{"id":"f574d370-f976-4985-8929-c658cbb689cf","shortId":"u5HnkW","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transactions/217` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with a 300-second timeout. The platform advertises additional 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 (geocoding, validation, conversion, generation).\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what input the POST body expects or what the response payload contains.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","pay-per-use","post-endpoint"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/transactions/217 is unclear; 'Premium API Access' is a generic label","No request body schema or response schema documented anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/217","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/transactions/217","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific '/transactions/217' endpoint is unclear beyond the generic 'Premium API Access' label.","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":"2026-04-19T12:35:00.228Z","embedding":[-0.03579712,-0.033996582,0.03955078,0.016662598,0.011947632,-0.029373169,-0.019577026,0.023147583,0.07446289,-0.06762695,0.024978638,-0.04824829,-0.036315918,-0.032562256,-0.019256592,0.012840271,-0.0069618225,0.0064201355,-0.040985107,0.031021118,0.03427124,-0.023269653,-0.027130127,0.022476196,-0.012374878,-0.010910034,-0.009735107,-0.0031375885,-0.0234375,-0.039916992,0.046142578,-0.02758789,-0.012390137,0.008277893,-0.009498596,-0.005580902,0.007511139,0.03201294,0.026763916,-0.0044898987,-0.001950264,-0.066467285,0.011398315,-0.0137786865,-0.058380127,-0.0027484894,0.010261536,-0.021255493,0.013076782,-0.0066375732,-0.04284668,-0.008270264,0.0019111633,0.0065574646,0.004207611,0.012901306,-0.0015506744,-0.008796692,0.011184692,0.01737976,-0.01474762,-0.05657959,-0.014221191,-0.008323669,-0.0043525696,0.049621582,-0.0028057098,0.040405273,0.011779785,0.060272217,0.03060913,0.048706055,0.029907227,0.019821167,0.004802704,-0.007408142,-0.013496399,0.060333252,-0.017684937,-0.029647827,-0.006866455,-0.011238098,-0.062683105,-0.006679535,-0.018310547,-0.045806885,-0.02456665,0.020309448,-0.027542114,0.021408081,-0.07354736,0.00070762634,-0.003458023,-0.0011959076,0.0032691956,-0.0068855286,-0.012825012,0.019607544,-0.00730896,0.014503479,0.00705719,-0.044006348,0.023925781,0.0040283203,0.034820557,0.03930664,0.017196655,0.026397705,0.0070114136,-0.004333496,-0.025863647,0.015838623,-0.0060195923,-0.017822266,0.017288208,0.0016775131,-0.005542755,0.015731812,-0.022521973,0.015235901,-0.048187256,0.052612305,0.0047569275,0.007095337,0.0009417534,-0.047454834,-0.010284424,0.019119263,-0.036010742,0.0046653748,0.020217896,0.016906738,0.019805908,-0.018585205,-0.023208618,0.011726379,-0.031463623,-0.011238098,-0.042297363,-0.034362793,0.045013428,-0.027359009,0.017837524,0.04397583,-0.105407715,-0.017700195,-0.047454834,0.010398865,-0.0236969,-0.017868042,0.011291504,0.018875122,-0.019943237,-0.023040771,-0.018325806,-0.032684326,-0.005744934,0.047790527,-0.01675415,0.03668213,-0.018554688,0.024230957,0.016159058,0.015068054,0.0104904175,0.020202637,0.003900528,-0.076538086,-0.08074951,-0.015808105,0.012268066,-0.028961182,-0.03186035,0.00030207634,-0.012031555,-0.07623291,-0.013267517,-0.024520874