{"id":"c7497a19-d02d-4058-adbd-9d1d3164d656","shortId":"ndaXCY","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/147` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, no rate limits. Callers attach an `X-PAYMENT` header with a signed payment to access the resource.\n\nThe wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nThe specific `/api/v1/messages/147` endpoint's purpose is unclear — the description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns. The platform's documentation pages (pricing, README, API docs) all resolve to a minimal \"Connect wallet\" page with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["The specific endpoint /api/v1/messages/147 has no documentation explaining its purpose or expected input/output","No OpenAPI specification or request/response schema is available","All documentation pages (pricing, README, API) resolve to minimal 'Connect wallet' pages with no content","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/147","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/messages/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is zero documentation about what /api/v1/messages/147 actually does or returns. No OpenAPI spec, no request/response schemas, and no examples are available. The doc pages resolve to empty 'Connect wallet' stubs.","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":"2026-04-21T23:04:02.846Z","embedding":[-0.02708435,-0.024932861,0.044403076,0.013290405,0.0037670135,-0.023513794,-0.046081543,0.030914307,0.076416016,-0.07562256,0.008110046,-0.040374756,-0.03543091,-0.024337769,-0.016738892,0.011169434,-0.009712219,0.017913818,-0.033447266,0.041809082,0.021591187,-0.0104599,-0.040222168,0.026977539,-0.0042152405,-0.031219482,0.00077724457,-0.014167786,-0.01737976,-0.032348633,0.06439209,-0.030914307,-0.010047913,-0.0050201416,-0.022445679,-0.0060424805,-0.0071868896,0.01727295,0.03555298,-0.015914917,-0.015640259,-0.054626465,0.00047373772,-0.021209717,-0.052947998,-0.0012636185,0.008338928,-0.003200531,0.014129639,0.006286621,-0.045532227,-0.015075684,-0.0090408325,0.021484375,0.0033817291,0.0026397705,0.0017662048,-0.010421753,0.019622803,0.010665894,-0.0053138733,-0.050445557,-0.02734375,-0.012718201,-0.0057144165,0.05633545,-0.008125305,0.04296875,0.003736496,0.05670166,0.049438477,0.028671265,0.011886597,0.0070877075,0.0051612854,-0.0035057068,-0.005973816,0.07330322,-0.020095825,-0.025131226,-0.00014412403,0.0013313293,-0.058898926,0.009941101,-0.015655518,-0.04043579,-0.014038086,0.013549805,-0.028533936,0.03262329,-0.07897949,-0.017105103,-0.0066986084,0.0028457642,0.018875122,-0.02041626,-0.0099105835,0.02319336,-0.009307861,0.017608643,0.0023651123,-0.050811768,0.007507324,0.014961243,0.022537231,0.03805542,0.017456055,0.016738892,0.0038833618,-0.012779236,-0.060272217,0.029266357,-0.012611389,-0.007736206,0.0008983612,0.012863159,-0.014389038,0.015380859,-0.024002075,0.01802063,-0.059692383,0.04345703,0.018920898,0.008110046,-0.0006532669,-0.05734253,-0.017562866,0.014442444,-0.020477295,-0.012687683,0.013084412,0.017318726,0.030319214,-0.022369385,-0.03466797,0.0042304993,-0.01399231,-0.025131226,-0.05090332,-0.042938232,0.039398193,-0.022018433,0.016647339,0.027938843,-0.09942627,-0.013931274,-0.044555664,-0.0061302185,-0.03048706,-0.0061683655,-0.009628296,0.031066895,-0.016464233,-0.026473999,-0.020767212,-0.009536743,0.010505676,0.025