{"id":"dddb12ee-9374-4fe8-8b65-cc8a2c02c8dd","shortId":"Dzcd55","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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 at `/api/v1/payments/163` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 the same $0.02/request price point. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nNote that the specific functionality behind the `/api/v1/payments/163` endpoint is unclear — the description is generic (\"Premium API Access\") and no request/response schema is documented beyond the x402 challenge. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation. Treat this listing with caution: the platform appears live but documentation is extremely thin.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no technical content.","The specific functionality of /api/v1/payments/163 ('Premium API Access') is not described anywhere; it is unclear what data or service it returns.","No request body schema or response schema is documented.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have visible documentation to verify actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/163","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/163","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 well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The specific purpose of the /payments/163 endpoint is undocumented beyond the generic label \"Premium API Access.\"","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":"2026-04-19T06:34:48.169Z","embedding":[-0.015640259,-0.034088135,0.042999268,0.015174866,0.0053138733,-0.034698486,-0.029693604,0.032287598,0.066345215,-0.070495605,0.008277893,-0.0446167,-0.0390625,-0.037841797,-0.027252197,0.018127441,-0.0038032532,-0.00051403046,-0.039215088,0.032440186,0.01499939,-0.020523071,-0.012374878,0.029464722,0.0005745888,-0.022964478,-0.007385254,-0.013824463,-0.018325806,-0.046203613,0.054626465,-0.024658203,-0.010978699,0.013214111,-0.024429321,-0.024429321,-0.0095825195,0.027053833,0.026748657,-0.0021896362,-0.010055542,-0.060943604,0.007709503,-0.0069007874,-0.04940796,0.009719849,-0.002702713,-0.026535034,0.0074157715,0.0061912537,-0.03152466,-0.014457703,-0.012237549,0.012130737,0.011817932,0.016616821,-0.0013170242,-0.012031555,0.018463135,0.017059326,0.001332283,-0.058135986,-0.018127441,-0.006755829,-0.0017557144,0.06365967,-0.008415222,0.04333496,0.00869751,0.07196045,0.029251099,0.046813965,0.027648926,0.0072631836,-0.0030612946,-0.013580322,0.01247406,0.059509277,-0.009765625,-0.018997192,-0.012229919,-0.015129089,-0.052825928,0.011993408,-0.01574707,-0.03555298,-0.015045166,0.020599365,-0.015045166,0.03274536,-0.06677246,-0.01739502,-0.011764526,0.00026464462,0.0046653748,-0.012969971,-0.013587952,0.024230957,-0.006137848,0.01360321,0.0009627342,-0.049316406,0.023864746,0.009628296,0.035858154,0.045715332,0.021499634,0.0231781,0.009162903,-0.0016441345,-0.043518066,0.024932861,-0.008277893,-0.017471313,0.024002075,0.01687622,-0.012359619,0.016357422,-0.03375244,0.016952515,-0.05493164,0.037506104,0.009033203,0.006538391,0.011161804,-0.048675537,-0.014511108,0.02204895,-0.017044067,-0.012512207,-0.0020599365,0.015174866,0.031677246,-0.010154724,-0.03161621,0.019683838,-0.01940918,-0.01586914,-0.04296875,-0.033050537,0.042510986,-0.024505615,0.021011353,0.035339355,-0.09222412,-0.0071258545,-0.04232788,0.007106781,-0.038513184,-0.0140686035,-0.0035533905