{"id":"a0a94c81-8701-4b49-a5fa-0aa311e0b301","shortId":"gbwNJ4","kind":"x402","title":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio transaction data via the x402 payment protocol. The specific resource `/api/v1/portfolios/54/transactions` accepts POST requests and charges up to $0.02 per call in USDC on the Base network. Payment is handled inline via the x402 header challenge — no API keys or accounts are required.\n\nThe broader lowpaymentfee.com platform advertises a range of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all at a uniform $0.02 per request. However, the specific endpoint listed here targets portfolio 54's transactions, which appears to be a finance-related resource. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the exact request body schema, response format, and the nature of the portfolio data are unknown.\n\nThe endpoint is live and returns a valid x402 challenge (version 1) with USDC (contract 0x8335…2913) on Base. The payment scheme is \"exact\" with a max amount of 20000 base units (i.e., $0.02 given USDC's 6 decimals). Timeout is 300 seconds. No OpenAPI spec or detailed documentation is available, so integrators will need to experiment with the POST body to determine accepted parameters.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-transactions","post-endpoint","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 finance endpoint","USDC pay-per-call API","lowpaymentfee API","Base network API","crypto portfolio data","transaction history API"],"warnings":["No API documentation available — all doc/pricing/readme pages are empty stubs showing only 'Connect wallet'","Request body schema is completely unknown; no OpenAPI or example payloads provided","The specific portfolio ID (54) is hardcoded in the URL with no explanation of what it represents","Response format is undocumented — integrators must discover it experimentally"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/54/transactions","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/54/transactions","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 spec, no request/response schema, and no explanation of what portfolio 54 represents or what parameters the POST body accepts. All doc pages return only 'Connect wallet' with no content.","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":"2026-04-19T08:45:04.120Z","embedding":[-0.023040771,-0.017211914,0.041259766,-0.005264282,0.00843811,-0.010826111,-0.01701355,0.008430481,0.06719971,-0.053100586,0.028579712,-0.045928955,-0.03768921,-0.04611206,-0.00724411,0.0049934387,0.017822266,0.013755798,-0.057861328,0.055877686,0.028198242,-0.05291748,-0.010887146,0.011917114,-0.024124146,-0.0051002502,-0.0181427,-0.0067825317,-0.043792725,-0.03604126,0.04736328,-0.02267456,-0.0026454926,0.0096588135,-0.040771484,0.012245178,0.0001989603,0.047821045,0.033813477,-0.006259918,0.03186035,-0.05065918,0.006954193,-0.01486969,-0.015777588,0.002363205,0.024841309,-0.042053223,0.037506104,0.009460449,-0.028198242,-0.0135269165,-0.0012588501,0.033813477,0.016326904,0.011917114,0.028045654,-0.008049011,0.015129089,0.030166626,-0