{"id":"c1aa6e9a-b6b6-4167-80eb-3407313f9755","shortId":"Du9Qpu","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to NFT data via the x402 payment protocol. The specific resource `/api/v1/nfts/2` is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform advertises a uniform $0.02 per-request price across all its endpoints. Documentation beyond the landing page is sparse: the /api, /pricing, and /README routes all resolve to a minimal \"Connect wallet\" page with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact data returned by the `/api/v1/nfts/2` endpoint (e.g., NFT metadata, ownership info, or collection data) is not documented and must be inferred from the path.","tags":[],"capabilities":["x402-payment","usdc-base","nft-data","pay-per-request","no-api-key","json-response"],"categories":["web3","nft","data"],"synonyms":["NFT API","NFT metadata","x402 NFT endpoint","Base USDC API","pay-per-call NFT","lowpaymentfee","crypto API","NFT data feed"],"warnings":["No request or response schema documented — callers must discover behavior empirically","The /api, /pricing, and /README pages contain no useful documentation","The specific data returned by /api/v1/nfts/2 is not described anywhere in available materials","No OpenAPI or ai-plugin manifest available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the /api, /pricing, and /README pages are all empty beyond a wallet connect prompt. The actual data returned is 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":"2026-04-21T23:20:45.485Z","embedding":[-0.030822754,-0.014694214,0.055023193,0.0025806427,0.031463623,-0.028335571,-0.013389587,0.014427185,0.04812622,-0.062805176,0.030792236,-0.016952515,-0.058135986,-0.05203247,-0.03314209,0.0036067963,-0.02142334,-0.01499939,-0.042938232,0.030700684,0.044677734,-0.00730896,-0.018997192,0.020721436,-0.012275696,-0.0009498596,0.0022392273,0.0011148453,-0.0077552795,-0.025924683,0.015319824,-0.02229309,-0.0021095276,0.00434494,-0.012245178,-0.0041275024,0.00013971329,0.023223877,0.019042969,-0.0158844,-0.0027542114,-0.048431396,0.010192871,-0.004333496,-0.030273438,-0.023117065,0.002811432,-0.040893555,-0.010627747,0.014076233,-0.026168823,-0.027053833,-0.023834229,0.014709473,0.00843811,0.033294678,-0.0007390976,-0.013977051,0.0069274902,0.016174316,-0.006187439,-0.06591797,0.00598526,-0.0048942566,0.0110321045,0.046783447,-0.016296387,0.042175293,-0.0000064373016,0.089660645,0.024642944,0.053497314,0.029785156,0.014030457,0.013954163,-0.019515991,-0.009536743,0.056854248,-0.016952515,-0.03475952,-0.021575928,-0.0050315857,-0.054901123,-0.012840271,-0.014419556,-0.05886841,-0.009307861,0.016479492,-0.031982422,0.04144287,-0.088256836,-0.009292603,-0.013786316,0.022720337,-0.016937256,-0.0048103333,-0.011650085,-0.0025634766,0.0073661804,0.0038757324,-0.011413574,-0.019561768,0.016662598,0.008766174,0.049224854,0.052947998,0.016799927,0.005180359,-0.0011940002,-0.011894226,-0.022750854,0.021438599,-0.0055732727,-0.014656067,0.008415222,0.004219055,-0.041168213,0.04067993,-0.0034217834,0.032440186,-0.047607422,0.053863525,0.017333984,0.010917664,0.001033783,-0.032226562,-0.030670166,0.01335144,-0.00116539,-0.008605957,0.03878784,-0.00039553642,0.025772095,-0.016281128,-0.037384033,0.009262085,-0.030944824,-0.029266357,-0.053497314,-0.002878189,0.03274536,-0.036956787,0.013877869,0.023452759,-0.10064697,0.009796143,-0.035186768,0.028381348,-0.030166626,