{"id":"490eb463-325c-4339-ae82-b88a1b184c9d","shortId":"y5N5Xt","kind":"x402","title":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request.","tagline":"Portfolio holdings data via x402 micropayment on Base network for $0.02/request.","description":"This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 60. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/portfolios/60/holdings` accepts POST requests and is priced at a maximum of $0.02 per call (20,000 base units of USDC, which has 6 decimals). Payment is settled on-chain via the x402 \"exact\" scheme to a designated wallet address. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation on the site is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data returned after payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","portfolio-holdings","usdc-base-network","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio holdings API","investment holdings","portfolio data","x402 finance API","crypto portfolio","lowpaymentfee","Base USDC API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All doc/pricing/API pages render only 'Connect wallet' with no content","The specific /portfolios/60/holdings endpoint is not listed on the provider's homepage — it may be a demo or placeholder","Response format and fields are completely unknown; no examples available","Portfolio ID 60 is hardcoded in the URL — unclear if other portfolio IDs are accessible"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/60/holdings","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/60/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing. The specific endpoint (/portfolios/60/holdings) is not even listed on the homepage — only generic API categories are shown. The actual data returned is entirely unknown.","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":"2026-04-19T08:46:47.377Z","embedding":[-0.022842407,-0.014282227,0.038909912,0.014320374,0.009666443,-0.024551392,-0.021255493,0.01864624,0.06048584,-0.04724121,0.030334473,-0.051208496,-0.02545166,-0.062561035,0.002319336,0.0010299683,0.014892578,-0.0013141632,-0.046203613,0.06298828,0.030899048,-0.0126571655,-0.0021953583,0.024673462,-0.020858765,0.0037517548,-0.009422302,-0.01890564,-0.032989502,-0.028030396,0.0385437,-0.029403687,-0.00021755695,0.02822876,-0.04296875,0.009567261,0.002193451,0.040374756,0.026412964,0.008270264,0.015838623,-0.05368042,0.027908325,-0.010856628,-0.035583496,0.000112354755,0.043395996,-0.036712646,0.024551392,0.024368286,-0.043426514,-0.008460999,-0.012954712,0.013664246,0.016342163,0.02243042,0.031433105,0.006576538,-0.017364502,0.027374268,0.015235901,-0.046173096,0.018966675,-0.0034160614,0.018295288,0.03527832,-0.026123047,0.057647705,0.010826111,0.072631836,0.025512695,0.041778564,0.010009766,0.011398315,-0.021499634,-0.018417358,-0.008110046,0.04852295,0.0036621094,-0.04449463,-0.010444641,0.007484436,-0.06567383,-0.017059326,-0.03805542,-0.042236328,-0.011833191,0.011123657,-0.062286377,0.037902832,-0.07849121,0.014457703,0.0008792877,0.006290436,0.008201599,-0.05215454,0.012176514,0.03640747,-0.017547607,0.026641846,0.0073165894,-0.021606445,-0.01826477,0.0053367615,0.024536133,0.06591797,0.0021095276,0.045684814,0.0019416809,-0.022521973,-0.05935669,-0.009681702,-0.010520935,0.023651123,0.004962921,-0.0062179565,-0.03970337,0.015655518,-0.026687622,0.014030457,-0.04748535,0.01701355,0.029754639,0.017929077,0.012313843,-0.02784729,-0.015090