{"id":"8e16f6fc-af87-4886-a6cf-a7c5de2378f2","shortId":"bDP3fx","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","description":"This endpoint serves NFT metadata for token ID 81 on the lowpaymentfee.com platform. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/nfts/81/metadata` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely through the x402 payment header. The payment timeout is 300 seconds.\n\nThe provider's landing page lists a uniform $0.02/request price across all endpoints and emphasizes a no-commitment, no-minimum model. Documentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available, so the actual structure of the NFT metadata response is unknown.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-call NFT","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","The /api, /pricing, and /README pages all return only a wallet-connect prompt with no useful content.","The specific NFT collection and what metadata fields are returned are undocumented.","This endpoint is for a single token ID (81); it is unclear how to query other token IDs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/81/metadata","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/nfts/81/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no example payloads, and no documentation beyond a marketing landing page. The actual content of the NFT metadata response is completely unknown.","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":"2026-04-21T23:49:51.766Z","embedding":[-0.025482178,-0.015487671,0.071777344,-0.009757996,-0.005569458,-0.02142334,0.012268066,0.024658203,0.032958984,-0.051330566,0.020095825,-0.013389587,-0.052368164,-0.06829834,-0.018218994,0.011886597,-0.028060913,-0.007411957,-0.04248047,0.035339355,0.033996582,-0.0017938614,-0.026535034,0.04107666,-0.02017212,-0.021453857,-0.026168823,-0.0019664764,0.008682251,-0.003534317,0.03010559,-0.019897461,-0.0027446747,0.011886597,-0.018127441,0.009796143,-0.0018396378,0.0036640167,0.013130188,-0.025344849,0.0020427704,-0.048797607,0.008407593,-0.014892578,-0.035949707,-0.027038574,0.005214691,-0.0052108765,0.01260376,0.018188477,-0.017333984,0.00198555,-0.019134521,0.010932922,-0.0025463104,0.019683838,0.0017251968,-0.008636475,0.019210815,0.01713562,0.028701782,-0.07122803,-0.016494751,0.014137268,-0.0152282715,0.046539307,-0.028305054,0.03933716,-0.002073288,0.06890869,0.041046143,0.058807373,0.016143799,0.0020141602,-0.0027332306,-0.033599854,-0.012580872,0.07409668,-0.033050537,-0.03692627,-0.011779785,-0.014404297,-0.04006958,-0.02015686,-0.025314331,-0.023468018,-0.018295288,0.0064735413,-0.027114868,0.036895752,-0.08453369,-0.0034484863,-0.037322998,0.01626587,-0.012741089,-0.004589081,-0.0010480881,0.008453369,0.026016235,0.006576538,-0.024963379,-0.017501831,0.0013074875,-0.0009627342,0.026168823,0.039916992,0.025390625,0.023132324,0.005126953,0.002653122,-0.046325684,0.012023926,-0.019470215,-0.022964478,0.0008535385,0.00014317036,-0.05581665,0.038024902,-0.009674072,0.03262329,-0.044067383,0.041015625,0.0030231476,0.0055007935,-0.008132935,-0.03866577,-0.01965332,0.029800415,-0.01574707,-0.0018796921,0.054870605,-0.009437561,0.015014648,-0.024673462,-0.039642334,-0.012039185,-0.040008545,-0.050811768,-0.046875,-0.0019664764,0.0052337646,-0.011146545,0.031463623,0.026855469,-0.09613037,-0.0041160583,-0.029571533,0.024475098,-0.036865234,0.008720398,-0.004940033,0.025405884,-0.008338928,-0.038146973,0.016983032,-0