.013999939,-0.05029297,0.01058197,0.0012254715,0.0051879883,0.046569824,-0.035705566,0.057159424,-0.008232117,0.07678223,0.0007634163,0.046081543,0.025146484,0.015205383,-0.0003156662,-0.022445679,-0.01247406,0.042266846,-0.011711121,-0.049591064,-0.0031375885,-0.00894165,-0.06762695,-0.014717102,-0.028152466,-0.061950684,-0.009887695,0.007827759,-0.04473877,0.033813477,-0.079589844,0.012466431,0.0023765564,0.020736694,-0.019561768,-0.023956299,-0.003704071,0.017532349,-0.00447464,0.023071289,0.011802673,-0.025527954,0.018295288,0.0037670135,0.041259766,0.02192688,0.021484375,0.0519104,-0.026855469,-0.01309967,-0.046447754,0.0016584396,-0.0134887695,0.018066406,0.0043792725,-0.024414062,-0.022888184,0.024353027,-0.018600464,0.023330688,-0.060333252,0.021881104,-0.0020618439,-0.0014667511,-0.0007162094,-0.03845215,-0.020812988,0.0014162064,-0.034973145,-0.023284912,0.020645142,-0.0034103394,-0.012924194,-0.0068359375,-0.009483337,0.0006451607,-0.031555176,-0.008934021,-0.05154419,-0.017868042,0.030548096,-0.042816162,0.036315918,0.01675415,-0.10003662,0.033325195,-0.020187378,0.045196533,-0.015525818,-0.0046195984,0.016052246,0.017852783,-0.012214661,0.0026855469,0.01058197,-0.05105591,-0.0138168335,0.028396606,0.004173279,0.025512695,-0.0046920776,0.027160645,0.013175964,0.013442993,0.034454346,0.034484863,-0.0027179718,-0.052246094,-0.073791504,-0.018234253,0.025222778,-0.02619934,-0.020004272,-0.00024676323,-0.009048462,-0.09942627,-0.020584106,-0.011833191,-0.002286911,-0.04940796,-0.017700195,-0.03173828,0.00674057,-0.008415222,-0.07336426,0.0036792755,-0.010864258,0.055480957,0.020889282,0.02708435,0.045135498,0.009719849,0.041290283,0.04812622,-0.016906738,-0.0345459,-0.0047416687,-0.0037269592,0.023895264,-0.009513855,0.016799927,-0.026550293,0.025146484,0.057037354,-0.008010864,-0.018844604,0.013015747,-0.061431885,-0.04559326,-0.021484375,0.031799316,0.009986877,-0.03161621,0.019210815,-0.018356323,-0.030563354,0.011886597,0.027435303,0.0066566467,0.061401367,0.004890442,0.029174805,0.026275635,-0.008361816,-0.020751953,0.053710938,0.030792236,0.0075149536,-0.0050201416,-0.06439209,0.027420044,0.020828247,-0.021377563,-0.01725769,0.0027427673,0.011245728,-0.024475098,-0.0034332275,0.021896362,-0.021743774,-0.0032539368,-0.018371582,-0.0010871887,0.022155762,-0.0029182434,-0.001083374,-0.039398193,-0.084228516,0.030334473,0.043395996,0.025817871,-0.0067825317,-0.01612854,-0.01802063,0.0009150505,-0.04928589,0.034088135,0.039886475,-0.024642944,-0.015449524,0.022644043,-0.0234375,-0.020339966,-0.009689331,-0.02758789,-0.020553589,-0.0107421875,-0.0137786865,-0.0602417,0.019973755,0.026031494,0.020721436,0.023757935,-0.0138168335,-0.06817627,-0.007217407,-0.01586914,0.018737793,-0.044891357,-0.02909851,0.019378662,0.026779175,-0.013641357,0.028869629,0.009338379,0.0020446777,0.014511108,0.021057129,0.016052246,-0.0064735413,-0.024719238,0.018249512,0.010726929,-0.057159424,0.008666992,-0.0000641942,0.027435303,-0.03894043,0.036834717,-0.029510498,0.010978699,0.025390625,-0.016708374,-0.06512451,0.013465881,0.013717651,0.0284729,0.041992188,0.0035438538,0.005191803,-0.032104