{"id":"77b5e031-9021-40d0-bb16-0754ccdacc47","shortId":"jExC7V","kind":"x402","title":"x402-gated card-transaction endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated card-transaction endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/41/transactions` behind an x402 paywall. It accepts POST requests and settles payments in USDC on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform lists numerous additional endpoints across data/analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/cards/41/transactions` endpoint.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the \"cards/41/transactions\" resource actually returns or what POST body it expects. The endpoint is live (returns a well-formed 402 challenge), but its actual functionality and data model remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 payment endpoint","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call API","card data endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only a wallet-connect prompt with no content","No OpenAPI or request/response schema provided; the POST body format and response structure are completely unknown","The purpose of 'cards/41/transactions' is unclear — it could be financial card data, gift cards, or something else entirely","The broader site lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/41/transactions","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/cards/41/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'cards/41/transactions' actually does. The listing is effectively a stub with only pricing and network information available.","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":"2026-04-19T02:53:04.766Z","embedding":[-0.04156494,-0.026382446,0.04196167,0.0023040771,0.017715454,-0.026473999,-0.027633667,0.02507019,0.08239746,-0.057281494,0.038238525,-0.058258057,-0.06311035,-0.015586853,-0.027633667,0.0025348663,-0.010444641,0.024734497,-0.018539429,0.03375244,0.049835205,-0.03652954,-0.009162903,0.011795044,-0.023391724,-0.0022583008,-0.009933472,-0.011116028,-0.023010254,-0.033081055,0.05783081,-0.01927185,-0.019256592,-0.0104904175,-0.0052986145,0.019638062,-0.0030822754,0.029891968,0.050079346,-0.026382446,0.00730896,-0.06896973,0.006641388,-0.007461548,-0.03237915,-0.0051841736,0.013206482,-0.038513184,0.017990112,-0.017044067,-0.048858643,-0.0027008057,0.0033607483,0.03390503,0.009117126,-0.0035305023,-0.008300781,-0.035217285,0.015266418,0.012329102,-0.010848999,-0.061431885,-0.0021209717,-0.017929077,0.005176544,0.03768921,-0.02507019,0.05218506,-0.015670776,0.08300781,0.02709961,0.025802612,0.030166626,0.022079468,0.03125,-0.009437561,-0.023727417,0.044891357,-0.023849487,-0.035064697,-0.013702393,-0.012962341,-0.07110596,-0.018310547,-0.014602661,-0.06964111,-0.010414124,0.0060806274,-0.017822266,0.019363403,-0.088134766,-0.009498596,0.012916565,0.0022258759,-0.0154418945,-0.021087646,-0.040405273,-0.004676819,-0.000006854534,0.021499634,0.02293396,-0.04095459,0.05105591,-0.0048332214,0.0513916,0.0029182434,0.0050735474,0.028335571,-0.005809784,-0.015029907,-0.036102295,-0.004180908,-0.00504303,-0.012481689,0.01499939,-0.001168251,-0.022827148,0.025756836,-0.022842407,0.022918701,-0.03253174,0.066711426,0.010795593,-0.016464233,0.019058228,-0.048309326,0.00340271,0.0020065308,-0.038909912,-0.009498596,0.03744507,0.0035686493,0.005302429,-0.026519775,-0.028137207,0.028808594,-0.02166748,0.00084877014,-0.0546875,-0.021759033,0.024597168,-0.028121948,0.013122559