{"id":"122b41db-12a2-4d76-a24b-f24039c6b06a","shortId":"yNKU9p","kind":"x402","title":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","tagline":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/5/transactions`. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint uses the x402 payment protocol (version 1, \"exact\" scheme). Callers must include an `X-PAYMENT` header containing a valid payment proof. The maximum amount required per call is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout window. The response MIME type is `application/json`.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint name suggests it retrieves or creates transactions for a specific portfolio (ID 5), but the exact semantics (read vs. write, required body fields, response shape) are unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","pay-per-request endpoint","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; request body and response format are completely unknown","The endpoint path is hardcoded to portfolio ID 5 with no explanation of what this portfolio represents","Cannot verify what data is actually returned or what POST body fields are accepted"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/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/portfolios/5/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and all doc pages render only 'Connect wallet'. The specific endpoint path (/portfolios/5) is hardcoded to a single portfolio ID with no explanation. 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":"2026-04-19T08:36:06.561Z","embedding":[-0.02255249,-0.020431519,0.025253296,0.0065231323,0.001666069,-0.029281616,-0.02267456,0.007408142,0.07879639,-0.06726074,0.009483337,-0.040130615,-0.022445679,-0.048614502,-0.010757446,0.0007529259,0.02027893,0.0064964294,-0.044555664,0.038360596,0.024002075,-0.03994751,-0.022567749,0.006752014,-0.018829346,-0.017227173,-0.029449463,-0.002325058,-0.035949707,-0.047058105,0.050689697,-0.026260376,-0.010932922,0.0035266876,-0.052337646,0.002937317,0.0023860931,0.03353882,0.03717041,-0.011680603,0.017059326,-0.04336548,0.011749268,-0.022445679,-0.037506104,0.015655518,0.014778137,-0.034179688,0.042419434,0.026138306,-0.03567505,-0.026763916,0.001660347,0.022399902,0.016433716,0.016525269,0.03186035,-0.010971069,0.007007599,0.028503418,-0.0022468567,-0.056915283,-0.0061798096,-0.014228821,-0.0077552795,0.05999756,-0.0357666,0.05505371,0.0019140244,0.076538086,0.022338867,0.032318115,0.009994507,0.03062439,-0.006389618,-0.0048713684,-0.008522034,0.062042236,-0.0069274902,-0.042510986,0.004573822,-0.0015439987,-0.06262207,-0.00063610077,-0.027557373,-0.035858154,-0.015930176,0.009094238,-0.042175293,0.028549194,-0.07562256,0.0028533936,0.0046806335,0.011886597,-0.0077323914,-0.0149002075,-0.0075683594,0.022018433,-0.013793945,0.025039673,0.0107040405,-0.021621704,0.0071907043,0.008018494,0.034454346,0.031280518,0.011451721,0.048797607,-0.0026397705,-0.00043535233,-0.055023193,0.012435913,0.0019235611,0.023864746,0.008010864,-0.012367249,-0.01966858,0.030654907,-0.023544312,0.019134521,-0.04876709,0.022598267,0.007293701,0.013427734,0.008399963,-0.040863037,-0.023025513,0.01399231,-0.028778076,-0.01789856,0.009254456,0.018325806,0.005847931,-0.009780884,-0.004535675,0.0059814453,-0.03753662,-0.014305115,-0.052612305,-0.039215088,0.029373169,-0.050231934,0.034454346,0.026657104,-0.103027344,0.012794495,-0.018661499,0.040527344,-0.020019531,-0.010421753,0.008766174,