,0.02760315,-0.0074043274,-0.011672974,-0.028503418,-0.028793335,0.0026664734,0.030319214,-0.01058197,0.04837036,-0.028396606,0.03338623,0.025024414,-0.004108429,0.024993896,0.021438599,-0.005317688,-0.08258057,-0.084228516,-0.008682251,-0.0093307495,-0.021026611,-0.028884888,0.012664795,-0.020904541,-0.06616211,-0.020904541,-0.020629883,-0.009292603,-0.03488159,0.004924774,-0.02734375,0.013175964,-0.009681702,-0.06365967,-0.013717651,-0.027175903,0.05795288,0.028457642,0.024124146,0.029754639,-0.022903442,0.052886963,0.024597168,-0.023895264,-0.023239136,0.023391724,-0.026062012,0.0071144104,-0.01474762,0.0082473755,-0.03866577,0.042144775,0.07165527,0.004257202,-0.018463135,-0.014060974,-0.056549072,-0.038146973,-0.031799316,0.024780273,0.0048980713,-0.006298065,0.03527832,-0.0440979,-0.02835083,0.0028896332,0.011642456,0.020111084,0.061035156,0.0026988983,-0.015472412,0.027908325,0.02468872,-0.056488037,0.033935547,0.039245605,0.020767212,-0.03463745,-0.014640808,0.029052734,0.03677368,-0.030441284,0.0289917,-0.014846802,0.026535034,-0.011444092,-0.000082969666,0.011741638,-0.014923096,-0.020996094,-0.0259552,-0.024978638,0.021865845,0.0059928894,-0.026824951,-0.026489258,-0.08630371,0.045684814,0.03378296,0.03768921,-0.0013580322,0.0040664673,-0.02180481,-0.0060806274,-0.07336426,0.06439209,0.078125,0.0036239624,-0.011367798,0.015975952,-0.016052246,-0.035461426,0.005924225,-0.009933472,-0.04058838,-0.016326904,0.010055542,-0.039215088,0.0118255615,0.028274536,0.021697998,0.04598999,-0.0017299652,-0.04171753,-0.016189575,-0.001373291,-0.006919861,-0.038879395,-0.007320404,-0.007827759,0.0070991516,0.026290894,-0.0007634163,0.014083862,0.002752304,-0.0019950867,-0.0019340515,0.005470276,-0.004535675,-0.034240723,0.016708374,0.0017795563,-0.058258057,0.0048446655,-0.005962372,0.07824707,-0.052703857,0.038360596,-0.012008667,0.009933472,0.053131104,-0.0014839172,-0.045928955,0.009864807,0.032348633,0.005142212,0.04421997,0.012184143,-0.033569336,-0.011581421,0.08251953,-0.014343262,-0.005973816,0.0075416565,0.012451172,0.023223877,-0.00019431114,-0.06100464,-0.040039062,0.012710571,-0.03475952,0.016525269,-0.026489258,0.027908325,-0.015457153,0.00068712234,-0.029129028,0.00040960312,-0.03717041,0.0140686035,-0.00484848,0.0051841736,-0.014831543,-0.021240234,0.019958496,0.021774292,-0.007209778,0.0039596558,0.036468506,0.025512695,-0.010627747,-0.034820557,-0.03930664,-0.01259613,-0.010253906,0.023986816,0.0209198,0.026519775,0.05014038,-0.04397583,0.011222839,0.02798462,0.008346558,0.032196045,-0.008270264,0.008811951,-0.07775879,-0.055389404,-0.023452759,-0.038726807,0.034484863,0.008308411,-0.014122009,0.062194824,0.015289307,-0.024261475,-0.037475586,0.018356323,-0.04763794,0.002796173,0.04815674,-0.012176514,-0.026565552,0.010093689,-0.008071899,0.0053138733,0.035583496,0.021621704,0.038879395,0.067993164,0.043945312,0.006450653,0.012901306,0.001991272,0.024505615,0.016021729,-0.016647339,-0.028320312,-0.019485474,0.04550171,-0.021942139,-0.014572144,-0.062927246,0.05581665,0.050354004,0.09259033,0.01474762,-0.00037503242,0.040649414,-0.017486572,0.021453857,-0.023452759,-0.023895264,-0.025054932,-0.049957275,0.03262329,-0.016143799,0.0045204163,-0.021408081,0.031677246,-0.006515503,0.0209198,-0.024597168,0.045715332,-0.012367249,-0.012084961,0.012466431,0.021835327,0.04736328,0.060791016,-0.037597656,0.015182495,0.014625549,-0.03390503,-0.00026226