0.0033779144,0.007259369,0.025787354,-0.0026721954,-0.024246216,-0.014282227,-0.028808594,0.0020599365,0.014289856,-0.005958557,0.052337646,-0.019073486,0.031707764,0.037261963,0.009223938,0.027374268,0.04373169,-0.017410278,-0.09033203,-0.074645996,-0.006462097,-0.00022268295,-0.018707275,-0.016647339,-0.004573822,-0.002855301,-0.07366943,-0.02218628,-0.0045814514,0.014808655,-0.029922485,-0.011932373,-0.06402588,0.0019836426,0.002199173,-0.047973633,-0.009498596,-0.039093018,0.061553955,0.0102005005,0.020507812,0.022079468,0.0019893646,0.04156494,0.03640747,-0.022994995,-0.028656006,0.014808655,-0.02670288,0.03881836,0.0033302307,0.03201294,-0.011932373,0.03451538,0.06573486,0.0033054352,-0.01576233,0.000092327595,-0.066345215,-0.026275635,-0.01864624,0.010444641,0.01725769,-0.034606934,0.013374329,-0.032440186,-0.02619934,-0.0025787354,0.009963989,0.014892578,0.06762695,0.0030536652,0.0060539246,0.021652222,0.025024414,-0.04244995,0.036132812,0.020721436,-0.0029392242,-0.0063285828,-0.034851074,0.020935059,0.032470703,-0.014572144,0.009063721,-0.03967285,0.008682251,-0.025436401,-0.016967773,0.016647339,0.003921509,-0.028930664,-0.05621338,-0.010154724,0.03353882,-0.0075912476,-0.03363037,-0.04815674,-0.074523926,0.047027588,0.049713135,0.026245117,0.012573242,-0.0025997162,-0.035339355,0.00089883804,-0.0803833,0.05404663,0.07861328,-0.007835388,-0.011650085,0.032806396,-0.011894226,-0.0357666,-0.021224976,-0.011917114,-0.03262329,-0.01751709,0.0116119385,-0.04562378,0.016921997,0.021987915,0.020385742,0.043395996,-0.030288696,-0.061645508,0.0027866364,-0.008529663,-0.00035262108,-0.025863647,-0.024368286,0.008850098,0.012382507,0.040100098,0.0124053955,0.009757996,-0.014640808,0.0088272095,0.0023612976,0.0075416565,-0.0138168335,-0.013160706,0.020523071,-0.006752014,-0.04574585,0.009689331,-0.004573822,0.059173584,-0.05606079,0.035461426,-0.020065308,-0.007320404,0.035369873,-0.004386902,-0.04724121,-0.011436462,0.008728027,0.037231445,0.052886963,0.012496948,-0.0116119385,-0.008506775,0.06854248,-0.02973938,-0.008041382,0.0019388199,0.047851562,0.040283203,0.013175964,-0.057373047,-0.035736084,-0.0058670044,-0.048431396,0.03857422,-0.02458191,0.021743774,-0.00566864,0.01133728,-0.020324707,-0.0038833618,-0.018798828,0.021026611,-0.015174866,0.007873535,-0.017730713,-0.00944519,0.011047363,0.026275635,-0.01802063,0.0029830933,0.03173828,0.034576416,-0.024765015,-0.03086853,-0.025558472,-0.029693604,0.00248909,-0.0004911423,0.036315918,0.005077362,0.04071045,-0.036956787,0.0043640137,0.020706177,0.012649536,0.04534912,0.0065231323,-0.004348755,-0.0670166,-0.046875,-0.023101807,-0.04083252,0.034240723,0.035339355,0.0067367554,0.04168701,-0.0030727386,-0.020843506,-0.03363037,0.034851074,-0.06149292,0.00090646744,0.044677734,-0.01991272,-0.02293396,0.033081055,0.015625,0.0335083,0.038360596,0.023895264,0.004722595,0.06945801,0.02458191,0.009101868,-0.004962921,0.026824951,0.03616333,0.000055611134,-0.015357971,-0.029159546,-0.02709961,0.03515625,-0.03074646,-0.034179688,-0.06088257,0.05444336,0.034179688,0.09039307,0.021087646,0.0021953583,0.044403076,-0.008583069,0.007659912,-0.020568848,-0.02810669,-0.05114746,-0.02923584,0.022216797,0.007724762,0.0048980713,-0.031280518,0.016815186,0.018707275,0.015991211,-0.020019531,0.051361084,-0.0014238358,-0.0059318542,0.010696411,-0.0073928833,0.037322998,0.059020996,-0.036590576,0.036193848,0.0050811768,-0.050689697