{"id":"3ca0dfb3-7e47-4536-9881-b3bf4ceaf852","shortId":"p47fPm","kind":"x402","title":"x402-gated card transaction endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card transaction endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a card transactions resource via the x402 payment protocol. The specific path `/api/v1/cards/5/transactions` accepts POST requests and is gated behind a per-call USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD) per request, settled to a specified wallet address.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific `/api/v1/cards/5/transactions` endpoint is not listed on the homepage among the advertised APIs, and no documentation describes its request or response schema.\n\nBecause the crawled docs pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, the actual functionality, expected request body, and response format for this endpoint remain unknown. Users should treat this as a minimally documented endpoint and test carefully before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 payment API","USDC micropayment endpoint","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["The /api/v1/cards/5/transactions endpoint is not listed among the provider's advertised APIs on the homepage — its purpose is unclear.","All documentation pages (/docs, /api, /pricing, /README) returned no substantive content, only a 'Connect wallet' prompt.","No request body schema or response schema is available; the endpoint's actual functionality is unknown.","The endpoint references 'cards/5' which may be a specific resource ID rather than a general-purpose API path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/5/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/5/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 (returns a valid x402 402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific cards/5/transactions path is not listed among the provider's advertised APIs. All doc pages returned only 'Connect wallet' with no content.","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":"2026-04-19T02:49:54.038Z","embedding":[-0.044403076,-0.024505615,0.04119873,0.0065193176,0.016174316,-0.036315918,-0.02848816,0.027938843,0.085632324,-0.060699463,0.02810669,-0.04559326,-0.06323242,-0.01626587,-0.029647827,-0.004211426,-0.0096588135,0.012962341,-0.020309448,0.034606934,0.034118652,-0.029586792,-0.015464783,0.015731812,-0.012069702,0.0010976791,0.014434814,-0.009399414,-0.017913818,-0.043762207,0.04876709,-0.01737976,-0.021469116,-0.004398346,-0.0037593842,0.021560669,-0.011108398,0.041412354,0.037750244,-0.023895264,0.0063438416,-0.059173584,0.012825012,-0.0059890747,-0.032806396,-0.0016622543,0.005214691,-0.051940918,0.0062294006,-0.008865356,-0.03945923,-0.023117065,-0.001739502,0.035125732,0.025360107,0.007587433,-0.00012791157,-0.041534424,0.022720337,0.031097412,-0.012802124,-0.06890869,-0.008338928,-0.015449524,0.005218506,0.045562744,-0.01687622,0.040283203,-0.007858276,0.085754395,0.018569946,0.028656006,0.03250122,0.02229309,0.008934021,0.004497528,-0.022735596,0.049926758,-0.022888184,-0.033325195,-0.005622864,-0.010848999,-0.061187744,-0.0126953125,-0.019348145,-0.072021484,-0.0034217834,-0.002407074,-0.01612854,0.018295288,-0.08947754,-0.007820129,-0.0068511963,0.009712219,-0.02154541,-0.0070343018,-0.023895264,-0.013259888,0.008399963,0.015975952,0.0317688,-0.04220581,0.0574646,0.015686035,0.052703857,0.01322937,0.0019388199,0.036010742,-0.00554657,-0.0046806335,-0.01600647,-0.002729416,-0.014381409