{"id":"46352647-ce31-47e3-b151-25572738bb27","shortId":"3Y63bM","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via the x402 payment protocol. The specific resource `/api/v1/portfolios/63/transactions` accepts POST requests and charges up to $0.02 per call in USDC on the Base network. Payment is handled inline via the x402 challenge-response mechanism — no API keys, accounts, or rate limits are required.\n\nThe parent site lowpaymentfee.com hosts a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, the specific endpoint being listed here targets portfolio transactions (portfolio ID 63). No further documentation is available describing the request body schema, response format, or the nature of the portfolio data returned. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional technical content.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation beyond the landing page listing, the exact capabilities and data format of this endpoint remain unclear. Agents calling this endpoint should be prepared to experiment with POST payloads and interpret the response structure at runtime.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-transactions","post-method"],"categories":["finance"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","lowpaymentfee portfolio","Base network API","crypto portfolio data"],"warnings":["No API documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no technical content.","No request body schema or response schema documented; callers must guess the POST payload format.","The endpoint targets a hardcoded portfolio ID (63) with no explanation of what this portfolio represents.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/63/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/63/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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of portfolio 63 is unexplained. 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":"2026-04-19T08:47:19.745Z","embedding":[-0.013755798,-0.013671875,0.03515625,-0.0016870499,0.01713562,-0.023635864,-0.02897644,0.0055389404,0.07067871,-0.056793213,0.027008057,-0.042510986,-0.04473877,-0.040863037,-0.006210327,-0.008422852,0.02053833,0.013542175,-0.047851562,0.045013428,0.033294678,-0.03967285,-0.013961792,0.0037269592,-0.020950317,0.0025539398,-0.008666992,-0.013679504,-0.041870117,-0.03024292,0.0463562,-0.022445679,-0.00017678738,0.0070343018,-0.037078857,0.0099105835,-0.0011692047,0.04421997,0.035614014,-0.0031204224,0.029296875,-0.04473877,0.010810852,-0.019195557,-0.016525269,0.0043525696,0.016799927,-0.053527832,0.03805542,0.008636475,-0.034698486,-0.016479492,0.0065078735,0.037109375,0.01713562,0.015434265,0.030853271,-0.014144897,0.008132935,0.029891968,-0.0032863617,-0.05303955,0.00894928,0.0046310425,0.0009841919,0.04196167,-0.031707764,0.060150146,-0.016189575,0.085754395,0.014160156,0.032562256,0.01474762,0.020080566,-0.0002939701,-0.020141602,-0.0234375,0.039733887,-0.007255554,-0.0496521,-0.00070905685,-0.0003156662,-0.06488037,-0.0082473755,-0.022247314,-0.048461914,-0.008804321,0.007865906,-0.039855957,0.02645874,-0.08239746,0.003419876,0.000055789948,0.026794434,-0.030593872,-0.016784668,0.0021762848,0.020584106,-0.0067863464,0.027435303,0.02470398,-0.027038574,0.021514893,0.017852783,0.040496826,0.016403198,0.012931824,0.05819702,-0.017974854,-0.017715454,-0.051971436,-0.0012397766,-0.01625061,0.018829346,0.0055351257,-0.017501831,-0.019897461,0.02229309,-0.013847351,0.019226074,-0.055236816