492,0.052612305,-0.012336731,-0.013038635,0.012428284,0.026168823,0.037109375,-0.011711121,-0.053619385,-0.023498535,-0.004272461,-0.03274536,0.034606934,0.0051078796,0.027420044,0.0028247833,0.018066406,-0.019561768,-0.012458801,-0.030212402,-0.0028877258,-0.017501831,-0.0032024384,-0.016174316,-0.021728516,0.012756348,-0.0124435425,0.0006322861,0.014083862,0.034240723,0.009994507,0.0008544922,-0.026382446,-0.027709961,-0.0049095154,-0.02230835,0.035858154,0.03857422,0.0057754517,0.015525818,-0.027999878,-0.018875122,0.02192688,0.018798828,0.040893555,0.007949829,-0.0066070557,-0.053863525,-0.075805664,-0.029403687,-0.016281128,0.028289795,0.03012085,0.00062417984,0.035125732,0.023620605,-0.012130737,-0.050323486,0.05239868,-0.029556274,0.020599365,0.053253174,-0.018356323,-0.026763916,0.0079193115,0.009841919,-0.0027122498,0.03930664,0.018005371,0.023910522,0.050567627,0.026107788,0.02142334,-0.000936985,0.02178955,0.019607544,-0.0021572113,-0.013420105,-0.027557373,-0.018432617,0.0028820038,-0.027496338,-0.02947998,-0.06878662,0.034698486,0.020431519,0.10192871,0.033111572,0.012077332,0.011444092,-0.028778076,-0.004425049,-0.03338623,-0.022857666,-0.0368042,-0.031021118,0.03048706,0.017120361,0.020446777,-0.036315918,0.035186768,-0.011222839,0.012878418,-0.028945923,0.06933594,-0.007484436,-0.021224976,0.007980347,0.013710022,0.042816162,0.06225586,-0.012832642,0.025543213,0.031951904,-0.032196045,0.0051078796,0.037109375,-0.017684937,-0.015060425,-0.04812622,-0.031204224,0.0042686462,-0.010688782,-0.014465332,-0.015670776,0.016342163,0.04586792,0.010894775,-0.019348145,-0.020843506,0.014144897,0.014694214,-0.029388428,-0.0043258667,-0.047546387,0.01625061,0.049621582,-0.019699097,-0.011116028,-0.003458023,-0.01637268,0.01991272,0.027740479,0.009841919,-0.010124207,-0.019256592,0.039093018,-0.012619019,0.021820068,0.012924194,0.036132812,0.042297363,0.0029468536,0.045928955,0.022232056,-0.019958496,-0.051635742,-0.004634857,-0.07312012,0.005130768,0.035186768,-0.015167236,0.003660202,-0.019256592,-0.036743164,0.00856781,0.021438599,-0.015686035,0.0032978058,0.00970459,-0.01939392,-0.043029785,-0.05795288,-0.017669678,0.015274048,0.07098389,0.023086548,0.00046896935,-0.033569336,-0.0012454987,0.048706055,-0.00023663044,0.017745972,-0.013771057,-0.015823364,-0.015625,-0.027923584,-0.021057129,-0.0034103394,0.030197144,0.0158844,-0.006542206,0.018493652,-0.0016088486,0.0014448166,-0.0012016296,-0.015396118,0.0021953583,-0.013366699,0.006095886,-0.0037193298,0.051605225,-0.010856628,-0.0423584,-0.052215576,0.018356323,-0.009017944,0.03552246,-0.036071777,-0.022399902,0.016098022,0.010543823,-0.025405884,-0.03201294,-0.003627777,0.0105896,-0.040405273,-0.07720947,0.042999268,-0.010932922,0.016555786,0.015625,-0.005558014,0.013595581,-0.030059814,0.013160706,-0.0029659271,-0.025512695,-0.033203125,-0.051757812,-0.028625488,-0.03994751,-0.009269714,-0.03237915,0.025680542,-0.025787354,0.026626587,-0.022415161,-0.04135132,0.034118652,0.01158905,0.0132751465,0.02418518,0.0008125305,0.019104004,0.036132812,-0.0009160042,-0.03378296,0.013122559,-0.0016450882,-0.0054855347,0.0030536652,0