{"id":"4338ffb2-2029-4d3e-bb2f-8974c3e3591c","shortId":"dFR6Ym","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (portfolio ID 2) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call. This particular endpoint sits in the finance category and appears to deliver performance metrics for a pre-defined portfolio. No OpenAPI schema, request body documentation, or response examples were found in the crawl; the docs, pricing, and API pages all returned only a \"Connect wallet\" stub. The exact fields returned by the performance endpoint are unknown.\n\nBecause there is no published schema or documentation beyond the landing page listing, agents should treat this as a lightly-documented endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational and ready to accept payments.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base","micropayment","json-response","post-method"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio returns","portfolio analytics","finance API","x402 finance","Base USDC API"],"warnings":["No OpenAPI or request/response schema available — input and output formats are unknown.","Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' stub with no useful content.","Endpoint is specific to portfolio ID 2; it is unclear whether other portfolio IDs are available or what data this portfolio represents.","No rate limit or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/2/performance","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/2/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, and no examples. The docs pages are empty stubs. The purpose of the endpoint is only inferable from the URL path.","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":"2026-04-19T08:20:56.112Z","embedding":[-0.008216858,-0.015235901,0.033233643,0.023635864,0.019012451,-0.0065841675,-0.03668213,-0.0062332153,0.08081055,-0.03274536,0.018920898,-0.048828125,-0.028564453,-0.04977417,0.0028018951,0.0061302185,0.029953003,-0.01210022,-0.03778076,0.055725098,0.038116455,-0.02128601,-0.014251709,0.010322571,-0.008415222,0.0017232895,-0.009391785,-0.005607605,-0.025009155,-0.032806396,0.0289917,-0.020446777,-0.017410278,0.0016212463,-0.028915405,-0.0025939941,0.0074768066,0.026428223,0.020874023,-0.003921509,-0.0070114136,-0.051361084,0.023239136,-0.008758545,-0.034576416,-0.012191772,0.03250122,-0.054229736,0.039886475,0.01399231,-0.033569336,-0.0013313293,-0.0155181885,0.02659607,0.024719238,0.027420044,0.032592773,-0.0018606186,0.000056624413,0.016021729,0.01134491,-0.04925537,0.018829346,0.0024356842,0.0045776367,0.035217285,-0.025756836,0.066589355,-0.008666992,0.074279785,0.029251099,0.04333496,0.029800415,0.016601562,-0.010055542,-0.022109985,-0.009048462,0.037994385,-0.004852295,-0.031677246,-0.008232117,-0.0065078735,-0.061676025,-0.013412476,-0.025146484,-0.055755615,-0.0047302246,0.002576828,-0.02734375,0.046783447,-0.084228516,0.004722595,-0.013542175,0.009086609,-0.005580902,-0.012245178,-0.01436615,0.0073776245,0.0154418945,0.03741455,0.0129852295,-0.031143188,0.00066280365,0.016815186,0.033569336,0.033355713,0.005607605,0.05230713,-0.010482788,-0.019989014,-0.046203613,-0.0026626587,-0.0040740967,0.014564514,0.01234436,-0.0037078857,-0.019805908,0.01676941,-0.016601562,0.01876831,-0.061553955,0.03463745,0.016098022,-0.013710022,0.015434265,-0.045898438,-0.01309967,-0.005455017,-0.038513184,-0.029571533,0.021408081,0.010032654,0.011604309,-0.020889282,-