0.0090408325,-0.016998291,0.0042266846,-0.0053215027,-0.050079346,-0.00970459,0.027114868,-0.0020923615,0.033996582,-0.010322571,0.0335083,0.002275467,0.017608643,0.025161743,0.02835083,-0.004917145,-0.05496216,-0.07122803,-0.011001587,0.032318115,-0.0390625,-0.013442993,0.008331299,-0.015029907,-0.08911133,-0.024398804,-0.011764526,-0.017837524,-0.04421997,-0.018859863,-0.034606934,0.011787415,-0.027633667,-0.066711426,-0.0054969788,-0.012329102,0.052764893,0.018997192,0.030700684,0.05218506,-0.003982544,0.030380249,0.049102783,-0.020217896,-0.019515991,-0.0077552795,0.0053138733,-0.0057411194,-0.0075187683,0.017425537,-0.026611328,0.02583313,0.07678223,-0.012779236,-0.019073486,0.0066604614,-0.06262207,-0.037994385,-0.01133728,0.026733398,-0.0012350082,-0.0236969,0.02319336,-0.0030498505,-0.03253174,0.012054443,0.029251099,0.0045814514,0.06903076,0.018157959,0.014526367,0.03579712,-0.0066452026,-0.03213501,0.04699707,0.038391113,-0.0008158684,-0.009490967,-0.06225586,0.024612427,0.01285553,-0.015838623,0.00881958,0.0052223206,0.022277832,-0.024917603,-0.0037975311,0.012016296,-0.020233154,-0.010116577,-0.01914978,-0.01739502,0.022979736,0.008377075,0.005367279,-0.0287323,-0.091552734,0.04763794,0.03253174,0.047058105,-0.010681152,-0.011116028,-0.014175415,-0.0063209534,-0.059295654,0.046875,0.05343628,-0.019134521,-0.0057373047,0.029907227,-0.024124146,-0.02180481,0.0045433044,-0.023910522,-0.02268982,-0.009811401,-0.0055618286,-0.05557251,0.016693115,0.02571106,0.0317688,0.023498535,-0.009429932,-0.06365967,-0.0057754517,-0.030776978,0.013664246,-0.04550171,-0.0231781,0.00969696,0.02658081,-0.011772156,0.019821167,0.019500732,-0.0032615662,0.01436615,0.005279541,0.008239746,0.012084961,-0.02835083,0.025100708,0.011520386,-0.053527832,0.008804321,-0.0025634766,0.04928589,-0.039855957,0.032409668,-0.012893677,0.018447876,0.043060303,-0.019851685,-0.068603516,0.023162842,0.0077552795,-0.005832672,0.034484863,-0.01373291,-0.032165527,-0.02909851,0.07385254,-0.018218994,-0.026885986,0.0070266724,0.018554688,0.034729004,-0.01878357,-0.054504395,-0.020553589,-0.004989624,-0.034332275,0.020736694,-0.008872986,0.01751709,0.001584053,0.001909256,-0.0256958,-0.0056915283,-0.018661499,-0.0012702942,-0.023208618,-0.0006866455,-0.012130737,-0.008094788,0.029800415,-0.011894226,0.0004184246,0.01725769,0.04421997,0.0045814514,0.0074768066,-0.021240234,-0.03540039,-0.004337311,-0.023269653,0.027526855,0.049194336,0.006839752,0.02456665,-0.021881104,-0.01399231,0.020645142,0.01878357,0.03942871,0.009124756,-0.010185242,-0.07434082,-0.07775879,-0.03491211,-0.019897461,0.029830933,0.028152466,-0.006164551,0.037628174,0.02960205,-0.013282776,-0.050628662,0.029922485,-0.030548096,0.015602112,0.050842285,-0.014587402,-0.01727295,0.00217247,-0.010299683,-0.007888794,0.04397583,0.02104187,0.021820068,0.043151855,0.033081055,0.009399414,0.0073890686,0.0026569366,0.018463135,0.0005979538,-0.0019216537,-0.03366089,-0.017913818,0.001709938,-0.006378174,-0.028579712,-0.05960083,0.041015625,0.04425049,0.0960083,0.039764404,0.01209259,0.0031604767,-0.02470398,-0.0030498505,-0.022125244,-0.016525269,-0.042663574,-0.05227661,0.024307251,0.0005412102,0.02053833,-0.014518738,0.046142578,-0.008926392,0.022262573,-0.02243042,0.057525635,-0.015266418,-0.020614624,0.012916565,0.020812988,0.038238525,0.0670166,-0.0052833557,0.030654907,0.033355713,-0.03970337,0.0070343018,0.036071777,-0.019607544,-0.008300781,-0.038024902,-0.033691406,0.009300232,0.0036754608,