.054016113,-0.0016422272,-0.016555786,0.027557373,-0.0020217896,-0.01335144,-0.03363037,-0.019577026,-0.0014858246,0.009796143,-0.0021152496,-0.026397705,0.029556274,0.023468018,-0.04159546,-0.050872803,0.01979065,0.01953125,-0.036193848,0.028152466,0.023147583,0.031143188,-0.022476196,0.026046753,0.0038471222,0.048461914,0.030822754,0.0070877075,-0.0013208389,0.01398468,-0.008270264,0.011177063,0.007484436,-0.003452301,0.0013074875,0.0042304993,0.029174805,0.0051574707,0.016983032,-0.02456665,-0.031829834,0.0075645447,-0.012290955,-0.022338867,0.030136108,-0.00064229965,0.02835083,-0.0023040771,0.023925781,0.0309906,-0.0098724365,-0.0041999817,-0.014289856,0.022277832,0.012435913,0.015396118,0.0076026917,0.004600525,0.028900146,-0.05557251,-0.008972168,0.023757935,0.0065612793,0.0033187866,-0.05532837,-0.036224365,0.0016174316,0.02293396,0.0046195984,0.003490448,0.016021729,0.0069847107,-0.019577026,-0.0076408386,0.0031776428,0.0059165955,-0.022033691,-0.05307007,-0.016845703,0.010658264,0.006652832,-0.022735596,0.028823853,-0.028930664,-0.02267456,0.006904602,-0.035125732,-0.0003633499,-0.013305664,-0.0033855438,0.0317688,-0.00038695335,0.011413574,-0.012573242,-0.048950195,0.00844574,-0.010604858,0.06616211,-0.044006348,0.03012085,-0.011001587,-0.02003479,-0.0035743713,0.015991211,0.01777649,0.039916992,0.009216309,0.046295166,-0.034820557,0.048095703,-0.010864258,0.0063552856,0.00089120865,-0.05078125,-0.015426636,-0.010681152,-0.01612854,0.054718018,-0.027740479,-0.011192322,-0.038208008,-0.021118164,-0.0046195984,-0.055847168,0.016677856,0.020126343,0.049346924,-0.031555176,0.00021398067,0.003414154,0.010818481,-0.0044517517,-0.030776978,-0.008934021,0.0020484924,0.016845703,0.015335083,-0.02104187,-0.0023880005,-0.0028877258,0.000080645084,-0.055999756,-0.05090332,0.0063972473,0.007724762,-0.023208618,0.015083313,-0.012237549,-0.01878357,-0.009437561,-0.047698975,-0.009895325,-0.0069465637,0.022598267,0.0038394928,-0.009284973,-0.013290405,0.012817383,-0.015205383,0.019683838,-0.007156372,-0.0135269165,-0.048339844,0.011169434,0.0042419434,0.032806396,-0.016067505,-0.033691406,0.0065689087,-0.017242432,-0.046173096,-0.011047363,-0.0019025803,-0.019744873,0.009765625,-0.019363403,-0.03086853,0.0069618225,-0.042785645,-0.019622803,-0.0027675629,-0.018951416,0.011192322,-0.016998291,0.020202637,0.027816772,-0.020233154,-0.022598267,0.00006389618,0.009223938,0.009346008,0.026885986,0.043518066,-0.018188477,-0.02268982,-0.008804321,-0.01651001,-0.008125305,-0.039520264,0.01675415,-0.01889038,-0.0033721924,-0.0068473816,0.01838684,-0.027709961,0.023651123,0.06262207,0.006038666,-0.0027885437,0.009086609,-0.014389038,0.022628784,0.042297363,-0.017303467,0.009109497,-0.043151855,0.016998291,-0.011978149,0.061279297,0.0076026917,0.018249512,-0.009765625,-0.028442383,-0.000436306,0.002105713,0.008453369,-0.038482666,-0.02015686,-0.05178833,0.009162903,-0.022750854,-0.029205322,0.013114929,0.030853271,-0.017730713,-0.089660645,-0.0069351196,0.054016113,0.0021381378,0.01600647,-0.007987976,0.038269043,0.031219482,-0.016571045,-0.007843018,0.005657196,-0.049987793,0.0047187805,-0.032165