{"id":"12d498a5-268a-4b80-a4a4-3716315d41da","shortId":"NBX6hQ","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com exposes a card-transactions resource at `/api/v1/cards/64/transactions` behind the x402 payment protocol. It accepts POST requests and requires an X-PAYMENT header carrying a USDC payment on the Base network. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe provider's landing page lists a broad catalog of x402-gated APIs spanning data/analytics, AI/ML, finance/Web3, and infrastructure utilities, all priced at $0.02 per request. This specific endpoint appears to fall under a \"cards\" resource path, but the provider's existing description simply labels it \"Premium API Access\" without further detail on what data or functionality the transactions endpoint returns. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl — the docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt.\n\nBecause the endpoint is live (returns a well-formed 402 challenge) but lacks any documentation about request parameters or response format, agents should treat this as a functional but poorly documented service. The pricing model is straightforward: no API keys, no rate limits, pay-per-call via x402 on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 USDC endpoint","lowpaymentfee","Base network API","pay-per-call API","card data endpoint","402 payment API"],"warnings":["No OpenAPI or request/response schema available — the actual functionality of this endpoint is unknown.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no useful content.","The endpoint path references 'cards/64/transactions' but no explanation of what card 64 represents or what data is returned.","The provider lists many API categories on the landing page but this specific endpoint's purpose is unclear beyond the generic 'Premium API Access' label."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/64/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/64/transactions","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 challenge, but there is zero documentation on request parameters, response schema, or what 'card transactions' actually returns. The docs pages are empty. This is effectively a stub listing.","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":"2026-04-19T03:01:34.977Z","embedding":[-0.044036865,-0.031677246,0.05444336,-0.006706238,0.0107803345,-0.025863647,-0.023452759,0.027008057,0.07757568,-0.06951904,0.041381836,-0.043670654,-0.06088257,-0.030578613,-0.021575928,0.004337311,-0.005126953,0.010551453,-0.03378296,0.03213501,0.036590576,-0.011459351,-0.026382446,0.031951904,-0.0051460266,-0.0032176971,0.0022563934,-0.010177612,-0.0096206665,-0.05392456,0.04647827,-0.018112183,-0.010437012,-0.018035889,-0.003156662,0.015304565,-0.0056877136,0.04498291,0.051330566,-0.024353027,0.013580322,-0.054840088,0.0049858093,-0.0052871704,-0.030838013,-0.012969971,0.0138549805,-0.054595947,0.0016975403,-0.0021457672,-0.036102295,-0.0079422,-0.019973755,0.032318115,0.008987427,-0.0029449463,-0.0096588135,-0.0345459,0.016983032,0.021438599,-0.009361267,-0.05407715,-0.01398468,-0.011528015,0.009147644,0.05432129,-0.027450