{"id":"d7f62dcb-6afd-4650-9b72-6ab1b02be1d9","shortId":"mEjHN5","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-enabled API endpoints accessible via per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/messages/151` is labeled \"Premium API Access\" and accepts POST requests with payment settled in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maximum amount of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe provider's landing page lists roughly 16 endpoints across four 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 are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe `/api/v1/messages/151` endpoint itself has no public documentation beyond its title. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled pages. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what it actually returns after payment is unknown. Agents should be aware that the lack of documented input/output schemas makes integration speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","micropayment"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","base usdc api","pay per call api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific purpose and response format of /api/v1/messages/151 is undocumented","Provider's /api, /pricing, and /README pages return no useful content","Cannot verify what data or service is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/151","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/151","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 402 challenge, but there is no OpenAPI spec, no documented input/output schema, no request or response examples, and the /api, /pricing, and /README pages are all blank (just 'Connect wallet'). The purpose of '/api/v1/messages/151' specifically is unclear beyond its generic title. 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":"2026-04-21T23:10:11.984Z","embedding":[-0.024963379,-0.03286743,0.055541992,0.005180359,-0.009628296,-0.024749756,-0.030166626,0.022247314,0.07110596,-0.07519531,0.02407837,-0.060638428,-0.043945312,-0.027023315,-0.014656067,0.015403748,-0.009002686,0.0059814453,-0.042236328,0.029342651,0.04727173,-0.019851685,-0.024261475,0.031829834,-0.0047035217,-0.034088135,-0.008239746,0.001115799,-0.0065994263,-0.037261963,0.04510498,-0.027618408,-0.016906738,0.003074646,-0.017089844,0.0045394897,-0.004299164,0.03753662,0.032348633,-0.019927979,-0.013504028,-0.049438477,0.018997192,-0.014129639,-0.058410645,-0.002773285,0.026733398,-0.0067634583,0.010070801,-0.0013370514,-0.040283203,0.0031795502,0.0013113022,0.013908386,0.0039901733,0.0030574799,-0.011260986,-0.0073890686,0.02368164,0.0031585693,-0.0057525635,-0.05117798,-0.018554688,-0.012199402,0.0000039339066,0.054382324,-0.007194519,0.05215454,0.0030136108,0.061523438,0.03515625,0.04727173,0.019927979,0.006313324,-0.008346558,-0.02748108,-0.016571045,0.06903076,-0.013053894,-0.027618408,-0.017211914,-0.017593384,-0.0473938,-0.005859375,-0.021652222,-0.03845215,-0.02407837,0.030929565,-0.03918457,0.024902344,-0.07800293,-0.008026123,-0.02532959,-0.009941101,0.0065193176,-0.013175964,-0.0044441223,0.02255249,0.00034737587,0.006324768,0.017303467,-0.054016113,0.0019159317,0.010696411,0.021881104,0.050354004,0.030700684,0.025283813,-0.008544922,-0.0060310364,-0.055755615,0.019241333,-0.012145996,-0.016342163,-0.0011034012,0.00048732758,-0.0064315796,0.012138367,-0.029067993,0.01108551,-0.05102539,0.04815674,0.005001068,0.006374359,0.006259918,-0.054