044,0.032714844,-0.009727478,-0.010040283,-0.052459717,-0.030471802,-0.0112838745,-0.006755829,-0.051086426,0.0043296814,0.0056419373,0.011779785,0.023925781,-0.017105103,-0.006286621,-0.01499939,-0.01612854,-0.051940918,0.0013742447,-0.03643799,-0.0062789917,0.04333496,-0.02709961,-0.013214111,-0.006450653,-0.001537323,0.0018806458,0.015304565,0.025894165,0.0006699562,-0.034240723,0.03237915,0.0073394775,0.0016813278,0.0059318542,0.035888672,0.014030457,0.031951904,0.056427002,0.013671875,-0.016113281,-0.057678223,0.03515625,-0.054351807,-0.007949829,0.022216797,-0.019226074,-0.00085020065,-0.01864624,-0.028167725,-0.038879395,0.0054397583,-0.03149414,0.005268097,0.023147583,-0.01285553,-0.019424438,-0.056274414,-0.01966858,-0.0024719238,0.056427002,0.021362305,0.007499695,-0.06585693,0.010108948,0.013496399,0.014701843,0.0390625,-0.014228821,-0.014060974,-0.016403198,-0.02671814,-0.012329102,-0.023910522,0.011726379,-0.0055160522,-0.010467529,0.021606445,0.01737976,0.016815186,0.0023956299,0.014083862,0.022872925,-0.024383545,-0.007522583,-0.0001218915,0.036254883,0.010971069,0.0037059784,-0.040802002,0.034210205,0.011856079,0.02798462,-0.046813965,-0.0022678375,-0.008987427,0.005760193,0.015510559,-0.00868988,-0.00762558,-0.017211914,-0.044952393,-0.07922363,0.045928955,-0.02418518,0.017654419,0.022567749,0.0019454956,0.017745972,0.0018024445,0.0015964508,0.012557983,-0.02607727,-0.00983429,-0.02067566,-0.027572632,-0.019104004,-0.012176514,-0.025161743,0.025024414,-0.016921997,0.023849487,0.003358841,-0.021636963,0.018493652,0.00554657,-0.0074691772,0.014190674,0.011154175,0.027175903,0.04043579,0.011268616,-0.039916992,0.012901306,0.00013101101,0.009590149,-0.005836487,0.044555664,0.031311035,-0.007144928,-0.0075912476,-0.01071167,-0.0141067505,-0.020690918,0.0068588257,0.008522034,0.012542725,-0.010810852,-0.03982544,0.0058174133,0.012145996,-0.03527832,-0.020645142,0.010383606,0.0037994385,-0.033447266,0.008781433,0.033996582,0.051696777,-0.023147583,-0.0013713837,0.003622055,0.028915405,0.028320312,0.00869751,-0.0149002075,0.020126343,-0.007144928,0.014694214,-0.0021305084,-0.0076522827,0.017822266,0.0060691833,0.017944336,0.019515991,0.0052757263,-0.024230957,-0.035614014,0.0037345886,-0.01953125,-0.029327393,0.026794434,0.017303467,0.030166626,-0.027511597,0.018753052,0.019088745,-0.018157959,-0.011962891,-0.015548706,0.03768921,-0.018844604,-0.017181396,0.01574707,0.012275696,0.037475586,-0.05215454,-0.00089740753,0.0019483566,0.0107040405,-0.028213501,-0.031677246,-0.040100098,0.011314392,0.033294678,0.012794495,0.018295288,0.036315918,0.004261017,0.0034008026,0.028808594,0.0031089783,-0.016708374,-0.0105896,-0.04296875,-0.016464233,-0.0061187744,-0.0025177002,-0.032440186,0.006149292,-0.006000519,-0.022705078,0.014419556,-0.0049858093,-0.007904053,-0.005126953,0.0040664673,0.050476074,0.007423401,0.017074585,-0.02029419,-0.037139893,-0.0056533813,0.005138397,0.016723633,-0.042633057,0.02027893,-0.008842468,-0.008872986,0.011398315,0.0020503998,0.013549805,0.026947021,0.011192322,0.029953003,-0.039367676,0.0524292,-0.041137695,0.013145447,0.0031795502,-0.036895752,-0.006641388,-0.027130127,-0.016036987,0.0395813,-0.032714844,-0.004962921,-0.027435303,-0.039367676,-0.007675171,-0.051727295,0.007843018,0.041992188,0.034484863,-0.031036377,0.0053977966,-0.003452301,0.008132935,-0.01159668,0.008384705,-0.0121536255,0.018356323,0.017364502,0.0017671