{"id":"d6cbaf3b-3d0f-4077-8040-3fca37ffcf83","shortId":"EyhYmz","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/charges/259` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled entirely through the x402 header mechanism — no API keys, accounts, or rate limits are required.\n\nThe broader lowpaymentfee.com platform advertises a suite of 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 listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/259`) is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nThe endpoint is confirmed live: it returns a proper 402 challenge with x402 version 1, specifying the \"exact\" payment scheme, a 300-second timeout, and payment to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without further documentation or example responses, it is unclear what payload this specific endpoint returns upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment endpoint","crypto API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/charges/259 ('Premium API Access') is not described anywhere","No request or response schema is provided; callers cannot know what to send or what to expect back","The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/259","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/259","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the specific functionality behind '/api/v1/charges/259' is entirely undocumented. The docs, API, 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":"2026-04-19T03:34:00.892Z","embedding":[-0.022857666,-0.04309082,0.040740967,0.016967773,0.018737793,-0.023376465,-0.019119263,0.0357666,0.070251465,-0.06945801,0.036712646,-0.033996582,-0.041107178,-0.033111572,-0.03100586,0.011657715,-0.017730713,0.005180359,-0.05078125,0.027114868,0.025543213,-0.03729248,-0.01108551,0.03604126,0.0011796951,-0.029510498,-0.016540527,-0.016845703,-0.016952515,-0.04257202,0.02406311,-0.028060913,-0.009162903,0.0067596436,-0.019104004,-0.022537231,-0.009887695,0.036010742,0.030914307,-0.014373779,-0.0048103333,-0.05429077,0.0054779053,-0.00033164024,-0.049957275,-0.0024204254,0.010772705,-0.021514893,-0.0096588135,-0.0007305145,-0.02748108,-0.006713867,-0.010421753,0.0017347336,0.0151901245,0.021972656,0.004058838,-0.009208679,0.012458801,0.012825012,-0.0012254715,-0.06500244,-0.012825012,-0.012145996,0.00088357925,0.057128906,-0.012451172,0.046417236,0.0098724365,0.057647705,0.03778076,0.06008911,0.034057617,0.003534317,0.008972168,-0.006023407,0.0062446594,0.052703857,-0.014213562,-0.010559082,-0.027694702,-0.005065918,-0.048034668,-0.00491333,-0.016296387,-0.043182373,-0.026657104,0.015686035,-0.016296387,0.017059326,-0.072143555,0.0026798248,-0.013847351,0.0023593903,0.010124207,-0.0029563904,-0.0112838745,0.023086548,-0.011756897,0.018737793,0.021148682,-0.033721924,0.0096588135,0.011131287,0.041503906,0.05206299,0.033081055,0.032043457,-0.005657196,-0.012939453,-0.009544373,0.03488159,-0.022659302,-0.024429321,0.010093689,0.011390686,-0.010406494,0.015533447,-0.03201294,0.022384644,-0.051940918,0.038635254,0.0289917,-0.00907135,0.017715454,-0.041900635,-0.009429932,0.0084991455,-0.030593872,-0.013175964,0.022994995,0.012786865,0.03579712,-0.015602112,-0.03100586,0.012870789,-0.020080566,-0.032409668,-0.052246094,-0.039215088,0.03503418,-0.024978638,0.015022278,0.041137695,-0.09466553,0.0018196106,-0.051208496,0.004398346,-0.017211914,-0.014587402,-0.0065574646,0.03012085,-0.017044067,-