840088,-0.006324768,0.0076828003,-0.023986816,-0.0036239624,0.010574341,0.024139404,0.038604736,-0.019012451,-0.030700684,0.010543823,-0.0121154785,-0.021255493,-0.04901123,-0.023910522,0.035980225,-0.023803711,0.008781433,0.039123535,-0.087890625,-0.012908936,-0.04534912,-0.003917694,-0.010307312,-0.02293396,-0.0031433105,0.022125244,-0.025665283,-0.016433716,-0.020492554,-0.027023315,0.005241394,0.023284912,-0.022628784,0.029174805,-0.012420654,0.01235199,0.015151978,0.001578331,0.016418457,0.028640747,0.020950317,-0.07543945,-0.07623291,-0.027496338,-0.004650116,-0.026016235,-0.02659607,-0.0030937195,-0.000047504902,-0.068359375,-0.00907135,-0.030319214,-0.0053100586,-0.04220581,0.008102417,-0.024383545,0.005214691,-0.016830444,-0.061584473,-0.024414062,-0.015541077,0.059326172,0.022079468,0.011695862,0.023742676,-0.024353027,0.06500244,0.018798828,-0.0135650635,-0.023773193,0.029724121,-0.03390503,0.03475952,-0.002691269,0.00983429,-0.027557373,0.054351807,0.06329346,0.013381958,-0.042816162,-0.0034942627,-0.04751587,-0.04067993,-0.036956787,0.031799316,0.022918701,0.006969452,0.029174805,-0.0368042,-0.04449463,-0.00667572,-0.00093984604,-0.010284424,0.05380249,0.00504303,0.005355835,0.024734497,0.0001988411,-0.0435791,0.03930664,0.038146973,0.017211914,-0.02659607,-0.022247314,0.032104492,0.0158844,-0.03390503,-0.0022678375,-0.015670776,0.040100098,-0.01878357,0.02532959,0.02381897,-0.0016641617,-0.013122559,-0.02784729,-0.00819397,0.013977051,-0.00044441223,-0.024459839,-0.04058838,-0.075927734,0.041870117,0.028335571,0.054901123,-0.0143966675,0.01096344,-0.021255493,-0.006336212,-0.062072754,0.047698975,0.053100586,-0.004890442,-0.0038986206,0.021591187,-0.010971069,-0.04321289,0.0018558502,-0.0047798157,-0.03289795,-0.011520386,0.021759033,-0.045318604,0.005203247,0.010978699,0.01158905,0.068115234,0.006866455,-0.05618286,-0.025360107,-0.0030174255,-0.0028762817,-0.017471313,0.01473999,-0.014305115,0.02230835,0.021957397,-0.0050849915,0.02470398,-0.0024585724,0.023025513,-0.004562378,-0.0048599243,-0.028778076,-0.028503418,0.0021209717,-0.0087509155,-0.080322266,0.008155823,-0.0007238388,0.064697266,-0.047790527,0.030807495,-0.0076828003,0.0071983337,0.04257202,-0.0014019012,-0.061676025,0.0063667297,0.028030396,0.023605347,0.03942871,0.014450073,-0.04989624,0.0065994263,0.07159424,-0.0184021,-0.005104065,0.0077781677,0.0045204163,0.02507019,-0.0062446594,-0.056884766,-0.03945923,-0.0034503937,-0.018661499,0.029922485,-0.018936157,-0.0022354126,-0.025558472,0.024856567,-0.01876831,0.00756073,-0.027877808,0.01260376,-0.015014648,0.012924194,-0.003332138,-0.021408081,0.014511108,-0.008476257,-0.016159058,0.010238647,0.038482666,0.025848389,-0.0048103333,-0.032226562,-0.023864746,-0.0126571655,-0.023666382,0.010421753,0.021087646,0.028900146,0.04949951,-0.028396606,0.012168884,0.02961731,0.031433105,0.028900146,-0.018966675,-0.00046658516,-0.053863525,-0.057800293,-0.033050537,-0.044189453,0.022567749,0.018997192,-0.00020468235,0.057495117,0.014930725,-0.03564453,-0.043518066,0.020385742,-0.043823242,-0.0042266846,0.033966064,-0.01159668,-0.033416748,-0.012451172,0.0013723373,-0.003293991,0.026412964,0.02494812,0.026382446,0.0657959,0.038085938,-0.008560181,0.015686035,0.0067443848,0.03237915,0.0021743774,-0.018615723,-0.024978638,-0.0069236755,0.036621094,-0.008544922,-0.03363037,-0.06036377,0.07122803,0.04550171,0.062438965,0.007621765,0.008720398,0.044525146,-0.009140015,0.0046043396,-0.030517578,-0.