{"id":"c3809f76-c9bf-48e2-a67c-6320294a0311","shortId":"zfGehy","kind":"x402","title":"Pay-per-call portfolio data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call portfolio data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com serves portfolio data at `/api/v1/portfolios/1` via HTTP POST. It uses the x402 payment protocol on the Base network, accepting USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header.\n\nThe provider, lowpaymentfee.com, offers a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base.\n\nThe specific endpoint being listed here (`/api/v1/portfolios/1`) is described only as \"Premium API Access\" with no further documentation on request parameters or response schema. The docs, pricing, and API pages on the site require a wallet connection and provide no additional technical detail. Because of this, the exact data returned by this portfolio endpoint is unclear — it likely returns portfolio-related JSON data, but the structure and fields are undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","portfolio-data","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","USDC micropayment API","Base network API","pay-per-request data","lowpaymentfee","crypto portfolio endpoint"],"warnings":["No documentation available — docs/pricing/API pages all require wallet connection and show no content","Request body schema and response schema are completely undocumented","The meaning of 'portfolios/1' (whether '1' is a fixed resource or a portfolio ID) is unclear","No OpenAPI spec or examples provided by the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/1","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on request parameters, response schema, or what 'portfolios/1' actually returns. Docs pages require wallet connection and yield no content. 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":"2026-04-19T08:15:30.068Z","embedding":[0.0010881424,-0.023269653,0.045440674,0.0057792664,0.014823914,-0.021697998,-0.029937744,0.018051147,0.068359375,-0.060577393,0.019348145,-0.039733887,-0.018356323,-0.039855957,-0.008491516,-0.0033245087,0.021240234,0.0020179749,-0.052246094,0.043121338,0.018951416,-0.03277588,-0.021484375,0.013763428,-0.00856781,-0.014785767,-0.021865845,-0.00907135,-0.011070251,-0.04083252,0.039764404,-0.023956299,-0.0011024475,0.012741089,-0.051757812,-0.00592041,0.0057411194,0.0256958,0.03186035,-0.00843811,0.008720398,-0.044158936,0.013137817,-0.0033245087,-0.02319336,-0.013450623,0.024887085,-0.034332275,0.029037476,0.02468872,-0.04196167,-0.021514893,0.0016613007,0.011489868,0.0184021,0.022827148,0.033172607,0.00058460236,0.002527237,0.022628784,0.015731812,-0.051208496,0.012023926,-0.00045990944,-0.0028362274,0.04437256,-0.028030396,0.05480957,-0.00080394745,0.08148193,0.025604248,0.045654297,0.007217407,0.022445679,-0.009742737,-0.015548706,-0.0042152405,0.055114746,-0.0046043396,-0.044952393,0.00217247,0.018493652,-0.052246094,0.0035514832,-0.027404785,-0.0473938,-0.0072669983,0.0064430237,-0.0340271,0.04269409,-0.08746338,-0.01651001,-0.010040283,0.015235901,0.009407043,-0.0018949509,0.013465881,0.032806396,-0.014518738,0.022979736,0.013038635,-0.023468018,0.00045490265,0.0074424744,0.04119873,0.04864502,0.019561768,0.034973145,-0.003396988,-0.013618469,-0.053649902,0.00092697144,-0.014633179,0.021743774,-0.01234436,-0.0026359558,-0.035308838,0.026504517,-0.024108887,0.01889038,-0.05657959,0.017074585,0.026473999,0.013328552,0.026626587,-0.032806396,-0.023895