,0.020874023,0.014694214,-0.009094238,0.014945984,-0.04208374,-0.022064209,0.0031757355,-0.035064697,-0.021820068,0.018051147,-0.008575439,-0.012481689,-0.020996094,-0.016906738,0.0049743652,-0.029144287,-0.0077056885,-0.05807495,-0.01399231,0.033447266,-0.03857422,0.03237915,0.01222229,-0.09838867,0.02671814,-0.0084991455,0.04763794,-0.025115967,0.003993988,0.016174316,0.020355225,-0.0105896,-0.0022411346,0.0009255409,-0.042266846,-0.0072288513,0.025115967,0.0042266846,0.037628174,-0.005619049,0.027770996,0.013298035,0.004737854,0.020248413,0.02406311,-0.0014381409,-0.046905518,-0.07092285,-0.011123657,0.023788452,-0.029953003,-0.018463135,0.001821518,-0.01083374,-0.09234619,-0.028121948,-0.01448822,0.011375427,-0.031433105,-0.016357422,-0.031555176,0.010284424,-0.0084991455,-0.06188965,0.003452301,-0.031143188,0.05392456,0.015449524,0.030441284,0.0423584,0.018066406,0.044067383,0.043518066,-0.019744873,-0.029815674,0.00035977364,-0.006290436,0.017410278,-0.0040016174,0.024871826,-0.02519226,0.028121948,0.06188965,-0.01890564,-0.016952515,0.015625,-0.05807495,-0.032989502,-0.025787354,0.038604736,-0.00047779083,-0.028213501,0.023620605,-0.010612488,-0.031799316,0.0074424744,0.027145386,0.011619568,0.05819702,-0.0014781952,0.022125244,0.028213501,-0.0030345917,-0.020523071,0.049987793,0.027694702,-0.0009822845,-0.009231567,-0.069885254,0.03149414,0.0368042,-0.01448822,-0.011497498,0.0045547485,-0.0038814545,-0.03189087,-0.016067505,0.019378662,-0.022613525,-0.004722595,-0.031707764,-0.009010315,0.016540527,-0.0009775162,0.0014791489,-0.030395508,-0.08843994,0.032714844,0.047546387,0.03289795,-0.007987976,-0.0131073,-0.017150879,-0.002090454,-0.04675293,0.037750244,0.045043945,-0.017929077,-0.017791748,0.030853271,-0.019592285,-0.014572144,-0.011741638,-0.036132812,-0.012321472,-0.01965332,-0.018814087,-0.06402588,0.029327393,0.02218628,0.025421143,0.019302368,-0.005001068,-0.08227539,-0.0025119781,-0.014732361,0.006916046,-0.037109375,-0.029327393,0.021591187,0.01777649,-0.010902405,0.031082153,0.011756897,0.00137043,0.012802124,0.021743774,0.010246277,0.00096559525,-0.014343262,0.030044556,0.011016846,-0.057434082,0.013206482,-0.001709938,0.03466797,-0.042633057,0.029800415,-0.020767212,0.010070801,0.023422241,-0.022155762,-0.06518555,0.011489868,0.008834839,0.024734497,0.034088135,-0.010536194,-0.002254486,-0.03475952,0.056640625,-0.009124756,-0.0096588135,0.010002136,0.030700684,0.035064697,-0.012290955,-0.053741455,-0.018463135,-0.0013856888,-0.032073975,0.036621094,-0.0013284683,0.013069153,-0.0008997917,0.010734558,-0.021087646,-0.00970459,-0.024795532,-0.007873535,-0.03201294,0.0011587143,-0.009307861,-0.011917114,0.020751953,-0.00233078,0.0074310303,0.009407043,0.030197144,0.010818481,0.007205963,-0.021728516,-0.027359009,0.007205963,-0.021408081,0.032104492,0.04827881,0.008880615,0.009895325,-0.019104004,-0.015731812,0.027511597,0.010322571,0.033966064,0.0031108856,-0.004119873,-0.060394287,-0.06762695,-0.0236969,-0.020019531,0.019592285,0.031982422,-0.002571106,0.034973145,0.034484863,-0.0064735413,-0.047058105,0.05319214,-0.035369873,0.025787354,0.03286743,-0.020507812,-0.022521973,0.009246826,0.015716553,0.0005393028,0.04244995,0.011299133,0.015563965,0.036499023,0.027511597,0.023757935,0.0047798157,0.014984131,0.0178833,-0.0030174255,0.0010757446,-0.032196045,-0.017120361,0.0059127808,-0.01789856,-0.025009155,-0.070739746,0.03237915,0.027938843,0.09362793,0.03201294,0.018081665,-0.002658844,-0.02911377,0.0003914833,-0.03591919,