01134491,-0.029312134,-0.030929565,0.022109985,-0.020248413,-0.004463196,-0.02407837,0.033081055,-0.0023555756,0.015396118,-0.024353027,0.04248047,0.0009975433,0.0033988953,0.01374054,0.00016021729,0.0519104,0.06329346,-0.053771973,0.028930664,0.025985718,-0.029922485,0.014198303,0.054901123,-0.023330688,-0.016189575,-0.047973633,-0.023651123,-0.008911133,-0.019851685,-0.043182373,0.0015096664,0.010353088,0.022125244,0.04168701,-0.0046310425,-0.016540527,0.006919861,-0.011955261,-0.0703125,0.001329422,-0.035705566,0.008399963,0.035705566,-0.026809692,0.008476257,-0.018798828,-0.018188477,-0.02822876,0.0033988953,0.009780884,-0.0070762634,-0.051879883,0.053009033,0.01763916,0.022033691,0.020050049,0.027236938,0.027328491,0.027832031,0.048919678,0.008560181,-0.031433105,-0.057159424,0.0046195984,-0.0541687,0.021377563,0.022613525,-0.026443481,-0.0071868896,-0.0027370453,-0.02494812,-0.034332275,0.020523071,-0.033813477,-0.0021896362,0.022232056,-0.021087646,-0.039794922,-0.057037354,-0.014198303,-0.019104004,0.07696533,0.018737793,-0.015808105,-0.05166626,-0.0034217834,0.020355225,0.004676819,0.020431519,-0.015899658,-0.020599365,-0.01914978,-0.030685425,0.0007286072,-0.01763916,0.018234253,-0.0014371872,-0.02458191,0.017471313,-0.009086609,0.031982422,-0.0057868958,0.0049858093,0.023956299,-0.026473999,0.0058250427,-0.016708374,0.033599854,0.00062942505,-0.0143966675,-0.040771484,0.03778076,0.019622803,0.04360962,-0.029129028,-0.0010566711,-0.00026535988,0.02204895,0.022262573,-0.010826111,0.007675171,-0.018096924,-0.06726074,-0.06970215,0.033325195,-0.0110321045,0.03289795,0.028274536,0.019973755,0.02671814,-0.010124207,0.0128479,0.0090789795,-0.022399902,-0.010261536,-0.025848389,-0.031143188,-0.02319336,0.00050640106,-0.016403198,0.008621216,-0.017669678,0.0096588135,0.020263672,-0.023406982,0.014640808,0.0061798096,0.0039863586,0.029067993,0.001499176,0.026687622,0.035736084,0.0066337585,-0.045135498,0.038482666,0.012039185,0.009239197,-0.010864258,0.04788208,0.037139893,-0.010566711,-0.021148682,-0.0051231384,-0.010383606,-0.01789856,0.00051546097,0.013214111,0.013252258,-0.010307312,-0.033599854,0.016571045,0.010017395,-0.03439331,-0.023880005,0.01789856,0.022415161,-0.029129028,0.016937256,0.025222778,0.052246094,-0.028549194,-0.0029239655,-0.001042366,0.041534424,0.051879883,0.01335144,-0.011001587,0.014930725,-0.000582695,0.0132751465,-0.017532349,-0.0118637085,0.016998291,-0.0021514893,0.0178833,0.01322937,0.013442993,-0.02519226,-0.026107788,0.012390137,-0.004837036,-0.011802673,0.015716553,0.012878418,0.031082153,-0.020629883,0.019134521,0.016021729,-0.017089844,-0.022033691,-0.0072746277,0.021697998,-0.019699097,-0.015434265,0.038482666,0.025756836,0.023635864,-0.048461914,-0.00831604,0.012542725,0.007904053,-0.03125,-0.042877197,-0.046966553,0.012145996,0.02079773,0.022705078,0.029510498,0.027893066,-0.009765625,0.005657196,0.0135269165,0.0068206787,-0.011367798,-0.017822266,-0.033447266,-0.013717651,-0.0024032593,-0.0019140244,-0.045043945,0.025726318,-0.015022278,-0.02909851,0.0048828125,-0.01626587,0.0017623901,-0.022460938,0.017349243,0.03237915,0.0038318634,0.019485474,-0.01159668,-0.022705078,-0.008041382,0.016159058,0.011123657,-0.055847168,0.01966858,-0.0058898926,0.0043945312,0.0059051514,0.010322571,0.016067505,0.010314941,0.0066833496,0.0256958,-0.0368042,0.038482666,-0.025299072,0.023498535,0.0050239563,-0.038238525,-0.013153076,-0.03488159,-0.010551453,0.030807495,-0.023605347,-0.017242