{"id":"bbe52513-111c-4a2f-880d-ab3030f0e700","shortId":"pnQNLC","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/146` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or upfront commitments are required — each request is individually settled on-chain.\n\nThe broader platform advertises multiple API categories including 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\nHowever, the specific functionality behind the `/api/v1/payments/146` endpoint is not documented beyond its \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a valid x402 402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","on-chain-settlement"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no content","The specific functionality of /api/v1/payments/146 is completely undocumented","No OpenAPI schema or request/response examples provided","Cannot verify what data or service is delivered after successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/146","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/payments/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The 'Premium API Access' label is generic and uninformative.","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":"2026-04-19T06:36:39.085Z","embedding":[-0.018310547,-0.031982422,0.03918457,0.013908386,0.010406494,-0.02909851,-0.028762817,0.027297974,0.07269287,-0.07800293,0.023742676,-0.045318604,-0.031463623,-0.03427124,-0.03253174,0.0058250427,-0.011833191,0.010406494,-0.041992188,0.029205322,0.022384644,-0.016342163,-0.026763916,0.031707764,0.0010662079,-0.022277832,-0.008338928,-0.021850586,-0.021087646,-0.03857422,0.05319214,-0.030303955,-0.015571594,0.010375977,-0.01675415,-0.020736694,-0.005012512,0.026977539,0.031311035,-0.0064048767,-0.005783081,-0.05984497,0.0059661865,-0.011146545,-0.051605225,-0.0010843277,-0.006122589,-0.02243042,0.002506256,0.0010967255,-0.033996582,-0.0049324036,-0.012672424,0.009002686,0.011688232,0.013427734,-0.0138168335,-0.009811401,0.016311646,0.008590698,-0.00680542,-0.061553955,-0.024124146,-0.012786865,-0.0009160042,0.057159424,-0.0112838745,0.042541504,0.0045318604,0.06274414,0.03967285,0.052825928,0.026931763,0.013648987,-0.0038776398,-0.0067214966,0.010864258,0.067871094,-0.01259613,-0.015258789,-0.004184723,-0.012329102,-0.058929443,0.0012187958,-0.015548706,-0.03869629,-0.023513794,0.019989014,-0.01247406,0.03543091,-0.0690918,-0.0112838745,-0.009315491,0.0052948,0.00932312,-0.009170532,-0.016311646,0.03161621,-0.003824234,0.0154418945,0.00087451935,-0.049835205,0.022262573,0.007980347,0.03778076,0.049682617,0.021392822,0.026016235,0.009361267,-0.009735107,-0.043670654,0.0126571655,-0.0119018555,-0.015151978,0.017852783,0.021484375,-0.012435913,0.015090942,-0.036193848,0.01309967,-0.046417236,0.049621582,0.014198303,-0.006011963,0.0036716461,-0.04269409,-0.023849487,0.022384644,-0.018341064,-0.010612488,0.001042366,0.012428284,0.025360107,-0.018310547,-0.03543091,0.022735596,-0.019256592,-0.01713562,-0.044525146,-0.028366089,0.04071045,-0.025817871,0.023757935,0.041625977,-0.103149414,-0.0055503845,-0.04837036,0.004146576,-0.043670654,-0.010353088,