{"id":"ab8382d0-6c18-42ef-b3ca-ebf471220f5a","shortId":"vrc94V","kind":"x402","title":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","tagline":"Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data at `/api/v1/portfolios/64/transactions`. It accepts POST requests and is paid per-call using USDC on the Base network. The x402 challenge confirms the endpoint is live, advertising a max cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required — payment is handled entirely through the x402 protocol's X-PAYMENT header.\n\nThe broader lowpaymentfee.com platform hosts a variety of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and utility/infrastructure services. All endpoints on the platform are uniformly priced at $0.02 per request and settle on the Base network in USDC. However, this specific listing covers only the `/api/v1/portfolios/64/transactions` endpoint.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint's purpose — retrieving or creating transactions for portfolio ID 64 — can only be inferred from the URL path. Prospective callers should expect to experiment or contact the provider for details on the expected POST body and response format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-transactions","pay-per-call","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["portfolio transactions API","x402 paid API","USDC micropayment API","Base network API","pay-per-request endpoint","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or JSON schema for request or response bodies","The endpoint path references a hardcoded portfolio ID (64); unclear if this is a demo or production resource","No information on what POST body fields are expected or what the response contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/64/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/64/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint is only inferable from the URL path. 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":"2026-04-19T08:51:03.050Z","embedding":[-0.016418457,-0.020141602,0.03338623,-0.0003170967,0.006164551,-0.024810791,-0.027114868,0.0158844,0.076660156,-0.058410645,0.017852783,-0.041625977,-0.018051147,-0.037597656,-0.0052986145,0.0016107559,0.01537323,0.0043182373,-0.052001953,0.03479004,0.03955078,-0.03866577,-0.02407837,0.0048332214,-0.01701355,-0.014320374,-0.025650024,-0.009384155,-0.04257202,-0.04071045,0.05343628,-0.027053833,-0.010269165,0.009117126,-0.034118652,0.008140564,-0.005947113,0.032562256,0.040527344,-0.013435364,0.02670288,-0.04812622,0.014663696,-0.018188477,-0.026992798,0.006580353,0.01499939,-0.040618896,0.050994873,0.008682251,-0.04196167,-0.018203735,0.013496399,0.019119263,0.01158905,0.009010315,0.027999878,-0.019470215,-0.0020389557,0.026992798,-0.0053367615,-0.058441162,0.0017108917,-0.014846802,0.0020427704,0.059509277,-0.02909851,0.057250977,-0.009864807,0.08178711,0.017807007,0.032714844,0.014770508,0.028747559,-0.0055885315,-0.014022827,-0.012191772,0.064331055,-0.011245728,-0.051849365,0.004146576,-0.0049972534,-0.060394287,-0.00504303,-0.023712158,-0.040252686,-0.0069618225,0.013214111,-0.04458618,0.027679443,-0.077941895,0.0028209686,0.012313843,0.017349243,-0.009140015,-0.019821167,-0.0019874573,0.02482605,-0.007980347,0.026046753,0.011199951,-0.028945923,0.011871338,0.00043988228,0.042144775,0.038726807,0.013771057,0.035858154,-0.004524231,-0.0067863464,-0.062561035,0.0067749023,0.000875473,0.006465912,-0.0039253235,-0.0178833,-0.020812988,0.02281189,-0.02619934,0.017166138,-0.05178833,0