942,0.0018978119,-0.02458191,-0.036499023,0.0317688,0.0069618225,0.009811401,-0.012710571,-0.022613525,0.0051078796,-0.015792847,-0.024627686,-0.03930664,-0.025527954,0.025390625,-0.043121338,0.052368164,0.006122589,-0.09051514,0.030975342,-0.0184021,0.033111572,-0.00043845177,-0.011627197,0.015159607,0.020431519,-0.007633209,0.008575439,-0.010299683,-0.041778564,-0.026763916,0.023605347,-0.010643005,0.028137207,0.003107071,0.027328491,-0.019943237,-0.006454468,0.0158844,0.021575928,0.003753662,-0.066345215,-0.0680542,-0.031982422,0.018539429,-0.0047721863,-0.010787964,-0.004459381,-0.015548706,-0.05657959,0.010940552,-0.014930725,-0.0003540516,-0.06793213,0.00039196014,-0.03024292,0.029708862,-0.013511658,-0.056732178,-0.00094270706,-0.027328491,0.064697266,0.011062622,0.0340271,0.03894043,0.011566162,0.041931152,0.05230713,-0.024902344,-0.022338867,-0.011306763,0.009376526,-0.0035133362,-0.026641846,0.003780365,-0.0022411346,0.029830933,0.07098389,0.012863159,-0.016448975,0.0039711,-0.039276123,-0.044403076,-0.005821228,0.015686035,0.007247925,-0.03451538,0.011047363,-0.018615723,-0.036468506,0.000013828278,0.03036499,-0.0061073303,0.052093506,0.014167786,0.038513184,0.049041748,0.008338928,-0.035217285,0.052001953,0.017654419,-0.004463196,0.014030457,-0.049713135,0.02798462,0.018127441,-0.01826477,-0.0009393692,0.0005931854,0.011398315,-0.027145386,-0.01637268,0.0037708282,-0.0049934387,0.0010232925,-0.03225708,-0.0055389404,0.01939392,0.007167816,-0.013328552,-0.031402588,-0.0847168,0.030014038,0.020553589,0.042816162,-0.0053367615,-0.012245178,-0.020141602,-0.0115356445,-0.042022705,0.00077438354,0.055603027,-0.038024902,-0.013587952,0.021072388,-0.018005371,-0.045837402,0.0068626404,-0.0034618378,-0.014587402,-0.016403198,0.0036964417,-0.059265137,0.010795593,0.010917664,0.035614014,0.018051147,-0.026916504,-0.0647583,0.008239746,-0.021636963,0.013397217,-0.058135986,0.00024533272,0.012046814,0.022460938,-0.010635376,0.027191162,0.02494812,-0.003648758,0.028747559,0.011413574,-0.0051879883,0.011695862,-0.0061531067,0.014434814,0.03540039,-0.051239014,0.025512695,-0.009857178,0.045898438,-0.031051636,0.033111572,-0.01826477,0.034088135,0.016082764,-0.012046814,-0.08703613,0.03866577,-0.013168335,0.0209198,0.038238525,-0.03768921,-0.02154541,-0.035461426,0.055236816,-0.026000977,0.0032978058,-0.012481689,0.037902832,0.0317688,-0.02192688,-0.043273926,-0.038238525,-0.022323608,-0.022720337,0.021408081,-0.016906738,0.0074272156,-0.0042648315,0.031311035,-0.044036865,-0.009048462,-0.020217896,0.005607605,-0.012550354,-0.008140564,-0.0064430237,-0.020812988,0.01713562,0.006084442,-0.0034999847,0.03289795,0.019805908,0.0178833,-0.0064086914,-0.022598267,-0.014625549,-0.012313843,-0.03967285,0.027420044,0.03692627,-0.0047187805,0.021621704,-0.027496338,-0.009925842,0.023590088,0.010192871,0.027755737,-0.0046081543,-0.0053100586,-0.056884766,-0.08300781,-0.0236969,-0.027679443,0.021347046,0.022994995,-0.00066947937,0.029174805,0.019012451,-0.019378662,-0.05795288,0.033721924,-0.049835205,0.02810669,0.031677246,-0.012489319,-0.0234375,0.0041007996,0.013511658,0.00843811,0.03579712,0.015487671,0.00017976761,0.033233643,0.0021266937,0.01374054,0.015731812,0.025650024,0.007419586,-0.0126953125,0.0051612854,-0.04675293,0.0038452148,0.017807007,-0.0008401871,-0.027252197,-0.06958008,0.018341064,0.017684937,0.05328369,0.021865845,0.019210815,-0.0078048706,-0.047607422,-0.0073547363,-0.04397583,-0.0073