,0.04272461,-0.09832764,-0.000025510788,-0.025436401,0.012046814,-0.034423828,-0.015701294,0.0135269165,0.014007568,-0.0032444,-0.027114868,-0.005859375,-0.050201416,0.003479004,0.05596924,-0.013336182,0.022155762,-0.0055999756,0.006828308,0.020584106,0.015426636,-0.008659363,0.02748108,0.00067806244,-0.05810547,-0.074523926,-0.03503418,0.012458801,-0.025482178,-0.049102783,0.0073280334,-0.05029297,-0.061340332,-0.016860962,-0.01789856,-0.022109985,-0.050476074,-0.005821228,-0.02279663,0.002817154,-0.0005455017,-0.055908203,-0.024353027,-0.04550171,0.054107666,0.020751953,0.01171875,0.0005903244,0.036987305,0.051757812,0.028884888,0.01209259,-0.020339966,0.021514893,-0.020126343,0.059143066,0.012496948,0.018249512,-0.026412964,0.016662598,0.09307861,0.0028533936,-0.038269043,0.0021514893,-0.045654297,-0.038330078,-0.019729614,0.016540527,-0.00484848,-0.013313293,0.021102905,-0.023468018,-0.018966675,0.017227173,0.034088135,0.021759033,0.05834961,0.023223877,0.02078247,0.031173706,0.009155273,-0.028915405,0.0574646,0.033477783,0.013671875,-0.029067993,-0.05709839,0.038482666,0.06530762,-0.029205322,-0.0054016113,-0.004875183,0.011894226,-0.014625549,-0.0043563843,0.022064209,0.012901306,-0.018432617,-0.024917603,-0.009544373,0.002916336,0.005420685,-0.02394104,-0.04736328,-0.08062744,0.0625,0.03781128,0.048583984,-0.012954712,-0.0066490173,0.0006971359,-0.02130127,-0.057922363,0.037872314,0.047821045,-0.02456665,-0.001914978,0.045562744,0.0025672913,-0.032714844,-0.021743774,-0.035949707,-0.022369385,-0.031433105,0.0034942627,-0.03668213,0.015701294,0.018722534,0.032684326,0.05105591,0.00081920624,-0.04534912,-0.036010742,-0.017181396,0.0058059692,-0.010307312,-0.012420654,0.014656067,0.014152527,0.021911621,0.006958008,-0.012420654,0.016708374,0.003036499,-0.0014810562,0.033599854,-0.01600647,-0.03149414,0.028305054,0.0001553297,-0.06347656,-0.0009551048,-0.011703491,0.04537964,-0.04525757,0.04119873,-0.031921387,-0.001209259,0.042663574,-0.019332886,-0.048553467,-0.0007557869,0.016693115,0.0574646,0.03274536,0.008102417,0.0078125,-0.048919678,0.04977417,0.0020217896,-0.008369446,0.012077332,0.029388428,0.018798828,-0.01260376,-0.0579834,-0.061920166,-0.012687683,-0.012382507,0.02935791,-0.0110321045,0.03591919,-0.01939392,-0.0034122467,-0.020965576,-0.007129669,-0.039154053,0.004173279,-0.02809143,0.01449585,-0.03567505,-0.04321289,-0.0016059875,-0.006351471,0.0046806335,-0.0022277832,0.0619812,0.015464783,-0.011558533,-0.012001038,-0.0037727356,-0.030960083,0.007221222,0.014457703,0.012992859,0.039642334,0.03756714,-0.032592773,0.0058670044,0.025375366,0.0043678284,0.011383057,0.008613586,-0.03010559,-0.04421997,-0.024856567,-0.019439697,-0.008514404,0.01979065,0.0025844574,0.008346558,0.0715332,0.016357422,-0.0079422,-0.017410278,0.021774292,-0.053894043,-0.0113220215,0.02015686,-0.0072135925,-0.0335083,0.0053100586,-0.01802063,-0.014678955,0.041748047,0.02444458,0.028625488,0.07281494,0.026901245,0.017364502,0.01071167,0.0101623535,0.038513184,-0.0013608932,-0.008453369,-0.025146484,-0.028305054,0.007774353,-0.017486572,-0.04522705,-0.05911255,0.04446411,0.037231445,0.06695557,0.022949219,0.0037078857,0.033447266,0.0008568764,0.011604309,-0.024734497,-0.024093628,-0.026016235,-0.017929077,0.039245605,-0.007659912,-0.014526367,-0.01953125,0.017318726,0.0069618225,0.009864807,-0.024337769,0.03869629,-0.019760132,-0.020721436,0.02015686,0.021148682,0.044403076,0.076660156,-0.037322998,0.004558563,0.021133423,-0.023254395,0.008644104