{"id":"c48f63f7-75aa-4463-9400-c0e1b51150d9","shortId":"zkeYCd","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/202` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind the `/api/v1/charges/202` endpoint is unclear beyond its \"Premium API Access\" label. The x402 challenge confirms the endpoint is live and accepting payment negotiations.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/charges/202 ('Premium API Access') is not documented — unclear what data or service it returns","No usage examples or error handling documentation found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/202","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/202","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 pricing is clear ($0.02 USDC on Base), but there is zero documentation for request/response schemas, no OpenAPI spec, and the actual functionality behind /api/v1/charges/202 is undefined. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt.","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":"2026-04-19T03:36:50.483Z","embedding":[-0.02279663,-0.04434204,0.03866577,0.015823364,0.018447876,-0.030822754,-0.033813477,0.029815674,0.06768799,-0.07385254,0.029388428,-0.043670654,-0.0236969,-0.024871826,-0.035247803,0.00091838837,-0.0063209534,0.00655365,-0.04269409,0.024993896,0.021835327,-0.017105103,-0.014785767,0.028793335,0.0021648407,-0.025558472,-0.0061836243,-0.0053100586,-0.020080566,-0.029953003,0.036193848,-0.026016235,-0.0048942566,0.015914917,-0.015808105,-0.022842407,-0.012557983,0.029693604,0.033569336,-0.00818634,-0.0158844,-0.04800415,-0.00031137466,-0.006664276,-0.066223145,-0.0035934448,0.01108551,-0.017303467,0.0004348755,0.008323669,-0.033691406,-0.006916046,-0.0026741028,0.0035495758,0.0076904297,0.0070152283,-0.0109939575,-0.00075769424,0.00592041,0.010665894,-0.0012292862,-0.06738281,-0.008132935,-0.0031604767,-0.0007100105,0.05493164,-0.014305115,0.04748535,0.014694214,0.05154419,0.050231934,0.05532837,0.03277588,0.0073394775,0.006465912,-0.00019919872,0.008407593,0.062927246,-0.008857727,-0.0077400208,-0.022659302,-0.0025787354,-0.04724121,0.00198555,-0.01966858,-0.039154053,-0.016189575,0.017074585,-0.017822266,0.023452759,-0.07220459,0.004459381,-0.01399231,-0.002128601,0.01876831,0.004096985,-0.0073127747,0.021697998,-0.010978699,0.018875122,0.009750366,-0.042816162,0.015098572,0.014533997,0.046691895,0.050964355,0.026809692,0.029174805,0.006755829,-0.012817383,-0.020736694,0.023071289,-0.020904541,-0.018127441,0.010818481,0.005706787,-0.020645142,0.013870239,-0.028121948,0.008491516,-0.04876709,0.049072266,0.032318115,-0.011878967,0.023620605,-0.042236328,-0.020141602,0.009346008,-0.023757935,-0.012107849,0.015083313,0.016494751,0.042907715,-0.026153564,-0.028045654,0.0057373047,-0.0035324097,-0.030838013,-0.058441162,-0.040802002,0.049865723,-0.0289917,0.022628784,0.03100586,-0.09790039,-0.0028858185,-0.043670654,-0.00037670135,-0.029693604,-0.006713867,-0.015083313,0.026275635,-0.021469116,-0.0036640167,-0.021408081,-0.020004272,0.0034332275,0.03552246,-0.018737793,0.048187256,-0.015434265,0.030166626,0.018585205,0.0061950684,0.030578613,0.024017334,-0.0032138824,-0.06781006,-0.085998535,-0.028335571,-0.013015747,-0.014099121,-0.04034424,0.004058838,-0.0023822784,-0.07507324,-0.025497437,-0.0067253113,-0.0032672882,-0.03390503