,-0.011650085,0.009788513,-0.0022602081,-0.022857666,-0.05630493,-0.032470703,-0.0021457672,-0.012870789,-0.047821045,-0.0029792786,0.0090408325,0.03817749,0.036224365,-0.011459351,-0.013900757,0.008003235,-0.0042419434,-0.053894043,-0.0064353943,-0.057617188,-0.0005464554,0.028961182,-0.012794495,-0.00017380714,-0.0042381287,0.008613586,0.008514404,0.025848389,0.0074272156,0.001914978,-0.039855957,0.008552551,-0.006340027,0.02368164,0.012306213,0.024795532,0.027404785,0.027359009,0.029693604,0.017349243,-0.024169922,-0.05303955,0.03491211,-0.034606934,-0.0010318756,0.024978638,-0.022445679,0.007911682,-0.009597778,-0.019073486,-0.020065308,0.010032654,-0.029571533,0.007221222,0.0385437,-0.03656006,-0.024047852,-0.0637207,-0.033966064,0.008010864,0.066833496,0.04598999,0.015533447,-0.034942627,-0.023651123,0.029663086,-0.0032958984,0.031829834,-0.0135650635,-0.019760132,-0.017654419,-0.0423584,-0.01197052,-0.018936157,0.02520752,-0.012260437,-0.0072402954,0.031051636,0.009559631,0.014770508,0.0014362335,-0.011001587,0.01876831,-0.03375244,0.025146484,0.0070343018,0.04611206,0.0055770874,-0.005622864,-0.032989502,0.042144775,-0.00092697144,0.041137695,-0.050872803,-0.0051879883,-0.006389618,0.02458191,0.01184082,-0.02619934,0.0027217865,-0.0027332306,-0.03527832,-0.08148193,0.04336548,-0.010627747,0.032592773,0.014076233,0.0041275024,0.035339355,-0.010574341,-0.0024662018,0.025543213,-0.028503418,-0.019378662,-0.034484863,-0.03463745,-0.025863647,-0.0044441223,-0.017242432,0.019805908,-0.008033752,0.012138367,-0.0036354065,-0.03289795,0.017303467,0.0090789795,-0.009681702,0.031799316,0.008293152,0.021362305,0.05908203,0.017120361,-0.03616333,0.026000977,0.0065193176,0.0056991577,-0.012481689,0.044799805,0.041870117,0.006969452,-0.0051574707,-0.01109314,0.0008869171,-0.025131226,-0.017242432,0.009147644,0.01838684,0.008285522,-0.03692627,-0.00017488003,0.022445679,-0.03503418,-0.015701294,0.009864807,0.020126343,-0.036224365,0.015838623,0.018600464,0.04135132,-0.030517578,0.00818634,0.009971619,0.038482666,0.0206604,-0.00041127205,-0.0030059814,0.013679504,-0.011001587,0.0039138794,0.015464783,-0.018310547,0.015022278,0.01007843,0.020446777,0.022918701,0.009681702,-0.015007019,-0.03488159,0.011932373,-0.0058135986,-0.025054932,0.041870117,0.013893127,0.020645142,-0.0038280487,0.021987915,0.014678955,-0.011291504,-0.017822266,0.0010051727,0.032104492,-0.0116119385,-0.0012054443,0.0070648193,0.018722534,0.021957397,-0.060638428,-0.010070801,0.010444641,0.024261475,-0.02494812,-0.0390625,-0.029571533,-0.032562256,0.021255493,0.0031757355,0.00070524216,0.03665161,0.0014982224,-0.013000488,0.007911682,0.0066184998,-0.008644104,-0.019363403,-0.045013428,-0.025024414,-0.011878967,0.002506256,-0.02293396,0.00844574,-0.026245117,-0.029067993,-0.00021195412,-0.032440186,-0.005126953,-0.0073394775,0.004940033,0.024658203,-0.01550293,0.024307251,-0.026748657,-0.038208008,-0.0004968643,-0.0018968582,0.033294678,-0.041748047,0.021759033,-0.0099105835,0.009399414,-0.0051498413,0.00705719,0.016555786,0.038360596,0.00957489,0.030212402,-0.029510498,0.03616333,-0.03567505,0.018341064,-0.0020332336,-0.037384033,-0.007648468,-0.030090332,-0.012229919,0.045684814,-0.02218628,-0.0050964355,-0.021697998,-0.044647217,-0.01272583,-0.052734375,0.007461548,0.026473999,0.03878784,-0.03074646,0.007019043,0.0129852295,0.01676941,-0.01285553,0.004840851,-0.022033691,0.015289307,0.014854431,0.0