264,0.002281189,-0.0059661865,-0.03942871,0.008407593,0.013191223,0.015357971,-0.011734009,-0.023925781,0.0033435822,-0.024383545,-0.027938843,-0.047027588,-0.0340271,0.035736084,-0.03161621,0.04989624,0.00806427,-0.0859375,0.02571106,-0.015602112,0.028442383,-0.014709473,0.0027580261,-0.013259888,0.024642944,-0.011962891,-0.0008149147,0.0020618439,-0.025650024,0.0015211105,0.010154724,-0.007762909,0.047302246,-0.009613037,0.040618896,0.0023517609,0.0063972473,0.02482605,0.041503906,0.002111435,-0.062683105,-0.08135986,-0.010643005,0.0088272095,-0.029388428,-0.004940033,-0.0077323914,-0.0006875992,-0.08691406,-0.0112838745,-0.012275696,-0.0040359497,-0.03552246,-0.024047852,-0.033813477,0.01020813,-0.009536743,-0.06939697,0.009063721,-0.018615723,0.0597229,0.010047913,0.02571106,0.061340332,-0.009613037,0.046722412,0.04373169,-0.036102295,-0.009864807,-0.007549286,0.0007557869,-0.007358551,-0.0116119385,0.010192871,-0.026153564,0.035003662,0.06185913,0.008056641,-0.013389587,0.0037593842,-0.064086914,-0.028656006,-0.021774292,0.023254395,0.013153076,-0.01928711,0.04196167,-0.016723633,-0.041107178,0.0064888,0.030426025,0.016860962,0.06951904,0.014320374,0.027328491,0.036895752,-0.0044517517,-0.04373169,0.033569336,0.029693604,-0.0016222,-0.0022201538,-0.04852295,0.03274536,0.014884949,-0.0079422,0.008117676,-0.007911682,0.018478394,-0.033721924,-0.006385803,0.015296936,-0.020584106,-0.008575439,-0.039886475,-0.01550293,0.035003662,-0.0039596558,-0.0037326813,-0.024002075,-0.09375,0.025146484,0.033569336,0.04296875,-0.007888794,0.007896423,-0.024734497,0.00242424,-0.05303955,0.022583008,0.060546875,-0.014305115,-0.009086609,0.010414124,-0.010940552,-0.014030457,0.00041103363,-0.0059547424,-0.03894043,-0.021636963,-0.0042266846,-0.0703125,0.026321411,0.018463135,0.027160645,0.031402588,-0.017959595,-0.057922363,0.004802704,-0.013076782,-0.005508423,-0.053649902,-0.011177063,0.0056915283,0.0127334595,-0.0056915283,0.028289795,0.025314331,-0.02204895,0.017837524,0.01977539,-0.008346558,-0.008468628,-0.014945984,0.018203735,0.0042152405,-0.07543945,0.0064048767,-0.0058670044,0.039520264,-0.034729004,0.022125244,-0.016052246,0.029418945,0.040252686,-0.023422241,-0.06088257,0.02659607,0.01184082,0.01210022,0.04397583,-0.027450562,-0.022827148,-0.035888672,0.06463623,-0.018203735,-0.01676941,-0.0024776459,0.024261475,0.023910522,-0.030975342,-0.048736572,-0.023330688,-0.012306213,-0.03805542,0.020263672,-0.011451721,0.0037078857,0.007686615,0.012359619,-0.02029419,-0.011985779,-0.021911621,0.0038490295,-0.008308411,0.010124207,-0.001033783,-0.008049011,0.017120361,-0.002576828,0.004634857,0.0146102905,0.0209198,0.01864624,-0.012565613,-0.030975342,-0.03515625,0.019836426,-0.022964478,0.03466797,0.053466797,0.012214661,0.020721436,-0.021865845,-0.00730896,0.028762817,0.03378296,0.03491211,-0.0030937195,0.004627228,-0.06225586,-0.07727051,-0.03353882,-0.024047852,0.028015137,0.03338623,-0.0030708313,0.027282715,0.021484375,-0.029937744,-0.05645752,0.037597656,-0.04751587,0.021697998,0.05014038,-0.012229919,-0.017074585,-0.0023097992,0.00058174133,-0.006996155,0.047821045,0.0107421875,0.008033752,0.040283203,0.035827637,0.00466156,-0.00059366226,0.020523071,0.017791748,-0.000910759,-0.0015773773,-0.036499023,-0.00039935112,0.005443573,-0.00566864,-0.026947021,-0.083740234,0.029388428,0.039855957,0.07543945,0.039611816,0.019577026,0.010864258,-0.03186035,-0.0048446655,-0.03616333,-0.013313293,-0.03805542,-0.051696777,0.034179688,0.0021