{"id":"48be48e9-0843-4dbb-af09-8b83fc45c093","shortId":"ksYfkQ","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 provides portfolio performance data behind an x402 paywall. The specific resource `/api/v1/portfolios/4/performance` returns JSON data related to portfolio #4's performance metrics. Payment is settled on the Base network using USDC (contract 0x8335…2913) at $0.02 per request (20,000 base units with 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 uniformly at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, example payloads, or detailed field descriptions available for this endpoint.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. It accepts POST requests and outputs application/json. Because the endpoint path suggests a specific portfolio ID (4), it is unclear whether other portfolio IDs are supported or how the request body should be structured. Without documentation or an OpenAPI spec, consumers will need to experiment or contact the provider for integration details.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","post-method"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio tracking","financial data API","x402 finance","pay-per-call portfolio","Base USDC API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet'","No OpenAPI or output schema provided; request body format is unknown","Endpoint targets a hardcoded portfolio ID (4); unclear if other IDs are supported","Provider site lists many endpoints across diverse categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/4/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/4/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation, no request/response schema, and no examples. All doc pages return only 'Connect wallet' with no content. The endpoint path and description are generic ('Premium API Access'), making it hard to know what data is actually returned.","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":"2026-04-19T08:31:05.215Z","embedding":[0.0003194809,-0.01474762,0.031951904,0.027755737,0.018356323,-0.01399231,-0.040222168,-0.004989624,0.0748291,-0.033813477,0.025909424,-0.03967285,-0.021835327,-0.059539795,0.0057258606,0.0015830994,0.032562256,-0.014480591,-0.045776367,0.05831909,0.028747559,-0.021072388,-0.00039219856,0.003036499,-0.010139465,-0.000323534,-0.022399902,-0.0077819824,-0.022720337,-0.042419434,0.026306152,-0.023925781,-0.013221741,0.0064926147,-0.029907227,-0.0005121231,0.008049011,0.02633667,0.021102905,-0.00504303,0.0075950623,-0.05154419,0.028518677,-0.00699234,-0.024658203,-0.0039749146,0.027297974,-0.047729492,0.04345703,0.015563965,-0.025024414,0.0019006729,-0.007972717,0.013946533,0.027938843,0.021499634,0.04373169,-0.0063972473,0.0062789917,0.02557373,0.0061798096,-0.043395996,0.023483276,-0.004714966,0.0037021637,0.030456543,-0.03189087,0.054748535,0.006465912,0.08135986,0.016296387,0.047729492,0.021896362,0.023757935,-0.015182495,-0.01979065,-0.012329102,0.03353882,0.0072250366,-0.039001465,-0.0054359436,0.007835388,-0.06512451,-0.009147644,-0.028427124,-0.05734253,-0.004196167,0.0024585724,-0.03552246,0.042419434,-0.079956055,0.0040130615,-0.019470215,0.004901886,-0.010185242,-0.029388428,-0.0055656433,0.021240234,0.00944519,0.04348755,-0.00007683039,-0.030410767,-0.017105103,0.021270752,0.041809082,0.038482666,0.014274597,0.051086426,-0.021560669,-0.022750854,-0.051483154,-0.017501831,-0.006248474,0.009216309,0.012435913,-0.0060653687,-0.018814087,0.010643005,-0.026062012,0.0062446594,-0.0680542,0.02897