012245178,-0.025436401,-0.024215698,-0.0051956177,-0.0027503967,-0.054351807,-0.03668213,-0.012634277,-0.0066871643,-0.008178711,0.0027923584,-0.025314331,-0.03793335,0.008995056,-0.023971558,0.022964478,-0.0044174194,0.014793396,0.018798828,-0.018722534,0.0118255615,0.024520874,-0.015602112,0.032043457,0.027709961,-0.010681152,-0.036315918,-0.0001937151,0.021331787,0.010421753,-0.009117126,-0.017440796,-0.006713867,-0.030288696,-0.06756592,0.0016431808,-0.010726929,-0.0041046143,0.0068130493,-0.007522583,-0.041259766,0.00093746185,-0.024932861,0.008552551,0.015274048,0.009925842,0.01586914,-0.009223938,0.005680084,-0.022033691,-0.0082092285,-0.030471802,0.007659912,0.009315491,-0.0026779175,0.027130127,0.038879395,-0.0071144104,-0.014289856,-0.008338928,-0.0036964417,0.01071167,-0.018615723,-0.005264282,-0.01309967,0.015174866,0.00019550323,-0.00868988,-0.037200928,0.007160187,0.055511475,-0.0068206787,-0.011329651,-0.0007724762,-0.0042648315,0.016082764,0.038848877,-0.038909912,-0.009284973,-0.030700684,0.033233643,-0.023040771,0.014152527,-0.008132935,0.03894043,-0.009140015,-0.0446167,-0.0064086914,-0.004234314,-0.0040283203,-0.062683105,-0.026519775,-0.059143066,0.014671326,-0.021133423,-0.032318115,0.0005226135,0.027175903,-0.024261475,-0.07598877,-0.010383606,0.05883789,0.0069007874,0.025650024,-0.003643036,0.03475952,0.029937744,-0.018554688,-0.00022411346,0.014732361,-0.019607544,-0.0039634705,-0.024093628,0.034088135,0.0015077591,-0.01802063,0.027145386,0.0021438599,0.023620605,-0.012496948,0.034973145,-0.013008118,-0.004627228,-0.005680084,0.019317627,-0.015808105,-0.010871887,0.043182373,-0.042419434,0.027053833,0.013175964,0.0073394775,0.002105713,0.020751953,0.03918457,-0.04559326,-0.006839752,0.038604736,0.02268982,0.050933838,-0.028930664,0.019058228,0.014930725,-0.007751465,0.006072998,-0.024902344,-0.019348145,-0.0395813,-0.025939941,0.025146484,0.00013828278,-0.00598526,-0.010177612,0.01675415,0.010528564,0.0118637085,0.00081920624,-0.025619507,-0.023757935,-0.04144287,0.023361206,0.007396698,0.0033435822,0.003993988,0.022766113,0.041503906,0.029785156,0.0046539307,-0.02041626,0.005882263,0.021011353,-0.0066566467,-0.011558533,0.030166626,0.009628296,0.031433105,0.028060913,0.016159058,-0.04800415,-0.03765869,-0.011146545,-0.014427185,0.01689148,0.0031318665,0.001540184,0.016662598,0.007801056,-0.0127334595,-0.027328491,0.010688782,-0.027282715,-0.024612427,0.0045394897,-0.012321472,0.021087646,0.008277893,-0.014228821,0.01725769,-0.010040283,0.04373169,-0.0014076233,-0.018051147,0.028762817,0.027008057,0.010139465,-0.027648926,-0.011405945,-0.030166626,-0.03112793,0.010002136,-0.014518738,0.019256592,0.036193848,-0.0088272095,0.0082473755,0.007801056,0.028137207,0.005607605,0.013755798,0.005695343,0.021087646,-0.014152527,0.042510986,-0.052734375,0.015258789,0.01902771,0.016098022,-0.011680603,0.0037174225,-0.031829834,0.027572632,0.013214111,-0.0046920776,0.0413208,-0.014755249,0.026901245,-0.021484375,-0.024215698,0.008293152,-0.016296387,-0.020080566,0.01007843,-0.006877899,0.013046265,0.023757935,-0.021728516,0.020004272,-0.004016876,0.0035762787,0.0026016235,-0.008178711,-0.021224976,-0.024978638,0.007106781,-0.02973938,-0.035461426,0.005634308,-0.013389587,0.056152344,0.032928467,-0.00035738945,0.028411865,0.011131287,0.02407837,-0.03488159,-0.039031982,0.009841919,-0.016036987,0.023803711,-0.021942139,0.051696777,0.04827881,0.018447876