432,-0.034057617,-0.036712646,-0.010551453,-0.041290283,0.019683838,0.042999268,0.049438477,-0.022583008,0.0034542084,-0.00207901,-0.0022335052,-0.015258789,0.025177002,-0.008155823,0.025146484,0.025131226,0.020812988,-0.029281616,-0.029037476,-0.014442444,-0.002752304,-0.04623413,-0.050994873,-0.014862061,0.0035629272,-0.011314392,0.0010223389,-0.0184021,-0.029800415,0.0018377304,-0.042541504,0.020401001,0.006996155,0.023361206,0.002822876,-0.015609741,0.00242424,0.012992859,-0.014564514,0.03201294,0.0015134811,-0.00010943413,-0.036743164,0.0020713806,0.029754639,0.02458191,-0.0023078918,-0.011993408,-0.0050582886,-0.01864624,-0.039764404,-0.0084991455,-0.0024108887,-0.014450073,-0.010643005,0.0018949509,-0.057006836,0.0022144318,-0.028747559,0.00032782555,0.039276123,-0.00036239624,0.00032782555,-0.0035419464,0.001083374,-0.0060195923,-0.016784668,-0.03213501,0.0077705383,0.01197052,0.009284973,0.02508545,0.04196167,0.013664246,-0.008918762,0.014862061,0.0035514832,0.025054932,-0.009140015,0.01725769,-0.028518677,0.014602661,-0.011779785,-0.0037841797,-0.027557373,-0.004802704,0.085998535,0.00982666,-0.015365601,-0.01146698,-0.023117065,0.0115356445,0.027664185,-0.04449463,-0.00041627884,-0.039123535,0.02027893,-0.022033691,0.026870728,0.010192871,0.012794495,-0.014274597,-0.053497314,-0.00066900253,0.004142761,-0.00046348572,-0.0625,-0.029312134,-0.05545044,0.008560181,-0.0058670044,-0.019897461,-0.004463196,0.012260437,-0.00844574,-0.08154297,0.009017944,0.050201416,0.009941101,0.025985718,-0.011734009,0.01663208,0.019729614,-0.03289795,-0.0068740845,0.039489746,-0.026794434,-0.025009155,-0.017456055,0.032958984,-0.0023975372,-0.021469116,0.0076026917,0.004386902,0.019119263,-0.0050086975,0.015342712,-0.020080566,0.030563354,-0.027496338,0.016540527,-0.007575989,-0.011459351,0.041503906,-0.06274414,0.020050049,0.015312195,0.001709938,0.0025978088,0.02772522,0.03933716,-0.041534424,-0.011947632,0.00039601326,-0.0056037903,0.039764404,-0.01612854,0.035308838,0.0043678284,-0.01876831,0.02229309,0.0022468567,-0.018478394,-0.03778076,-0.03326416,0.029830933,0.005176544,0.004547119,-0.013023376,-0.0009589195,0.02305603,-0.008918762,0.016403198,-0.005050659,-0.030029297,-0.025360107,-0.00491333,0.006855011,0.0076560974,-0.011100769,0.021331787,0.01159668,0.031280518,-0.003194809,-0.011276245,-0.001537323,0.03765869,-0.0057411194,0.0057525635,0.022628784,-0.0068092346,0.019882202,0.020462036,0.012489319,-0.03390503,-0.0011920929,-0.027709961,-0.014099121,0.01676941,-0.006752014,-0.0036945343,0.009162903,0.003232956,-0.0033740997,-0.020019531,0.009033203,-0.026168823,-0.035949707,-0.0021629333,-0.008003235,0.018966675,0.008956909,0.0075531006,0.0071640015,-0.0072402954,0.05117798,0.0071640015,-0.017684937,0.014450073,0.025863647,0.0151901245,-0.03527832,-0.007282257,-0.0016431808,-0.007007599,0.0021839142,-0.030075073,0.023742676,0.040252686,-0.009376526,0.01789856,0.012374878,0.0206604,-0.020355225,0.00012123585,-0.0018749237,0.011306763,-0.009399414,0.025527954,-0.050231934,0.034606934,-0.0005168915,0.011833191,-0.01007843,-0.03302002,-0.030044556,0.019958496,-0.0067634583,0.000014483929,0.03894043,-0.00023949146,0.022735596,-0.021942139,-0.010787964,-0.0074920654,-0.033569336,-0.017532349,0.014671326,-0.002216339,0.0032482147,0.0067481995,-0.028030396,0.029754639,-0.040252686,0.013900757,0.009239197,-0.0020961761,-0.015014648,-0.014373779,-0.008026123,0.0011138916,-0.022232056,-0.0055351257,-0.013252258,0.053253