{"id":"1556b6a9-572e-43aa-87cc-32c78269a0a7","shortId":"Pzhqj9","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/234` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers 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 endpoints are uniformly priced at $0.02 per request.\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 documentation, and no example payloads available. The specific functionality behind the `/api/v1/transactions/234` endpoint is unclear beyond its \"Premium API Access\" label. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to know what data or service is actually returned upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /api, /pricing, /README pages show only 'Connect wallet'","The specific purpose of /api/v1/transactions/234 ('Premium API Access') is not explained anywhere","No request body schema or response format is documented","Cannot verify what data or service is returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/234","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/transactions/234","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no examples, and documentation pages are empty stubs. The actual functionality behind this specific endpoint is undocumented.","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":"2026-04-19T12:37:44.863Z","embedding":[-0.031921387,-0.03842163,0.03137207,0.014801025,0.015281677,-0.024627686,-0.022399902,0.01638794,0.074645996,-0.054473877,0.025268555,-0.04260254,-0.04058838,-0.025634766,-0.022323608,0.011489868,0.002811432,0.004737854,-0.03338623,0.025756836,0.03439331,-0.019165039,-0.03466797,0.02168274,-0.001086235,-0.011054993,-0.010940552,-0.0070266724,-0.021118164,-0.04437256,0.04660034,-0.02758789,-0.007583618,0.0030708313,-0.010917664,-0.015670776,0.00032520294,0.033569336,0.027114868,-0.0023174286,0.005256653,-0.059570312,0.0030345917,-0.02708435,-0.06222534,0.005256653,0.0070152283,-0.02482605,0.01184845,0.0013952255,-0.036102295,-0.0048828125,-0.011764526,0.01600647,0.008880615,0.005027771,-0.0066719055,-0.011421204,0.0053138733,0.011291504,-0.015701294,-0.054748535,-0.017440796,-0.004085541,0.0062332153,0.049835205,-0.010505676,0.03982544,0.0087509155,0.070373535,0.03152466,0.050048828,0.032165527,0.012367249,0.0026512146,-0.009353638,-0.0038433075,0.054626465,-0.0063171387,-0.030914307,-0.010665894,-0.012458801,-0.060516357,-0.0022010803,-0.024917603,-0.044647217,-0.018539429,0.024719238,-0.018508911,0.024032593,-0.07458496,0.0047950745,-0.0014152527,-0.0030231476,-0.00079393387,-0.012619019,-0.012565613,0.023529053,-0.0059509277,0.009506226,-0.015037537,-0.04574585,0.025817871,0.010009766,0.03930664,0.047912598,0.022476196,0.021026611,0.0078125,-0.0050201416,-0.025848389,0.0178833,-0.005874634,-0.011604309,0.01737976,0.0018453598,-0.0076942444,0.0076560974,-0.024902344,0.027740479,-0.05532837,0.053649902,0.003288269,0.0015106201,-0.001789093,-0.04852295,-0.011871338,0.017410278,-0.027511597,-0.0021953583,0.018432617,0.02217102,0.02722168,-0.018829346,-0.032287598,0.02558899,-0.022705078,-0.008285522,-0.049194336,-0.032684326,0.03878784,-0.030014038,0.013397217,0.044433594,-0.09674072,-0.00932312,-0.040039062,0.0042877197,-0.024932861,-0.014472961,0.00071525574,0.023590088,-0.0138549805,-0.013008118,-0.026443481,-0.033813477,0.002500534,0.04272461,-0.010437012,0.042816162,-0.02609253,0.020339