{"id":"a07eb002-b0e5-470a-93bd-37fab98e4194","shortId":"kGMxxj","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are payable per-request via the x402 protocol on the Base network using USDC (USD Coin). The specific endpoint at `/api/v1/item/43` is listed as \"Premium API Access\" and accepts POST requests, returning application/json responses.\n\nThe platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, no minimums, and instant access. However, the x402 challenge for this particular endpoint (`/api/v1/item/43`) specifies a `maxAmountRequired` of 20000 (in USDC's 6-decimal representation, this equals $0.02), consistent with the advertised pricing. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The specific functionality behind `/api/v1/item/43` (\"Premium API Access\") is not documented, and no input/output schema details are available beyond the basic x402 challenge metadata. The platform lists many endpoints on its homepage but provides no detailed documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-pricing","post-endpoint","json-response","no-api-key-required"],"categories":["api-platform","x402"],"synonyms":["low payment fee API","x402 paid API","USDC API access","Base network API","pay-per-request API","micropayment API","premium API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'","The specific functionality of /api/v1/item/43 ('Premium API Access') is entirely undocumented","No input or output schema provided beyond basic x402 challenge metadata","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/43","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/item/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. The specific functionality of /api/v1/item/43 is completely undocumented, with no input schema, output schema, or usage examples available. The listing is effectively a stub with a working payment gate.","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":"2026-04-18T19:45:38.357Z","embedding":[-0.027755737,-0.03387451,0.032806396,0.008331299,0.009414673,-0.04031372,-0.02909851,0.040100098,0.054260254,-0.064941406,0.039276123,-0.057006836,-0.02281189,-0.034088135,-0.022476196,0.020004272,0.015823364,0.0071258545,-0.04827881,0.032287598,0.032714844,-0.008834839,-0.01789856,0.027954102,0.0014543533,-0.015609741,0.0022029877,-0.009002686,-0.016235352,-0.030807495,0.028915405,-0.023712158,0.0033340454,0.019195557,-0.018707275,-0.011436462,0.0073127747,0.044189453,0.033416748,-0.024978638,0.0004067421,-0.054260254,0.02507019,-0.011039734,-0.031097412,0.0062179565,0.010643005,-0.023773193,-0.029388428,-0.0026168823,-0.022003174,0.014434814,-0.0072669983,0.0023670197,0.005004883,0.014892578,-0.008514404,-0.0021877289,0.0025424957,0.004219055,-0.005405426,-0.06335449,-0.027557373,0.01676941,-0.006046295,0.05718994,-0.011741638,0.04434204,-0.0035629272,0.07519531,0.036071777,0.03189087,0.048675537,-0.0045928955,0.016845703,-0.022415161,-0.033447266,0.034942627,-0.015686035,-0.0038337708,-0.033599854,0.011741638,-0.06744385,-0.013687134,-0.017318726,-0.06506348,-0.020324707,0.037841797,-0.022460938,0.0006136894,-0.086364746,-0.028076172,-0.0063591003,0.0044021606,0.008850098,0.0020885468,-0.019073486,0.0035095215,-0.013648987,0.035614014,0.020233154,-0.022583008,0.0287323,0.002456665,0.03729248,0.056640625,0.0132751465,0.025726318,0.006011963,-0.03189087,-0.017333984,0.022415161,-0.0065841675,-0.00034236908,0.016845703,0.02166748,-0.023468018,0.031173706,-0.01838684,0.021469116,-0.048675