174,0.015487671,0.04714966,0.029342651,0.015151978,-0.0074386597,-0.04864502,-0.0357666,-0.004009247,-0.01966858,0.036743164,-0.028305054,0.042053223,0.034454346,-0.014274597,0.027832031,0.037841797,0.029342651,-0.0035591125,0.02355957,-0.016418457,0.011894226,-0.0093688965,0.022750854,0.007587433,0.034423828,-0.035980225,0.023727417,0.02468872,0.021850586,-0.02293396,0.037902832,0.066101074,0.021652222,0.0072402954,0.044830322,0.0015144348,-0.021102905,0.0071983337,-0.033294678,0.04446411,0.00630188,0.05960083,0.040252686,-0.001698494,-0.01146698,0.024047852,-0.025146484,-0.036010742,0.06237793,0.03186035,-0.019760132,-0.00013661385,-0.0052986145,0.001414299,-0.026657104,-0.03250122,0.014579773,-0.018692017,0.021530151,-0.01499939,-0.0075531006,-0.002248764,0.0058670044,0.030136108,0.013023376,-0.004463196,0.01979065,0.02180481,-0.0007314682,0.024993896,0.010002136,0.018112183,-0.033050537,-0.017456055,0.02722168,0.019256592,-0.009963989,0.0005912781,0.021896362,0.016647339,0.055847168,0.04574585,-0.017913818,-0.007385254,0.038269043,0.00894165,0.0064315796,0.04916382,0.026428223,0.0058631897,0.033081055,0.036590576,0.029556274,-0.027664185,0.0129776,0.0018777847,0.0067329407,0.0003387928,-0.010505676,0.01222229,-0.0066833496,0.008506775,-0.0017023087,-0.019073486,0.020217896,0.02029419,-0.015670776,-0.014007568,0.00007098913,0.013191223,-0.010543823,-0.0072135925,0.010574341,-0.0284729,0.025299072,0.006324768,0.022140503,-0.021636963,0.01184082,-0.00283432,-0.03414917,-0.0029392242,0.027160645,-0.04736328,0.02116394,0.004081726,0.00042414665,-0.050598145,0.024505615,0.022125244,-0.0067481995,0.032592773,0.021240234,-0.010017395,0.0020122528,0.02255249,0.0039253235,0.014343262,0.0026550293,-0.022628784,0.030685425,0.037231445,0.010955811,0.01663208,-0.014656067,-0.018676758,-0.0002603531,-0.00021731853,-0.0031166077,-0.0023040771,-0.020965576,-0.013702393,0.01878357,0.02772522,0.025466919,0.027328491,-0.015838623,-0.011001587,0.021347046,0.033203125,0.004890442,0.0037727356,-0.007926941,0.019546509,-0.021774292,0.040496826,0.039276123,0.015823364,0.04248047,-0.0029792786,0.0011196136,0.008743286,-0.0029964447,0.03161621,-0.032348633,0.0053901672,-0.0017108917,0.026611328,-0.01940918,-0.038513184,0.019439697,-0.01940918,-0.019454956,-0.024429321,0.012161255,0.00073337555,0.025726318,0.03289795,0.014640808,-0.029449463,0.06573486,-0.014808655,0.047698975,-0.0069007874,-0.017990112,0.046417236,0.029174805,0.030899048,0.016448975,0.012054443,-0.03918457,0.015838623,0.04574585,0.025222778,0.010169983,-0.0020828247,-0.017211914,0.036224365,-0.0022068024,0.025848389,-0.012763977,0.005126953,0.014656067,-0.013221741,-0.014450073,0.0006132126,-0.010269165,-0.0012979507,0.059295654,-0.01209259,-0.010284424,-0.01878357,-0.013710022,0.019500732,-0.0010375977,0.0063095093,0.00027489662,-0.026046753,0.018112183,-0.029785156,-0.010444641,0.020767212,0.013626099,-0.043914795,-0.021255493,0.018844604,0.009643555,-0.03616333,0.028335571,0.02330017,0.0076065063,0.005508423,0.04598999,-0.009384155,0.020599365,-0.018859863,0.025222778,0.040496826,-0.0055656433,-0.021026611,0.0026779175,0.012001038,-0.00932312,0.019165039,0.026321411,-0.0058288574,0.010604858,0.004463196,-0.0158844,0.00333786,-0.0040626526,-0.016540527,-0.00034332275,-0.019470215,-0.012786865,0.006149292,0.008926392,0.0012216568,0.017028809,-0.009002686,-0.015472412,0.014846802,0.040252686,0.013496399,-0.025619507,-0.008041382,0.0096206665,-0.0073432922,-0.03161621