,-0.0048217773,0.027236938,-0.0009727478,-0.011238098,0.02456665,-0.028869629,0.025604248,-0.041809082,0.055511475,0.0090789795,-0.019226074,0.0137786865,-0.041534424,-0.0069465637,-0.001074791,-0.035583496,-0.004917145,0.03074646,0.0018777847,0.017868042,-0.014404297,-0.0143966675,0.022903442,-0.02017212,-0.0021896362,-0.058929443,-0.01776123,0.024673462,-0.026473999,0.014968872,0.048858643,-0.101867676,0.0033779144,-0.038879395,0.022155762,-0.0491333,-0.010902405,0.020263672,0.015914917,-0.006126404,-0.02458191,-0.005367279,-0.053466797,-0.010650635,0.036010742,-0.014434814,0.032318115,-0.016952515,0.015792847,0.016311646,0.004501343,0.008285522,0.029464722,-0.012039185,-0.053619385,-0.0748291,-0.021255493,0.009170532,-0.025100708,-0.054016113,0.005924225,-0.054351807,-0.07574463,-0.033050537,-0.02267456,-0.022415161,-0.029464722,-0.018127441,-0.02923584,0.0018949509,-0.011985779,-0.05706787,-0.006542206,-0.03942871,0.048461914,0.021514893,0.018966675,0.010787964,0.017318726,0.049926758,0.031433105,0.0055885315,-0.027633667,0.020401001,-0.026657104,0.042144775,0.006958008,0.021484375,-0.04724121,0.01828003,0.0848999,-0.0039100647,-0.039733887,0.0012845993,-0.039031982,-0.026901245,-0.009246826,0.010749817,0.0010786057,-0.03567505,0.023391724,-0.033599854,-0.010116577,0.008071899,0.025741577,0.019714355,0.05355835,0.014709473,0.00579834,0.0362854,0.01676941,-0.052703857,0.04559326,0.023345947,0.013793945,-0.029541016,-0.04714966,0.024459839,0.07116699,-0.018341064,-0.010749817,-0.01651001,0.014732361,-0.015182495,0.0073242188,0.019210815,0.0020160675,-0.03439331,-0.03378296,-0.01789856,0.0040397644,-0.0049438477,-0.020080566,-0.04837036,-0.07702637,0.066711426,0.054656982,0.02720642,-0.019729614,-0.012817383,-0.010284424,-0.014671326,-0.054473877,0.04928589,0.06512451,-0.0054397583,-0.00579834,0.055358887,0.0028629303,-0.01802063,-0.027862549,-0.03375244,-0.030075073,-0.030670166,0.0016622543,-0.03225708,0.023498535,0.029922485,0.027282715,0.04257202,-0.006549835,-0.047698975,-0.0287323,-0.024780273,0.012718201,-0.018814087,-0.01537323,0.013000488,0.009162903,0.020874023,0.0007824898,0.0010070801,0.010131836,0.0070152283,-0.0042152405,0.01878357,-0.023605347,-0.03640747,0.031280518,-0.0043640137,-0.052001953,0.007209778,-0.002090454,0.045654297,-0.039642334,0.037200928,-0.027526855,-0.005748749,0.044189453,-0.022323608,-0.04156494,-0.00077676773,0.0115356445,0.055023193,0.036590576,0.001912117,0.012870789,-0.044525146,0.05987549,-0.0031471252,-0.00466156,0.009506226,0.038848877,0.016281128,-0.009361267,-0.042510986,-0.053771973,-0.012435913,-0.015449524,0.03643799,-0.02293396,0.05142212,-0.023757935,0.0003080368,-0.026550293,-0.0071105957,-0.036132812,0.007095337,-0.023757935,0.005722046,-0.039001465,-0.040252686,0.019500732,-0.0018663406,-0.008636475,-0.008125305,0.055511475,0.020477295,0.006576538,-0.021270752,-0.009300232,-0.021026611,0.008216858,0.024887085,0.014083862,0.031402588,0.025039673,-0.026351929,0.0064926147,0.014480591,-0.0029296875,0.018417358,0.011146545,-0.015098572,-0.03741455,-0.026901245,-0.012336731,-0.00440979,0.02027893,0.0069351196,0.013870239,0.06414795,0.03036499,-0.01020813,-0.024597168,0.021728516,-0.058441162,-0.006164551,0.010498047,0.0009050369,-0.0368042,0.0061035156,-0.0143585205,-0.006965637,0.04562378,0.02986145,0.029434204,0.06945801,0.02281189,0.030548096,0.011497498,0.013717651,0.03967285,-0.021697998,-0.005191803,-0.018432617,-0.0345459,0.007522583,-0.01878357,-0.040985107,-0.060943604,0.04031372,0.04083252,0.0881958,0.018997