741577,-0.02709961,0.038482666,-0.023788452,0.017456055,0.01826477,0.002023697,0.017913818,0.02104187,0.01725769,-0.104003906,-0.08770752,-0.02078247,-0.013290405,-0.026107788,-0.035308838,0.0059051514,-0.0073890686,-0.06341553,-0.016601562,-0.028045654,-0.006259918,-0.038879395,0.002527237,-0.027648926,0.0040130615,-0.025131226,-0.051086426,-0.025344849,-0.026672363,0.057128906,0.024780273,0.023803711,0.028640747,-0.020339966,0.07495117,0.04107666,-0.022399902,-0.013076782,0.011962891,-0.020095825,0.019012451,-0.013420105,0.0037174225,-0.03781128,0.053497314,0.05331421,0.0011548996,-0.013420105,-0.013397217,-0.04837036,-0.037322998,-0.036468506,0.03048706,0.009757996,-0.0031871796,0.03741455,-0.040985107,-0.04559326,-0.019454956,0.011398315,-0.009109497,0.058807373,0.016418457,0.008087158,0.024047852,0.014228821,-0.053344727,0.02822876,0.03152466,0.009529114,-0.032714844,-0.009483337,0.03189087,0.03302002,-0.014709473,0.0016717911,-0.0032653809,0.030517578,-0.016159058,0.00957489,0.021377563,0.004386902,-0.017715454,-0.03314209,-0.016448975,0.038085938,-0.0010652542,-0.024932861,-0.027160645,-0.08325195,0.04675293,0.042175293,0.05822754,-0.017684937,0.0060691833,-0.014190674,-0.0045433044,-0.06951904,0.043426514,0.064453125,-0.0034770966,-0.011154175,0.021743774,-0.0030384064,-0.021728516,0.011985779,0.00044441223,-0.0340271,-0.0027923584,0.010513306,-0.060424805,-0.0021705627,0.022644043,0.01360321,0.05596924,0.01386261,-0.048095703,-0.00027632713,-0.012641907,-0.009315491,-0.02192688,-0.0031986237,-0.009803772,0.010025024,0.023208618,-0.0034656525,0.008903503,-0.007511139,0.03152466,-0.008110046,-0.014533997,-0.02456665,-0.035369873,-0.004425049,0.0018978119,-0.06500244,0.01701355,0.004463196,0.08538818,-0.03314209,0.024902344,-0.013259888,0.027893066,0.034362793,0.005340576,-0.04751587,0.017562866,0.0362854,0.015274048,0.039398193,0.0033950806,-0.049713135,0.0028038025,0.061401367,-0.009399414,-0.010627747,-0.015312195,0.0040016174,0.029785156,-0.016952515,-0.05609131,-0.034820557,-0.007980347,-0.021835327,0.015380859,-0.025405884,-0.0042381287,-0.012756348,0.011497498,-0.008781433,0.0039787292,-0.010375977,0.03062439,-0.0135269165,0.007648468,0.005168915,-0.023971558,0.023452759,0.00032305717,-0.0035877228,-0.0036334991,0.02760315,0.031097412,-0.014099121,-0.033813477,-0.018218994,-0.01158905,-0.014854431,0.0034046173,0.022354126,0.030029297,0.06072998,-0.024291992,0.008178711,0.03414917,0.016479492,0.035980225,-0.0066566467,0.010986328,-0.06088257,-0.049102783,-0.033294678,-0.037231445,0.01309967,0.01878357,0.00013077259,0.057281494,0.014793396,-0.040252686,-0.040130615,0.028793335,-0.04650879,-0.0004968643,0.02330017,-0.011199951,-0.03829956,-0.015052795,-0.0035896301,-0.0035324097,0.031585693,0.0023918152,0.032440186,0.06793213,0.04663086,-0.008354187,0.015533447,0.0021896362,0.036071777,0.001499176,-0.020843506,-0.030136108,-0.004573822,0.034729004,-0.016113281,-0.037139893,-0.06072998,0.045074463,0.045410156,0.056396484,-0.004131317,0.013504028,0.030319214,-0.0035057068,0.0041770935,-0.036621094,0.0012989044,-0.025039673,-0.038909912,0.02015686,-0.010131836,0.0035324097,-0.020217896,0.041107178,-0.010917664,0.018493652,-0.011024475,0.040283203,-0.011451721,0.023239136,0.0043411255,0.011764526,0.041412354,0.072265625,-0.053527832,0.026901245,0.034210205,-0.028305054,0.017440796,0.053955078,-0.020217896,-0.021347046,-0.053955078,-0