{"id":"7f402e97-b63b-44b9-9ba9-b51144f56da2","shortId":"JjBt7W","kind":"x402","title":"x402-gated portfolio data endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated portfolio data endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (portfolio ID 32) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment is made via the x402 \"exact\" scheme with no API keys, rate limits, or subscriptions required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader lowpaymentfee.com platform advertises a range of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities. All endpoints are listed at $0.02 per request and settle on the Base network using USDC. However, the specific endpoint being listed here (/api/v1/portfolios/32) is not explicitly described on the site's landing page, so its exact response schema and data contents are unclear. It appears to be a portfolio-related data resource, but no documentation, example responses, or OpenAPI schema are available.\n\nThe site's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no substantive documentation, making it impossible to verify the response format or data quality. Callers should be aware that this is a minimally documented endpoint with no published output schema beyond the x402 challenge metadata indicating it returns application/json.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","portfolio-data","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call data","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The /api/v1/portfolios/32 endpoint is not listed among the site's advertised APIs","No output schema or example response is available; response format is unknown","No OpenAPI or machine-readable API specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/32","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the specific /portfolios/32 resource is not described anywhere on the site. The docs/pricing/API pages are all empty beyond a wallet connect prompt. This is effectively a stub listing.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T08:37:03.323Z","embedding":[-0.0030574799,-0.010040283,0.040924072,0.0011692047,0.014915466,-0.011833191,-0.017105103,0.010795593,0.07159424,-0.062805176,0.031799316,-0.059692383,-0.03186035,-0.042755127,-0.0054359436,-0.0025100708,0.025115967,-0.0037117004,-0.060760498,0.05770874,0.02432251,-0.016342163,-0.02357483,0.020507812,-0.012802124,0.0034065247,-0.012710571,-0.0020256042,-0.020217896,-0.023010254,0.024841309,-0.023910522,-0.00068616867,0.007774353,-0.029830933,0.00015568733,0.00035905838,0.04232788,0.020233154,0.00390625,0.014038086,-0.03817749,0.021469116,-0.005596161,-0.0073165894,-0.009346008,0.031921387,-0.04626465,0.02532959,0.0049476624,-0.036712646,-0.013664246,-0.01423645,0.027160645,0.009391785,0.019226074,0.026107788,-0.011352539,0.008300781,0.031463623,0.0047569275,-0.051086426,-0.0053100586,0.014099121,0.010299683,0.039276123,-0.030532837,0.053863525,-0.011108398,0.091674805,0.010131836,0.05633545,0.030258179,0.010398865,-0.007247925,-0.026565552,-0.008651733,0.029449463,-0.0030441284,-0.046417236,-0.00045084953,0.0008134842,-0.055847168,-0.0076789856,-0.025650024,-0.05935669,-0.011413574,0.020309448,-0.04220581,0.049621582,-0.094055176,-0.0059509277,-0.010139465,0.017318726,-0.017318726,-0.007194519,0.00868988,0.023284912,-0.0022125244,0.02130127,0.0046653748,-0.02458191,0.01008606,0.012527466,0.049468994,0.038635254,0.014480591,0.042297363,-0.0054893494,-0.021652222,-0.036376953,-0.00856781,-0.013313293,0.022750854,-0.0018882751