192,-0.0005083084,0.028213501,-0.004135132,0.008682251,-0.018005371,-0.023422241,-0.030853271,-0.026473999,0.02822876,-0.0020809174,-0.010986328,-0.0140686035,0.027786255,0.013252258,0.006061554,-0.017837524,0.0440979,-0.020477295,-0.026306152,0.0115356445,0.020263672,0.030319214,0.060577393,-0.03591919,0.0087890625,0.018508911,-0.014343262,-0.004837036,0.023651123,-0.0009727478,-0.025802612,-0.03842163,-0.039978027,0.006263733,0.009674072,-0.04837036,0.032165527,0.012466431,0.055725098,-0.0037498474,-0.016082764,-0.028457642,-0.0026493073,-0.017868042,-0.027404785,0.016601562,-0.02154541,0.010505676,0.04824829,-0.018707275,0.0340271,-0.0063476562,-0.0012798309,0.004386902,0.016159058,0.0028324127,-0.008628845,-0.03616333,0.03652954,0.003314972,0.009407043,0.021606445,0.033966064,0.014030457,0.016799927,0.0418396,0.010383606,-0.0030078888,-0.038360596,0.02607727,-0.028579712,-0.011260986,0.02809143,-0.020889282,0.0027637482,-0.010139465,-0.016433716,-0.0075798035,0.017288208,0.0029754639,-0.010269165,0.05014038,-0.017532349,-0.035125732,-0.060943604,-0.021835327,0.031829834,0.07513428,0.010948181,0.007434845,-0.036468506,-0.0030002594,0.034454346,0.00073337555,0.01878357,-0.013427734,-0.015037537,0.0054893494,-0.035064697,-0.030776978,-0.005126953,0.0463562,-0.00092315674,-0.008575439,0.015357971,0.002418518,0.004070282,0.01789856,-0.0047302246,0.020217896,-0.007411957,0.0023536682,-0.01537323,0.036590576,0.0087890625,-0.043670654,-0.046844482,0.037841797,-0.019882202,0.04949951,-0.036224365,-0.014457703,-0.00818634,0.017456055,0.012016296,-0.017990112,-0.0069465637,0.0005760193,-0.03491211,-0.06695557,0.031311035,0.0025253296,0.014053345,0.026428223,0.01725769,0.04260254,-0.00018322468,0.00038790703,0.013175964,-0.030288696,-0.028717041,-0.042938232,-0.025314331,-0.025619507,-0.0067329407,-0.03086853,0.013076782,-0.0029716492,0.01864624,0.00036931038,-0.023147583,0.02432251,0.010986328,0.0019264221,0.0052833557,0.0107040405,0.019882202,0.022323608,0.020568848,-0.054656982,0.004447937,0.011436462,-0.0029506683,-0.010467529,0.03262329,0.023910522,-0.040985107,0.004470825,-0.0047073364,-0.01322937,-0.031311035,-0.022384644,-0.0028800964,0.026351929,0.007003784,-0.020935059,0.009765625,0.0042381287,-0.033813477,-0.04071045,0.021347046,0.038269043,-0.035583496,0.005874634,0.03543091,0.042663574,-0.03488159,0.010139465,0.008644104,0.042388916,0.020629883,-0.01121521,0.0105896,0.03829956,-0.015045166,0.0014858246,-0.0046195984,-0.01234436,0.0027770996,0.016082764,0.027633667,0.019729614,0.0012588501,-0.0259552,-0.038146973,-0.0043296814,-0.0015792847,-0.021087646,0.028289795,0.017730713,0.045043945,-0.0024757385,0.02822876,0.027740479,-0.014289856,-0.018859863,0.004108429,0.020202637,-0.012382507,-0.009109497,0.02128601,0.011772156,0.027740479,-0.077697754,-0.0070533752,-0.0040397644,0.010910034,0.0041007996,-0.06311035,-0.04360962,-0.0067825317,0.02658081,-0.0015249252,0.0102005005,0.017333984,-0.005630493,-0.007522583,0.024459839,-0.004688263,0.0047073364,0.0042762756,-0.0597229,-0.036590576,-0.010917664,-0.001329422,-0.023651123,0.018508911,-0.017837524,-0.019592285,0.00818634,-0.04196167,0.012313843,-0.02999878,0.006275177,0.032470703,-0.014442444,0.024398804,-0.0017738342,-0.020965576,-0.004562378,0.0055656433,0.03100586,-0.029968262,0.031143188,-0.017868042,-0.003982544,0.0030441284,0.021133423,0.030426025,0.039154053,-0.004676819,0.024932861,-0.03366089,0.038482666,-0.026809692,0.009025574,-0.012451172,-0.016159058,-0.020019531,-0.029693604,-0.0048942566,0.04510498