0.015670776,0.009757996,-0.01826477,-0.042785645,-0.057373047,-0.022598267,0.036224365,-0.028640747,0.046539307,0.014579773,-0.077941895,0.027877808,-0.0051879883,0.019973755,-0.005203247,-0.014785767,0.011360168,0.036743164,-0.01663208,0.006412506,-0.0062713623,-0.033050537,-0.017684937,0.010627747,0.0050468445,0.014846802,0.0072669983,0.029754639,-0.008140564,0.0064697266,0.036468506,0.029586792,-0.023483276,-0.056549072,-0.082458496,-0.021102905,0.013916016,-0.01852417,0.0021266937,-0.023391724,-0.00944519,-0.080078125,-0.0099487305,-0.022613525,0.011489868,-0.054626465,-0.03765869,-0.038360596,0.013839722,-0.0068206787,-0.06317139,0.033233643,-0.0082092285,0.06982422,0.02003479,0.043060303,0.047668457,0.00055742264,0.048217773,0.032470703,-0.05328369,-0.022872925,0.0039749146,-0.027282715,-0.0019254684,0.0006942749,0.006465912,-0.018966675,0.052703857,0.061462402,0.006061554,-0.015174866,-0.0036506653,-0.06427002,-0.027679443,0.0028095245,0.034240723,0.03173828,-0.012863159,0.009689331,-0.021362305,-0.03265381,0.0124053955,0.026321411,0.009101868,0.060424805,0.022201538,0.04525757,0.028167725,-0.009277344,-0.0335083,0.038879395,0.0357666,0.005859375,0.0024375916,-0.06738281,0.02355957,0.006919861,-0.028915405,0.0103302,0.0068626404,0.015838623,-0.025939941,-0.01890564,0.002286911,-0.028396606,0.0023708344,-0.016342163,0.010002136,0.026031494,0.022155762,0.00015354156,-0.040740967,-0.081970215,0.017349243,0.017669678,0.027938843,0.0030899048,-0.009239197,-0.020950317,0.013191223,-0.043029785,0.030700684,0.061828613,-0.015571594,-0.019927979,0.010482788,-0.023376465,-0.020828247,-0.016281128,-0.025131226,-0.019821167,-0.03744507,-0.004951477,-0.05105591,0.014877319,0.023162842,0.04284668,0.025878906,-0.018096924,-0.053222656,-0.0050315857,-0.027160645,0.020507812,-0.05307007,-0.024536133,0.008552551,0.007865906,-0.015197754,0.03591919,0.01651001,0.0024490356,0.006603241,0.017333984,-0.009933472,0.0069122314,-0.02482605,0.0039138794,0.024841309,-0.05154419,0.012298584,-0.0037059784,0.044281006,-0.035247803,0.027496338,0.0012464523,0.032104492,0.050872803,-0.012145996,-0.051452637,0.013771057,0.00843811,0.009109497,0.028503418,-0.012214661,-0.014587402,-0.036468506,0.053863525,-0.016189575,-0.00015687943,0.013893127,0.021224976,0.028900146,-0.008857727,-0.030273438,-0.039367676,-0.017318726,-0.03186035,0.02279663,-0.007461548,0.04159546,-0.0021362305,0.015991211,-0.010971069,-0.0234375,-0.026000977,0.00010216236,-0.014953613,0.0039367676,-0.0074501038,-0.011627197,0.021026611,0.012504578,-0.012825012,0.013748169,0.01637268,0.009689331,-0.013916016,-0.023864746,-0.022109985,0.0015792847,-0.036010742,0.023468018,0.040740967,0.005794525,0.013168335,-0.02027893,-0.017578125,0.023452759,0.012550354,0.021499634,-0.0033721924,0.0003209114,-0.051483154,-0.07873535,-0.031707764,-0.011871338,0.02798462,0.040893555,0.0057373047,0.046081543,0.036468506,-0.015945435,-0.049468994,0.038208008,-0.0546875,0.010726929,0.042938232,-0.018569946,-0.014511108,-0.0067825317,0.008857727,0.022613525,0.053527832,0.018997192,0.008964539,0.04019165,0.026565552,0.006046295,-0.01676941,0.02368164,0.034576416,0.009498596,0.00063991547,-0.050567627,0.005706787,-0.0011663437,-0.027801514,-0.036956787,-0.07946777,0.025558472,0.050811768,0.07598877,0.030838013,0.034454346,0.004459381,-0.05493164,-0.01260376,-0.04800415,-0.0072631836,-0.037322998,-0.05130005,0.016174316,0.00037264824,0.015274048,-0.023742676,0.028274