,-0.0057868958,-0.02772522,0.020065308,-0.01234436,-0.074279785,-0.023666382,-0.022872925,0.077941895,0.020507812,0.024520874,0.032836914,-0.0072517395,0.062286377,0.02545166,-0.02470398,-0.026290894,0.027664185,-0.015686035,0.014953613,-0.0049209595,0.008399963,-0.031921387,0.040161133,0.06561279,0.02432251,-0.021575928,-0.0064353943,-0.056396484,-0.036895752,-0.041015625,0.012229919,0.009506226,0.0051574707,0.04397583,-0.03125,-0.03591919,-0.009162903,0.005455017,0.015975952,0.060760498,0.0155181885,-0.01826477,0.021514893,0.01586914,-0.043792725,0.037902832,0.033294678,0.012832642,-0.021469116,-0.027664185,0.029342651,0.029800415,-0.031585693,0.010116577,-0.016845703,0.016067505,0.00049591064,0.00957489,0.038238525,-0.019699097,-0.023498535,-0.02267456,-0.018753052,0.02558899,0.0074424744,-0.031173706,-0.04168701,-0.08129883,0.04949951,0.025527954,0.045959473,-0.0079956055,0.01638794,-0.025146484,-0.004714966,-0.07330322,0.056396484,0.07366943,-0.016174316,-0.01802063,0.009750366,-0.012374878,-0.031982422,-0.0019893646,-0.0038833618,-0.02809143,-0.036499023,0.012229919,-0.047210693,0.006668091,0.021362305,0.017532349,0.067993164,-0.00982666,-0.05770874,-0.023483276,-0.007320404,0.00022387505,-0.015464783,0.0021877289,-0.01965332,0.012886047,0.030715942,-0.0074882507,0.025527954,-0.0067253113,-0.0019493103,-0.0004608631,0.00028538704,-0.017166138,-0.024887085,0.014099121,-0.018966675,-0.06970215,0.010292053,-0.0057678223,0.06201172,-0.05618286,0.041778564,-0.01197052,0.010276794,0.06298828,-0.011207581,-0.043792725,0.008148193,0.025802612,0.01902771,0.039611816,0.0128479,-0.035614014,-0.012748718,0.06982422,-0.014343262,-0.0178833,-0.00083589554,0.01423645,0.026794434,-0.0015592575,-0.07458496,-0.034606934,-0.0109939575,-0.03164673,0.023544312,-0.02760315,0.027908325,-0.018432617,0.008026123,-0.023117065,-0.0007481575,-0.029693604,0.020065308,-0.015167236,0.014343262,-0.01687622,-0.01234436,0.015434265,0.020629883,-0.0209198,0.00920105,0.04248047,0.035339355,-0.014129639,-0.033111572,-0.018600464,-0.013450623,0.0047683716,0.022567749,0.024017334,0.025619507,0.05618286,-0.03781128,0.017074585,0.032806396,0.024734497,0.032958984,-0.013008118,0.008369446,-0.06903076,-0.05343628,-0.027938843,-0.036224365,0.03491211,0.017822266,0.0015602112,0.050323486,0.00466156,-0.023361206,-0.03338623,0.021820068,-0.04611206,0.0006456375,0.046875,-0.011146545,-0.026397705,-0.008331299,-0.0027370453,0.0040245056,0.036376953,0.016281128,0.005809784,0.06768799,0.035247803,0.005531311,0.02748108,0.010620117,0.03100586,0.0004930496,-0.02784729,-0.027359009,-0.0024337769,0.017654419,-0.022033691,-0.025344849,-0.064331055,0.050933838,0.046295166,0.0791626,0.02078247,0.003435135,0.03353882,-0.015357971,0.014480591,-0.022964478,-0.020385742,-0.02935791,-0.04940796,0.035003662,-0.009811401,-0.002670288,-0.021514893,0.039031982,0.0069007874,0.016143799,-0.02696228,0.0463562,0.0018854141,-0.015396118,0.025268555,0.0064964294,0.046020508,0.07147217,-0.046020508,0.03616333,0.021514893,-0.0413208,0.00022375584,0.044799805,-0.022460938,-0.006504059,-0.06222534,-0.028182983,0.008453369,-0.0048713684,-0.05657959,-0.0005311966,0.0060272217,0.019729614,0.0262146,-0.014923096,-0.024505615,-0.0051574707,-0.012779236,-0.042755127,-0.0045661926,-0.034301758,-0.0028381348,0.039978027,-0.030838013,0.0017576218,0.011