,-0.022323608,-0.022888184,0.03375244,-0.020248413,0.024551392,-0.061584473,0.03161621,0.019470215,0.00083494186,0.025650024,-0.022033691,-0.02861023,-0.004047394,-0.023971558,-0.0362854,0.0135269165,0.0051651,-0.0016956329,-0.020706177,-0.015457153,0.011489868,-0.025817871,-0.031021118,-0.05532837,-0.014732361,0.02748108,-0.035705566,0.041229248,0.015266418,-0.091552734,0.025680542,-0.020523071,0.04324341,-0.019042969,0.005130768,0.008552551,0.027389526,-0.003353119,0.010437012,-0.0029830933,-0.048736572,-0.022628784,0.014198303,0.009857178,0.0317688,-0.0042152405,0.028808594,0.023910522,0.0032806396,0.029647827,0.0390625,-0.012321472,-0.06665039,-0.0703125,-0.020950317,0.0068969727,-0.00793457,-0.012649536,0.0024051666,0.0036392212,-0.0847168,-0.021240234,0.00047707558,0.012367249,-0.044189453,-0.029571533,-0.03982544,0.014305115,-0.015472412,-0.050445557,0.009933472,-0.011413574,0.039276123,0.009468079,0.024749756,0.051605225,0.0037193298,0.04977417,0.043670654,-0.027359009,-0.016403198,0.0060577393,-0.005554199,-0.0006942749,-0.0060577393,0.013130188,-0.0105896,0.03543091,0.049713135,-0.0073547363,-0.0149383545,0.015548706,-0.06829834,-0.026855469,-0.020736694,0.03805542,0.017120361,-0.04107666,0.022827148,-0.014862061,-0.036346436,0.01235199,0.024887085,0.020050049,0.06719971,-0.002166748,0.038604736,0.032562256,0.0006041527,-0.036468506,0.040985107,0.019515991,0.0044288635,-0.00004285574,-0.04510498,0.027664185,0.014801025,-0.013427734,-0.012710571,-0.016601562,0.0059280396,-0.035705566,-0.020080566,0.017333984,-0.028839111,-0.0031108856,-0.032928467,-0.012428284,0.017120361,-0.006088257,-0.0058403015,-0.03427124,-0.07476807,0.02394104,0.0395813,0.024963379,-0.006965637,0.009506226,-0.029418945,-0.0024204254,-0.049835205,0.023773193,0.054260254,-0.0071372986,-0.032714844,0.024841309,-0.009788513,-0.019622803,-0.005897522,-0.017700195,-0.020080566,-0.022644043,-0.0014266968,-0.06304932,0.024154663,0.022628784,0.024658203,0.031219482,-0.021270752,-0.061828613,0.0046920776,-0.023162842,-0.0054244995,-0.055023193,-0.013832092,0.016967773,0.016494751,0.00038790703,0.023620605,0.016693115,-0.0023784637,0.02168274,0.026672363,-0.008621216,-0.0040740967,-0.0103302,0.018630981,0.012054443,-0.066467285,0.01701355,-0.013946533,0.03933716,-0.039245605,0.025650024,-0.014709473,0.028549194,0.037841797,-0.030303955,-0.05999756,0.006465912,0.0059394836,0.029144287,0.054351807,-0.0118637085,0.0014591217,-0.04034424,0.040374756,-0.016143799,-0.0076293945,-0.0034332275,0.032440186,0.04043579,-0.0138549805,-0.04534912,-0.030670166,-0.00283432,-0.030792236,0.0289917,-0.0025100708,0.01979065,-0.004009247,0.018966675,-0.018325806,-0.0037441254,-0.023284912,-0.00907135,-0.013145447,0.002696991,0.0013341904,-0.008361816,0.00831604,0.0011720657,0.0055160522,0.014503479,0.00919342,0.0102005005,-0.006954193,-0.026794434,-0.0390625,0.009254456,-0.03475952,0.028625488,0.044952393,0.017990112,0.013374329,-0.026870728,-0.016860962,0.016815186,0.021255493,0.04385376,-0.0054626465,0.0009889603,-0.057769775,-0.07525635,-0.026565552,-0.018798828,0.031173706,0.03189087,0.0026054382,0.027008057,0.028198242,-0.018249512,-0.059051514,0.04675293,-0.04788208,-0.0036258698,0.042816162,-0.025726318,-0.026565552,0.004886627,0.018173218,0.009231567,0.04736328,0.011299133,0.013847351,0.05114746,0.023590088,0.008743286,-0.012748718,0.029159546,0.014266968,-0.0055503845,-0.008850098,-0.035949707,-0.001958847,0.008033752,-0.0209198,-0.03677368,-0.088134766,0.036499023,0.026168823,0.082214355,0.026260376,0.023239136,0