.053222656,0.0078048706,-0.00025582314,-0.0020618439,0.056121826,0.010910034,0.027191162,0.024932861,-0.0055160522,0.049316406,0.033447266,0.0014839172,-0.07373047,-0.065979004,-0.005153656,0.0046157837,-0.017333984,-0.003704071,-0.019424438,0.0026474,-0.059143066,-0.003753662,-0.030456543,0.022216797,-0.031433105,0.010055542,-0.051574707,0.005832672,0.0015802383,-0.0592041,-0.010299683,-0.02268982,0.07550049,0.042114258,0.027236938,-0.005542755,0.007411957,0.03225708,0.01675415,-0.032287598,-0.035614014,0.01259613,-0.033233643,0.032226562,-0.0012722015,0.034332275,0.0028190613,0.04437256,0.05645752,-0.003156662,-0.0046081543,-0.023880005,-0.08959961,-0.043029785,-0.0026302338,0.028015137,0.030822754,-0.007850647,0.003419876,-0.029830933,-0.018417358,-0.0046539307,0.012336731,0.0039863586,0.026184082,0.010917664,-0.010185242,0.023590088,0.010505676,-0.03274536,0.039093018,-0.0036258698,-0.00014269352,-0.00009793043,-0.040252686,0.027877808,0.022232056,-0.018859863,0.018920898,-0.04034424,0.02418518,-0.026779175,-0.012336731,0.0002682209,0.0015640259,0.009048462,-0.04019165,-0.015823364,0.021453857,-0.028579712,-0.008308411,-0.0418396,-0.057006836,0.03555298,0.053771973,0.010017395,0.016418457,-0.009681702,-0.031829834,0.00034737587,-0.066467285,0.05831909,0.07354736,-0.011444092,-0.009033203,0.02835083,-0.015487671,-0.03781128,-0.007858276,-0.02015686,-0.046661377,0.0013237,-0.0016832352,-0.046661377,-0.0017881393,0.009498596,0.005382538,0.023880005,-0.044647217,-0.051818848,0.0060691833,-0.0035629272,-0.0066108704,-0.010940552,-0.027740479,0.010253906,0.017089844,0.027313232,-0.002981186,-0.0006875992,-0.008735657,0.020462036,0.012535095,0.030059814,-0.0017633438,-0.0135650635,0.009811401,0.023239136,-0.025344849,-0.013221741,-0.024169922,0.06591797,-0.050201416,0.028305054,-0.01171875,-0.00014948845,0.017211914,0.006149292,-0.039154053,-0.002281189,0.017745972,0.026412964,0.036987305,0.0020103455,-0.027801514,0.025787354,0.07080078,-0.03994751,-0.0029563904,0.019226074,0.014442444,0.036254883,0.0028629303,-0.034057617,-0.017944336,0.010421753,-0.04058838,0.050354004,-0.026931763,0.016586304,-0.009849548,0.00026392937,-0.016845703,-0.00207901,-0.013595581,0.016296387,-0.019134521,0.009681702,-0.025527954,0.0073394775,0.007232666,0.013893127,-0.020706177,0.01373291,0.035736084,0.06201172,-0.030654907,-0.046325684,-0.02281189,-0.034851074,0.011856079,0.0019187927,0.02029419,0.008010864,0.04046631,-0.031219482,-0.010147095,0.03277588,0.009025574,0.040863037,0.030975342,-0.0069084167,-0.059143066,-0.03488159,-0.027526855,-0.039733887,0.032287598,0.018859863,-0.013801575,0.059509277,-0.027236938,-0.034942627,-0.046966553,0.026687622,-0.06939697,-0.04119873,0.030349731,-0.023162842,-0.012229919,0.011962891,0.0069503784,0.016326904,0.016098022,0.034057617,0.0045051575,0.06286621,0.021957397,0.0016946793,0.010627747,0.025817871,0.025619507,0.010116577,-0.028427124,-0.030578613,-0.035736084,0.038635254,-0.017974854,-0.0345459,-0.040374756,0.05770874,0.05178833,0.08105469,0.0121536255,0.015686035,0.061462402,-0.014167786,0.0025939941,-0.035217285,-0.011329651,-0.031982422,-0.013893127,0.026916504,0.0012102127,0.018051147,-0.04168701,0.018676758,-0.0059051514,0.024520874,0.005554199,0.053375244,0.012710571,-0.015098572,0.03488159,0.016540527,0.046569824,0.068115234,0.0038909912,0.045898438,-0.0009150505,-0.062927246,0.0036811829,0.023071289,-0.013954163,-0.0020313263,-0.059448242,-0.035583496,0.025100708,0.0034