537,0.04953003,0.022644043,-0.0077934265,-0.014526367,-0.055480957,-0.015464783,0.0024490356,-0.029067993,-0.015792847,0.033966064,0.0007147789,0.03390503,-0.038848877,-0.049835205,0.013893127,-0.0181427,-0.030838013,-0.051971436,-0.019500732,0.029754639,-0.029891968,0.0074920654,0.023498535,-0.07885742,-0.0009636879,-0.032073975,0.010406494,-0.03552246,0.0050354004,0.005680084,0.0050354004,-0.019546509,-0.03048706,-0.029724121,-0.034851074,-0.0064086914,0.04550171,0.009094238,0.042877197,-0.018951416,0.012580872,0.0011930466,-0.005455017,0.02583313,0.027496338,0.013450623,-0.07904053,-0.08453369,-0.035003662,-0.023910522,-0.0064964294,-0.039611816,-0.0011548996,0.00182724,-0.06903076,-0.01020813,-0.021972656,0.010017395,-0.03048706,0.007881165,-0.032562256,0.014579773,-0.006187439,-0.0435791,-0.025619507,-0.04510498,0.052947998,0.028442383,0.01234436,0.02116394,-0.0030059814,0.03793335,0.0078125,-0.02897644,-0.028884888,0.020477295,-0.0087890625,0.026123047,-0.0073547363,0.008674622,-0.016937256,0.033569336,0.07086182,0.0075187683,-0.022018433,-0.0071640015,-0.020111084,-0.03515625,-0.049560547,0.008811951,0.0014533997,-0.017669678,0.038604736,-0.012992859,-0.029067993,-0.00033855438,0.008514404,0.011619568,0.058258057,0.0011711121,0.00894165,0.023361206,0.024719238,-0.029205322,0.043426514,0.026641846,0.01789856,-0.025177002,-0.044921875,0.02017212,0.040527344,-0.015991211,0.0074539185,-0.010108948,0.021530151,-0.009155273,-0.00022637844,0.0135269165,-0.011924744,-0.03768921,-0.055145264,-0.015205383,0.029251099,0.014076233,-0.043060303,-0.037475586,-0.06707764,0.03918457,0.049224854,0.05923462,-0.0032367706,0.01008606,-0.028808594,-0.010948181,-0.070007324,0.054901123,0.0826416,0.00013673306,-0.033416748,0.007118225,-0.004146576,-0.039794922,-0.0069732666,-0.0129776,-0.0049858093,-0.010627747,0.02571106,-0.03466797,0.010002136,0.02897644,0.03970337,0.045196533,-0.0135269165,-0.052703857,-0.030838013,0.003156662,0.0065231323,-0.025131226,-0.008483887,0.0041160583,0.019958496,0.035980225,0.0050201416,0.012435913,-0.011650085,0.0036773682,0.0074043274,-0.005874634,-0.018615723,-0.016418457,0.002565384,0.014381409,-0.06213379,0.019058228,-0.01852417,0.082092285,-0.054626465,0.0423584,-0.019210815,0.03201294,0.066223145,-0.001083374,-0.044525146,-0.0011949539,0.01826477,0.037078857,0.03463745,0.0085372925,-0.017059326,0.005935669,0.06335449,-0.02407837,0.0007452965,-0.003446579,0.024261475,0.03692627,0.0018339157,-0.060821533,-0.032287598,-0.016647339,-0.023712158,0.014183044,-0.020996094,0.023330688,-0.0010080338,0.00289917,-0.017501831,0.005218506,-0.04534912,0.0056266785,-0.020141602,-0.008338928,-0.04046631,-0.020111084,0.009231567,0.022842407,-0.007446289,0.01927185,0.030227661,0.037384033,-0.023651123,-0.030731201,-0.008857727,-0.026443481,-0.0073547363,0.005870819,0.010368347,0.016921997,0.04232788,-0.032684326,-0.008148193,0.04437256,0.009941101,0.031707764,-0.002702713,0.001666069,-0.06506348,-0.06506348,-0.020095825,-0.03970337,0.01360321,0.024276733,0.0010824203,0.054107666,-0.019332886,-0.016281128,-0.040161133,0.003194809,-0.036865234,0.01751709,0.051818848,-0.015808105,-0.04837036,0.009986877,0.0027446747,0.009216309,0.029571533,0.013092041,0.004425049,0.06951904,0.042419434,0.009422302,0.03036499,0.018829346,0.015060425,-0.0011434555,-0.01725769,-0.010299683,-0.03375244,0.037231445,-0.02748108,-0.01322937,-0.058685303,0.041931152,0.046020508,0.07159424,0.009506226,0.02293396,0.026947021,-0.027679443,0.023223877