-0.009918213,0.032714844,-0.010726929,-0.011489868,-0.027008057,-0.020812988,0.0032577515,0.03475952,-0.0181427,0.047180176,-0.017364502,0.030914307,0.021408081,0.0041770935,0.0154800415,0.023498535,0.005214691,-0.08123779,-0.088012695,-0.021057129,-0.009628296,-0.013847351,-0.03286743,0.011550903,-0.016616821,-0.07659912,-0.00680542,-0.016403198,-0.004497528,-0.03778076,-0.0023422241,-0.025024414,0.01537323,-0.005710602,-0.06341553,-0.022842407,-0.022247314,0.066223145,0.028137207,0.022338867,0.02784729,-0.019866943,0.060516357,0.027038574,-0.026428223,-0.021697998,0.023132324,-0.017288208,0.00944519,-0.01184845,0.008888245,-0.037139893,0.046783447,0.06298828,0.0074653625,-0.012176514,-0.021865845,-0.062561035,-0.03717041,-0.035705566,0.019439697,0.009788513,-0.0060195923,0.041534424,-0.042114258,-0.03250122,0.004173279,0.009048462,0.018295288,0.061187744,0.010879517,-0.010047913,0.021453857,0.024765015,-0.05392456,0.031829834,0.036102295,0.014907837,-0.02897644,-0.021957397,0.031707764,0.04901123,-0.029129028,0.02532959,-0.019638062,0.02722168,-0.01210022,-0.001657486,0.016693115,-0.0134887695,-0.021743774,-0.025466919,-0.02835083,0.028686523,0.009651184,-0.027450562,-0.02784729,-0.08306885,0.042541504,0.039245605,0.041015625,-0.0051002502,0.0014533997,-0.019683838,-0.020126343,-0.070739746,0.052215576,0.07702637,-0.004135132,-0.0071792603,0.018615723,-0.011398315,-0.0287323,0.0045776367,-0.008476257,-0.03427124,-0.023651123,0.016586304,-0.042785645,0.0055618286,0.021591187,0.030258179,0.050689697,-0.010406494,-0.04647827,-0.017852783,-0.0040359497,-0.012611389,-0.027252197,-0.006843567,-0.013191223,0.005970001,0.015670776,0.003112793,0.014312744,0.0015459061,-0.0015697479,-0.0026016235,0.0001244545,-0.018478394,-0.027374268,0.010269165,0.0014228821,-0.06097412,0.0064582825,-0.0030918121,0.07330322,-0.038909912,0.037597656,-0.007572174,0.010192871,0.053466797,-0.0017147064,-0.044311523,0.019607544,0.0340271,0.012550354,0.03982544,0.014198303,-0.031463623,-0.017700195,0.0748291,-0.017364502,-0.0037002563,0.0137786865,0.007965088,0.029052734,-0.0019168854,-0.06561279,-0.03869629,0.0031719208,-0.029266357,0.013999939,-0.025299072,0.020980835,-0.013923645,0.0035915375,-0.02960205,0.00021791458,-0.03149414,0.018478394,-0.012588501,0.0041923523,-0.011962891,-0.02168274,0.021270752,0.015792847,-0.011192322,0.004966736,0.032592773,0.024169922,-0.0044021606,-0.026321411,-0.029281616,-0.008644104,-0.005214691,0.022521973,0.01889038,0.029632568,0.0435791,-0.027252197,0.0063552856,0.024795532,0.030731201,0.03149414,-0.0039100647,0.007411957,-0.07104492,-0.05380249,-0.029464722,-0.037231445,0.03488159,0.00026893616,-0.01071167,0.056793213,0.011314392,-0.02758789,-0.042297363,0.018707275,-0.053863525,0.002878189,0.03942871,-0.011703491,-0.02810669,0.005794525,-0.013885498,0.007572174,0.03881836,0.020629883,0.033721924,0.06604004,0.043273926,0.00059986115,0.013198853,0.0006699562,0.03286743,0.0095825195,-0.027252197,-0.027954102,-0.010696411,0.03778076,-0.021362305,-0.021148682,-0.06866455,0.050811768,0.041748047,0.08581543,0.015235901,0.0045433044,0.03829956,-0.018341064