741638,-0.0099105835,-0.0054512024,0.017242432,0.022872925,-0.004337311,-0.04925537,0.02633667,0.015945435,0.00881958,0.00919342,0.032836914,0.02772522,0.028366089,0.05050659,0.0131073,-0.015182495,-0.0592041,0.02027893,-0.049072266,0.0030441284,0.020904541,-0.020233154,-0.0023231506,-0.020446777,-0.028335571,-0.028396606,-0.0052223206,-0.03164673,0.0036373138,0.013977051,-0.031036377,-0.032287598,-0.058929443,-0.009552002,-0.0042686462,0.06689453,0.029663086,0.005191803,-0.06384277,-0.0107040405,0.016693115,0.011367798,0.016937256,-0.015792847,-0.01373291,-0.013404846,-0.042297363,0.00056648254,-0.013069153,0.0149383545,-0.0051078796,-0.017974854,0.03253174,-0.0010232925,0.022079468,0.00005543232,0.016143799,0.034698486,-0.030685425,-0.0052375793,-0.019546509,0.03289795,0.0038414001,-0.005420685,-0.052978516,0.042236328,0.023086548,0.03387451,-0.03982544,-0.0002579689,-0.009063721,0.008453369,0.01701355,-0.011062622,-0.00573349,-0.006462097,-0.05819702,-0.054840088,0.028198242,-0.027130127,0.024993896,0.005870819,-0.00009936094,0.018463135,-0.009017944,0.015014648,0.021362305,-0.024978638,-0.0073280334,-0.023620605,-0.038208008,-0.014503479,-0.0050468445,-0.014328003,0.023361206,-0.027801514,0.017684937,0.003364563,-0.021820068,0.025360107,0.0030822754,0.0035495758,0.019744873,-0.004211426,0.018447876,0.05038452,0.008811951,-0.03665161,0.028045654,0.0033855438,0.011650085,-0.011383057,0.04147339,0.02708435,-0.008148193,-0.004863739,-0.009651184,-0.0090408325,-0.020645142,0.0015106201,0.0132369995,0.018112183,-0.0051078796,-0.0501709,0.027023315,0.018615723,-0.02960205,-0.018447876,0.019592285,0.015029907,-0.033233643,0.027252197,0.03111267,0.06011963,-0.01713562,0.004348755,0.005760193,0.030166626,0.029708862,0.019042969,-0.013290405,0.018417358,-0.009757996,0.014923096,-0.0071868896,-0.0062408447,0.013870239,0.0015420914,0.020202637,0.018218994,0.009017944,-0.020385742,-0.030517578,0.011138916,-0.014694214,-0.023849487,0.024749756,0.019302368,0.013572693,-0.021133423,0.026229858,0.013046265,-0.020233154,-0.020050049,0.0036811829,0.03274536,-0.018234253,-0.023727417,0.014976501,0.009216309,0.041870117,-0.05960083,-0.009277344,0.007843018,0.01260376,-0.025512695,-0.033172607,-0.03945923,0.01374054,0.03579712,0.014129639,0.021224976,0.035308838,0.008575439,0.0009059906,0.020248413,0.0020561218,-0.01637268,-0.010047913,-0.047698975,-0.0061912537,-0.010322571,-0.0062065125,-0.03729248,0.009506226,-0.013771057,-0.040863037,0.0104522705,-0.009857178,-0.00283432,-0.006439209,0.018615723,0.039916992,-0.00374794,0.008544922,-0.022506714,-0.03060913,0.007045746,-0.0013799667,0.022201538,-0.057647705,0.0052871704,-0.014854431,-0.0023040771,0.0011167526,0.0045776367,0.030715942,0.03253174,-0.0031967163,0.033721924,-0.048217773,0.048309326,-0.03503418,0.012107849,0.015136719,-0.04837036,-0.0046539307,-0.021896362,-0.0040779114,0.036743164,-0.021881104,-0.0034065247,-0.03552246,-0.029571533,-0.010559082,-0.05618286,0.013763428,0.03753662,0.03878784,-0.024658203,-0.0031852722,-0.010787964,0.0007472038,-0.023971558,0.008026123,-0.019424438,0.015914917,0.012634277,0.014656067,-0.016967773,-0.024414062,-0.024353027,-0.002576828,-0.048980713,-0.05267334,-0.019134521,0.01222229,-0.009475708,-0.01449585,-0.02041626,-0.023666382,0.002620697,-0.039855957,0.016220093,0.006290436,0.033935547,0.00957