509216,-0.04006958,-0.046875,0.011299133,0.009628296,0.017456055,-0.018493652,0.03366089,-0.015602112,0.024719238,-0.031402588,0.05621338,-0.015090942,-0.0104599,-0.0037612915,0.0072364807,0.0357666,0.04385376,-0.027648926,0.03579712,0.010871887,-0.026992798,-0.003993988,0.05001831,-0.028305054,-0.03314209,-0.06842041,-0.045318604,0.0031852722,-0.0013313293,-0.010932922,0.00434494,0.0020275116,0.043518066,0.00010383129,-0.02545166,-0.014457703,0.024749756,-0.001502037,-0.059417725,-0.019180298,-0.036621094,0.0045394897,0.042541504,-0.006717682,-0.016479492,0.0113220215,-0.009811401,0.020889282,0.031433105,0.026870728,0.008666992,-0.024337769,0.014343262,-0.008506775,0.0000062584877,0.008987427,0.03857422,0.031280518,0.0037727356,0.050933838,0.02494812,-0.005542755,-0.05215454,-0.0009212494,-0.06774902,-0.01448822,0.04928589,-0.018875122,0.0017309189,-0.022994995,-0.024383545,0.00881958,0.008171082,-0.03543091,-0.014785767,0.018798828,-0.019119263,-0.029800415,-0.06964111,-0.026412964,0.03491211,0.08508301,0.02130127,0.012924194,-0.021820068,-0.012435913,0.022216797,-0.002571106,0.023361206,-0.014076233,-0.0146865845,-0.025238037,-0.012817383,-0.020812988,-0.020248413,0.025024414,0.033691406,0.008010864,0.0021457672,0.015487671,0.009918213,-0.007335663,-0.021865845,0.0034427643,0.0011377335,0.022491455,-0.0016775131,0.056915283,-0.006008148,-0.027252197,-0.04522705,0.024032593,0.009407043,0.03225708,-0.039978027,-0.004638672,0.014129639,0.008033752,-0.020202637,-0.025115967,0.0062789917,0.009384155,-0.05126953,-0.06021118,0.047424316,-0.014587402,0.0024604797,0.015052795,-0.006290436,0.020263672,-0.013847351,0.022918701,-0.011100769,-0.025909424,-0.026611328,-0.029220581,-0.029037476,-0.04837036,-0.027877808,-0.022338867,0.033935547,-0.019714355,0.044799805,-0.0064735413,-0.02772522,0.033599854,0.030090332,0.028366089,0.014518738,-0.012306213,-0.0023078918,0.036712646,0.01576233,-0.05331421,0.028259277,0.002128601,0.011352539,0.018875122,0.04031372,0.016860962,-0.006214142,0.025924683,-0.008132935,-0.01927185,-0.031463623,-0.013587952,-0.0009784698,0.0052871704,-0.022659302,-0.048706055,0.03994751,0.031951904,-0.03894043,-0.038848877,0.03552246,0.009063721,-0.023590088,0.011360168,0.01474762,0.055999756,-0.020065308,0.0395813,0.008384705,0.03744507,0.020523071,0.0039901733,-0.004512787,0.010147095,-0.010856628,-0.000013887882,0.00894928,-0.011291504,0.022018433,0.0064201355,0.040008545,-0.0073623657,-0.0031490326,-0.025405884,-0.017456055,0.007286072,-0.011054993,-0.016784668,0.035583496,-0.003396988,0.02507019,-0.00013506413,0.025802612,0.036865234,0.0066604614,-0.013511658,-0.009773254,0.036743164,0.002456665,0.017837524,-0.0034713745,-0.0013179779,0.035369873,-0.05795288,-0.006958008,0.019134521,0.016571045,-0.003282547,-0.030166626,-0.026000977,0.008201599,0.027832031,0.0184021,-0.0049972534,0.010261536,0.010932922,-0.024047852,-0.021728516,0.004085541,0.00868988,-0.02911377,-0.062927246,0.0018453598,0.0057907104,0.019622803,-0.0071144104,0.02949524,-0.02067566,-0.0059776306,0.0115356445,-0.036956787,0.006549835,-0.003627777,-0.0140686035,0.004776001,-0.011131287,0.015792847,-0.018508911,-0.052520752,0.01071167,-0.0079422,0.08276367,-0.042053223,0.005279541,-0.0021572113,-0.012565613,0.004459381,0.0040359497,0.02418518,0.039245605,0.019744873,0.05407715,-0.032958984,0.043945312,-0.0289917,0.02243042,-0.007621765,-0.047576904,-0.007083893,-0.010177612,0.006626129,0.047088623,-0.02268982,