644,0.0256958,-0.0016078949,0.015037537,-0.047851562,-0.0071258545,-0.019882202,-0.020904541,-0.03286743,0.015037537,0.012298584,0.014602661,-0.02355957,-0.0052261353,0.0014390945,-0.013763428,-0.036865234,-0.050689697,-0.014480591,0.024963379,-0.022460938,0.0524292,0.014953613,-0.06744385,0.02381897,-0.006275177,0.025985718,0.0024471283,-0.009483337,0.004322052,0.02961731,-0.01146698,0.0016965866,0.004558563,-0.042419434,-0.009727478,0.021972656,0.007080078,0.017822266,0.007297516,0.022735596,-0.017745972,-0.00059223175,0.02406311,0.036621094,-0.010276794,-0.058624268,-0.07928467,-0.0287323,0.026382446,-0.021118164,-0.0060424805,-0.019989014,-0.012771606,-0.07940674,0.0061912537,-0.025848389,0.0068511963,-0.04727173,-0.033294678,-0.04272461,0.0055236816,-0.013763428,-0.06921387,0.042022705,-0.014823914,0.060150146,0.01965332,0.0524292,0.045166016,0.0029449463,0.03930664,0.018569946,-0.04800415,-0.021270752,-0.0046844482,-0.023239136,-0.0003578663,0.000579834,0.00806427,-0.008361816,0.04724121,0.05505371,0.011077881,-0.025817871,-0.002111435,-0.06762695,-0.03930664,0.008796692,0.025634766,0.03149414,-0.006214142,0.02027893,-0.014709473,-0.040893555,0.010513306,0.039489746,0.0050621033,0.06652832,0.022750854,0.039093018,0.025817871,-0.009407043,-0.022628784,0.050750732,0.031066895,0.0006251335,-0.0026683807,-0.064086914,0.026306152,0.009048462,-0.02281189,0.014785767,0.003036499,0.0044441223,-0.026260376,-0.020812988,0.009521484,-0.031097412,0.010467529,-0.016983032,0.0102005005,0.026489258,0.019042969,0.0030345917,-0.041992188,-0.08660889,0.016952515,0.021621704,0.03604126,-0.00014686584,-0.008384705,-0.015182495,0.011764526,-0.03262329,0.02998352,0.060455322,-0.022567749,-0.013298035,0.019515991,-0.018005371,-0.03048706,-0.015777588,-0.03060913,-0.0121154785,-0.034820557,-0.0072784424,-0.059143066,0.009902954,0.03250122,0.038269043,0.015991211,-0.016784668,-0.05444336,-0.0021362305,-0.022567749,0.009788513,-0.055023193,-0.020935059,0.009056091,0.011917114,-0.0236969,0.046722412,0.015090942,-0.004840851,0.018478394,0.026977539,-0.0011644363,0.00819397,-0.015411377,0.0057640076,0.034454346,-0.050598145,0.0058784485,-0.0049934387,0.048706055,-0.03753662,0.03427124,0.0058517456,0.030380249,0.031585693,-0.019439697,-0.057159424,0.011550903,0.010025024,0.0009889603,0.026977539,-0.011436462,-0.028060913,-0.03363037,0.054718018,-0.021347046,0.0027694702,0.011909485,0.024124146,0.03086853,-0.01977539,-0.023605347,-0.038085938,-0.024490356,-0.030944824,0.02633667,0.0049934387,0.037902832,-0.009483337,0.0181427,-0.01335907,-0.029083252,-0.019622803,0.0034770966,-0.022109985,0.0027885437,-0.0018796921,-0.012451172,0.01499939,-0.00039100647,-0.010643005,0.009613037,0.014297485,0.008651733,-0.019989014,-0.024215698,-0.030258179,-0.004142761,-0.035949707,0.018951416,0.04559326,0.0029754639,0.013877869,-0.012298584,-0.019561768,0.021087646,0.020187378,0.026748657,-0.0046844482,-0.005088806,-0.040924072,-0.088256836,-0.031707764,-0.012481689,0.028701782,0.041931152,-0.0026550293,0.043151855,0.03149414,-0.014213562,-0.059051514,0.036590576,-0.05307007,0.01209259,0.034576416,-0.010818481,-0.021530151,-0.0071372986,0.017669678,0.0129470825,0.044311523,0.021469116,0.016738892,0.03463745,0.03277588,0.008628845,-0.0035057068,0.023330688,0.033325195,0.002090454,0.006668091,-0.05105591,0.016937256,-0.004627228,-0.02243042,-0.039093018,-0.078125,0.026489258,0.039398193,0.06628418,0.029830933,0.03164673,0.0042381287,-0.05380249,-0.0013198853,-0.045562744,-0.0021572113,-0.035339