562,0.059295654,-0.009407043,0.08001709,0.025360107,0.03366089,0.034210205,0.017425537,0.0054512024,-0.009567261,-0.024459839,0.052001953,-0.008270264,-0.03250122,-0.008468628,-0.014862061,-0.0657959,0.0009431839,-0.016052246,-0.06323242,-0.007888794,-0.0015382767,-0.006336212,0.02619934,-0.07763672,-0.013282776,-0.0041656494,0.004989624,-0.026168823,0.0035934448,-0.038116455,-0.004798889,-0.0035247803,0.013114929,0.006591797,-0.043029785,0.042541504,0.019485474,0.053497314,0.012969971,0.014328003,0.041137695,-0.014060974,-0.021652222,-0.012702942,0.02458191,-0.012954712,-0.0021686554,0.02772522,0.00007414818,-0.018356323,0.03778076,-0.023849487,0.03010559,-0.048797607,0.052764893,0.0143966675,-0.026000977,0.009590149,-0.043121338,-0.006412506,0.0053863525,-0.033599854,-0.016937256,0.027008057,0.010475159,0.016830444,-0.022415161,-0.0154800415,0.016479492,-0.014266968,-0.01802063,-0.06274414,-0.030349731,0.02279663,-0.030319214,0.018615723,0.04849243,-0.091552734,0.0007314682,-0.036224365,0.017181396,-0.034973145,-0.009002686,-0.004447937,0.019592285,0.00084733963,-0.026367188,-0.0057296753,-0.04147339,-0.00705719,0.042999268,-0.004383087,0.02619934,-0.019439697,0.006843567,0.017059326,0.015029907,0.013061523,0.018920898,-0.02861023,-0.070739746,-0.07623291,-0.03152466,0.008972168,-0.022018433,-0.048217773,0.0024356842,-0.03439331,-0.07940674,-0.047973633,-0.009513855,-0.014419556,-0.032409668,-0.01247406,-0.0418396,0.009895325,-0.005508423,-0.054779053,-0.0015535355,-0.0435791,0.049926758,0.027008057,0.017166138,0.0178833,0.007457733,0.057647705,0.016860962,-0.0026378632,-0.01763916,0.020584106,-0.016281128,0.035736084,0.0096588135,0.011642456,-0.042877197,0.02659607,0.083496094,-0.007736206,-0.0340271,0.008308411,-0.04547119,-0.022277832,-0.006095886,0.026412964,0.0034637451,-0.023986816,0.007633209,-0.030273438,-0.02861023,0.012840271,0.024475098,0.027114868,0.051635742,0.00957489,0.006958008,0.017211914,0.0067977905,-0.035217285,0.052734375,0.028823853,0.01852417,-0.030319214,-0.05340576,0.027648926,0.05831909,-0.019851685,-0.003900528,-0.0143966675,0.027755737,-0.0039978027,0.007598877,0.024963379,-0.0064430237,-0.030761719,-0.030807495,-0.003917694,0.0061798096,0.0024871826,-0.025375366,-0.04840088,-0.074035645,0.07611084,0.05886841,0.031204224,-0.0107803345,-0.010231018,-0.022125244,-0.010131836,-0.070617676,0.05633545,0.068115234,-0.018844604,-0.009529114,0.041656494,-0.0007801056,-0.03289795,-0.016799927,-0.029693604,-0.013168335,-0.01727295,0.0070610046,-0.024505615,0.005504608,0.018432617,0.020339966,0.04046631,-0.007396698,-0.04763794,-0.034606934,-0.0057029724,0.0118637085,-0.0143585205,-0.0035762787,0.013221741,0.018295288,0.03289795,0.0013618469,0.0053710938,-0.0012874603,0.0008225441,0.0049362183,0.01701355,-0.018798828,-0.041259766,0.02218628,-0.0034046173,-0.06677246,0.008651733,-0.005657196,0.036132812,-0.047454834,0.041015625,-0.02507019,-0.013542175,0.060699463,-0.012504578,-0.035217285,-0.00554657,0.020050049,0.049957275,0.054382324,0.009338379,0.0043563843,-0.03262329,0.065979004,0.0054130554,0.0051116943,0.014213562,0.032958984,0.017471313,0.007217407,-0.058929443,-0.06359863,-0.0060691833