686554,0.037719727,-0.020202637,0.040161133,-0.020202637,0.0206604,-0.033599854,0.058532715,0.0024814606,-0.0036296844,0.013793945,0.0017757416,0.041992188,0.06488037,-0.02104187,0.05065918,0.03363037,-0.03277588,0.0020217896,0.060699463,-0.021987915,-0.01914978,-0.058929443,-0.039978027,0.005672455,-0.0012340546,-0.013511658,-0.0019359589,0.008361816,0.026519775,0.01725769,-0.03024292,-0.0007266998,0.010009766,0.00315094,-0.05886841,-0.015686035,-0.033294678,0.0014848709,0.044403076,0.0005559921,-0.022277832,-0.0030956268,-0.023727417,0.01979065,0.0127334595,0.03074646,-0.005672455,-0.01651001,0.025604248,0.0003578663,0.0038433075,0.008804321,0.045654297,0.017028809,0.006877899,0.060455322,0.023254395,-0.015853882,-0.058013916,0.001200676,-0.07147217,-0.0033950806,0.03842163,-0.02470398,-0.008628845,-0.0085372925,-0.028457642,-0.005168915,0.007209778,-0.040740967,0.0049095154,0.016723633,-0.008598328,-0.030349731,-0.07623291,-0.012123108,0.017074585,0.076049805,0.040222168,-0.008453369,-0.0317688,-0.0066375732,0.020507812,0.00043344498,0.047027588,-0.0134887695,-0.017211914,-0.012245178,-0.039886475,-0.0018730164,-0.018096924,0.0127334595,0.012359619,-0.01210022,0.024520874,0.01184845,0.015098572,-0.01058197,-0.006340027,0.014533997,-0.020736694,0.013084412,0.005214691,0.06945801,-0.0033340454,-0.027130127,-0.03967285,0.02305603,0.011642456,0.0234375,-0.038146973,-0.014923096,0.0060653687,-0.0054969788,-0.016571045,-0.027862549,-0.0005478859,0.000746727,-0.05065918,-0.07739258,0.04425049,-0.031051636,0.014595032,0.008384705,-0.009841919,0.00080013275,-0.0062713623,0.013504028,0.008674622,-0.017929077,-0.035827637,-0.038269043,-0.030197144,-0.03253174,-0.021865845,-0.022521973,0.0287323,-0.028442383,0.03753662,-0.008430481,-0.037994385,0.025253296,0.025817871,0.011756897,0.023773193,-0.011779785,0.0049972534,0.03555298,0.006793976,-0.035491943,0.021133423,0.0027580261,0.012260437,0.010070801,0.049468994,0.023864746,-0.010848999,0.016357422,-0.0066070557,-0.02078247,-0.030471802,-0.010246277,-0.010635376,0.015388489,-0.03137207,-0.047546387,0.027786255,0.028411865,-0.035583496,-0.043945312,0.02029419,0.0102005005,-0.02798462,0.03161621,0.017150879,0.033416748,-0.0340271,0.036712646,0.014328003,0.031921387,0.031829834,0.008117676,-0.0056762695,0.0058670044,-0.02607727,0.0006933212,-0.0032405853,0.010528564,0.016174316,0.011054993,0.04095459,0.009315491,0.008773804,-0.018432617,-0.025650024,0.02357483,-0.015312195,-0.014862061,0.02798462,0.022644043,0.016983032,-0.0029563904,0.016647339,0.020477295,0.0021133423,-0.023086548,-0.0061531067,0.02355957,-0.00831604,0.0031375885,0.0028190613,0.0026664734,0.027832031,-0.055267334,-0.008781433,0.010093689,0.0054893494,-0.021499634,-0.037994385,-0.037902832,0.015914917,0.022491455,0.012840271,0.013549805,0.02130127,0.0076446533,-0.014480591,-0.018951416,0.014930725,-0.0063476562,-0.030639648,-0.054107666,0.0001540184,0.010177612,0.0017776489,-0.024612427,0.023406982,-0.018859863,-0.020706177,0.0058784485,-0.027633667,-0.0070648193,0.0053482056,-0.014167786,0.014434814,0.0014886856,0.016738892,-0.014167786,-0.05505371,0.020080566,-0.020248413,0.057434082,-0.056030273,0.022964478,-0.008094788,-0.018081665,0.008094788,0.020263672,0.023025513,0.03845215,0.015510559,0.03591919,-0.045196533,0.04788208,-0.030288696,0.024169922,0.0009784698,-0.051940918,0.00059986115,-0.009284973,-0.010871887,0.058288574,-0.02798462,-0.021530151,-0.04425049,-0.02357483,-0.0138549805,-0.046447754,0.01461792,0.031