{"id":"c732dfe2-6bd3-4e0f-acd2-15821fa442a7","shortId":"nUEhJH","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 x402-enabled endpoint at lowpaymentfee.com serves NFT metadata for a given token (in this case token ID 100) via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The advertised price is $0.02 per request (maxAmountRequired of 20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing and x402 payment model on Base.\n\nDocumentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. The specific structure of the NFT metadata response is unknown. Callers should expect a JSON response (mimeType: application/json) but will need to discover the exact schema experimentally.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","x402 NFT endpoint","Base USDC API","pay-per-request NFT","lowpaymentfee","402 payment NFT"],"warnings":["No OpenAPI or schema documentation available — response format must be discovered experimentally","The /api, /pricing, and /README pages return only a wallet-connect prompt with no useful content","The specific NFT collection and token ID space served by this endpoint are undocumented","Provider appears to be a demo/showcase site; reliability and data quality are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/100/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/100/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the /api, /pricing, /README pages are empty wallet-connect stubs. The actual NFT metadata format is entirely 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":"2026-04-21T23:22:36.450Z","embedding":[-0.026901245,-0.022781372,0.05709839,-0.009590149,0.0015287399,-0.03274536,0.007888794,0.01876831,0.03112793,-0.060516357,0.029373169,-0.025161743,-0.0418396,-0.05996704,-0.017745972,0.0027809143,-0.009101868,0.000011444092,-0.03805542,0.026870728,0.03173828,0.0006918907,-0.02583313,0.019561768,-0.014694214,-0.023986816,-0.032287598,-0.007858276,0.0024204254,-0.006095886,0.03704834,-0.020141602,-0.00052165985,0.0007352829,-0.020080566,-0.016586304,0.002571106,-0.0032539368,0.009155273,-0.026184082,0.008575439,-0.04260254,0.0119018555,-0.00617218,-0.03869629,-0.023162842,0.005710602,-0.009605408,0.016204834,0.011001587,-0.02670288,-0.0012931824,-0.0076446533,0.012130737,-0.0010967255,0.022872925,-0.0063705444,-0.009231567,0.016296387,0.020339966,0.020126343,-0.078186035,-0.01361084,0.0132751465,-0.01197052,0.058135986,-0.030700684,0.036590576,-0.0006542206,0.07458496,0.044525146,0.061798096,0.029006958,-0.0011644363,0.008644104,-0.042266846,-0.0055770874,0.06695557,-0.040863037,-0.038604736,-0.0063552856,-0.019332886,-0.047821045,-0.018936157,-0.027435303,-0.029022217,-0.0076408386,0.0116119385,-0.027618408,0.039764404,-0.08496094,-0.016021729,-0.029663086,0.0073013306,-0.0006837845,-0.0020389557,-0.019058228,0.010650635,0.026977539,0.014274597,-0.019943237,-0.020309448,0.013671875,-0.0017061234,0.031402588,0.04345703,0.027420044,0.025482178,0.0059127808,-0.0046653748,-0.04788208,0.015426636,-0.014328003,-0.024505615,0.006465912,-0.00066137314,-0.05038452,0.038024902,-0.008255005,0.028060913,-0.04537964,0.046813965,0.010940552,0.0020503998,0.010726929,-0.04269409,-0.018554688,0.024810791,-0.005683899,0.0026950836,0.038909912,0.0032920837,0.014175415,-0.029449463,-0.04107666,-0.006298065,-0.049316406,-0.057891846,-0.05001831,-0.020217896,0.01626587,-0.023086548,0.021057129,0.032684326,-0.092163086,-0.009811401,-0.03503418,0