,-0.0045547485,-0.02180481,-0.020492554,-0.05368042,0.02357483,-0.0005555153,-0.0093688965,-0.028778076,0.022369385,0.0035171509,0.017669678,-0.036621094,0.039520264,-0.0037727356,-0.010437012,0.025039673,0.003107071,0.03427124,0.05038452,-0.0592041,0.018493652,0.01802063,-0.011962891,-0.007949829,0.044189453,-0.009880066,-0.006450653,-0.057769775,-0.030044556,-0.010932922,-0.008270264,-0.056365967,-0.0008673668,-0.0030765533,0.0066833496,0.029251099,-0.010757446,-0.027572632,0.0058517456,-0.0236969,-0.05316162,-0.019805908,-0.04727173,0.0059280396,0.03967285,-0.017166138,-0.0082473755,0.0015487671,0.0019683838,-0.0026226044,0.011016846,0.01625061,0.018737793,-0.03543091,0.029388428,-0.003982544,0.00630188,0.009689331,0.024871826,0.026351929,0.024017334,0.051330566,0.016448975,-0.025924683,-0.04925537,0.023513794,-0.0335083,0.0014038086,-0.012207031,-0.025177002,-0.0048599243,-0.0075683594,-0.011856079,-0.036224365,0.002840042,-0.028289795,-0.0065956116,0.033325195,-0.04537964,-0.0309906,-0.064086914,-0.029022217,-0.0065231323,0.091674805,0.037475586,-0.003850937,-0.070251465,-0.007247925,0.010932922,0.00724411,0.025161743,-0.014564514,-0.019866943,-0.024780273,-0.04748535,-0.011993408,-0.016540527,0.026275635,-0.017822266,-0.015975952,0.035247803,-0.011932373,0.003686905,-0.015258789,0.003578186,0.023544312,-0.028686523,-0.0006403923,-0.023910522,0.037017822,0.016113281,0.003967285,-0.05355835,0.061401367,0.011688232,0.038848877,-0.043060303,0.0061569214,-0.004398346,0.027557373,0.015838623,-0.028076172,-0.0036334991,0.0010976791,-0.032592773,-0.064819336,0.039611816,-0.0262146,0.028686523,0.010948181,0.005844116,0.03729248,-0.016113281,-0.0011882782,0.028259277,-0.022323608,0.003068924,-0.021392822,-0.03375244,-0.015602112,-0.0069885254,-0.03277588,0.02154541,-0.006778717,0.017715454,-0.016448975,-0.027999878,0.029968262,0.007335663,0.006378174,0.021377563,0.010612488,0.0067367554,0.047790527,0.009017944,-0.030639648,0.025650024,0.0005931854,0.008895874,-0.0026626587,0.04348755,0.03878784,-0.0047073364,-0.015991211,-0.0065460205,-0.01927185,-0.032958984,-0.0055732727,0.0063323975,0.025619507,0.0008568764,-0.028839111,0.01626587,0.022277832,-0.030929565,-0.023803711,0.0004911423,0.032592773,-0.039886475,0.009490967,0.010353088,0.047729492,-0.030090332,0.006881714,0.007411957,0.03012085,0.021194458,0.010421753,-0.024597168,0.013557434,-0.016830444,0.011650085,-0.013511658,-0.014801025,0.01890564,0.0030517578,0.0178833,0.019943237,0.00422287,-0.017715454,-0.02748108,0.01826477,-0.0059661865,-0.020187378,0.030548096,0.022644043,0.0134887695,-0.023117065,0.014343262,0.021270752,-0.02468872,-0.022827148,-0.024978638,0.03265381,0.008720398,-0.00008255243,0.009460449,0.01083374,0.017150879,-0.06335449,0.0040245056,0.0021572113,0.028076172,-0.025619507,-0.034484863,-0.03842163,-0.0039901733,0.019515991,0.009933472,0.010940552,0.024047852,0.00774765,-0.0012149811,0.038024902,0.002714157,0.0012607574,-0.013595581,-0.04574585,-0.022583008,0.0019006729,0.0013980865,-0.031311035,0.007972717,-0.020507812,-0.021270752,0.002412796,-0.019515991,-0.0051193237,-0.0010070801,0.005340576,0.03970337,-0.0026416779,0.017410278,-0.017196655,-0.031021118,0.0076942444,-0.00024485588,0.030914307,-0.022735596,0.013374329,-0.023910522,-0.0035133362,0.001490593,0.005329132,0.032196045,0.027923584,0.014350891,0.04852295,-0.031982422,0.03756714,-0.031677246,0.013412476,0.0069618225,-0.045318604,-0.013023376,-0.038208008,-0.02508545,0.042144775,-0.017242432,