,0.022003174,-0.021377563,-0.01625061,-0.021469116,-0.0463562,0.02722168,-0.019607544,0.0054016113,-0.021743774,0.04034424,-0.00642395,0.020645142,-0.028869629,0.05407715,-0.0056152344,-0.008079529,0.00674057,0.018417358,0.049987793,0.06451416,-0.04827881,0.017715454,0.014930725,-0.04031372,0.009346008,0.04324341,-0.0105896,-0.012069702,-0.05227661,-0.02545166,-0.01133728,-0.0014219284,-0.051818848,0.00504303,0.014221191,0.016860962,0.02293396,-0.019165039,-0.0105896,-0.012619019,-0.017669678,-0.057678223,0.009124756,-0.039398193,-0.003824234,0.03967285,-0.032409668,-0.014183044,0.0010089874,-0.0025978088,-0.00043296814,0.023025513,0.032165527,-0.00013041496,-0.04071045,0.023254395,0.011276245,0.0047798157,0.009841919,0.030548096,0.013702393,0.030563354,0.05706787,0.018478394,-0.017364502,-0.06274414,0.023788452,-0.046325684,0.003572464,0.022094727,-0.02330017,-0.00020241737,-0.017303467,-0.033569336,-0.031402588,0.009262085,-0.0357666,0.0014572144,0.022720337,-0.008911133,-0.023422241,-0.06591797,-0.018066406,0.005947113,0.06222534,0.014854431,0.005180359,-0.05316162,-0.00026655197,0.019454956,0.01084137,0.03277588,-0.014472961,-0.010276794,-0.02229309,-0.035064697,-0.017929077,-0.03137207,0.018707275,-0.002210617,-0.01663208,0.022399902,0.011306763,0.02432251,0.0049438477,0.013504028,0.023849487,-0.028656006,-0.0022583008,-0.0072364807,0.04385376,0.0017995834,-0.012901306,-0.04171753,0.03668213,0.011512756,0.030197144,-0.045043945,-0.006832123,-0.012962341,0.008575439,0.017501831,-0.011604309,-0.0118637085,-0.016906738,-0.04815674,-0.06530762,0.040252686,-0.017974854,0.02331543,0.022476196,0.007171631,0.019165039,-0.0010786057,-0.0013551712,0.015182495,-0.021453857,-0.004337311,-0.019638062,-0.030807495,-0.01663208,-0.012336731,-0.017349243,0.023208618,-0.015777588,0.02999878,0.008216858,-0.017974854,0.027709961,0.005191803,-0.011367798,0.014144897,0.008659363,0.027038574,0.039794922,0.008453369,-0.04309082,0.014175415,0.0055770874,0.008071899,-0.0058631897,0.045074463,0.028793335,-0.008964539,-0.0010204315,-0.011512756,-0.020843506,-0.018997192,0.0007224083,0.0017538071,0.01524353,-0.0009379387,-0.05267334,0.009613037,0.014892578,-0.03668213,-0.019592285,0.014854431,0.008415222,-0.03540039,0.016921997,0.034820557,0.055236816,-0.027923584,-0.00010353327,0.01322937,0.022705078,0.0231781,0.011421204,-0.008590698,0.014160156,-0.0151901245,0.012939453,-0.0030765533,-0.0055274963,0.021606445,0.0033359528,0.023544312,0.019180298,0.009902954,-0.016830444,-0.029891968,-0.00019645691,-0.016296387,-0.025604248,0.023223877,0.015975952,0.021987915,-0.021972656,0.020523071,0.013572693,-0.0211792,-0.014762878,-0.00920105,0.038879395,-0.027404785,-0.014640808,0.01348114,0.015625,0.04006958,-0.055786133,-0.004371643,0.0043754578,0.012611389,-0.029937744,-0.0385437,-0.041992188,0.009994507,0.037200928,0.011367798,0.017456055,0.038391113,0.0010414124,0.010353088,0.0317688,0.0046920776,-0.01687622,-0.010406494,-0.042114258,-0.020828247,-0.0058174133,-0.0038146973,-0.03515625,0.012359619,-0.0095825195,-0.029968262,0.008926392,-0.006023407,-0.0049743652,-0.0075912476,0.009643