-0.00042366982,-0.043884277,-0.03189087,-0.012748718,-0.054351807,0.025817871,0.029937744,0.04953003,-0.03137207,0.004722595,0.016616821,0.00907135,0.0005226135,-0.042999268,-0.013328552,0.00069761276,0.0031032562,0.020446777,-0.017028809,-0.009376526,-0.007698059,0.004940033,-0.030670166,-0.029556274,0.0129776,-0.0075035095,-0.015129089,0.026046753,-0.020996094,-0.013404846,0.0012969971,-0.0435791,-0.008834839,-0.012924194,0.011276245,0.009178162,-0.00047373772,-0.015144348,0.028152466,-0.017730713,0.01965332,-0.0055274963,-0.017700195,-0.05114746,-0.010108948,0.0031719208,0.016113281,0.01134491,-0.016799927,-0.0037612915,-0.008728027,-0.061279297,0.00053834915,0.01914978,-0.001876831,0.0058403015,-0.010070801,-0.02192688,0.013343811,-0.033447266,-0.021713257,-0.003293991,-0.0052108765,0.01838684,0.0005993843,0.021133423,0.047943115,-0.011978149,-0.022277832,-0.01586914,0.009124756,0.025222778,0.046417236,0.030639648,-0.022994995,-0.030090332,0.0057296753,-0.013381958,-0.013053894,-0.042236328,0.017150879,-0.009521484,0.016433716,-0.0023918152,0.028671265,-0.02305603,0.01953125,0.05178833,-0.00006759167,-0.0005874634,0.005428314,-0.014030457,0.025360107,0.037017822,-0.037628174,0.007949829,-0.043395996,0.016738892,-0.020431519,0.049041748,-0.0015115738,0.0289917,-0.020309448,-0.011497498,0.0025405884,-0.008613586,-0.0077438354,-0.041137695,-0.023651123,-0.06210327,-0.011169434,-0.0056991577,-0.03491211,0.012680054,0.015014648,-0.020446777,-0.06866455,0.0036087036,0.05596924,-0.0019359589,-0.0051727295,0.0072669983,0.039154053,0.018875122,-0.036010742,-0.02381897,-0.0017948151,-0.03805542,-0.0066833496,-0.04196167,0.021560669,-0.013824463,-0.01701355,0.023025513,0.003709793,0.027618408,-0.010108948,0.03439331,0.002696991,0.000048041344,-0.021575928,0.0012397766,-0.014511108,-0.034423828,0.042236328,-0.035583496,0.024749756,0.03753662,0.019378662,-0.005050659,0.010238647,0.03729248,-0.023132324,0.009223938,0.015808105,0.024978638,0.01789856,-0.009292603,0.015731812,0.015296936,0.012466431,-0.02293396,0.002714157,0.0015544891,-0.028289795,0.000436306,0.03225708,-0.011940002,-0.008834839,0.00087976456,0.018112183,0.0119018555,0.005001068,0.01083374,-0.03894043,-0.005832672,-0.019714355,0.008094788,0.008071899,0.008102417,-0.016860962,0.027175903,0.005241394,0.013786316,-0.0066986084,0.01247406,0.022827148,0.046691895,0.0025691986,-0.0045394897,0.012451172,0.011878967,0.039886475,-0.01361084,0.021636963,-0.043640137,0.00023424625,-0.0033416748,0.017623901,-0.00005596876,-0.032226562,0.013206482,-0.018585205,0.0009622574,-0.011703491,-0.037902832,-0.0126953125,-0.010147095,-0.027420044,-0.014930725,-0.00969696,-0.008811951,0.017700195,0.008460999,-0.0027198792,-0.021011353,0.02645874,-0.0046920776,0.0076789856,0.030410767,0.025146484,-0.009719849,-0.03338623,-0.01739502,-0.012336731,-0.018722534,0.002664566,-0.010818481,-0.013633728,0.029373169,0.028671265,-0.0057907104,0.0018815994,0.04232788,-0.029953003,0.013511658,0.02607727,0.033203125,-0.028411865,0.008911133,-0.02520752,0.015571594,0.0056381226,0.024810791,0.0023040771,-0.019454956,-0.0039520264,0.030029297,0.028076172,-0.0037612915,0.04446411,0.012367249,0.041503906,-0.017623901,-0.0025672913,-0.01889038,-0.0063095093,-0.02330017,-0.0003771782,0.010551453,0.0018119812,0.02053833,-0.0129776,0.00040602684,-0.04071045,0.020126343,0.012672424,0.0256958,-0.04840088,-0.04095459,-0.020431519,0.00016665459,-0.047912598,0.009773254,0.006175995,0.