,-0.009819031,-0.0029087067,-0.027740479,-0.03842163,-0.005405426,-0.055023193,0.01864624,0.0135650635,0.03869629,-0.023468018,0.012870789,-0.0006670952,0.0017337799,0.007183075,-0.017227173,-0.007972717,0.01939392,0.017929077,-0.0006556511,-0.018478394,-0.023529053,-0.0044441223,0.007675171,-0.048950195,-0.032318115,-0.006713867,0.0362854,0.0029697418,-0.0032749176,-0.026519775,-0.0057144165,-0.012062073,-0.030471802,0.023605347,-0.0010986328,0.023284912,-0.0025844574,-0.022918701,0.0022411346,0.011886597,-0.019927979,0.052001953,0.004501343,-0.008262634,-0.052459717,0.011299133,-0.011985779,0.020629883,-0.0041999817,-0.033416748,0.009140015,-0.032958984,-0.04498291,-0.0014181137,-0.009681702,-0.010192871,-0.006225586,-0.02029419,-0.05279541,-0.015007019,-0.028869629,0.0025920868,0.016586304,0.007686615,0.0014896393,-0.002023697,0.013511658,-0.025039673,-0.031982422,-0.02482605,0.017364502,0.009185791,0.0035648346,0.0126571655,0.055358887,-0.0011987686,-0.030288696,-0.00089788437,-0.009719849,0.014923096,-0.019165039,0.019729614,-0.0011291504,0.012229919,0.00042033195,-0.008323669,-0.032348633,0.008369446,0.055419922,0.0209198,0.010131836,-0.0085372925,-0.0062789917,0.016326904,0.02949524,-0.02255249,0.017486572,-0.021499634,0.033843994,-0.009689331,0.008834839,0.014045715,0.025039673,-0.020980835,-0.051361084,0.0010261536,0.010971069,-0.0056152344,-0.066345215,-0.040405273,-0.06677246,0.012763977,-0.010566711,-0.019439697,0.0010175705,-0.00018179417,-0.006454468,-0.07122803,0.002658844,0.044555664,0.022476196,0.031143188,-0.014823914,0.033843994,0.03881836,-0.014083862,-0.017852783,0.01625061,-0.037994385,-0.012901306,-0.021270752,0.035736084,-0.020706177,-0.027740479,0.001537323,0.017333984,0.023986816,0.0025959015,0.005176544,-0.020584106,-0.0008020401,0.0017566681,0.010925293,-0.0069885254,-0.001077652,0.039215088,-0.038238525,0.040039062,-0.006198883,-0.015235901,0.010955811,0.031555176,0.039123535,-0.03933716,0.012611389,0.007522583,0.008140564,0.04925537,-0.016586304,0.049926758,0.027404785,0.014221191,-0.006843567,-0.021408081,-0.008407593,-0.03086853,-0.020233154,0.032104492,0.0068893433,-0.00043845177,-0.025054932,-0.00466156,-0.0008196831,0.008232117,0.021591187,-0.013916016,-0.0072402954,-0.026168823,0.021255493,0.008529663,0.010177612,0.0019779205,0.015777588,0.009857178,0.046295166,-0.013763428,-0.03149414,0.0072364807,0.039001465,-0.0018320084,0.0005931854,0.020828247,0.019851685,0.0104599,0.041412354,0.025527954,-0.038970947,-0.024505615,-0.020767212,-0.014793396,-0.004459381,0.0012245178,-0.0051612854,0.0043411255,0.003829956,-0.009437561,-0.033355713,-0.011444092,-0.02279663,-0.037384033,0.012207031,-0.024917603,0.021270752,0.025466919,0.015853882,0.022109985,-0.014968872,0.027053833,0.0008068085,-0.0022239685,0.039794922,0.0368042,0.0000693202,-0.015655518,0.0048217773,-0.011192322,-0.019424438,0.019851685,-0.00003159046,0.025146484,0.015296936,-0.019454956,0.0138168335,0.0035514832,0.033416748,0.009506226,0.008644104,-0.0013551712,-0.0041503906,-0.021575928,0.04360962,-0.06329346,0.028915405,0.0037517548,0.0016422272,0.013916016,-0.011024475,-0.018951416,0.02923584,-0.0062179565,-0.007762909,0.039520264,-0.0012083054,0.033325195,-0.00623703,-0.026977539,0.0066871643,-0.020523071,-0.016998291,-0.00010108948,-0.0059928894,-0.009353638,0.0019664764,-0.028579712,0.021514893,-0.022125244,0.0068130493,-0.0064735413,0.011711121,-0.017074585,-0.015350342,-0.0030136108,-0.027328491,-0.019348145,-0.012680054,-0.016708374,0.0496521,0.032318115,0.004863739