,0.026123047,-0.010749817,-0.009880066,-0.037475586,-0.024658203,0.025131226,0.009941101,-0.049743652,0.024124146,0.010734558,0.037902832,0.015213013,-0.020935059,-0.047180176,-0.003408432,-0.015388489,-0.033599854,0.018569946,-0.036499023,0.013511658,0.046142578,-0.03253174,0.02973938,-0.0135269165,0.0021438599,0.007751465,0.01449585,0.009353638,-0.004322052,-0.04208374,0.042388916,0.0015087128,0.015823364,0.0076942444,0.03048706,0.019577026,0.017059326,0.03475952,0.01612854,-0.00039339066,-0.055755615,0.026977539,-0.026550293,-0.0024738312,0.030685425,-0.031585693,0.0049552917,0.0010290146,-0.024978638,-0.018951416,0.012420654,0.0056037903,-0.003736496,0.04611206,-0.032104492,-0.03970337,-0.06512451,-0.013381958,0.032836914,0.07147217,-0.0029621124,0.00554657,-0.034118652,0.0113220215,0.031036377,-0.00028967857,0.015014648,-0.015174866,-0.016448975,-0.008705139,-0.026397705,-0.038513184,-0.0013904572,0.043273926,-0.0019483566,-0.013885498,0.017227173,0.0069351196,0.0063171387,0.010864258,-0.008201599,0.025161743,-0.005104065,0.0041923523,-0.02029419,0.05569458,0.0061683655,-0.043762207,-0.052856445,0.03390503,-0.013473511,0.05645752,-0.030136108,-0.011962891,-0.0137786865,0.014190674,0.0068092346,-0.012794495,0.009994507,0.0033245087,-0.038879395,-0.05999756,0.014907837,0.00907135,0.024658203,0.022216797,0.011634827,0.043884277,-0.010185242,0.00844574,0.005264282,-0.031036377,-0.02558899,-0.05126953,-0.018692017,-0.02078247,-0.0079422,-0.033203125,0.019729614,-0.0016880035,0.01914978,0.00096559525,-0.020889282,0.0206604,0.016174316,0.005317688,0.0049705505,0.0053482056,0.013847351,0.024215698,0.014533997,-0.06100464,0.01525116,0.009117126,0.0066108704,-0.019943237,0.02960205,0.02508545,-0.027069092,0.0074005127,-0.00730896,-0.022399902,-0.028839111,-0.022827148,0.008453369,0.01914978,0.008148193,-0.034606934,0.030273438,0.00006121397,-0.02798462,-0.044403076,0.01260376,0.035308838,-0.042297363,0.00092601776,0.020706177,0.04812622,-0.032287598,0.010948181,0.01701355,0.04324341,0.023208618,-0.0028514862,0.0096206665,0.043182373,-0.014732361,0.008895874,-0.00592041,-0.007686615,0.007873535,0.005168915,0.02999878,-0.0016422272,0.010002136,-0.022064209,-0.028457642,-0.004131317,0.004966736,-0.011795044,0.022216797,0.023330688,0.041778564,-0.0051956177,0.020736694,0.027450562,-0.020553589,-0.010108948,0.009208679,0.028030396,-0.022018433,-0.006942749,0.01826477,0.00598526,0.029571533,-0.07531738,-0.008323669,0.0103302,0.007751465,0.008361816,-0.07788086,-0.0395813,-0.009231567,0.03149414,-0.011047363,0.01260376,0.023162842,-0.0016098022,-0.0019512177,0.01486969,-0.00021898746,-0.010887146,-0.0015993118,-0.050567627,-0.02748108,-0.0056648254,-0.0022583008,-0.014274597,0.019836426,-0.014137268,-0.028442383,0.009674072,-0.039276123,0.011390686,-0.015197754,0.00818634,0.042877197,-0.009132385,0.0181427,-0.0058555603,-0.012779236,-0.0033512115,0.0018835068,0.02734375,-0.03778076,0.030181885,-0.020980835,-0.004032135,-0.010765076,0.00919342,0.03277588,0.030075073,-0.011001587,0.025665283,-0.036895752,0.037200928,-0.02067566,0.0028152466,0.0057029724,-0.010429382,-0.009880066,-0.028274536,-0.009521484,0.04574585,-0.00831604,0.00025463104,-0.032165527,-0.038391113,-0.008392334,-0.06323242,0.025924683,0.015571594,0.042938232,-0.022567749,0.014671326,-0.0076446533,0.00094270706,0.008331299,-0.015655518,-0.0129470825,0.023468018,0.021209717,0.009437561,-0.025146484,-0.01737976,-0.0062217712,0.0028934479,-0.058258057,-0.04397583,-0.004497528,0.04156