799316,0.043273926,-0.026885986,0.003025055,0.005180359,0.012550354,-0.01878357,-0.031829834,-0.0068588257,0.004142761,0.0075798035,0.014091492,-0.021743774,-0.012901306,-0.015411377,0.00023651123,-0.03665161,-0.046905518,0.008773804,-0.0069007874,-0.02619934,0.00019943714,-0.018249512,-0.009811401,-0.0023155212,-0.045135498,-0.0015287399,0.008026123,0.018844604,0.0058174133,-0.009994507,-0.0057258606,0.030151367,-0.011993408,0.030776978,0.0015411377,-0.014053345,-0.039978027,0.011062622,-0.0031604767,0.02961731,0.0017471313,-0.016098022,0.0014686584,-0.0209198,-0.072509766,-0.0049972534,0.011695862,-0.022613525,0.017288208,-0.02267456,-0.017868042,0.016281128,-0.02532959,-0.007843018,0.008216858,-0.00039887428,0.0072402954,-0.004673004,0.01550293,0.031051636,-0.0141067505,-0.02142334,0.015312195,0.009216309,0.010650635,0.032409668,0.022598267,-0.023086548,-0.017440796,-0.00038933754,0.009735107,-0.003868103,-0.029342651,0.01436615,-0.011146545,0.0039520264,-0.0049705505,0.016845703,-0.021743774,0.014381409,0.070617676,0.0048828125,-0.029144287,-0.0056610107,-0.023925781,0.02142334,0.03463745,-0.00932312,-0.0024757385,-0.042785645,0.0039596558,-0.013900757,0.05621338,0.011009216,0.032989502,-0.0071525574,-0.018920898,-0.011131287,-0.0044822693,-0.008956909,-0.046447754,-0.020645142,-0.048797607,0.0037651062,-0.02861023,-0.034057617,0.01586914,0.030349731,-0.008087158,-0.06982422,0.0063476562,0.046813965,-0.0018978119,0.017211914,-0.0020103455,0.043670654,0.016601562,-0.027877808,-0.011650085,0.01309967,-0.043304443,-0.005908966,-0.025512695,0.0062217712,-0.014862061,-0.019851685,0.02015686,-0.009353638,0.031219482,-0.012062073,0.025344849,-0.011665344,0.0209198,-0.021453857,0.022827148,-0.00730896,-0.026977539,0.049224854,-0.024368286,0.029922485,0.03253174,0.015571594,0.004348755,0.008811951,0.04296875,-0.036865234,-0.0055503845,0.034240723,0.026519775,0.027023315,-0.009231567,0.022491455,0.024719238,0.0069007874,-0.007686615,-0.0041999817,0.0010671616,-0.039093018,-0.0067253113,0.029388428,-0.017929077,-0.0065994263,-0.026779175,0.016189575,0.007209778,-0.010009766,0.010955811,-0.01789856,-0.005455017,-0.02798462,0.005584717,-0.0026245117,0.003900528,-0.021377563,0.020523071,-0.00003671646,0.013755798,0.009353638,0.0061187744,0.01424408,0.035003662,0.0018997192,0.0017604828,0.01449585,-0.0033950806,0.027664185,-0.0002553463,0.011947632,-0.046081543,-0.0031204224,-0.033294678,-0.013687134,-0.0030937195,-0.022964478,0.0019407272,-0.0138168335,-0.0011129379,-0.006629944,-0.028289795,-0.009674072,-0.009353638,-0.021652222,-0.019470215,-0.01197052,0.0026817322,0.020507812,0.015586853,0.003118515,-0.014717102,0.028030396,-0.0058517456,-0.004486084,0.025741577,0.025894165,-0.00390625,-0.034118652,-0.0066375732,-0.019073486,-0.01436615,0.00756073,-0.021835327,-0.012077332,0.035827637,0.0054512024,-0.0041885376,0.022232056,0.03942871,-0.027633667,0.014221191,0.0077171326,0.021621704,-0.032928467,0.010498047,-0.034118652,0.025970459,0.01637268,0.020187378,0.0014343262,-0.022766113,-0.02557373,0.020523071,0.014770508,-0.009498596,0.04901123,0.018173218,0.032806396,-0.010787964,-0.0019836426,0.00223732,-0.018218994,-0.006061554,0.03665161,0.007396698,0.009552002,0.0035762787,-0.012435913,0.0008878708,-0.030151367,0.028884888,0.0067443848,0.010421753,-0.043029785,-0.04446411,-0.030395508,0.004173279,-0.0446167,0.010116577,-0.00033164024,0.036712646,0.022018433,0.037139893,0.023880005,0.004081726,0.008087158,-0.036499023,-0.023971558,-0