966,0.01727295,0.013038635,0.016967773,0.017166138,-0.0005698204,-0.07312012,-0.07678223,-0.015701294,0.0050582886,-0.023620605,-0.030731201,0.014213562,-0.010002136,-0.071899414,-0.016159058,-0.017089844,-0.0049476624,-0.052368164,-0.001953125,-0.033935547,0.026062012,-0.0045928955,-0.058898926,-0.034362793,-0.030151367,0.058258057,0.028884888,0.023986816,0.026062012,-0.00806427,0.058166504,0.022277832,-0.015975952,-0.013046265,0.017913818,-0.026123047,0.020233154,-0.009918213,0.016677856,-0.03189087,0.031097412,0.08258057,0.0014457703,-0.030563354,-0.007080078,-0.06323242,-0.04888916,-0.030456543,0.020965576,0.011512756,0.001124382,0.036254883,-0.033447266,-0.03326416,0.010513306,0.015556335,0.01802063,0.062042236,0.0107040405,-0.016235352,0.033050537,0.013755798,-0.05050659,0.046844482,0.041381836,0.011314392,-0.025741577,-0.042053223,0.029647827,0.042633057,-0.0259552,0.0128479,-0.010246277,0.022994995,-0.010299683,-0.0021896362,0.020385742,-0.016052246,-0.023040771,-0.0211792,-0.020080566,0.024276733,0.010131836,-0.0317688,-0.040405273,-0.079711914,0.05001831,0.03491211,0.04360962,-0.0011644363,0.0047416687,-0.021896362,-0.009643555,-0.0725708,0.06185913,0.06677246,-0.0067825317,-0.005420685,0.029281616,-0.008346558,-0.0440979,0.014984131,-0.026000977,-0.0262146,-0.022232056,0.015060425,-0.040222168,-0.0033626556,0.029083252,0.024215698,0.05130005,-0.009063721,-0.04940796,-0.024139404,-0.0056762695,0.0018405914,-0.030807495,0.010139465,-0.000934124,0.016464233,0.014602661,0.0049743652,0.016082764,0.004360199,-0.0023708344,-0.005367279,0.009307861,-0.0049057007,-0.032348633,0.019973755,0.001868248,-0.054382324,0.00047683716,-0.0066184998,0.0715332,-0.052124023,0.043701172,-0.01576233,0.009086609,0.057037354,-0.008743286,-0.04953003,0.00042319298,0.026870728,0.0135269165,0.04333496,0.016921997,-0.029525757,-0.012794495,0.073791504,-0.010185242,-0.0009651184,0.00957489,0.018875122,0.040985107,-0.008712769,-0.06378174,-0.042266846,0.0009264946,-0.03817749,0.030075073,-0.022140503,0.034118652,-0.016601562,0.002691269,-0.026687622,0.0011110306,-0.034057617,0.00040960312,-0.010658264,0.0065307617,-0.026153564,-0.02432251,0.018569946,0.007183075,-0.009780884,0.011947632,0.042297363,0.014076233,-0.0034046173,-0.02645874,-0.030883789,-0.009757996,-0.010002136,0.015670776,0.01675415,0.02784729,0.055755615,-0.041503906,0.003458023,0.017120361,0.022064209,0.032043457,-0.003818512,-0.00007259846,-0.06604004,-0.052978516,-0.025802612,-0.04144287,0.031036377,0.011245728,-0.010147095,0.052337646,0.011512756,-0.015716553,-0.03717041,0.019165039,-0.048309326,-0.0059280396,0.044281006,-0.022598267,-0.022323608,0.01108551,-0.003376007,0.0037784576,0.032409668,0.022735596,0.041259766,0.0715332,0.047088623,0.0107040405,0.023117065,-0.003129959,0.031402588,0.010520935,-0.023483276,-0.03363037,-0.024887085,0.03439331,-0.027786255,-0.01638794,-0.06512451,0.053222656,0.037384033,0.08862305,0.022506714,0.0035820007,0.029571533,-0.013397217,0.01461792,-0.019439697,-0.025299072,-0.026397705,-0.040283203,0.030273438,-0.012489319,-0.0076675415,-0.010627747,0.032073975,-0.0007824898,0.01927185,-0.023788452,0.04650879,-0.019561768,-0.018234253,0.022613525,0.010406494,0.054534912,0.06585693,-0.045959473,0.028869629,0.024169922,-0.024963379,0.0052948,0.033081055,-0.014038086,-0.0025730133,-0.041137695,-0.02470398,-0.0121154785,-0.004611