043640137,0.021484375,0.035583496,0.0059051514,0.0048332214,0.02357483,-0.022705078,-0.02532959,-0.005859375,-0.0034503937,0.014053345,-0.0053863525,0.043426514,0.049560547,0.020645142,0.035369873,0.017745972,0.0057258606,0.016342163,-0.0015058517,-0.018798828,0.036895752,-0.011581421,0.017227173,0.015205383,0.024932861,-0.025726318,0.01626587,-0.0012702942,0.027450562,-0.051879883,0.025421143,0.09039307,0.01838684,-0.010787964,0.050933838,-0.020523071,-0.034240723,-0.0021305084,-0.009056091,0.062927246,-0.01637268,0.030593872,0.04345703,0.0030021667,0.0043563843,2.3841858e-7,-0.014785767,-0.035369873,0.050811768,0.03286743,-0.017608643,-0.009307861,-0.0027332306,0.016784668,-0.03491211,-0.029937744,0.008468628,-0.0000346303,0.009490967,-0.0029907227,0.0036811829,-0.019714355,-0.008674622,0.025161743,-0.0058898926,-0.012191772,0.041656494,0.012672424,-0.004272461,0.023117065,-0.013687134,0.034210205,-0.0019874573,-0.009239197,0.013458252,0.010299683,0.01524353,-0.022125244,0.023529053,-0.0143585205,0.028762817,0.04119873,-0.015792847,0.011299133,0.02128601,0.0040740967,-0.005970001,0.03363037,0.016357422,0.009399414,0.03237915,0.0345459,0.0178833,-0.025527954,0.018920898,0.0065574646,0.022369385,-0.013023376,-0.008468628,0.0043144226,-0.021865845,0.02684021,0.005115509,-0.027175903,0.038208008,0.029403687,-0.0046806335,-0.0051498413,-0.014854431,0.033691406,-0.016113281,-0.026565552,-0.011459351,-0.0006155968,0.015586853,0.044769287,0.032684326,-0.013015747,0.03515625,0.02470398,-0.009513855,-0.009017944,0.010978699,-0.017501831,-0.024169922,-0.0030021667,-0.026947021,-0.053527832,0.012840271,-0.0025367737,0.014373779,0.029571533,-0.0043144226,-0.010040283,-0.0071792603,0.013153076,0.0013303757,-0.010047913,-0.007965088,-0.011177063,0.009346008,0.039794922,-0.004711151,0.003604889,-0.011528015,-0.012702942,0.021026611,-0.013801575,-0.017303467,-0.0062675476,0.004058838,-0.03475952,0.005947113,0.01902771,0.001461029,0.07647705,-0.012145996,-0.03060913,-0.003282547,0.026885986,0.0053596497,0.009063721,-0.012207031,0.013282776,-0.038879395,0.042510986,0.036499023,0.0060653687,-0.0013036728,-0.00774765,-0.033843994,0.0026054382,0.002105713,0.01222229,-0.021438599,-0.013153076,-0.0026397705,0.02658081,-0.02418518,-0.032684326,0.010749817,-0.0087890625,-0.01600647,-0.023208618,0.001698494,0.004398346,0.017410278,0.0096206665,0.022079468,-0.026947021,0.06286621,-0.021759033,0.034423828,-0.026565552,0.0028953552,0.04623413,0.014892578,0.041534424,-0.008049011,-0.005001068,-0.022018433,-0.00440979,0.03237915,0.022613525,0.019882202,-0.00157547,-0.00466156,0.034820557,0.00074625015,0.018173218,0.008232117,-0.015792847,0.009025574,-0.01777649,-0.01625061,-0.008872986,-0.008880615,0.01928711,0.015487671,-0.011360168,0.022460938,-0.03326416,-0.00043916702,0.01939392,0.0050086975,0.0021820068,0.0003721714,-0.014892578,0.034576416,-0.025787354,-0.025283813,-0.014091492,-0.001282692,-0.071899414,-0.017929077,0.006652832,0.0146865845,-0.024871826,0.062286377,0.021102905,-0.017059326,0.018371582,0.026809692,-0.001660347,0.030334473,0.004840851,0.04940796,0.0496521,0.011329651,-0.004436493,0.037322998,0.013328552,-0.024719238,0.01309967,0.04837036,0.00598526,0.028823853,-0.0061454773,-0.008544922,0.0016059875,0.0011663437,-0.010551453,-0.0034751892,-0.011077881,0.0005993843,0.004196167,0.02319336,-0.009315491,-0.016723633,-0.021026611,-0.008178711,-0.0027065277,0.04196167,0.015487671,-0.03137207,0.022384644,-0