489,-0.013031006,-0.0009880066,0.013870239,-0.011772156,0.042510986,0.015594482,-0.0035991669,-0.033081055,0.004070282,0.038513184,0.02204895,-0.01108551,-0.0055885315,-0.011100769,-0.020584106,-0.049713135,-0.0044403076,-0.004421234,-0.0075569153,-0.010261536,0.003118515,-0.049743652,-0.0024280548,-0.018157959,0.0007915497,0.033966064,0.015838623,0.022644043,0.0009646416,0.007881165,-0.0075149536,-0.011833191,-0.032287598,0.028396606,0.011474609,0.00072956085,0.011444092,0.039733887,0.0039024353,-0.016235352,0.002576828,0.0008559227,0.014518738,-0.024963379,0.009506226,-0.017303467,0.010948181,-0.015899658,-0.011314392,-0.041107178,-0.0065956116,0.092285156,-0.00030303,-0.022735596,-0.009384155,-0.013572693,0.018554688,0.017791748,-0.039154053,-0.010574341,-0.034362793,0.019012451,-0.029556274,0.021820068,-0.0019607544,0.020324707,-0.02204895,-0.068237305,-0.016784668,0.002286911,-0.01751709,-0.06011963,-0.017532349,-0.068115234,-0.001619339,-0.0006403923,-0.027770996,0.003768921,0.014762878,-0.011756897,-0.07598877,0.014732361,0.052215576,0.00680542,0.024047852,-0.014022827,0.018234253,0.023132324,-0.03036499,-0.0116119385,0.033233643,-0.02017212,-0.008102417,-0.019973755,0.013671875,-0.018798828,-0.015419006,0.021362305,0.008377075,0.014373779,-0.001124382,0.0052719116,-0.010185242,0.013160706,-0.008201599,0.014976501,-0.008224487,-0.011253357,0.032592773,-0.043395996,0.028121948,0.020217896,-0.003124237,0.0060806274,0.025009155,0.04550171,-0.03567505,-0.0066833496,0.032440186,0.006843567,0.04638672,-0.030548096,0.040496826,0.023269653,-0.014152527,0.026855469,-0.010772705,-0.02267456,-0.03878784,-0.025177002,0.024993896,-0.00023043156,0.016601562,-0.01096344,0.002986908,0.012817383,-0.015777588,0.012008667,-0.013900757,-0.020614624,-0.015380859,0.004600525,-0.004058838,0.0007414818,-0.010574341,0.028396606,0.017578125,0.034606934,0.0035858154,-0.0058403015,0.0046424866,0.02935791,-0.011054993,0.012329102,0.022415161,0.0031738281,0.02406311,0.017822266,0.0023231506,-0.040771484,-0.012771606,-0.030059814,-0.0056877136,-0.0037136078,-0.0069847107,-0.020111084,-0.0011367798,-0.00333786,-0.004432678,-0.032409668,0.0104522705,-0.023483276,-0.018234253,-0.0029468536,-0.0064811707,0.016815186,0.011199951,0.0014238358,0.011756897,0.0013637543,0.0491333,-0.00023150444,-0.0040512085,0.024887085,0.03286743,0.018554688,-0.024261475,-0.0099105835,-0.017318726,0.001750946,-0.0009646416,-0.028900146,0.014343262,0.044830322,-0.014427185,0.0062179565,-0.0028057098,0.018875122,-0.00039839745,0.012054443,-0.01626587,0.019577026,-0.01033783,0.027282715,-0.037994385,0.016403198,0.013687134,0.009468079,-0.007583618,-0.015823364,-0.033691406,0.009468079,0.008560181,0.0014629364,0.056243896,0.00223732,0.019729614,-0.02557373,-0.015594482,0.017211914,-0.03466797,-0.018478394,0.036346436,0.0009765625,0.00059747696,0.013221741,-0.028762817,0.033966064,-0.03366089,0.028503418,-0.011650085,0.002773285,-0.012123108,-0.017456055,-0.025863647,-0.014221191,-0.010215759,0.009338379,-0.000541687,0.042053223,0.01550293,0.039276123,0.053771973,0.021835327,0.0009083748,-0.040618896,-0.033477783,-0.0023708344,-0.02079773,0.01828003,-0.009262085,0.041229248,0.038146973,0.0007224083,0.03366089,0.039611816,0.033599854,0.009262085,0.010032654,-0.019470215,0.009056091,-0.0023822784,0.028121948,-0.00009995699,0.03