.028366089,0.008628845,0.013710022,0.00894928,-0.050231934,-0.0146102905,0.009498596,-0.030029297,-0.020462036,0.009971619,0.015365601,0.00944519,-0.014823914,-0.01687622,0.00818634,-0.036590576,-0.013664246,-0.055541992,-0.03265381,0.031311035,-0.04675293,0.019729614,0.026443481,-0.09527588,0.016784668,-0.015731812,0.03845215,-0.010719299,-0.007648468,0.017974854,0.007896423,-0.010131836,-0.003616333,-0.012702942,-0.04827881,-0.009513855,0.031982422,-0.0058898926,0.032562256,-0.012718201,0.03866577,0.01940918,0.008834839,0.015022278,0.019363403,0.003818512,-0.05670166,-0.071899414,-0.013710022,0.029647827,-0.043670654,-0.01739502,0.0044174194,-0.014320374,-0.08538818,-0.01210022,-0.018737793,-0.006942749,-0.03729248,-0.012374878,-0.030700684,0.020141602,-0.015075684,-0.07305908,-0.008972168,-0.018585205,0.047821045,0.013839722,0.026748657,0.03967285,0.0115737915,0.042022705,0.048950195,-0.010620117,-0.010238647,0.0035552979,-0.00012493134,0.005683899,-0.010467529,0.013214111,-0.032104492,0.026519775,0.0703125,-0.006259918,-0.026168823,0.010635376,-0.06021118,-0.031555176,-0.024841309,0.036010742,-0.0016231537,-0.0135269165,0.02545166,-0.0039749146,-0.028579712,0.015296936,0.037139893,0.0069007874,0.05529785,0.016281128,0.014526367,0.033294678,-0.0046195984,-0.02796936,0.050720215,0.034576416,-0.0009484291,-0.0076141357,-0.062438965,0.03451538,0.027572632,-0.027420044,0.0005350113,0.0016946793,0.014770508,-0.03616333,-0.005592346,0.017150879,-0.0143966675,-0.0012083054,-0.024154663,-0.016418457,0.018707275,-0.00032424927,0.0023918152,-0.032409668,-0.0881958,0.052856445,0.031982422,0.048797607,-0.0066604614,-0.009674072,-0.008529663,-0.0054016113,-0.059387207,0.03387451,0.047576904,-0.015586853,-0.017501831,0.032989502,-0.015365601,-0.027374268,-0.0062942505,-0.028945923,-0.026626587,-0.023498535,0.000039756298,-0.06402588,0.018539429,0.021484375,0.022644043,0.026550293,-0.006340027,-0.0592041,-0.012069702,-0.024414062,0.006893158,-0.036193848,-0.017578125,0.009223938,0.024719238,-0.0096588135,0.009529114,0.013671875,0.0003106594,0.020462036,0.010665894,0.015640259,-0.0016183853,-0.023025513,0.025527954,0.0071105957,-0.05178833,0.0028934479,0.0017557144,0.049713135,-0.043518066,0.028198242,-0.023544312,0.013175964,0.035247803,-0.016418457,-0.0637207,0.015701294,0.012519836,0.0060691833,0.03778076,-0.011703491,-0.024719238,-0.03112793,0.075683594,-0.019927979,-0.022094727,0.023483276,0.022125244,0.02960205,-0.027252197,-0.05227661,-0.031402588,-0.0039863586,-0.032073975,0.02166748,-0.0025615692,0.021347046,-0.003255844,0.0064849854,-0.029891968,0.0006303787,-0.021270752,0.005657196,-0.029205322,0.005432129,-0.017822266,-0.024871826,0.026901245,-0.006668091,0.010482788,0.016921997,0.0418396,0.008857727,0.00041937828,-0.028244019,-0.026672363,0.0057640076,-0.016159058,0.027740479,0.04360962,0.0152282715,0.02961731,-0.015609741,-0.01386261,0.035247803,0.026824951,0.035003662,0.00566864,-0.011787415,-0.06994629,-0.066833496,-0.03164673,-0.023239136,0.021697998,0.032989502,-0.008422852,0.04156494,0.021530151,-0.0038871765,-0.05038452,0.03164673,-0.041503906,0.018157959,0.041503906,-0.00434494,-0.022567749,-0.005252838,-0.0048942566,-0.0058784485,0.039276123,0.01889038,0.03186035,0.047302246,0.032836914,0.01676941,0.0045280457,-0.0071258545,0.024520874,0.006904602,-0.01020813,-0.041168213,-0.0178833,0.007385254,-0.008323669,-0.025375366,-0.06210327,0.041168213,0.032165527,0.091308594,0.03262329,0.020385742,0.008239746,-0.030426025,0.0028476715,-0.033050537,-0.010246277,-0.035339355,-0.04