969,-0.044830322,0.011810303,0.011161804,0.021438599,0.021102905,-0.0053253174,-0.018463135,0.0007920265,-0.014640808,-0.04345703,0.002588272,-0.034851074,0.0002477169,0.039794922,-0.02545166,-0.0009627342,-0.0020656586,0.0002770424,0.002664566,0.016418457,0.020751953,0.004009247,-0.042633057,0.02734375,0.0041275024,0.015075684,0.013885498,0.029449463,0.019882202,0.035858154,0.04660034,0.018508911,-0.006374359,-0.06427002,0.013908386,-0.04699707,-0.00083971024,0.024154663,-0.027740479,0.0025596619,-0.02154541,-0.029785156,-0.021133423,0.0155181885,-0.025466919,0.0037498474,0.024612427,-0.019348145,-0.026794434,-0.05847168,-0.02330017,-0.011207581,0.054748535,0.023864746,0.023345947,-0.06512451,-0.000090539455,0.020751953,0.0082092285,0.03552246,-0.014656067,0.00055360794,-0.017364502,-0.03250122,-0.011177063,-0.023406982,0.0262146,-0.008239746,-0.0007443428,0.018371582,0.008918762,0.028030396,0.0056037903,0.009857178,0.021774292,-0.020751953,-0.012779236,-0.004798889,0.039093018,0.019378662,-0.014579773,-0.053863525,0.042755127,0.015129089,0.029571533,-0.04699707,-0.007221222,-0.014968872,0.0037612915,0.006980896,-0.010597229,-0.002910614,-0.012382507,-0.05126953,-0.07019043,0.04269409,-0.01739502,0.027008057,0.029891968,0.0057907104,0.029312134,-0.012458801,-0.003189087,0.009300232,-0.024734497,-0.004917145,-0.025177002,-0.03338623,-0.0236969,-0.016189575,-0.028518677,0.025970459,-0.022033691,0.014602661,0.009277344,-0.020339966,0.028396606,-0.009155273,-0.0007109642,0.011207581,0.0033664703,0.025390625,0.032318115,0.008087158,-0.046051025,0.0209198,0.0028953552,0.008354187,-0.004863739,0.04611206,0.025741577,-0.0060310364,-0.006122589,-0.014213562,-0.022964478,-0.02671814,0.000066280365,0.0049705505,0.00881958,0.0018024445,-0.04095459,0.0138168335,0.005607605,-0.038848877,-0.03314209,0.009780884,0.013763428,-0.03479004,0.018615723,0.032958984,0.048675537,-0.015945435,0.0010585785,-0.0017795563,0.026763916,0.04058838,0.018585205,-0.0060653687,0.021118164,-0.010406494,0.019500732,-0.002412796,-0.018234253,0.011688232,0.0027561188,0.021453857,0.019927979,0.0052871704,-0.021347046,-0.030776978,-0.0046539307,-0.012969971,-0.033233643,0.026397705,0.01902771,0.03491211,-0.022827148,0.01537323,0.018310547,-0.017654419,-0.010536194,-0.014732361,0.04058838,-0.012390137,-0.008964539,0.011672974,0.017349243,0.030670166,-0.05883789,-0.005355835,0.002855301,0.007637024,-0.018203735,-0.04928589,-0.03765869,0.0026283264,0.04562378,0.012512207,0.020126343,0.034301758,0.009727478,0.014564514,0.033294678,-0.0067596436,-0.015464783,-0.012016296,-0.047790527,-0.024246216,-0.013557434,0.0071754456,-0.030075073,0.014915466,-0.0053100586,-0.031097412,0.007045746,-0.014053345,0.0012702942,-0.01612854,0.014892578,0.04135132,0.0046958923,0.019577026,-0.014862061,-0.03994751,0.003282547,0.010795593,0.014213562,-0.0395813,0.021347046,-0.01335144,-0.011634827,-0.0022678375,0.012367249,0.023345947,0.020568848,0.008239746,0.039855957,-0.040649414,0.049621582,-0.034423828,0.006855011,-0.006465912,-0.042114258,-0.019424438,-0.020492554,-0.012840271,0.041534424,-0.03375244,-0.0053749084,-0.035705566,-0.029708862,-0.0137786865,-0.05709839,0.013710022,0.04248047,0.037872314,-0.023513794,0.0027942657,-0.009414673,0.008155823,-0.01612854,0.0069007874,-0.020141602,0.03253174,0.024276733,0.007156372,-0.03540039,-0.024749756,-0.022521973,-0.0