.025161743,-0.02810669,0.008056641,-0.00724411,0.016342163,-0.012329102,-0.024093628,0.012611389,-0.044830322,0.0064201355,0.008338928,0.0027160645,0.051361084,-0.0032749176,0.020690918,0.030441284,-0.0012521744,0.04031372,0.028625488,0.0017108917,-0.06506348,-0.07128906,0.00092458725,0.0020542145,-0.020019531,-0.00422287,-0.0017566681,-0.021835327,-0.051818848,-0.004207611,-0.02671814,0.024490356,-0.030975342,-0.009880066,-0.052520752,0.0051498413,0.00084114075,-0.052612305,-0.016311646,-0.026535034,0.07513428,0.040222168,0.029968262,-0.008331299,0.012741089,0.038269043,0.017700195,-0.04525757,-0.018203735,0.018875122,-0.02243042,0.012649536,-0.002790451,0.036712646,-0.0019187927,0.03930664,0.05203247,-0.0072250366,-0.0126953125,-0.020309448,-0.0847168,-0.038909912,-0.009681702,0.032470703,0.012184143,0.0006403923,0.015609741,-0.03286743,-0.016433716,0.00095796585,0.00579834,0.0064086914,0.047698975,0.004081726,-0.010917664,0.030960083,0.010467529,-0.057800293,0.028823853,0.0024967194,0.00018763542,-0.0146865845,-0.04067993,0.026229858,0.030700684,-0.012954712,0.030059814,-0.035858154,0.01676941,-0.038482666,-0.015045166,0.007183075,-0.0021266937,-0.015899658,-0.037902832,-0.021240234,0.017227173,-0.02418518,-0.012123108,-0.031311035,-0.074523926,0.03869629,0.0423584,0.010108948,0.012237549,-0.01121521,-0.03439331,0.0024471283,-0.07458496,0.050933838,0.06652832,-0.007663727,-0.022628784,0.03024292,-0.018066406,-0.04345703,-0.0021419525,-0.012290955,-0.05142212,-0.0071754456,-0.0034980774,-0.050842285,-0.0029773712,0.011634827,0.013595581,0.035980225,-0.03753662,-0.053649902,0.009666443,-0.015426636,-0.004211426,-0.008560181,-0.036132812,0.0026416779,0.0017261505,0.04067993,-0.0056762695,-0.0054893494,-0.0042266846,0.023330688,0.009727478,0.029647827,-0.002412796,-0.0010557175,0.011764526,0.018951416,-0.039001465,-0.022491455,-0.021835327,0.07788086,-0.052124023,0.04147339,-0.017486572,0.008964539,0.037628174,0.009033203,-0.03967285,0.00047516823,0.014732361,0.018615723,0.03152466,0.0056648254,-0.033966064,0.013931274,0.06732178,-0.040527344,-0.0043678284,0.013687134,0.013435364,0.04257202,-0.00019431114,-0.05343628,-0.033203125,0.007255554,-0.047576904,0.041107178,-0.038208008,0.014694214,-0.007293701,0.00699234,-0.022415161,-0.0029907227,-0.0135269165,0.014633179,-0.0005412102,0.011184692,-0.013572693,0.008415222,0.0067443848,0.018920898,-0.020401001,0.01222229,0.048065186,0.06121826,-0.02835083,-0.034057617,-0.03665161,-0.035827637,-0.013397217,0.0065689087,0.020263672,0.009048462,0.037963867,-0.032073975,-0.009719849,0.029251099,0.021621704,0.045898438,0.019485474,-0.0026416779,-0.07043457,-0.028305054,-0.037902832,-0.033081055,0.035736084,0.033203125,-0.007286072,0.05444336,-0.013946533,-0.020050049,-0.0340271,0.006477356,-0.0670166,-0.02885437,0.03933716,-0.029815674,-0.006717682,0.015853882,0.006198883,0.02571106,0.02973938,0.019714355,0.014389038,0.07281494,0.021392822,-0.0151901245,-0.0017442703,0.014762878,0.028945923,0.016296387,-0.025146484,-0.03942871,-0.042907715,0.036956787,-0.022705078,-0.039764404,-0.04333496,0.050445557,0.05795288,0.08862305,0.01638794,0.015914917,0.05923462,-0.006996155,0.0020999908,-0.030654907,-0.014572144,-0.04272461,-0.019638062,0.035614014,-0.0007658005,0.022415161,-0.030441284,0.026031494,-0.014030457,0.021194458,0.006259918,0.028182983,0.015151978,-0.0206604,0.03164673,0.025299072,0.05126953,0.06750488,0.0011930466,0.049194336,0.000916481,-0.