355,-0.05670166,0.023590088,-0.00060272217,0.013679504,-0.024276733,0.039764404,-0.045043945,-0.0011987686,-0.028961182,0.074645996,-0.02204895,0.000087320805,0.010169983,0.016662598,0.04901123,0.05203247,-0.031433105,0.03967285,0.013755798,-0.025527954,0.0039520264,0.045013428,-0.016494751,-0.0067100525,-0.05908203,-0.04989624,0.00605011,-0.0007352829,0.00008070469,-0.02558899,-0.004219055,0.02368164,-0.00035429,-0.027832031,-0.00009459257,0.011688232,-0.008491516,-0.052825928,-0.016342163,-0.04840088,-0.012634277,0.043762207,0.00598526,-0.025726318,-0.010284424,-0.016921997,0.01914978,0.022750854,0.01133728,-0.010932922,-0.028213501,0.03112793,-0.014198303,0.018173218,0.0055770874,0.051971436,0.031433105,0.019866943,0.057403564,0.021224976,-0.012550354,-0.038085938,-0.00982666,-0.061584473,-0.014183044,0.042633057,-0.016738892,-0.0010375977,-0.027755737,-0.023208618,0.011199951,0.009101868,-0.0209198,0.0041885376,0.007461548,-0.008171082,-0.038757324,-0.070129395,-0.026916504,0.0069274902,0.09283447,0.033172607,0.00042939186,-0.027145386,-0.023101807,0.021133423,-0.0020122528,0.04071045,-0.014259338,-0.021057129,-0.013282776,-0.026794434,-0.010688782,-0.019805908,0.020874023,0.027832031,-0.0064048767,0.019699097,0.025527954,0.01083374,-0.025100708,-0.01108551,0.009407043,0.001914978,-0.00036382675,-0.005760193,0.06390381,0.005302429,-0.013298035,-0.05718994,0.01876831,0.011833191,0.03656006,-0.0340271,0.003967285,0.0025978088,-0.013473511,-0.013702393,-0.019866943,0.010154724,0.0054130554,-0.05050659,-0.079589844,0.045013428,-0.016052246,0.017532349,0.012420654,-0.0026798248,0.016021729,-0.017959595,0.012680054,-0.011779785,-0.02458191,-0.04348755,-0.02960205,-0.023925781,-0.04421997,-0.031097412,-0.02798462,0.021469116,-0.03250122,0.020095825,-0.0018844604,-0.031066895,0.025924683,0.022918701,0.010528564,0.02003479,-0.008720398,0.004497528,0.033111572,-0.002784729,-0.0501709,0.015930176,0.010864258,0.0034770966,0.024673462,0.058685303,-0.0010232925,-0.016815186,0.029006958,-0.00289917,-0.010192871,-0.036010742,-0.004825592,0.001420021,0.0066719055,-0.0079193115,-0.03277588,0.029922485,0.027130127,-0.05822754,-0.03656006,0.030670166,0.03692627,-0.030151367,0.026184082,0.014602661,0.03982544,-0.027435303,0.03488159,-0.004096985,0.025970459,0.035827637,0.010688782,0.001540184,0.00036263466,-0.018859863,-0.0029182434,0.008926392,-0.011367798,-0.0024852753,0.017684937,0.039031982,0.008041382,0.010879517,-0.029571533,-0.020629883,-0.01008606,-0.013648987,-0.0066337585,0.043518066,0.016021729,0.016052246,-0.0016965866,0.020217896,0.024719238,-0.023147583,-0.003868103,-0.010032654,0.047027588,0.004119873,0.02607727,0.000705719,0.007385254,0.021453857,-0.031341553,-0.006011963,0.0075645447,-0.0026435852,-0.010360718,-0.050750732,-0.016815186,0.00944519,0.029541016,0.014556885,0.0138168335,0.009307861,-0.002040863,-0.018508911,-0.017120361,0.014183044,0.020843506,-0.042541504,-0.049804688,0.013755798,0.014503479,0.018127441,-0.0152282715,0.015586853,-0.03086853,-0.00024843216,0.0037212372,-0.037322998,-0.00007969141,-0.0118637085,-0.0076141357,0.008514404,0.008781433,0.015167236,-0.010848999,-0.051849365,0.016952515,-0.024169922,0.06298828,-0.041229248,0.04421997,-0.008575439,-0.024871826,0.0042877197,0.034240723,0.024124146,0.03387451,0.017440796,0.037506104,-0.027359009,0.049438477,-0.015014648,0.0060424805,-0.0099487305,-0.06567383,-0.0149383545,-0.014518738,-0.0043258667,0.049835205,-0.03439331,-0.007686615,-0.039886475,-0.028213501,-0.009933472,-0.040985