-0.014160156,-0.03793335,-0.033721924,0.023162842,0.0064353943,0.028518677,-0.04168701,0.038848877,-0.01651001,0.009086609,-0.025405884,0.061798096,-0.018035889,-0.014839172,-0.0014190674,0.023513794,0.04525757,0.064208984,-0.015327454,0.032043457,0.03552246,-0.025115967,0.014762878,0.035583496,-0.015197754,-0.023345947,-0.051574707,-0.037200928,0.002023697,-0.018508911,-0.016418457,-0.0021305084,0.011558533,0.04168701,0.0012989044,-0.007888794,-0.020904541,0.021606445,0.017196655,-0.032836914,-0.0016822815,-0.04248047,0.009056091,0.053131104,-0.0075569153,-0.008354187,-0.010597229,-0.021316528,0.03237915,0.022079468,0.002752304,-0.008216858,-0.0131073,0.03933716,-0.009269714,0.01626587,0.019729614,0.042877197,0.034301758,0.016998291,0.042388916,0.011543274,-0.014595032,-0.04711914,-0.006175995,-0.06488037,-0.0042495728,0.03540039,-0.015899658,-0.0021076202,-0.0143585205,-0.030380249,0.013717651,0.027770996,-0.026062012,-0.0002772808,0.0104522705,-0.008811951,-0.03604126,-0.059295654,-0.025115967,0.0211792,0.083740234,0.026947021,0.004432678,-0.028823853,-0.003129959,0.040863037,-0.008140564,0.033294678,-0.013656616,-0.02357483,-0.018585205,-0.03945923,-0.028060913,-0.013031006,0.029541016,0.017791748,-0.018966675,0.018417358,-0.007888794,0.0099105835,0.003753662,-0.017501831,0.0044441223,0.0016260147,0.021133423,0.001543045,0.0546875,0.0032100677,-0.041503906,-0.05596924,0.018692017,-0.020629883,0.031677246,-0.03930664,-0.027709961,0.01687622,0.006149292,-0.022064209,-0.045776367,0.003025055,0.007091522,-0.03842163,-0.0848999,0.043792725,-0.01713562,0.007881165,0.013580322,0.0027809143,0.019897461,-0.006679535,0.021072388,-0.0031833649,-0.020751953,-0.042663574,-0.04144287,-0.032165527,-0.044525146,-0.01574707,-0.03237915,0.029525757,-0.028640747,0.037017822,-0.018615723,-0.042419434,0.042785645,0.02784729,0.01890564,0.024017334,-0.006038666,0.0046958923,0.040374756,-0.0033016205,-0.029953003,0.022064209,0.007080078,-0.0058174133,0.013130188,0.046020508,-0.00072431564,-0.011268616,0.029876709,-0.0026474,-0.017684937,-0.04095459,-0.016906738,0.0020828247,0.022506714,-0.006965637,-0.0259552,0.03086853,0.02557373,-0.04269409,-0.05508423,0.017196655,0.016693115,-0.035491943,0.019012451,0.013969421,0.027236938,-0.03225708,0.025680542,0.0075187683,0.046173096,0.02734375,0.00020694733,-0.002008438,0.011238098,-0.007385254,0.000048160553,0.008010864,-0.0073547363,0.0067367554,0.0040130615,0.02746582,0.007118225,0.016357422,-0.015823364,-0.03845215,0.00982666,-0.013557434,-0.017211914,0.025894165,-0.007724762,0.032043457,0.008705139,0.026306152,0.03845215,-0.010223389,-0.012878418,-0.018539429,0.019515991,0.012138367,0.020889282,0.0046844482,0.0024414062,0.029769897,-0.056640625,-0.010177612,0.021057129,0.016159058,0.0065841675,-0.05291748,-0.046966553,-0.00032687187,0.033843994,0.004497528,-0.00027012825,0.0211792,0.008781433,-0.013648987,-0.017333984,0.0017538071,0.0011787415,-0.027145386,-0.061035156,-0.016906738,0.008003235,0.004863739,-0.014823914,0.025238037,-0.039489746,-0.025512695,0.008071899,-0.042144775,-0.0026111603,-0.009307861,0.00020062923,0.021530151,0.0035705566,0.0124435425,-0.011436462,-0.059387207,0.016693115,-0.015312195,0.074523926,-0.040893555,0.027893066,-0.003534317,-0.015151978,0.00095939636,0.017456055,0.015510559,0.044006348,0.008735657,0.051818848,-0.031051636,0.05783081,-0.012413025,0.012611389,0.0044555664,-0.042541504,-0.015388489,-0.019424438,-0.015235901,0.045043945,-0.023208618,-0.0104599,-0.038879395,-0.01586914,