0.0074882507,-0.02154541,-0.021011353,0.003227234,0.023498535,-0.022064209,0.043029785,-0.0095825195,0.029296875,0.013389587,0.0027103424,0.029434204,0.028778076,-0.008514404,-0.067993164,-0.09289551,-0.01576233,-0.0069122314,-0.01928711,-0.045928955,0.0019893646,-0.010887146,-0.07220459,-0.024597168,-0.014915466,0.0027618408,-0.03665161,-0.004432678,-0.029830933,0.016586304,0.0017986298,-0.07788086,-0.015426636,-0.016357422,0.07501221,0.02859497,0.011779785,0.032226562,-0.013679504,0.059387207,0.024536133,-0.025802612,-0.033599854,0.020706177,-0.0062942505,0.02909851,-0.00021350384,0.0044441223,-0.039886475,0.032714844,0.064941406,0.027328491,-0.022079468,-0.0013723373,-0.060821533,-0.03353882,-0.039031982,0.0020637512,-0.003189087,0.00021076202,0.0463562,-0.03942871,-0.03805542,0.0028572083,0.00059890747,0.016784668,0.051116943,0.008743286,-0.0047073364,0.019180298,0.018539429,-0.040130615,0.032592773,0.031982422,0.015029907,-0.022857666,-0.027374268,0.024765015,0.021118164,-0.029174805,0.007133484,-0.018005371,0.018371582,0.0025863647,0.017028809,0.03353882,-0.014717102,-0.02583313,-0.02458191,-0.0040397644,0.030700684,-0.0029850006,-0.026428223,-0.04058838,-0.076171875,0.05053711,0.030059814,0.039978027,0.0015163422,0.014831543,-0.032562256,-0.008934021,-0.07043457,0.060302734,0.07836914,-0.010955811,-0.016647339,0.0082473755,-0.014465332,-0.043426514,-0.006324768,-0.008331299,-0.03515625,-0.033203125,0.014663696,-0.04437256,0.0095825195,0.007160187,0.022521973,0.064941406,-0.01171875,-0.04598999,-0.028457642,0.002155304,0.0077285767,-0.023757935,0.0067863464,-0.019561768,0.015960693,0.020996094,-0.007030487,0.025634766,0.008888245,0.016311646,-0.0062942505,-0.0048294067,-0.028717041,-0.029876709,0.000243783,-0.02243042,-0.064697266,0.0008211136,0.008628845,0.05822754,-0.043182373,0.044036865,-0.0046539307,-0.0054359436,0.05960083,-0.011047363,-0.055511475,0.0181427,0.03024292,0.02218628,0.05215454,0.012145996,-0.026504517,-0.016052246,0.070617676,-0.024032593,-0.008766174,0.018936157,0.013259888,0.027008057,0.0028095245,-0.06707764,-0.035217285,-0.004272461,-0.035461426,0.023269653,-0.031280518,0.04067993,-0.0071525574,0.0056915283,-0.018676758,-0.006011963,-0.033447266,0.01625061,-0.02507019,0.01512146,-0.026412964,-0.021957397,0.02558899,0.007358551,-0.011528015,0.0077323914,0.049621582,0.037506104,-0.008171082,-0.03955078,-0.017547607,-0.013717651,-0.00774765,0.02772522,0.022537231,0.020217896,0.04901123,-0.04031372,0.029403687,0.035705566,0.017807007,0.034301758,-0.0012645721,0.009239197,-0.06567383,-0.06390381,-0.030273438,-0.03656006,0.0413208,0.0158844,-0.0017538071,0.0440979,0.008010864,-0.02947998,-0.03439331,0.02394104,-0.04788208,-0.007701874,0.04034424,-0.0070228577,-0.028381348,-0.008621216,0.0064582825,0.005065918,0.033233643,0.012886047,0.010620117,0.06561279,0.039978027,0.0025310516,0.020080566,0.018493652,0.026229858,-0.0027637482,-0.030883789,-0.025924683,-0.011909485,0.029006958,-0.019363403,-0.024993896,-0.064697266,0.052246094,0.047943115,0.08703613,0.027297974,0.0049819946,0.02507019,-0.009246826,0.015350342,-0.0234375,-0.01802063,-0.018325806,-0.050628662,0.025466919,-0.01776123,-0.019989014,-0.010444641,0.03326416,-0.0019216537,0.020233154,-0.032409668,0.05407715,-0.00013625622,-0.014045715,0.03265381,0.009750366,0.035125732,0.059753418,-0.042663574,0.024612427,0.032958984,-0.033996582,-0.0060310364,0.05517578,-0.016525269,-0.0036621094,-0.05645