536,-0.03677368,0.0020275116,-0.028717041,0.0769043,-0.012825012,0.007217407,0.017288208,0.016174316,0.0541687,0.0569458,-0.030090332,0.041748047,0.021224976,-0.029205322,0.0043640137,0.040985107,-0.018371582,-0.007801056,-0.057891846,-0.05267334,0.0075912476,-0.00642395,-0.010604858,-0.023651123,-0.006122589,0.036865234,0.009902954,-0.023071289,-0.0104522705,0.015731812,-0.00092220306,-0.045074463,-0.008331299,-0.051330566,-0.004673004,0.04724121,0.0013456345,-0.018356323,-0.0047302246,-0.0021591187,0.009925842,0.02558899,0.0015144348,-0.0051612854,-0.03555298,0.02532959,-0.003200531,0.010917664,0.022155762,0.047912598,0.030136108,0.028945923,0.046295166,0.021560669,-0.015419006,-0.036346436,-0.0009880066,-0.055664062,-0.00944519,0.04260254,-0.019577026,-0.0029945374,-0.019958496,-0.021087646,0.012268066,0.01638794,-0.026565552,-0.00048422813,0.01852417,-0.0069274902,-0.055664062,-0.07409668,-0.028015137,0.010658264,0.08642578,0.031204224,-0.005443573,-0.019256592,-0.0178833,0.0289917,-0.006351471,0.04168701,-0.014709473,-0.015380859,-0.014793396,-0.034942627,0.0025043488,-0.017181396,0.02720642,0.02053833,-0.015838623,0.020553589,0.017868042,-0.0007033348,-0.01651001,-0.015052795,0.0047340393,0.004737854,0.004512787,-0.018630981,0.07067871,0.0032215118,-0.009483337,-0.047210693,0.027755737,0.0043640137,0.036834717,-0.029434204,-0.0011091232,0.0015668869,-0.0010671616,-0.016952515,-0.026855469,0.012886047,0.011352539,-0.046325684,-0.07879639,0.045166016,-0.018310547,0.014343262,0.018234253,0.0038414001,0.019683838,-0.026824951,0.010910034,-0.0067825317,-0.018051147,-0.03414917,-0.03186035,-0.014328003,-0.046722412,-0.022888184,-0.028656006,0.027862549,-0.02935791,0.018844604,-0.0074806213,-0.03010559,0.019683838,0.024353027,0.00504303,0.025650024,-0.0107803345,0.009307861,0.04336548,0.00008022785,-0.047668457,0.008605957,0.009773254,0.0005426407,0.032928467,0.053955078,0.0047073364,-0.019058228,0.014251709,-0.00071907043,-0.011695862,-0.04852295,-0.0014257431,-0.002040863,0.0076522827,-0.008300781,-0.030181885,0.032714844,0.030914307,-0.0579834,-0.04220581,0.02746582,0.028381348,-0.029159546,0.032806396,0.018722534,0.044311523,-0.028717041,0.027709961,0.0015764236,0.027786255,0.035125732,0.013153076,-0.011199951,-0.00592041,-0.013473511,0.0014753342,0.01751709,-0.021636963,0.009376526,0.013900757,0.038269043,0.0011548996,0.011329651,-0.020202637,-0.028244019,-0.0037517548,-0.0047721863,-0.016525269,0.039764404,0.011451721,0.01171875,0.009567261,0.023605347,0.024490356,-0.014511108,-0.0038967133,-0.014083862,0.038757324,0.00072717667,0.019088745,0.007888794,0.0008535385,0.019927979,-0.048858643,-0.0026741028,0.01512146,0.0028820038,-0.026000977,-0.050811768,-0.028945923,0.005962372,0.027313232,0.020614624,0.012741089,0.017364502,0.000079870224,-0.020706177,-0.018371582,0.013336182,0.020355225,-0.051086426,-0.053710938,0.005924225,0.011421204,0.020446777,-0.02357483,0.012306213,-0.024459839,-0.0060691833,0.010612488,-0.047210693,0.0007510185,-0.0033569336,-0.0034828186,0.0065574646,0.00497818,0.011268616,-0.012611389,-0.04949951,0.016021729,-0.014808655,0.06573486,-0.048034668,0.033966064,-0.004917145,-0.0023269653,0.0034751892,0.030395508,0.015975952,0.039489746,0.020874023,0.029663086,-0.024169922,0.04434204,-0.018051147,0.007385254,-0.010643005,-0.060424805,-0.0102005005,-0.025527954,0.00182724,0.045532227,-0.031021118,-0.007873535,-0.036102295,-0.02935791,-0.00907135,-0.048065