065247,-0.038208008,-0.0046424866,0.011711121,0.033172607,0.05026245,-0.00617218,-0.017791748,-0.018859863,-0.019424438,-0.06738281,0.011619568,-0.05166626,-0.0058898926,0.041412354,-0.005138397,0.014503479,-0.018478394,0.0009384155,0.005428314,0.0060310364,0.013977051,0.011291504,-0.022613525,0.00919342,0.002122879,0.03314209,0.009429932,0.02909851,0.02267456,0.048431396,0.023071289,0.011650085,-0.03692627,-0.06109619,0.052215576,-0.03149414,-0.008514404,0.039611816,-0.0002529621,0.004432678,-0.013626099,-0.012084961,-0.035095215,0.03378296,-0.02658081,0.015289307,0.019012451,-0.013008118,-0.0335083,-0.057647705,-0.014030457,-0.04345703,0.052337646,0.032226562,0.0077934265,-0.04058838,-0.018798828,0.021118164,0.007068634,0.034729004,-0.013114929,-0.024002075,-0.024673462,-0.037109375,0.0076179504,-0.022521973,0.014663696,-0.01576233,-0.0068893433,0.039245605,0.023910522,0.0031433105,0.015136719,0.007785797,0.028961182,-0.026062012,0.019729614,0.02204895,0.052734375,0.0007481575,-0.0034637451,-0.03881836,0.030700684,0.00566864,0.039001465,-0.03668213,0.0026474,-0.0039024353,0.034729004,0.024856567,-0.037597656,0.023529053,-0.015365601,-0.046203613,-0.06933594,0.048095703,-0.004459381,0.033843994,0.0014944077,0.007873535,0.03375244,-0.011810303,0.0040283203,0.032409668,-0.032165527,-0.023239136,-0.026382446,-0.037475586,-0.020614624,-0.013031006,-0.027130127,0.030578613,-0.009963989,0.012817383,0.0047836304,-0.015403748,0.00207901,0.014007568,-0.007270813,0.032104492,0.011512756,0.03253174,0.057922363,0.020614624,-0.030578613,0.038208008,0.014587402,0.00012874603,-0.0028266907,0.045135498,0.049346924,0.016815186,0.0064582825,0.00012278557,0.020095825,-0.02268982,-0.007545471,0.00030374527,-0.017303467,0.014167786,-0.022232056,-0.0054969788,-0.0023899078,-0.019760132,-0.0146865845,0.008102417,0.01776123,-0.021209717,0.012588501,0.033050537,0.04647827,-0.028015137,0.011039734,0.009056091,0.05142212,0.031585693,0.0057411194,-0.009811401,0.016418457,0.005065918,0.028182983,0.01689148,-0.007587433,0.03100586,0.01663208,0.025421143,0.026184082,0.016036987,-0.015930176,-0.030853271,-0.008766174,-0.00026392937,-0.018661499,0.037597656,0.01525116,0.019195557,0.007858276,0.006877899,0.0030078888,-0.008903503,-0.030197144,-0.0007481575,0.03326416,-0.005794525,-0.027709961,0.0036945343,0.024002075,0.014503479,-0.03967285,-0.0056152344,0.013839722,0.015670776,-0.030227661,-0.059295654,-0.038909912,-0.022445679,0.018188477,0.0057792664,0.0013475418,0.029434204,-0.0013198853,-0.013244629,0.012321472,0.017425537,-0.0051574707,-0.012329102,-0.029174805,0.0072517395,-0.008811951,-0.0055732727,-0.0042381287,-0.009521484,-0.03918457,-0.037872314,0.008453369,-0.017730713,-0.016204834,-0.0079422,-0.009521484,0.008514404,-0.0099105835,0.016952515,-0.016143799,-0.025985718,-0.004085541,0.00017404556,0.032684326,-0.028884888,0.018310547,-0.011550903,0.028961182,-0.0129470825,0.011306763,0.014038086,0.028778076,0.02571106,0.019226074,-0.041412354,0.034851074,-0.05227661,0.04562378,0.010894775,-0.026641846,0.013900757,-0.024459839,-0.02255249,0.037719727,-0.02420044,-0.015235901,0.006340027,-0.06817627,-0.0066947937,-0.052825928,0.025985718,0.016784668,0.03540039,-0.013267517,0.011924744,-0.0013046265,0.0046157837,-0.019866943,0.0050468445,-0.009422302,0.014266968,0.039886475,0.013832092,-0.014923096,-0.0116119385,-0.0020503998,-0.019836426,-0.044799805,-0.027404785,-0.005329132,0.0010795593,0.0053482056,0.016662598,-0.02357483