752,-0.011482239,0.0023765564,-0.017349243,-0.054016113,-0.00039982796,0.014030457,0.008705139,0.021240234,-0.009803772,-0.03414917,-0.0037059784,-0.019607544,-0.047546387,-0.013717651,-0.035980225,0.012008667,0.03744507,-0.03274536,0.0039253235,0.009513855,-0.017944336,0.0015850067,0.004585266,0.010971069,-0.01625061,-0.045135498,0.018936157,0.007411957,0.010978699,0.0020389557,0.03967285,0.022216797,0.02507019,0.046142578,0.009513855,-0.019424438,-0.057922363,0.028564453,-0.055541992,0.002450943,0.022598267,-0.016479492,-0.006061554,-0.011482239,-0.0127334595,-0.02659607,0.0076293945,-0.025848389,0.009651184,0.023620605,-0.029541016,-0.039398193,-0.05581665,-0.008140564,-0.009361267,0.046447754,0.02420044,0.0034294128,-0.07373047,-0.009880066,0.030853271,0.0037784576,0.015533447,-0.01499176,-0.016616821,-0.007713318,-0.0211792,-0.0069236755,-0.0025787354,0.011619568,-0.0070762634,-0.0149383545,0.039093018,-0.0019197464,0.022064209,-0.0054512024,0.020523071,0.040527344,-0.032470703,-0.012580872,-0.018844604,0.035949707,-0.0016822815,-0.01499176,-0.059539795,0.03274536,0.023345947,0.027435303,-0.036743164,-0.0004734993,-0.0065193176,0.011138916,0.021911621,-0.01637268,-0.010414124,-0.0064888,-0.047302246,-0.05908203,0.031311035,-0.02029419,0.032196045,0.013252258,0.004383087,0.019729614,-0.008300781,0.0060920715,0.016433716,-0.027832031,-0.0064353943,-0.023101807,-0.028884888,-0.016143799,-0.00045776367,-0.021011353,0.025405884,-0.0206604,0.021408081,-0.0031814575,-0.027542114,0.02180481,-0.006099701,0.00022566319,0.015899658,-0.004096985,0.01928711,0.045196533,0.014190674,-0.04434204,0.017990112,0.0012998581,0.011604309,-0.017807007,0.04144287,0.022842407,-0.009719849,-0.002149582,-0.0053977966,-0.014152527,-0.020248413,0.00006496906,0.009933472,0.030883789,-0.0063476562,-0.035186768,0.030593872,0.01889038,-0.03793335,-0.012077332,0.021591187,0.024108887,-0.033447266,0.035705566,0.03640747,0.062683105,-0.01399231,-0.0033493042,0.0103302,0.02822876,0.024734497,0.021820068,-0.013320923,0.019104004,-0.011642456,0.0206604,-0.0045700073,-0.007820129,0.010757446,-0.0007748604,0.020462036,0.021896362,0.003025055,-0.016571045,-0.0209198,0.011955261,-0.012451172,-0.012145996,0.025222778,0.022094727,0.018356323,-0.025039673,0.018417358,0.013061523,-0.02053833,-0.024017334,0.0023326874,0.035736084,-0.015350342,-0.018737793,0.012611389,0.008651733,0.0413208,-0.059326172,0.0024700165,0.005176544,0.006427765,-0.030014038,-0.044952393,-0.033813477,0.010169983,0.031921387,0.0066184998,0.01751709,0.031555176,0.010261536,0.0062408447,0.01826477,0.010734558,-0.010910034,-0.011428833,-0.037353516,-0.009391785,-0.015029907,0.0008363724,-0.027908325,0.0033855438,-0.012390137,-0.041015625,0.01550293,-0.017211914,-0.0002219677,-0.0043182373,0.008354187,0.04034424,0.0027542114,0.009117126,-0.018920898,-0.028137207,-0.00051498413,0.003030777,0.013389587,-0.04006958,0.0132751465,-0.017440796,-0.0058898926,0.00026226044,0.008659363,0.025161743,0.028900146,-0.0043411255,0.033081055,-0.042755127,0.03741455,-0.03149414,0.016021729,0.004722595,-0.04244995,-0.014503479,-0.026123047,-0.015556335,0.042663574,-0.022659302,-0.012367249,-0.022064209,-0.03414917,-0.0021915436,-0.051483154,0.015083313,0.03186035,0.0362854,-0.027252197,-0.00083112717,-0.0076293945,-0.0060157776,-0.01512146,0.006668091,-0.025665283,0.019592285,0.009056091,0.015266418,-0.037078857,-0.016433716,-0.015808105,0.0031776428,-0.049957