.004016876,-0.010986328,0.023757935,-0.0041275024,0.0335083,0.060577393,0.0058937073,0.02911377,0.040802002,0.004219055,0.011978149,-0.00060129166,-0.026672363,0.019622803,0.00356102,0.013076782,0.027130127,0.042907715,-0.026626587,0.02381897,0.011444092,0.02305603,-0.04083252,0.03640747,0.080322266,0.023269653,-0.016296387,0.045074463,-0.0020179749,-0.03488159,-0.006969452,-0.019683838,0.059631348,-0.0062942505,0.03564453,0.054351807,0.005580902,-0.007358551,-0.009925842,-0.02748108,-0.037841797,0.05847168,0.029006958,-0.009239197,-0.0107040405,-0.020233154,-0.0025558472,-0.049926758,-0.04324341,0.009796143,0.0040664673,0.014793396,-0.019073486,-0.0037841797,-0.03237915,0.002752304,0.024749756,0.0025138855,-0.018432617,0.03677368,0.032165527,-0.007972717,0.018005371,-0.017578125,0.04360962,-0.0037460327,-0.021118164,0.020828247,0.022277832,-0.0026302338,-0.017791748,0.017791748,-0.014556885,0.03543091,0.047943115,-0.021194458,0.002817154,0.03439331,0.0017709732,-0.015411377,0.035827637,0.023727417,0.015625,0.045654297,0.039489746,0.023834229,-0.03186035,0.019989014,0.0037593842,0.0041542053,-0.011192322,-0.009857178,0.007160187,-0.02180481,0.017410278,-0.008232117,-0.037109375,0.03225708,0.027160645,0.0020523071,-0.00059747696,-0.005924225,0.019927979,-0.016036987,-0.0149002075,0.011413574,0.006011963,0.032684326,0.027709961,0.036956787,-0.0078125,0.024261475,0.016036987,-0.019424438,-0.016983032,0.022857666,-0.024780273,-0.0039863586,0.00034594536,-0.012336731,-0.053466797,0.031463623,0.007522583,0.008575439,0.025421143,-0.008781433,-0.009994507,0.005706787,0.011703491,-0.0028648376,-0.0030555725,-0.0019111633,-0.021774292,0.023620605,0.03955078,-0.005504608,0.028305054,-0.0099487305,-0.01209259,-0.0031909943,-0.002500534,-0.030395508,-0.018188477,-0.0012569427,-0.025665283,0.00033450127,0.019241333,0.010345459,0.060546875,-0.0018310547,-0.02041626,0.004070282,0.024398804,0.0075302124,0.008842468,0.00066900253,0.0018005371,-0.020706177,0.042144775,0.031585693,0.014083862,0.021148682,-0.023605347,-0.020935059,-0.015930176,0.009109497,0.028961182,-0.010765076,-0.0008406639,-0.0013189316,0.029144287,-0.018081665,-0.040405273,0.01838684,-0.0138168335,-0.023590088,-0.030715942,0.0048599243,0.00039672852,0.02949524,0.025924683,0.021408081,-0.036987305,0.061157227,-0.01902771,0.034606934,-0.017791748,-0.01977539,0.041503906,0.025405884,0.032073975,0.004802704,0.0037841797,-0.039794922,0.0012845993,0.046417236,0.015945435,0.021484375,-0.0009832382,-0.01449585,0.019699097,-0.0006942749,0.015548706,-0.005607605,0.0043144226,0.012420654,-0.017593384,-0.0019836426,-0.0056266785,0.011985779,0.00944519,0.0206604,-0.007522583,0.01928711,-0.027633667,-0.0018367767,0.029891968,0.0023956299,0.013900757,0.003967285,-0.03265381,0.034179688,-0.021820068,-0.03503418,-0.010795593,0.00048446655,-0.06530762,-0.018478394,0.0032043457,0.011383057,-0.014961243,0.04925537,0.009757996,0.0010433197,0.018295288,0.03363037,-0.015472412,0.029006958,-0.006881714,0.039794922,0.03543091,-0.005504608,-0.014434814,0.015808105,0.01399231,-0.016845703,0.020904541,0.05050659,-0.003967285,0.024002075,-0.009887695,0.0051879883,-0.0027313232,0.0017290115,-0.012779236,0.0026226044,-0.0082092285,-0.00365448,-0.008255005,0.015510559,-0.014221191,-0.007461548,-0.016143799,-0.012130737,0.010627747,0.038482666,0.0259552,-0.034088135,0.002456665,-0.0068588257,0.014404297,-0.00089263916,-0.0112838745,-0.011276245,-0.045440674,0.004951477,0.020065308,-0.0066833496,0.039276123,