527,0.023666382,-0.028289795,-0.010810852,0.014640808,-0.014183044,0.02267456,-0.0026683807,0.032287598,-0.008964539,0.014549255,-0.020233154,0.010269165,-0.008392334,-0.032440186,0.039367676,-0.031280518,0.049713135,0.034454346,0.039367676,0.001709938,0.023117065,0.033477783,-0.045013428,0.0029335022,0.033325195,0.011779785,0.030014038,-0.008575439,0.024978638,0.014640808,0.024017334,-0.01083374,-0.012649536,-0.0016536713,-0.03253174,-0.011581421,0.026168823,-0.018707275,-0.020126343,-0.036865234,0.008163452,0.022079468,0.019577026,-0.006790161,-0.02935791,-0.011276245,-0.0259552,0.0068359375,0.017623901,0.0023651123,-0.009536743,0.026168823,-0.0007071495,0.016464233,-0.0015974045,-0.0079193115,0.0071640015,0.029891968,0.0031757355,-0.00674057,0.009178162,0.0073509216,0.012107849,-0.0033550262,0.023834229,-0.043640137,-0.021728516,-0.0059814453,-0.006275177,0.00040316582,-0.014770508,0.008270264,-0.010566711,0.001036644,-0.015457153,-0.033081055,-0.014350891,-0.013450623,-0.019454956,-0.013519287,-0.007980347,0.0053749084,0.024612427,0.0110321045,-0.0016040802,-0.022338867,0.025970459,0.0019741058,-0.018035889,0.02041626,0.020370483,-0.017120361,-0.03668213,0.0033569336,-0.029312134,-0.02003479,0.0059127808,-0.009788513,0.00052309036,0.0184021,0.012168884,-0.013160706,0.021270752,0.026504517,-0.01423645,0.020599365,0.008987427,0.0064926147,-0.035705566,0.02456665,-0.046173096,0.032958984,0.015548706,0.013519287,0.0036468506,-0.0236969,-0.022720337,0.025375366,0.02116394,-0.0033226013,0.030334473,0.0074005127,0.040771484,-0.009605408,-0.006690979,-0.00056266785,-0.02279663,-0.010551453,0.013542175,0.0008945465,0.009178162,0.0051231384,-0.023330688,-0.014587402,-0.042419434,0.01701355,0.009605408,0.013389587,-0.04458618,-0.038208008,-0.008514404,-0.011711121,-0.040222168,0.0067443848,0.0012292862,0.03768921,0.048736572,0.022140503,0.0010967255,0.015686035,0.0105896,-0.037902832,-0.025009155,0.0049057007,0.0015821457,0.019058228,-0.020874023,0.04046631,0.06719971,-0.0029449463,0.036865234,0.03704834,0.01638794,0.004470825,0.011703491,-0.024765015,0.04168701,-0.012939453,0.0031642914,0.009353638,0.033966064,-0.017196655,0.013671875,-0.0015916824,0.019424438,-0.03765869,0.023345947,0.08929443,0.031066895,-0.002828598,0.044128418,-0.008110046,-0.023223877,-0.017562866,-0.0132369995,0.04244995,-0.018493652,0.029632568,0.03152466,0.009635925,-0.0057754517,-0.0015325546,-0.0010700226,-0.034240723,0.037628174,0.030670166,0.009292603,0.0025939941,-0.024429321,0.008842468,-0.045166016,-0.022827148,-0.0004286766,-0.0031738281,0.022964478,-0.0048561096,0.0039520264,-0.0178833,0.010131836,0.0030231476,0.00472641,-0.015159607,0.028045654,0.027160645,0.0079574585,0.022827148,-0.009895325,0.012825012,-0.0016593933,-0.01737976,0.020812988,0.029907227,0.0064315796,-0.018203735,0.030197144,0.0031909943,0.037628174,0.047210693,-0.024368286,-0.0008339882,0.031921387,-0.0022201538,-0.014312744,0.021499634,0.030853271,0.014022827,0.044006348,0.041625977,0.023406982,-0.023910522,0.020004272,-0.0087890625,0.008079529,-0.0121536255,-0.008956909,0.014678955,-0.009689331,0.015068054,-0.0033912659,-0.04156494