-0.0079193115,-0.043762207,0.017868042,0.014022827,0.046844482,-0.02909851,-0.001367569,-0.0006761551,0.017608643,0.00012779236,-0.033843994,-0.009101868,-0.0013904572,0.014282227,0.011878967,-0.021270752,-0.0061683655,-0.00819397,0.0022716522,-0.05529785,-0.03778076,0.0050354004,-0.0004863739,-0.018188477,0.015670776,-0.016647339,-0.012992859,-0.00440979,-0.049591064,-0.00617218,-0.0036716461,0.021972656,-0.00037169456,-0.012313843,-0.014297485,0.010299683,-0.020431519,0.021606445,-0.0063209534,-0.022201538,-0.052124023,0.013145447,-0.00881958,0.02960205,-0.017486572,-0.02859497,0.0063972473,-0.020355225,-0.058502197,-0.0064964294,0.008468628,-0.02331543,0.011482239,-0.02168274,-0.026062012,0.0017633438,-0.042633057,-0.020996094,0.005130768,-0.013473511,0.013168335,-0.01777649,0.024810791,0.035858154,-0.014923096,-0.031280518,-0.0012807846,0.008850098,0.009613037,0.02178955,0.037322998,-0.020706177,-0.027069092,-0.011360168,-0.011528015,-0.00819397,-0.041503906,0.018463135,-0.005859375,-0.00015616417,-0.007411957,0.012908936,-0.02645874,0.015434265,0.05117798,0.0028305054,-0.0039634705,0.0026893616,-0.014556885,0.012916565,0.04043579,-0.012382507,0.012397766,-0.045684814,0.019592285,-0.019119263,0.05429077,0.006565094,0.014976501,-0.008712769,-0.01751709,0.00969696,0.0060310364,0.00522995,-0.028625488,-0.017227173,-0.058776855,0.003862381,-0.02583313,-0.038024902,0.014099121,0.020828247,-0.015975952,-0.067871094,-0.0082473755,0.04800415,0.0018997192,0.021514893,-0.006088257,0.044799805,0.030197144,-0.00008195639,-0.010559082,0.0005569458,-0.050628662,0.008338928,-0.033355713,0.020767212,-0.03173828,-0.01625061,0.0024700165,-0.015655518,0.021316528,-0.0021858215,0.029266357,-0.014472961,0.009414673,-0.019088745,0.01285553,-0.014419556,-0.024719238,0.0446167,-0.025741577,0.04623413,0.030593872,0.02734375,0.0046157837,0.021118164,0.030776978,-0.041107178,0.011039734,0.039154053,0.016937256,0.022964478,-0.01423645,0.023162842,0.031204224,0.018096924,-0.010940552,-0.021697998,0.0016460419,-0.03012085,-0.009674072,0.030426025,-0.0231781,-0.02116394,-0.03768921,0.010147095,0.017944336,0.01612854,-0.0031642914,-0.020477295,-0.013397217,-0.025115967,0.00712204,0.00013124943,0.011627197,-0.011634827,0.016357422,-0.004550934,0.01763916,-0.010040283,-0.00907135,0.017318726,0.03604126,0.008735657,-0.0008568764,0.01637268,0.0043182373,0.022659302,0.0021247864,0.03012085,-0.043640137,-0.026062012,-0.005672455,0.000620842,-0.007801056,-0.018325806,0.003370285,-0.007865906,-0.0065841675,-0.021438599,-0.03527832,-0.021331787,-0.012001038,-0.01928711,-0.018112183,-0.009025574,0.0046920776,0.02267456,0.010635376,0.0052452087,-0.030654907,0.018096924,-0.003955841,-0.00944519,0.022888184,0.027770996,-0.022598267,-0.042053223,0.0032539368,-0.02571106,-0.02758789,0.010284424,-0.0107803345,-0.0020256042,0.0121154785,0.012916565,-0.012771606,0.023101807,0.02909851,-0.016921997,0.018966675,0.00982666,0.012107849,-0.036376953,0.024841309,-0.049346924,0.03982544,0.010696411,0.020523071,0.009407043,-0.015411377,-0.026641846,0.029571533,0.020935059,-0.012710571,0.03817749,0.0041618347,0.04547119,0.0004339218,0.00047659874,-0.0036716461,-0.020187378,-0.016067505,0.013946533,0.016143799,0.0045661926,0.0028038025,-0.016296387,-0.0052604675,-0.035064697,0.012145996,0.013458252,0.019836426,-0.04385376,-0.04156494,-0.0028381348,-0.014160156,-0.041503906,0.01486969,0.0033359528,0.040283203,0.04336548,0.022872925,0.010314941,0.011756897,-0.00091552734,-0.033721924,-0.02357483,-0