0.0032672882,-0.016967773,-0.0335083,-0.020599365,-0.047698975,0.01159668,0.024887085,0.047821045,-0.039093018,0.0026283264,0.016967773,0.016983032,-0.022201538,0.005393982,0.00081539154,0.028182983,0.02230835,-0.0022602081,-0.028259277,-0.026733398,-0.012687683,0.011489868,-0.0491333,-0.050598145,-0.0050354004,0.008888245,0.0016832352,-0.0008010864,-0.023452759,-0.026473999,0.008804321,-0.033813477,0.0059394836,0.0035190582,0.031280518,0.014221191,-0.023468018,-0.013504028,0.021347046,-0.0262146,0.024032593,0.007171631,-0.0023670197,-0.03793335,-0.009651184,0.028701782,0.027008057,0.005340576,-0.011878967,-0.010719299,-0.025512695,-0.05532837,0.015701294,0.0042915344,-0.006210327,-0.00365448,0.007610321,-0.046813965,-0.010017395,-0.029251099,0.0026721954,0.018630981,0.017181396,-0.004005432,-0.009841919,-0.012840271,0.0004312992,-0.015312195,-0.026687622,0.00724411,0.011001587,-0.0046920776,0.019577026,0.036346436,-0.0063171387,-0.010749817,0.009147644,-0.0001654625,0.019241333,-0.034332275,0.010551453,-0.004638672,0.016418457,-0.02130127,-0.011627197,-0.024520874,-0.003358841,0.07647705,-0.0007071495,0.013114929,-0.010528564,-0.013633728,0.008872986,0.041168213,-0.051239014,-0.007583618,-0.029754639,0.020385742,-0.022949219,0.015296936,0.0121536255,0.012893677,-0.031341553,-0.045440674,-0.01537323,0.0115356445,0.008323669,-0.055358887,-0.0154800415,-0.07165527,-0.008529663,-0.027236938,-0.013084412,-0.00077676773,-0.00027251244,-0.025802612,-0.06604004,-0.0059013367,0.060394287,0.0042533875,0.015182495,-0.004802704,0.005718231,0.029830933,-0.027954102,-0.002544403,0.027267456,-0.028945923,-0.01109314,-0.02281189,0.03225708,-0.0048294067,-0.007949829,0.016830444,0.01676941,0.009132385,0.0023994446,0.015113831,-0.005218506,0.014640808,-0.003545761,0.013961792,-0.012573242,-0.016708374,0.042755127,-0.04925537,0.024780273,0.011070251,-0.00983429,0.003232956,0.03842163,0.04119873,-0.037200928,-0.0032920837,0.04055786,0.028289795,0.031799316,-0.028503418,0.03515625,-0.0073280334,-0.006263733,0.014167786,-0.027526855,-0.008644104,-0.035125732,-0.0423584,0.015403748,0.005432129,-0.0064048767,-0.027053833,0.010482788,0.005432129,0.01739502,-0.015701294,-0.026168823,-0.019180298,-0.009277344,0.008628845,0.00057411194,0.005558014,0.0022735596,0.019989014,0.021835327,0.034484863,-0.010147095,-0.0059165955,0.02104187,0.01625061,-0.010932922,0.002532959,0.025619507,0.0016355515,0.01725769,0.019119263,0.02029419,-0.055847168,-0.0062217712,-0.0019626617,0.0049095154,-0.0034637451,-0.015686035,0.0033092499,0.002325058,0.007457733,-0.0021915436,-0.043792725,0.010826111,-0.02909851,-0.024246216,-0.023956299,-0.014564514,0.028778076,0.02079773,0.0002734661,0.0037136078,-0.017623901,0.045684814,0.010406494,-0.005039215,0.030960083,0.038482666,0.012809753,-0.030700684,-0.012954712,0.0032997131,0.002500534,-0.0042533875,-0.03338623,0.015296936,0.042816162,-0.0082092285,0.009262085,-0.0035820007,0.01727295,0.001364708,0.0077781677,-0.005012512,0.03540039,-0.0154418945,0.03567505,-0.05114746,0.0031433105,0.039886475,0.020523071,-0.008811951,-0.014732361,-0.02432251,0.030853271,0.017120361,-0.008972168,0.04547119,-0.00554657,0.03756714,-0.03717041,-0.029052734,-0.007419586,-0.013961792,-0.022735596,0.020736694,-0.0010786057,0.022277832,0.021209717,-0.027420044,0.033599854,-0.04360962,0.013618469,0.019927979,-0.002811432,-0.021377563,-0.022323608,-0.010765076,-0.020126343,-0.011177063,0.0074043274,-0.0050735474,0.04827881,0.023498535,0.025146484,0.04486