,-0.012451172,0.04220581,-0.029022217,0.04916382,-0.02279663,0.00415802,-0.031555176,0.010353088,-0.04473877,-0.01348114,-0.01713562,-0.01322937,-0.036224365,-0.027862549,0.0071411133,0.0013475418,-0.013801575,-0.0069847107,0.06585693,0.015090942,-0.006542206,-0.021362305,-0.01802063,-0.020767212,0.0062294006,0.03302002,0.03112793,0.026519775,0.02923584,-0.0368042,0.008270264,0.012519836,0.011634827,0.022369385,0.0052337646,-0.0006828308,-0.043121338,-0.027938843,-0.01838684,-0.0043182373,0.02909851,0.012809753,0.007041931,0.06774902,0.032318115,-0.027267456,-0.010726929,0.019622803,-0.06561279,-0.0065689087,0.016174316,-0.008361816,-0.037902832,0.02041626,-0.01927185,0.013092041,0.040771484,0.03692627,0.024429321,0.06518555,0.039916992,0.016494751,0.019454956,0.02557373,0.037261963,-0.0009994507,-0.013725281,-0.028121948,-0.03213501,0.012466431,-0.025497437,-0.04840088,-0.060699463,0.034179688,0.03564453,0.09552002,0.030761719,0.0039787292,0.035003662,-0.005874634,0.012718201,-0.012863159,-0.031311035,-0.028060913,-0.027130127,0.032196045,-0.0043678284,-0.009521484,-0.016235352,0.028427124,0.014137268,0.018753052,-0.016433716,0.048828125,-0.011558533,-0.032226562,0.014602661,0.0067825317,0.03982544,0.06109619,-0.03390503,0.017089844,0.0048446655,-0.0362854,-0.009521484,0.018218994,-0.0015239716,-0.011451721,-0.037597656,-0.030166626,0.012397766,0.0030326843,-0.05630493,0.031433105,0.0050811768,0.034210205,0.00008136034,-0.01663208,-0.04638672,0.0077400208,-0.02104187,-0.03149414,0.00015461445,-0.025177002,0.01007843,0.049865723,-0.030883789,0.02331543,-0.013465881,-0.005355835,0.01576233,0.0050315857,-0.005065918,-0.01776123,-0.038482666,0.027389526,0.008094788,0.010284424,0.019607544,0.041503906,0.020080566,0.013595581,0.026748657,0.006752014,-0.0018930435,-0.037872314,0.023544312,-0.024780273,-0.009140015,0.023727417,-0.011550903,0.003320694,-0.015701294,-0.020614624,-0.019973755,0.014602661,0.005104065,-0.008476257,0.054534912,-0.029159546,-0.036193848,-0.06591797,-0.024810791,0.01576233,0.053863525,0.008911133,0.0063591003,-0.04135132,0.0096588135,0.03451538,0.002822876,0.026855469,-0.014328003,-0.0043640137,0.0033473969,-0.027679443,-0.020019531,-0.0007019043,0.03225708,-0.007572174,-0.02166748,0.017929077,0.0030002594,0.00070619583,0.0034236908,-0.001871109,0.021377563,-0.004962921,-0.004131317,-0.01701355,0.02998352,0.002155304,-0.026168823,-0.05819702,0.033203125,-0.003501892,0.058410645,-0.034576416,-0.012336731,-0.007850647,0.008468628,0.014625549,-0.015388489,-0.0026683807,-0.0077400208,-0.03378296,-0.074523926,0.033050537,-0.0029640198,0.030166626,0.027816772,0.0019044876,0.04345703,-0.0076560974,0.0015106201,0.013877869,-0.029174805,-0.030471802,-0.04345703,-0.033050537,-0.021606445,-0.011238098,-0.03665161,0.022369385,-0.012207031,0.00793457,-0.0019893646,-0.023880005,0.028121948,0.0035209656,-0.0036735535,0.01789856,0.0066223145,0.017684937,0.027160645,0.014320374,-0.041625977,0.011482239,0.002286911,-0.001991272,-0.011352539,0.03112793,0.018218994,-0.016921997,0.0048103333,-0.0010585785,-0.026779175,-0.033477783,-0.020935059,0.00806427,0.033081055,0.012313843,-0.011550903,0.0099487305,0.014877