845215,-0.022949219,0.023849487,0.013244629,0.033111572,-0.032928467,0.033447266,0.07373047,0.015914917,-0.011398315,0.03945923,0.00027370453,-0.017852783,-0.013031006,-0.015289307,0.05822754,0.020996094,0.055145264,0.0602417,0.017166138,-0.009460449,0.015853882,-0.033447266,-0.034423828,0.0836792,0.027404785,-0.021347046,-0.020187378,-0.011116028,0.0071640015,-0.04928589,-0.03237915,0.02116394,-0.011184692,0.018737793,-0.009513855,-0.009468079,-0.012908936,0.012283325,0.02192688,0.016662598,-0.019088745,0.022399902,0.029220581,0.004699707,0.022079468,-0.0045700073,0.025726318,-0.029876709,-0.015945435,0.011962891,0.018753052,-0.012763977,-0.01335144,0.01940918,0.010284424,0.044433594,0.046051025,-0.009590149,0.012535095,0.03387451,0.018722534,-0.009025574,0.04989624,0.03933716,0.01940918,0.04071045,0.03552246,0.028579712,-0.03277588,0.022399902,-0.00083494186,0.0023326874,0.0068206787,-0.0061187744,0.0033779144,-0.015304565,0.024475098,-0.0007419586,-0.013328552,0.019546509,0.031921387,-0.003545761,-0.0027828217,-0.008392334,0.000808239,-0.020492554,-0.0014257431,0.0112838745,-0.011528015,0.026062012,0.0023059845,0.032348633,-0.022354126,0.019042969,-0.0121154785,-0.024673462,-0.0073623657,0.016723633,-0.033691406,-0.00062036514,-0.0028362274,0.0013484955,-0.04168701,0.012229919,0.027740479,-0.010559082,0.032043457,0.009155273,0.0021476746,0.0023708344,0.022537231,0.004924774,-0.0028190613,-0.014320374,-0.014381409,0.0440979,0.039916992,-0.00061273575,0.02053833,-0.025283813,-0.0035591125,-0.0009460449,0.0037879944,-0.0014238358,-0.014060974,-0.022567749,-0.021820068,0.010131836,0.03378296,0.01991272,0.037384033,-0.004032135,-0.026443481,0.015342712,0.029663086,0.0009031296,0.0021686554,-0.0052223206,0.02619934,-0.008644104,0.04550171,0.028366089,0.0060310364,0.031707764,-0.012634277,-0.016952515,0.01449585,-0.0084991455,0.030258179,-0.011604309,0.015312195,-0.008964539,0.028015137,-0.023788452,-0.03805542,0.006626129,-0.004676819,-0.016906738,-0.026657104,0.006713867,0.006465912,0.02293396,0.03994751,0.009788513,-0.031341553,0.06695557,-0.0072135925,0.046905518,-0.006385803,-0.002380371,0.0496521,0.0284729,0.0357666,0.01902771,0.010513306,-0.039916992,0.01713562,0.040618896,0.02645874,0.006072998,0.0023784637,-0.017868042,0.033203125,-0.0045394897,0.02204895,-0.018112183,-0.00020694733,0.01474762,-0.0022888184,-0.005584717,0.0075683594,-0.008865356,0.0051651,0.04574585,-0.0289917,-0.010818481,-0.023788452,-0.013900757,0.031677246,-0.0013055801,0.0038661957,0.0008664131,-0.015586853,0.0098724365,-0.02432251,-0.028335571,0.01386261,0.029922485,-0.0435791,-0.019195557,0.002922058,0.013175964,-0.018203735,0.026473999,0.026657104,-0.0023002625,0.009773254,0.04675293,-0.010307312,0.028305054,-0.0037403107,0.016113281,0.025238037,0.0041236877,-0.023086548,-0.0029296875,0.0041236877,-0.010093689,0.011749268,0.03793335,-0.016616821,0.0077590942,-0.0013618469,-0.02078247,0.0010757446,0.002155304,-0.008361816,0.008781433,-0.008743286,-0.018356323,-0.0033836365,-0.0023269653,0.0021476746,0.005104065,-0.01121521,-0.004814148,0.0066566467,0.029556274,0.024032593,-0.044067383,-0.0041275024,0.0070381165,0.008407593,-0.025665283,-0.019866943,-0.005882263,-0.026611328,0.019851685,0.0099105835,0.007671356,0.01374054,-0.01626587,0.0057754517,0.024337769,0.0059165955,0.019699097,0.0011367798,