084,0.01776123,0.01576233,-0.040252686,-0.03616333,-0.02067566,-0.017211914,0.027999878,-0.00037169456,0.04837036,0.034973145,-0.0065231323,0.036987305,0.027526855,0.022903442,0.0061149597,0.0155181885,-0.006034851,0.013328552,-0.031829834,0.039733887,-0.0012454987,0.039978027,-0.028411865,0.016647339,-0.00793457,0.029159546,-0.031402588,0.03164673,0.052001953,0.027496338,-0.013214111,0.043060303,-0.0006942749,-0.012489319,-0.016647339,-0.019470215,0.05819702,-0.003440857,0.048309326,0.0287323,0.010955811,-0.022140503,0.034973145,-0.014312744,-0.012290955,0.04751587,0.03378296,-0.026367188,-0.008926392,-0.008232117,0.012145996,-0.05142212,-0.023483276,0.0135269165,0.011489868,-0.011146545,-0.008399963,-0.013404846,-0.01612854,0.011016846,0.0020751953,0.00096416473,-0.0029850006,0.030960083,0.032714844,0.0040397644,0.03463745,-0.007118225,0.042907715,-0.033569336,-0.023925781,0.02168274,0.01234436,0.003376007,-0.00031757355,0.03579712,-0.0031223297,0.044555664,0.03375244,-0.014350891,-0.018066406,0.02381897,0.011993408,0.0027751923,0.039794922,0.039794922,-0.0042648315,0.023086548,0.034423828,0.018447876,-0.04776001,0.0049743652,-0.014457703,0.016723633,-0.009735107,-0.010017395,-0.0010375977,-0.0066108704,0.014625549,0.0027256012,-0.004722595,0.021026611,0.019561768,-0.0057258606,0.00016021729,-0.010810852,0.026062012,-0.018478394,-0.013748169,0.0021743774,-0.020614624,0.02532959,0.027679443,0.034454346,-0.030548096,0.028579712,0.004272461,-0.013710022,-0.00049829483,0.021194458,-0.011604309,-0.005027771,-0.020950317,-0.0052719116,-0.040405273,0.009605408,0.020126343,-0.022079468,0.011482239,0.015792847,-0.005622864,-0.005771637,0.034179688,0.026382446,-0.020355225,-0.014862061,-0.026947021,0.026275635,0.04135132,0.011253357,0.000006377697,-0.023468018,-0.0049819946,0.012458801,-0.0030937195,0.011207581,0.0060920715,-0.0032424927,-0.018936157,0.018844604,0.047332764,0.030776978,0.03692627,-0.011062622,-0.0028839111,0.0044898987,0.027999878,0.028762817,-0.00730896,-0.013465881,0.029708862,-0.011604309,0.02784729,0.025558472,-0.00031757355,0.030151367,-0.015022278,-0.0037841797,0.0073661804,-0.02760315,0.028182983,-0.02078247,0.003200531,-0.020370483,0.030914307,-0.0211792,-0.03869629,0.015686035,-0.008056641,-0.0066871643,-0.015258789,0.0024337769,0.008468628,0.0284729,0.03717041,0.015571594,-0.022018433,0.064086914,-0.016586304,0.043060303,-0.006752014,0.0077209473,0.046142578,0.019302368,0.039489746,0.019058228,0.006340027,-0.030181885,0.01285553,0.034423828,0.020492554,0.010498047,0.006916046,-0.0158844,0.038848877,-0.009223938,0.039154053,0.0016345978,-0.0037002563,0.012794495,-0.008705139,-0.015022278,0.005554199,-0.021499634,0.018630981,0.0473938,-0.024353027,-0.012359619,-0.014259338,-0.0035552979,0.036315918,0.0016231537,0.004524231,-0.0012350082,-0.03375244,0.01234436,-0.035461426,-0.010627747,0.008399963,0.01725769,-0.039489746,-0.01285553,0.024017334,0.031677246,-0.029647827,0.026550293,0.012969971,-0.005180359,0.017959595,0.034942627,-0.0109939575,0.029052734,-0.021652222,0.038604736,0.052734375,0.0033626556,-0.0059432983,0.01864624,0.0022621155,-0.022094727,0.01374054,0.026947021,0.008049011,0.0077590942,-0.0074653625,0.008903503,0.0050239563,0.016693115,0.00497818,0.009155273,-0.009239197,-0.0044670105,0.009963989,0.009605408,0.0031585693,0.0057678223,-0.01222229,-0.008346558,0.016052246,0.030197144,0.023132324,-0.03765869,-0.00006347895,0.007835388,0.01083374,-0.020965576,-0.009971619,0.0011320114,-0.028701782