319,-0.025131226,-0.040008545,0.006324768,0.02508545,-0.037994385,0.0057907104,0.027130127,0.053131104,-0.02796936,0.005317688,0.009765625,0.03488159,0.025253296,-0.0027236938,-0.0050849915,0.034240723,-0.009971619,0.015472412,-0.0032138824,-0.023544312,-0.0015163422,0.0076560974,0.019577026,0.015670776,0.013946533,-0.027420044,-0.038360596,0.0041160583,0.0013589859,-0.018630981,0.022003174,0.025680542,0.03050232,-0.0012922287,0.03149414,0.022460938,-0.011695862,-0.00730896,-0.010292053,0.029769897,-0.023757935,-0.012535095,0.009963989,0.018997192,0.035888672,-0.06298828,-0.011672974,0.00274086,0.0023326874,-0.0006260872,-0.061462402,-0.03488159,-0.003622055,0.018875122,-0.0015411377,0.0034542084,0.02204895,-0.004737854,-0.0003669262,0.024642944,-0.012458801,-0.00995636,-0.0035705566,-0.061401367,-0.029342651,-0.008140564,-0.0012292862,-0.008964539,0.014587402,-0.011657715,-0.028015137,0.0058898926,-0.033599854,0.010765076,-0.019485474,0.01612854,0.043670654,-0.007820129,0.0143585205,-0.011474609,-0.012825012,-0.010040283,0.006252289,0.029464722,-0.035705566,0.02861023,-0.02746582,0.00062417984,0.00071811676,0.011634827,0.025344849,0.023010254,-0.009391785,0.018157959,-0.031677246,0.036956787,-0.020629883,0.011886597,-0.001452446,-0.029769897,-0.011039734,-0.024673462,-0.009262085,0.045776367,-0.007385254,-0.00655365,-0.033111572,-0.031463623,-0.0032806396,-0.05633545,0.01235199,0.024337769,0.037963867,-0.022201538,0.012756348,0.00667572,0.009841919,-0.0013561249,-0.0078125,-0.010940552,0.016616821,0.03277588,-0.00043296814,-0.02798462,-0.008926392,-0.008140564,0.0062713623,-0.059173584,-0.041900635,-0.023117065,0.028869629,-0.002904892,-0.0043411255,-0.024841309,-0.01713562,-0.0015325546,-0.038970947,0.028274536,-0.008407593,0.026031494,0.002023697,-0.020339966,-0.0058555603,0.0065689087,-0.012634277,0.05307007,0.004638672,-0.015457153,-0.047088623,0.008728027,0.0096206665,0.03353882,-0.01576233,-0.023620605,0.010528564,-0.035186768,-0.050872803,-0.009025574,-0.008132935,-0.00094270706,-0.018051147,-0.011260986,-0.057006836,-0.00021767616,-0.030654907,0.006706238,0.019378662,0.0059432983,0.0068092346,0.005252838,0.009140015,-0.018173218,-0.026275635,-0.026870728,0.01448822,0.01033783,0.011253357,0.013877869,0.05117798,-0.0021152496,-0.025772095,0.00819397,-0.009597778,0.019683838,-0.019561768,0.015853882,-0.008232117,0.020614624,0.0010509491,-0.0077552795,-0.039154053,0.009811401,0.06506348,0.020431519,0.0018348694,0.00020074844,-0.0015153885,0.01826477,0.041015625,-0.023605347,0.027267456,-0.015571594,0.03768921,-0.019088745,0.0051231384,0.017181396,0.013374329,-0.016799927,-0.04824829,-0.00016617775,0.010925293,-0.0019836426,-0.059692383,-0.03201294,-0.053741455,-0.014022827,-0.020339966,-0.0071411133,0.0005455017,0.0032749176,-0.015197754,-0.08441162,-0.00024676323,0.058044434,0.01626587,0.021133423,-0.014846802,0.02444458,0.03741455,-0.020812988,-0.017730713,0.020080566,-0.042541504,-0.024597168,-0.023757935,0.03744507,-0.020080566,-0.023376465,0.010681152,0.014060974,0.015670776,0.009895325,-0.00019919872,-0.025772095,0.0046958923,0.0011224747,0.014228821,-0.0031204224,-0.01687622,0.033294678,-0.039642334