043525696,-0.04598999,-0.05569458,-0.013763428,0.005569458,-0.011123657,-0.013015747,-0.019348145,-0.03152466,-0.0045280457,-0.036346436,0.008056641,0.002500534,0.022979736,0.006259918,-0.02760315,-0.0037841797,0.014656067,-0.012893677,0.03869629,0.009056091,-0.008514404,-0.047851562,0.013961792,0.022338867,0.020996094,-0.009254456,-0.018615723,-0.008346558,-0.021392822,-0.056121826,-0.008155823,-0.004119873,-0.01612854,-0.011009216,0.0040016174,-0.057037354,-0.0006766319,-0.021026611,-0.000018715858,0.023712158,0.005836487,0.015640259,-0.0016841888,0.014091492,-0.0041275024,0.00019454956,-0.030853271,0.014915466,0.010749817,0.0046577454,0.0289917,0.054626465,-0.002714157,-0.030273438,0.012397766,0.0019702911,0.0135650635,-0.01876831,0.00843811,-0.01864624,0.008888245,-0.005996704,-0.013298035,-0.040039062,-0.0034503937,0.089538574,-0.0015068054,-0.012710571,-0.013168335,-0.016326904,0.020111084,0.027999878,-0.03152466,-0.0051460266,-0.016448975,0.019836426,-0.028030396,0.0048599243,0.002790451,0.023635864,-0.0140686035,-0.057617188,-0.023895264,-0.015464783,-0.008758545,-0.06112671,-0.033050537,-0.06842041,0.00440979,-0.011924744,-0.022491455,0.0018405914,0.0073623657,-0.018325806,-0.0836792,-0.00089788437,0.05303955,0.0079956055,0.029174805,-0.009025574,0.02482605,0.02671814,-0.0395813,-0.0037784576,0.028518677,-0.027191162,-0.018173218,-0.023788452,0.021743774,-0.018417358,-0.010467529,0.0034389496,0.010360718,0.013885498,-0.010009766,0.0036144257,-0.010192871,0.020401001,-0.02180481,0.019683838,-0.01751709,-0.018585205,0.03427124,-0.048339844,0.022262573,0.0076675415,-0.012908936,0.0001912117,0.03704834,0.041748047,-0.033843994,-0.021743774,0.018188477,0.012641907,0.035003662,-0.021728516,0.04876709,0.008239746,-0.012313843,0.013473511,-0.00945282,-0.017486572,-0.019180298,-0.027236938,0.013267517,-0.0039138794,0.009460449,-0.019088745,-0.007549286,0.015075684,0.008468628,0.0115356445,-0.009811401,-0.02583313,-0.028625488,0.003484726,0.0063552856,0.004081726,-0.0010156631,0.025283813,0.029968262,0.037750244,0.014091492,-0.01826477,0.0044670105,0.03164673,-0.006313324,0.0031147003,0.02558899,0.0059280396,0.016601562,0.019744873,0.013763428,-0.05130005,-0.02067566,-0.023361206,-0.014709473,-0.005596161,-0.007610321,-0.017044067,-0.0070648193,0.0013427734,-0.00894165,-0.02960205,0.0019931793,-0.026031494,-0.031799316,-0.0035266876,-0.019012451,0.027633667,0.00982666,0.001452446,0.003774643,-0.010238647,0.033599854,-0.006427765,-0.021835327,0.02986145,0.027557373,0.017608643,-0.03149414,-0.002922058,-0.016189575,-0.007575989,0.0020446777,-0.03652954,0.012550354,0.04348755,-0.017669678,-0.0026760101,0.005821228,0.025054932,-0.0074272156,0.00642395,-0.010314941,0.01852417,-0.0074310303,0.035827637,-0.047668457,0.02708435,0.009132385,0.0059051514,-0.018814087,-0.007457733,-0.026062012,0.017181396,0.0060806274,-0.013793945,0.05154419,0.006778717,0.03302002,-0.024261475,-0.034118652,0.0048980713,-0.02986145,-0.021774292,0.0206604,-0.012268066,0.0038204193,0.018035889,-0.027420044,0.03439331,-0.033355713,0.01826477,0.00340271,0.007926941,-0.0062026978,-0.01889038,-0.0010070801,-0.016189575,-0.017227173,0.006298065,-0.004142761,0.05279541,0.01864624,0.024490356,0.05001831,0.018997192,0.00059890747,-0.04244995,-0.03074646,0.010192871,-0.008651733,0.01751709,-0.018295288,0.054534912,0.034484863,0.0026245117,0.045