,0.018737793,0.023071289,-0.0012359619,0.008605957,-0.031555176,-0.008010864,0.040222168,0.0019817352,0.007156372,0.0007543564,-0.0042686462,0.0040893555,-0.013923645,0.0012779236,-0.005607605,-0.004142761,0.016738892,0.021438599,0.00048589706,-0.02619934,0.023391724,0.009231567,0.012207031,0.0069007874,-0.027267456,0.017059326,-0.010398865,-0.012145996,0.008766174,0.006980896,-0.015701294,-0.0043678284,-0.037719727,0.032104492,0.047454834,-0.004940033,-0.014221191,0.0075302124,0.031341553,0.019989014,0.028549194,0.0019397736,0.039245605,0.015075684,-0.02960205,-0.042633057,0.021896362,-0.017654419,-0.03894043,0.012573242,-0.01121521,-0.015975952,0.017044067,0.0028762817,-0.01109314,-0.030227661,-0.02330017,0.0051231384,-0.013389587,0.02734375,-0.013023376,0.0030517578,-0.029724121,-0.01008606,0.0057296753,-0.02432251,-0.028701782,-0.030014038,0.010925293,-0.010475159,-0.056274414,-0.0047798157,-0.018051147,0.011474609,-0.023345947,0.008392334,-0.0024929047,0.021972656,-0.01737976,0.0028495789,0.021774292,0.0362854,0.0068359375,0.0018577576,0.028045654,-0.026535034,-0.030181885,-0.008857727,0.009605408,-0.012023926,0.023117065,-0.009056091,0.040130615,0.019012451,-0.012893677,-0.008262634,-0.010154724,-0.003742218,0.0030117035,-0.016342163,-0.02078247,0.019470215,0.019515991,-0.0099105835,-0.0060768127,0.035980225,-0.02507019,-0.016723633,0.026046753,0.040222168,0.017211914,0.033172607,-0.00014281273,0.0025520325,-0.020233154,0.013648987,-0.011070251,0.012550354,-0.008628845,-0.00031971931,-0.008277893,0.0033817291,0.020080566,0.006034851,-0.0071258545,0.035614014,0.0032138824,-0.0090789795,0.029067993,0.023162842,0.011184692,-0.018569946,-0.027496338,0.035217285,0.044006348,0.005882263,0.007858276,-0.0023860931,0.009475708,-0.014205933,0.009742737,0.015533447,-0.016784668,-0.03982544,-0.012298584,-0.021118164,0.033081055,0.004219055,0.019714355,-0.012191772,0.00844574,-0.011619568,-0.03652954,-0.019195557,0.025527954,0.0015029907,-0.015899658,0.0022621155,0.0017776489,0.00819397,-0.040222168,-0.0033454895,-0.04336548,-0.037017822,-0.030700684,-0.01574707,0.023834229,0.02217102,-0.0082092285,0.0067367554,-0.012626648,-0.007358551,0.008476257,0.024230957,-0.019943237,-0.0036334991,0.03451538,0.011253357,-0.011413574,0.024871826,-0.00065517426,-0.0011825562,0.0045928955,-0.0121154785,0.023132324,-0.01828003,0.028839111,0.010253906,-0.0099487305,0.02986145,-0.015586853,0.021743774,-0.01928711,0.018218994,-0.010185242,-0.004211426,0.040771484,-0.03302002,-0.024841309,0.011459351,-0.01890564,-0.02923584,0.011352539,0.03375244,0.03326416,-0.024291992,0.04196167,-0.023345947,-0.008102417,0.008636475,0.0057525635,-0.01663208,0.008010864,0.048858643,-0.007446289,0.0027923584,0.0063819885,-0.01737976,-0.03225708,-0.010383606,0.0032024384,0.00056791306,-0.008132935,0.023880005,0.015930176,0.042877197,-0.01234436,0.014511108,0.027297974,-0.0073394775,0.030441284,0.009895325,0.029754639,-0.008705139,-0.02444458,0.0020427704,0.005924225,-0.025436401,0.0036182404,0.007785797,0.014854431,-0.043914795,0.017471313,-0.0022735596,0.022094727,-0.014343262,0.002243042,-0.023376465,0.0052604675,-0.02784729,0.012924194,-0.030960083,0.03161621,0.048583984,0.022613525,0.013252258,-0.010810852,-0.03225708,0.027816772,0.06842041,-0.025299072,-0.0357666,-0.012435913,0.008262634,-0.0019989014,-0.006046295,0.011924744,-0.027679443,-0.022109985,0.0066833496,-0.010253906,-0.0033187866,0.0072021484,0.020690918,0.009353638,-0.009536743,-0.0041046143,0.023513794,-0.011413574,-0.0033473969,0.017303467,-0.0035095215,0.026779175,0.025146484,-0.024765015,0.015182495,0.012207031,-0.044067383,0.041259766,-0.015151978,0.024780273,-0.016174316,0.013893127,-0.03704834,-0.003742218,-0.017211914,0.019485474],"createdAt":"2026-04-18T18:31:56.661Z","updatedAt":"2026-04-25T07:31:50.909Z","lastSeenAt":"2026-04-25T07:31:50.909Z","tsv":"'/api/v1/item/43':83,127,183 '/request':17,34 '0.02':16,33,102,141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '20000':132 '6':136 'Base network API' 'USDC API access' 'accept':91 'access':89,118,186 'across':49 'address':151 'advertis':99,145 'ai':10,27,52 'analyt':51 'api':4,21,41,88,109,163,185 'application/json':95 'avail':196 'base':7,24,73,155 'basic':199 'behind':182 'beyond':197 'categori':59 'challeng':122,201 'coin':78 'connect':172 'consist':142 'content':178 'data':9,26,50 'decim':137 'detail':194,214 'doc':162 'document':157,189,215 'enabl':40 'endpoint':14,31,48,61,81,126,207 'equal':140 'expos':44 'extrem':159 'financ':11,28,55 'flat':101 'function':181 'homepag':210 'howev':119 'infrastructure/utility':58 'input/output':192 'instant':117 'json-response' 'key':110 'learn':54 'limit':113 'list':85,205 'low payment fee API' 'lowpaymentfee.com':35 'machin':53 'made':149 'mani':206 'maxamountrequir':130 'metadata':202 'micropayment API' 'minimum':115 'model':106 'network':74,156 'no-api-key-required' 'offer':8,25 'page':167 'particular':125 'pay-per-request API' 'payabl':3,20,63 'payment':147 'per':65,103 'per-request':64 'per-request-pricing' 'platform':5,22,42,98,204 'post':92 'post-endpoint' 'premium':87,184 'premium API access' 'price':105,146,164 'prompt':174 'protocol':70 'provid':212 'rate':112 'readm':166 'render':169 'represent':138 'request':66,93,104 'respons':96 'return':94 'schema':193 'spars':160 'specif':80,180 'specifi':128 'usd':77 'usdc':76,134 'usdc-base-network' 'use':75 'util':13,30 'varieti':46 'via':67 'wallet':173 'web3':56 'x402':2,19,39,69,121,200 'x402 paid API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"4883d3cc-036d-461a-9b98-ba2272d373f2","listingId":"a07eb002-b0e5-470a-93bd-37fab98e4194","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/item/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:56.661Z"}],"sources":[{"listingId":"a07eb002-b0e5-470a-93bd-37fab98e4194","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:56.661Z","lastSeenAt":"2026-04-25T07:31:50.909Z"}],"details":{"listingId":"a07eb002-b0e5-470a-93bd-37fab98e4194","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/43 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; include X-PAYMENT header with valid USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/item/43","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/43"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/item/43"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data via x402 micropayments without traditional API key signup","Programmatic agent-driven API consumption with per-call USDC payments on Base","Exploring x402 protocol integration for pay-as-you-go API access"],"bestFor":["Developers experimenting with x402 protocol payments","Agents needing keyless, pay-per-request API access on Base","Users who want to avoid subscription commitments for API usage"],"notFor":["Users needing detailed API documentation or well-defined schemas before integration","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.142Z"},"updatedAt":"2026-04-25T07:31:50.909Z"}}