,0.03475952,0.016647339,-0.0012750626,-0.0008177757,0.002231598,0.030548096,-0.013153076,-0.014564514,0.0033626556,-0.0015172958,0.01776123,0.01828003,0.03164673,-0.016586304,0.03540039,0.008659363,-0.021972656,-0.015914917,0.013343811,-0.0362854,-0.0098724365,-0.0045776367,-0.0209198,-0.06048584,0.0037384033,-0.00041127205,0.003932953,0.012069702,-0.005645752,-0.00349617,0.008888245,0.0181427,0.0132751465,-0.014625549,-0.0067214966,-0.016464233,0.007572174,0.03201294,-0.012557983,0.010665894,-0.009857178,-0.0037460327,0.012573242,-0.0016832352,-0.021438599,-0.0132369995,0.001077652,-0.036499023,0.0035552979,0.030044556,0.007713318,0.060394287,-0.012252808,-0.02619934,-0.006904602,0.0317688,-0.0019264221,-0.011672974,-0.004463196,0.005470276,-0.030670166,0.041381836,0.032989502,0.002532959,0.031799316,-0.013870239,-0.026107788,-0.014701843,0.0009994507,0.022018433,-0.012527466,-0.0021038055,0.002231598,0.03152466,-0.027435303,-0.042938232,-0.0028800964,-0.022155762,-0.036499023,-0.028823853,0.012794495,-0.000726223,0.013015747,0.024215698,0.023391724,-0.0132369995,0.060943604,-0.021728516,0.02973938,-0.018173218,-0.008644104,0.050811768,0.01902771,0.04257202,-0.007144928,-0.010696411,-0.0259552,-0.004878998,0.017120361,0.014892578,0.03366089,-0.0022602081,-0.017547607,0.018203735,-0.006702423,0.014099121,0.0025844574,0.003534317,0.014892578,-0.022628784,-0.0012521744,-0.0060310364,0.005428314,0.010238647,0.03527832,-0.012756348,0.018325806,-0.031707764,-0.013153076,0.03262329,0.018341064,0.006839752,-0.006462097,-0.016830444,0.030136108,-0.013328552,-0.02947998,-0.0049743652,0.024276733,-0.08154297,-0.023040771,0.012466431,0.010551453,-0.021270752,0.050720215,0.009963989,-0.001950264,0.016281128,0.03765869,-0.012458801,0.04748535,0.0014648438,0.05230713,0.046173096,0.013618469,-0.020996094,0.029251099,0.014755249,-0.019073486,0.024261475,0.0463562,0.0011472702,0.016845703,-0.013389587,-0.0042304993,0.004119873,0.007144928,-0.029434204,-0.0019454956,-0.014404297,-0.003419876,0.012565613,0.020568848,-0.012435913,-0.011222839,-0.009742737,-0.012512207,0.009239197,0.047668457,0.022827148,-0.034240723,0.015129089,-0.001039505,-0.00005465746,-0.0095825195,-0.007843018,0.0012083054,-0.046081543,-0.0024738312,0.02607727,-0.0032100677,0.021652222,-0.030639648,-0.000118911266,0.03152466,0.014045715,0.048980713,0.02168274,-0.011482239,0.019821167,-0.010391235,0.0018253326,-0.014816284,-0.0014276505,0.010604858,0.0042419434,0.013542175,-0.021057129,0.011703491,-0.01473999,-0.0042533875,0.010040283,0.012748718,0.009895325,-0.011062622,-0.0006341934,0.016662598,0.02923584,-0.014755249,-0.025878906,-0.007785797,0.008148193,0.068847656,-0.008888245,0.004688263,0.0107040405,0.037109375,0.018234253,0.048706055,0.018096924,0.029891968,0.0158844,-0.0025043488,-0.0065994263,0.033355713,-0.012741089,-0.034973145,0.024627686,-0.024978638,-0.024719238,0.028121948,0.019683838,0.0206604,-0.04147339,-0.011238098,-0.017974854,-0.04159546,-0.0058670044,-0.011802673,0.0065612793,-0.009399414,-0.019592285,0.022888184,-0.009941101,-0.0070724487,-0.012893677,-0.000027179718,-0.01637268,-0.057891846,-0.0038280487