-0.028686523,0.003293991,0.02368164,0.0209198,0.045654297,0.01096344,-0.013427734,0.01209259,-0.0060806274,-0.0066833496,-0.019622803,-0.0017414093,0.006832123,0.012519836,0.011131287,-0.023895264,0.023361206,-0.03024292,0.0143585205,0.008224487,-0.0030879974,0.018722534,-0.014144897,-0.0061683655,0.015464783,0.030471802,-0.0035171509,-0.031341553,-0.0020370483,0.01285553,0.07458496,-0.0053215027,0.0032596588,0.02204895,0.014793396,0.01687622,0.056365967,0.012229919,0.023117065,0.017211914,-0.024261475,0.0049476624,0.039367676,0.0013036728,-0.024047852,0.02079773,-0.023025513,-0.019241333,0.028213501,0.019073486,0.0067749023,-0.026519775,-0.007865906,-0.021270752,-0.037841797,0.005607605,-0.015449524,0.00029206276,0.000110030174,-0.007904053,0.0011768341,-0.010749817,-0.030548096,-0.016159058,0.0079193115,-0.0061454773,-0.06567383,-0.015716553,-0.031829834,0.009254456,-0.03201294,0.0023422241,-0.012573242,0.035064697,-0.024642944,0.008041382,-0.0024375916,-0.0020275116,0.02810669,0.014434814,0.01889038,-0.016082764,-0.029693604,-0.01737976,-0.0053367615,-0.00356102,0.032714844,-0.006916046,0.011489868,0.033203125,-0.0055389404,-0.002166748,-0.008392334,-0.01864624,-0.014968872,-0.014907837,-0.009552002,0.0124053955,0.01739502,0.0027008057,-0.017669678,0.030227661,-0.02368164,-0.031921387,0.0078125,0.05783081,0.012687683,0.01828003,-0.0129776,-0.0015687943,-0.025405884,0.013664246,-0.012298584,0.0067634583,0.02268982,-0.0036716461,0.0015735626,0.008331299,0.014671326,-0.0046691895,-0.008132935,0.03491211,0.016174316,-0.00011694431,0.038024902,-0.010574341,0.000729084,-0.02558899,-0.013336182,0.009048462,0.04940796,0.026382446,0.01737976,-0.0014533997,-0.0062217712,-0.01763916,0.009010315,-0.009605408,-0.009284973,-0.045898438,-0.018508911,-0.01007843,0.019500732,0.00096416473,0.007827759,-0.008224487,0.014503479,-0.025375366,-0.03527832,-0.024353027,0.041107178,0.008094788,-0.018356323,-0.011077881,0.0039749146,0.007865906,-0.0085372925,-0.008666992,-0.05215454,-0.0234375,-0.0027675629,-0.008178711,0.0132369995,0.0042686462,0.012771606,-0.008682251,0.00182724,-0.0037403107,0.0032901764,0.022216797,-0.028137207,-0.004524231,0.02999878,0.0066566467,-0.010498047,0.012245178,0.0027484894,0.0026950836,0.011993408,-0.0027923584,-0.0015869141,-0.04055786,0.028366089,0.007904053,-0.006702423,0.039916992,-0.010643005,0.017333984,-0.010498047,0.019485474,-0.013870239,-0.0023403168,0.039093018,-0.03552246,-0.01953125,0.004283905,-0.0015487671,-0.03451538,0.010482788,0.011131287,0.031066895,-0.01701355,0.04449463,-0.0001887083,-0.01675415,0.017501831,0.017471313,-0.010314941,-0.0019359589,0.024642944,0.0006008148,0.004386902,-0.0016126633,-0.01586914,-0.025848389,-0.020980835,-0.0027313232,-0.0029201508,0.0047836304,0.026947021,0.00579834,0.05279541,0.004512787,0.009552002,0.02507019,0.012802124,0.020599365,0.0055618286,0.039276123,0.014823914,-0.02305603,0.017318726,-0.00017690659,-0.0075035095,-0.012939453,-0.0068969727,0.00605011,-0.017333984,0.0067214966,0.0034046173,0.025527954,0.0040397644,0.01977539,-0.009498596,-0.00032877922,-0.050750732,-0.028305054,-0.014503479,0.0030288696,0.03149414,0.0032043457,0.016494751,0.0060310364,-0.009963989,0.023025513,0.024368286,-0.014480591,-0.0107421875,-0.005252838,0.013084412,-0.0032444,0.022705078,0.021697998,-0.013023376,-0.012458801,0.0035915375,-0.02243042,0.015808105,-0.0066184998,0.017089844,-0.0032024384,-0.015045166,-0.022994995,0.026779175,-0.01977539,-0.012786865,0.0066566467,0.014091492,0.036254883,0.015792847,-0.012420654,0.01751709,0.026306152,-0.029144287,0.044525146,0.024032593,0.0064735413,-0.00029301643,-0.0044937134,-0.055358887,-0.008895874,-0.005168915,-0.0041236877],"createdAt":"2026-04-18T18:52:14.052Z","updatedAt":"2026-04-28T07:34:37.674Z","lastSeenAt":"2026-04-28T07:34:37.674Z","tsv":"'/api/v1/portfolios/1':46,158 '/request':17,34 '0.02':16,33,69,141 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':63 '20':72 '6':77 'Base network API' 'USDC micropayment API' 'accept':60 'access':165 'addit':192 'ai/ml':113 'analysi':116 'analyt':112 'api':80,109,164,180 'base':9,26,58,74,151 'base-network' 'broader':102 'call':4,21,108 'catalog':103 'classif':118 'connect':188 'contract':62 'convers':134 'cost':67 'crypto portfolio endpoint' 'data':6,23,44,111,200,215 'decim':78 'describ':160 'detail':194 'doc':177 'document':169 'embed':119 'enabl':38 'endpoint':7,24,39,137,154,205 'estim':128 'exact':199 'exchang':123 'feed':122 'field':220 'finance/web3':120 'gas':127 'generat':135 'geocod':132 'handl':89 'header':96 'http':48 'infer':114 'infrastructur':130 'inlin':90 'json':214 'key':81 'like':209 'limit':84 'list':139,156 'lowpaymentfee' 'lowpaymentfee.com':41,99 'maximum':66 'model':149 'network':59 'no-api-key' 'no-rate-limit' 'offer':100 'page':181 'paramet':172 'pay':2,19,106 'pay-per-cal':1,18,105 'pay-per-call' 'pay-per-request data' 'payment':54,87,95,148 'per':3,20,70,107,142 'portfolio':5,22,43,204,212 'portfolio API' 'portfolio-data' 'portfolio-rel':211 'post':49 'premium':163 'price':121,178 'protocol':55 'provid':98,190 'quot':126 'rate':83,124 'relat':213 'request':71,143,171 'requir':86,185 'respons':174 'return':201,210 'schema':175 'sentiment':115 'serv':42 'settl':12,29 'site':184 'span':110 'specif':153 'structur':218 'summar':117 'technic':193 'token':125 'unclear':207 'undocu':222 'unit':75 'usdc':14,31,61 'usdc-settlement' 'use':51 'util':131 'valid':133 'via':10,27,47,91 'wallet':187 'x':94 'x-payment':93 'x402':11,28,37,53,147 'x402 portfolio' 'x402-enabled':36 'x402-payment'","prices":[{"id":"ace547f4-9dd9-4fc0-913f-841a930b56e1","listingId":"c3809f76-c9bf-48e2-a67c-6320294a0311","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:14.052Z"}],"sources":[{"listingId":"c3809f76-c9bf-48e2-a67c-6320294a0311","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:14.052Z","lastSeenAt":"2026-04-28T07:34:37.674Z"}],"details":{"listingId":"c3809f76-c9bf-48e2-a67c-6320294a0311","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/1 \\\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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/1"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/1"},{"claim":"All endpoints 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":"Provider offers additional API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving portfolio data on-demand with per-call USDC micropayments","Agent-driven portfolio lookups without managing API keys","Integrating low-cost financial data into automated workflows"],"bestFor":["Agents or bots that need keyless, pay-as-you-go portfolio data access","Developers experimenting with x402 payment protocol on Base","Low-volume consumers who want no subscription commitments"],"notFor":["High-volume bulk data consumers who need flat-rate pricing","Users who need detailed API documentation or guaranteed SLAs","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.856Z"},"updatedAt":"2026-04-28T07:34:37.674Z"}}