107,0.02166748,0.034973145,0.047729492,-0.031280518,0.012542725,0.010169983,0.0050086975,-0.00969696,-0.030380249,-0.0036411285,0.016311646,0.009994507,0.02029419,-0.025177002,-0.010520935,0.006412506,0.026306152,-0.031433105,-0.037475586,0.011001587,-0.008430481,-0.024475098,0.028930664,-0.0085372925,-0.011482239,-0.011962891,-0.05670166,-0.014801025,-0.007381439,0.0262146,0.01725769,-0.0047950745,-0.014030457,0.016403198,-0.01939392,0.013450623,-0.00907135,-0.018661499,-0.044189453,-0.00077295303,0.0022239685,0.027069092,0.008293152,-0.034088135,-0.0017795563,-0.0234375,-0.055480957,-0.007610321,0.023590088,-0.012779236,0.008003235,-0.020431519,-0.028167725,0.013641357,-0.024520874,-0.019241333,-0.0006599426,-0.0104599,0.0015983582,-0.015129089,0.014099121,0.040802002,0.0063476562,-0.016296387,-0.010047913,0.009376526,0.024642944,0.034240723,0.01626587,-0.016586304,-0.02684021,0.0104522705,0.0079574585,-0.0031032562,-0.035125732,0.0138549805,-0.0093688965,-0.016647339,-0.0023841858,0.021331787,-0.023208618,0.028518677,0.06695557,0.0052452087,-0.010910034,0.008140564,-0.02709961,0.01878357,0.05178833,-0.012557983,-0.00042819977,-0.03604126,0.0140686035,0.0053634644,0.042114258,0.005607605,0.028671265,-0.017837524,-0.002998352,-0.005607605,-0.007297516,-0.00806427,-0.04852295,-0.020111084,-0.074279785,-0.004306793,-0.02017212,-0.04071045,0.022521973,0.017593384,-0.0099105835,-0.07373047,-0.00021314621,0.05001831,-0.014404297,0.012413025,0.006286621,0.059448242,0.016326904,-0.031173706,-0.004470825,0.009422302,-0.052581787,-0.013641357,-0.027557373,0.031921387,-0.022537231,-0.0030174255,0.018005371,-0.0151901245,0.02760315,-0.011161804,0.026916504,-0.01158905,0.019515991,-0.018814087,0.0110321045,-0.008850098,-0.032562256,0.052368164,-0.0262146,0.036712646,0.039123535,0.031143188,0.00881958,0.006565094,0.03555298,-0.030410767,0.00095272064,0.030212402,0.024230957,0.02305603,-0.0064048767,0.0073013306,0.0105896,0.02204895,-0.01020813,-0.0019407272,-0.003124237,-0.03555298,-0.00749588,0.028671265,-0.021942139,-0.0065841675,-0.02128601,0.00856781,0.0022792816,0.004371643,0.004184723,-0.030517578,-0.009292603,-0.024765015,0.0024414062,0.006263733,-0.0042419434,-0.0056037903,0.02305603,-0.010604858,0.0074882507,0.010482788,-0.00283432,0.010177612,0.04397583,0.008964539,0.0036029816,0.007965088,0.013015747,0.019989014,-0.01826477,0.010910034,-0.037353516,-0.008659363,-0.018585205,0.0074882507,-0.005207062,-0.02607727,0.011367798,-0.004058838,-0.0020923615,-0.00012028217,-0.03793335,-0.014480591,-0.016342163,-0.008155823,-0.008560181,-0.02078247,0.0051879883,0.018249512,0.0149002075,-0.0022678375,-0.023086548,0.038085938,0.0032348633,-0.013725281,0.018951416,0.012283325,-0.0056381226,-0.033813477,-0.0012254715,-0.0010900497,-0.022445679,0.026489258,-0.01878357,-0.0070991516,0.03677368,0.0036735535,0.0022525787,0.009849548,0.042663574,-0.022460938,0.013793945,0.016616821,0.010299683,-0.034332275,0.017074585,-0.019607544,0.036193848,0.0017080307,0.027053833,0.008399963,-0.014976501,-0.014183044,0.023284912,0.019210815,-0.005039215,0.028015137,-0.00037837029,0.041046143,-0.018371582,-0.019439697,-0.0151901245,-0.007980347,0.0039024353,0.0309906,0.004524231,0.016708374,0.0013885498,-0.0005393028,0.002040863,-0.041168213,0.029037476,0.016738892,0.010551453,-0.037322998,-0.042266846,-0.018005371,0.004989624,-0.050476074,0.004600525,0.012367249,0.037109375,0.030593872,0.031982422,-0.00009250641,-0.008102417,0.0062217712,-0.030822754,-0.019424438,-0.017745972,-0.009521