555,0.04208374,-0.0010604858,0.017700195,-0.014213562,-0.03111267,-0.0017061234,0.005832672,0.01701355,-0.0418396,0.011276245,-0.010566711,-0.011100769,0.003452301,0.004737854,0.020370483,0.02810669,0.007972717,0.02986145,-0.048339844,0.055603027,-0.04321289,0.014213562,0.0065231323,-0.031951904,-0.001958847,-0.025878906,-0.020263672,0.046020508,-0.031402588,-0.0037136078,-0.03125,-0.029464722,-0.008224487,-0.05142212,0.013519287,0.037994385,0.034851074,-0.023117065,-0.0010604858,-0.003452301,0.0024814606,-0.013847351,0.0107803345,-0.01586914,0.021728516,0.02658081,0.0034999847,-0.03479004,-0.029449463,-0.026473999,0.0021533966,-0.049102783,-0.050842285,-0.01259613,0.0043525696,-0.0071792603,-0.02267456,-0.03277588,-0.031066895,-0.002040863,-0.038146973,0.0012950897,0.006954193,0.016220093,-0.0032920837,-0.021255493,-0.0044555664,0.013847351,-0.012390137,0.041778564,0.010559082,0.0013198853,-0.0357666,0.014343262,0.014457703,0.012245178,-0.0013551712,-0.007987976,-0.013069153,-0.02293396,-0.052581787,-0.008506775,-0.006832123,-0.018630981,-0.0067329407,-0.0013017654,-0.054138184,-0.0074005127,-0.01751709,0.010147095,0.020385742,0.014091492,0.0129852295,-0.004295349,0.016403198,0.000582695,-0.011657715,-0.032684326,0.025497437,0.01083374,0.0008530617,0.02798462,0.039916992,0.011741638,-0.027145386,0.015129089,0.008033752,0.024887085,-0.013305664,0.010276794,-0.016677856,0.016067505,-0.0069885254,-0.02229309,-0.033050537,-0.008628845,0.08795166,0.004146576,-0.01676941,-0.009353638,-0.01626587,0.021743774,0.03274536,-0.035095215,-0.0031871796,-0.023483276,0.017410278,-0.029571533,0.006111145,0.011238098,0.021835327,-0.013572693,-0.05319214,-0.014511108,-0.0008611679,-0.018066406,-0.058258057,-0.023254395,-0.06390381,-0.0012273788,-0.0055503845,-0.018707275,-0.0065727234,0.008285522,-0.0115737915,-0.08251953,0.0022640228,0.042510986,0.012039185,0.01953125,-0.002380371,0.022079468,0.024154663,-0.03656006,-0.0059547424,0.030471802,-0.031463623,-0.020477295,-0.019180298,0.013900757,-0.019180298,-0.011009216,0.0059127808,0.0061454773,0.019073486,-0.012313843,0.0012254715,-0.00856781,0.021408081,-0.028869629,0.016113281,-0.010795593,-0.010406494,0.0357666,-0.052856445,0.026626587,0.013114929,-0.0049972534,0.0072746277,0.029083252,0.041625977,-0.037902832,-0.015586853,0.01878357,0.013793945,0.035064697,-0.022598267,0.046051025,0.011299133,-0.024536133,0.016525269,-0.003921509,-0.021484375,-0.039642334,-0.021942139,0.014038086,-0.0012741089,0.009010315,-0.017105103,0.013038635,0.017181396,-0.008262634,0.01348114,-0.004272461,-0.02722168,-0.02229309,-0.0012283325,-0.0034065247,-0.0018844604,-0.009361267,0.026611328,0.01852417,0.0368042,0.023284912,-0.008026123,0.00466156,0.031143188,-0.009162903,0.0029659271,0.023529053,0.0030822754,0.015853882,0.022476196,0.012008667,-0.0440979,-0.012786865,-0.028839111,-0.022735596,-0.0032806396,-0.008666992,-0.02116394,-0.016540527,0.0093307495,-0.0045051575,-0.029785156,0.006580353,-0.024124146,-0.029922485,-0.005504608,-0.0073890686,0.02444458,-0.0001360178,0.009719849,0.004787445,0.0011453629,0.046966553,-0.004711151,-0.018447876