,-0.0076446533,-0.048858643,-0.0027503967,-0.02696228,0.018737793,-0.010597229,-0.058166504,-0.02810669,-0.030044556,0.05847168,0.031143188,0.022399902,0.014984131,-0.011726379,0.05532837,0.03237915,-0.007457733,-0.016540527,0.016296387,-0.03225708,0.030014038,-0.0019350052,0.019195557,-0.030914307,0.022857666,0.074279785,0.0074768066,-0.038360596,-0.010383606,-0.05807495,-0.05114746,-0.026611328,0.019714355,0.009048462,-0.0046081543,0.026351929,-0.030532837,-0.031066895,0.008628845,0.017547607,0.011985779,0.059509277,0.011161804,-0.010932922,0.02998352,0.016921997,-0.036834717,0.04437256,0.0368042,0.009498596,-0.014579773,-0.044525146,0.026428223,0.038269043,-0.026168823,0.019836426,-0.010787964,0.02468872,-0.0024547577,0.003955841,0.0184021,-0.00655365,-0.019638062,-0.023071289,-0.019134521,0.026168823,0.019088745,-0.02720642,-0.035125732,-0.08465576,0.043945312,0.034820557,0.039978027,0.0021419525,0.00434494,-0.0143966675,-0.00907135,-0.06976318,0.05758667,0.06854248,-0.0045814514,-0.012321472,0.025604248,-0.0072631836,-0.039520264,0.003194809,-0.020721436,-0.029571533,-0.021240234,0.015640259,-0.044433594,-0.0023117065,0.020401001,0.017288208,0.049041748,-0.008163452,-0.044921875,-0.030548096,-0.0069351196,0.0068893433,-0.026641846,-0.0010881424,-0.0059432983,0.022964478,0.011894226,0.00699234,0.014259338,-0.002281189,0.0000410676,-0.008285522,0.010391235,-0.018218994,-0.03286743,0.01725769,-0.0006966591,-0.0513916,-0.0018501282,0.00018298626,0.07684326,-0.053588867,0.040283203,-0.015731812,0.0047683716,0.048919678,-0.011894226,-0.056365967,0.0077171326,0.022781372,0.019927979,0.045684814,0.019744873,-0.024917603,-0.019180298,0.07751465,-0.0104599,-0.0032653809,0.019577026,0.01386261,0.038146973,-0.0110321045,-0.06604004,-0.04031372,-0.0033493042,-0.029464722,0.025817871,-0.014526367,0.03378296,-0.02003479,0.006717682,-0.025466919,-0.006866455,-0.030426025,0.00434494,-0.015327454,0.0119018555,-0.03366089,-0.025665283,0.019546509,0.0021400452,-0.01007843,0.010238647,0.048797607,0.022247314,-0.01108551,-0.032043457,-0.029678345,-0.012390137,-0.006385803,0.014579773,0.018356323,0.020690918,0.053100586,-0.03753662,-0.0040893555,0.02720642,0.016952515,0.039154053,-0.0026607513,-0.0020046234,-0.068481445,-0.055755615,-0.025360107,-0.040374756,0.028442383,0.016418457,-0.006954193,0.060180664,0.009414673,-0.0090789795,-0.033691406,0.018218994,-0.038482666,-0.00390625,0.043395996,-0.021026611,-0.027999878,0.011764526,0.00046420097,0.0038223267,0.028671265,0.024719238,0.033447266,0.070617676,0.039611816,0.0024852753,0.026992798,0.004875183,0.027389526,0.0030155182,-0.022735596,-0.030426025,-0.02458191,0.031311035,-0.0184021,-0.014389038,-0.06274414,0.06665039,0.036010742,0.098083496,0.01966858,0.007511139,0.026809692,-0.010116577,0.00995636,-0.017227173,-0.02746582,-0.025619507,-0.046569824,0.02949524,-0.020263672,-0.013191223,-0.016342163,0.028823853,-0.0047721863,0.015060425,-0.033172607,0.04534912,-0.017440796,-0.018600464,0.02355957,0.009437561,0.05822754,0.062408447,-0.042755127,0.027328491,0.023040771,-0.03060913,0.011886597,0.040618896,-0.015029907,-0.00970459,-0.044555664,-0.019317627,-0.009468079,-0.013900757,-0.03866577,0.0025157928,0.012825012,0.017425537,0.027130127,-0.002571106,-0.016906738,-0.00014722347,-0.02104187,-0.049591064,0.0008878708,-0.039093018,0.005382538,0.04257202,-0