.014595032,-0.037719727,-0.0071144104,-0.043060303,-0.016464233,-0.04046631,-0.041534424,0.03237915,0.0009660721,0.033447266,-0.035705566,0.035736084,-0.025100708,0.015640259,-0.030334473,0.06628418,-0.012535095,-0.0023345947,0.007648468,0.014961243,0.04663086,0.07330322,-0.020080566,0.036956787,0.025939941,-0.01676941,0.0009608269,0.03994751,-0.0051956177,-0.019546509,-0.067993164,-0.04107666,-0.0055732727,-0.0055122375,-0.028152466,-0.015777588,-0.0003979206,0.036987305,0.0033054352,-0.022598267,-0.011009216,0.012741089,0.014137268,-0.053497314,-0.014884949,-0.050445557,0.011497498,0.046905518,0.0062561035,-0.01625061,-0.00699234,-0.018463135,0.01651001,0.034362793,0.0073280334,-0.0003232956,-0.028121948,0.022994995,-0.0038204193,0.009735107,0.013542175,0.045532227,0.03918457,0.0055351257,0.057861328,0.028305054,-0.00642395,-0.05633545,0.0018167496,-0.061279297,-0.0014076233,0.023803711,-0.018737793,-0.004310608,-0.013168335,-0.027313232,0.0032196045,0.024887085,-0.035614014,0.008644104,0.026138306,-0.014007568,-0.043151855,-0.07421875,-0.03451538,0.017105103,0.081604004,0.018859863,0.0129776,-0.030136108,-0.012588501,0.016220093,-0.010917664,0.037963867,-0.013870239,-0.01260376,-0.00920105,-0.027999878,-0.018814087,-0.019165039,0.03540039,0.00025224686,-0.011795044,0.013168335,0.000521183,0.013961792,-0.0060310364,-0.0109939575,0.007724762,-0.011947632,0.009681702,-0.008132935,0.060516357,-0.0016269684,-0.027618408,-0.046722412,0.039611816,-0.0016336441,0.026931763,-0.041870117,-0.01373291,0.009689331,-0.000746727,-0.026824951,-0.031707764,-0.0012388229,0.01373291,-0.04321289,-0.091552734,0.034606934,-0.017822266,0.010231018,0.01272583,-0.008125305,0.011604309,-0.014961243,0.010284424,-0.0051498413,-0.019927979,-0.026489258,-0.043273926,-0.030410767,-0.041259766,-0.026107788,-0.028320312,0.030029297,-0.027557373,0.030227661,-0.0138549805,-0.045959473,0.034606934,0.03741455,0.010871887,0.022491455,-0.007774353,0.006904602,0.03543091,0.0049095154,-0.041137695,0.024261475,-0.0007019043,0.003921509,0.01902771,0.057861328,0.015296936,-0.011756897,0.019943237,-0.006313324,-0.03152466,-0.03955078,-0.015220642,-0.008598328,0.018692017,-0.016723633,-0.038970947,0.028930664,0.024780273,-0.029266357,-0.04510498,0.01687622,0.0287323,-0.03616333,0.020202637,0.006038666,0.030670166,-0.04067993,0.020095825,0.0008368492,0.03125,0.022567749,0.0074768066,0.0006146431,0.00047445297,-0.030258179,-0.003358841,0.013412476,-0.011726379,0.0060310364,0.013465881,0.03387451,0.004951477,0.013160706,-0.022125244,-0.025299072,0.008857727,-0.0088272095,-0.024917603,0.039916992,0.009849548,0.019500732,0.006565094,0.023040771,0.021469116,-0.013046265,-0.008865356,-0.015411377,0.025543213,0.0025196075,0.014350891,0.008361816,0.009925842,0.025299072,-0.050476074,-0.009719849,0.00894165,0.008216858,-0.014457703,-0.04534912,-0.028121948,-0.01398468,0.029876709,0.008544922,-0.00504303,0.018432617,0.0064353943,-0.0071372986,-0.01676941,0.0054855347,0.0064811707,-0.027404785,-0.05883789,-0.010696411,0.0104599,0.007194519,-0.022979736,0.025405884,-0.029067993,-0.026290894,0.0041999817,-0.032165527,-0.00013577938,0.00036215782,-0.0014886856,0.018600464,-0.0020618439,0.017913818,-0.015808105,-0.054656982,0.018920898,-0.020553589,0.07904053,-0.05633545,0.021194458,0.0041542053,-0.018463135,-0.0045814514,0.0112838745,0.016174316,0.040618896,0.0071258545,0.035827637,-0.035369873,0.04385376,-0.024017334,0.014839172,0.0044784546,-0.047698975,-0.015655518,-0.022262573,-0.0042915344,0.046295166,-0.022018433,-0.018234253,