.0012197495,0.0030384064,0.021850586,-0.017349243,0.04119873,0.06335449,-0.00016081333,0.03955078,0.042938232,0.012084961,0.003583908,0.0066986084,-0.027862549,0.032592773,-0.009643555,0.005493164,0.008880615,0.03604126,-0.021026611,0.022567749,-0.0063591003,0.026565552,-0.03567505,0.01637268,0.088012695,0.025161743,-0.0076179504,0.05291748,-0.008216858,-0.022735596,-0.016998291,-0.008926392,0.05444336,-0.016479492,0.035369873,0.027359009,0.015022278,-0.006061554,-0.009391785,-0.0025520325,-0.02583313,0.038269043,0.030929565,0.0040740967,-0.0019159317,-0.0262146,0.009002686,-0.03237915,-0.03024292,0.003276825,-0.00023508072,0.021530151,0.002521515,0.0015382767,-0.015541077,-0.0029907227,0.00020480156,0.00044870377,-0.021697998,0.027267456,0.031311035,0.005176544,0.022125244,-0.008460999,0.024353027,0.0008878708,-0.016921997,0.026184082,0.028213501,0.006298065,-0.017425537,0.033355713,0.0035514832,0.02897644,0.052734375,-0.021530151,-0.00029730797,0.028747559,-0.0052223206,-0.013267517,0.02520752,0.022583008,0.012649536,0.042663574,0.04260254,0.026565552,-0.02267456,0.0181427,-0.012306213,0.0061912537,-0.011375427,-0.0043563843,0.018249512,-0.014297485,0.016677856,-0.0039863586,-0.042541504,0.036468506,0.014549255,0.0021209717,-0.0058784485,-0.00050497055,0.022232056,-0.018539429,-0.013473511,-0.00034213066,0.005508423,0.022079468,0.03173828,0.035980225,-0.013343811,0.03363037,0.010597229,-0.013381958,-0.017654419,0.009338379,-0.032287598,-0.006252289,-0.010284424,-0.013366699,-0.053222656,0.007522583,-0.000029861927,0.005355835,0.0206604,-0.015487671,-0.010971069,0.003686905,0.016418457,0.01713562,-0.013572693,-0.007865906,-0.008628845,0.012107849,0.032104492,-0.01448822,0.01109314,-0.0064582825,-0.01171875,0.006996155,-0.000395298,-0.023727417,-0.014907837,0.0028591156,-0.020690918,0.009407043,0.029800415,0.016082764,0.068847656,-0.015396118,-0.01914978,-0.011367798,0.029876709,0.00019729137,-0.010688782,-0.0058250427,-0.0026493073,-0.03125,0.036499023,0.033813477,0.00274086,0.016967773,-0.013969421,-0.019500732,-0.01637268,0.00014746189,0.013145447,-0.003320694,-0.008735657,-0.0045204163,0.025360107,-0.03225708,-0.039093018,-0.006378174,-0.021972656,-0.033447266,-0.029464722,0.016189575,-0.0021247864,0.01852417,0.022537231,0.025939941,-0.011886597,0.061187744,-0.017059326,0.027542114,-0.017623901,0.002210617,0.06149292,0.017349243,0.040374756,-0.01171875,-0.009895325,-0.032714844,-0.006000519,0.022506714,0.015510559,0.028717041,-0.0012788773,-0.009994507,0.018417358,-0.007381439,0.016021729,-0.0010128021,0.0036773682,0.014511108,-0.020828247,0.00020718575,-0.009117126,0.0151901245,0.0146484375,0.03314209,-0.010536194,0.022140503,-0.035369873,-0.007965088,0.026870728,0.019897461,0.0060577393,0.0008597374,-0.021270752,0.03253174,-0.016143799,-0.030227661,-0.0021762848,0.017425537,-0.07922363,-0.023162842,0.010528564,0.0118255615,-0.020370483,0.04586792,0.012557983,-0.0028076172,0.024383545,0.033050537,-0.011543274,0.047851562,-0.00040960312,0.050750732,0.039154053,0.0052604675,-0.020599365,0.02281189,0.02192688,-0.01763916,0.023498535,0.051727295,0.00217247,0.026031494,-0.009994507,-0.0010051727,0.0038909912,0.014549255,-0.019607544,0.0037879944,-0.0071792603,-0.010391235,0.006641388,0.017440796,-0.013435364,-0.017959595,0.00016391277,-0.008239746,-0.0013494492,0.04928589,0.028289795,-0.03604126,0.013694763,-0.0034427643,0.0025081635,-0.003967285,-0.010536194,-0.00011062622,-0.044036865,-0.0006518364,0.024765015,-0.0036964417,0.029373169,-0