-0.0059661865,0.00041270256,-0.023712158,-0.030563354,-0.029647827,-0.005630493,-0.01576233,-0.046539307,0.013893127,-0.033294678,0.008049011,-0.022964478,-0.003578186,-0.011154175,0.028808594,-0.0107421875,0.0070114136,0.011016846,0.032562256,0.010627747,0.014389038,0.013877869,-0.023101807,-0.031433105,-0.014801025,-0.00048422813,-0.021408081,0.018554688,0.00070524216,0.03125,0.0077590942,0.00015807152,0.001745224,-0.0047187805,-0.0023975372,-0.0012960434,-0.04046631,-0.015991211,0.016326904,0.024871826,-0.011405945,-0.019836426,0.044799805,-0.017105103,-0.015457153,0.018035889,0.044403076,0.02116394,0.03378296,-0.022415161,-0.0025749207,-0.019241333,-0.003358841,-0.02104187,0.0053749084,0.013282776,0.0059165955,-0.0008864403,-0.0035362244,0.0181427,-0.011009216,-0.0045204163,0.021881104,0.005706787,-0.0234375,0.03768921,0.013137817,-0.0019512177,0.00038218498,-0.008865356,0.024932861,0.05105591,0.010643005,0.005142212,0.003873825,0.008323669,-0.0063285828,0.01133728,0.022094727,-0.022827148,-0.03265381,-0.019699097,-0.025924683,0.023208618,0.002576828,0.019134521,0.00003671646,0.007247925,-0.016693115,-0.025863647,-0.020812988,0.030151367,-0.004573822,-0.008178711,-0.010887146,-0.004966736,0.02142334,-0.030151367,0.004432678,-0.038085938,-0.008308411,-0.018554688,-0.02558899,0.01676941,0.007194519,-0.0066566467,0.0052719116,-0.0011234283,-0.009468079,0.0014667511,0.031066895,-0.026260376,0.0012521744,0.014183044,0.019454956,-0.028076172,0.010391235,-0.009292603,-0.0072669983,0.009666443,-0.0027446747,0.010681152,-0.020401001,0.025238037,0.0041046143,0.0007586479,0.035217285,-0.00095176697,0.009803772,-0.018569946,-0.002161026,-0.0015678406,-0.00025057793,0.035827637,-0.009246826,-0.03793335,0.016967773,-0.016326904,-0.033966064,-0.008201599,0.03414917,0.037902832,-0.019363403,0.044830322,-0.022888184,-0.009925842,0.0007882118,0.0041503906,-0.018508911,-0.00015974045,0.036834717,0.00598526,-0.004371643,0.0011024475,-0.014480591,-0.037322998,-0.017501831,0.014472961,-0.004573822,-0.017105103,0.019134521,0.011451721,0.03778076,0.0008749962,0.023284912,0.017990112,0.002035141,0.021728516,0.00333786,0.039001465,-0.008140564,-0.026168823,0.011169434,0.0057144165,-0.008666992,-0.0064048767,-0.0070266724,0.00037884712,-0.032958984,0.014274597,-0.001953125,0.037719727,-0.022354126,0.0052757263,-0.013748169,-0.0012598038,-0.0262146,-0.005180359,-0.03918457,0.014404297,0.03567505,0.014480591,0.017089844,0.0022525787,-0.021209717,0.029312134,0.054473877,-0.0038051605,-0.021224976,-0.014862061,0.013961792,0.01158905,-0.006149292,0.014732361,-0.022094727,-0.02444458,0.003479004,-0.021606445,0.0072746277,-0.013069153,0.024932861,0.009269714,-0.007446289,0.0022392273,0.029785156,0.0017089844,-0.007221222,0.0077285767,0.005344391,0.031433105,0.04083252,-0.013404846,0.01777649,0.028259277,-0.034698486,0.04260254,-0.01424408,0.025436401,-0.025848389,0.0076828003,-0.0423584,-0.015586853,-0.005569458,0.008354187],"createdAt":"2026-04-18T18:45:15.116Z","updatedAt":"2026-04-22T09:01:02.309Z","lastSeenAt":"2026-04-22T09:01:02.309Z","tsv":"'/api/v1/charges/353':107 '0.02':10,29,94,172,232 '000':166 '20':165 '402 payment endpoint' '6':176 'Base network API' 'USDC micropayment API' 'accept':157 'access':6,25,46,112,138 'actual':202 'advertis':129 'ai':76 'analysi':218 'analyt':75 'api':5,24,45,72,111,131 'application/json':180 'attach':141 'base':8,27,102,167 'base-network' 'beyond':124 'call':71 'caller':139 'challeng':116,151 'classif':221 'collect':66 'confirm':152 'connect':194 'content':200 'crawl':183 'crypto-paid API' 'data':74 'decim':177 'detail':240 'doc':186 'document':123,184,241 'embed':222 'endpoint':40,57,85,106,154,208,215 'exact':119,159 'feed':224 'financ':79 'found':243 'function':120 'gate':3,22 'geocod':225 'given':173 'header':145 'host':64 'i.e':171 'infrastructur':82 'instant':137 'json-response' 'key':16,35,132 'label':109,126 'learn':78 'limit':19,38,135 'list':213 'live':156 'lowpaymentfee' 'lowpaymentfee.com':42,61 'machin':77 'mani':56 'minim':193 'model':93 'network':103 'no-api-key' 'offer':58 'one':54 'openapi':237 'page':185 'pay':9,28,69 'pay-per-cal':68 'pay-per-call API' 'payment':50,144,160 'per':11,30,70,95 'per-request-billing' 'platform':62,88,128,212 'point':234 'premium':4,23,44,110 'price':92,187,223,233 'prompt':196 'protocol':51 'provid':43 'rate':18,37,134 'readm':188 'request':12,31,96,148 'request/response':203 'requir':162 'resolv':190 'return':179 'schema':204 'scheme':161 'sentiment':217 'settl':97 'share':89 'sibl':214 'simpli':140 'span':73 'spec':238 'specif':105,207 'summar':220 'text':219 'unit':168 'unknown':210 'usdc':14,33,99,170,174 'usdc-settlement' 'util':83 'via':47 'wallet':195 'web3':80 'x402':2,21,49,115,143,150 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"ac1d7dd0-abf0-4eb2-8456-607c19401aa1","listingId":"b4596e77-8657-4d35-b477-81f5c7e6af35","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/charges/353","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:15.116Z"}],"sources":[{"listingId":"b4596e77-8657-4d35-b477-81f5c7e6af35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/353","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:15.116Z","lastSeenAt":"2026-04-22T09:01:02.309Z"}],"details":{"listingId":"b4596e77-8657-4d35-b477-81f5c7e6af35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/353 \\\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 402 x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/353"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/353"}],"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 payment protocol integration with a low-cost test endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request billing without subscriptions or commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where $0.02/request adds up and bulk pricing is preferred","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.144Z"},"updatedAt":"2026-04-22T09:01:02.309Z"}}