-0.009315491,0.0024967194,-0.0009784698,0.041259766,0.026382446,-0.011833191,-0.0019216537,0.0005364418,0.014480591,-0.0345459,-0.011978149,-0.039642334,0.014823914,0.05441284,-0.017913818,0.001241684,-0.0026130676,-0.017913818,0.014678955,0.011650085,0.022644043,-0.0090408325,-0.017700195,0.032958984,-0.010986328,0.006149292,0.0025634766,0.03137207,0.019210815,0.021316528,0.050109863,0.01411438,-0.016860962,-0.060668945,-0.0019721985,-0.06829834,-0.009002686,0.053131104,-0.03881836,-0.0038852692,-0.013458252,-0.026504517,-0.002588272,0.005596161,-0.020339966,-0.008682251,0.0020446777,0.0036296844,-0.035980225,-0.05392456,-0.011054993,0.019897461,0.06945801,0.01953125,-0.002380371,-0.04547119,-0.000518322,0.026916504,-0.0030021667,0.03237915,-0.0131073,-0.00920105,-0.009925842,-0.034332275,-0.009109497,-0.00818634,0.013954163,0.009681702,0.007827759,0.019515991,0.014678955,0.022567749,0.0022392273,-0.011291504,0.017684937,-0.012237549,0.011909485,0.0026416779,0.056427002,0.0017642975,-0.037200928,-0.046569824,0.014053345,-0.008850098,0.032806396,-0.034454346,-0.02822876,0.010559082,0.0016584396,-0.020309448,-0.02444458,0.0074386597,-0.0042762756,-0.04748535,-0.04840088,0.048095703,-0.018157959,0.010284424,0.023605347,-0.00894165,-0.0028839111,-0.0105896,0.0044441223,-0.005596161,-0.018554688,-0.035217285,-0.04449463,-0.03942871,-0.043060303,-0.017822266,-0.037994385,0.029281616,-0.030548096,0.0287323,-0.0070762634,-0.03164673,0.027526855,0.007965088,0.010475159,0.014518738,-0.0031795502,0.01133728,0.029953003,0.006690979,-0.026382446,0.030059814,0.0022125244,0.006664276,0.00793457,0.04727173,0.011909485,-0.011138916,0.025939941,-0.016952515,-0.020751953,-0.030700684,-0.0067214966,-0.006198883,0.0025901794,-0.017456055,-0.038238525,0.028549194,0.006702423,-0.03756714,-0.05456543,0.009483337,0.017028809,-0.034729004,0.028060913,0.023086548,0.033569336,-0.022094727,0.024612427,0.007865906,0.040222168,0.042907715,0.012969971,-0.00095796585,0.0090408325,-0.011184692,0.017105103,0.009262085,-0.0013074875,0.010505676,0.013626099,0.039398193,0.0050582886,0.008605957,-0.022659302,-0.04031372,0.009056091,-0.014289856,-0.03567505,0.014442444,0.012382507,0.03930664,-0.004119873,0.031341553,0.029052734,0.004459381,-0.012641907,-0.0003774166,0.026992798,0.004306793,0.0073776245,0.005722046,0.008781433,0.030029297,-0.06378174,-0.0002565384,0.019851685,-0.00068616867,-0.003145218,-0.04638672,-0.04345703,0.010643005,0.033599854,0.011833191,0.008613586,0.024276733,0.008361816,-0.023773193,-0.0006518364,0.010772705,-0.009849548,-0.029907227,-0.04989624,-0.016479492,0.013839722,0.012214661,-0.007583618,0.02482605,-0.010345459,-0.021896362,0.014717102,-0.039611816,-0.006690979,-0.015151978,-0.0016508102,0.025619507,-0.0093307495,0.021652222,-0.01727295,-0.06298828,0.0034599304,-0.0018863678,0.05316162,-0.05218506,0.032196045,-0.008323669,-0.011672974,0.015930176,0.015037537,0.016082764,0.03753662,0.018707275,0.041290283,-0.041290283,0.05316162,-0.026885986,0.020339966,-0.0034675598,-0.034851074,-0.010124207,-0.011291504,-0.010696411,0.057769775,-0.03439331,-0.01550293,-0.047332764,-0.027938843,-0.0019741058,-0.053527832,0.014465332,0.025283813,0.041015625,-0.028503418,0.011390686,-0.009643555,0.015686035,-0.01739502,-0.02079773,-0.016998291,-0.0039482117,0.005382538,0.018936157,-0.008010864,-0.010688782,-0.0231781,0.010749817,-0.042388916,-0.047943115,0.014015198,-0.007369995,-0.016845703,-0.004749298,-0.023803711,-0.009880066,-0.00055933,-0.