.022064209,0.0009522438,-0.002155304,-0.0073547363,-0.000092089176,0.009460449,0.021759033,-0.003080368,-0.046203613,0.037963867,-0.0030994415,0.012786865,0.003786087,0.026046753,0.02494812,0.024307251,0.038024902,0.014427185,-0.0137786865,-0.066467285,0.022903442,-0.048034668,0.008705139,0.02796936,-0.027664185,-0.0058937073,-0.0085372925,-0.030090332,-0.023666382,0.0065727234,-0.015472412,-0.001701355,0.02444458,-0.01977539,-0.025527954,-0.05178833,-0.016159058,-0.010826111,0.057647705,0.026138306,0.0064582825,-0.06341553,-0.0018672943,0.031951904,0.0023937225,0.028442383,-0.014053345,-0.0011711121,-0.019134521,-0.036102295,-0.011199951,-0.022369385,0.027297974,-0.00831604,0.0022697449,0.023483276,0.0069084167,0.021484375,0.0048599243,0.0041007996,0.02331543,-0.026535034,-0.012542725,-0.0098724365,0.035827637,0.020095825,-0.011108398,-0.049438477,0.038970947,0.007972717,0.036865234,-0.041809082,-0.0073623657,-0.00712204,0.012840271,0.010047913,-0.00724411,-0.0012464523,-0.0072250366,-0.045928955,-0.06689453,0.04324341,-0.020599365,0.02722168,0.02532959,0.008041382,0.02784729,-0.014656067,-0.0011548996,0.01725769,-0.025131226,-0.011077881,-0.024673462,-0.033813477,-0.019439697,-0.012069702,-0.02671814,0.021148682,-0.014541626,0.0129470825,-0.0022697449,-0.018753052,0.027297974,0.0046691895,-0.00031232834,0.012588501,0.0010375977,0.021697998,0.03173828,0.016555786,-0.04876709,0.02355957,0.0032138824,0.0022125244,-0.012565613,0.048980713,0.024795532,-0.0028152466,-0.011276245,-0.015342712,-0.019989014,-0.023925781,0.0039596558,0.0053634644,0.010169983,-0.0024719238,-0.042175293,0.021011353,-0.00415802,-0.038726807,-0.031951904,0.017913818,0.0140686035,-0.036132812,0.02178955,0.02949524,0.05807495,-0.018096924,0.0073547363,0.004009247,0.03503418,0.03451538,0.0154953,-0.0030212402,0.025909424,-0.008522034,0.017990112,-0.011398315,-0.016952515,0.017150879,0.00012528896,0.023498535,0.020050049,0.0015716553,-0.013999939,-0.03173828,0.0015144348,-0.022476196,-0.023971558,0.020370483,0.01890564,0.032684326,-0.026397705,0.021362305,0.017181396,-0.019241333,-0.018341064,-0.005607605,0.035308838,-0.0055503845,-0.005897522,0.0053901672,0.014518738,0.027542114,-0.06378174,-0.0042495728,0.012489319,0.009613037,-0.01576233,-0.0513916,-0.039489746,0.0005803108,0.04119873,0.008911133,0.024230957,0.031036377,0.007045746,0.00655365,0.029083252,-0.005645752,-0.016647339,-0.014930725,-0.04446411,-0.025253296,-0.001364708,0.0017757416,-0.0362854,0.019973755,-0.004650116,-0.029907227,0.008872986,-0.02709961,0.00049495697,-0.014724731,0.015457153,0.038970947,0.005771637,0.015144348,-0.0132751465,-0.032989502,-0.006286621,0.01360321,0.013648987,-0.047058105,0.021896362,-0.013153076,-0.009002686,0.0031147003,0.00818634,0.02482605,0.024612427,0.014183044,0.032806396,-0.040130615,0.049560547,-0.02758789,0.013069153,0.0012550354,-0.033081055,-0.0124435425,-0.020431519,-0.017410278,0.0473938,-0.028701782,-0.00982666,-0.031036377,-0.040252686,-0.012992859,-0.052856445,0.013114929,0.036102295,0.03930664,-0.024383545,0.0012178421,-0.0016498566,0.005874634,-0.011062622,0.008895874,-0.023468018,0.035461426,0.025970459,0.0004427433,-0.027130127,-0.02331543,-0.023071289,-0.010131836,-0.046295166,-0.05041504,-0.002565384,0.006160736,-0.008056641,-0.00969696,-0.033203125,-0.033996582,-0.0009379387,-0.04611206,0.013404846,0.00