186,0.013641357,0.032562256,0.048797607,-0.03010559,0.014083862,0.008262634,0.0076942444,-0.006351471,-0.02142334,-0.0061683655,0.014785767,0.013801575,0.024154663,-0.030654907,-0.01209259,0.004878998,0.025314331,-0.030181885,-0.033813477,0.0046653748,-0.006198883,-0.013679504,0.037200928,-0.009819031,-0.013000488,-0.010147095,-0.059143066,-0.010635376,-0.008148193,0.019042969,0.02217102,-0.010932922,-0.014411926,0.007709503,-0.017868042,0.031829834,-0.0126571655,-0.023086548,-0.05090332,0.0050964355,0.004749298,0.025909424,0.0070495605,-0.041778564,-0.0019779205,-0.03286743,-0.057373047,-0.0132369995,0.01626587,-0.01159668,0.0046691895,-0.015403748,-0.03970337,0.012840271,-0.030349731,-0.015327454,0.0005068779,-0.011299133,-0.0015296936,-0.012496948,0.021026611,0.040100098,-0.0015029907,-0.023040771,-0.006324768,0.010025024,0.01586914,0.030883789,0.019897461,-0.012084961,-0.024291992,0.007774353,0.008079529,-0.004272461,-0.03704834,0.009132385,-0.016403198,-0.010032654,0.00036096573,0.0059547424,-0.016815186,0.016952515,0.06713867,-0.004917145,0.008773804,0.005970001,-0.030838013,0.02130127,0.048797607,-0.011978149,0.0028705597,-0.036743164,0.011451721,0.0040664673,0.03564453,0.008972168,0.025238037,-0.010810852,-0.009101868,-0.0017213821,0.0013475418,0.0028896332,-0.05166626,-0.01965332,-0.06915283,0.00028181076,-0.0093307495,-0.042633057,0.017288208,0.0132369995,-0.015007019,-0.0619812,0.00018954277,0.048828125,-0.013160706,0.01802063,0.0064048767,0.05432129,0.0033016205,-0.025756836,-0.009239197,0.008972168,-0.051483154,-0.021743774,-0.03994751,0.031341553,-0.021728516,-0.011306763,0.021820068,-0.0063285828,0.022720337,-0.017807007,0.030288696,-0.023666382,0.015686035,-0.021453857,0.008262634,-0.012512207,-0.016204834,0.044891357,-0.036254883,0.04055786,0.033325195,0.03253174,0.0065307617,-0.0038585663,0.029953003,-0.042266846,0.013763428,0.03173828,0.03213501,0.03543091,-0.0025997162,0.004962921,0.018249512,0.023956299,-0.010269165,-0.011184692,-0.009483337,-0.034454346,-0.0143966675,0.031982422,-0.019439697,0.0018491745,-0.025543213,0.0008788109,0.0037155151,0.013694763,0.010940552,-0.023956299,-0.0048332214,-0.027755737,0.009773254,0.0005455017,-0.007320404,-0.010604858,0.03062439,-0.007396698,0.018661499,0.010818481,-0.005683899,0.00762558,0.03894043,0.005142212,-0.005859375,0.014450073,0.012680054,0.01890564,-0.0067710876,0.011741638,-0.03982544,-0.0018138885,-0.014587402,0.008880615,-0.0021362305,-0.023284912,0.011688232,-0.0047073364,0.003446579,-0.011413574,-0.038269043,-0.012451172,-0.017974854,-0.016601562,-0.0062408447,-0.02368164,0.01386261,0.015274048,0.0039596558,0.0030899048,-0.021469116,0.04196167,0.005290985,-0.008300781,0.012840271,0.023529053,-0.008392334,-0.031204224,-0.0016012192,-0.008277893,-0.027648926,0.023605347,-0.014709473,-0.0053901672,0.028121948,0.008369446,-0.0004749298,0.009307861,0.03250122,-0.015388489,0.014526367,0.015403748,0.01600647,-0.02772522,0.020095825,-0.037017822,0.024124146,0.004070282,0.029647827,0.005115509,-0.014198303,-0.0112838745,0.025222778,0.025421143,-0.0076560974,0.04055786,0.0043640137,0.040039062,-0.020065308,-0.010513306,-0.0129776,-0.008560181,-0.002872467,0.024154663,0.000022530556,0.01828003,-0.0035915375,0.0020580292,0.004749298,-0.039398193,0.033355713,0.016174316,0.0149383545,-0.035736084,-0.040161133,-0.013000488,0.006679535,-0.04660034,0.0075149536,0.0107803345,0.034851074,0.03378296,0.030273438,-0.0044555664