.019073486,-0.014175415,-0.0036029816,-0.064453125,0.021469116,0.00050735474,0.02960205,0.034851074,-0.019454956,-0.002374649,-0.015403748,-0.0008196831,-0.07446289,-0.007537842,-0.03250122,0.003124237,0.043762207,-0.00919342,-0.002773285,-0.008323669,-0.018844604,-0.019195557,0.010108948,0.03277588,-0.01020813,-0.03955078,0.04385376,0.029663086,-0.00010740757,0.012252808,0.028518677,0.012428284,0.025405884,0.05368042,-0.0006093979,-0.030319214,-0.05770874,0.010734558,-0.05343628,0.023849487,0.007904053,-0.015930176,0.0005531311,-0.00033140182,-0.029342651,-0.03857422,0.005142212,-0.04385376,0.013633728,0.016464233,-0.023651123,-0.026123047,-0.05682373,-0.020553589,-0.00052547455,0.07397461,0.022003174,-0.009025574,-0.05154419,0.008102417,0.009712219,0.003353119,0.032226562,-0.0143585205,-0.025665283,-0.024154663,-0.047088623,-0.0009121895,-0.023376465,0.011367798,-0.010398865,-0.019424438,0.020599365,-0.006248474,0.02897644,-0.0017557144,0.006652832,0.024032593,-0.03878784,-0.005378723,-0.004058838,0.050354004,0.006416321,-0.009246826,-0.030136108,0.033996582,0.021377563,0.037963867,-0.03274536,-0.00712204,0.009666443,0.011909485,0.026443481,-0.012214661,-0.013397217,-0.014137268,-0.059020996,-0.04852295,0.029190063,-0.02217102,0.031799316,0.02468872,0.023712158,0.010398865,-0.0040626526,0.0004389286,-0.0031356812,-0.031173706,-0.0025634766,-0.018295288,-0.029266357,-0.022613525,-0.002117157,-0.008605957,0.018615723,-0.017211914,0.013458252,0.010940552,-0.022064209,0.023040771,0.018508911,-0.0063972473,0.034851074,0.0031166077,0.02645874,0.03479004,-0.00077819824,-0.05001831,0.028747559,-0.005531311,0.020050049,-0.014556885,0.046844482,0.036376953,-0.02003479,-0.006248474,-0.002538681,-0.009979248,-0.020217896,0.0067367554,0.011695862,0.011161804,-0.01889038,-0.041809082,0.017944336,0.01399231,-0.024246216,-0.025009155,0.019851685,0.009918213,-0.027130127,0.02128601,0.0211792,0.0496521,-0.036315918,0.009048462,0.017227173,0.03604126,0.036499023,0.013244629,-0.00086402893,0.010910034,-0.016296387,0.004081726,-0.019134521,-0.0026512146,0.015701294,-0.0018196106,0.030776978,0.030136108,0.02305603,-0.02809143,-0.033050537,0.01663208,0.00045609474,-0.012428284,0.017059326,0.008460999,0.023269653,-0.02229309,0.020935059,0.011993408,-0.014663696,-0.009010315,-0.00793457,0.022125244,-0.014266968,-0.020126343,0.035064697,0.013679504,0.023712158,-0.049194336,-0.0016889572,-0.0013408661,0.0135269165,-0.017150879,-0.041870117,-0.043792725,0.026062012,0.018218994,0.016311646,0.029342651,0.041259766,-0.011917114,0.0037002563,0.029953003,0.0042800903,-0.0118255615,-0.018447876,-0.03918457,-0.025146484,-0.0029201508,0.0112838745,-0.043304443,0.02470398,-0.010551453,-0.03164673,0.0013008118,-0.011581421,-0.0012254715,-0.015235901,0.01020813,0.033935547,0.016921997,0.020324707,-0.0121536255,-0.023330688,-0.002210617,0.006881714,0.01638794,-0.05307007,0.016113281,-0.0077285767,0.009902954,0.0064315796,0.010948181,0.011619568,0.02381897,0.008071899,0.03543091,-0.039276123,0.049468994,-0.03829956,0.025497437,0.010246277,-0.04296875,-0.0031261444,-0.0413208,-0.00919342,0.042144775,-0.026123047,-0.024093628,-0.033111572,-0.021575928,-0.009841919,-0.046875,0.019729614,0.04257202,0.047058105,-0.026870728,0.009643555,-0.0016775131,0.00447464,-0.01737976,0.012908936,-0.0025081635,0.0112838745,0.029449463,0.00497818,-0.0115356445,-0.028442383,-0.026626587,-0.007286072