,-0.018920898,-0.004211426,-0.03012085,0.016174316,0.007385254,0.026351929,-0.013000488,-0.004310608,-0.0031394958,0.016021729,0.0138549805,0.02053833,0.020431519,-0.014717102,-0.032440186,-0.02670288,-0.0021400452,-0.010345459,0.03463745,-0.030258179,0.00881958,0.018035889,-0.012390137,-0.0010595322,-0.008262634,-0.022567749,-0.014541626,-0.026901245,-0.012634277,0.011634827,0.02720642,0.009094238,-0.0041885376,0.032104492,-0.016159058,-0.030899048,0.010131836,0.044311523,0.013038635,0.026428223,-0.00983429,0.00749588,-0.052459717,-0.001159668,-0.016098022,-0.0075416565,0.022705078,-0.0011940002,0.0013990402,0.013931274,0.01486969,-0.004688263,0.010246277,0.04562378,0.020980835,0.0023117065,0.024963379,-0.017074585,0.0025787354,-0.039642334,-0.011299133,0.019836426,0.04421997,0.014579773,0.009666443,-0.028778076,-0.0079193115,-0.009841919,0.009712219,0.013404846,-0.006088257,-0.040802002,-0.016540527,-0.011009216,0.021362305,-0.00023150444,-0.004962921,0.00087070465,-0.0038337708,-0.02519226,-0.020355225,-0.040405273,0.045013428,0.007408142,-0.024993896,-0.0039520264,0.0077667236,0.018508911,-0.023864746,-0.005344391,-0.06555176,-0.019744873,-0.02168274,-0.012611389,0.0023708344,-0.013923645,0.019317627,-0.0087890625,-0.006046295,-0.011405945,0.0124435425,0.011764526,-0.025283813,-0.010826111,0.025543213,0.02835083,-0.014411926,0.017669678,0.0013618469,0.000975132,-0.0036849976,0.0023078918,0.008300781,-0.03012085,0.023773193,0.01586914,-0.0073013306,0.030319214,-0.020004272,0.03668213,-0.008560181,0.0057258606,-0.020965576,-0.015670776,0.03265381,-0.020263672,-0.0158844,-0.007583618,-0.0025901794,-0.0317688,0.01158905,0.01159668,0.008522034,-0.015335083,0.04559326,0.0003247261,-0.019989014,0.02230835,0.017837524,-0.021850586,0.008003235,0.024932861,-0.01398468,0.0070610046,-0.009155273,-0.010322571,-0.015205383,-0.031402588,-0.010353088,-0.0184021,0.008125305,0.01876831,0.013618469,0.042419434,0.00333786,0.011367798,0.03363037,0.010475159,0.026275635,0.0073280334,0.038482666,0.01826477,-0.022354126,0.014564514,0.008293152,-0.015853882,0.0058937073,-0.0024662018,0.018295288,-0.0209198,0.004562378,0.010169983,0.020812988,0.023544312,0.01727295,-0.005771637,-0.0012569427,-0.047332764,-0.008125305,-0.023910522,-0.008262634,0.03515625,0.017364502,0.019851685,0.0038089752,-0.02178955,0.023773193,0.029388428,-0.0029792786,-0.026504517,-0.008811951,0.008857727,-0.0029525757,0.016021729,0.018249512,-0.01096344,-0.019363403,-0.013710022,-0.0046157837,0.0095825195,-0.016403198,0.016494751,0.00920105,-0.013771057,-0.026428223,0.028015137,-0.010757446,-0.009407043,0.014503479,0.0014305115,0.020339966,0.018676758,-0.021728516,0.011528015,0.028213501,-0.03427124,0.04800415,0.013153076,0.0038375854,-0.006187439,-0.009513855,-0.03616333,-0.0042877197,0.0014324188,-0.012771606],"createdAt":"2026-04-18T18:53:01.404Z","updatedAt":"2026-04-27T21:34:10.081Z","lastSeenAt":"2026-04-27T21:34:10.081Z","tsv":"'/api/v1/portfolios/54/transactions':47 '0.02':55,122,211 '0x8335':193 '1':189 '20000':207 '2913':194 '300':219 '54':133 '6':215 'Base network API' 'USDC pay-per-call API' 'accept':48,241 'access':34 