,0.015213013,0.018234253,0.0071792603,-0.024398804,-0.023742676,0.011024475,-0.0020103455,0.025772095,-0.038238525,0.046875,0.056121826,0.012435913,0.05279541,0.040222168,0.043395996,-0.014923096,0.011688232,-0.033721924,0.030227661,-0.023025513,0.006793976,-0.009056091,0.024093628,-0.028640747,0.026626587,-0.011665344,0.030166626,-0.043273926,0.028686523,0.0692749,0.010185242,0.0032901764,0.034301758,-0.014282227,-0.010101318,-0.016113281,0.00060129166,0.055603027,0.0023384094,0.036895752,0.028564453,0.023834229,0.009651184,0.0049591064,-0.019714355,-0.011833191,0.046722412,0.029937744,-0.018997192,0.011886597,-0.024475098,0.002500534,-0.038391113,-0.010810852,-0.00048446655,-0.008934021,0.021621704,-0.0025939941,-0.018615723,0.00233078,0.015335083,-0.009963989,0.010925293,-0.007347107,0.015182495,0.025299072,-0.003200531,0.018920898,0.0007314682,0.014823914,-0.011161804,-0.031829834,0.014434814,0.033813477,-0.0071792603,-0.0043411255,0.040222168,0.015563965,0.03942871,0.041748047,-0.013473511,0.0041275024,0.03161621,0.0013151169,-0.018081665,0.024780273,0.029968262,0.015945435,0.04296875,0.04763794,0.04434204,-0.013679504,0.015808105,-0.0066070557,-0.0015268326,-0.012161255,0.0031738281,0.0231781,0.0035381317,0.018249512,0.016311646,-0.031463623,0.029937744,0.019744873,0.003255844,-0.014770508,-0.0013589859,0.014305115,-0.011489868,0.0289917,0.0014095306,-0.009147644,0.0206604,0.011665344,0.019622803,-0.013000488,0.025772095,-0.0018291473,-0.020553589,-0.021118164,0.0064697266,-0.045684814,0.018310547,-0.010635376,0.0075416565,-0.046783447,0.008842468,-0.0013866425,-0.009109497,0.012306213,0.011497498,-0.011550903,-0.011207581,0.040130615,0.021835327,-0.015945435,-0.014030457,-0.017562866,0.031341553,0.038269043,0.010658264,-0.008323669,-0.00027513504,0.0059928894,0.013450623,0.0050468445,0.007461548,0.005203247,0.004009247,-0.028579712,0.023986816,0.02809143,0.026306152,0.041168213,-0.021194458,-0.0064811707,-0.0038089752,0.0335083,-0.0010814667,-0.036590576,-0.011917114,0.013931274,-0.015625,0.05480957,0.052215576,-0.0010910034,0.026382446,-0.004837036,-0.009971619,-0.0067749023,-0.015899658,0.009246826,-0.012756348,0.00573349,0.0012340546,0.02267456,-0.024032593,-0.03503418,-0.009117126,-0.015701294,-0.024627686,-0.025222778,0.0061836243,-0.0056648254,0.015586853,0.03765869,0.0181427,-0.0072288513,0.06088257,-0.021408081,0.030548096,0.0071411133,-0.003736496,0.06323242,0.026229858,0.032958984,0.003829956,0.006034851,-0.01399231,0.01651001,0.029342651,0.0084991455,0.007247925,0.019348145,-0.013053894,0.029800415,-0.00667572,0.03677368,0.0017976761,-0.019119263,0.01309967,-0.013038635,-0.02029419,-0.010971069,0.0037460327,0.030548096,0.042297363,-0.017700195,-0.012535095,-0.02659607,-0.023757935,0.023483276,-0.008918762,0.0034942627,-0.009567261,-0.012527466,0.016662598,-0.019760132,-0.018127441,0.014045715,0.037872314,-0.055877686,-0.012802124,0.0011472702,0.025924683,-0.019500732,0.025054932,0.030929565,0.00762558,0.0037460327,0.03289795,-0.007762909,0.046539307,-0.00036668777,0.046539307,0.022521973,-0.0060195923,-0.027740479,0.004764557,0.016998291,-0.019866943,0.0105896,0.04257202,-0.02508545,0.007980347,-0.012710571,-0.0050468445,-0.008110046,0.014785767,-0.01235199,0.0028057098,0.004863739,-0.014846802,0.014152527,-0.0045547485,0.000045895576,-0.01701355,0.016845703,-0.014907837,0.0048179626,0.032043457,0.010734558,-0.047943115,-0.0017175674,0.015159607,0.004863739,-0.006412506,-0.029815674,-0.0141067505,-0.047424316,0.0052337646,0.0060806274,0.025970459,