,-0.041412354,-0.052246094,-0.0065727234,0.0015363693,-0.01285553,-0.01033783,-0.019500732,-0.030548096,-0.006679535,-0.037353516,0.0047073364,-0.0011959076,0.023269653,0.0059890747,-0.027755737,0.011604309,0.020492554,-0.011009216,0.03894043,0.0011482239,0.0014514923,-0.03463745,0.013542175,0.019622803,0.02128601,0.0032844543,-0.0004389286,-0.0076904297,-0.0068626404,-0.04727173,-0.004760742,-0.004638672,-0.026977539,-0.005722046,0.0019893646,-0.047027588,0.0009889603,-0.009742737,-0.0020484924,0.038482666,0.0022602081,0.01020813,-0.01209259,0.009178162,-0.0085372925,-0.01638794,-0.028045654,0.031433105,0.010498047,0.00015842915,0.031219482,0.03488159,0.018341064,-0.011581421,0.01033783,0.015472412,0.026031494,-0.01940918,0.018341064,-0.020309448,0.024765015,-0.015731812,-0.0065689087,-0.03793335,0.002620697,0.073913574,-0.00504303,-0.013542175,-0.008163452,-0.008613586,0.017593384,0.024917603,-0.04724121,0.0015287399,-0.037017822,0.016677856,-0.020202637,0.019241333,0.0067367554,0.024780273,-0.022506714,-0.04486084,-0.011405945,0.0009860992,-0.017364502,-0.07196045,-0.02319336,-0.061401367,0.016494751,-0.001364708,-0.020904541,0.0002309084,0.004699707,-0.0034103394,-0.07122803,0.0135269165,0.04159546,0.0072669983,0.029769897,-0.0078048706,0.012496948,0.018859863,-0.023208618,-0.002960205,0.03390503,-0.027008057,-0.011383057,-0.021224976,0.019500732,-0.004108429,-0.023727417,0.002828598,0.003528595,0.020874023,-0.014579773,0.004966736,-0.014167786,0.033203125,-0.026504517,0.024536133,-0.00944519,-0.010108948,0.04812622,-0.053833008,0.028259277,0.016143799,-0.0017986298,0.0010480881,0.02279663,0.048828125,-0.036468506,-0.010421753,0.0064353943,0.015167236,0.037384033,-0.027191162,0.03744507,0.022720337,-0.022476196,0.027160645,-0.00073194504,-0.015068054,-0.03765869,-0.02053833,0.025909424,0.0047187805,0.0023269653,-0.022842407,0.018737793,0.016677856,-0.02079773,0.008239746,-0.008026123,-0.02835083,-0.031341553,-0.010826111,0.012962341,-0.0028095245,-0.004283905,0.019699097,0.007827759,0.025772095,0.012458801,-0.013328552,-0.00033903122,0.034118652,-0.014266968,0.007003784,0.027786255,0.0033454895,0.02116394,0.029006958,0.013694763,-0.04135132,0.0019836426,-0.026351929,-0.022918701,0.0059432983,-0.009147644,-0.0063934326,-0.003736496,0.010871887,-0.008399963,-0.02645874,0.0064735413,-0.016113281,-0.030181885,-0.00831604,-0.0013332367,0.021820068,0.0034656525,0.013748169,0.012275696,-0.008476257,0.05859375,-0.010406494,-0.015823364,0.010925293,0.025634766,0.018707275,-0.040985107,-0.009483337,-0.006855011,-0.0065727234,0.003873825,-0.027938843,0.022659302,0.04815674,-0.010932922,0.0063285828,0.01574707,0.027648926,-0.018630981,0.0035743713,-0.011444092,0.01902771,-0.013305664,0.029006958,-0.048339844,0.025848389,-0.0015592575,0.009925842,-0.0014066696,-0.016464233,-0.027526855,0.026763916,0.00080537796,-0.005432129,0.03793335,0.0012979507,0.01977539,-0.020141602,-0.011352539,-0.00027799606,-0.02760315,-0.023635864,0.027008057,-0.0049705505,0.008239746,0.0037231445,-0.02671814,0.0362854,-0.030700684,-0.0009717941,0.008804321,-0.008995056,-0.010559082,-0.023132324,-0.01927185,0.020324707,-0.021652222,-0.0034923553,-0.0017776489,0.05682373,0.007972717,0.04168701,0.025817871,0.011047363,0.00028657913,-0.04788208,-0.034057617,-0.00012350082,-0.020370483,0.027755737,-0.0231781,0.04434204,0.03994751,-0.013671875,0.0345459,0.03515625,0.025299072,-0.