06890869,0.00059461594,0.01675415,-0.009552002,-0.00818634,-0.058929443,-0.04751587,0.02758789,0.013717651,-0.05206299,-0.0082092285,0.009590149,0.027618408,0.041046143,0.005191803,-0.0096588135,-0.020080566,-0.024917603,-0.06500244,-0.0057373047,-0.05343628,-0.01020813,0.030578613,-0.004501343,-0.00020265579,-0.019302368,0.012268066,0.0039634705,0.023071289,0.019302368,0.008773804,-0.04421997,0.01626587,0.0015964508,0.017852783,0.00894928,0.024963379,0.024215698,0.037506104,0.027191162,0.007286072,-0.022476196,-0.07122803,0.04562378,-0.028427124,-0.007850647,0.042266846,-0.019241333,-0.009811401,-0.01737976,-0.018463135,-0.030807495,0.03186035,-0.03186035,-0.0012140274,0.0259552,-0.0079422,-0.039764404,-0.05883789,-0.018005371,-0.030410767,0.05203247,0.010108948,0.0058784485,-0.025878906,-0.011146545,0.012840271,-0.0009403229,0.03164673,-0.012931824,-0.021057129,-0.0076408386,-0.032562256,0.011734009,-0.015655518,0.017242432,-0.01966858,-0.014762878,0.028213501,0.023742676,0.00434494,0.008331299,0.01058197,0.021713257,-0.012626648,0.01777649,0.02041626,0.06286621,0.0046081543,-0.0036182404,-0.03793335,0.027862549,0.005657196,0.036376953,-0.03756714,0.0019626617,-0.0038852692,0.027114868,0.017669678,-0.03250122,0.0209198,-0.015777588,-0.04849243,-0.06542969,0.03967285,-0.0026073456,0.026748657,0.0038013458,0.003993988,0.028060913,-0.008712769,0.010055542,0.027893066,-0.026855469,-0.016601562,-0.032592773,-0.039123535,-0.020553589,-0.016784668,-0.027313232,0.036621094,-0.01663208,0.013786316,0.002779007,-0.018005371,0.0067481995,0.013748169,-0.021774292,0.028900146,0.0051994324,0.027435303,0.055236816,0.018875122,-0.027420044,0.0231781,0.020904541,0.0032138824,-0.0049476624,0.045959473,0.04663086,0.020935059,0.006755829,-0.010169983,0.01713562,-0.024368286,-0.003358841,-0.010253906,-0.019256592,0.011802673,-0.031829834,-0.011985779,0.0010328293,-0.023269653,-0.013076782,0.002122879,0.012710571,-0.01878357,0.016494751,0.03765869,0.04827881,-0.040527344,-0.004348755,0.0065078735,0.04257202,0.032592773,-0.0027427673,0.0075149536,0.014144897,-0.0041389465,0.01158905,0.018127441,-0.020141602,0.031158447,0.016693115,0.024383545,0.01902771,0.020401001,-0.0102005005,-0.03753662,0.0042037964,-0.0020713806,-0.01448822,0.043884277,0.014724731,0.014350891,0.00415802,-0.0006170273,0.0014352798,-0.0065193176,-0.024841309,-0.006061554,0.02998352,-0.0057411194,-0.026870728,0.007858276,0.02128601,0.023269653,-0.040771484,-0.015899658,0.007671356,0.013053894,-0.027435303,-0.046966553,-0.038879395,-0.026062012,0.021209717,0.0079422,0.0013179779,0.031311035,0.008026123,-0.0064048767,0.014549255,0.014213562,-0.010658264,-0.01927185,-0.028289795,-0.0047454834,-0.011543274,-0.00141716,-0.011245728,-0.0079574585,-0.032592773,-0.03717041,0.0102005005,-0.0070343018,-0.0104522705,-0.0057373047,-0.009033203,0.021148682,-0.008728027,0.013687134,-0.01499176,-0.02746582,-0.0064888,-0.00048065186,0.03326416,-0.036254883,0.013153076,-0.016738892,0.02973938,-0.012878418,0.009712219,0.02180481,0.032440186,0.022323608,0.027664185,-0.038269043,0.033599854,-0.05859375,0.031311035,0.019897461,-0.030258179,0.013587952,-0.029785156,-0.023406982,0.040130615,-0.029693604,-0.010795593,-0.013435364,-0.06500244,-0.012069702,-0.049682617,0.034301758,0.013328552,0.03955078,-0.013931274,0.008773804,-0.007926941,0.0047950745,-0.028335571,0.01574707,-0.0037117004,0.013893127,0.037750244,0.022628784,-0.023010254,-0.017288208,-0.01184845