484,0.016937256,-0.016098022,0.022079468,0.061584473,-0.0029945374,0.035125732,0.03503418,0.01878357,0.011222839,0.0059814453,-0.02709961,0.026992798,-0.0030441284,0.014404297,0.015686035,0.030670166,-0.014251709,0.02796936,-0.003862381,0.01663208,-0.031433105,0.037322998,0.089538574,0.034484863,0.007827759,0.050323486,-0.023147583,-0.023910522,-0.01789856,-0.018203735,0.051696777,-0.008758545,0.032409668,0.045074463,0.009727478,-0.010635376,-0.010971069,-0.012207031,-0.04019165,0.035186768,0.02758789,0.006538391,0.0014638901,-0.024246216,0.011703491,-0.036346436,-0.030334473,0.00012350082,-0.001159668,0.016113281,-0.0070343018,-0.00868988,-0.021209717,0.006832123,0.024734497,-0.016403198,-0.020065308,0.040283203,0.014144897,-0.011192322,0.014427185,-0.004962921,0.038085938,-0.006629944,-0.009048462,0.020248413,0.014656067,-0.0059776306,-0.026947021,0.017745972,-0.0028076172,0.029190063,0.044921875,-0.021621704,0.007030487,0.01499939,-0.0054397583,-0.010055542,0.020431519,0.023208618,0.0044059753,0.039764404,0.03503418,0.016662598,-0.029647827,0.01651001,0.0011425018,0.021972656,-0.008979797,-0.011985779,0.0031967163,-0.015823364,0.017440796,0.0018482208,-0.040863037,0.03286743,0.015037537,-0.0077667236,0.00092983246,-0.00046491623,0.032043457,-0.013221741,-0.019805908,0.011878967,0.005016327,0.027282715,0.029388428,0.044189453,-0.0134887695,0.021530151,0.020812988,-0.021957397,-0.0053215027,0.016662598,-0.015457153,-0.015563965,-0.004585266,-0.01398468,-0.050445557,0.01687622,-0.0010261536,0.003540039,0.018920898,-0.0128479,-0.01701355,-0.008422852,0.018463135,-0.0014858246,-0.00655365,0.012924194,-0.02331543,0.0062713623,0.029907227,-0.014656067,0.009681702,-0.009147644,-0.008720398,0.0017585754,-0.0059432983,-0.037628174,-0.0049552917,-0.0104904175,-0.044708252,0.006111145,0.016723633,0.009986877,0.061065674,-0.005771637,-0.023590088,-0.008110046,0.037200928,0.0067749023,0.009162903,-0.008872986,0.00013768673,-0.023864746,0.046447754,0.019683838,0.0008649826,0.015113831,-0.0037155151,-0.029205322,-0.024215698,-0.003112793,0.02798462,-0.013450623,-0.014411926,0.006126404,0.038024902,-0.009994507,-0.032226562,-0.0038833618,-0.012680054,-0.015625,-0.032104492,0.02218628,0.0065460205,0.024276733,0.017440796,0.025360107,-0.028060913,0.06549072,-0.014450073,0.040222168,-0.026000977,0.0042037964,0.04458618,0.027069092,0.04473877,-0.006465912,0.004261017,-0.021133423,0.008926392,0.041015625,0.018966675,0.029953003,0.0031394958,-0.0137786865,0.028930664,0.0014152527,0.019683838,0.0034065247,0.0067634583,0.030761719,-0.011528015,0.0029201508,-0.010246277,0.010848999,0.012832642,0.027450562,-0.0005707741,0.010368347,-0.037872314,0.0059013367,0.02671814,0.011688232,0.014732361,0.0074882507,-0.012214661,0.033935547,-0.017303467,-0.020645142,-0.011817932,0.0003077984,-0.07525635,-0.027374268,0.014144897,0.018417358,-0.01852417,0.061950684,-0.0010919571,0.009918213,0.029525757,0.027526855,-0.010437012,0.034088135,0.002243042,0.037719727,0.054595947,-0.004760742,-0.015266418,0.028167725,0.015296936,-0.015945435,0.02444458,0.046966553,0.0026226044,0.025909424,-0.01121521,-0.003358841,0.00015294552,0.0104522705,-0.0054969788,-0.0079574585,-0.007881165,-0.0047721863,-0.01184845,0.02545166,-0.012870789,-0.018203735,-0.015655518,-0.020324707,-0.0010185242,0.036346436,0.020584106,-0.037078857,0.016067505,-0.009170532,-0.0036735535,-0.009460449,0.009262085,-0.008934021,-0.045654297,0.006614685,0.028442383,-0.004840851,0.0262146,-0.027526855,-0.007575989,0.03314209,0.0357