,0.048431396,0.011711121,0.02973938,0.013435364,0.0057868958,-0.020050049,0.01914978,-0.037017822,0.016143799,-0.008865356,0.048980713,-0.03225708,0.004245758,-0.001200676,0.036499023,-0.019348145,0.009017944,0.050720215,0.03616333,-0.0054130554,0.044158936,0.010108948,-0.022628784,-0.019866943,-0.012634277,0.05529785,0.0138549805,0.035736084,0.03262329,0.0033493042,0.0048179626,0.013336182,-0.038208008,-0.028060913,0.04815674,0.039611816,-0.012496948,-0.007801056,-0.012374878,-0.010643005,-0.054107666,-0.02456665,0.013549805,0.0033397675,0.023864746,-0.006298065,-0.0027103424,-0.015182495,0.02015686,0.004611969,0.0034999847,-0.015258789,0.022369385,0.030212402,0.00023317337,0.033050537,-0.0046081543,0.029510498,-0.01701355,-0.019760132,0.024368286,0.025665283,-0.0065727234,-0.0019950867,0.025177002,0.0050735474,0.032318115,0.018295288,-0.024353027,-0.015808105,0.01687622,0.018218994,-0.0038928986,0.05126953,0.037628174,0.024795532,0.044128418,0.033111572,0.0209198,-0.031585693,0.012908936,0.0007791519,-0.004272461,0.0036773682,0.00090408325,0.022888184,-0.013427734,0.03050232,0.0017232895,-0.016830444,0.029083252,0.022720337,0.00044107437,-0.00944519,0.012435913,0.012161255,-0.025634766,0.0055351257,0.007232666,-0.011558533,0.026641846,0.018203735,0.03930664,-0.019058228,0.04321289,0.013435364,-0.017684937,-0.019104004,0.009513855,-0.037200928,-0.00655365,-0.007549286,-0.005580902,-0.044891357,0.017028809,0.03793335,-0.010765076,0.007751465,0.0012540817,-0.012748718,0.0012712479,0.029083252,0.022018433,-0.016021729,-0.008712769,-0.024475098,0.029342651,0.037017822,-0.0012779236,-0.008277893,-0.027954102,0.009796143,0.017089844,-0.009544373,-0.0046463013,-0.0040283203,0.0048980713,-0.03616333,0.013969421,0.023956299,0.019866943,0.04425049,-0.010498047,-0.02885437,-0.00022983551,0.033172607,0.011764526,-0.0069122314,-0.016952515,0.019577026,-0.027999878,0.03781128,0.037384033,-0.00920105,0.030090332,-0.00365448,-0.011383057,0.0016069412,-0.009155273,0.026977539,-0.021392822,-0.0028133392,-0.014694214,0.014533997,-0.013000488,-0.037506104,-0.005458832,-0.017471313,-0.025894165,-0.022109985,0.023498535,-0.00073337555,0.015563965,0.043304443,0.023345947,-0.021575928,0.05871582,-0.0051078796,0.028213501,-0.0135269165,-0.0029697418,0.06719971,0.01737976,0.050445557,0.025848389,0.016494751,-0.028579712,0.0038146973,0.022216797,0.01675415,0.026245117,0.004211426,-0.022857666,0.040649414,-0.013938904,0.02432251,0.0017251968,0.0038394928,0.014030457,-0.010192871,-0.011039734,-0.0038089752,-0.0063705444,0.017852783,0.052642822,-0.034057617,-0.0021457672,-0.014328003,-0.022567749,0.028717041,0.004699707,0.0021324158,0.0096588135,-0.029159546,0.004676819,-0.017868042,-0.021148682,0.0040397644,0.025665283,-0.04626465,-0.0020713806,0.0074043274,0.03074646,-0.023666382,0.035736084,0.050323486,0.014152527,0.0137786865,0.037109375,-0.012084961,0.040649414,-0.0076675415,0.02659607,0.0262146,0.0031738281,-0.012969971,0.012077332,0.0028209686,-0.011634827,0.00034284592,0.02520752,0.0071792603,0.011619568,0.008415222,0.020492554,-0.010650635,0.01449585,-0.014823914,0.0024204254,-0.015823364,-0.010681152,0.008331299,0.0049095154,0.007549286,0.0056152344,0.0017690659,-0.007801056,0.020935059,0.033172607,0.020584106,-0.04006958,-0.0041999817,0.0129470825,0.023101807,-0.016983032,-0.006931305,0.0013532639,-0.041656494,0.011100769,0.017150879,-0.0035629272,0.017562866,-0.03286743,-0.012