207901,0.02003479,-0.002216339,-0.025039673,-0.005115509,0.017456055,-0.010421753,0.029006958,0.005962372,-0.006980896,-0.044433594,0.01574707,0.019607544,0.02758789,-0.0019741058,-0.02772522,-0.0039024353,-0.015548706,-0.05630493,-0.0055389404,-0.00894928,-0.017547607,-0.012191772,0.0034236908,-0.052520752,-0.0030899048,-0.026733398,-0.00001579523,0.016830444,0.012504578,0.00869751,-0.0014514923,0.015083313,0.0018997192,-0.009498596,-0.032318115,0.014015198,0.0102005005,0.0003209114,0.025726318,0.06048584,-0.0025806427,-0.024887085,0.0018177032,-0.0005059242,0.013031006,-0.021560669,0.008720398,-0.020523071,0.0071792603,-0.014770508,-0.008262634,-0.038208008,0.0015153885,0.08428955,0.0039024353,-0.01133728,-0.019958496,-0.020996094,0.026535034,0.032165527,-0.03552246,-0.0024223328,-0.031341553,0.020217896,-0.025894165,0.013641357,0.0037517548,0.024993896,-0.023223877,-0.054656982,-0.01448822,-0.0087890625,-0.0059318542,-0.072631836,-0.030914307,-0.07489014,0.008041382,-0.01461792,-0.026611328,0.004173279,0.009262085,-0.01878357,-0.081604004,-0.0051231384,0.04776001,0.0090408325,0.029342651,-0.01335907,0.019851685,0.028793335,-0.030136108,0.0050582886,0.026245117,-0.025527954,-0.013305664,-0.024871826,0.023773193,-0.016525269,-0.010169983,0.0017337799,0.006259918,0.015510559,-0.0020694733,0.013626099,-0.0132369995,0.021591187,-0.012580872,0.01260376,-0.014595032,-0.010284424,0.04107666,-0.053833008,0.02758789,0.015235901,-0.008178711,0.011138916,0.039520264,0.03894043,-0.038269043,-0.016326904,0.013832092,0.009887695,0.035095215,-0.020584106,0.048339844,0.0088272095,-0.010932922,0.018936157,-0.015357971,-0.008621216,-0.022369385,-0.025634766,0.017303467,0.006298065,0.0029525757,-0.019226074,-0.001917839,0.016159058,0.0035877228,0.013023376,-0.011924744,-0.016113281,-0.024917603,0.005832672,0.0039482117,0.0033493042,-0.0055351257,0.026641846,0.030685425,0.035461426,0.009002686,-0.016662598,0.0048561096,0.03265381,-0.011108398,-0.0043945312,0.028305054,0.0077819824,0.016937256,0.017318726,0.017562866,-0.045715332,-0.019607544,-0.021392822,-0.018569946,0.0011253357,-0.0065994263,-0.010597229,0.00032782555,0.0033550262,-0.010269165,-0.023712158,0.0011835098,-0.023712158,-0.037384033,-0.008972168,-0.011604309,0.02796936,0.0107803345,0.0146102905,0.003358841,-0.008056641,0.037017822,0.0037975311,-0.016525269,0.038330078,0.029052734,0.020202637,-0.030883789,-0.0048942566,-0.014411926,-0.0071792603,0.00040769577,-0.027664185,0.012962341,0.035705566,-0.018417358,0.0045661926,0.007522583,0.025985718,-0.0077209473,0.0026741028,-0.008613586,0.019195557,-0.011131287,0.03692627,-0.05307007,0.02720642,0.019607544,-0.0043258667,-0.01574707,-0.013153076,-0.027389526,0.023132324,0.005630493,-0.010536194,0.05441284,0.008468628,0.026031494,-0.020248413,-0.01876831,0.0028038025,-0.029296875,-0.025375366,0.013572693,-0.012710571,0.0015697479,0.01638794,-0.02557373,0.027389526,-0.03265381,0.016830444,0.0025787354,0.0082092285,-0.00995636,-0.01360321,-0.0006146431,-0.019958496,-0.01348114,0.00007992983,-0.006839752,0.053771973,0.013641357,0.03704834,0.043121338,0.019729614,0.001461029,-0.040496826,-0.024765015,0.0076789856,-0.0146865845,0.01751709,-0.017959595,0.059265137,0.03326416,0.00002849102,0.045928955,0.038970947,0.0463562,0.003332138,0.014091492,-0.014167786,0.016998291,-0.0102005005,0.022079468,-0.0067