04345703,0.0010118484,-0.009712219,0.021240234,-0.00315094,-0.014205933,-0.015426636,0.021865845,-0.0076065063,0.032226562,-0.0016059875,-0.0072402954,-0.051483154,0.0093688965,-0.01689148,0.03074646,-0.01550293,-0.013916016,0.00029492378,-0.018051147,-0.055877686,-0.007820129,0.009162903,-0.022079468,0.003932953,-0.014541626,-0.029632568,0.016174316,-0.029632568,-0.011993408,0.007419586,-0.010116577,0.019088745,-0.007587433,0.02003479,0.024398804,-0.02835083,-0.015838623,0.010536194,0.008918762,0.014305115,0.03274536,0.035308838,-0.01902771,-0.031051636,0.00090026855,0.0020484924,0.006149292,-0.03173828,0.014305115,-0.017242432,-0.008148193,-0.014076233,0.01499176,-0.02810669,0.017410278,0.06719971,0.0113220215,-0.01689148,-0.0044555664,-0.023773193,0.020980835,0.040740967,-0.010665894,0.009223938,-0.042907715,0.020584106,-0.02835083,0.03591919,0.0026798248,0.035217285,-0.01586914,-0.02418518,-0.0026760101,-0.021270752,-0.011062622,-0.04046631,-0.013130188,-0.06329346,0.010520935,-0.017440796,-0.033081055,0.012466431,0.031463623,-0.012008667,-0.077941895,-0.010070801,0.05041504,0.0038585663,0.016342163,-0.0072898865,0.038360596,0.019943237,-0.029037476,-0.0029659271,0.00749588,-0.045410156,0.010383606,-0.02645874,0.009429932,-0.026031494,-0.012466431,0.007965088,-0.004600525,0.03225708,-0.0009007454,0.011787415,-0.02217102,0.010421753,-0.026412964,0.013366699,-0.010284424,-0.022140503,0.049041748,-0.02810669,0.03778076,0.041412354,0.023742676,0.0074882507,0.023864746,0.04449463,-0.034057617,-0.001294136,0.023025513,0.014724731,0.022872925,-0.0054016113,0.014053345,0.0149383545,0.015426636,-0.009216309,-0.008171082,0.012573242,-0.03552246,-0.00579834,0.031341553,-0.024810791,-0.021316528,-0.02482605,0.01285553,-0.0018787384,0.008880615,0.0069007874,-0.016342163,-0.016738892,-0.030456543,-0.0063323975,0.013618469,0.00258255,-0.016418457,0.024215698,0.004219055,0.017990112,0.009735107,-0.004070282,0.009109497,0.047698975,0.0073432922,-0.011268616,0.020462036,-0.0027046204,0.023712158,-0.0039749146,0.019714355,-0.055480957,-0.010101318,-0.014274597,-0.0021705627,-0.010826111,-0.017242432,-0.004333496,-0.018417358,-0.0023784637,-0.0067710876,-0.03390503,-0.02268982,-0.012184143,-0.02128601,-0.0209198,-0.007865906,0.0104904175,0.002090454,0.01171875,0.012870789,-0.01953125,0.017440796,-0.0027542114,-0.014038086,0.036590576,0.025253296,-0.007675171,-0.0317688,-0.0043640137,-0.028701782,-0.020446777,0.006248474,-0.026611328,-0.004638672,0.019622803,-0.0031490326,-0.0090789795,0.02848816,0.035736084,-0.02444458,0.019256592,-0.0059127808,0.028503418,-0.03186035,0.024658203,-0.036895752,0.03567505,0.008369446,0.01007843,0.006149292,-0.006542206,-0.029785156,0.026138306,0.021377563,-0.0151901245,0.0335083,0.020401001,0.03942871,-0.010017395,-0.0073127747,-0.0060195923,-0.01739502,-0.025466919,0.019180298,0.008796692,0.0033607483,0.004043579,-0.024032593,0.0006685257,-0.030151367,0.022109985,0.0038280487,0.014167786,-0.04156494,-0.034698486,-0.014205933,-0.020736694,-0.043029785,0.0067100525,-0.00749588,0.044067383,0.02458191,0.027435303,0.024963379,0.01461792,-0.0031604767,-0.028137207,-0.030578613,0.00077962875,-0.00068473816,0.009460449,-0.0020370483,0.046295166,0.058258057,0.00068950653,0.0418396,0.032958984,0.017318726,0.005039215,0.0012359619,-0.026184082,0.024871826,-0.006801605,0.014923096,0.008399963,0.029312134,-0.024765015,0.03869629,0.016113281,0.024124146,-0.042236328,0.03579712,0.080444336,0.019180298,-0.016189575,0.048