,0.028244019,0.03753662,0.012504578,-0.03010559,-0.0042304993,-0.012878418,-0.007583618,0.0055732727,-0.042541504,0.017303467,0.0446167,-0.01977539,0.005645752,0.004360199,0.030807495,-0.0038280487,0.0049552917,-0.009933472,0.013633728,-0.010261536,0.04434204,-0.044403076,0.0236969,0.0056381226,0.006259918,-0.0104599,-0.010620117,-0.030197144,0.010681152,0.003255844,-0.0127334595,0.05166626,0.0035820007,0.029464722,-0.0154800415,-0.023742676,0.009994507,-0.030883789,-0.017700195,0.026382446,-0.0069503784,-0.0011663437,0.012290955,-0.02053833,0.04083252,-0.033935547,0.023605347,0.0030269623,-0.006664276,-0.00052404404,-0.023361206,-0.019073486,-0.0061073303,-0.018478394,0.007583618,0.0068626404,0.045562744,0.023010254,0.031143188,0.054901123,0.011787415,-0.0039367676,-0.03744507,-0.031143188,0.006072998,-0.01637268,0.02078247,-0.012931824,0.054870605,0.03427124,-0.0028839111,0.038513184,0.030258179,0.036102295,0.002040863,0.010543823,-0.014823914,0.013504028,0.0011844635,0.038909912,-0.0027198792,0.040618896,-0.0340271,0.029174805,0.0211792,0.027297974,-0.036621094,0.031707764,0.06866455,0.019165039,-0.00894165,0.04144287,-0.007545471,-0.0031814575,-0.016677856,-0.024490356,0.06021118,0.006187439,0.05105591,0.052978516,0.018539429,-0.0009355545,0.010177612,-0.024932861,-0.027816772,0.06335449,0.019012451,-0.01777649,-0.013465881,-0.0018596649,0.0063171387,-0.045166016,-0.0309906,0.028945923,-0.014343262,0.007575989,-0.017700195,-0.0061073303,-0.00957489,-0.00023126602,0.025894165,0.010673523,-0.01966858,0.02897644,0.034332275,0.002462387,0.02331543,-0.00058078766,0.029830933,-0.02067566,-0.03314209,0.007926941,0.017364502,-0.010787964,-0.008979797,0.022750854,0.0027236938,0.041778564,0.042755127,-0.018859863,0.008842468,0.038879395,0.013397217,-0.009437561,0.052124023,0.038513184,0.01789856,0.045898438,0.024856567,0.040740967,-0.03878784,0.018569946,0.0009965897,0.0026073456,-0.011192322,-0.011520386,0.0014133453,-0.015975952,0.016479492,-0.0028629303,-0.0146865845,0.019180298,0.026153564,-0.0087509155,-0.007801056,-0.003540039,0.013076782,-0.015640259,-0.00434494,0.009468079,-0.013633728,0.03491211,0.017608643,0.024108887,-0.02217102,0.020996094,0.0006508827,-0.013542175,0.00065279007,0.019638062,-0.028900146,0.011558533,-0.009841919,0.0076828003,-0.046417236,0.012374878,0.029464722,-0.008850098,0.02784729,0.015258789,-0.0010108948,-0.0054740906,0.019485474,0.0060195923,0.0016126633,-0.009384155,-0.027160645,0.033172607,0.046722412,0.00043344498,0.003458023,-0.02079773,-0.009971619,0.010543823,-0.009857178,-0.005996704,-0.001663208,-0.017227173,-0.029815674,0.012954712,0.03552246,0.018554688,0.054901123,-0.016967773,-0.009757996,0.012779236,0.034942627,0.0028629303,0.00274086,-0.0040664673,0.014915466,-0.014892578,0.054138184,0.0385437,0.01309967,0.037200928,-0.010406494,-0.014251709,0.0036144257,-0.0077400208,0.021820068,-0.018051147,0.0046920776,0.002937317,0.029830933,-0.01713562,-0.041992188,0.013259888,-0.014122009,-0.02067566,-0.02330017,0.012481689,0.0024318695,0.03137207,0.04260254,0.020828247,-0.025634766,0.05935669,-0.011070251,0.05340576,-0.002292