494,0.004383087,-0.0021629333,-0.029022217,-0.01083374,-0.0060653687,-0.037963867,0.016937256,-0.0070343018,0.029953003,-0.0040779114,-0.013465881,0.0002913475,0.0067443848,-0.006000519,0.04864502,0.0019016266,-0.016601562,-0.044006348,0.007820129,0.014259338,0.024917603,-0.0044555664,-0.03289795,0.008377075,-0.026245117,-0.039642334,-0.004737854,-0.00957489,-0.0052490234,-0.011306763,-0.009506226,-0.052612305,-0.00056886673,-0.032196045,-0.010543823,0.018325806,0.001200676,0.01411438,-0.007030487,0.0035419464,-0.012306213,-0.03491211,-0.016418457,0.011566162,0.011161804,0.010856628,0.010803223,0.054351807,0.00042319298,-0.030426025,0.0029850006,-0.013435364,0.003944397,-0.012329102,0.024414062,-0.0004930496,0.016784668,-0.0049438477,0.0025424957,-0.02973938,0.0015888214,0.06604004,0.019592285,0.01576233,-0.0103302,-0.002035141,0.011627197,0.026672363,-0.02078247,0.027191162,-0.019958496,0.02507019,-0.009590149,0.013183594,0.017227173,0.027145386,-0.02166748,-0.045196533,0.0043296814,-0.00072288513,-0.0015859604,-0.0703125,-0.037078857,-0.0680542,0.0014839172,0.000022470951,-0.01776123,0.012992859,0.0015134811,-0.014335632,-0.0949707,0.0008382797,0.054473877,0.017196655,0.02670288,-0.017028809,0.028839111,0.032226562,-0.014122009,-0.01965332,0.02166748,-0.037902832,-0.018539429,-0.021652222,0.035003662,-0.018844604,-0.020462036,-0.0035743713,0.016326904,0.018432617,0.008094788,0.0021018982,-0.020812988,0.0046310425,-0.006313324,0.001914978,-0.00774765,-0.008522034,0.050811768,-0.048706055,0.043884277,-0.0026493073,-0.016113281,0.012245178,0.038726807,0.026153564,-0.031463623,0.013435364,0.00730896,0.0036506653,0.046691895,-0.025466919,0.04763794,0.01675415,0.02078247,-0.0046081543,-0.019485474,-0.0030498505,-0.036712646,-0.01701355,0.027404785,0.0050086975,-0.007835388,-0.019622803,-0.010192871,0.008659363,0.00869751,0.011772156,-0.0073661804,-0.0018234253,-0.027770996,0.014373779,0.014480591,0.013465881,-0.0068969727,0.025970459,0.020751953,0.047607422,-0.016647339,-0.026855469,0.011192322,0.044158936,0.0019016266,-0.004295349,0.01902771,0.024261475,0.015144348,0.033996582,0.015556335,-0.034362793,-0.021057129,-0.021133423,-0.005432129,-0.0026874542,0.0010118484,-0.0069084167,0.008026123,-0.0011720657,0.0031738281,-0.023452759,-0.011497498,-0.0206604,-0.03869629,0.009666443,-0.015319824,0.02154541,0.026153564,0.0129852295,0.02394104,-0.009025574,0.037902832,-0.0017490387,-0.008758545,0.033050537,0.02784729,0.008056641,-0.021850586,0.006904602,-0.014533997,-0.0075416565,0.009292603,0.002166748,0.023849487,0.022125244,-0.01725769,0.002773285,0.009361267,0.021911621,-0.0043640137,0.009346008,-0.010375977,0.0014095306,-0.008277893,0.04446411,-0.059326172,0.034606934,0.013687134,-0.0015287399,0.012908936,-0.019973755,-0.009536743,0.026641846,-0.0052986145,0.0010690689,0.040771484,0.0011806488,0.036987305,-0.005897522,-0.027420044,0.0017671585,-0.025894165,-0.018951416,0.00038003922,-0.000869751,-0.0019950867,0.005558014,-0.03515625,0.018600464,-0.029815674,0.014961243,-0.0041542053,0.019699097,-0.02507019,-0.021255493,0.0041885376,-0.023208618,-0.028839111,-0.016799927,-0.020263672,0.05319214,0.020141602,0.017242432,0.017959595,0.007419586,0.009727478,-0.02468872,-0.022827148,-0.005558014,-0.0032291412,0.020462036,-0.04156494,0.04144287,0.058929443,0.0033988953,0.05670166,0.038146973,0.045074463,-0.0061569214,0.013160706,-0.03048706,0.026763916,-0.0231781,-0.0038757324,-0.005344391,0.026397705,-0.012741089,0.027008057,0.004386902,0.036