837036,0.037384033,-0.0032405853,0.01309967,-0.021133423,0.041046143,-0.008865356,0.01751709,-0.025726318,0.04547119,-0.008804321,-0.016738892,0.017532349,0.021896362,0.039154053,0.073913574,-0.012763977,0.03173828,0.029296875,-0.03579712,0.011352539,0.038970947,-0.026626587,-0.021392822,-0.038146973,-0.030853271,0.0022602081,-0.010520935,-0.01940918,0.00028848648,0.0060768127,0.030471802,0.018569946,-0.018325806,-0.014823914,0.0034370422,0.009140015,-0.041229248,0.0038719177,-0.03387451,0.009460449,0.04815674,-0.014572144,-0.002565384,-0.012794495,-0.023361206,0.016708374,0.017181396,0.019241333,-0.0029354095,-0.023498535,0.039642334,-0.008262634,0.009407043,0.0016946793,0.02897644,0.026138306,0.015113831,0.04852295,0.020767212,-0.013298035,-0.0770874,-0.0038146973,-0.064575195,-0.00016117096,0.05215454,-0.035491943,-0.008781433,-0.011604309,-0.038513184,0.00091314316,0.00504303,-0.024887085,-0.015731812,0.0003130436,-0.00894165,-0.033355713,-0.06451416,-0.01083374,0.017807007,0.07476807,0.023025513,0.0020389557,-0.041412354,0.0019664764,0.03086853,-0.0013608932,0.036743164,-0.013221741,-0.013961792,-0.01448822,-0.034332275,-0.012420654,-0.011558533,0.025405884,0.004196167,-0.008575439,0.025650024,0.011787415,0.016830444,0.009048462,-0.013374329,0.010482788,-0.014762878,0.014160156,0.0071105957,0.06573486,0.0029678345,-0.042297363,-0.049316406,0.019104004,-0.001411438,0.038330078,-0.0362854,-0.02746582,0.0010147095,0.00078725815,-0.018737793,-0.030197144,0.005191803,-0.0060424805,-0.053131104,-0.059295654,0.040008545,-0.0206604,0.008804321,0.027770996,-0.00083971024,0.0082473755,-0.012687683,0.0146102905,-0.00025868416,-0.02670288,-0.033355713,-0.03665161,-0.039245605,-0.029373169,-0.024353027,-0.032928467,0.025177002,-0.029418945,0.030731201,-0.013320923,-0.036895752,0.026428223,0.016082764,0.0112838745,0.017288208,-0.0023822784,0.018173218,0.02859497,0.010604858,-0.04043579,0.03503418,0.006855011,0.005756378,0.000062942505,0.048065186,0.012382507,-0.003627777,0.020309448,-0.015197754,-0.024612427,-0.03488159,-0.010574341,0.00022125244,0.002450943,-0.015083313,-0.043304443,0.034454346,0.00969696,-0.035247803,-0.060913086,0.01612854,0.016448975,-0.036590576,0.021743774,0.010917664,0.03479004,-0.02670288,0.02947998,0.008728027,0.04547119,0.042541504,0.0042266846,0.0000022053719,0.016494751,-0.014434814,0.008270264,-0.0020618439,0.0036716461,0.0068855286,0.009864807,0.037078857,-0.0022621155,0.007041931,-0.021560669,-0.039916992,0.0107803345,-0.014007568,-0.021972656,0.019088745,0.011474609,0.047851562,-0.0035552979,0.022201538,0.018112183,-0.0010461807,-0.012283325,0.00061941147,0.025161743,-0.0019483566,0.0037631989,0.008453369,0.011924744,0.026123047,-0.06732178,-0.0095825195,0.01876831,0.007762909,-0.001578331,-0.04916382,-0.05029297,0.0031795502,0.0413208,0.009391785,0.014175415,0.021118164,0.0026435852,-0.0124053955,-0.0047912598,0.0016183853,0.0021953583,-0.022903442,-0.051849365,-0.012870789,0.011474609,0.000248909,-0.021011353,0.017181396,-0.018814087,-0.018966675,0.008636475,-0.03842163,-0.0023059845,-0.0131073,0.0056037903,0.032958984,0.006362915,0.021469116,-0.012138367,-0.05529785,0.00044441223,-0.004333496,0.056793213,-0.054840088,0.027877808,-0.012039185,-0.012565613,0.004638672,0.010398865,0.019683838,0.03527832,0.0079574585,0.041534424,-0.04248047,0.05810547,-0.018234253,0.011390686,-0.002521515,-0.04498291,-0.009841919,-0.011680603,-0.014076233,0.052642822,-0.033050537,-0.020904541,-0.04550171,-0.032104492,-0.012306213,-0.057159424,0.0158844,0.026428223,0.047546