,-0.037109375,0.0031661987,-0.029678345,0.026184082,0.0011234283,-0.0025024414,0.011138916,-0.009056091,-0.014923096,0.012290955,-0.023880005,0.040161133,0.026062012,0.0129470825,-0.023513794,-0.008895874,0.03918457,0.025787354,-0.0010480881,-0.004333496,-0.009124756,-0.030578613,-0.053863525,0.0040664673,-0.0013036728,0.026306152,0.0047035217,-0.013130188,-0.04815674,0.007686615,-0.032958984,0.002368927,0.011054993,-0.0029201508,0.015510559,-0.0033607483,-0.011749268,-0.023910522,-0.009284973,-0.019241333,-0.0017318726,0.009048462,-0.0046463013,0.020889282,0.058258057,-0.011482239,0.010498047,-0.0009918213,-0.012466431,0.011459351,-0.012214661,-0.0026893616,-0.017837524,0.004299164,-0.0064468384,-0.021820068,-0.04486084,0.014328003,0.06109619,-0.0025196075,-0.020645142,-0.002418518,-0.029632568,0.0065841675,0.037078857,-0.027755737,-0.0054969788,-0.043426514,0.029052734,-0.01235199,0.012489319,-0.011695862,0.02758789,-0.023925781,-0.03060913,0.0038909912,-0.03253174,-0.00033211708,-0.050933838,-0.024642944,-0.05807495,0.017120361,-0.022033691,-0.02923584,-0.0079193115,0.02507019,-0.018615723,-0.075927734,-0.00055360794,0.04196167,-0.00024843216,0.019546509,-0.0043754578,0.02468872,0.022277832,0.00021314621,-0.0011920929,0.011253357,-0.01499176,-0.0054473877,-0.020111084,0.016082764,0.025863647,-0.027435303,0.02053833,0.010444641,0.024124146,-0.0101623535,0.02835083,-0.03149414,-0.00018715858,-0.0060310364,0.007282257,-0.019744873,0.0021743774,0.05606079,-0.071899414,0.0262146,0.023269653,-0.0063323975,0.00945282,0.014923096,0.029281616,-0.032989502,-0.010147095,0.02078247,0.006790161,0.04373169,-0.0231781,-0.009811401,0.01651001,-0.022109985,0.0006632805,-0.0048713684,-0.010879517,-0.060913086,-0.026657104,0.017059326,0.019958496,-0.02029419,-0.018447876,0.011001587,0.0035533905,0.003768921,0.009780884,-0.028503418,-0.014724731,-0.032470703,0.01763916,0.011924744,-0.009605408,-0.033721924,0.023468018,0.036102295,0.009506226,0.011444092,-0.010131836,0.005039215,0.012931824,-0.00049734116,-0.020095825,0.029724121,0.007320404,0.013145447,0.020507812,0.017974854,-0.039978027,-0.019485474,-0.011039734,0.0037975311,0.011268616,-0.0009689331,0.009887695,-0.003753662,0.017547607,-0.013938904,-0.023025513,-0.008110046,-0.021453857,-0.0234375,0.0036716461,-0.025558472,0.014724731,-0.010734558,-0.009651184,0.012023926,-0.00045084953,0.03012085,0.000323534,-0.013465881,0.02583313,0.036499023,0.017303467,-0.04598999,0.007904053,-0.025253296,-0.012641907,0.007686615,-0.038604736,0.014038086,0.024368286,-0.011985779,0.013145447,0.0058250427,0.024597168,0.0029335022,0.0027256012,0.016082764,0.01373291,-0.023513794,0.033477783,-0.0440979,0.026779175,0.015129089,0.011260986,-0.02583313,-0.022949219,-0.024841309,0.023635864,0.017242432,-0.0013179779,0.027877808,-0.01940918,0.03427124,-0.02017212,-0.029922485,0.0107803345,-0.019882202,-0.0019836426,0.013267517,-0.0008816719,0.009094238,0.02432251,-0.028701782,0.018371582,-0.007144928,0.0015764236,-0.0008687973,-0.032287598,-0.0033226013,-0.0021343231,-0.0067329407,-0.026184082,-0.018112183,-0.00054883957,-0.028076172,0.061950684,0.028152466,0.010437012,0.024490356,0.01234436,0.019577026,-0.025863647,-0.021606445,0.0033817291,0.0007176399,0.02885437,-0.030532837,0.030944824,0.041229248,-0.0056495667,0.047668457,0.023223877,0.03543091,0.018325806,0.024337769,-0.024246216,-0.011856079,-0.02848816,0.0045661926,-0.0211792,0.0491333,-0.022232056,0.002609253,0.0067634583,0.02