712646,-0.04232788,0.03164673,0.07421875,0.010467529,0.0036067963,0.029769897,-0.011909485,-0.010505676,-0.01550293,-0.0087509155,0.04397583,-0.0029258728,0.029876709,0.034179688,0.01121521,0.0027484894,-0.0013313293,-0.009796143,-0.009124756,0.05279541,0.026733398,-0.012840271,0.0048103333,-0.027191162,0.005542755,-0.03186035,-0.0029525757,0.008644104,-0.0015363693,0.024093628,-0.0021209717,-0.016723633,-0.0008459091,0.010757446,-0.0068092346,0.010154724,-0.009346008,0.026367188,0.022415161,0.011375427,0.013687134,-0.0049209595,0.012329102,-0.029891968,-0.024353027,0.015281677,0.023025513,-0.013961792,-0.0016307831,0.027374268,0.020019531,0.040740967,0.043060303,-0.0015830994,-0.0006713867,0.028701782,-0.0030155182,-0.010749817,0.026870728,0.02671814,0.010757446,0.038116455,0.042541504,0.03765869,-0.019042969,0.018463135,-0.0056266785,-0.0052261353,-0.01751709,-0.00036358833,0.031707764,0.0012960434,0.0289917,0.013648987,-0.025939941,0.019744873,0.022079468,0.0015420914,-0.022247314,-0.0038490295,0.018798828,-0.01663208,0.01828003,-0.004135132,-0.010505676,0.020050049,0.0018434525,0.020309448,-0.014762878,0.023849487,-0.00207901,-0.019592285,-0.010543823,0.013633728,-0.05633545,0.028701782,-0.009727478,0.002325058,-0.052764893,0.0027332306,-0.011474609,0.0035171509,-0.00070762634,0.010437012,-0.008285522,-0.0020999908,0.04348755,0.027297974,-0.009819031,-0.016052246,-0.01739502,0.022521973,0.029571533,0.0008993149,-0.011726379,-0.0027332306,0.011634827,0.017791748,0.0038928986,-0.0015802383,0.0032424927,-0.011543274,-0.028244019,0.02658081,0.02848816,0.013977051,0.04522705,-0.027038574,-0.014228821,-0.00137043,0.01966858,-0.004432678,-0.035491943,-0.0008792877,0.012023926,-0.0158844,0.058685303,0.047302246,0.00178051,0.027313232,-0.00856781,-0.014442444,-0.0052948,-0.011772156,0.012687683,-0.019866943,0.011276245,0.009292603,0.023635864,-0.0385437,-0.033447266,-0.0093307495,-0.02178955,-0.020065308,-0.020370483,0.01689148,-0.011123657,0.00957489,0.03781128,0.008972168,-0.008399963,0.06726074,-0.025939941,0.03881836,0.004295349,-0.009742737,0.04260254,0.0154800415,0.02053833,-0.0007801056,0.010482788,-0.027908325,0.02293396,0.022583008,0.010253906,0.005706787,0.007572174,-0.018829346,0.028808594,-0.0064811707,0.039093018,0.0024356842,-0.023376465,0.020004272,-0.016799927,-0.024765015,-0.00907135,-0.0019760132,0.021652222,0.031555176,-0.015426636,-0.014137268,-0.025177002,-0.019332886,0.02128601,-0.0129470825,0.0069351196,-0.0046577454,-0.008491516,0.019851685,-0.016204834,-0.009117126,0.011184692,0.036865234,-0.050628662,-0.006038666,0.001376152,0.025924683,-0.014709473,0.020309448,0.033203125,-0.0019721985,0.003206253,0.036865234,-0.0063591003,0.0385437,0.00484848,0.039794922,0.031707764,-0.010353088,-0.019439697,0.0035686493,0.015975952,-0.02960205,0.018676758,0.044952393,-0.018051147,0.0025081635,-0.0158844,-0.008277893,-0.011054993,-0.003786087,-0.008346558,-0.0011615753,0.0025558472,-0.018249512,0.015808105,0.0062179565,-0.008811951,-0.013145447,0.02053833,-0.018493652,0.0032653809,0.04043579,0.01638794,-0.051971436,-0.0051956177,0.019378662,-0.007881165,-0.011245728,-0.020446777,-0.008216858,-0.039215088,0.0018901825,0.008277893,0.029342651,-0.0037937164,-0.027770996,0.0046043396,0.0052452087,0.008453369,0.041931152,0.008918762,-0.014785767,0.0021362305,-0.01374054,-0.0014572144,-0.018432617,-0.018493652,0.01890564,0.026290894,0.0066490173,-0.025177002,0.025268555,-0.0020713806,0.011482239,0.011993408,0.0017642975,0.011436462,