387,-0.0335083,0.0073928833,-0.01083374,0.0072631836,-0.011054993,-0.026428223,-0.014297485,0.005622864,0.0146102905,0.0143585205,-0.021957397,-0.011856079,-0.022415161,0.0020694733,-0.047027588,-0.050476074,0.014915466,-0.0013599396,-0.020462036,-0.0011281967,-0.02168274,-0.011474609,-0.00013566017,-0.039794922,-0.0034065247,-0.007194519,0.027648926,-0.010871887,-0.022979736,-0.015525818,0.016448975,-0.0046958923,0.028503418,0.0076828003,-0.012962341,-0.0501709,0.018920898,-0.0051231384,0.031051636,-0.010749817,-0.01701355,0.005405426,-0.014785767,-0.05178833,-0.006542206,0.013587952,-0.025421143,0.0019664764,-0.011634827,-0.032470703,0.012283325,-0.029693604,-0.012390137,0.016281128,-0.0061187744,0.011039734,-0.009597778,0.0178833,0.023498535,-0.017547607,-0.01550293,0.01474762,0.009010315,0.013023376,0.028198242,0.046173096,-0.012374878,-0.03552246,0.0032844543,-0.007247925,0.0007133484,-0.035247803,0.026763916,-0.01361084,-0.003293991,-0.012046814,0.0206604,-0.021209717,0.013244629,0.06921387,0.009590149,-0.010574341,-0.007156372,-0.01687622,0.017333984,0.03591919,-0.012367249,0.017807007,-0.043151855,0.016830444,-0.019332886,0.03878784,0.0124435425,0.032714844,-0.014572144,-0.029205322,-0.007648468,-0.017349243,-0.0052337646,-0.052947998,-0.01058197,-0.07165527,0.00522995,-0.014923096,-0.037506104,0.0135269165,0.02482605,-0.010620117,-0.08026123,-0.007106781,0.04168701,0.004573822,0.031082153,-0.0031147003,0.03933716,0.023223877,-0.021987915,-0.003211975,0.011604309,-0.041046143,0.007663727,-0.022140503,0.007587433,-0.024459839,-0.014007568,0.0027923584,-0.009010315,0.023986816,0.0013561249,0.022567749,-0.022445679,0.019226074,-0.019165039,0.010643005,-0.014625549,-0.023391724,0.04937744,-0.03616333,0.034698486,0.03137207,0.018463135,0.0068473816,0.024856567,0.03945923,-0.036315918,0.004146576,0.021331787,0.018997192,0.020401001,-0.006587982,0.033416748,0.017990112,0.012435913,-0.011787415,-0.008476257,0.010986328,-0.025039673,-0.0040626526,0.029891968,-0.023788452,-0.0127334595,-0.029830933,0.0070114136,0.003921509,0.0103302,0.0030059814,-0.015098572,-0.013763428,-0.022872925,0.0027980804,0.0059165955,0.008888245,-0.014846802,0.026519775,0.003168106,0.023086548,0.0017080307,-0.0044441223,0.01309967,0.040771484,0.0046691895,-0.008224487,0.016815186,-0.0006108284,0.025894165,-0.00021231174,0.011421204,-0.054656982,-0.0121536255,-0.018051147,-0.00009572506,-0.009292603,-0.017440796,-0.00504303,-0.019927979,-0.006187439,-0.013084412,-0.029525757,-0.018112183,-0.017593384,-0.023956299,-0.026916504,-0.006832123,0.012908936,0.015586853,0.018295288,-0.0003118515,-0.020050049,0.023086548,-0.0012483597,-0.013336182,0.032043457,0.03201294,-0.0027618408,-0.03668213,0.0034122467,-0.033813477,-0.020233154,0.008956909,-0.027526855,0.012245178,0.02734375,0.001156807,-0.009414673,0.025558472,0.032714844,-0.024917603,0.011779785,-0.0009446144,0.023147583,-0.021331787,0.019515991,-0.04562378,0.03378296,0.012687683,0.012207031,0.0051994324,-0.024261475,-0.025421143,0.030395508,0.015312195,-0.011505127,0.036071777,0.01852417,0.039611816,-0.014122009,0.0058059692,-0.0043144226,-0.025299072,-0.017456055,0.015701294,0.01008606,0.0029087067,0.007850647,-0.029067993,0.003622055,-0.036743164,0.021759033,0.00030255318,0.014450073,-0.0463562,-0.03515625,-0.012306213,-0.020385742,-0.038330078,-0.00048828125,-0.009460449,0.04525757,0.018218994,0.035339355,0.029571533,0.012901306,-0.0049743652,-0.03564453,-0.024383545,0.0048065186,0.014122009,0.01184082,-0.014572144,0.029693604,0.062164307,-0.010154724