585,-0.03869629,-0.029067993,-0.027053833,-0.002445221,-0.042999268,-0.048797607,-0.008476257,0.00036644936,-0.008300781,-0.017807007,-0.023284912,-0.03829956,-0.008560181,-0.04257202,0.0070991516,-0.001039505,0.014877319,-0.0013113022,-0.027252197,0.0031166077,0.01953125,-0.009277344,0.041900635,0.015670776,-0.00054216385,-0.047943115,0.017425537,0.008361816,0.010276794,-0.005672455,-0.013381958,-0.010322571,-0.020446777,-0.05657959,0.0007362366,-0.0070495605,-0.011878967,-0.009521484,-0.0017471313,-0.046142578,-0.005176544,-0.018920898,0.01121521,0.018798828,0.014755249,0.009254456,0.00207901,0.015434265,-0.00283432,-0.012168884,-0.027313232,0.019302368,0.010475159,0.00258255,0.028793335,0.04244995,0.009223938,-0.028503418,0.013542175,0.011314392,0.024536133,-0.019699097,0.0048065186,-0.020767212,0.011695862,-0.0039024353,-0.017501831,-0.03302002,-0.0019187927,0.09020996,0.006790161,-0.023162842,-0.009994507,-0.015975952,0.020736694,0.036712646,-0.0390625,-0.0012149811,-0.025894165,0.0155181885,-0.0256958,0.006629944,0.008590698,0.021148682,-0.013458252,-0.04751587,-0.011314392,-0.0037155151,-0.02557373,-0.052764893,-0.028427124,-0.06341553,0.004535675,-0.0067443848,-0.0066184998,-0.0031929016,0.00724411,-0.010124207,-0.083862305,0.0017147064,0.046295166,0.010124207,0.017837524,0.0019111633,0.020736694,0.019485474,-0.03286743,-0.00054979324,0.027023315,-0.032073975,-0.010627747,-0.02041626,0.013069153,-0.013916016,-0.014831543,0.004055023,0.005680084,0.018814087,-0.016677856,0.0047569275,-0.0102005005,0.014312744,-0.024780273,0.01889038,-0.007865906,-0.013450623,0.035339355,-0.04626465,0.02407837,0.011421204,-0.010368347,0.0028076172,0.027694702,0.041046143,-0.036987305,-0.010406494,0.024459839,0.012039185,0.034820557,-0.023956299,0.03741455,0.01448822,-0.018112183,0.020111084,-0.0066223145,-0.016189575,-0.032592773,-0.021652222,0.021499634,-0.0023441315,0.008605957,-0.020889282,0.012718201,0.019134521,-0.0012645721,0.012046814,-0.002374649,-0.032470703,-0.019104004,0.0032138824,-0.0018320084,-0.004360199,-0.0023479462,0.022323608,0.015914917,0.03857422,0.018936157,-0.011039734,-0.00039553642,0.036224365,-0.008979797,0.0046691895,0.026947021,-0.0032138824,0.015625,0.021606445,0.014198303,-0.047668457,-0.013412476,-0.021377563,-0.02935791,-0.008956909,-0.005680084,-0.01802063,-0.016311646,0.011108398,-0.009880066,-0.029953003,0.011383057,-0.026138306,-0.02671814,-0.0020713806,-0.009262085,0.02861023,-0.0012340546,0.014007568,0.008003235,-0.0014019012,0.041503906,0.0019607544,-0.022247314,0.03933716,0.036895752,0.010238647,-0.031143188,-0.006500244,-0.008308411,-0.01071167,0.00006455183,-0.045318604,0.017791748,0.04953003,-0.020599365,0.0052719116,-0.0020942688,0.029754639,-0.0034828186,0.007255554,-0.00843811,0.012084961,-0.01121521,0.041229248,-0.048065186,0.024749756,0.009353638,0.0057754517,-0.019607544,0.000415802,-0.035186768,0.019683838,0.0065841675,-0.012123108,0.056549072,-0.0013132095,0.023986816,-0.02142334,-0.018997192,0.009475708,-0.031799316,-0.023910522,0.030700684,-0.002779007,-0.0078048706,0.01436615,-0.026229858,0.042144775,-0.02746582,0.024551392,0.0062446594,-0.005027771,-0.002828598,-0.021728516,-0.007106781,-0.00944519,-0.018066406,0.008239746,-0.0056877136,0.04260254,0.01890564,0.029647827,0.062805176,0.015777588,-0.0073013306,-0.036132812,-0.03137207,0.006931305,-0.0155181885,0.015853882,-0.009094238,0.06561279,0.031066895,0.0034294