,-0.026550293,0.0035419464,-0.032196045,0.0020141602,0.021270752,0.018859863,0.034179688,-0.021911621,0.005378723,0.03604126,0.0019741058,0.022277832,0.0024433136,-0.013000488,0.011192322,-0.02229309,-0.0000014305115,-0.016845703,-0.0062713623,0.018356323,0.020767212,-0.007007599,-0.03111267,0.027297974,-0.007396698,0.021057129,-0.010299683,-0.008972168,0.017578125,-0.0005054474,-0.008293152,-0.008171082,0.03640747,-0.013244629,-0.013938904,-0.020385742,0.03378296,0.044708252,-0.018417358,-0.017181396,0.022628784,0.022354126,0.020141602,0.04989624,0.016082764,0.04550171,0.018234253,-0.01725769,-0.011421204,0.02822876,-0.008850098,-0.015991211,0.014793396,-0.0058937073,-0.017715454,0.009941101,0.012268066,-0.0051116943,-0.03286743,-0.020492554,-0.020965576,-0.030685425,0.017669678,0.0010843277,0.012268066,-0.024749756,-0.0012226105,0.0036888123,-0.031311035,-0.043151855,-0.012001038,-0.006095886,-0.015777588,-0.058410645,0.019134521,-0.026107788,0.017166138,-0.015342712,0.0005502701,-0.015716553,0.029785156,-0.0084991455,-0.00080156326,0.00573349,0.015396118,0.043304443,0.0037155151,0.019714355,-0.0231781,-0.016052246,-0.022628784,0.018127441,-0.01399231,0.022277832,0.0006866455,0.030899048,0.02142334,-0.0057258606,0.010353088,-0.020980835,-0.0055732727,-0.018325806,-0.021331787,-0.021118164,0.021835327,0.011360168,-0.013412476,-0.007499695,0.03656006,-0.017288208,-0.015930176,0.024902344,0.044128418,-0.0007982254,0.023483276,-0.014602661,-0.00048017502,-0.02041626,0.0021572113,-0.009552002,0.0084991455,0.012168884,0.0031204224,-0.010971069,-0.005126953,0.023971558,-0.01737976,-0.0022449493,0.017227173,0.007835388,-0.0060653687,0.027572632,0.028198242,-0.000052690506,-0.014427185,-0.019241333,0.018844604,0.046691895,0.008033752,0.0107040405,-0.0016813278,0.018417358,-0.015670776,0.0073547363,0.009124756,-0.02243042,-0.033416748,-0.020492554,-0.025650024,0.0413208,-0.008163452,0.010383606,-0.010826111,0.0115737915,-0.015068054,-0.03656006,-0.021652222,0.016281128,0.020050049,-0.012161255,-0.007820129,0.0033988953,0.009780884,-0.025604248,-0.007709503,-0.03930664,-0.03793335,-0.008956909,-0.026046753,0.021148682,0.017333984,-0.0093688965,-0.008522034,0.005645752,0.0060577393,-0.0043525696,0.020233154,-0.004524231,-0.010284424,0.022003174,0.017456055,-0.022079468,0.013946533,-0.02192688,-0.008018494,0.017181396,-0.010765076,0.014129639,-0.032104492,0.041381836,-0.0018358231,-0.003850937,0.028579712,0.0042762756,0.019012451,-0.03302002,-0.0016889572,0.0067481995,-0.020751953,0.0463562,-0.018997192,-0.019317627,0.0013017654,-0.00554657,-0.02861023,0.009094238,0.023742676,0.03366089,0.0007843971,0.043060303,-0.020492554,-0.005882263,0.00869751,0.009468079,-0.015258789,0.001958847,0.033355713,0.009559631,0.005580902,-0.0028591156,-0.008453369,-0.034179688,-0.00095796585,0.015022278,0.0037727356,-0.015609741,0.031066895,0.010574341,0.042938232,-0.0048103333,0.0140686035,0.013313293,0.00063085556,0.037628174,-0.00434494,0.045196533,0.0023174286,-0.029830933,-0.0018377304,0.010223389,-0.023452759,0.0064926147,-0.014945984,0.00030517578,-0.041534424,0.017700195,-0.0129852295,0.024032593,-0.0056419373,0.018707275,-0.026504517,-0.010948181,-0.050323486,-0.012611389,-0.046539307,0.0063323975,0.031219482,0.0069732666,0.030593872,0.0040740967,-0.023269653,0.02809143,0.047332764,-0.004737854,-0.026046753,-0.015808105,0.015571594,0.002910614,0.015541077,0.012084961,-0.015541077,-0.014389038,-0.008804321,-0.019378662,0.0109939575,-0.010299683,0.020126343,0.012023926,-0.008354187,-0.0068092346,0.031433105,-0.008407593,0.01411438,0.012741089,0.0006146431,0.03152466,0.03237915,-0.010269165,0.022888184,0.019546509,-0.053527832,0.06732178,-0.005001068,0.03466797,-0.010765076,0.016494751,-0.043548584,-0.023651123,-0.016433716,0.013496399],"createdAt":"2026-04-21T18:32:26.341Z","updatedAt":"2026-04-22T02:32:06.835Z","lastSeenAt":"2026-04-22T02:32:06.835Z","tsv":"'/api/v1/messages/151':62,168 '/request':18,36 '0.02':17,35,101,153 '000':91 '0x8335':78 '16':111 '20':90 '2913':79 '402':203 '6':96 'accept':69 'access':47,67 'across':113 'actual':209 'advertis':85 'agent':215 'ai':12,30,123 'amount':88 'analysi':127 'analyt':117 'api':5,23,45,66,158 'avail':190 'awar':218 'base':8,26,56,81,92 'base usdc api' 'beyond':175 'call':4,22 'categori':115 'challeng':84,205 'classif':130 'collect':40 'commit':166 'confirm':198 'contract':77 'convers':147 'cover':10,28 'crawl':193 'data':11,29,116,120 'decim':97 'document':174,223 'embed':131 'enabl':44 'endpoint':46,60,112,169,196 'equal':100 'estim':141 'exampl':189 'exchang':136 'export':121 'feed':135 'financ':13,31,132 'four':114 'gas':140 'generat':148 'geocod':145 'host':38 'infrastructur':143 'input/output':224 'insight':122 'integr':227 'key':159 'label':64 'lack':221 'land':107 'learn':125 'limit':162 'list':109 'live':199 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':124 'make':226 'maximum':87 'metric':118 'micropay':53 'micropayment' 'micropayment api' 'minimum':165 'network':57 'openapi':181 'page':108,194 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':73,212 'per':3,21,50,102,154 'per-request':49 'post':70 'post-endpoint' 'premium':65 'price':134,151 'provid':105 'public':173 'quot':139 'rate':137,161 'report':119 'request':51,71,103,155 'request/response':184 'return':200,210 'rough':110 'schema':185,225 'sentiment':126 'settl':74 'spec':182 'specif':59 'specul':228 'suit':6,24 'summar':129 'text':128 'titl':177 'token':138 'unit':93 'unknown':214 'usag':188 'usdc':9,27,52,76,99 'usdc-base' 'util':15,33,144 'valid':146,202 'via':48 'web3':133 'x402':43,83,204 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b963a157-5bb9-4503-b09f-89d0becf5d17","listingId":"d7f62dcb-6afd-4650-9b72-6ab1b02be1d9","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/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.341Z"}],"sources":[{"listingId":"d7f62dcb-6afd-4650-9b72-6ab1b02be1d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/151","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.341Z","lastSeenAt":"2026-04-22T02:32:06.835Z"}],"details":{"listingId":"d7f62dcb-6afd-4650-9b72-6ab1b02be1d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/151 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/151"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/151"},{"claim":"The provider lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API content via USDC micropayments without API key registration","Agent-driven pay-per-call workflows on the Base network","Exploring x402 protocol integrations with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-request API access on Base","Low-cost micropayment API consumption"],"notFor":["Production use requiring documented request/response schemas","Use cases needing guaranteed SLAs or support contracts","Users without Base network USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.231Z"},"updatedAt":"2026-04-22T02:32:06.835Z"}}