,-0.0059814453,-0.0385437,-0.030654907,-0.016036987,-0.008811951,0.0046195984,0.012229919,-0.02330017,-0.036010742,0.005340576,-0.020202637,0.02027893,0.008216858,0.0026016235,0.018295288,-0.013175964,-0.007663727,0.018936157,-0.014511108,0.0368042,0.027191162,0.011650085,-0.024856567,-0.0009264946,0.026779175,0.020202637,-0.012039185,-0.004589081,-0.002380371,-0.027252197,-0.042633057,0.0016021729,0.011642456,0.015106201,0.00038290024,-0.0059318542,-0.04550171,0.007167816,-0.01751709,0.013870239,0.01876831,0.004760742,0.014465332,-0.0008482933,0.00024223328,-0.02734375,-0.01322937,-0.022720337,0.011985779,0.0087509155,-0.0061187744,0.023010254,0.052520752,-0.018173218,-0.0045318604,-0.0029945374,-0.0033245087,0.009773254,-0.008369446,-0.0018367767,-0.026229858,0.01651001,-0.004798889,-0.026672363,-0.04257202,0.010063171,0.06542969,0.0022621155,-0.027786255,-0.0037517548,-0.023666382,0.01058197,0.033996582,-0.02658081,-0.0000061392784,-0.044677734,0.026062012,-0.017684937,0.012794495,-0.008285522,0.025466919,-0.008529663,-0.032714844,-0.0071754456,-0.03845215,-0.0045661926,-0.04650879,-0.025161743,-0.066711426,0.022491455,-0.014091492,-0.03942871,-0.0056266785,0.031829834,-0.027252197,-0.07122803,-0.00299263,0.051361084,-0.0012168884,0.026138306,0.00055217743,0.029373169,0.023605347,-0.0013189316,-0.0032634735,0.010467529,-0.023208618,-0.0069351196,-0.030181885,0.009750366,0.01878357,-0.020065308,0.010559082,0.008575439,0.016799927,-0.014663696,0.014053345,-0.027313232,0.000541687,-0.01486969,0.009262085,-0.019439697,0.008514404,0.056427002,-0.06842041,0.023757935,0.014503479,-0.006454468,0.017730713,0.01109314,0.034454346,-0.031021118,-0.01121521,0.0209198,0.019302368,0.049865723,-0.025680542,-0.0046577454,0.022979736,-0.016113281,0.0059890747,-0.015327454,-0.008155823,-0.060424805,-0.008987427,0.006767273,0.014671326,-0.016189575,-0.019439697,0.014389038,0.002248764,0.006866455,0.018508911,-0.01676941,-0.02444458,-0.044281006,0.020965576,0.008911133,-0.015129089,-0.029418945,0.024032593,0.032440186,0.013885498,0.020874023,-0.011978149,-0.00016999245,0.016998291,0.004878998,-0.00844574,0.0385437,0.004627228,0.016921997,0.022262573,-0.0011577606,-0.044433594,-0.024459839,-0.017150879,-0.005996704,0.0079956055,0.00014591217,0.0035762787,-0.0054893494,0.02381897,-0.020233154,-0.022018433,-0.0020771027,-0.027893066,-0.022369385,-0.003622055,-0.016662598,0.023284912,-0.015312195,-0.014373779,0.020889282,-0.00054359436,0.041046143,0.0005993843,-0.011856079,0.023284912,0.040527344,0.020309448,-0.04208374,0.010910034,-0.02029419,-0.012435913,0.008514404,-0.048675537,0.019332886,0.026229858,-0.024887085,0.009727478,0.013648987,0.025634766,0.0049095154,-0.0017786026,0.014129639,0.029785156,-0.0076904297,0.03540039,-0.04486084,0.02848816,0.010887146,0.0045776367,-0.017227173,-0.014404297,-0.027511597,0.02508545,0.023269653,-0.009597778,0.03390503,-0.012481689,0.030929565,-0.014732361,-0.030929565,0.009757996,-0.006843567,-0.007751465,0.012794495,0.0025730133,0.008705139,0.0154418945,-0.018753052,0.024856567,-0.0069236755,0.008987427,-0.0069236755,-0.034851074,-0.0023097992,-0.023452759,0.010040283,-0.021774292,-0.020812988,0.007621765,-0.021759033,0.05770874,0.022521973,0.009796143,0.03253174,0.02243042,0.0054016113,-0.030090332,-0.021774292,0.008079529,0.00007236004,0.02368164,-0.031799316,0.028427124,0.044006348,0.000893116,0.05142212,0.029922485,0.038848877,0.013267517,0.01424408,-0.019485474