,0.04147339,-0.007675171,-0.011047363,0.0064086914,0.02822876,0.032989502,-0.041046143,-0.0018367767,0.021530151,-0.0034275055,0.04824829,-0.01914978,0.054382324,0.016159058,0.0077285767,-0.0015096664,-0.012619019,-0.02482605,-0.034118652,-0.033172607,0.034179688,0.0020637512,0.0043640137,-0.019317627,-0.012535095,0.00724411,0.015182495,0.018295288,-0.01600647,-0.013046265,-0.025512695,0.029159546,0.010505676,0.005420685,0.0012073517,0.02128601,0.016220093,0.047332764,-0.009109497,-0.021697998,0.019760132,0.037231445,0.004146576,0.0014305115,0.014694214,0.01826477,0.014709473,0.032714844,0.02053833,-0.05041504,-0.022628784,-0.011009216,-0.0121154785,-0.0026988983,0.014511108,-0.0067253113,0.004878998,0.012069702,-0.011222839,-0.025436401,-0.005897522,-0.027557373,-0.03050232,0.021347046,-0.019760132,0.013824463,0.030090332,0.01121521,0.0102005005,0.0011072159,0.036621094,-0.0022087097,-0.008880615,0.037139893,0.02255249,-0.00299263,-0.020004272,0.007858276,-0.013336182,-0.020141602,0.009765625,-0.005897522,0.023468018,0.026565552,-0.013504028,0.011985779,-0.00024330616,0.014030457,0.0047798157,0.004447937,-0.008422852,-0.0057868958,-0.019607544,0.036743164,-0.06048584,0.020080566,0.0077819824,0.003074646,0.00045704842,-0.011390686,-0.024230957,0.023513794,-0.0010614395,-0.0104904175,0.044067383,0.0024471283,0.042053223,-0.011505127,-0.030532837,0.0019798279,-0.028640747,-0.020935059,0.008583069,-0.01939392,-0.0047073364,0.0060806274,-0.031921387,0.029022217,-0.029205322,0.005367279,-0.0049362183,0.00762558,-0.010688782,-0.018630981,0.0016489029,-0.025024414,-0.028762817,-0.0040397644,-0.01737976,0.044769287,0.03439331,0.00970459,0.023223877,0.025680542,0.0055160522,-0.032836914,-0.027709961,0.012924194,-0.01576233,0.020324707,-0.023971558,0.039978027,0.044403076,0.01109314,0.05908203,0.028381348,0.04537964,-0.008262634,0.0138168335,-0.03253174,0.02406311,-0.01789856,0.009605408,-0.0029411316,0.042114258,-0.024383545,0.024993896,0.0008416176,0.029006958,-0.035583496,0.028457642,0.07305908,0.01210022,-0.0020751953,0.05102539,-0.012802124,-0.010421753,-0.012367249,-0.010391235,0.046905518,0.004776001,0.03024292,0.03277588,0.014755249,0.006931305,0.011627197,-0.022201538,-0.017608643,0.03805542,0.033935547,-0.015625,0.012672424,-0.031097412,0.0054092407,-0.04751587,-0.01184082,0.008956909,-0.0004067421,0.016693115,0.0026340485,-0.026794434,0.0012483597,0.016555786,0.0043792725,0.017654419,-0.011268616,0.02444458,0.029281616,0.0006041527,0.032470703,0.00283432,0.009719849,-0.023590088,-0.018707275,0.014602661,0.039489746,-0.010551453,0.006996155,0.025848389,0.020614624,0.02746582,0.044555664,-0.008552551,-0.008239746,0.030700684,-0.007396698,-0.0033435822,0.037597656,0.027160645,0.016586304,0.04260254,0.04220581,0.039093018,-0.025878906,-0.0021762848,-0.013320923,0.000064611435,-0.011314392,-0.004360199,0.022247314,-0.007633209,0.023101807,0.0063476562,-0.02229309,0.027679443,0.020004272,-0.00077342987,-0.015388489,-0.0018510818,0.015899658,-0.014045715,0.011985779,0.00010061264,-0.012634277,0.035247803,0.004005432,0.022232056,-0.012161255,0.023773193,-0.0037899017,-0.022109985,-0.013023376,0.008506775,-0.053955078