-0.0011463165,-0.028945923,0.0015773773,0.020401001,0.018859863,0.039001465,0.006538391,-0.013404846,0.0042648315,-0.016647339,-0.004146576,-0.014419556,-0.015586853,0.026245117,0.030197144,-0.0012226105,-0.018737793,0.02204895,-0.0038146973,0.0036182404,0.010322571,0.0036354065,0.024353027,-0.013801575,-0.01776123,0.005832672,0.012527466,-0.009208679,-0.023712158,-0.019699097,0.023406982,0.056274414,-0.012825012,0.0035171509,0.01461792,0.019424438,0.018920898,0.0211792,0.037872314,0.043029785,0.026733398,0.0052986145,-0.009460449,0.023223877,-0.021560669,-0.022247314,0.02116394,-0.027511597,-0.034423828,0.025665283,0.013038635,0.016479492,-0.018218994,-0.00756073,-0.026275635,-0.013404846,0.0121536255,-0.008117676,0.016494751,-0.045074463,-0.017791748,0.015007019,-0.017959595,-0.01612854,-0.017486572,-0.011383057,-0.015731812,-0.05886841,0.008216858,-0.017364502,0.0017728806,-0.012298584,0.012413025,0.009460449,0.03488159,0.0042877197,-0.0051498413,-0.018432617,0.040893555,0.017242432,0.023635864,0.021316528,-0.013023376,-0.027175903,-0.012329102,0.0022201538,-0.004436493,0.036468506,-0.026855469,0.026931763,0.03161621,-0.03491211,-0.0054359436,0.004447937,-0.019546509,-0.01234436,-0.03289795,-0.012283325,0.0014629364,0.021240234,-0.012962341,0.005092621,0.03286743,-0.020904541,-0.018035889,0.043823242,0.034484863,0.00082969666,0.042938232,-0.014770508,-0.012504578,-0.011138916,-0.0007004738,-0.007926941,0.002702713,0.00522995,0.026809692,0.02470398,0.03161621,0.016235352,-0.02130127,0.010353088,0.02482605,0.031677246,-0.0020809174,0.036346436,0.0022220612,-0.008255005,-0.022781372,-0.00983429,0.028289795,0.041290283,0.012771606,0.016052246,-0.01486969,0.0026187897,-0.011817932,0.018066406,0.039123535,-0.019821167,-0.03564453,-0.009384155,-0.014930725,0.010177612,-0.019744873,0.0040283203,-0.006549835,0.007873535,0.0038146973,-0.020370483,-0.021911621,0.016235352,0.0004878044,-0.008148193,-0.018356323,0.0027828217,0.022506714,-0.0317688,0.012214661,-0.062042236,-0.019729614,-0.012527466,-0.0073661804,0.015602112,-0.013313293,-0.00166893,-0.009727478,-0.01146698,-0.008842468,0.015853882,-0.0023841858,-0.024337769,-0.0007686615,0.000538826,0.034057617,-0.00077199936,0.027679443,-0.00504303,0.007221222,0.0015993118,-0.013313293,0.010917664,-0.010810852,0.04071045,0.010368347,0.00390625,0.027877808,-0.008041382,0.022583008,-0.019454956,-0.0052108765,0.008651733,-0.004535675,0.036193848,-0.013442993,-0.02848816,0.010505676,-0.021850586,-0.051116943,0.012107849,0.0126953125,0.021697998,-0.023254395,0.061553955,-0.00045967102,-0.018981934,0.018966675,0.018478394,-0.031799316,0.00027656555,0.0146102905,-0.005443573,0.011238098,-0.011405945,-0.008926392,-0.027755737,-0.02255249,0.004638672,-0.0072784424,-0.008682251,0.0107803345,0.026901245,0.039978027,-0.009979248,0.03543091,0.033050537,0.0057792664,0.038208008,0.0065193176,0.049987793,0.001572609,-0.024230957,-0.008171082,0.0012960434,-0.01374054,0.019561768,-0.0076942444,-0.0010128021,-0.02406311,-0.0107040405,0.016159058,0.03274536,-0.016555786,0.015563965,-0.017028809,-0.009254456,-0.02268982,-0.0028839111,-0.021621704,0.011039734,0.03414917,0.018600464,0.01953125,-0.018371582,-0.02532959,0.00982666,0.031585693,-0.0067329407,-0.031402588,-0.014984131,0.013015747,0.011299133,0.00491333,0.0039520264,-0.034576416,-0.026779175,0.000057280064,0.008010864,0.012741089,-0.009681702,0.020095825,0.010597229,-0.024810791,-0.009223938,0.020263672,-0.014503479,-0.011291504,0.007499695,-0.0029239655,0.036224365,0.030639648,-0.028518677,0.008659363,0.01461792,-0.04107666,0.06213379,-0.0095825195,0.013900757,-0.0071411133,0.0007801056,-0.029388428,-0.010887146,-0.00598526,-0.003063202],"createdAt":"2026-04-18T18:43:38.839Z","updatedAt":"2026-04-24T18:32:22.593Z","lastSeenAt":"2026-04-24T18:32:22.593Z","tsv":"'/api':179 '/api/v1/cards/5/transactions':48,152 '/docs':178 '/pricing':180 '/readme':181 '0.02':10,24,80,135 '000':75 '20':74 'Base network API' 'USDC micropayment endpoint' 'accept':49 'access':34 'actual':194 'address':89 'advertis':94,162 'ai/ml':106 'among':160 'analysi':109 'analyt':105 'api':102,140,163 'base':8,22,64,76 'base-network' 'behind':55 'bodi':198 'broader':91 'call':59,101 'card':4,18,37 'card transactions API' 'card-transactions' 'care':218 'challeng':68 'classif':111 'commit':148 'connect':186 'content':192 'convers':128 'cost':72 'crawl':175 'data':104,114 'describ':167 'doc':176 'document':166,214 'embed':112 'endpoint':6,20,30,131,153,204,215 'estim':122 'exchang':117 'expect':196 'feed':116 'finance/web3':113 'format':201 'function':195 'gas':121 'gate':3,17,54 'generat':129 'geocod':126 'homepag':159 'howev':149 'indic':69 'infer':107 'infrastructur':124 'key':141 'limit':144 'list':133,156 'lowpaymentfee' 'lowpaymentfee.com':32,92 'maximum':71 'minim':213 'minimum':147 'network':65 'no-api-key' 'page':177 'path':47 'pay':9,23,99 'pay-per-cal':98 'pay-per-call API' 'pay-per-request' 'payment':43,61 'per':11,25,58,82,100,136 'per-cal':57 'platform':93 'post':50 'price':115 'product':224 'prompt':188 'protocol':44 'provid':33 'quot':120 'rate':118,143 'reli':220 'remain':205 'request':12,26,51,83,137,169,197 'resourc':39 'respons':171,200 'return':183 'schema':172 'sentiment':108 'settl':84 'span':103 'specif':46,151 'specifi':87 'substant':191 'suit':96 'summar':110 'test':217 'token':119 'transact':5,19,38 'treat':209 'unit':77 'unknown':206 'usd':81 'usdc':14,28,60,79 'usdc-settlement' 'user':207 'util':125 'valid':127 'via':40 'wallet':88,187 'x402':2,16,42,67 'x402 payment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"62c4b4a6-0ad6-47fc-9aa2-7d2771384bfb","listingId":"3ca0dfb3-7e47-4536-9881-b3bf4ceaf852","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/5/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":"2026-04-18T18:43:38.839Z"}],"sources":[{"listingId":"3ca0dfb3-7e47-4536-9881-b3bf4ceaf852","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/5/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:38.839Z","lastSeenAt":"2026-04-24T18:32:22.593Z"}],"details":{"listingId":"3ca0dfb3-7e47-4536-9881-b3bf4ceaf852","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/5/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/cards/5/transactions"},{"claim":"The 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":"The homepage lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not include /api/v1/cards/5/transactions.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Submitting or querying card transaction data via a pay-per-call model","Integrating x402-compatible agents with financial transaction endpoints","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need to make per-call payments in USDC on Base","Low-volume, on-demand access to card transaction data without API key management"],"notFor":["Production workloads requiring well-documented request/response schemas","High-volume use cases where per-call pricing may be inefficient","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.744Z"},"updatedAt":"2026-04-24T18:32:22.593Z"}}