,-0.012580872,-0.022872925,0.012207031,-0.025390625,0.04168701,-0.020935059,0.0118255615,0.004436493,0.024536133,-0.00944519,0.013328552,0.045440674,0.016418457,-0.0019083023,0.031585693,0.017044067,-0.017532349,-0.007881165,-0.0031776428,0.045654297,0.0050697327,0.03793335,0.045043945,-0.00002270937,-0.0022411346,-0.004272461,-0.029586792,-0.01322937,0.039520264,0.03338623,-0.0032100677,0.0046806335,-0.021270752,-0.014076233,-0.05593872,-0.029937744,0.018661499,0.0022716522,0.00831604,-0.016433716,-0.010719299,-0.011955261,0.027740479,0.010375977,0.004501343,-0.015541077,0.03692627,0.03665161,-0.000019490719,0.019378662,-0.014144897,0.0058784485,-0.026382446,-0.04083252,0.023834229,0.02897644,-0.016174316,-0.009986877,0.011703491,-0.0057868958,0.027023315,0.019134521,-0.02432251,0.0046577454,0.015525818,0.009895325,0.006111145,0.06008911,0.029342651,0.013916016,0.039001465,0.027420044,0.016082764,-0.038848877,0.020309448,-0.0045661926,-0.00007200241,0.012466431,0.014884949,0.026031494,-0.012512207,0.041992188,0.0014305115,-0.019241333,0.014732361,0.0053215027,0.007083893,-0.013626099,0.024215698,0.008056641,-0.021392822,-0.0023403168,0.011817932,-0.008583069,0.023590088,0.03616333,0.03677368,-0.020370483,0.038909912,0.0032081604,-0.0057792664,-0.022018433,0.031951904,-0.05014038,-0.004348755,-0.012252808,0.000087082386,-0.043762207,0.02432251,0.040893555,-0.0013408661,0.001168251,0.00062942505,-0.0076408386,-0.0031528473,0.023925781,0.018875122,0.006778717,-0.0037460327,-0.02949524,0.015579224,0.030960083,-0.006565094,-0.0044174194,-0.012283325,0.014450073,0.0032043457,-0.010238647,-0.010368347,0.010856628,-0.017074585,-0.016281128,0.01058197,0.021392822,0.016220093,0.032684326,-0.010696411,-0.01626587,0.007789612,0.032714844,-0.000009834766,-0.011245728,-0.016571045,0.037139893,-0.029388428,0.05508423,0.042053223,-0.005680084,0.043548584,0.013214111,-0.0077400208,0.0037822723,0.0005788803,0.030700684,-0.010772705,-0.010429382,-0.010688782,0.011383057,-0.021270752,-0.037963867,-0.0029697418,-0.017974854,-0.027572632,-0.0259552,0.0076446533,-0.006427765,0.0138549805,0.04434204,0.034454346,-0.014335632,0.052764893,-0.016082764,0.026626587,-0.010543823,-0.00258255,0.06341553,0.002128601,0.048187256,0.030456543,0.025360107,-0.03805542,0.0044898987,0.00831604,-0.0005264282,0.022949219,0.020217896,-0.02494812,0.03765869,-0.013397217,0.038116455,0.0121154785,0.0040779114,0.009361267,-0.0073547363,-0.0077819824,0.0010929108,-0.0001206398,0.015403748,0.032287598,-0.037109375,0.014663696,-0.03149414,-0.010757446,0.023071289,0.0022525787,0.0037269592,0.0014724731,-0.008415222,0.0073242188,-0.01928711,-0.016799927,0.00894165,0.0072517395,-0.050689697,-0.00059747696,0.018325806,0.027862549,-0.024902344,0.0101623535,0.061798096,0.007144928,-0.008865356,0.031707764,-0.017440796,0.03805542,-0.017410278,0.023956299,0.02053833,0.002626419,-0.019378662,-0.0012702942,0.013694763,-0.010543823,-0.0027866364,0.028457642,0.0037021637,0.014305115,0.022537231,0.023345947,-0.006340027,0.010002136,-0.0020046234,0.010597229,-0.029296875,-0.016799927,0.016052246,0.010696411,0.016845703,0.028030396,0.0039253235,-0.0049438477,0.026824951,0.021987915,0.029525757,-0.046844482,0.009101868,0.026229858,0.0070877075,-0.027816772,-0.0049362183,0.013893127,-0.03668213,0.006576538,0.028625488,-0.0011510849,0.018249512,-0.040161133,-0.004901886,0.030212402,-0.006587982,0.027709961,0.019500732,-0.016067505,0.026794434,-0.01