046814,0.037994385,0.0044517517,0.025009155,0.027145386,-0.020263672,0.016403198,-0.0033302307,-0.008544922,-0.008041382,-0.008407593,0.02470398,0.01625061,-0.015083313,-0.031051636,0.020141602,-0.012924194,0.007820129,0.017196655,-0.009048462,0.024505615,-0.01209259,0.011390686,0.009155273,0.002565384,-0.018829346,-0.018371582,-0.009681702,0.021514893,0.04434204,-0.016647339,-0.014984131,0.02609253,0.027679443,0.0062561035,0.033172607,0.011932373,0.031341553,0.022506714,-0.016159058,-0.022781372,0.025115967,-0.01133728,-0.025924683,0.016723633,-0.02418518,-0.029586792,0.031677246,0.007423401,-0.0054359436,-0.035461426,0.0006656647,-0.019805908,-0.015625,0.030822754,0.00054740906,0.017150879,-0.011802673,-0.0026817322,0.020980835,-0.03616333,-0.03289795,-0.0039405823,0.002527237,-0.008529663,-0.051727295,0.006340027,-0.016159058,0.015640259,-0.021652222,-0.0060043335,-0.016021729,0.028686523,-0.00049448013,-0.011955261,0.0068511963,0.02142334,0.0066490173,0.014541626,0.028152466,-0.022506714,-0.023468018,-0.018875122,0.028930664,-0.017501831,0.029510498,-0.012496948,0.032592773,0.017364502,-0.015686035,0.0040016174,-0.010749817,-0.022018433,-0.0059127808,-0.028762817,-0.037841797,0.013214111,0.025817871,-0.009796143,-0.005680084,0.046081543,-0.023788452,-0.015655518,0.030288696,0.03552246,0.007095337,0.025009155,-0.003572464,-0.0059509277,-0.020950317,0.009689331,-0.016525269,0.011039734,-0.005344391,0.0038433075,0.004055023,0.017501831,0.014533997,-0.004371643,-0.01083374,0.021530151,0.027862549,0.0069084167,0.043426514,0.018630981,-0.008285522,-0.019851685,-0.017333984,0.016189575,0.036590576,0.019439697,0.012771606,0.0030403137,0.006958008,-0.010261536,0.022537231,0.016189575,-0.0107803345,-0.04260254,-0.019073486,-0.038726807,0.021270752,-0.0075416565,0.01525116,-0.013473511,0.019866943,0.0011978149,-0.044006348,-0.02178955,0.040374756,0.011100769,-0.010749817,-0.019805908,-0.00434494,0.0017547607,-0.03491211,0.0000692606,-0.052886963,-0.02545166,-0.010055542,-0.006111145,0.0129852295,-0.00092697144,-0.0007958412,0.002500534,-0.0070724487,-0.0029392242,-0.001581192,0.01953125,-0.020553589,-0.0043182373,0.013374329,0.019851685,-0.019256592,0.013023376,-0.011352539,0.0012645721,0.022155762,-0.017410278,0.023223877,-0.017715454,0.022384644,0.005882263,-0.011779785,0.018844604,-0.0017271042,0.017730713,-0.018600464,0.007801056,-0.010543823,0.009941101,0.032073975,-0.014595032,-0.037231445,0.008934021,-0.0077667236,-0.019836426,0.00003951788,0.0062942505,0.031143188,-0.013511658,0.04449463,-0.008628845,-0.006767273,0.008903503,0.0047721863,-0.02229309,0.003643036,0.017410278,0.004470825,0.0005764961,-0.00019907951,-0.011398315,-0.046020508,-0.01651001,0.0045204163,-0.01637268,0.0048332214,0.018829346,0.014945984,0.05279541,-0.00182724,0.023345947,0.02293396,0.020507812,0.027023315,0.009239197,0.035614014,0.0037231445,-0.020751953,-0.0035820007,0.00039625168,-0.016296387,0.012321472,-0.0031490326,-0.012397766,-0.029708862,0.011398315,0.003944397,0.032714844,0.0013446808,0.007091522,-0.020767212,-0.0014181137,-0.038024902,0.00065231323,-0.031829834,0.019363403,0.037506104,0.011398315,0.0009703636,-0.0045204163,-0.018661499,0.039520264,0.04711914,-0.0049209595,-0.038848877,-0.02293396,0.018981934,-0.0020866394,-0.0023403168,0.009567261,-0.026855469,-0.0035266876,0.00073575974,-0.009895325,0.010383606,-0.011253357,0.0069847107,0.006378174,-0.0070343018,-0.0025997162,0.02571106,-0.013801575,-0.012908936,0.0044517517,0.0045051575,0.039520264,0.040802002,-0.009880066,0.010818481,0.026428223,-0.03640747,0.04336548,-0.01701355,-0.0068206787,-0.007511139,0.019180298,-0.042175293,-0.0104904175,-0.010894775,0.00642395],"createdAt":"2026-04-21T18:32:27.686Z","updatedAt":"2026-04-22T02:32:08.848Z","lastSeenAt":"2026-04-22T02:32:08.848Z","tsv":"'/api':170 '/api/v1/nfts/2':48,208 '/pricing':171 '/readme':173 '0.02':10,24,122,153 '000':113 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20':112 '6':118 'Base USDC API' 'NFT API' 'NFT data feed' 'NFT metadata' 'accept':83 'access':36 'across':158 'advertis':150 'ai':73 'amount':107 'analyt':72 'api':35,69,125 'attach':136 'avail':201 'base':8,22,94,114 'beyond':163 'broad':62 'call':68,110 'caller':134 'catalog':63 'collect':216 'commit':131 'connect':180 'contract':98 'crypto API' 'data':5,19,39,71,204,217 'decim':119 'detail':187 'document':162,196,220 'e.g':210 'endpoint':6,20,30,53,82,161,209 'equal':121 'exact':103,203 'exampl':199 'financ':76 'gate':3,17 'header':141 'host':60 'infer':224 'info':214 'infrastructur':79 'json':88 'json-response' 'key':126 'land':165 'learn':75 'limit':128 'lowpaymentfee' 'lowpaymentfee.com':32,57 'machin':74 'mani':52 'maximum':106 'metadata':212 'minim':179 'must':222 'network':95 'nft':4,18,38,211 'nft-data' 'no-api-key' 'offer':54 'one':50 'openapi':191 'ownership':213 'page':166,182 'path':227 'pay':9,23,66 'pay-per-cal':65 'pay-per-call NFT' 'pay-per-request' 'payload':200 'payment':43,89,140,146 'per':11,25,67,109,155 'per-request':154 'platform':58,149 'post':84 'premium':34 'price':157 'proof':147 'protocol':44 'provid':33 'rate':127 'request':12,26,85,156 'request/response':194 'requir':108,133 'resolv':176 'resourc':47 'return':87,205 'rout':174 'schema':195 'scheme':104 'settl':91 'simpli':135 'span':70 'spars':168 'spec':192 'specif':46 'technic':186 'uniform':152 'unit':115 'upfront':130 'usd':123 'usdc':14,28,97,117 'usdc-base' 'use':96 'util':80 'valid':144 'via':40,100 'wallet':181 'web3':77 'x':139 'x-payment':138 'x402':2,16,42,102,145 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7072c8c2-cf71-47ee-9de1-48cc2e53f624","listingId":"c1aa6e9a-b6b6-4167-80eb-3407313f9755","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.686Z"}],"sources":[{"listingId":"c1aa6e9a-b6b6-4167-80eb-3407313f9755","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.686Z","lastSeenAt":"2026-04-22T02:32:08.848Z"}],"details":{"listingId":"c1aa6e9a-b6b6-4167-80eb-3407313f9755","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/2 \\\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 requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/2"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/2"}],"useCases":["Fetching NFT metadata or details programmatically with per-call USDC payment","Integrating NFT data into agent workflows without managing API keys","Exploring x402 payment protocol for micropayment-gated API access"],"bestFor":["Developers experimenting with x402 micropayment APIs","Agents needing keyless, pay-per-call NFT data on Base","Prototyping crypto-native API consumption patterns"],"notFor":["Production workloads requiring documented request/response schemas","High-volume NFT data needs where bulk pricing is preferred","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.952Z"},"updatedAt":"2026-04-22T02:32:08.848Z"}}