003665924,0.012229919,-0.014450073,0.014503479,-0.020843506,0.03378296,0.00111866,0.03527832,-0.016174316,0.029266357,0.02911377,0.016830444,-0.032409668,0.034210205,0.064819336,0.021392822,0.0058059692,0.03010559,0.0005264282,-0.015556335,0.008003235,-0.038146973,0.064086914,-0.0051498413,0.064453125,0.05154419,0.0003168583,0.0026855469,0.014282227,-0.024612427,-0.023727417,0.060668945,0.009727478,-0.025756836,-0.00920105,-0.00034856796,-0.00049591064,-0.029006958,-0.042236328,0.020446777,-0.018539429,0.016189575,-0.032348633,-0.0044136047,-0.011260986,0.011764526,0.022903442,0.015335083,-0.005168915,0.012084961,0.025268555,0.005592346,0.027420044,-0.0017366409,0.02178955,-0.020751953,-0.027267456,0.02192688,0.0021972656,-0.0075798035,0.00522995,0.02281189,-0.0029792786,0.05331421,0.03845215,-0.029922485,0.004837036,0.030654907,0.009216309,-0.0035381317,0.054718018,0.035308838,0.01008606,0.03857422,0.032409668,0.03604126,-0.032684326,0.02330017,0.0024547577,-0.003276825,-0.006664276,-0.010971069,0.0033817291,-0.0038280487,0.0121536255,-0.0038890839,-0.022369385,0.02458191,0.023849487,-0.005970001,-0.005405426,-0.008995056,0.009979248,-0.008132935,-0.00095939636,0.013656616,-0.01828003,0.04095459,0.015640259,0.0256958,-0.01499939,0.020355225,0.005973816,-0.022125244,-0.010246277,0.01965332,-0.025146484,0.016433716,-0.0031375885,-0.0054740906,-0.057403564,0.023101807,0.023834229,-0.015457153,0.040252686,0.01121521,-0.009933472,0.008712769,0.0072402954,-0.0010623932,0.0088272095,-0.0050735474,-0.020584106,0.042053223,0.038635254,0.008621216,0.021530151,-0.020736694,-0.017913818,0.0077781677,-0.0031414032,-0.015037537,-0.007335663,-0.021560669,-0.008758545,0.017425537,0.02218628,0.032287598,0.050720215,-0.01386261,-0.012077332,0.017807007,0.033569336,0.010177612,0.0076675415,0.009361267,0.010543823,-0.022979736,0.04071045,0.051849365,0.02293396,0.04232788,-0.0036296844,0.00008261204,0.0099487305,-0.0044441223,0.025131226,-0.02848816,0.016235352,-0.0047721863,0.017410278,-0.022140503,-0.049560547,0.02331543,-0.021575928,-0.020950317,-0.018722534,0.009109497,-0.000056624413,0.038482666,0.03274536,0.015899658,-0.024856567,0.05706787,-0.011512756,0.05178833,0.009010315,-0.030288696,0.03829956,0.032409668,0.02809143,0.0060272217,0.020751953,-0.043426514,0.013725281,0.057861328,0.019424438,0.010932922,-0.0070228577,-0.0062828064,0.033996582,0.0027503967,0.020751953,-0.022277832,0.009506226,0.022705078,-0.008903503,-0.0075187683,-0.016113281,0.0012969971,0.005405426,0.06390381,-0.0134887695,-0.0069084167,-0.024108887,-0.002067566,0.022369385,-0.0036621094,0.0022354126,-0.008178711,-0.036376953,0.00969696,-0.044403076,-0.018463135,0.006088257,0.0064964294,-0.029220581,-0.020065308,0.0052337646,0.0112838745,-0.02746582,0.019714355,0.02015686,0.010795593,0.008773804,0.0423584,-0.018173218,0.023803711,-0.014579773,0.020492554,0.03717041,0.00051498413,-0.022262573,-0.006542206,0.008842468,-0.015289307,0.013183594,0.0340271,-0.008911133,0.009101868,-0.004776001,-0.012390137,0.005569458,-0.0033950806,-0.007461548,0.003900528,-0.002292633,-0.01247406,-0.0014791489,0.0010299683,-0.005458832,0.009963989,-0.023376465,-0.01638794,0.022079468,0.030944824,0.024154663,-0.033294678,-0.0029315948,0.0070762634,0.0015583038,-0.024429321,-0.02178955,-0.003446579,-0.027359009,0.013549805,0.020568848,0.013694763,0.035095215,-0.02293396,0.0030784607,0.020980835,0.0008802414