583984,-0.0018568039,-0.021560669,-0.0071372986,-0.017425537,0.049804688,-0.0067214966,0.02798462,0.05456543,0.010444641,0.002216339,-0.0067329407,-0.018417358,-0.013793945,0.053985596,0.030807495,-0.00033020973,-0.0137786865,-0.01675415,0.012954712,-0.04156494,-0.041412354,-0.00060510635,-0.013542175,0.017028809,-0.0014600754,-0.00073575974,-0.029083252,0.005393982,0.017456055,0.008102417,-0.016159058,0.038360596,0.035949707,-0.011169434,0.017120361,-0.019210815,0.025787354,-0.0056762695,-0.029571533,0.032958984,0.023239136,0.0016355515,-0.025482178,0.022613525,-0.01701355,0.029876709,0.049102783,-0.024765015,0.011558533,0.032440186,-0.004550934,-0.01537323,0.038269043,0.036590576,0.013839722,0.045959473,0.034240723,0.031921387,-0.039978027,0.031311035,0.005924225,0.0033130646,-0.020187378,-0.0013799667,0.011993408,-0.01689148,0.02494812,-0.00047898293,-0.035247803,0.021530151,0.020355225,0.0045814514,-0.0047950745,0.002614975,0.021392822,-0.03652954,-0.017044067,0.006210327,0.0013113022,0.026229858,0.02355957,0.024841309,-0.013496399,0.028305054,0.008796692,-0.016036987,-0.019210815,0.01838684,-0.031311035,-0.008079529,-0.005672455,-0.009513855,-0.06185913,0.012916565,0.00793457,0.012931824,0.022262573,-0.009361267,-0.0049095154,0.006504059,0.019348145,0.0002503395,-0.00014424324,-0.00019478798,-0.02633667,0.020065308,0.038635254,-0.01260376,0.017456055,-0.0042915344,-0.0041007996,0.0039138794,-0.0014600754,-0.01878357,-0.015975952,-0.014717102,-0.022079468,0.01108551,0.020690918,0.008201599,0.0680542,-0.019577026,-0.03213501,0.0014638901,0.031097412,-0.0048713684,-0.0037193298,0.0015697479,-0.0014915466,-0.032196045,0.054229736,0.040405273,0.016021729,0.030929565,-0.0039787292,-0.032226562,-0.008300781,0.019332886,0.023910522,-0.008171082,-0.0030574799,-0.0005021095,0.04196167,-0.016479492,-0.041992188,-0.0014696121,-0.023101807,-0.04095459,-0.020263672,0.010650635,-0.0005297661,0.021850586,0.025482178,0.020217896,-0.031585693,0.05886841,-0.019729614,0.032440186,-0.011306763,-0.018463135,0.044799805,0.011329651,0.04058838,-0.003282547,-0.0045814514,-0.036376953,0.0054397583,0.024932861,0.013656616,0.027008057,-0.0032444,-0.016220093,0.016296387,-0.0011053085,0.021728516,-0.00017237663,0.00422287,0.017227173,-0.01651001,0.0015497208,-0.018249512,0.0034980774,0.006839752,0.030853271,-0.02027893,0.014640808,-0.028823853,0.0033893585,0.029785156,0.008171082,0.006969452,0.0013637543,-0.026885986,0.027191162,-0.019348145,-0.034729004,-0.011161804,0.016571045,-0.06866455,-0.01499176,0.009864807,0.0061569214,-0.009536743,0.053375244,0.010726929,-0.0021800995,0.015541077,0.027709961,-0.02230835,0.03503418,-0.017837524,0.04675293,0.033721924,0.016937256,-0.008102417,0.026412964,0.020050049,-0.009750366,0.022598267,0.042816162,-0.008377075,0.02142334,-0.010093689,0.0027427673,0.0140686035,0.00042510033,-0.01626587,0.005554199,-0.011672974,-0.0027122498,0.0016927719,0.019042969,-0.021057129,-0.011306763,-0.017349243,-0.009666443,0.008232117,0.04522705,0.031799316,-0.02748108,0.009262085,-0.0038719177,0.000053465366,-0.0076179504,-0.004749298,0.008666992,-0.035705566,0.0078048706,0.019485474,0.003660202,0.029403687,-0.031204224,-0.006122589,0.022750854,0.02658081,0.044677734,0.009895325,-0.000579834,0.017303467,-0.004535675,-0.009231567,-0.015602112,-0.0008339882,0.017440796,0.011817932,0.011131287,-0.019073486,0.020706177,-0.02468872,0.0068092346,0.018051147,0.0044670105,0.010047913,-0.012420654,-0.0030097961,0.008895874,0.027908325