898438,0.026779175,0.039855957,0.008338928,0.0069007874,-0.018722534,0.016952515,-0.0018348694,0.029129028,-0.0037002563,0.032836914,-0.034851074,0.028945923,0.018234253,0.027420044,-0.027420044,0.037078857,0.0690918,0.018997192,-0.010879517,0.042633057,-0.006351471,-0.009780884,-0.010658264,-0.018051147,0.04638672,0.00548172,0.044128418,0.05480957,0.015640259,-0.001291275,0.020370483,-0.021362305,-0.020263672,0.06542969,0.02760315,-0.024429321,-0.0107421875,0.0022602081,0.013313293,-0.043395996,-0.021392822,0.02659607,-0.013946533,0.011276245,-0.000024139881,-0.0035648346,-0.009178162,0.006713867,0.017288208,0.010726929,-0.011779785,0.028579712,0.032836914,-0.0019273758,0.024490356,-0.0031986237,0.022338867,-0.028030396,-0.016464233,0.019927979,0.028213501,-0.0105896,-0.012176514,0.02268982,0.006122589,0.036376953,0.044525146,-0.020751953,0.007835388,0.033355713,0.010238647,-0.00440979,0.053466797,0.036346436,0.011413574,0.039093018,0.025894165,0.032989502,-0.044555664,0.026931763,0.0033073425,-0.0010938644,-0.013885498,-0.0063209534,0.00182724,-0.016723633,0.01676941,0.00233078,-0.010749817,0.020187378,0.021377563,-0.00919342,-0.009597778,-0.0040359497,0.0104599,-0.029525757,-0.008491516,0.009971619,-0.012550354,0.03894043,0.004180908,0.0289917,-0.023086548,0.018341064,-0.0023536682,-0.017288208,0.0013504028,0.024993896,-0.0335083,0.00029110909,-0.005306244,0.0047683716,-0.05831909,0.004131317,0.027954102,-0.014343262,0.022445679,0.011459351,-0.0015363693,-0.008018494,0.033233643,0.012481689,-0.00198555,-0.015602112,-0.023254395,0.025558472,0.043701172,-0.0060577393,-0.0050735474,-0.027664185,-0.0058898926,0.0044136047,-0.00806427,-0.003856659,-0.010757446,-0.021377563,-0.019134521,0.020309448,0.033691406,0.017501831,0.05630493,-0.022857666,-0.015167236,0.011550903,0.03781128,-0.0030517578,-0.0006322861,0.0014314651,0.019317627,-0.01864624,0.04901123,0.031341553,0.009750366,0.036468506,0.00062561035,-0.020828247,0.007255554,-0.0127334595,0.022201538,-0.013313293,-0.0008416176,-0.0006594658,0.032409668,-0.015037537,-0.039855957,0.004333496,-0.019012451,-0.025039673,-0.013290405,0.01612854,0.0037136078,0.028137207,0.035888672,0.023529053,-0.02243042,0.05899048,-0.011207581,0.04449463,0.003288269,-0.010917664,0.04537964,0.009590149,0.03604126,0.01499939,0.017410278,-0.037109375,0.025161743,0.025299072,0.025344849,0.014312744,0.008804321,-0.019073486,0.03756714,-0.0028018951,0.034606934,-0.008148193,0.00042533875,0.022994995,-0.0050468445,-0.012275696,-0.012878418,-0.008796692,0.008483887,0.051879883,-0.032592773,-0.016220093,-0.026473999,-0.012588501,0.02116394,-0.018798828,0.0013494492,0.0013780594,-0.01524353,0.011695862,-0.016983032,-0.028289795,0.01121521,0.02482605,-0.055633545,-0.013053894,0.004333496,0.020568848,-0.021697998,0.03286743,0.02027893,-0.001964569,0.008995056,0.049591064,-0.0072364807,0.031036377,-0.011077881,0.027511597,0.028579712,0.0024719238,-0.021347046,-0.0027217865,0.008102417,-0.012084961,0.018127441,0.03677368,-0.015167236,0.004585266,-0.00806427,-0.0048332214,-0.0026760101,0.008155823,-0.010749817,0.012756348,-0.014274597,-0.012458801,0.000702858,0.0038375854,-0.0015916824,0.0027980804,0.005630493,-0.017044067,0.011039734,0.04067993,0.013412476,-0.03366089,-0.005622864,0.005317688,0.0070648193,-0.021865845,-0.008384705,-0.0016021729,-0.036071777,0.016189575,0.009170532,0.013336