128,0.03692627,0.02470398,0.036102295,0.013122559,0.0070152283,-0.013008118,0.012672424,-0.0018854141,0.041137695,-0.002626419,0.039398193,-0.038482666,0.022445679,0.017623901,0.019515991,-0.03579712,0.029205322,0.06652832,0.014656067,-0.016159058,0.04373169,-0.00541687,-0.00447464,-0.02003479,-0.020614624,0.05230713,0.010108948,0.053741455,0.057006836,0.021591187,-0.0003736019,0.021850586,-0.02519226,-0.030517578,0.055358887,0.02154541,-0.02368164,-0.014862061,-0.005722046,0.00026893616,-0.047210693,-0.028533936,0.029922485,-0.011955261,0.001335144,-0.01058197,-0.009979248,-0.012939453,0.0044822693,0.019729614,0.017120361,-0.015701294,0.028213501,0.037994385,0.0009393692,0.028060913,0.0038032532,0.02746582,-0.020263672,-0.030914307,0.016311646,0.021743774,-0.015457153,-0.012817383,0.023040771,0.007965088,0.041534424,0.045135498,-0.019821167,0.012145996,0.033721924,0.0075416565,-0.014305115,0.060272217,0.04156494,0.015419006,0.042907715,0.026229858,0.043273926,-0.040893555,0.0129852295,0.004886627,-0.0010147095,-0.014274597,-0.010635376,-0.0002937317,-0.01876831,0.01838684,-0.0066871643,-0.018859863,0.017120361,0.02935791,-0.0071792603,-0.012641907,-0.0043258667,0.015182495,-0.020233154,-0.0031318665,0.014144897,-0.022247314,0.036254883,0.0090789795,0.028533936,-0.023590088,0.021728516,-0.00072193146,-0.009521484,-0.008674622,0.027282715,-0.02331543,0.011138916,-0.013542175,0.0071907043,-0.048797607,0.015838623,0.034362793,-0.016830444,0.022445679,0.011940002,-0.0012693405,-0.0088272095,0.013656616,0.0042037964,0.0002360344,-0.013244629,-0.023269653,0.027679443,0.047821045,-0.0007658005,0.0066184998,-0.018493652,-0.015197754,0.0024223328,-0.006603241,-0.004016876,-0.003967285,-0.0234375,-0.01751709,0.012863159,0.034973145,0.022872925,0.059509277,-0.022003174,-0.009231567,0.012138367,0.030685425,0.011756897,0.0028915405,-0.0074043274,0.02067566,-0.013954163,0.0496521,0.038757324,0.016311646,0.03515625,-0.009597778,-0.016220093,0.0064201355,-0.0079422,0.016418457,-0.015289307,0.0025310516,-0.00038957596,0.035339355,-0.01084137,-0.032409668,0.014160156,-0.012428284,-0.021438599,-0.019683838,0.010299683,0.002943039,0.031219482,0.04498291,0.018966675,-0.024749756,0.0635376,-0.0074882507,0.045654297,0.004272461,-0.011116028,0.04751587,0.014564514,0.029586792,0.018112183,0.015258789,-0.03363037,0.017410278,0.03717041,0.03173828,0.013175964,0.0033359528,-0.014701843,0.034179688,0.005756378,0.033935547,-0.012771606,0.00843811,0.007904053,-0.0044784546,-0.0061798096,-0.0012083054,-0.007461548,0.008880615,0.040252686,-0.032470703,-0.013381958,-0.024734497,-0.0017766953,0.03189087,-0.022537231,0.008110046,-0.005680084,-0.026306152,0.013175964,-0.024002075,-0.030426025,0.0016679764,0.0206604,-0.03741455,-0.012557983,-0.0020637512,0.01612854,-0.026992798,0.026916504,0.02671814,0.0026988983,0.012466431,0.05053711,-0.014343262,0.027679443,-0.018600464,0.03717041,0.037597656,0.005012512,-0.01763916,-0.010368347,0.012130737,-0.009475708,0.011871338,0.04147339,-0.014381409,0.0028495789,-0.004043579,-0.0049743652,0.0021343231,0.004837036,-0.009017944,0.008796692,-0.005760193,-0.0030841827,-0.009002686,0.002494812,0.00023889542,0.005783081,0.0045700073,-0.00818634,0.013717651,0.034332275,0.022384644,-0.040496826,-0.012832642,0.009994507,0.012672424,-0.015014648,-0.011367798,0.0033035278,-0.036865234,0.017852783,0.013954163,0.014953613,0.014122009,-0.03390503,0.002861023,0.015