748108,-0.008178711,0.015655518,0.053466797,0.011222839,-0.0005245209,0.04043579,0.018722534,-0.01890564,-0.016174316,-0.0011072159,0.043060303,0.013092041,0.042022705,0.036254883,-0.0074310303,-0.00009202957,-0.0069465637,-0.022369385,-0.016708374,0.03704834,0.044708252,-0.0020503998,0.004020691,-0.023590088,-0.0181427,-0.04748535,-0.028900146,0.02255249,0.0041999817,0.0093307495,-0.015525818,-0.008552551,-0.0077705383,0.04611206,0.011886597,0.0069503784,-0.020187378,0.029312134,0.03201294,0.0043563843,0.020950317,-0.006877899,-0.00356102,-0.02885437,-0.031707764,0.020217896,0.031585693,-0.02053833,-0.013183594,0.013191223,0.007019043,0.023132324,0.007381439,-0.027664185,-0.0042419434,0.00076007843,0.007972717,-0.01121521,0.044281006,0.032806396,0.014190674,0.030776978,0.03213501,0.017913818,-0.037322998,0.0141067505,-0.010063171,0.0064849854,0.010261536,0.018539429,0.03665161,-0.011520386,0.030303955,0.005065918,-0.017074585,0.015426636,0.010025024,0.0099487305,-0.022979736,0.013870239,0.007369995,-0.014328003,-0.005378723,0.0036029816,-0.0049819946,0.013931274,0.03475952,0.023239136,-0.020248413,0.037322998,0.0035076141,-0.007545471,-0.013092041,0.033355713,-0.06994629,-0.0087509155,-0.008636475,0.0010652542,-0.03942871,0.02078247,0.036590576,-0.005783081,-0.0067481995,0.006225586,-0.013145447,0.008720398,0.009689331,0.02015686,0.0008068085,0.0012903214,-0.036102295,0.024124146,0.035583496,-0.00554657,-0.011817932,-0.01348114,0.024932861,0.0056915283,-0.010772705,-0.011207581,0.019454956,-0.013664246,-0.022338867,0.007835388,0.018981934,0.021316528,0.027755737,-0.0078048706,-0.013763428,0.014503479,0.031982422,0.0063552856,-0.012687683,-0.023986816,0.039367676,-0.03387451,0.05029297,0.03793335,-0.008369446,0.036376953,0.011680603,-0.015090942,-0.0028743744,-0.015335083,0.03491211,-0.011306763,-0.008415222,0.0008134842,0.015571594,-0.016860962,-0.03060913,-0.006866455,-0.019073486,-0.020858765,-0.029251099,0.007911682,-0.0034236908,0.0118637085,0.047332764,0.029052734,-0.007499695,0.056762695,-0.0077171326,0.033599854,-0.019134521,0.0031318665,0.060791016,0.0073394775,0.058563232,0.02394104,0.020095825,-0.037841797,0.007965088,-0.0034828186,0.0017290115,0.024597168,0.024459839,-0.014541626,0.04333496,-0.005466461,0.031021118,0.02078247,0.003566742,0.0052452087,-0.010009766,-0.009780884,0.0026054382,-0.010147095,0.01876831,0.030426025,-0.048217773,0.018493652,-0.02999878,-0.01525116,0.01953125,0.010147095,-0.0017004013,-0.0052604675,-0.00844574,0.008102417,-0.016906738,-0.014503479,0.009239197,0.0059394836,-0.050750732,-0.0010118484,0.021896362,0.01626587,-0.016021729,0.018722534,0.06750488,-0.00009071827,-0.0051078796,0.02810669,-0.016998291,0.035583496,-0.006061554,0.022338867,0.017456055,-0.0011959076,-0.021636963,-0.0029315948,0.018829346,-0.023147583,-0.0045776367,0.023040771,0.013496399,0.00844574,0.025985718,0.011245728,-0.012535095,0.008544922,-0.008621216,0.014404297,-0.036621094,-0.016906738,0.019134521,0.008163452,0.022247314,0.026565552,-0.011405945,-0.010848999,0.028884888,0.018066406,0.016708374,-0.042388916,-0.000021576881,0.022781372,0.0019741058,-0.026779175,-0.0063056946,0.010322571,-0.03744507,-0.0033855438,0.027801514,-0.0075645447,0.018173218,-0.042785645,-0.0069465637,0.035858154,-0.0054359436,0.020858765,0.023880005,-0.014213562,0.031341553,-0.015960693,-0.006996155,-0.01436615,-0.0064849854,0.022720337,0.027755737,-0.022521973,-0.03173828,0.023971558,-0.013641357,0.010131836,