275,-0.043762207,-0.020996094,0.010360718,-0.01953125,-0.009971619,-0.018447876,-0.027648926,-0.0076141357,-0.04916382,0.02381897,0.0070343018,0.025756836,0.006275177,-0.019317627,-0.0065078735,0.012710571,-0.0054130554,0.03390503,0.013389587,-0.01210022,-0.03289795,0.000053465366,0.027938843,0.03250122,0.007385254,-0.010292053,-0.015960693,-0.018737793,-0.053344727,-0.009750366,-0.014968872,-0.010528564,-0.009216309,0.010879517,-0.045776367,0.0055999756,-0.022888184,0.004737854,0.018508911,0.007858276,0.015357971,-0.0025100708,0.0033245087,-0.009559631,-0.02015686,-0.02708435,0.022521973,0.010688782,0.0015668869,0.0146865845,0.037322998,0.0006799698,-0.018218994,0.0056762695,-0.004825592,0.018936157,-0.02998352,0.010177612,-0.014953613,0.008079529,-0.014640808,-0.0015115738,-0.040924072,-0.0052108765,0.09277344,-0.008026123,-0.022766113,-0.0013380051,-0.02458191,0.018081665,0.022476196,-0.045532227,-0.009033203,-0.029220581,0.012481689,-0.02407837,0.029876709,0.0021038055,0.021133423,-0.022750854,-0.06518555,-0.0137786865,0.012939453,-0.01373291,-0.07348633,-0.017868042,-0.059295654,-0.0016059875,-0.0050201416,-0.018310547,0.003124237,0.01247406,-0.016098022,-0.10296631,0.010772705,0.04647827,0.008201599,0.02330017,-0.01638794,0.024505615,0.02381897,-0.031173706,-0.011886597,0.036254883,-0.028121948,-0.018493652,-0.023483276,0.018661499,-0.016616821,-0.021072388,0.029006958,0.0019073486,0.015388489,-0.01373291,0.0099487305,-0.019073486,0.011833191,-0.008659363,0.01701355,-0.009864807,-0.005794525,0.032196045,-0.050048828,0.031799316,0.02394104,0.005455017,-0.008415222,0.02079773,0.03741455,-0.04135132,-0.009239197,0.02659607,0.0001860857,0.044891357,-0.031341553,0.039031982,0.02067566,-0.0007300377,0.013809204,-0.014518738,-0.030670166,-0.027435303,-0.02619934,0.028961182,0.0053596497,0.017456055,-0.020965576,0.0023555756,0.014968872,-0.007904053,0.004589081,-0.012268066,-0.021331787,-0.0062217712,0.008361816,-0.000005543232,0.009902954,-0.004058838,0.026824951,0.015357971,0.041168213,0.008575439,-0.011222839,0.0015478134,0.02267456,-0.016693115,0.0016469955,0.015533447,0.0022907257,0.027542114,0.009063721,0.0032291412,-0.027694702,-0.021896362,-0.02267456,-0.0017127991,0.0027866364,-0.012809753,-0.013313293,-0.0021686554,0.0061302185,-0.013084412,-0.032348633,0.01096344,-0.029541016,-0.025100708,-0.011169434,-0.022125244,0.017105103,0.011680603,0.0031661987,0.01953125,-0.0036716461,0.05239868,0.0008301735,-0.0058059692,0.020309448,0.030776978,0.012664795,-0.027175903,-0.010948181,-0.010940552,0.005821228,-0.0013399124,-0.02420044,0.018554688,0.045410156,-0.006538391,0.01184082,-0.0057258606,0.027374268,-0.0073394775,0.01109314,-0.00983429,0.01524353,-0.009803772,0.029281616,-0.046051025,0.024124146,0.016952515,-0.005104065,-0.018920898,-0.010147095,-0.029220581,0.015731812,0.009689331,-0.011627197,0.057647705,-0.011291504,0.019317627,-0.027694702,-0.012954712,0.010475159,-0.036224365,-0.011581421,0.030410767,0.002922058,0.002243042,0.017410278,-0.03439331,0.030563354,-0.031921387,0.028167725,-0.013130188,0.0009717941,-0.006877899,-0.025039673,-0.027664185,-0.016921997,-0.009796143,0.01335144,-0.0095825195,0.03201294,0.017181396,0.034210205,0.04763794,0.017181396,0.010002136,-0.036102295,-0.027557373,0.0033931732,-0.028060913,0.014305115,-0.014884949,0.049072266,0.045776367,-0.0023822784,0.027038574,0.028717041,0.034332275,0.00774765,0.0063819885,-0.018875122,0.0031929