,0.0026378632,0.008964539,-0.028121948,-0.027130127,-0.017593384,-0.0154953,0.025421143,-0.009712219,0.027542114,0.059143066,-0.0024814606,0.035308838,0.040374756,0.018051147,0.014450073,0.014060974,-0.03302002,0.029724121,-0.010566711,0.014083862,0.017074585,0.039733887,-0.012954712,0.030578613,-0.011978149,0.019226074,-0.026763916,0.026565552,0.09069824,0.029846191,0.006149292,0.052856445,-0.019332886,-0.024658203,-0.008560181,-0.015457153,0.046966553,-0.0076828003,0.031173706,0.036895752,0.017791748,-0.004219055,-0.003900528,-0.014953613,-0.034698486,0.03555298,0.027313232,0.00053167343,-0.0044517517,-0.02720642,0.009414673,-0.023361206,-0.027648926,0.0067977905,0.007205963,0.011688232,-0.011123657,-0.004917145,-0.018493652,-0.0033359528,0.02255249,-0.0025558472,-0.0135650635,0.046783447,0.025527954,-0.004825592,0.012710571,-0.005580902,0.034576416,-0.014045715,-0.012252808,0.014152527,0.013450623,0.0009965897,-0.027755737,0.017745972,-0.0059013367,0.032287598,0.04824829,-0.021850586,0.0033626556,0.02104187,-0.008728027,-0.00274086,0.033569336,0.024124146,0.012702942,0.044128418,0.036987305,0.01889038,-0.020065308,0.0077934265,0.0056266785,0.019821167,-0.0072288513,0.0040359497,0.004589081,-0.019165039,0.014831543,-0.0061187744,-0.032714844,0.03579712,0.015930176,-0.013336182,-0.0013637543,-0.01171875,0.026275635,-0.022750854,-0.015159607,0.012001038,-0.0035800934,0.02583313,0.031066895,0.038208008,-0.006752014,0.024902344,0.022354126,-0.02557373,-0.0028419495,0.019943237,-0.01979065,-0.008087158,-0.004623413,-0.0074157715,-0.050109863,0.015533447,0.0076522827,-0.0079422,0.019317627,-0.010192871,-0.017730713,-0.006752014,0.021347046,0.0072898865,-0.0010499954,0.010551453,-0.015899658,0.011230469,0.034484863,-0.020614624,0.0033073425,-0.009727478,-0.007701874,-0.003835678,-0.0041275024,-0.03741455,-0.0049324036,-0.009941101,-0.052825928,0.0050468445,0.022567749,0.009567261,0.05545044,-0.005455017,-0.012619019,-0.005340576,0.037078857,0.008117676,0.000023722649,-0.005657196,0.0053253174,-0.023529053,0.0513916,0.024291992,-0.0072631836,0.023330688,-0.0029964447,-0.025299072,-0.010437012,0.003419876,0.021118164,-0.018676758,-0.008300781,0.0056877136,0.033050537,-0.012939453,-0.04208374,-0.007080078,-0.01600647,-0.020599365,-0.038513184,0.01373291,0.0052948,0.023757935,0.022155762,0.028915405,-0.026000977,0.06591797,-0.017974854,0.03829956,-0.027267456,0.0031051636,0.050964355,0.021011353,0.039367676,0.0049324036,0.0062713623,-0.016860962,0.0135650635,0.03375244,0.013092041,0.02935791,0.002588272,-0.010971069,0.024887085,-0.0074691772,0.0236969,-0.00043702126,0.0026435852,0.024093628,-0.011230469,0.0023078918,-0.0055160522,0.005004883,0.011009216,0.02798462,-0.0055389404,0.013580322,-0.03945923,-0.00026082993,0.032836914,0.010765076,0.012954712,0.003227234,-0.013298035,0.02734375,-0.015899658,-0.02079773,-0.010406494,0.0058174133,-0.07885742,-0.022949219,0.020874023,0.013900757,-0.02142334,0.06439209,0.0035209656,0.007282257,0.028900146,0.033599854,-0.009742737,0.039489746,0.0018997192,0.037597656,0.046936035,-0.0010442734,-0.017181396,0.03149414,0.007972717,-0.0155181885,0.024276733,0.039031982,-0.0028381348,0.02949524,-0.0034008026,0.001458168,0.0021762848,0.0035820007,-0.010650635,-0.003540039,-0.019683838,-0.010032654,-0.006893158,0.02229309,-0.020874023,-0.011428833,-0.020828247,-0.019973755,0.0044670105,0.038726807,0.02053833,-0.040527344,0.010627747,0.00036883354,-0.0025615692