-0.041381836,-0.022705078,-0.014419556,-0.044555664,0.025756836,0.021835327,0.044525146,-0.029693604,-0.0029773712,0.01209259,0.009407043,-0.013046265,-0.036865234,-0.0046195984,0.011070251,0.013771057,0.01600647,-0.03265381,-0.008460999,0.0023860931,0.018218994,-0.045806885,-0.03778076,0.0008010864,-0.0011062622,-0.023788452,0.01449585,-0.012329102,-0.018661499,-0.016036987,-0.03286743,-0.006225586,0.005722046,0.019088745,0.018798828,-0.015449524,-0.011146545,0.025604248,-0.029724121,0.019622803,-0.0033016205,-0.013847351,-0.050323486,0.004825592,-0.002029419,0.025466919,-0.011146545,-0.024597168,0.008644104,-0.028839111,-0.06463623,-0.0056114197,0.011642456,-0.016220093,0.016220093,-0.021362305,-0.03692627,0.0047416687,-0.027252197,-0.002313614,0.004016876,-0.008865356,0.0072517395,-0.0042266846,0.01272583,0.031921387,-0.013618469,-0.026031494,0.006248474,0.009727478,0.014770508,0.035949707,0.021606445,-0.01977539,-0.021270752,0.0061187744,-0.00021910667,0.00047636032,-0.030593872,0.025039673,-0.016204834,0.00198555,0.0038146973,0.01259613,-0.026870728,0.021118164,0.054473877,0.0005979538,-0.009864807,0.000351429,-0.017150879,0.024551392,0.042144775,-0.014884949,0.0010824203,-0.04043579,0.013168335,-0.0017595291,0.041381836,-0.00040555,0.020721436,-0.0012569427,-0.018234253,-0.010040283,0.007648468,0.009712219,-0.04647827,-0.0158844,-0.05130005,0.0034675598,-0.03567505,-0.032989502,0.008872986,0.020065308,-0.020248413,-0.0713501,0.0034542084,0.055786133,0.007896423,0.018249512,0.00020241737,0.04623413,0.0178833,-0.015655518,-0.011192322,0.010040283,-0.04748535,-0.010231018,-0.027816772,0.023590088,-0.020431519,-0.0259552,0.016235352,0.0027770996,0.019577026,-0.007068634,0.032440186,-0.00730896,0.015655518,-0.01626587,0.006072998,-0.007381439,-0.029083252,0.0435791,-0.026107788,0.03894043,0.02670288,0.023208618,0.0016241074,0.017929077,0.041229248,-0.041015625,-0.012863159,0.03881836,0.022216797,0.026748657,-0.0042037964,0.026519775,0.012741089,0.013244629,-0.015655518,-0.012664795,-0.014289856,-0.037872314,-0.01285553,0.020233154,-0.018966675,-0.013450623,-0.024108887,0.009284973,0.014266968,0.014457703,0.0038642883,-0.031219482,0.00094890594,-0.0259552,0.004917145,-0.000975132,0.0031166077,-0.015808105,0.020767212,0.006252289,0.015655518,0.005050659,0.010238647,0.008636475,0.036712646,0.0036830902,0.002483368,0.008201599,0.01953125,0.026519775,0.0025749207,0.027435303,-0.044799805,-0.022033691,-0.01977539,-0.014137268,-0.0059127808,-0.021102905,0.011955261,-0.0071144104,0.010093689,-0.0074310303,-0.039398193,-0.012489319,-0.022201538,-0.02166748,-0.0064353943,-0.008926392,0.007270813,0.01637268,0.0029239655,-0.0031528473,-0.017715454,0.027404785,-0.0066986084,-0.011734009,0.02659607,0.035003662,-0.017578125,-0.034088135,0.001991272,-0.020980835,-0.027404785,0.0072402954,-0.010848999,-0.008605957,0.033416748,0.0088272095,0.00042033195,0.017150879,0.031463623,-0.016433716,0.013694763,0.013122559,0.021148682,-0.035736084,0.02130127,-0.03564453,0.027023315,0.017684937,0.023895264,0.0047035217,-0.020050049,-0.017791748,0.02708435,0.025741577,-0.0036811829,0.045410156,0.012954712,0.038604736,-0.008270264,-0.004676819,-0.003068924,-0.008804321,-0.013465881,0.023132324,0.005332947,0.014808655,0.0041122437,-0.0058670044,0.0011882782,-0.04095459,0.017318726,0.016326904,0.008239746,-0.048858643,-0.05114746,-0.0078048706,0.0025482178,-0.04348755,0.013092041,0.00730896,0.03604126,0.038879395,0.02305603,-0.0015907288,0.0058784485,0.0045814514,-0.04269409,-0.019546509,-0.00020802021,-0.013