016,-0.0009880066,0.018630981,0.0017461777,0.029937744,-0.021896362,0.019226074,0.011146545,0.031555176,-0.031921387,0.028778076,0.07495117,0.015083313,-0.0131073,0.041870117,-0.005264282,-0.015655518,-0.008903503,-0.020950317,0.061553955,0.0146484375,0.04763794,0.058654785,0.017425537,-0.011955261,0.023208618,-0.030700684,-0.031921387,0.066467285,0.017822266,-0.022766113,-0.016525269,-0.011161804,0.006839752,-0.051696777,-0.027008057,0.012680054,-0.009933472,0.016921997,-0.013824463,-0.0043411255,-0.0065193176,0.013648987,0.02659607,0.015548706,-0.018737793,0.021469116,0.029144287,0.013168335,0.01890564,-0.00932312,0.018218994,-0.028244019,-0.0134887695,0.00793457,0.011795044,-0.01701355,-0.010101318,0.02067566,0.0071792603,0.05493164,0.045684814,-0.017227173,0.011070251,0.031799316,0.01864624,-0.012176514,0.047454834,0.03845215,0.018463135,0.03125,0.035369873,0.02758789,-0.0362854,0.023025513,-0.0041389465,0.013397217,0.005428314,-0.005744934,0.012481689,-0.019607544,0.017044067,0.0014314651,-0.019683838,0.021850586,0.027664185,-0.011642456,-0.0010213852,-0.007160187,0.010299683,-0.016098022,0.0021629333,0.017211914,-0.018829346,0.027938843,0.0003118515,0.0236969,-0.037017822,0.031066895,-0.004463196,-0.024017334,-0.006072998,0.011688232,-0.043792725,-0.00018966198,0.0004746914,-0.0057678223,-0.048919678,0.007423401,0.026489258,-0.021133423,0.019302368,0.0061836243,0.0010480881,0.005420685,0.01979065,0.010375977,0.00094509125,-0.012840271,-0.017105103,0.033813477,0.04321289,0.005607605,0.015098572,-0.028701782,-0.0044822693,0.00749588,0.0025863647,-0.009513855,-0.0072746277,-0.02079773,-0.02545166,0.010665894,0.03778076,0.019866943,0.035095215,-0.007385254,-0.017456055,0.013214111,0.023147583,0.0017824173,-0.0067214966,-0.010047913,0.018493652,-0.0065193176,0.04724121,0.02798462,0.00258255,0.026397705,-0.008628845,-0.015220642,0.0060043335,-0.010215759,0.039215088,-0.017974854,0.0077323914,-0.0038928986,0.024261475,-0.021118164,-0.028427124,0.012496948,-0.010498047,-0.0154953,-0.021087646,-0.0027313232,0.0093307495,0.020401001,0.030059814,0.017059326,-0.025390625,0.07220459,-0.013900757,0.05178833,-0.0020427704,-0.006198883,0.039794922,0.02809143,0.040222168,0.004825592,0.008216858,-0.02784729,0.011207581,0.045928955,0.029144287,0.009506226,0.009803772,-0.02406311,0.032928467,-0.0005502701,0.030227661,-0.014152527,-0.001619339,0.00969696,-0.0068855286,-0.0047416687,0.009513855,-0.015914917,0.003900528,0.045928955,-0.028411865,-0.0047798157,-0.026138306,-0.016616821,0.027435303,-0.015083313,-0.00042009354,-0.0013809204,-0.016418457,0.017028809,-0.024505615,-0.027832031,0.012878418,0.02520752,-0.043640137,-0.024734497,0.0065193176,0.020050049,-0.02128601,0.033416748,0.028274536,0.00819397,0.0011949539,0.046813965,-0.015045166,0.037017822,-0.008674622,0.019805908,0.03012085,-0.00050735474,-0.022827148,0.0035305023,0.0016078949,-0.016403198,0.012756348,0.039154053,-0.009399414,0.012779236,0.002532959,-0.016998291,0.0064086914,0.0032081604,-0.017944336,-0.0015745163,-0.010169983,-0.012489319,0.0037708282,0.008460999,-0.003873825,0.003528595,-0.010002136,-0.013175964,0.007041931,0.030914307,0.0262146,-0.038635254,-0.000426054,0.014022827,0.008110046,-0.023086548,-0.021499634,0.00020778179,-0.035491943,0.014770508,0.016723633,0.0101623535,0.01210022,-0.02130127,0.0017642975,0.03262329,0.016113281,0.03262329,0.0036716461,0.00050497055,0.017349243,-0.014282227,0.0044403076,-0.010