,0.030838013,-0.009178162,-0.0033664703,-0.044799805,-0.0018863678,0.013320923,-0.0023918152,0.012123108,0.0053596497,-0.0037899017,-0.0043525696,0.047027588,0.038970947,-0.015960693,-0.02192688,-0.014213562,0.02897644,0.037597656,0.006275177,-0.0059127808,-0.0015230179,0.017059326,0.015899658,-0.00674057,0.010353088,0.0050621033,-0.006164551,-0.02848816,0.020004272,0.030426025,0.016189575,0.045776367,-0.022033691,-0.014457703,-0.0071792603,0.03781128,-0.0045661926,-0.032592773,-0.004573822,0.012702942,-0.014976501,0.050567627,0.038970947,-0.0050849915,0.036712646,-0.0138168335,-0.00894165,0.00349617,-0.022140503,0.0118637085,-0.022659302,-0.0018920898,0.0052986145,0.024475098,-0.020751953,-0.026870728,0.0009379387,-0.024932861,-0.022232056,-0.020507812,0.011779785,-0.009811401,0.010803223,0.039916992,0.014289856,-0.01084137,0.06628418,-0.02268982,0.028060913,0.0075149536,-0.005191803,0.06161499,0.018600464,0.036590576,0.015014648,0.0075035095,-0.022232056,0.020462036,0.019805908,0.015991211,0.005554199,0.013839722,-0.012802124,0.025970459,-0.010482788,0.034729004,-0.004371643,-0.013313293,0.004016876,-0.011390686,-0.013580322,-0.0107803345,0.0028953552,0.019332886,0.048034668,-0.027832031,-0.010681152,-0.025115967,-0.021774292,0.02998352,-0.012039185,0.0019874573,-0.00630188,-0.013618469,0.013824463,-0.018798828,-0.019088745,0.025009155,0.031036377,-0.05206299,-0.016601562,0.0025844574,0.027679443,-0.025878906,0.032684326,0.018966675,0.0005917549,0.007522583,0.04071045,-0.01159668,0.036254883,-0.009788513,0.03881836,0.019180298,-0.002614975,-0.027450562,0.0026187897,0.014579773,-0.024261475,0.011314392,0.027755737,-0.017593384,-0.00079870224,-0.012771606,-0.0036373138,-0.0056381226,0.018051147,-0.015289307,0.00856781,-0.013061523,-0.018844604,0.021728516,0.009506226,0.00037956238,-0.0028572083,0.013824463,-0.008056641,0.01574707,0.03479004,0.010124207,-0.055511475,-0.0059547424,0.012664795,0.0074768066,-0.01626587,-0.02532959,0.0033721924,-0.038024902,0.012527466,0.015174866,0.021942139,0.00080013275,-0.03149414,0.0046806335,0.021270752,0.016647339,0.036346436,0.0053138733,-0.0115737915,0.008087158,-0.007736206,0.0034656525,-0.012039185,-0.0016794205,0.02331543,0.017440796,-0.004547119,-0.02557373,0.020980835,-0.0011825562,0.005531311,0.011459351,0.0015602112,0.019500732,-0.014755249,-0.020935059,0.0025157928,0.015960693,-0.00712204,-0.011398315,-0.017303467,0.034057617,0.049804688,-0.018112183,-0.0063171387,0.021606445,0.030548096,0.022415161,0.029830933,0.025421143,0.043395996,0.02659607,-0.005756378,-0.020874023,0.016433716,-0.022445679,-0.03378296,0.024765015,-0.02255249,-0.022842407,0.029678345,0.010551453,0.007926941,-0.029907227,-0.0052261353,-0.019012451,-0.006126404,0.014717102,-0.0074424744,0.006259918,-0.038848877,-0.025543213,0.024246216,-0.016555786,-0.014122009,-0.016662598,-0.0038261414,-0.014007568,-0.05645752,0.011444092,-0.020706177,0.0031318665,-0.00016593933,0.008598328,0.017791748,0.030288696,0.00655365,-0.017028809,-0.0074310303,0.035583496,0.0090408325,0.017318726,0.023223877,-0.025100708,-0.023345947,-0.0155181885,0.006668091,-0.01979065,0.029022217,-0.02659607,0.025604248,0.030136108