580322,0.024307251,-0.01902771,0.034454346,0.060913086,0.0062026978,0.04046631,0.0362854,0.014381409,0.0035572052,0.004299164,-0.020446777,0.032196045,-0.012077332,0.014007568,0.019515991,0.043518066,-0.029418945,0.01461792,-0.006259918,0.021728516,-0.02999878,0.019729614,0.0803833,0.03387451,-0.0051994324,0.051452637,-0.007686615,-0.031799316,-0.015777588,-0.015571594,0.059753418,-0.007858276,0.029159546,0.04046631,0.013847351,-0.013618469,-0.011100769,-0.012893677,-0.034362793,0.027664185,0.040771484,-0.006832123,0.0034542084,-0.012359619,0.014137268,-0.04611206,-0.019500732,0.017303467,0.008094788,0.020309448,-0.01977539,0.002878189,-0.027175903,0.0027694702,0.010971069,0.0016098022,-0.019607544,0.03805542,0.015670776,-0.0033302307,0.021118164,-0.006755829,0.03555298,-0.0038433075,-0.014877319,0.0066184998,0.02178955,0.005176544,-0.013320923,0.019821167,-0.0022125244,0.028381348,0.039794922,-0.02130127,-0.009521484,0.031799316,0.0061035156,-0.016296387,0.034057617,0.015419006,0.014709473,0.04534912,0.035217285,0.02268982,-0.025405884,0.012954712,-0.007259369,0.008979797,-0.010688782,-0.012382507,0.021713257,-0.0209198,0.008018494,-0.005001068,-0.030380249,0.040252686,0.024795532,-0.001077652,-0.0067443848,0.004196167,0.020935059,-0.012260437,-0.017929077,-0.0056152344,0.010177612,0.026565552,0.03527832,0.04324341,-0.009880066,0.03604126,0.016067505,-0.024108887,-0.013511658,0.018173218,-0.025894165,-0.016662598,-0.0047683716,-0.018753052,-0.052490234,0.026016235,0.0014305115,0.01133728,0.016571045,-0.010528564,-0.007381439,0.0012454987,0.013641357,0.018859863,-0.011833191,0.00084877014,-0.018432617,0.0059814453,0.040985107,-0.01374054,0.004425049,-0.012886047,-0.0032958984,0.011131287,-0.0008239746,-0.021911621,-0.011108398,0.0045700073,-0.03463745,0.005996704,0.016738892,0.012672424,0.064941406,-0.010940552,-0.015167236,-0.0035190582,0.028549194,0.003458023,0.0035438538,-0.0012245178,0.008384705,-0.027786255,0.041381836,0.025253296,0.00541687,0.019622803,-0.014190674,-0.019622803,-0.021484375,-0.000030994415,0.023117065,-0.013084412,-0.011833191,-0.005962372,0.029266357,-0.026565552,-0.03955078,0.008399963,-0.021362305,-0.022781372,-0.02748108,0.011314392,-0.0011501312,0.024230957,0.021270752,0.026473999,-0.02949524,0.057769775,-0.019577026,0.0335083,-0.02545166,-0.006275177,0.04977417,0.022338867,0.044189453,0.009063721,0.000050365925,-0.03250122,-0.0016365051,0.023788452,0.015838623,0.023971558,-0.0038452148,-0.012260437,0.022277832,-0.008834839,0.01701355,0.0017499924,0.0069618225,0.019897461,-0.020385742,0.0044288635,-0.014656067,0.01626587,0.014198303,0.036376953,-0.015472412,0.011291504,-0.02671814,-0.0050201416,0.028320312,0.012519836,0.009887695,-0.0041236877,-0.02571106,0.028305054,-0.020843506,-0.033172607,-0.0017127991,0.009162903,-0.06719971,-0.016525269,0.0052108765,0.011764526,-0.031097412,0.053741455,0.011474609,-0.0031661987,0.019226074,0.037231445,-0.006629944,0.041412354,-0.010429382,0.044128418,0.04812622,-0.0048217773,-0.014007568,0.027511597,0.017333984,-0.016723633,0.031021118,0.048797607,0.009269714,0.030822754,-0.010498047,0.0016403198,-0.002773285,0.009140015,-0.024429321,0.009017944,-0.017715454,-0.0074691772,0.004600525,0.019241333,-0.012718201,-0.011909485,-0.009292603,-0.007106781,-0.0032196045,0.04107666,0.017822266,-0.030715942,0.0124435425,-0.00484848,0.01826477,-0.008811951,-0.012359619,-0.0036258698,-0.041625977,0.0035572052,0.026779175,-0.0007147789,0.031463623,-0.0289917,0.0013170242,0.03829956,0.018371582,0.0418396,0.018707275,-0.015930