-0.02331543,-0.01586914,-0.003036499,0.0132369995,-0.008338928,-0.029891968,-0.009559631,0.026855469,0.055236816,-0.021713257,-0.0027980804,0.013725281,0.023788452,0.017333984,0.028640747,0.025680542,0.03866577,0.02507019,0.0019607544,-0.012794495,0.011924744,-0.021240234,-0.017196655,0.01838684,-0.020629883,-0.01966858,0.022994995,0.005065918,0.012329102,-0.020599365,-0.009590149,-0.013175964,-0.01876831,0.0138168335,0.0021629333,0.011772156,-0.0463562,-0.028198242,0.018829346,-0.012199402,-0.008712769,-0.019042969,-0.009986877,-0.018325806,-0.061065674,0.014732361,-0.0137786865,-0.0054512024,-0.014984131,0.017700195,0.024490356,0.03564453,0.0015287399,-0.010223389,-0.02027893,0.044036865,0.022155762,0.02848816,0.018371582,-0.02494812,-0.030075073,-0.013511658,-0.0032901764,-0.014373779,0.037597656,-0.025894165,0.020324707,0.021972656,-0.03451538,-0.00009292364,-0.0014047623,-0.010551453,-0.0040740967,-0.025390625,-0.0046844482,0.008758545,0.025802612,-0.0011320114,0.004737854,0.02381897,-0.024291992,-0.00957489,0.039764404,0.023666382,0.0003478527,0.04498291,-0.015174866,0.00004607439,-0.023742676,-0.003967285,-0.005306244,0.0025844574,-0.0008158684,0.03668213,0.019821167,0.027954102,0.012573242,-0.006996155,0.0046157837,0.04019165,0.022216797,0.0032653809,0.022628784,0.00072717667,-0.0038261414,-0.02116394,-0.006641388,0.035003662,0.035461426,0.0049819946,0.009147644,-0.011100769,0.0052452087,-0.021697998,0.006095886,0.039794922,-0.019561768,-0.029769897,0.007713318,-0.014778137,0.017456055,-0.026138306,0.0021419525,0.0018930435,0.011077881,-0.00022542477,-0.03302002,-0.012870789,0.019180298,0.0052223206,-0.0132751465,-0.014732361,-0.0034809113,0.027450562,-0.024887085,0.012214661,-0.06185913,-0.024276733,-0.015068054,-0.01600647,0.011672974,-0.0154953,-0.0075683594,-0.007965088,-0.012992859,-0.003194809,0.014030457,-0.00046515465,-0.012519836,-0.011474609,-0.0066604614,0.039489746,0.0009832382,0.021087646,-0.0039024353,0.0063323975,-0.0020389557,-0.0033016205,0.016098022,-0.0073890686,0.03677368,0.0104599,-0.0020618439,0.020889282,-0.0014877319,0.023727417,-0.013130188,-0.009780884,0.00043940544,-0.006336212,0.03692627,-0.005748749,-0.017074585,0.014854431,-0.0104904175,-0.045898438,0.012435913,0.020446777,0.025543213,-0.016647339,0.058898926,-0.0022354126,-0.015792847,0.012687683,0.013267517,-0.019363403,0.006072998,0.013702393,-0.006778717,0.00472641,-0.0050239563,-0.0129470825,-0.022857666,-0.02458191,0.008712769,-0.00491333,-0.0039520264,0.010292053,0.024902344,0.034057617,-0.00046515465,0.030166626,0.0357666,0.005207062,0.032043457,0.012619019,0.04248047,0.002254486,-0.029342651,0.0005931854,0.001414299,-0.016693115,0.015548706,-0.0046653748,0.0011634827,-0.029342651,-0.010765076,0.013259888,0.02067566,-0.00004005432,0.016159058,-0.014564514,-0.004257202,-0.014175415,0.007320404,-0.023742676,0.0020828247,0.0357666,0.019226074,0.01939392,-0.017929077,-0.017181396,0.016647339,0.024017334,-0.0045051575,-0.027038574,-0.0018281937,0.013977051,0.0021514893,0.012077332,0.00013113022,-0.035217285,-0.02885437,-0.0061683655,0.0035209656,0.01537323,-0.018875122,0.01991272,0.008132935,-0.025741577,-0.0033683777,0.018066406,-0.0077590942,-0.013885498,0.015029907,0.003490448,0.01802063,0.0309906,-0.018753052,0.008277893,0.014350891,-0.04611206,0.056884766,-0.015174866,0.026916504,-0.013916016,-0.0020885468,-0.025848389,-0.009925842,-0.009048462,-0.015853882],"createdAt":"2026-04-18T18:43:35.195Z","updatedAt":"2026-04-24T20:02:27.711Z","lastSeenAt":"2026-04-24T20:02:27.711Z","tsv":"'/api':158 '/api/v1/cards/41/transactions':41,149 '/docs':157 '/pricing':159 '/readme':161 '/request':139 '0.02':77,138 '000':68 '20':67 '402':207 '6':73 'Base network API' 'USDC micropayment API' 'accept':47 'across':110 'actual':190,211 'addit':108 'advertis':62 'ai/ml':112 'analysi':114 'api':81 'attach':90 'base':9,24,57,69 'base-network' 'behind':42 'bodi':195 'broader':103 'call':13,28 'caller':88 'card':5,20,37 'card data endpoint' 'card transactions API' 'card-transact':4,19 'card-transactions' 'cards/41/transactions':188 'challeng':61,208 'classif':116 'connect':167 'content':173 'convers':132 'cost':65 'cover':146 'crawl':156 'data':214 'data/analytics':111 'decim':74 'descript':184 'document':151 'embed':117 'endpoint':7,22,32,109,150,199 'equal':76 'estim':126 'exampl':181 'exchang':121 'expect':197 'expos':35 'extrem':153 'feed':120 'finance/web3':118 'form':206 'function':212 'gas':125 'gate':3,18 'generat':133 'geocod':130 'header':95 'howev':142 'infrastructur':128 'key':82 'limit':85 'list':106,145 'live':201 'lowpaymentfee' 'lowpaymentfee.com':34,104 'maximum':64 'model':215 'network':58 'numer':107 'openapi':177 'page':162 'pay':11,26 'pay-per-cal':10,25 'pay-per-call API' 'pay-per-request' 'payment':52,94,100 'paywal':45 'per':12,27,78 'platform':105 'point':141 'post':48,194 'post-endpoint' 'price':119,140 'prompt':169 'proof':101 'quot':124 'rate':84,122 'remain':216 'request':49,79 'request/response':180 'requir':87 'resourc':39,189 'return':164,191,202 'schema':178 'sentiment':113 'settl':51 'simpli':89 'spars':154 'specif':144 'substant':172 'summar':115 'token':123 'transact':6,21,38 'unclear':217 'unit':70 'usdc':15,30,54,72 'usdc-settlement' 'util':129 'valid':98,131 'wallet':168 'well':205 'well-form':204 'x':93 'x-payment':92 'x402':2,17,44,60,99 'x402 payment endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"7e4a67dd-c46f-404a-966d-58d14655bd71","listingId":"77b5e031-9021-40d0-bb16-0754ccdacc47","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/cards/41/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:35.195Z"}],"sources":[{"listingId":"77b5e031-9021-40d0-bb16-0754ccdacc47","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/41/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:35.195Z","lastSeenAt":"2026-04-24T20:02:27.711Z"}],"details":{"listingId":"77b5e031-9021-40d0-bb16-0754ccdacc47","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/41/transactions \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/41/transactions"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/41/transactions"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /api, /pricing, and /README pages contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or creating card transaction records via a pay-per-call model","Integrating card transaction data into agent workflows without API key management","Programmatic access to card transaction information settled in USDC on Base"],"bestFor":["Agents that need card transaction data with zero-signup access","Developers wanting to test x402 payment flows on Base","Use cases requiring per-request billing with no subscription commitment"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume use cases where per-request pricing at $0.02 may be costly","Anyone needing clarity on what data fields are returned before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.863Z"},"updatedAt":"2026-04-24T20:02:27.711Z"}}