991272,-0.013572693,-0.009239197,-0.0013179779,0.019256592,0.03286743,-0.022949219,-0.03253174,0.03100586,-0.017242432,0.012138367,0.021408081,0.0096588135,0.016998291,-0.01121521,0.02104187,0.0014753342,0.023452759,-0.019241333,-0.009552002,0.009918213,0.028778076,0.031311035,-0.02835083,-0.014015198,0.029449463,0.017105103,0.019042969,0.032806396,0.0041923523,0.032318115,0.02017212,-0.006439209,-0.017486572,0.0011787415,-0.0055122375,-0.011428833,0.02003479,-0.027511597,-0.025222778,0.03942871,0.02166748,-0.012741089,-0.025253296,-0.009437561,-0.009300232,-0.008636475,0.027313232,-0.0019035339,0.032592773,0.0051879883,-0.012001038,0.00579834,-0.033203125,-0.043304443,-0.0023975372,-0.0040779114,-0.0017166138,-0.055786133,-0.0019311905,-0.010635376,0.03112793,-0.03100586,-0.008308411,0.0038166046,0.006324768,0.00007587671,-0.016845703,-0.0006132126,0.016067505,-0.00041532516,0.005710602,0.030807495,-0.009796143,-0.02734375,-0.030441284,0.02458191,-0.019302368,0.040405273,0.0010538101,0.029067993,0.017196655,0.0049743652,0.0005874634,-0.006477356,-0.011390686,-0.0002439022,-0.017684937,-0.05532837,0.031051636,0.026153564,-0.010726929,-0.011955261,0.030044556,-0.018539429,-0.013511658,0.035217285,0.037261963,0.014709473,0.011695862,-0.0012302399,0.0010261536,-0.012069702,0.0052871704,-0.021453857,0.0015649796,-0.0038223267,-0.0030441284,0.010917664,0.013908386,0.02029419,-0.018371582,-0.021896362,0.02255249,0.023925781,0.014602661,0.017242432,0.012321472,-0.0065574646,-0.011154175,-0.027023315,-0.0035686493,0.025009155,0.001783371,0.034301758,0.023330688,-0.0053138733,-0.013832092,0.026153564,0.00422287,-0.018188477,-0.042510986,-0.010047913,-0.053497314,0.035491943,-0.013015747,-0.00053071976,-0.0015869141,0.014266968,-0.021026611,-0.04800415,-0.0099105835,0.024963379,0.015350342,0.005508423,-0.023010254,0.0005722046,0.0072135925,-0.04019165,-0.002576828,-0.045318604,-0.033935547,-0.0028934479,-0.00415802,0.014572144,0.0013132095,0.0021362305,0.004875183,-0.0032100677,-0.0042304993,-0.020233154,0.022567749,-0.010658264,-0.007293701,0.01939392,0.036224365,-0.023971558,0.0035972595,-0.026229858,0.0048713684,0.03375244,-0.0023155212,0.028656006,-0.03237915,0.020187378,-0.003528595,-0.0020332336,0.014572144,0.0009627342,0.013374329,-0.021026611,0.0025043488,0.009651184,-0.0056610107,0.03161621,-0.034820557,-0.03665161,0.010055542,-0.015609741,-0.021942139,-0.0013980865,0.0026893616,0.0032081604,-0.024002075,0.03656006,-0.026672363,-0.01828003,0.02607727,-0.0021419525,-0.015838623,0.011138916,0.025543213,0.0037078857,-0.005279541,0.0010032654,-0.014892578,-0.036712646,-0.006538391,0.0014591217,-0.018569946,0.0053634644,0.025299072,0.0038528442,0.05984497,0.01108551,0.01826477,0.020858765,0.017227173,0.022216797,0.009780884,0.03869629,-0.012870789,-0.02330017,-0.0035877228,0.0032520294,-0.0209198,0.016830444,-0.009063721,-0.03050232,-0.020019531,0.01826477,0.00008660555,0.025512695,0.016418457,0.002319336,-0.026016235,0.005508423,-0.031982422,-0.0209198,-0.021972656,0.025787354,0.046905518,0.0038223267,0.011367798,-0.010017395,-0.0082092285,0.034057617,0.041625977,-0.0058250427,-0.052856445,-0.02848816,0.038482666,-0.0016069412,0.013587952,0.009643555,-0.009719849,0.0154800415,-0.0035266876,-0.01550293,0.006942749,-0.01689148,0.013092041,0.0045318604,0.006916046,-0.013671875,0.038208008,-0.018844604,-0.0146865845,-0.001531601,-0.0034980774,0.035125732,0.031082153,-0.0028362274,0.008644104,0.004852295,-0.02406311,0.0440979,-0.011917114,-0.004962921,0.008712769,0.0058403015,-0.028747559,-0.022949219,-0.0046310425,-0.00021398067],"createdAt":"2026-04-21T18:32:27.565Z","updatedAt":"2026-04-22T21:32:16.288Z","lastSeenAt":"2026-04-22T21:32:16.288Z","tsv":"'/api':187 '/pricing':188 '/readme':190 '/request':16,32,158 '0.02':15,31,80,157 '000':86 '0x8335':67 '100':52 '20':85 '2913':68 '402 payment NFT' '6':90 'Base USDC API' 'NFT metadata API' 'advertis':77 'ai/ml':129 'analysi':132 'analyt':128 'api':93,125 'application/json':221 'attach':102 'base':5,21,62,87,165 'base-network' 'beyond':177 'broader':118 'call':9,25,124 'caller':100,214 'case':49 'challeng':180 'classif':134 'connect':198 'content':203 'contract':66 'convers':150 'crawl':186 'data':127 'decim':91 'discov':226 'document':166 'embed':135 'enabl':36 'endpoint':3,19,37,153 'estim':144 'exact':73,228 'exact-pay':72 'exchang':139 'expect':216 'experiment':230 'feed':138 'finance/web3':136 'gas':143 'generat':151 'geocod':148 'given':45 'header':107 'host':116 'id':51 'infer':130 'infrastructur':146 'json':218 'json-response' 'key':94 'limit':97 'lowpaymentfee' 'lowpaymentfee.com':39 'maxamountrequir':83 'metadata':2,18,42,210 'mimetyp':220 'minim':168 'model':163 'need':224 'network':63 'nft':1,17,41,209 'nft-metadata' 'no-api-key' 'openapi':172 'outputschema':182 'page':191 'pay':7,23,122 'pay-per-cal':6,22,121 'pay-per-call' 'pay-per-request NFT' 'payment':57,74,106,112,162 'per':8,24,81,123 'post':55 'price':78,137,159 'prompt':199 'proof':113 'provid':115 'quot':142 'rate':96,140 'request':56,82 'request/response':175 'requir':99 'resolv':193 'respons':211,219 'schema':176,229 'scheme':75 'sentiment':131 'serv':40 'settl':59 'share':154 'simpli':101 'span':126 'spec':173 'specif':205 'structur':206 'stub':183 'suit':119 'summar':133 'token':46,50,141 'token metadata' 'unit':88 'unknown':213 'usdc':13,29,65 'usdc-settlement' 'use':64 'util':147 'valid':110,149 'via':10,26,53 'wallet':197 'wallet-connect':196 'x':105 'x-payment':104 'x402':11,27,35,71,111,161,179 'x402 NFT endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6f9f8d81-8204-43d4-9814-02c7ce20562d","listingId":"c732dfe2-6bd3-4e0f-acd2-15821fa442a7","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/100/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":"2026-04-21T18:32:27.565Z"}],"sources":[{"listingId":"c732dfe2-6bd3-4e0f-acd2-15821fa442a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/100/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.565Z","lastSeenAt":"2026-04-22T21:32:16.288Z"}],"details":{"listingId":"c732dfe2-6bd3-4e0f-acd2-15821fa442a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/100/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/nfts/100/metadata"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/100/metadata"}],"useCases":["Retrieving on-chain NFT metadata without managing API keys","Programmatic access to NFT token details for marketplace or portfolio apps","Agent-driven NFT data lookups with instant micropayment settlement"],"bestFor":["Developers wanting keyless, pay-as-you-go NFT metadata access","AI agents that can settle x402 payments on Base","Projects needing low-cost per-call NFT data without subscriptions"],"notFor":["High-volume bulk NFT metadata scraping (no documented batch endpoint)","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.194Z"},"updatedAt":"2026-04-22T21:32:16.288Z"}}