100525,0.028289795,-0.032165527,0.029449463,0.01398468,0.027664185,-0.022705078,0.039123535,0.07244873,0.020767212,-0.022750854,0.048797607,-0.0035095215,-0.009536743,-0.007156372,-0.020095825,0.047607422,0.0061187744,0.042633057,0.049438477,0.010009766,-0.0013790131,0.019515991,-0.026870728,-0.019042969,0.06463623,0.029708862,-0.015106201,-0.008407593,-0.0028572083,0.006454468,-0.044921875,-0.023086548,0.020126343,-0.020980835,0.003145218,-0.003107071,-0.008049011,-0.016494751,0.0055618286,0.014022827,0.01360321,-0.015563965,0.01940918,0.030090332,0.00012755394,0.026046753,0.0005197525,0.021316528,-0.021728516,-0.027877808,0.02381897,0.027511597,-0.0071411133,-0.016021729,0.024337769,0.004371643,0.036499023,0.040008545,-0.01965332,0.006160736,0.02532959,0.013381958,-0.00057792664,0.057434082,0.036254883,0.0116119385,0.040374756,0.032989502,0.03387451,-0.04345703,0.027175903,0.0032901764,0.0050086975,-0.020050049,-0.004585266,0.0031986237,-0.009994507,0.028381348,-0.004047394,-0.016983032,0.023956299,0.027740479,-0.0066337585,-0.011352539,-0.012390137,0.01260376,-0.027023315,-0.0101623535,0.011924744,-0.019699097,0.033233643,0.007820129,0.019744873,-0.025634766,0.0262146,-0.00017857552,-0.0127334595,-0.0043144226,0.031097412,-0.043792725,0.0051651,-0.0042266846,0.0015039444,-0.05178833,0.008514404,0.021606445,-0.006290436,0.021560669,0.01386261,0.0018062592,-0.0008211136,0.030395508,0.01461792,-0.0007739067,-0.013549805,-0.018341064,0.022354126,0.038726807,0.00021398067,0.00024843216,-0.026870728,-0.003932953,0.011169434,-0.012809753,-0.00491333,-0.0070114136,-0.020828247,-0.020370483,0.02230835,0.03564453,0.01637268,0.053466797,-0.020889282,-0.014595032,0.013923645,0.034057617,-0.0018692017,-0.0055732727,-0.0015039444,0.016235352,-0.022491455,0.04776001,0.035980225,0.010032654,0.04119873,0.000500679,-0.019927979,0.009101868,-0.0132751465,0.0309906,-0.014877319,0.0005803108,0.0018291473,0.034179688,-0.008079529,-0.03112793,-0.0013437271,-0.020477295,-0.02960205,-0.017333984,0.015838623,0.0021533966,0.027130127,0.04031372,0.027328491,-0.017242432,0.0602417,-0.010528564,0.045318604,-0.00023305416,-0.014427185,0.053619385,0.019821167,0.04071045,0.015899658,0.008132935,-0.0368042,0.024780273,0.030288696,0.021942139,0.010696411,0.0043945312,-0.009460449,0.03314209,-0.00070238113,0.032470703,-0.0013656616,-0.0019626617,0.017745972,-0.0064315796,-0.021316528,-0.0061798096,-0.004600525,0.0073165894,0.048187256,-0.027618408,-0.0096588135,-0.027618408,-0.011009216,0.025436401,-0.013122559,0.000069618225,0.001124382,-0.015945435,0.0146865845,-0.017791748,-0.022064209,0.010528564,0.030838013,-0.05709839,-0.014015198,0.008712769,0.016784668,-0.020126343,0.038085938,0.02418518,-0.0021972656,0.006263733,0.04638672,-0.01260376,0.026550293,-0.012321472,0.03363037,0.02671814,0.005126953,-0.0206604,-0.00051498413,0.0042648315,-0.0072517395,0.01638794,0.03137207,-0.010406494,-0.000004172325,-0.005016327,-0.008125305,-0.0024299622,0.002840042,-0.011558533,0.009315491,-0.0077552795,-0.013175964,0.011177063,0.011657715,-0.0072135925,0.010971069,0.0026550293,-0.017105103,0.0067863464,0.03616333,0.020858765,-0.03817749,0.00033044815,0.00020289421,0.004081726,-0.021987915,-0.012306213,0.00021791458,-0.03930664,0.009483337,0.015419006,0.014389038,0.0093307495,-0.021911621,-0.00040841103,0.027633667,0.00737381,0.018