,0.012252808,0.0056419373,-0.014892578,0.0002477169,-0.020568848,-0.006626129,-0.00969696,-0.0071983337,0.01373291,0.0206604,-0.013282776,-0.025375366,0.019256592,-0.012519836,0.022537231,-0.003648758,-0.012481689,0.02394104,-0.011543274,-0.010887146,0.00027132034,0.020584106,-0.014595032,-0.019424438,-0.019424438,0.02746582,0.040985107,-0.013305664,-0.008903503,0.02520752,0.010917664,0.026947021,0.053131104,0.015716553,0.038635254,0.026901245,-0.013504028,-0.015670776,0.016296387,-0.0068206787,-0.011741638,0.01914978,-0.008041382,-0.01625061,0.012397766,-0.003824234,0.00084638596,-0.021209717,-0.009460449,-0.01675415,-0.025360107,0.01737976,-0.011245728,0.01940918,-0.016799927,-0.01159668,-0.009246826,-0.02798462,-0.05545044,-0.016220093,-0.0053482056,-0.007205963,-0.05947876,-0.008148193,-0.03942871,0.019744873,-0.014503479,-0.005130768,-0.018310547,0.030761719,-0.0181427,0.002090454,0.0015535355,0.02407837,0.029403687,0.01878357,0.017150879,-0.022491455,-0.016967773,-0.024459839,0.017364502,-0.010864258,0.020767212,0.005039215,0.033233643,0.023971558,-0.003786087,0.0014715195,-0.014205933,-0.011802673,-0.011375427,-0.016296387,-0.016921997,0.014556885,0.007472992,-0.017715454,0.0052223206,0.03591919,-0.027023315,-0.0154953,0.020965576,0.045806885,0.003446579,0.033843994,-0.01914978,0.006008148,-0.013305664,-0.0043182373,-0.0107803345,0.010475159,0.008773804,0.011779785,-0.0054893494,0.004760742,0.015655518,-0.018035889,-0.008354187,0.00970459,0.00844574,-0.008552551,0.034362793,0.02192688,0.00038290024,-0.020050049,-0.014984131,0.02067566,0.044647217,0.0110321045,0.015838623,-0.011444092,0.005443573,-0.010604858,0.003534317,0.0070877075,-0.011878967,-0.03491211,-0.019088745,-0.029403687,0.020385742,-0.00447464,0.01285553,-0.0013809204,0.012168884,-0.024658203,-0.023162842,-0.010154724,0.019714355,0.009864807,-0.01360321,-0.007965088,0.0135269165,0.015075684,-0.02154541,-0.006500244,-0.038330078,-0.025253296,0.0048332214,-0.016113281,0.023040771,0.010238647,-0.002029419,-0.0040245056,-0.0023860931,-0.0076675415,-0.013763428,0.03289795,-0.0118637085,-0.00016617775,0.023269653,0.016815186,-0.029418945,0.022003174,-0.010116577,-0.0015039444,0.017623901,-0.014450073,0.018692017,-0.017654419,0.0418396,0.0019931793,-0.0030937195,0.03994751,-0.0049476624,0.010177612,-0.033477783,-0.0014429092,0.009750366,-0.009429932,0.04876709,-0.030212402,-0.021347046,0.0036449432,-0.01802063,-0.0309906,0.009162903,0.02017212,0.0362854,-0.0052948,0.044036865,-0.0070381165,-0.0035247803,0.017501831,0.010627747,-0.009170532,-0.004108429,0.02293396,0.019073486,0.0044021606,-0.0035095215,-0.010467529,-0.031066895,-0.0040512085,0.007648468,-0.0037555695,-0.006034851,0.02217102,0.012489319,0.039031982,-0.0047683716,0.0090408325,0.012084961,0.0037269592,0.03942871,0.004447937,0.05545044,-0.009605408,-0.027893066,0.003583908,-0.0029296875,-0.015205383,0.0026569366,-0.015808105,-0.01626587,-0.02973938,0.01335907,-0.0052604675,0.029846191,-0.009597778,0.009506226,-0.02720642,-0.023971558,-0.051879883,-0.022994995,-0.02911377,0.005519867,0.02734375,-0.006965637,0.02619934,0.008552551,-0.013061523,0.023712158,0.046875,-0.0061950684,-0.02619934,-0.005393982,0.006690979,-0.008728027,0.01713562,0.021133423,-0.009895325,-0.009132385,0.0003297329,-0.01826477,0.0138549805,-0.004497528,0.014724731,0.011672974,-0.0007882118,-0.0073776245,0.038238525,-0.014984131,0.0059890747,0.0105896,0.0021896362,0.045806885,0.042175293,-0.008171082,0.022888184,0.022659302,-0.04598999,0.068359375,-0.005340576,0.03778076,-0.012123108,0.017669678,-0.03982544,-0.010154724,-0.0037078857,0.0209198],"createdAt":"2026-04-21T18:32:26.420Z","updatedAt":"2026-04-22T02:32:07.019Z","lastSeenAt":"2026-04-22T02:32:07.019Z","tsv":"'/api/v1/messages/147':69,175 '/request':19,38,170 '0.02':18,37,80,169 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,119,187 'addit':218 'advertis':125 'ai':12,31,136 'ai-inference' 'analysi':140 'analyt':130 'api':5,24,45,74,100,186,206 'attach':108 'avail':233 'base':8,27,63,85 'base-network' 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':128 'classif':143 'connect':213 'content':237 'convers':160 'cost':77 'cover':10,29 'crawl':236 'data':11,30,129,133,194 'data-analytics' 'decim':91 'descript':182 'detail':220 'doc':207 'document':191,202 'embed':144 'enabl':44 'endpoint':16,35,57,67,127,163,176 'estim':154 'exampl':232 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'finance-data' 'four':126 'function':196 'gas':153 'generat':161 'geocod':158 'handl':94 'header':113 'infrastructur':156 'insight':135 'key':101 'learn':138 'limit':106 'list':71,165 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':137 'metric':131 'micropayment API' 'minim':212 'network':64 'no-api-key' 'offer':48 'openapi':224 'page':203,215 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,112,117 'per':3,22,55,81 'platform':6,25,46,124,200 'point':172 'premium':73,185 'price':147,171,204 'protocol':98 'purpos':178 'quot':152 'rate':105,150 'readm':205 'report':132 'request':56 'request/response':227 'resolv':209 'resourc':121 'return':198 'schema':228 'sentiment':139 'settl':58 'sign':116 'simpli':184 'spec':225 'specif':66,174 'subscript':103 'summar':142 'technic':219 'text':141 'token':151 'unclear':180 'unit':86 'usag':231 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,157 'utility-services' 'valid':159 'via':95 'wallet':214 'web3':146 'wider':123 'x':111 'x-payment':110 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0cfbc88f-4cb3-41e6-bc2d-7bf01b7f6047","listingId":"c7497a19-d02d-4058-adbd-9d1d3164d656","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/messages/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.420Z"}],"sources":[{"listingId":"c7497a19-d02d-4058-adbd-9d1d3164d656","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/147","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.420Z","lastSeenAt":"2026-04-22T02:32:07.019Z"}],"details":{"listingId":"c7497a19-d02d-4058-adbd-9d1d3164d656","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/147 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/147"},{"claim":"All endpoints 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/147"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) on a per-call basis","Running utility operations (geocoding, validation, conversion) with instant USDC micropayments","Integrating pay-as-you-go data analytics into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Crypto-native applications already operating on the Base network","Prototyping workflows that need diverse API capabilities without subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request pricing may not be cost-effective","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.093Z"},"updatedAt":"2026-04-22T02:32:07.019Z"}}