625,0.015457153,0.018096924,0.009292603,-0.008041382,0.017501831,-0.0035915375,-0.0040359497,-0.00054979324,-0.004573822,0.011306763,0.0284729,-0.0074310303,-0.030960083,0.01902771,-0.0008211136,0.01448822,0.0050582886,-0.017303467,0.022247314,0.0026130676,-0.005683899,0.009552002,0.012512207,-0.008041382,-0.011398315,-0.01436615,0.033233643,0.051696777,-0.0070343018,-0.005962372,0.023483276,0.016067505,0.019866943,0.044891357,0.0031738281,0.038238525,0.03744507,-0.016708374,-0.014251709,0.02178955,-0.007534027,-0.030426025,0.018341064,-0.015312195,-0.019851685,0.01789856,0.006931305,0.0005221367,-0.026504517,-0.006275177,-0.0069122314,-0.010284424,0.013397217,-0.016921997,0.0068740845,-0.021026611,-0.009712219,0.0009908676,-0.025680542,-0.05142212,-0.020095825,-0.0013875961,-0.0072021484,-0.055725098,0.007411957,-0.02949524,0.013717651,-0.026901245,-0.0073661804,-0.011329651,0.014007568,-0.017547607,-0.008346558,0.0058555603,0.028274536,0.01928711,0.010322571,0.025100708,-0.03024292,-0.017059326,-0.027420044,0.0060043335,-0.01940918,0.019805908,0.00724411,0.032989502,0.017944336,-0.006729126,-0.0024528503,-0.012939453,-0.0077934265,-0.020248413,-0.0158844,-0.026519775,0.029876709,0.016296387,-0.013214111,-0.010536194,0.04336548,-0.032226562,-0.017974854,0.03314209,0.041809082,0.0154800415,0.027908325,-0.018615723,-0.0115356445,-0.014511108,-0.003686905,-0.02128601,0.010658264,0.018936157,0.004764557,-0.009635925,0.010765076,0.02532959,-0.008323669,-0.009918213,0.026687622,0.006790161,-0.008865356,0.045013428,0.007347107,0.0039711,-0.008224487,-0.01474762,0.017120361,0.04849243,0.015304565,0.012184143,-0.0030956268,0.0044136047,-0.012619019,0.010986328,0.013198853,-0.019515991,-0.047912598,-0.018249512,-0.026977539,0.014160156,0.0016889572,0.01626587,-0.010101318,0.013885498,-0.024002075,-0.030426025,-0.017913818,0.030548096,0.013397217,-0.0104904175,-0.012123108,0.015029907,0.015571594,-0.036132812,0.002281189,-0.04437256,-0.035491943,0.004753113,-0.02458191,0.027053833,0.013977051,-0.0010385513,-0.0029563904,-0.009925842,0.0006222725,-0.0118637085,0.026397705,-0.012367249,-0.0057411194,0.0423584,0.01146698,-0.013969421,0.017227173,-0.0055732727,-0.003540039,0.016952515,-0.007331848,0.008903503,-0.024307251,0.036865234,-0.01360321,0.0014858246,0.03579712,-0.011398315,0.006313324,-0.03652954,0.009887695,0.0019369125,-0.008262634,0.03579712,-0.035461426,-0.015838623,0.0062789917,-0.028121948,-0.031219482,0.008590698,0.014274597,0.035583496,-0.009017944,0.045562744,-0.019729614,-0.013061523,0.01625061,0.0093688965,-0.013755798,0.001953125,0.024978638,0.004840851,-0.009101868,-0.015274048,-0.0061912537,-0.038482666,-0.005870819,0.010147095,-0.002105713,-0.014060974,0.026824951,0.005393982,0.037139893,-0.0053482056,0.012138367,0.014625549,0.016021729,0.02708435,0.0033130646,0.04888916,-0.017181396,-0.035888672,-0.0014486313,0.008735657,-0.020187378,-0.0048675537,-0.010368347,0.0021381378,-0.037963867,0.012191772,-0.009506226,0.029541016,-0.032684326,0.008132935,-0.023727417,-0.0025234222,-0.044647217,-0.024002075,-0.021347046,0.012298584,0.03010559,0.0017881393,0.024887085,0.009643555,-0.020996094,0.013580322,0.04824829,-0.00793457,-0.026641846,-0.0181427,0.010231018,0.0019683838,0.0048675537,0.013839722,-0.022277832,-0.012191772,0.010803223,-0.021102905,0.0051345825,-0.0033054352,0.017120361,0.0069007874,-0.0040664673,-0.0075416565,0.031555176,-0.0051841736,-0.018051147,0.015350342,0.009597778,0.043945312,0.03277588,-0.01737976,0.017868042,0.016662598,-0.040008545,0.059509277,0.0075263977,0.019485474,-0.016479492,-0.0005030632,-0.034057617,-0.023071289,-0.016067505,0.0027389526],"createdAt":"2026-04-18T18:49:35.960Z","updatedAt":"2026-04-24T06:32:15.766Z","lastSeenAt":"2026-04-24T06:32:15.766Z","tsv":"'/api/v1/payments/163':61,171 '/request':13,30,151 '0.02':12,29,71,150 '000':75 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':161 '20':74 '402 payment API' '6':81 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,181 'account':86 'addit':207 'address':157 'advertis':91,105 'ai':117 'analysi':121 'analyt':111 'api':5,15,22,32,42,65,84,107,180 'appear':217 'attach':94 'base':8,25,55,76,163 'behind':169 'beyond':188 'broader':103 'call':4,21,73 'caller':92 'categori':108 'caution':214 'challeng':191 'charg':68 'classif':124 'connect':202 'convers':141 'crypto-paid API' 'data':110,114 'decim':82 'descript':176 'doc':193 'document':187,209,220 'embed':125 'endpoint':59,144,172 'estim':135 'exchang':130 'export':115 'extrem':222 'feed':129 'financ':126 'function':168 'gas':134 'generat':142 'generic':178 'geocod':139 'header':98 'includ':109 'infrastructur':137 'insight':116 'json-response' 'key':16,33,85 'label':63 'learn':119 'limit':89 'list':146,212 'live':218 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':118 'metric':112 'multipl':106 'network':56 'no-api-key' 'note':164 'page':197 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,97,154 'per':3,20,40,72 'platform':6,23,43,104,216 'point':153 'premium':64,179 'price':128,152,194 'prompt':204 'protocol':48 'quot':133 'rate':88,131 'readm':196 'report':113 'request':41,101 'request/response':184 'requir':17,34 'return':199 'schema':185 'sentiment':120 'settl':155 'simpli':93 'specif':58,167 'summar':123 'technic':208 'text':122 'thin':223 'token':132 'treat':210 'unclear':174 'unit':77 'usdc':9,26,51,79,160 'usdc-base' 'use':45,159 'util':138 'valid':140 'via':10,27 'wallet':203 'web3':127 'x402':11,28,47,96,190 'x402 API' 'x402-payment'","prices":[{"id":"2a7619ef-0fa6-401f-9fa4-e3e8ae28a987","listingId":"dddb12ee-9374-4fe8-8b65-cc8a2c02c8dd","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:35.960Z"}],"sources":[{"listingId":"dddb12ee-9374-4fe8-8b65-cc8a2c02c8dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/163","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:35.960Z","lastSeenAt":"2026-04-24T06:32:15.766Z"}],"details":{"listingId":"dddb12ee-9374-4fe8-8b65-cc8a2c02c8dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/163 \\\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 challenge with maxAmountRequired of 20000 USDC base units (=$0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/163"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/163"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without creating an account or managing API keys","Making one-off paid API calls settled instantly via USDC on Base","Agent-driven workflows that need frictionless per-request billing"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Prototyping workflows that need instant, keyless API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production use cases where $0.02/request adds up and bulk pricing is needed","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.397Z"},"updatedAt":"2026-04-24T06:32:15.766Z"}}