0.01852417,0.0035133362,0.022216797,-0.0131073,0.018936157,0.0046691895,0.018463135,-0.02243042,-0.015838623,0.0035266876,0.022338867,0.023666382,-0.028259277,-0.022750854,0.025985718,0.025146484,0.012268066,0.027114868,0.014579773,0.032318115,0.010620117,-0.006664276,-0.008239746,-0.0060043335,-0.013404846,-0.013130188,0.02027893,-0.021347046,-0.025405884,0.042633057,0.022140503,-0.016204834,-0.03616333,-0.003528595,-0.007633209,-0.011619568,0.0357666,0.013900757,0.03744507,0.003484726,-0.023452759,0.015686035,-0.026184082,-0.042175293,-0.002702713,0.006996155,-0.005569458,-0.050720215,-0.005367279,-0.008964539,0.03277588,-0.024093628,-0.013053894,0.0013227463,0.009346008,0.0051956177,-0.01789856,-0.010757446,0.021377563,-0.008003235,0.006877899,0.029708862,-0.009521484,-0.04196167,-0.048828125,0.029953003,-0.023910522,0.038360596,0.004951477,0.027740479,0.012161255,0.007007599,0.0056762695,-0.006225586,-0.008956909,0.00003761053,-0.03363037,-0.049316406,0.019226074,0.029006958,-0.007587433,-0.01902771,0.030181885,-0.012413025,-0.007865906,0.045654297,0.049835205,0.012199402,0.017562866,0.0037136078,-0.0037975311,-0.018966675,0.011390686,-0.023864746,-0.0000718236,-0.004611969,0.003238678,0.0058937073,0.007926941,0.008377075,-0.01763916,-0.01914978,0.018325806,0.025939941,0.024124146,0.016555786,0.023513794,-0.011505127,-0.0181427,-0.023391724,-0.0049819946,0.019577026,0.011444092,0.036895752,0.011070251,0.0006427765,-0.009025574,0.020935059,0.010696411,-0.01675415,-0.04232788,-0.020401001,-0.043884277,0.034301758,0.0034389496,0.008712769,-0.004459381,0.00687027,-0.018966675,-0.04849243,-0.007751465,0.02947998,0.015991211,-0.0021247864,-0.014350891,-0.010559082,-0.0037059784,-0.033233643,0.004749298,-0.042266846,-0.04119873,-0.002500534,-0.010299683,0.013717651,-0.010864258,-0.0072517395,0.003622055,-0.0011119843,-0.009361267,-0.018661499,0.020111084,-0.012702942,-0.01727295,0.0026226044,0.02999878,-0.02017212,0.0048713684,-0.022842407,0.006679535,0.032287598,-0.005783081,0.03604126,-0.028625488,0.017501831,-0.0027751923,-0.0049209595,0.01826477,-0.0049324036,0.02067566,-0.012290955,0.0040740967,0.0048828125,-0.0041046143,0.026565552,-0.026184082,-0.03604126,0.0067634583,-0.011138916,-0.02218628,-0.00017619133,-0.0007748604,-0.0018014908,-0.009880066,0.043060303,-0.033355713,-0.02520752,0.0231781,-0.002861023,-0.015716553,0.0038871765,0.025390625,0.003145218,-0.014328003,-0.004436493,-0.014862061,-0.04034424,-0.008781433,-0.005622864,-0.0234375,0.014450073,0.017227173,0.0017032623,0.05645752,0.0039711,0.020736694,0.026504517,0.00674057,0.022338867,0.010971069,0.043823242,-0.0135269165,-0.019302368,-0.007381439,0.005001068,-0.03250122,0.017578125,-0.01977539,-0.029006958,-0.017105103,0.025863647,-0.00045990944,0.028427124,0.025665283,0.007762909,-0.033447266,0.009880066,-0.022491455,-0.024795532,-0.035736084,0.020965576,0.046844482,-0.00031256676,0.007904053,-0.0077438354,-0.015167236,0.036193848,0.039916992,-0.0062828064,-0.054718018,-0.03390503,0.038879395,-0.0026874542,0.013793945,0.006008148,-0.0060806274,0.007835388,-0.006259918,-0.015312195,0.014190674,-0.016159058,0.0073013306,0.014923096,0.011955261,-0.008514404,0.04837036,-0.023666382,-0.004497528,0.0027999878,-0.004425049,0.04425049,0.029632568,-0.009757996,0.012809753,0.0038223267,-0.025253296,0.047973633,-0.0099105835,0.0025367737,0.010848999,0.0025978088,-0.026779175,-0.0259552,-0.0014772415,0.0011548996],"createdAt":"2026-04-21T18:32:28.691Z","updatedAt":"2026-04-22T11:33:08.029Z","lastSeenAt":"2026-04-22T11:33:08.029Z","tsv":"'/api':180 '/api/v1/nfts/81/metadata':91 '/pricing':181 '/readme':183 '/request':16,32,157 '0.02':15,31,118,156 '000':107 '0x8335':112 '20':106 '2913':113 '300':146 '6':123 '81':41 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':92 'access':133 'across':159 'actual':214 'addit':195 'advertis':101,132 'ai/ml':67 'analyt':66 'api':58,126 'avail':211 'base':5,21,85,108,115 'base-network' 'beyond':173 'broader':51 'call':9,25 'challeng':100 'commit':167 'connect':191 'cost':104 'data':65 'decim':124 'detail':197 'document':172,206 'emphas':163 'endpoint':3,19,34,74,89,161 'equal':117 'exampl':209 'finance/web3':69 'grant':135 'header':141 'id':40 'infer':68 'infrastructur':71 'json':97 'json-response' 'key':127 'land':151,175 'limit':130 'list':153 'lowpaymentfee.com':44 'maximum':103 'metadata':2,18,37,219 'minimum':170 'model':171 'network':86 'nft':1,17,36,218 'nft-metadata' 'no-commit':165 'no-minimum':168 'offer':59 'on-chain metadata' 'openapi':201 'page':152,176 'part':48 'pay':7,23,55 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':54 'payload':210 'payment':78,140,143 'per':8,24,56,119 'platform':45 'post':93 'price':158 'prompt':192 'protocol':79 'provid':63,149 'pure':136 'rate':129 'request':57,94,120 'request/response':204 'resolv':186 'respons':220 'return':96 'rout':184 'schema':205 'second':147 'serv':35 'settl':80 'span':64 'spars':178 'spec':202 'specif':88 'structur':215 'suit':52 'technic':196 'timeout':144 'token':39 'token metadata' 'uniform':155 'unit':109 'unknown':222 'usdc':13,29,82,111,121 'usdc-settlement' 'use':75,122 'util':72 'via':10,26 'wallet':190 'wallet-connect':189 'x402':11,27,77,99,139 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"216e93a2-58fb-46c9-9f47-4708c74ce837","listingId":"8e16f6fc-af87-4886-a6cf-a7c5de2378f2","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/nfts/81/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.691Z"}],"sources":[{"listingId":"8e16f6fc-af87-4886-a6cf-a7c5de2378f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/81/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.691Z","lastSeenAt":"2026-04-22T11:33:08.029Z"}],"details":{"listingId":"8e16f6fc-af87-4886-a6cf-a7c5de2378f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/81/metadata \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/nfts/81/metadata"},{"claim":"The provider lists uniform $0.02/request pricing with no API keys, no rate limits, and no minimums across all endpoints.","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint accepts POST requests and returns application/json as declared in the x402 challenge.","source_url":"https://lowpaymentfee.com/api/v1/nfts/81/metadata"}],"useCases":["Retrieving metadata for NFT token #81 programmatically","Integrating NFT display data into a dApp or marketplace","Agents that need on-demand NFT metadata without API key management"],"bestFor":["Developers needing keyless, pay-per-call NFT metadata access","AI agents with x402-compatible wallets on Base","Quick one-off metadata lookups without subscription overhead"],"notFor":["Bulk retrieval of metadata for large NFT collections (no batch endpoint documented)","Users who need detailed API documentation or OpenAPI specs before integrating","Free-tier or non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.297Z"},"updatedAt":"2026-04-22T11:33:08.029Z"}}