295288,0.0055732727,-0.0012750626,0.013442993,-0.011550903,-0.002506256,-0.0036735535,-0.01348114,0.018615723,0.0184021,0.0018825531,-0.031204224,0.024719238,-0.0028476715,0.02281189,0.0017213821,-0.0068893433,0.017211914,-0.009918213,0.003929138,-0.00012683868,0.016220093,-0.017578125,-0.00983429,-0.005558014,0.032928467,0.054260254,-0.009063721,-0.0057525635,0.023208618,0.022033691,0.014335632,0.038146973,0.0057640076,0.044799805,0.025009155,-0.017990112,-0.018615723,0.020065308,-0.016448975,-0.03186035,0.016098022,-0.010734558,-0.011856079,0.018585205,0.016326904,0.0071487427,-0.037078857,-0.009742737,-0.013771057,-0.014221191,0.01725769,-0.010566711,0.02053833,-0.02470398,-0.010093689,0.011138916,-0.030456543,-0.043182373,-0.021072388,-0.003004074,-0.015686035,-0.051452637,0.0063667297,-0.022140503,0.0036125183,-0.02357483,0.0008196831,-0.008300781,0.019256592,-0.008293152,-0.008415222,0.0024433136,0.025222778,0.026367188,0.0012769699,0.021881104,-0.032196045,-0.017074585,-0.02784729,0.002243042,-0.0119018555,0.023025513,0.0049476624,0.03274536,0.023239136,-0.021331787,-0.000030517578,-0.0151901245,-0.0035171509,-0.017059326,-0.013702393,-0.020874023,0.026641846,0.014297485,-0.012176514,-0.008720398,0.03930664,-0.03250122,-0.009498596,0.034851074,0.03866577,0.007965088,0.033813477,-0.018493652,0.00012373924,-0.020507812,0.00957489,-0.012451172,0.0041999817,0.0025348663,0.009971619,-0.0043907166,0.009216309,0.021469116,-0.01171875,0.0058898926,0.03265381,0.008651733,-0.0017614365,0.03265381,0.0051231384,0.015899658,-0.015777588,-0.004776001,0.023147583,0.050598145,0.005252838,0.009117126,-0.0132369995,0.007850647,-0.017166138,0.012680054,0.018661499,-0.024841309,-0.052124023,-0.018829346,-0.03427124,0.025802612,-0.0019388199,0.00020289421,-0.015045166,0.014442444,-0.019378662,-0.03375244,-0.024673462,0.034301758,0.013168335,-0.018569946,-0.013435364,0.0070648193,0.01374054,-0.034332275,-0.0000949502,-0.04626465,-0.041259766,-0.008071899,-0.023544312,0.027557373,0.0054855347,-0.00819397,-0.0082092285,-0.010772705,0.00031495094,0.002565384,0.024459839,-0.008956909,-0.010665894,0.023025513,0.022949219,-0.018676758,0.029968262,-0.0132369995,0.002248764,0.014465332,-0.013908386,0.017730713,-0.020767212,0.025177002,-0.009162903,-0.0028514862,0.032196045,-0.009017944,0.022979736,-0.0362854,0.0025424957,-0.007221222,-0.01335907,0.03414917,-0.024017334,-0.021026611,0.008529663,-0.015510559,-0.026641846,0.0023441315,0.01361084,0.026504517,-0.0046424866,0.045928955,-0.010032654,-0.013977051,0.018096924,0.014152527,-0.014274597,0.003868103,0.031433105,-0.00061035156,-0.0009217262,-0.005340576,-0.013198853,-0.021331787,-0.0068206787,0.01928711,-0.0033073425,-0.013442993,0.02848816,0.018081665,0.04321289,-0.0063667297,0.023208618,0.01739502,0.006427765,0.029647827,0.006111145,0.04711914,-0.0025558472,-0.031951904,0.0029525757,0.0054244995,-0.029342651,0.011558533,-0.005001068,-0.0011472702,-0.042816162,0.009506226,0.0010251999,0.028152466,-0.016983032,0.019744873,-0.020233154,-0.0039596558,-0.035095215,0.00015985966,-0.03930664,0.011398315,0.037475586,0.0033187866,0.030136108,0.00023651123,-0.032836914,0.018722534,0.047943115,-0.00030446053,-0.02229309,-0.01876831,0.010421753,0.00080633163,0.015357971,0.003189087,-0.016235352,-0.01828003,-0.00035452843,-0.019424438,0.005432129,-0.009941101,0.018234253,0.009994507,-0.0018262863,-0.0090408325,0.026138306,-0.004814148,-0.0040626526,0.007709503,0.0051727295,0.03262329,0.029525757,-0.014785767,0.021713257,0.021438599,-0.042266846,0.06640625,-0.00014269352,0.026473999,-0.017150879,0.003993988,-0.03463745,-0.029129028,-0.023910522,-0.0055999756],"createdAt":"2026-04-18T18:59:16.266Z","updatedAt":"2026-04-22T13:31:47.444Z","lastSeenAt":"2026-04-22T13:31:47.444Z","tsv":"'/api':179 '/api/v1/transactions/217':92 '/docs':178 '/pricing':180 '/readme':182 '/request':13,28 '0.02':12,27,74,119 '000':108 '0x8335':113 '20':107 '2913':114 '300':130 '402':102 'Base network API' 'USDC micropayment API' 'access':98 'across':138 'addit':136 'advertis':135 'ai':148 'ai/ml':49 'analysi':152 'analyt':48,142 'api':5,20,37,79,97 'avail':209 'base':8,23,67,109,116 'bodi':231 'broad':42 'call':4,19,76 'catalog':43 'categori':140 'challeng':103,220 'classif':155 'commit':86 'connect':188 'contain':238 'convers':171 'crypto-paid API' 'data':47,52,141,145 'detail':195 'document':173,204,223 'embed':156 'enabl':36 'endpoint':45,57,90,137,211 'equal':118 'estim':166 'exact':126 'exampl':207 'exchang':161 'expect':232 'export':146 'extrem':175 'feed':160 'financ':157 'finance/web3':51 'flat':71 'four':139 'gas':165 'generat':172 'geocod':169 'infer':50 'infrastructur':168 'input':228 'insight':147 'key':80 'learn':150 'limit':83 'list':94 'live':213 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':149 'made':122 'metric':143 'network':9,24,68 'no-api-key' 'offer':40 'openapi':199 'page':183 'paid':59 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-use' 'payload':208,237 'payment':120 'per':3,18,61,75 'per-request':60 'per-request-billing' 'platform':6,21,38,134 'post':230 'post-endpoint' 'premium':96 'price':159 'prompt':190 'quot':164 'rate':72,82,162 'render':185 'report':144 'request':62,104 'request/response':202 'requir':87 'respond':215 'respons':236 'return':100 'schema':203 'scheme':127 'second':131 'sentiment':151 'servic':55 'span':46 'spars':176 'spec':200 'specif':89 'summar':154 'technic':194 'text':153 'timeout':132 'token':163 'unclear':226 'unit':110 'usdc':15,30,64,112 'usdc-base' 'use':63 'util':54 'valid':170,218 'via':10,25,123 'wallet':189 'web3':158 'without':222 'x402':11,26,35,125,219 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"298b85ad-746f-4aef-a7e3-c591505670ce","listingId":"f574d370-f976-4985-8929-c658cbb689cf","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/transactions/217","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:16.266Z"}],"sources":[{"listingId":"f574d370-f976-4985-8929-c658cbb689cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/217","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:16.266Z","lastSeenAt":"2026-04-22T13:31:47.444Z"}],"details":{"listingId":"f574d370-f976-4985-8929-c658cbb689cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/217 \\\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 platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/217"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without signing up for an account or managing API keys","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payments"],"bestFor":["Developers who want zero-friction, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.703Z"},"updatedAt":"2026-04-22T13:31:47.444Z"}}