182,0.008842468,-0.02407837,-0.00044703484,0.024658203,0.008796692,0.017791748,0.0010957718,0.00111866,0.021499634,-0.007801056,-0.0031166077,-0.003818512,-0.005783081,0.011878967,0.019470215,0.0006365776,-0.03503418,0.020706177,-0.0016269684,0.017349243,-0.0010070801,-0.015129089,0.014183044,-0.0059928894,0.0049972534,-0.0042648315,0.01108551,-0.009178162,-0.009178162,-0.013221741,0.040039062,0.058898926,-0.013153076,-0.0075912476,0.0206604,0.017044067,0.017791748,0.033599854,0.0062446594,0.04034424,0.028945923,-0.015609741,-0.024887085,0.027923584,-0.009750366,-0.02810669,0.012039185,-0.016220093,-0.016616821,0.016342163,0.009178162,0.0002810955,-0.035583496,-0.00843811,-0.010421753,-0.013206482,0.019012451,-0.011299133,0.007183075,-0.02722168,-0.014129639,0.019104004,-0.020019531,-0.042999268,-0.021972656,-0.00818634,-0.011558533,-0.055541992,0.011100769,-0.027526855,0.010192871,-0.030258179,-0.00051116943,-0.009086609,0.0087509155,-0.010292053,-0.015655518,0.005191803,0.024276733,0.027374268,0.0067329407,0.023010254,-0.031311035,-0.016586304,-0.03062439,0.007144928,-0.01222229,0.026000977,-0.0008625984,0.02923584,0.025161743,-0.013465881,-0.004032135,-0.010284424,-0.0009431839,-0.016036987,-0.018539429,-0.024871826,0.029647827,0.0107040405,-0.012168884,-0.013069153,0.041534424,-0.029891968,-0.021591187,0.032287598,0.037506104,0.007408142,0.028945923,-0.02180481,-0.00116539,-0.013832092,-0.0010967255,-0.011772156,0.0072288513,0.004173279,0.008628845,-0.009902954,0.009086609,0.0234375,-0.010238647,-0.00082206726,0.03616333,0.010032654,-0.0031929016,0.034362793,0.007987976,0.0068092346,-0.012771606,-0.0071372986,0.025161743,0.04852295,0.008895874,-0.00040888786,-0.011138916,0.0063095093,-0.0178833,0.013633728,0.011405945,-0.01965332,-0.045776367,-0.016921997,-0.03062439,0.025848389,-0.0030994415,0.0062026978,-0.013092041,0.019836426,-0.0093307495,-0.028320312,-0.024047852,0.032318115,0.0143966675,-0.015296936,-0.00894165,0.017852783,0.009086609,-0.041931152,-0.0015134811,-0.045562744,-0.037200928,-0.004207611,-0.023162842,0.028320312,0.011695862,-0.0084991455,-0.0056152344,-0.007484436,-0.0037384033,0.0051841736,0.023880005,-0.010597229,-0.0022945404,0.033355713,0.02116394,-0.0135269165,0.021881104,-0.0124053955,0.007080078,0.0066184998,-0.0134887695,0.01751709,-0.021499634,0.028060913,-0.016677856,-0.009666443,0.02279663,-0.0059432983,0.017028809,-0.03756714,0.0041122437,-0.0052108765,-0.008728027,0.039855957,-0.029632568,-0.015220642,0.007896423,-0.018966675,-0.026031494,0.0041122437,0.015136719,0.029449463,-0.00730896,0.046569824,-0.018341064,-0.010917664,0.018356323,0.0154800415,-0.012962341,0.005306244,0.028915405,-0.002817154,-0.0036697388,-0.0022716522,-0.01713562,-0.028259277,-0.006641388,0.018936157,-0.0069618225,-0.0075683594,0.034423828,0.019836426,0.04272461,-0.004589081,0.019882202,0.0069999695,0.008163452,0.027526855,-0.00036907196,0.056121826,-0.00041627884,-0.028244019,0.00687027,0.0065345764,-0.029525757,0.007785797,-0.003900528,0.0021438599,-0.041503906,0.015602112,0.0011672974,0.021316528,-0.021118164,0.013069153,-0.021865845,-0.011054993,-0.037017822,-0.00021159649,-0.031951904,0.006565094,0.028396606,0.0075302124,0.031585693,-0.001250267,-0.02571106,0.015403748,0.043182373,-0.0066871643,-0.023071289,-0.01687622,0.009963989,0.0016231537,0.015090942,0.0062026978,-0.026763916,-0.010192871,0.008163452,-0.015090942,0.009895325,-0.010101318,0.011474609,0.0043907166,-0.0037498474,-0.010772705,0.026489258,-0.0064430237,-0.0035953522,0.01461792,0.0027332306,0.030181885,0.029785156,-0.014183044,0.022583008,0.01890564,-0.043426514,0.057525635,0.0016946793,0.02508545,-0.0234375,0.001871109,-0.03579712,-0.026397705,-0.022079468,0.0033988953],"createdAt":"2026-04-18T18:59:27.647Z","updatedAt":"2026-04-24T16:03:18.221Z","lastSeenAt":"2026-04-24T16:03:18.221Z","tsv":"'/api':163 '/api/v1/transactions/234':56,199 '/docs':162 '/pricing':164 '/readme':166 '/request':13,28 '0.02':12,27,78,154 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,207 'across':112 'actual':238 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,206 'attach':95 'avail':193 'base':8,23,51,73 'behind':197 'beyond':203 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67,211 'classif':129 'confirm':218 'connect':172 'convers':146 'crypto-paid API' 'data':115,119,234 'detail':179 'difficult':230 'document':157,188,227 'embed':130 'endpoint':55,111,149,200,220 'estim':140 'exampl':191 'exchang':135 'export':120 'extrem':159 'feed':134 'financ':131 'form':217 'four':113 'function':196 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'know':232 'label':208 'lack':225 'learn':124 'limit':89 'list':58 'live':213 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'make':228 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'openapi':183 'oper':222 'page':167 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':192 'payment':48,99,105,242 'per':3,18,36,79,155 'platform':6,21,39,82,109 'premium':60,205 'price':133,152 'prompt':174 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':169 'report':118 'request':37,68,156 'request/response':186 'return':64,239 'schema':187 'sentiment':125 'servic':236 'simpli':94 'spars':160 'spec':184 'specif':54,195 'success':241 'summar':128 'technic':178 'text':127 'token':137 'unclear':202 'uniform':151 'unit':74 'upon':240 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':173 'web3':132 'well':216 'well-form':215 'x':98 'x-payment':97 'x402':11,26,43,104,210 'x402 API' 'x402-payment'","prices":[{"id":"01384480-9b67-4ab2-83c8-24f2b690300d","listingId":"1556b6a9-572e-43aa-87cc-32c78269a0a7","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/transactions/234","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:27.647Z"}],"sources":[{"listingId":"1556b6a9-572e-43aa-87cc-32c78269a0a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/234","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:27.647Z","lastSeenAt":"2026-04-24T16:03:18.221Z"}],"details":{"listingId":"1556b6a9-572e-43aa-87cc-32c78269a0a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/234 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/234"},{"claim":"The platform advertises $0.02/request pricing 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":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium transaction data via a single micropayment","Programmatic pay-per-use API calls without subscription or API key management","Agent-driven API consumption where payment is embedded in the HTTP request"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can autonomously pay for API calls via x402","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.174Z"},"updatedAt":"2026-04-24T16:03:18.221Z"}}