,0.04196167,0.03668213,0.023406982,0.010574341,0.002243042,-0.030426025,0.029266357,0.00092983246,0.0064048767,0.0078048706,0.032409668,-0.023483276,0.029769897,0.013671875,0.028518677,-0.038330078,0.027648926,0.08294678,0.015060425,-0.01512146,0.043548584,-0.004634857,-0.020721436,-0.010917664,-0.023483276,0.046691895,-0.01512146,0.026000977,0.044311523,0.010101318,-0.0008625984,-0.0056495667,-0.013801575,-0.016418457,0.051635742,0.027496338,-0.0012722015,-0.0031147003,-0.025726318,0.010040283,-0.041870117,-0.032806396,0.0029087067,-0.011100769,0.020614624,-0.00009447336,-0.0011949539,-0.022842407,0.0067443848,0.007041931,0.0051193237,-0.011505127,0.036102295,0.036315918,0.0063209534,0.017562866,-0.014701843,0.020355225,-0.011817932,-0.017425537,0.02835083,0.027740479,0.0049095154,-0.024536133,0.02130127,-0.004108429,0.04006958,0.057037354,-0.0151901245,0.003534317,0.034423828,-0.003540039,-0.009719849,0.035339355,0.029800415,0.0090789795,0.045898438,0.039794922,0.032592773,-0.034729004,0.027496338,0.0026550293,0.0031490326,-0.02218628,-0.006954193,0.017120361,-0.016281128,0.024414062,0.0032253265,-0.042236328,0.023239136,0.020065308,0.0027446747,-0.009216309,-0.0037193298,0.023422241,-0.030578613,-0.01550293,0.0041236877,-0.003862381,0.019744873,0.023208618,0.029449463,-0.014221191,0.027023315,0.004940033,-0.011817932,-0.020446777,0.025924683,-0.030029297,-0.0050315857,-0.0046577454,-0.008590698,-0.064208984,0.011367798,-0.004863739,0.018173218,0.017044067,-0.0019512177,-0.0073013306,0.004322052,0.02178955,0.0065994263,-0.0053710938,-0.007507324,-0.012664795,0.021759033,0.030944824,-0.0061302185,0.016204834,-0.0023670197,-0.011558533,-0.0006337166,0.0014562607,-0.021408081,-0.018447876,-0.010986328,-0.016952515,0.011665344,0.022354126,0.011291504,0.067871094,-0.020980835,-0.024353027,0.0045928955,0.02420044,-0.001083374,-0.006084442,0.006729126,0.0072364807,-0.026443481,0.04071045,0.038970947,0.017074585,0.030303955,-0.0061950684,-0.018447876,-0.011070251,0.0055274963,0.026763916,-0.009361267,-0.0027370453,0.0025043488,0.03527832,-0.024887085,-0.032714844,0.0017337799,-0.021606445,-0.03152466,-0.02142334,0.0023212433,-0.0024642944,0.020858765,0.024642944,0.020523071,-0.021133423,0.05709839,-0.019821167,0.029968262,-0.01386261,-0.012382507,0.046142578,0.01777649,0.033721924,-0.011390686,-0.009773254,-0.041625977,0.004512787,0.023788452,0.013999939,0.023361206,-0.004436493,-0.011489868,0.019821167,-0.004299164,0.030700684,0.0024642944,0.0030326843,0.01864624,-0.020751953,-0.010803223,-0.0158844,0.005558014,0.008705139,0.03186035,-0.019058228,0.015014648,-0.029678345,-0.010574341,0.02659607,0.0047187805,0.004886627,-0.0035095215,-0.020050049,0.027450562,-0.01586914,-0.028717041,-0.0041885376,0.02003479,-0.07525635,-0.020584106,0.00945282,0.008529663,-0.009498596,0.04812622,0.013549805,0.00032043457,0.006450653,0.032714844,-0.019866943,0.03552246,-0.0062675476,0.048034668,0.035858154,0.00655365,-0.022064209,0.015388489,0.020462036,-0.018707275,0.024551392,0.051239014,-0.016052246,0.013664246,-0.015487671,0.0020503998,0.0058937073,-0.005821228,-0.012031555,0.005317688,-0.0090789795,-0.0049743652,-0.0003426075,0.01828003,-0.011230469,-0.007160187,-0.010360718,-0.011772156,0.012550354,0.043945312,0.020904541,-0.033447266,0.0063972473,0.00021731853,0.0010185242,-0.008895874,-0.0055351257,-0.0064735413,-0.036895752,0.0068855286,0.023620605,0.0050086975,0.031677246,-0.033233643,-0.0015335083,0.022766113,0.01626587,0.048187256,0.0128479,-0.0107421875,0.020324707,-0.011703491,-0.013244629