'account':77 'advertis':84 'ai/ml':96 'amount':205 'analyt':95 'api':74,92 'appear':137 'avail':228 'base':8,22,62,196,208 'beyond':146 'bodi':165,238 'broader':81 'call':12,26,57 'challeng':72,187 'charg':52 'classif':100 'connect':159 'contract':192 'convers':116 'crypto portfolio data' 'data':38,94,175 'decim':216 'detail':225 'determin':240 'document':145,226 'embed':101 'empti':152 'endpoint':6,20,30,128,179 'essenti':151 'estim':110 'exact':163,201 'exchang':105 'experi':234 'feed':104 'financ':142 'finance-rel':141 'finance/web3':102 'format':168 'gas':109 'gate':3,17 'generat':117 'geocod':114 'given':212 'handl':66 'header':71 'howev':125 'i.e':210 'infer':97 'infrastructur':112 'inlin':67 'integr':230 'key':75 'land':148 'list':129 'live':181 'lowpaymentfee API' 'lowpaymentfee.com':32,82 'max':204 'natur':171 'need':232 'network':63 'no-api-key' 'openapi':222 'page':149,156 'paramet':242 'pay':10,24,89 'pay-per-cal':9,23 'pay-per-request':88 'payment':42,64,198 'per':11,25,56,90,123 'platform':83 'portfolio':4,18,36,132,174 'portfolio transactions API' 'portfolio-transactions' 'post':49,237 'post-endpoint' 'price':103 'protocol':43 'provid':33 'quot':108 'rang':86 'rate':106 'relat':143 'request':50,91,124,164 'requir':79 'resourc':46,144 'respons':167 'return':183 'schema':166 'scheme':199 'second':220 'sentiment':98 'show':158 'span':93 'spec':223 'specif':45,127 'sub':155 'sub-pag':154 'summar':99 'target':131 'timeout':217 'token':107 'transact':5,19,37,135 'transaction history API' 'uniform':121 'unit':209 'unknown':177 'usdc':14,28,59,191,213 'usdc-base' 'util':113 'valid':115,185 'version':188 'via':39,68 'wallet':160 'x402':2,16,41,70,186 'x402 finance endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fb320229-129f-4cf2-9b01-6d0b19031064","listingId":"a0a94c81-8701-4b49-a5fa-0aa311e0b301","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/54/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:01.404Z"}],"sources":[{"listingId":"a0a94c81-8701-4b49-a5fa-0aa311e0b301","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/54/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:01.404Z","lastSeenAt":"2026-04-27T21:34:10.081Z"}],"details":{"listingId":"a0a94c81-8701-4b49-a5fa-0aa311e0b301","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/54/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/54/transactions"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/54/transactions"}],"useCases":["Fetching transaction records for a specific portfolio via micropayment","Integrating pay-per-call financial data into an AI agent workflow","Accessing portfolio transaction data without API key registration"],"bestFor":["Agents needing on-demand portfolio transaction data with no signup","Developers experimenting with x402 payment protocol integrations","Micropayment-gated financial data access on Base"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Bulk historical transaction data retrieval (pay-per-call at $0.02 adds up)","Non-crypto-native users unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.484Z"},"updatedAt":"2026-04-27T21:34:10.081Z"}}