.033416748,0.0009822845,0.033111572,0.025512695,0.046691895,0.020355225,-0.007827759,0.031051636,-0.0016851425,0.002840042,-0.013946533,-0.0029010773,0.012321472,0.0019989014,0.018203735,-0.020584106,0.013435364,-0.025604248,-0.0014829636,0.0126571655,0.007949829,0.013618469,-0.014373779,-0.008255005,0.020065308,0.025939941,-0.0138549805,-0.032989502,-0.0047569275,0.01448822,0.07354736,-0.0026569366,0.009849548,0.017608643,0.03463745,0.017608643,0.04840088,0.020629883,0.021728516,0.025543213,-0.0073051453,-0.0014972687,0.051483154,-0.012527466,-0.026290894,0.032165527,-0.026412964,-0.031082153,0.031585693,0.021728516,0.018157959,-0.037872314,-0.0060806274,-0.029464722,-0.04043579,0.004211426,-0.015098572,0.0019378662,-0.006313324,-0.013580322,0.020980835,-0.007205963,-0.00944519,-0.022216797,0.0028705597,-0.0126953125,-0.05819702,-0.005771637,-0.0206604,-0.0025138855,-0.03189087,0.010055542,0.0017185211,0.016296387,-0.010681152,-0.0022602081,-0.008270264,0.012748718,0.01725769,0.02571106,0.019134521,-0.0076675415,-0.02909851,-0.017288208,-0.0034675598,-0.0049705505,0.04156494,-0.029525757,0.0068473816,0.028442383,-0.011489868,-0.0024223328,-0.0012388229,-0.021255493,-0.013931274,-0.02571106,-0.0056991577,0.010612488,0.031555176,0.0034618378,-0.007980347,0.031982422,-0.017410278,-0.024627686,0.019729614,0.044006348,0.015914917,0.025344849,-0.0095825195,0.0011835098,-0.048065186,-0.000094652176,-0.006942749,0.0010671616,0.020431519,0.0024929047,0.0057029724,0.020065308,0.008453369,-0.008056641,0.0061836243,0.0501709,0.020614624,0.0110321045,0.029647827,-0.009750366,0.0049209595,-0.034942627,-0.016784668,0.023468018,0.04562378,0.023071289,0.011436462,-0.0231781,-0.013084412,-0.0052719116,0.0118637085,0.015991211,-0.0040130615,-0.044189453,-0.0178833,-0.012382507,0.016647339,-0.0022583008,0.003047943,-0.0025978088,0.003780365,-0.022781372,-0.011306763,-0.040222168,0.039215088,-0.0025463104,-0.032989502,-0.0023422241,0.018707275,0.014419556,-0.020904541,0.0018339157,-0.05822754,-0.0071372986,-0.022384644,-0.01184845,0.013298035,-0.006504059,0.017318726,-0.020584106,0.000099658966,-0.014030457,0.017684937,0.015434265,-0.032287598,-0.008033752,0.022491455,0.025115967,-0.012916565,0.021896362,0.010238647,0.00046396255,-0.0015115738,0.0017356873,0.0039978027,-0.026611328,0.030700684,0.019699097,-0.0062942505,0.028045654,-0.020843506,0.034423828,-0.011558533,0.01449585,-0.026062012,-0.0018949509,0.03225708,-0.025482178,-0.016647339,-0.0028095245,-0.004638672,-0.02734375,0.011123657,0.019515991,0.011405945,-0.02758789,0.0463562,-0.0013847351,-0.01965332,0.020355225,0.023849487,-0.016571045,0.0029354095,0.023788452,-0.011581421,0.0053710938,-0.015472412,-0.017105103,-0.018112183,-0.03237915,-0.011390686,-0.014160156,0.010986328,0.018875122,0.021133423,0.04006958,0.008659363,0.015731812,0.033050537,0.009185791,0.026885986,0.0069618225,0.04510498,0.0178833,-0.017684937,0.0068588257,0.0055656433,-0.0068588257,0.0023612976,-0.0009531975,0.02041626,-0.018920898,0.00030970573,0.014694214,0.023864746,0.019088745,0.017166138,-0.0046958923,-0.003320694,-0.041625977,-0.012275696,-0.01727295,0.00047016144,0.03237915,0.017990112,0.017974854,0.00655365,-0.01852417,0.01486969,0.025283813,-0.008529663,-0.015472412,-0.004295349,0.014549255,0.004398346,0.015060425,0.016174316,-0.0048980713,-0.017349243,-0.0007009506,-0.012329102,0.016738892,-0.0054473877,0.010368347,0.012268066,-0.009529114,-0.028121948,0.027297974,-0.016021729,-0.015777588,0.014259338,0.00091791153,0.02470398,0.009895325,-0.021560669,0.009269714,0.02897644,-0.037353516,0.04638672,0.013893127,0.0023212433,-0.0036830902,-0.013946533,-0.037322998,0.003627777,-0.0035552979,-0.0077552795],"createdAt":"2026-04-18T18:53:11.511Z","updatedAt":"2026-04-28T05:34:37.679Z","lastSeenAt":"2026-04-28T05:34:37.679Z","tsv":"'/api/v1/portfolios/63/transactions':47 '0.02':55,111 '63':126 'Base network API' 'USDC pay-per-call API' 'accept':48 'access':34 'account':78 'addit':165 'agent':196 'ai/ml':101 'analyt':100 'api':76,97,151 'avail':131 'base':8,22,62 'beyond':180 'bodi':135 'broad':90 'call':12,26,57,197 'capabl':187 'catalog':91 'challeng':72 'challenge-respons':71 'charg':52 'connect':160 'content':167 'crypto portfolio data' 'data':38,99,104,145,189 'describ':132 'doc':148 'document':129,179 'endpoint':6,20,30,117,193,199 'exact':186 'exampl':176 'experi':204 'finance/web3':103 'format':138,190 'gate':3,17 'handl':66 'host':88 'howev':114 'id':125 'infer':102 'inlin':67 'interpret':209 'key':77 'land':182 'limit':81 'list':119,184 'lowpaymentfee portfolio' 'lowpaymentfee.com':32,87 'mechan':74 'natur':141 'network':63 'openapi':172 'page':152,183 'parent':85 'pay':10,24,94 'pay-per-cal':9,23 'pay-per-request':93 'payload':207 'payment':42,64 'per':11,25,56,95,112 'portfolio':4,18,36,122,124,144 'portfolio transactions API' 'portfolio-transactions' 'post':49,206 'post-method' 'prepar':202 'price':109,149 'prompt':162 'protocol':43 'provid':33 'rate':80 'remain':194 'render':157 'request':50,96,113,134 'request/response':175 'requir':83 'resourc':46 'respons':73,137,211 'return':146 'runtim':214 'schema':136 'servic':107 'site':86,155 'span':98 'spec':173 'specif':45,116 'structur':212 'target':121 'technic':166 'transact':5,19,37,123 'unclear':195 'usdc':14,28,59 'usdc-base' 'util':106 'via':39,68 'wallet':161 'x402':2,16,41,70 'x402 finance endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c348c8e7-d550-431b-bcc6-26b78a92b1fd","listingId":"46352647-ce31-47e3-b151-25572738bb27","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/63/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":"2026-04-18T18:53:11.511Z"}],"sources":[{"listingId":"46352647-ce31-47e3-b151-25572738bb27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/63/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:11.511Z","lastSeenAt":"2026-04-28T05:34:37.679Z"}],"details":{"listingId":"46352647-ce31-47e3-b151-25572738bb27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/63/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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/63/transactions"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/63/transactions"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site hosts APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction history for a specific portfolio","Programmatic access to portfolio transaction records without API key management","Agent-driven financial data retrieval with inline micropayments"],"bestFor":["Agents needing keyless, pay-per-call access to portfolio transaction data","Developers experimenting with x402 payment-gated APIs on Base","Automated workflows that need on-demand financial transaction records"],"notFor":["Users who need detailed API documentation or guaranteed schema stability","Bulk data export of large transaction histories (no batch endpoint documented)","Anyone needing free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.108Z"},"updatedAt":"2026-04-28T05:34:37.679Z"}}