666,0.037750244,0.0034217834,-0.011642456,0.023086548,-0.0093688965,0.0070114136,-0.012916565,-0.010383606,0.0036010742,0.0056152344,0.010604858,-0.019439697,0.017669678,-0.021377563,0.008010864,-0.00096321106,0.015945435,0.01737976,-0.010658264,-0.0027332306,0.012023926,0.04208374,-0.0055885315,-0.027786255,-0.014709473,0.026489258,0.07733154,-0.00021493435,0.0073013306,0.016113281,0.028442383,0.008651733,0.055267334,0.0017204285,0.022354126,0.015266418,-0.011100769,-0.009254456,0.035247803,-0.0015659332,-0.027145386,0.023971558,-0.04055786,-0.026901245,0.020248413,0.014099121,0.01802063,-0.047607422,-0.0082473755,-0.022827148,-0.04550171,-0.0049057007,-0.005180359,-0.008544922,0.004928589,-0.0039253235,0.020248413,0.0046195984,-0.014480591,-0.0066719055,0.009719849,-0.025848389,-0.054351807,-0.015304565,-0.015609741,0.012107849,-0.042419434,0.0033817291,0.010620117,0.018188477,-0.012313843,-0.0026721954,-0.0012054443,0.02029419,0.02192688,0.009437561,0.012184143,0.0018815994,-0.029769897,-0.022338867,-0.01134491,-0.00223732,0.02583313,-0.012680054,0.020263672,0.029830933,0.008781433,0.00014793873,-0.007785797,-0.0008325577,-0.018173218,-0.023117065,-0.013641357,0.01285553,0.02166748,0.013648987,-0.015380859,0.030563354,-0.0090789795,-0.03164673,0.007118225,0.050720215,0.019104004,0.010719299,-0.011123657,0.002450943,-0.041534424,-0.001206398,0.0028705597,0.0064468384,0.020736694,-0.002155304,-0.004550934,0.020431519,0.001830101,-0.0077171326,-0.00011599064,0.038848877,0.0048599243,0.0063591003,0.02607727,-0.0070533752,-0.0005836487,-0.038726807,-0.026901245,0.011566162,0.04220581,0.015548706,0.010437012,-0.017150879,-0.00032901764,-0.012611389,-0.006843567,0.0022335052,-0.004890442,-0.038238525,-0.016159058,-0.002784729,0.033233643,0.010528564,0.006378174,-0.00881958,0.016403198,-0.020736694,-0.02305603,-0.02128601,0.043670654,-0.0011396408,-0.0284729,-0.0103302,0.013000488,-0.004096985,-0.016662598,-0.0063209534,-0.05960083,-0.018188477,-0.006603241,-0.010147095,0.01033783,0.0026378632,0.012382507,-0.01701355,0.0061187744,-0.0042800903,0.021362305,0.0074310303,-0.012992859,-0.018585205,0.02243042,0.007888794,-0.0033721924,0.02482605,0.015586853,-0.009597778,0.012565613,-0.0070152283,0.00012397766,-0.039978027,0.018814087,0.010101318,-0.005836487,0.016540527,-0.021102905,0.03918457,0.0063972473,0.02029419,-0.019180298,-0.0021781921,0.020858765,-0.025726318,-0.013725281,0.00089788437,-0.006401062,-0.035949707,0.015945435,0.018844604,0.023712158,-0.030288696,0.041748047,-0.016738892,-0.01687622,0.022109985,0.018585205,-0.015129089,-0.005207062,0.027679443,-0.006290436,-0.005706787,-0.0054626465,-0.016662598,-0.011741638,-0.030136108,-0.009628296,-0.018920898,0.008529663,0.029418945,-0.007785797,0.04135132,0.011398315,0.014350891,0.018981934,0.011871338,0.026641846,0.00042152405,0.0440979,0.03543091,-0.017807007,0.01083374,-0.0010175705,-0.021255493,0.008026123,-0.010643005,0.011062622,-0.016601562,0.0038719177,0.011199951,0.012260437,0.016815186,0.008544922,-0.0018911362,0.0066604614,-0.051635742,-0.0129470825,-0.026000977,-0.00097322464,0.038879395,0.014213562,0.015487671,-0.007583618,-0.004562378,0.027526855,0.04034424,-0.009757996,-0.0115737915,0.0022659302,0.013435364,-0.010108948,0.009429932,0.0072021484,-0.024169922,-0.0010213852,-0.0065345764,-0.021392822,0.023605347,-0.0012388229,0.013534546,-0.009117126,-0.02633667,-0.0340271,0.01966858,-0.018447876,-0.0008444786,0.019348145,-0.0013999939,0.017303467,0.008079529,-0.024795532,0.018569946,0.029266357,-0.026306152,0.024520874,0.03149414,0.00021314621,0.0031604767,-0.002614975,-0.03866577,-0.015129089,0.00541687,-0.007041931],"createdAt":"2026-04-18T18:52:41.739Z","updatedAt":"2026-04-27T22:33:20.704Z","lastSeenAt":"2026-04-27T22:33:20.704Z","tsv":"'/api/v1/portfolios/4/performance':42 '/request':11,24 '0.02':10,23,66,102 '000':70 '0x8335':63 '1':164 '20':69 '2913':64 '4':49,184 '402':161 '6':74 'Base USDC API' 'accept':169 'access':116 'advertis':107 'ai/ml':91 'analyt':90 'api':87,109 'application/json':174 'avail':146 'base':8,21,58,71 'behind':35 'bodi':198 'broad':81 'call':104 'catalog':82 'challeng':159 'connect':127 'consum':208 'contact':214 'content':133 'contract':62 'data':3,16,34,45,89,94 'decim':75 'descript':145 'detail':143,219 'doc':120 'document':118,139,203 'endpoint':28,149,151,177 'exampl':140 'experi':212 'field':144 'finance/web3':93 'financial data API' 'gate':86 'host':79 'howev':117 'http':160 'id':183,191 'infer':92 'infrastructur':96 'instant':115 'integr':218 'investment performance' 'json':44 'json-api' 'key':110 'limit':113 'live':153 'lowpaymentfee.com':30,78 'metric':52 'micropay':6,19 'micropayment' 'need':210 'network':9,22,59 'openapi':206 'output':173 'page':119 'path':178 'pay-per-call portfolio' 'payload':141 'payment':53 'paywal':38 'per':67,103 'perform':2,15,33,51 'platform':106 'portfolio':1,14,32,48,182,190 'portfolio analytics' 'portfolio tracking' 'portfolio-performance' 'post':170 'post-method' 'price':99,121 'prompt':129 'protocol':167 'provid':31,77,216 'rate':112 'readm':122 'relat':46 'request':68,171,197 'resourc':41 'return':43,124,155 'schema':138 'settl':55 'span':88 'spec':207 'specif':40,181 'structur':201 'substant':132 'suggest':179 'support':193 'unclear':187 'uniform':100 'unit':72 'usdc':13,26,61 'usdc-base-network' 'use':60 'util':97 'valid':157 'version':163 'via':4,17 'wallet':128 'whether':188 'without':202 'x402':5,18,37,85,158 'x402 finance' 'x402-gated':84 'x402-payment'","prices":[{"id":"f1dc9d8b-dc79-441c-8cf7-17a1703c124c","listingId":"48be48e9-0843-4dbb-af09-8b83fc45c093","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/4/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":"2026-04-18T18:52:41.739Z"}],"sources":[{"listingId":"48be48e9-0843-4dbb-af09-8b83fc45c093","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/4/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:41.739Z","lastSeenAt":"2026-04-27T22:33:20.704Z"}],"details":{"listingId":"48be48e9-0843-4dbb-af09-8b83fc45c093","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/4/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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/4/performance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/4/performance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, and README pages all return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or trading bots","Agent-driven portfolio monitoring with per-request micropayments"],"bestFor":["Developers needing on-demand portfolio performance data without API key management","AI agents that can settle x402 payments on Base for financial data","Low-volume or sporadic access to portfolio analytics at $0.02/call"],"notFor":["High-frequency bulk data retrieval where per-request pricing adds up","Users who need detailed API documentation or schema guarantees before integrating","Non-crypto-native consumers who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.519Z"},"updatedAt":"2026-04-27T22:33:20.704Z"}}