.0049438477,-0.0029144287,0.0027427673,0.008239746,-0.01335907,-0.04055786,0.0016326904,0.020202637,-0.003112793,0.040405273,-0.032073975,-0.011123657,0.024154663,0.03253174,0.02029419,0.013557434,-0.009643555,0.0014238358,0.0039100647,-0.0028266907,-0.018051147,-0.012023926,0.009208679,0.005542755,0.012260437,-0.012390137,0.023071289,-0.020370483,0.000028908253,0.0023231506,0.00932312,0.008804321,-0.0128479,-0.00374794,0.014129639,0.026412964,-0.014633179,-0.02281189,-0.002538681,0.013496399,0.08001709,0.017410278,0.0060272217,0.021499634,0.02822876,0.023910522,0.051818848,0.015960693,0.024627686,0.005870819,-0.009681702,0.005870819,0.03152466,-0.012825012,-0.021575928,0.013153076,-0.039367676,-0.022369385,0.022903442,0.0065078735,0.012878418,-0.038879395,-0.010047913,-0.0050468445,-0.04598999,-0.010604858,-0.008163452,0.0020275116,0.011688232,-0.0023040771,0.02067566,-0.003118515,-0.028076172,-0.013877869,-0.0012359619,-0.020507812,-0.06604004,-0.014457703,-0.026260376,0.01272583,-0.027770996,0.005508423,-0.0024662018,0.022537231,-0.014518738,-0.003709793,-0.0041923523,0.01071167,0.03729248,0.025238037,0.009727478,-0.015014648,-0.040283203,-0.022903442,-0.01940918,-0.0028495789,0.038085938,-0.02104187,0.015472412,0.03564453,-0.0063438416,-0.0061569214,-0.00041747093,0.008346558,-0.0071487427,-0.0054855347,-0.009544373,0.008354187,0.018112183,-0.0004940033,-0.016235352,0.023422241,-0.022583008,-0.03491211,-0.0015554428,0.05307007,0.023269653,0.0146484375,0.005504608,-0.0030918121,-0.05508423,0.008392334,-0.020309448,0.008766174,0.009643555,-0.010444641,0.0075035095,0.016784668,0.022888184,-0.002658844,-0.0023326874,0.041046143,0.03201294,0.016113281,0.017166138,-0.012001038,0.021194458,-0.03338623,-0.015129089,0.009254456,0.05117798,0.022827148,0.0146484375,-0.012718201,-0.010040283,-0.024017334,-0.003227234,0.012954712,-0.020629883,-0.05178833,-0.009887695,-0.0053749084,0.030136108,0.009414673,0.019699097,-0.03189087,0.028411865,-0.018569946,-0.034179688,-0.028411865,0.051757812,0.005596161,-0.029525757,-0.0029850006,0.022781372,-0.0064811707,-0.020401001,-0.00390625,-0.050811768,-0.018127441,-0.018051147,0.008644104,0.032836914,0.00069475174,-0.0012454987,-0.011077881,-0.0028495789,-0.004928589,0.024978638,0.019332886,-0.022598267,-0.009590149,0.013595581,0.013092041,-0.000790596,0.012825012,0.019546509,-0.0006971359,-0.0007791519,-0.010223389,0.0004169941,-0.032470703,0.02180481,0.023040771,-0.006439209,0.03302002,-0.01449585,0.03201294,-0.0033168793,0.018585205,-0.020355225,-0.009025574,0.034240723,-0.026031494,-0.009887695,0.0008301735,-0.0017347336,-0.022842407,0.015319824,0.018875122,0.025680542,-0.028518677,0.038360596,-0.0071792603,-0.022384644,0.0149383545,0.010635376,-0.024154663,-0.0071105957,0.016784668,-0.0035705566,0.0007724762,-0.006587982,-0.02078247,-0.022155762,-0.030563354,-0.0072746277,-0.00674057,0.009239197,0.022033691,-0.0045318604,0.048706055,0.01838684,0.0105896,0.014976501,0.020187378,0.020889282,0.0129776,0.04220581,0.018310547,-0.009185791,0.022705078,-0.0010089874,-0.009185791,0.003835678,-0.015319824,0.022537231,-0.0020713806,0.0015478134,-0.011642456,0.0042915344,0.011543274,0.015548706,-0.0029010773,0.009971619,-0.04537964,-0.013557434,-0.011756897,-0.0007777214,0.025680542,0.015571594,-0.003704071,-0.009140015,-0.010314941,0.034179688,0.04196167,-0.021942139,-0.009140015,-0.014877319,0.01701355,-0.01499176,0.028793335,0.01448822,-0.014419556,-0.014709473,-0.0027885437,-0.013328552,0.014671326,-0.032226562,0.022125244,0.0036334991,-0.020599365,-0.022216797,0.025131226,-0.0055351257,0.003566742,0.014343262,0.010177612,0.025680542,0.012840271,-0.016860962,0.03161621,0.023071289,-0.031585693,0.03955078,0.02368164,-0.010353088,0.012641907,-0.0016374588,-0.040527344,-0.017593384,-0.003528595,-0.014663696],"createdAt":"2026-04-18T18:53:05.567Z","updatedAt":"2026-04-27T21:34:10.176Z","lastSeenAt":"2026-04-27T21:34:10.176Z","tsv":"'/api/v1/portfolios/60/holdings':80 '/request':12,24 '0.02':11,23,91 '000':95 '20':94 '402':195 '6':102 '60':36 'Base USDC API' 'accept':81 'actual':199 'address':119 'ai/ml':58 'analyt':57 'api':54,121,153 'attach':132 'avail':207 'base':8,20,73,96 'behind':66 'broader':42 'call':93 'caller':130 'chain':109 'challeng':196 'commit':127 'confirm':190 'connect':162 'contain':186 'content':168 'crypto portfolio' 'data':3,15,32,56,200 'decim':103 'descript':179 'design':117 'doc':152 'document':144 'endpoint':26,79,188 'exact':113 'exampl':176 'extrem':149 'field':182 'finance/web3':60 'gate':65 'header':137 'hold':2,14,31,184 'id':35 'infer':59 'infrastructur':62 'investment holdings' 'key':122 'limit':124 'live':191 'lowpaymentfee' 'lowpaymentfee.com':28,44 'materi':208 'maximum':89 'micropay':6,18 'network':9,21,74 'no-api-key' 'offer':46 'on-chain':107 'openapi':172 'page':157 'part':39 'pay':51 'pay-per-request':50 'payment':69,104,136,142,203 'per':52,92 'platform':43 'portfolio':1,13,30,34 'portfolio data' 'portfolio holdings API' 'portfolio-holdings' 'post':82 'price':86,154 'prompt':164 'proof':143 'proper':194 'protocol':70 'rate':123 'readm':156 'render':159 'request':53,83 'request/response':175 'requir':129 'respons':185 'return':29,192,201 'schema':173 'scheme':114 'settl':106 'simpli':131 'site':147 'span':55 'spars':150 'specif':78 'substant':167 'unit':97 'unknown':205 'upfront':126 'usdc':76,99 'usdc-base-network' 'use':75 'util':63 'valid':140 'varieti':48 'via':4,16,110 'wallet':118,163 'x':135 'x-payment':134 'x402':5,17,68,112,141 'x402 finance API' 'x402-payment'","prices":[{"id":"3fed3b42-7f80-444b-aadf-74c15f51429c","listingId":"490eb463-325c-4339-ae82-b88a1b184c9d","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/60/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:05.567Z"}],"sources":[{"listingId":"490eb463-325c-4339-ae82-b88a1b184c9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/60/holdings","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:05.567Z","lastSeenAt":"2026-04-27T21:34:10.176Z"}],"details":{"listingId":"490eb463-325c-4339-ae82-b88a1b184c9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/60/holdings \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/60/holdings"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/60/holdings"}],"useCases":["Retrieving holdings data for a specific portfolio via micropayment","Integrating portfolio data into automated trading or analytics agents","Querying investment positions without needing API key registration"],"bestFor":["Agents needing on-demand portfolio holdings data without signup","Developers experimenting with x402 pay-per-call APIs","Low-volume, ad-hoc portfolio data lookups"],"notFor":["High-frequency bulk portfolio data retrieval (no documented batch support)","Users who need detailed API documentation or response schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.363Z"},"updatedAt":"2026-04-27T21:34:10.176Z"}}