,-0.0056381226,-0.022064209,-0.004337311,0.009239197,0.076171875,-0.0007071495,0.013008118,0.030654907,0.018814087,0.017562866,0.044952393,0.016113281,0.028411865,0.023269653,-0.0059814453,0.0053634644,0.029037476,-0.0035095215,-0.023834229,0.022857666,-0.026657104,-0.018859863,0.021774292,0.034332275,0.0141067505,-0.03717041,-0.002254486,-0.020736694,-0.032806396,0.00055360794,-0.006877899,-0.0082473755,-0.0093688965,-0.006122589,0.0023975372,-0.012817383,-0.03149414,-0.019760132,0.0027046204,-0.0066337585,-0.05218506,-0.008651733,-0.028213501,0.016571045,-0.025421143,0.0018997192,0.00001168251,0.009262085,-0.0209198,-0.0061454773,-0.01802063,0.0060424805,0.023254395,0.015670776,0.023269653,-0.013954163,-0.018600464,-0.03189087,0.0019760132,-0.0013542175,0.03945923,-0.0178833,0.013343811,0.038726807,-0.017837524,-0.005832672,-0.004142761,-0.012588501,-0.022232056,-0.0006146431,-0.0129776,0.01574707,0.008804321,-0.0056381226,-0.0071525574,0.026641846,-0.0317688,-0.02885437,0.023086548,0.04147339,0.012069702,0.023147583,-0.009025574,0.0016183853,-0.03692627,0.00037145615,-0.01626587,0.004688263,0.0050811768,0.0037498474,0.0013713837,0.016036987,0.02267456,0.00032949448,0.0036315918,0.045166016,0.02331543,0.012084961,0.01852417,-0.012634277,0.0129470825,-0.03955078,-0.008781433,0.01600647,0.02444458,0.020843506,0.002588272,-0.020523071,-0.0085372925,-0.017364502,0.008674622,0.0063171387,-0.011230469,-0.05807495,-0.013839722,-0.022277832,0.016418457,0.0025634766,-0.0012683868,-0.009094238,0.010871887,-0.022216797,-0.027389526,-0.034484863,0.046813965,0.014518738,-0.02027893,-0.01083374,0.023498535,0.021255493,-0.023101807,-0.004623413,-0.057403564,-0.029510498,-0.004196167,-0.0059051514,0.017959595,-0.003194809,0.014175415,-0.009971619,-0.0069389343,-0.0052948,0.013282776,0.013793945,-0.020339966,-0.012016296,0.024612427,0.019851685,-0.0079956055,0.0206604,0.004650116,0.008666992,0.0035953522,-0.0013694763,0.004272461,-0.038360596,0.028656006,0.020126343,-0.002960205,0.031585693,-0.013496399,0.017089844,-0.017166138,0.02420044,-0.005012512,-0.014862061,0.033569336,-0.036102295,-0.013755798,-0.003288269,-0.012573242,-0.020629883,0.01399231,0.013938904,0.017745972,-0.01625061,0.044921875,0.001121521,-0.021713257,0.025283813,0.01727295,-0.017471313,-0.00042915344,0.018005371,-0.0054512024,0.004764557,-0.01146698,-0.015403748,-0.01838684,-0.029312134,-0.0008535385,-0.008239746,-0.0021877289,0.021865845,0.013206482,0.03717041,0.006011963,0.015464783,0.020019531,0.01586914,0.025283813,-0.0012712479,0.04373169,0.003047943,-0.026733398,0.020935059,0.0042915344,-0.017974854,-0.0023403168,-0.0025310516,0.017807007,-0.023635864,0.0017633438,0.011146545,0.022125244,0.011161804,0.014427185,-0.008422852,-0.0038776398,-0.042816162,-0.020904541,-0.013389587,0.0011730194,0.033172607,0.006046295,0.026031494,0.0015325546,-0.018493652,0.017044067,0.035369873,-0.0061836243,-0.0211792,-0.00705719,0.018585205,-0.0012769699,0.02758789,0.0063171387,-0.006778717,-0.0158844,-0.005844116,-0.01574707,0.010864258,-0.012321472,0.008224487,-0.0035171509,-0.009933472,-0.029251099,0.030197144,-0.009590149,-0.019989014,0.008712769,0.005092621,0.031951904,0.015365601,-0.023162842,0.011543274,0.022415161,-0.034454346,0.055755615,0.028060913,0.00806427,0.003501892,-0.0042419434,-0.04196167,-0.021194458,-0.014755249,-0.016494751],"createdAt":"2026-04-18T18:52:59.008Z","updatedAt":"2026-04-27T21:34:09.885Z","lastSeenAt":"2026-04-27T21:34:09.885Z","tsv":"'/api/v1/portfolios/5/transactions':47 '/request':14,28 '0.02':13,27,76,130 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x8335':124 '1':95 '20':118 '2913':125 '300':144 '5':213 '6':134 'Base network API' 'USDC micropayment API' 'accept':196 'access':37 'address':140 'ai/ml':66 'amount':113 'analyt':65 'api':62,164 'application/json':153 'avail':229 'base':9,23,85,120,127 'base-network' 'bodi':222 'broader':53 'call':4,18,61,116 'caller':98 'connect':172 'contain':106 'content':178 'creat':206 'crypto payment API' 'data':41,64,69 'decim':135 'descript':189 'doc':162 'document':154 'dozen':56 'enabl':32 'endpoint':7,21,33,88,195,200 'equal':129 'exact':96,216 'exampl':186 'extrem':159 'field':192,223 'finance/web3':68 'given':131 'header':105 'id':212 'includ':100 'infer':67 'infrastructur':71 'json-response' 'lowpaymentfee' 'lowpaymentfee.com':35 'materi':230 'maximum':112 'mime':150 'must':99 'name':201 'network':86 'no-api-key' 'offer':55 'openapi':182 'page':167 'part':50 'pay':2,16,59 'pay-per-cal':1,15,58 'pay-per-call' 'pay-per-request endpoint' 'payment':92,104,109,136 'per':3,17,60,77,115 'platform':54 'portfolio':5,19,39,211 'portfolio transactions API' 'portfolio-transactions' 'post':44 'price':74,163 'prompt':174 'proof':110 'protocol':93 'provid':36 'read':218 'readm':166 'render':169 'request':45,78 'request/response':185 'requir':114,221 'respons':149,224 'retriev':204 'return':198 'schema':183 'scheme':97 'second':145 'semant':217 'sent':138 'settl':80 'shape':225 'site':157 'span':63 'specif':210 'suggest':202 'thin':160 'timeout':146 'transact':6,20,40,194,207 'type':151 'unit':121 'unknown':227 'usdc':12,26,82,123,132 'usdc-settlement' 'use':89 'util':72 'valid':108 'version':94 'via':10,24,42 'vs':219 'wallet':173 'window':147 'write':220 'x':103 'x-payment':102 'x402':11,25,31,91 'x402 paid API' 'x402-enabled':30 'x402-payment'","prices":[{"id":"6a9ccec7-01db-42e7-b6fb-7a0a280a595d","listingId":"122b41db-12a2-4d76-a24b-f24039c6b06a","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/portfolios/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":"2026-04-18T18:52:59.008Z"}],"sources":[{"listingId":"122b41db-12a2-4d76-a24b-f24039c6b06a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/5/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:59.008Z","lastSeenAt":"2026-04-27T21:34:09.885Z"}],"details":{"listingId":"122b41db-12a2-4d76-a24b-f24039c6b06a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/5/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/5/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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/5/transactions"}],"useCases":["Retrieving or submitting portfolio transaction records via a single paid API call","Integrating pay-per-use financial data into agent workflows without API key management","Programmatic access to portfolio data settled on-chain via USDC on Base"],"bestFor":["Agents or developers wanting keyless, pay-per-call access to portfolio transaction data","x402-compatible clients that can construct USDC payment proofs on Base","Low-volume or sporadic usage where $0.02/request flat pricing is attractive"],"notFor":["Users who need detailed API documentation or schema validation before integrating","High-volume bulk data retrieval where per-request pricing would be costly","Anyone without a Base-network USDC wallet or x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.706Z"},"updatedAt":"2026-04-27T21:34:09.885Z"}}