,-0.029678345,0.0009636879,-0.0034332275,-0.009925842,-0.00856781,-0.041229248,-0.020996094,0.0032577515,0.029205322,-0.015731812,-0.008132935,0.033843994,-0.025466919,-0.01033783,0.041137695,0.023391724,0.00957489,0.042053223,-0.009407043,-0.021865845,-0.016403198,0.0038700104,-0.008026123,0.0017442703,0.010940552,0.01751709,0.014320374,0.015670776,0.018096924,-0.017440796,0.013137817,0.03753662,0.022323608,-0.0057258606,0.025344849,0.0073280334,-0.0019292831,-0.016677856,-0.0004312992,0.028381348,0.034729004,0.011047363,0.0045776367,-0.004535675,0.013298035,-0.0068740845,0.010314941,0.032043457,-0.015403748,-0.034332275,-0.010467529,-0.021697998,0.0149002075,-0.0121154785,0.001206398,-0.001250267,0.0030269623,-0.0040512085,-0.026672363,-0.017349243,0.013763428,0.009780884,-0.014579773,-0.0074882507,-0.0004196167,0.020019531,-0.03262329,0.0103302,-0.06298828,-0.027526855,-0.022338867,-0.0154418945,0.020248413,-0.006881714,0.0003848076,-0.0027370453,-0.0109939575,-0.014656067,0.01184082,0.008003235,-0.025604248,-0.008728027,0.0077209473,0.029434204,-0.008300781,0.016799927,-0.011489868,0.0070381165,0.0014829636,-0.012611389,0.010848999,-0.010643005,0.03942871,0.0019664764,-0.0064926147,0.02760315,-0.0034637451,0.00497818,-0.013206482,-0.0044822693,-0.0017738342,-0.0066490173,0.031677246,-0.006324768,-0.030532837,0.010864258,-0.014968872,-0.042236328,0.011390686,0.011398315,0.028945923,-0.012809753,0.043121338,-0.00932312,-0.019683838,0.016342163,0.008110046,-0.025726318,0.004573822,0.018493652,-0.0019683838,0.008659363,-0.015045166,-0.0135269165,-0.030700684,-0.01247406,0.011016846,-0.009674072,-0.00774765,0.018112183,0.03387451,0.041931152,-0.00705719,0.020950317,0.03201294,-0.00016081333,0.041015625,0.0058631897,0.054107666,-0.00053453445,-0.029052734,-0.0074768066,-0.0068893433,-0.025283813,0.014678955,-0.005115509,0.000749588,-0.037353516,-0.011062622,0.019302368,0.030426025,-0.015625,0.014732361,-0.022750854,-0.010932922,-0.02078247,0.0036125183,-0.022506714,0.0052223206,0.025985718,0.02229309,0.019561768,-0.021835327,-0.027633667,0.012687683,0.027709961,-0.014915466,-0.038269043,-0.009864807,0.017868042,0.0138168335,0.0138549805,0.006614685,-0.025299072,-0.013748169,-0.004119873,0.01335907,-0.0036697388,-0.020477295,0.015823364,0.0069007874,-0.018432617,-0.0052223206,0.019363403,-0.006866455,-0.011627197,0.0082473755,-0.0007047653,0.025009155,0.03717041,-0.025619507,0.010528564,0.013298035,-0.04373169,0.059387207,-0.014915466,0.017562866,-0.011955261,0.008598328,-0.026870728,-0.011802673,-0.0071525574,0.0041275024],"createdAt":"2026-04-18T18:43:46.109Z","updatedAt":"2026-04-24T17:32:42.453Z","lastSeenAt":"2026-04-24T17:32:42.453Z","tsv":"'/api/v1/cards/64/transactions':42 '0.02':11,26,84,126 '000':76 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':96 '0x8335':81 '20':75 '300':99 '402':201 '402 payment API' '6':89 'Base network API' 'accept':49 'access':151 'address':95 'advertis':70 'agent':213 'ai/ml':118 'amount':73 'api':115,150,179,230 'appear':132 'base':9,24,65,77,242 'behind':43 'broad':109 'call':86,238 'card':5,20,38,137 'card data endpoint' 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'carri':59 