176,0.009223938,-0.015037537,0.00070381165,-0.01626587,0.0010480881,0.011672974,0.012245178,0.012565613,-0.025466919,0.015106201,-0.026748657,0.007698059,0.013046265,0.012214661,0.030838013,-0.01663208,0.00086307526,0.015960693,0.034820557,-0.011787415,-0.03375244,-0.016357422,0.022598267,0.07501221,-0.007827759,0.006526947,0.0154953,0.03314209,0.02444458,0.049743652,0.019241333,0.02067566,0.022964478,-0.018493652,-0.011604309,0.04046631,-0.005504608,-0.02130127,0.032196045,-0.031555176,-0.01713562,0.025604248,0.012672424,0.005794525,-0.036346436,-0.003993988,-0.029296875,-0.038208008,0.00023496151,-0.0138168335,-0.006160736,-0.005592346,-0.0044021606,0.022537231,-0.00919342,-0.015945435,-0.027175903,0.0076522827,-0.015151978,-0.066711426,-0.011375427,-0.020736694,0.008781433,-0.032440186,0.020355225,-0.01235199,0.029144287,-0.012168884,0.0046424866,0.003358841,-0.0013132095,0.015266418,0.0087509155,0.0138168335,-0.012130737,-0.024658203,-0.010726929,0.004348755,-0.0014591217,0.04168701,-0.027938843,0.012786865,0.032318115,-0.005710602,-0.0015649796,-0.008705139,-0.026260376,-0.007385254,-0.029876709,-0.02053833,0.017440796,0.013694763,0.0047683716,-0.01524353,0.033843994,-0.020233154,-0.030563354,0.007827759,0.044433594,0.020370483,0.015037537,-0.0027809143,-0.0030536652,-0.04437256,0.0057792664,-0.01461792,-0.0023708344,0.025970459,-0.0065231323,0.007041931,0.02217102,0.009849548,-0.0006599426,0.0040130615,0.037628174,0.026138306,0.0025520325,0.038024902,-0.0131073,0.001291275,-0.0309906,-0.00907135,0.002374649,0.053100586,0.010948181,0.020996094,-0.009063721,-0.007987976,-0.008972168,0.008964539,-0.0031719208,-0.0135269165,-0.03967285,-0.02267456,-0.0034999847,0.02015686,0.012313843,0.004348755,-0.0022697449,0.016494751,-0.025253296,-0.03451538,-0.026290894,0.041412354,0.009895325,-0.01826477,0.0006303787,0.015655518,0.005207062,-0.023849487,-0.008865356,-0.055633545,-0.022842407,-0.023788452,-0.013847351,0.013160706,0.002960205,0.0071372986,-0.014556885,0.0059890747,-0.008361816,0.004173279,0.016036987,-0.025512695,0.0016670227,0.027664185,0.012756348,-0.006954193,0.019729614,0.00843811,0.0039253235,0.00522995,-0.0037155151,0.003063202,-0.031829834,0.026016235,0.020080566,-0.010971069,0.025039673,-0.023895264,0.023132324,-0.016784668,0.0049209595,-0.020309448,-0.00699234,0.024017334,-0.030593872,-0.020523071,-0.00091838837,-0.0029125214,-0.035858154,0.0025539398,0.00894165,0.018310547,-0.021316528,0.051208496,-0.0085372925,-0.021148682,0.017059326,0.02218628,-0.0087509155,0.004371643,0.024154663,-0.0039901733,0.0033302307,-0.0042152405,-0.0071144104,-0.013298035,-0.025527954,-0.009124756,-0.020080566,0.00945282,0.025344849,0.010604858,0.05432129,0.0014677048,0.012199402,0.022750854,0.008972168,0.019760132,0.006298065,0.035583496,0.018157959,-0.026641846,0.01335907,0.0071258545,-0.016952515,0.0017271042,-0.0029468536,0.011024475,-0.022338867,0.010322571,-0.0022296906,0.014083862,0.018295288,0.0066604614,0.0007252693,0.0059165955,-0.04324341,-0.01461792,-0.020996094,0.0017976761,0.031463623,0.018463135,0.015014648,-0.00198555,-0.022140503,0.023361206,0.021011353,-0.017181396,-0.017120361,-0.007068634,0.0049552917,-0.012794495,0.014785767,0.016311646,-0.021530151,-0.013893127,-0.009292603,-0.014343262,0.0118255615,-0.0059547424,0.028045654,0.0054397583,-0.014633179,-0.024230957,0.019836426,-0.020507812,-0.0064315796,0.01939392,0.01096344,0.025817871,0.013755798,-0.025604248,0.00881958,0.031433105,-0.043518066,0.033081055,0.021240234,0.00006723404,-0.0056648254,-0.007858276,-0.051330566,0.0053749084,-0.010147095,-0.005710602],"createdAt":"2026-04-18T18:52:37.531Z","updatedAt":"2026-04-27T22:33:20.563Z","lastSeenAt":"2026-04-27T22:33:20.563Z","tsv":"'/api/v1/portfolios/32':164 '0.02':70,146 '000':72 '20':71 '32':42 '402':55 '6':78 'Base network API' 'USDC micropayment API' 'access':34 'advertis':114 'ai/ml':126 'analysi':129 'analyt':125 'api':90,122,211 'appear':186 'application/json':259 'attach':99 'avail':204 'awar':238 'base':8,22,63,73,153 'base-network' 'beyond':251 'broader':111 'call':121 'caller':97,235 'challeng':56,254 'classif':131 'connect':217 'content':182 'cost':66 'crypto':135 'data':5,19,124,137,181,193,233 'decim':79 'describ':168 'doc':208 'document':197,223,244 'embed':132 'endpoint':6,20,30,49,142,160,245 'exact':86,177 'exampl':198 'explicit':167 'financ':133 'format':231 'gate':3,17 'header':104 'howev':157 'id':41 'imposs':226 'indic':256 'infer':127 'infrastructur':139 'json-response' 'key':91 'land':173 'limit':93 'list':144,162 'live':51 'lowpaymentfee' 'lowpaymentfee.com':32,112 'made':82 'make':224 'market':136 'metadata':255 'minim':243 'network':64,154 'openapi':201 'output':249 'page':174,212 'pay':10,24,119 'pay-per-cal':118 'pay-per-call data' 'pay-per-request':9,23 'payment':46,58,80,103,108 'per':11,25,67,120,147 'platform':113 'portfolio':4,18,38,40,191 'portfolio API' 'portfolio-data' 'portfolio-rel':190 'price':209 'prompt':219 'proof':109 'protocol':47 'provid':33 'publish':248 'qualiti':234 'rang':116 'rate':92 'relat':192 'render':214 'request':12,26,68,148 'requir':57,96 'resourc':39,194 'respons':178,199,230 'return':53,258 'schema':179,202,250 'scheme':87 'sentiment':128 'settl':150 'simpli':98 'site':171,206 'span':123 'specif':37,159 'subscript':95 'substant':222 'summar':130 'unclear':184 'unit':74 'usdc':14,28,60,76,156 'usdc-settlement' 'use':155 'util':140 'valid':107 'verifi':228 'via':43,83 'wallet':218 'x':102 'x-payment':101 'x402':2,16,45,85,253 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"136649c5-0cb9-4940-8b6d-05cc0d63a585","listingId":"7f402e97-b63b-44b9-9ba9-b51144f56da2","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:37.531Z"}],"sources":[{"listingId":"7f402e97-b63b-44b9-9ba9-b51144f56da2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:37.531Z","lastSeenAt":"2026-04-27T22:33:20.563Z"}],"details":{"listingId":"7f402e97-b63b-44b9-9ba9-b51144f56da2","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/portfolios/32\n# Response: 402 with x402 challenge JSON\n# 2. Construct an X-PAYMENT header with a valid USDC payment proof on Base\n# 3. Resend the POST with the header:\ncurl -X POST https://lowpaymentfee.com/api/v1/portfolios/32 \\\n  -H \"X-PAYMENT: <payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32"},{"claim":"The site advertises all endpoints at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/32"},{"claim":"Docs, pricing, and API pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Integrating pay-as-you-go data access into autonomous agents","Accessing financial portfolio information without API key management"],"bestFor":["Agents or services that can settle x402 payments on Base","Use cases requiring keyless, per-request API access","Developers experimenting with x402 payment protocol integrations"],"notFor":["Users needing well-documented APIs with published schemas and examples","High-volume consumers who need bulk pricing or subscription plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.679Z"},"updatedAt":"2026-04-27T22:33:20.563Z"}}