,-0.014038086,-0.0028686523,0.014389038,0.011520386,0.013809204,-0.021148682,0.016616821,-0.02482605,0.010803223,0.018676758,0.0009860992,0.010879517,-0.0090789795,-0.010261536,0.021759033,0.024475098,-0.0054359436,-0.023925781,-0.006591797,0.014221191,0.0736084,-0.003955841,0.011749268,0.025039673,0.029769897,0.01335144,0.04736328,0.017349243,0.03062439,0.03201294,-0.011497498,-0.0020217896,0.033111572,-0.0046920776,-0.029205322,0.02357483,-0.023239136,-0.01259613,0.023147583,0.02545166,0.020584106,-0.035217285,-0.0025691986,-0.026123047,-0.030151367,-0.0031738281,-0.0067749023,0.0065612793,-0.010017395,-0.012420654,0.0065612793,-0.015823364,-0.02609253,-0.01864624,-0.005630493,-0.008232117,-0.05593872,-0.003774643,-0.032348633,0.0036315918,-0.03164673,0.005836487,0.0019569397,0.018539429,-0.017425537,-0.008903503,-0.0118255615,0.0132751465,0.031082153,0.020568848,0.016113281,-0.021224976,-0.020248413,-0.035217285,-0.00030326843,-0.008110046,0.04135132,-0.020706177,0.005645752,0.03439331,-0.012580872,-0.0032310486,-0.0006995201,-0.007762909,-0.021606445,-0.011650085,-0.0090789795,0.020874023,0.017089844,-0.005004883,-0.012176514,0.028701782,-0.030899048,-0.021011353,0.022323608,0.039093018,0.01637268,0.024002075,-0.017608643,0.011039734,-0.032714844,-0.005382538,-0.012237549,0.0048675537,0.0073051453,0.0059280396,-0.00081062317,0.010147095,0.018508911,-0.00097322464,0.0071792603,0.046295166,0.01878357,0.008590698,0.027877808,-0.01071167,0.008888245,-0.033050537,-0.0029640198,0.012832642,0.03112793,0.020629883,0.0074386597,-0.021530151,-0.004234314,-0.018371582,0.015640259,0.0077438354,-0.013244629,-0.05117798,-0.011528015,-0.017471313,0.020629883,-0.007472992,0.0036678314,-0.011543274,0.016220093,-0.012329102,-0.037231445,-0.039215088,0.04425049,0.006843567,-0.023162842,-0.007118225,0.01499939,0.02607727,-0.02281189,-0.001247406,-0.05508423,-0.029846191,-0.0064048767,-0.00969696,0.013175964,-0.0019664764,0.0059432983,-0.011436462,-0.0031204224,-0.010116577,0.013511658,0.011260986,-0.02192688,-0.010360718,0.0181427,0.02357483,-0.001408577,0.0234375,0.0038375854,0.010826111,-0.0027599335,-0.007118225,0.0026226044,-0.03677368,0.029418945,0.010177612,-0.0037498474,0.03414917,-0.01838684,0.021514893,-0.026367188,0.020935059,-0.011024475,-0.01133728,0.041381836,-0.035888672,-0.012870789,-0.0025577545,-0.004173279,-0.02772522,0.011703491,0.010932922,0.01889038,-0.0143966675,0.05065918,-0.004573822,-0.013061523,0.017486572,0.021484375,-0.00831604,0.0028133392,0.026397705,-0.009880066,0.007293701,-0.0087509155,-0.021957397,-0.023040771,-0.029296875,0.0030288696,-0.0069732666,0.0038471222,0.02558899,0.012763977,0.047302246,-0.0008177757,0.017562866,0.016555786,0.014045715,0.025283813,0.008148193,0.032348633,0.0026340485,-0.019760132,0.010986328,-0.0016908646,-0.017669678,0.006290436,-0.004070282,0.015159607,-0.024475098,0.0029144287,0.00043582916,0.025848389,0.008903503,0.017349243,-0.009376526,-0.0035190582,-0.038482666,-0.02041626,-0.014915466,-0.0041923523,0.029800415,0.006462097,0.032440186,0.002445221,-0.019592285,0.018157959,0.032043457,-0.0024280548,-0.00642395,-0.009597778,0.022857666,-0.00076532364,0.02494812,0.009841919,-0.008972168,-0.026000977,-0.007865906,-0.019302368,0.013336182,-0.012962341,0.014411926,0.0061149597,-0.014007568,-0.027572632,0.02897644,-0.012504578,-0.013710022,0.012199402,0.006214142,0.03414917,0.014564514,-0.022109985,0.012451172,0.02178955,-0.04550171,0.05670166,0.018157959,0.018447876,0.000995636,-0.007331848,-0.032806396,-0.017944336,-0.012107849,-0.012924194],"createdAt":"2026-04-18T18:53:14.615Z","updatedAt":"2026-04-27T20:08:58.661Z","lastSeenAt":"2026-04-27T20:08:58.661Z","tsv":"'/api/v1/portfolios/64/transactions':43,165 '/request':14,28 '0.02':13,27,83,147 '000':74 '20':73 '6':79 '64':221 'Base network API' 'USDC micropayment API' 'accept':45,207 'access':37 'advertis':68 'ai/ml':123 'analysi':126 'analyt':122 'api':87,119,174 'base':9,23,58,75,154 'base-network' 'bodi':246 'broader':108 'call':4,18,53,118 'caller':231 'challeng':62 'classif':128 'confirm':63 'connect':183 'contact':237 'content':189 'cost':71 'cover':162 'crawl':172 'creat':216 'crypto':132 'crypto payment API' 'data':41,121,134 'decim':80 'descript':200 'detail':241 'doc':173 'document':167 'embed':129 'enabl':32 'endpoint':7,21,33,65,139,166,206,211 'entir':97 'equal':82 'exampl':197 'expect':233,244 'experi':235 'extrem':169 'field':203 'financ':130 'format':249 'handl':96 'header':106 'host':111 'howev':158 'id':220 'infer':124,225 'key':88 'limit':91 'list':161 'live':67 'lowpaymentfee' 'lowpaymentfee.com':35,109 'market':133 'max':70 'network':59,155 'no-api-key' 'openapi':193 'page':178 'paid':50 'path':229 'pay':2,16,116 'pay-per-cal':1,15,115 'pay-per-call' 'pay-per-request endpoint' 'payment':94,105 'per':3,17,52,84,117,148 'per-cal':51 'platform':110,142 'portfolio':5,19,39,219 'portfolio transactions API' 'portfolio-transactions' 'post':46,245 'post-endpoint' 'price':145,175 'prompt':185 'prospect':230 'protocol':101 'provid':36,239 'purpos':213 'rate':90 'readm':177 'request':47,85,149 'request/response':196 'requir':93 'respons':248 'retriev':214 'return':180,209 'schema':194 'sentiment':125 'servic':137 'settl':151 'span':120 'spars':170 'specif':160 'summar':127 'transact':6,20,40,205,217 'uniform':144 'unit':76 'url':228 'usdc':12,26,55,78,157 'usdc-settlement' 'use':54 'utility/infrastructure':136 'varieti':113 'via':10,24 'wallet':184 'x':104 'x-payment':103 'x402':11,25,31,61,100 'x402 paid API' 'x402-enabled':30 'x402-payment'","prices":[{"id":"ec0765ef-b158-4afa-9a2a-feb4a0b3a5f3","listingId":"ab8382d0-6c18-42ef-b3ca-ebf471220f5a","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/64/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":"2026-04-18T18:53:14.615Z"}],"sources":[{"listingId":"ab8382d0-6c18-42ef-b3ca-ebf471220f5a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/64/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:14.615Z","lastSeenAt":"2026-04-27T20:08:58.661Z"}],"details":{"listingId":"ab8382d0-6c18-42ef-b3ca-ebf471220f5a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/64/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":"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/64/transactions"},{"claim":"All endpoints on the platform are 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":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/64/transactions"}],"useCases":["Fetching or creating transaction records for a specific portfolio","Integrating portfolio transaction data into automated trading or analytics pipelines","Agent-driven portfolio management workflows that pay per API call with USDC"],"bestFor":["Developers wanting keyless, pay-per-call access to portfolio transaction data","AI agents that can settle x402 payments on Base in USDC","Users who prefer no subscription commitments and micro-transaction pricing"],"notFor":["Users needing detailed API documentation or schema before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.884Z"},"updatedAt":"2026-04-27T20:08:58.661Z"}}