444641,-0.02142334,0.009803772,0.01586914,-0.0010032654,-0.02859497,0.028747559,0.008262634,0.024337769,0.005306244,-0.01876831,0.017333984,-0.008453369,-0.007785797,0.014228821,0.014205933,-0.0076942444,-0.012039185,-0.016662598,0.028640747,0.05569458,-0.0046920776,-0.012054443,0.021377563,0.018661499,0.016204834,0.03640747,0.009536743,0.043640137,0.027938843,-0.016906738,-0.013626099,0.023117065,-0.00605011,-0.03805542,0.01713562,-0.012489319,-0.018356323,0.017074585,0.021392822,-0.0074501038,-0.023727417,-0.021957397,-0.0110321045,-0.015899658,0.019241333,-0.018035889,0.013023376,-0.029281616,-0.0041542053,0.0103302,-0.018753052,-0.047027588,-0.015625,-0.0036792755,-0.00856781,-0.049743652,0.013648987,-0.03591919,0.003320694,-0.028198242,-0.015571594,-0.010635376,0.022781372,-0.019241333,-0.0016517639,0.016708374,0.024734497,0.027877808,0.014160156,0.018829346,-0.02545166,-0.035308838,-0.024719238,-0.0029315948,-0.020568848,0.022857666,0.00806427,0.034210205,0.0154800415,-0.010627747,-0.002090454,-0.011772156,-0.0011758804,-0.0022621155,-0.030014038,-0.01979065,0.022094727,0.022094727,-0.022476196,-0.025039673,0.039001465,-0.02758789,-0.018096924,0.027908325,0.040496826,0.0032577515,0.034423828,-0.017730713,-0.008163452,-0.019485474,0.0052223206,-0.01651001,0.0054740906,0.0039253235,0.0010938644,-0.0061531067,-0.0016784668,0.022323608,-0.004550934,-0.009338379,0.026657104,0.0052452087,-0.029190063,0.02166748,0.014007568,0.004283905,-0.0060043335,-0.009292603,0.02381897,0.045288086,0.01235199,0.0025997162,-0.004207611,0.012489319,-0.010307312,0.008796692,0.01979065,-0.017425537,-0.0413208,-0.024383545,-0.02407837,0.016494751,0.008720398,0.01574707,-0.004173279,0.012580872,-0.02671814,-0.027908325,-0.02267456,0.02722168,0.009994507,-0.008094788,-0.010223389,-0.0025806427,0.028884888,-0.031280518,0.0035171509,-0.032989502,-0.024780273,0.0018873215,-0.023452759,0.022094727,0.015113831,-0.004219055,0.0006160736,-0.0129470825,-0.009132385,0.0019445419,0.033081055,-0.017105103,-0.0016050339,0.023925781,0.010925293,-0.023406982,0.01159668,-0.014266968,-0.00680542,0.022750854,-0.010414124,0.009994507,-0.019805908,0.035858154,-0.0012807846,-0.0031280518,0.027755737,-0.008590698,0.012207031,-0.02848816,-0.0018720627,0.0035514832,0.001420021,0.030014038,-0.017623901,-0.018676758,0.004547119,-0.01676941,-0.037719727,-0.0024662018,0.02003479,0.04437256,-0.010559082,0.045410156,-0.020523071,-0.014884949,0.007827759,0.0070762634,-0.02507019,-0.004966736,0.026947021,0.003856659,0.0023536682,-0.00548172,-0.014701843,-0.033477783,-0.014007568,0.018508911,-0.0034713745,-0.013679504,0.017501831,0.011108398,0.045013428,0.0048446655,0.02494812,0.017974854,0.007965088,0.027114868,0.0016899109,0.048095703,-0.00032567978,-0.025238037,0.011581421,-0.0022640228,-0.021560669,-0.007080078,-0.008720398,-0.0009841919,-0.042022705,0.022384644,-0.00983429,0.02809143,-0.027297974,0.018798828,-0.028167725,0.00012934208,-0.03930664,-0.012771606,-0.030883789,0.014411926,0.03881836,-0.00409317,0.016342163,0.0037193298,-0.020050049,0.02607727,0.04397583,-0.00023031235,-0.024108887,-0.014190674,0.01322937,-0.0013332367,0.011161804,0.01386261,-0.008796692,-0.01701355,0.00011652708,-0.01739502,0.015075684,-0.00831604,0.010955811,0.008178711,-0.00082683563,-0.0010080338,0.0256958,-0.0006685257,-0.013076782,0.008903503,0.019714355,0.030334473,0.04019165,-0.01828003,0.02229309,0.02444458,-0.04208374,0.054138184,-0.005680084,0.022094727,-0.021224976,-0.008125305,-0.0335083,-0.028045654,-0.0007953644,0.009269714],"createdAt":"2026-04-18T18:44:43.003Z","updatedAt":"2026-04-24T00:31:56.049Z","lastSeenAt":"2026-04-24T00:31:56.049Z","tsv":"'/api/v1/charges/259':48,155 '/request':13,28 '0.02':12,27,70,145 '000':57 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x8335':62 '1':188 '20':56 '2913':63 '300':195 '402':183 '402 payment endpoint' '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,162 'account':89 'across':104 'address':201 'advertis':99 'ai':114 'analysi':118 'analyt':108 'api':6,21,37,87,161,212 'base':9,24,58,66 'broader':96 'call':4,19 'categori':106 'challeng':184 'charg':53 'classif':121 'confirm':177 'connect':221 'content':227 'convers':138 'crypto API access' 'data':107,111,169 'decim':76 'doc':211 'document':166,203,230 'embed':122 'endpoint':32,103,141,151,175,241 'entir':80 'equal':69 'estim':132 'exact':191 'exampl':232 'exchang':127 'export':112 'extrem':208 'feed':126 'financ':123 'four':105 'function':171 'gas':131 'generat':139 'geocod':136 'handl':79 'header':84 'howev':148 'infrastructur':134 'insight':113 'key':88 'label':157 'learn':116 'limit':92 'list':143,153 'live':178 'lowpaymentfee' 'lowpaymentfee.com':34,97 'machin':115 'mechan':85 'metric':109 'network':67 'no-api-key' 'page':216 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':238 'payment':42,77,192,199,245 'per':3,18,71,146 'platform':98 'post':50 'post-endpoint' 'premium':5,20,36,160 'price':125,213 'prompt':223 'proper':182 'protocol':43 'provid':35 'quot':130 'rate':91,128 'readm':215 'render':218 'report':110 'request':51,72,147 'requir':94 'resourc':46 'respons':233 'return':173,180,242 'scheme':193 'second':196 'sentiment':117 'site':206 'specif':45,150,240 'specifi':189 'substant':226 'success':244 'suit':101 'summar':120 'text':119 'thin':209 'timeout':197 'token':129 'unclear':236 'unit':59 'upon':243 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':135 'valid':137 'version':187 'via':10,25,39 'wallet':222 'web3':124 'without':228 'x402':11,26,41,83,186 'x402 API' 'x402-payment'","prices":[{"id":"dcea26cc-de4f-4079-980f-991eb272fbc2","listingId":"d6cbaf3b-3d0f-4077-8040-3fca37ffcf83","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/259","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:43.003Z"}],"sources":[{"listingId":"d6cbaf3b-3d0f-4077-8040-3fca37ffcf83","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/259","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:43.003Z","lastSeenAt":"2026-04-24T00:31:56.049Z"}],"details":{"listingId":"d6cbaf3b-3d0f-4077-8040-3fca37ffcf83","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/259 \\\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 402 with x402 version 1 challenge, maxAmountRequired 20000 USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/259"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/259"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API data without requiring account signup or API keys","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-use API access","Low-cost micropayment API consumption on Base L2"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring non-crypto payment methods (no fiat option available)","Use cases needing high-throughput batch access at volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.647Z"},"updatedAt":"2026-04-24T00:31:56.049Z"}}