'catalog':110 'challeng':69,202 'connect':188 'crawl':176 'data':157 'data/analytics':117 'decim':90 'descript':145 'detail':154,170 'doc':178 'document':171,206,222 'endpoint':7,22,32,131,162,193 'equal':83 'exampl':168 'exist':144 'expos':35 'fall':134 'finance/web3':119 'form':200 'format':212 'found':173 'function':159,219 'gate':3,18,114 'header':58 'infrastructur':121 'key':231 'label':147 'lack':204 'land':105 'limit':234 'list':107 'live':195 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':72 'model':226 'network':66 'openapi':165 'page':106,183 'paramet':209 'path':139 'pay':10,25,236 'pay-per-cal':235 'pay-per-call API' 'pay-per-request' 'payment':46,57,62,91 'per':12,27,85,127,237 'poor':221 'post':50 'post-endpoint' 'premium':149 'price':124,180,225 'prompt':190 'protocol':47 'provid':103,142 'rate':233 'readm':182 'render':185 'request':13,28,51,128,208 'request/response':167 'requir':53 'resourc':40,138 'respons':211 'return':163,196 'schema':166 'second':100 'sent':93 'servic':223 'simpli':146 'span':116 'specif':130 'straightforward':228 'timeout':101 'transact':6,21,39,161 'treat':215 'unit':78 'usdc':15,30,61,80,87 'usdc-base' 'use':88 'util':122 'via':239 'wallet':189 'well':199 'well-form':198 'without':152 'x':56 'x-payment':55 'x402':2,17,45,68,113,240 'x402 USDC endpoint' 'x402-gated':1,16,112 'x402-payment'","prices":[{"id":"2c9e6ea6-8197-4e64-ada4-b82c27bb828d","listingId":"12d498a5-268a-4b80-a4a4-3716315d41da","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/64/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":"2026-04-18T18:43:46.109Z"}],"sources":[{"listingId":"12d498a5-268a-4b80-a4a4-3716315d41da","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/64/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:46.109Z","lastSeenAt":"2026-04-24T17:32:42.453Z"}],"details":{"listingId":"12d498a5-268a-4b80-a4a4-3716315d41da","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# 1. POST to the endpoint without payment to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/64/transactions\n# 2. Parse the 402 response, construct payment proof, and resend:\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/64/transactions \\\n  -H \"X-PAYMENT: <signed-payment-payload>\" \\\n  -H \"Content-Type: application/json\"","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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/64/transactions"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/cards/64/transactions"}],"useCases":["Retrieving transaction data for a specific card via a pay-per-call model","Integrating card transaction lookups into agent workflows without API key management","Paying per request in USDC on Base for financial data access"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases needing keyless, pay-per-call card transaction data","Developers exploring x402 protocol integrations"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume batch processing where per-call pricing may add up","Non-crypto users who cannot settle payments on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.382Z"},"updatedAt":"2026-04-24T17:32:42.453Z"}}