-0.008361816,0.012710571,-0.014732361,-0.0016822815,-0.004142761,-0.010520935,0.008346558,0.007785797,-0.0036811829,-0.03353882,0.031463623,-0.00037503242,0.022644043,0.0040359497,-0.021697998,0.011001587,-0.010269165,-0.010559082,0.00548172,0.019622803,-0.005935669,-0.010475159,-0.017120361,0.026229858,0.058288574,-0.011947632,-0.0034046173,0.024139404,0.010520935,0.020721436,0.03741455,0.018936157,0.03656006,0.025177002,-0.019348145,-0.01486969,0.027664185,-0.0034446716,-0.03363037,0.021133423,-0.005168915,-0.016540527,0.012145996,0.009674072,-0.0063972473,-0.025115967,-0.017349243,-0.009140015,-0.015655518,0.016433716,-0.011604309,0.01386261,-0.024475098,-0.0061073303,0.004009247,-0.020690918,-0.049865723,-0.029251099,-0.0017557144,-0.0087509155,-0.051605225,0.013725281,-0.035308838,0.010650635,-0.022476196,-0.0025424957,-0.012710571,0.02772522,-0.016723633,-0.0066490173,-0.0031929016,0.023513794,0.020706177,0.015075684,0.021011353,-0.029312134,-0.035980225,-0.02798462,-0.0007920265,-0.008010864,0.022567749,0.010726929,0.032470703,0.020980835,-0.012893677,0.0016784668,-0.01235199,0.0013971329,-0.0058898926,-0.019226074,-0.016616821,0.021133423,0.014465332,-0.020050049,-0.014640808,0.036621094,-0.024597168,-0.014503479,0.022323608,0.046783447,0.0014572144,0.022506714,-0.014831543,-0.002784729,-0.0033359528,-0.00021779537,-0.015205383,0.0071372986,0.010910034,-0.0053977966,-0.004688263,0.0035762787,0.022140503,-0.010955811,-0.013046265,0.023712158,0.0044937134,-0.024246216,0.03100586,0.009895325,0.012886047,-0.0009636879,-0.014678955,0.0231781,0.042144775,0.015640259,0.0033226013,-0.0016107559,0.0118637085,-0.015731812,0.014480591,0.017333984,-0.0184021,-0.038360596,-0.025894165,-0.02734375,0.01260376,0.0043182373,0.021972656,-0.006084442,0.016479492,-0.0206604,-0.03137207,-0.0231781,0.026260376,0.0099487305,-0.010536194,-0.021362305,0.011917114,0.020126343,-0.034179688,-0.0025634766,-0.03201294,-0.028900146,-0.0010728836,-0.020004272,0.01637268,0.014266968,-0.003484726,0.0020332336,-0.0074005127,-0.0044822693,0.004962921,0.030838013,-0.017852783,0.0041923523,0.023757935,0.008300781,-0.02809143,0.019241333,-0.0063209534,-0.0045318604,0.011604309,-0.011459351,0.011695862,-0.015701294,0.038208008,-0.0009236336,0.0052223206,0.027770996,-0.0050086975,0.0134887695,-0.028411865,0.01020813,0.0017032623,-0.00058078766,0.045013428,-0.022537231,-0.017532349,0.010322571,-0.020126343,-0.030273438,-0.0003373623,0.027374268,0.04647827,-0.015098572,0.03970337,-0.018814087,-0.010421753,0.009788513,0.014732361,-0.016220093,-0.0006699562,0.0335083,0.008476257,-0.0056419373,0.0041236877,-0.017303467,-0.035827637,-0.010269165,0.024673462,0.000113248825,-0.011161804,0.021499634,0.008926392,0.050231934,0.0042877197,0.021057129,0.015838623,0.0070228577,0.019073486,-0.004699707,0.04647827,-0.0017614365,-0.030761719,0.013160706,-0.0016698837,-0.021972656,-0.0143585205,-0.0063323975,-0.0007624626,-0.035217285,0.012084961,-0.00920105,0.031463623,-0.024459839,0.009529114,-0.026184082,-0.003145218,-0.03414917,-0.005859375,-0.02470398,0.013870239,0.03692627,-0.00051164627,0.023376465,0.011833191,-0.018310547,0.016616821,0.042633057,-0.006893158,-0.01914978,-0.01360321,0.018569946,0.0032634735,0.009895325,0.01399231,-0.013374329,-0.008880615,0.00894165,-0.019515991,0.019363403,-0.0063323975,0.010910034,-0.0012769699,-0.0043258667,-0.0027618408,0.028549194,-0.0019893646,-0.004814148,0.010696411,0.013671875,0.03515625,0.03189087,-0.00957489,0.02166748,0.018188477,-0.034301758,0.055267334,-0.0064926147,0.02633667,-0.02432251,0.0058555603,-0.03414917,-0.02331543,-0.0076828003,0.0005478859],"createdAt":"2026-04-18T18:44:33.304Z","updatedAt":"2026-04-24T04:03:33.401Z","lastSeenAt":"2026-04-24T04:03:33.401Z","tsv":"'/api':176 '/api/v1/charges/202':56,215 '/docs':174 '/pricing':175 '/readme':178 '/request':13,28 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '6':92 'Base network API' 'USDC micropayment API' 'accept':63,234 'access':7,22,42,61,223 'across':124 'advertis':122 'ai':134 'amount':79 'analysi':138 'analyt':128 'api':6,21,40,60,95,222 'attach':106 'avail':205 'base':9,24,50,75,83 'base-network' 'behind':213 'beyond':219 'broader':119 'call':4,19,89 'caller':104 'categori':126 'challeng':227 'classif':141 'collect':34 'commit':101 'confirm':228 'connect':184 'contract':71 'convers':158 'crawl':208 'crypto-paid API' 'data':127,131 'decim':93 'detail':191 'document':169,200 'embed':142 'endpoint':41,54,123,162,216,230 'equal':86 'estim':152 'exampl':204 'exchang':147 'export':132 'extrem':171 'feed':146 'financ':143 'four':125 'function':212 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'infrastructur':154 'insight':133 'key':96 'label':58,224 'learn':136 'limit':98 'list':161 'live':232 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'materi':209 'maximum':78 'metric':129 'negoti':236 'network':51 'no-api-key' 'openapi':195 'page':179 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116,235 'per':3,18,38,88,167 'platform':121 'post':64 'post-endpoint' 'premium':5,20,59,221 'premium API access' 'price':145,164 'prompt':186 'proof':117 'protocol':47 'quot':150 'rate':97,148 'render':181 'report':130 'request':39,65,168 'request/response':198 'requir':103 'schema':199 'sentiment':137 'settl':68 'simpli':105 'spars':172 'spec':196 'specif':53,211 'summar':140 'technic':190 'text':139 'token':149 'unclear':218 'unit':84 'upfront':100 'usag':203 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':185 'web3':144 'x':109 'x-payment':108 'x402':11,26,45,115,226 'x402 API' 'x402-payment'","prices":[{"id":"4a0ae806-d5c5-4e62-9f80-d5590a953aac","listingId":"c48f63f7-75aa-4463-9400-c0e1b51150d9","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/202","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:33.304Z"}],"sources":[{"listingId":"c48f63f7-75aa-4463-9400-c0e1b51150d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/202","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:33.304Z","lastSeenAt":"2026-04-24T04:03:33.401Z"}],"details":{"listingId":"c48f63f7-75aa-4463-9400-c0e1b51150d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/202 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/202"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/202"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic pay-per-call access to data, AI, finance, or utility endpoints","Crypto-native applications that settle micro-transactions in USDC on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Low-cost micro-transaction API consumption at $0.02/call"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.104Z"},"updatedAt":"2026-04-24T04:03:33.401Z"}}