,-0.01626587,-0.0016336441,-0.00806427,-0.04360962,0.014381409,0.02154541,-0.0049591064,0.036102295,-0.03237915,-0.0050468445,0.034210205,0.030883789,0.037719727,-0.0007777214,-0.007873535,0.02053833,-0.011993408,0.019454956,-0.014419556,-0.010009766,0.019851685,0.009262085,0.0067443848,-0.01689148,0.028381348,-0.024353027,0.013595581,-0.0067253113,0.022216797,0.024353027,-0.010002136,-0.0016746521,0.013748169,0.04284668,-0.008483887,-0.028793335,-0.00894165,0.024108887,0.076416016,-0.0011100769,0.008903503,0.02079773,0.031982422,0.012962341,0.047607422,0.008659363,0.02319336,0.015472412,-0.00843811,-0.013145447,0.034606934,-0.009475708,-0.021850586,0.03050232,-0.043914795,-0.027832031,0.018630981,0.015312195,0.011764526,-0.040008545,-0.0021800995,-0.024124146,-0.042816162,-0.0039787292,-0.005367279,-0.0055007935,0.00015377998,0.00006681681,0.019439697,0.0065345764,-0.019607544,-0.00035953522,0.00085783005,-0.032043457,-0.05404663,-0.008476257,-0.020050049,0.012741089,-0.039367676,0.0040359497,0.005153656,0.019699097,-0.012001038,-0.0025177002,-0.0023326874,0.012527466,0.022537231,0.008895874,0.013763428,-0.010871887,-0.027542114,-0.013320923,-0.00843811,-0.0010738373,0.033172607,-0.019851685,0.029693604,0.021118164,0.0024433136,-0.0010108948,-0.0039253235,-0.01235199,-0.013343811,-0.02468872,-0.015655518,0.019836426,0.020706177,0.00982666,-0.01789856,0.026672363,-0.011459351,-0.029388428,0.014030457,0.04586792,0.01638794,0.012191772,-0.0067710876,0.0028762817,-0.03942871,0.0017910004,-0.0035152435,0.006477356,0.021820068,-0.0030879974,-0.0034179688,0.02279663,0.01676941,-0.012649536,0.0010433197,0.037200928,0.004322052,0.007785797,0.022766113,-0.0014123917,0.0082092285,-0.035858154,-0.030731201,0.015045166,0.044647217,0.012863159,0.0063552856,-0.013580322,0.0016183853,-0.0044517517,-0.0038928986,0.0068855286,-0.008666992,-0.044830322,-0.016784668,-0.017028809,0.03152466,0.005306244,0.0026378632,-0.007209778,0.011543274,-0.011528015,-0.02633667,-0.018188477,0.0473938,0.016098022,-0.032196045,-0.01586914,0.012420654,-0.0034885406,-0.025741577,-0.00039219856,-0.06335449,-0.0231781,-0.0118637085,-0.014175415,0.010391235,0.001543045,0.0050468445,-0.009605408,0.00944519,-0.006160736,0.013557434,0.008415222,-0.013397217,-0.009635925,0.027053833,0.011116028,-0.006614685,0.024124146,0.016326904,-0.015701294,0.0121536255,-0.0025806427,0.004219055,-0.040374756,0.018997192,0.01449585,-0.003376007,0.016418457,-0.024978638,0.033843994,0.0013523102,0.012916565,-0.014411926,0.0025997162,0.020233154,-0.015182495,-0.023712158,-0.0034561157,-0.011909485,-0.037750244,0.013710022,0.01701355,0.020492554,-0.029953003,0.035491943,-0.017471313,-0.015090942,0.016174316,0.015068054,-0.016571045,-0.00018560886,0.022155762,0.00026607513,-0.0060768127,-0.008705139,-0.014022827,-0.014472961,-0.027236938,-0.00831604,-0.015571594,0.0140686035,0.03677368,-0.006313324,0.04510498,0.013267517,0.022079468,0.022994995,0.0050735474,0.029281616,0.003227234,0.03390503,0.020736694,-0.014030457,0.011993408,0.0018558502,-0.020874023,0.0019073486,-0.006816864,0.015235901,-0.010047913,0.00027418137,0.0075149536,0.014717102,0.020019531,0.016693115,-0.004875183,0.024169922,-0.04360962,-0.017425537,-0.020828247,-0.002588272,0.028503418,0.015342712,0.014663696,-0.0026016235,-0.007663727,0.020370483,0.036346436,-0.014472961,-0.015007019,-0.0028095245,0.012466431,-0.010009766,0.0071983337,0.00598526,-0.026260376,-0.009422302,-0.006401062,-0.017730713,0.024765015,-0.0069503784,0.010398865,-0.002111435,-0.020202637,-0.035827637,0.00869751,-0.016693115,-0.0007147789,0.025787354,-0.005252838,0.014160156,0.015144348,-0.031021118,0.016052246,0.034332275,-0.030838013,0.026931763,0.027267456,0.00018155575,0.0033664703,-0.00039863586,-0.0368042,-0.018600464,0.0045814514,-0.008003235],"createdAt":"2026-04-18T18:52:35.122Z","updatedAt":"2026-04-28T14:35:21.578Z","lastSeenAt":"2026-04-28T14:35:21.578Z","tsv":"'/request':11,24 '0.02':10,23,77,109 '000':72 '0x8335':64 '2':41 '20':71 '2913':65 '6':82 'Base USDC API' 'accept':48,209 'agent':182 'ai/ml':99 'analyt':98 'api':95,150 'appear':121 'base':8,21,59,73 'behind':42 'beyond':177 'bodi':136 'broad':89 'call':111 'catalog':90 'categori':119 'challeng':194 'confirm':201 'connect':156 'contract':63 'cost':69 'crawl':145 'data':3,16,34,97,102 'decim':83 'defin':130 'deliv':123 'doc':147 'document':137,176,190 'endpoint':28,47,114,166,191,203 'equal':76 'exact':160 'exampl':140 'field':161 'financ':118 'finance API' 'finance/web3':101 'form':200 'found':142 'gate':94 'host':87 'id':40 'infer':100 'infrastructur':104 'investment performance' 'json':53 'json-response' 'land':179 'light':189 'lightly-docu':188 'list':181 'live':196 'lowpaymentfee.com':30,86 'maximum':68 'metric':125 'micropay':6,19 'micropayment' 'network':9,22,60 'openapi':133 'oper':205 'page':151,180 'particular':113 'payment':54,210 'paywal':45 'per':78,110 'perform':2,15,33,124,165 'portfolio':1,14,32,38,39,131 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':49 'post-method' 'pre':129 'pre-defin':128 'price':107,148 'provid':85 'publish':173 'readi':207 'request':50,79,135 'respons':139 'return':31,52,153,162 'schema':134,174 'settl':56 'sit':115 'span':96 'specif':37 'stub':158 'treat':184 'unit':74 'unknown':168 'usdc':13,26,62,80 'usdc-base' 'use':61,81 'util':105 'via':4,17 'wallet':157 'well':199 'well-form':198 'x402':5,18,44,93,193 'x402 finance' 'x402-gated':92 'x402-payment'","prices":[{"id":"a5684947-9c85-447e-939f-8002ba82106d","listingId":"4338ffb2-2029-4d3e-bb2f-8974c3e3591c","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/2/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:35.122Z"}],"sources":[{"listingId":"4338ffb2-2029-4d3e-bb2f-8974c3e3591c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/2/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:35.122Z","lastSeenAt":"2026-04-28T14:35:21.578Z"}],"details":{"listingId":"4338ffb2-2029-4d3e-bb2f-8974c3e3591c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/2/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/2/performance"},{"claim":"All APIs on lowpaymentfee.com 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/2/performance"}],"useCases":["Retrieve performance metrics for a tracked portfolio","Integrate portfolio return data into a dashboard or agent workflow","Automated portfolio monitoring with per-call micropayments"],"bestFor":["Agents needing on-demand portfolio performance data without API key signup","Developers prototyping finance dashboards with pay-per-use pricing","x402-compatible wallets exploring low-cost financial data endpoints"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-frequency polling where $0.02/request adds up quickly","Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 2)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.798Z"},"updatedAt":"2026-04-28T14:35:21.578Z"}}