633,-0.016830444,0.041870117,0.026748657,0.030731201,0.021652222,0.01713562,-0.030471802,0.018539429,0.03387451,0.02758789,0.012992859,0.0026741028,-0.009475708,0.03353882,0.0064811707,0.026535034,-0.012588501,0.005794525,0.008522034,-0.0007481575,-0.012649536,-0.0065841675,-0.009933472,0.009254456,0.04724121,-0.031707764,-0.012954712,-0.027664185,-0.008422852,0.032196045,-0.020355225,0.00082302094,-0.0051574707,-0.02305603,0.01626587,-0.025405884,-0.023025513,0.003042221,0.024353027,-0.036834717,-0.007801056,0.00029182434,0.015716553,-0.02633667,0.029464722,0.023666382,0.0004711151,0.011367798,0.048553467,-0.011512756,0.034484863,-0.0073623657,0.027297974,0.032348633,0.0068130493,-0.022262573,-0.007965088,0.01008606,-0.011138916,0.01259613,0.036315918,-0.016143799,0.0033340454,-0.004283905,-0.011161804,-0.0017538071,0.0075263977,-0.006816864,-0.0015830994,-0.013961792,-0.008979797,-0.0017290115,0.0064926147,-0.00207901,0.00079107285,-0.0047798157,-0.013442993,0.016159058,0.03302002,0.016494751,-0.045684814,-0.0067443848,0.009170532,0.012512207,-0.020263672,-0.01940918,-0.0045051575,-0.03250122,0.019454956,0.016738892,0.017852783,0.018157959,-0.034240723,0.005760193,0.014892578,0.013221741,0.015640259,0.009765625,-0.012016296,0.009628296,-0.017471313,-0.0031337738,-0.0067253113,-0.0043907166,0.0126571655,0.020828247,-0.0051345825,-0.029052734,0.019256592,-0.005466461,0.019012451,0.0011234283,-0.017822266,0.023025513,-0.011802673,-0.003314972,0.0037174225,0.015007019,-0.014381409,-0.015235901,-0.013053894,0.038879395,0.052246094,-0.009132385,-0.013122559,0.020355225,0.013168335,0.020507812,0.04031372,0.0061683655,0.045318604,0.02835083,-0.015403748,-0.021652222,0.027267456,-0.01676941,-0.025131226,0.016952515,-0.016311646,-0.0129852295,0.0178833,0.007835388,-0.000030994415,-0.026428223,-0.012748718,-0.007881165,-0.015609741,0.017089844,-0.019577026,0.017578125,-0.026290894,-0.013168335,-0.0009059906,-0.023025513,-0.046783447,-0.021774292,-0.0090408325,-0.013313293,-0.0574646,0.010406494,-0.03353882,0.010269165,-0.026763916,-0.0070152283,-0.012023926,0.01651001,-0.01335144,-0.0042495728,0.0048942566,0.027664185,0.026855469,0.012008667,0.023422241,-0.030258179,-0.01776123,-0.030471802,0.008712769,-0.01802063,0.018432617,0.0071105957,0.03274536,0.026306152,-0.0076675415,-0.0005760193,-0.010818481,-0.0044517517,-0.01890564,-0.0234375,-0.023376465,0.026626587,0.013626099,-0.0107803345,-0.011100769,0.041900635,-0.026397705,-0.016586304,0.029922485,0.042785645,0.005302429,0.031951904,-0.023361206,-0.006511688,-0.0079193115,-0.00070858,-0.015609741,0.01423645,0.012527466,0.0140686035,-0.0013475418,0.010902405,0.023040771,-0.014877319,-0.0041160583,0.028366089,0.003288269,-0.0128479,0.042175293,0.013870239,0.008529663,-0.0036373138,-0.016113281,0.015182495,0.047668457,0.008178711,0.008171082,0.0015764236,0.0023155212,-0.015296936,0.006538391,0.008384705,-0.014328003,-0.03994751,-0.0121154785,-0.027160645,0.017547607,0.0000036358833,0.009788513,-0.009262085,0.014823914,-0.020507812,-0.02394104,-0.022766113,0.027069092,0.01146698,-0.009651184,-0.016677856,0.014312744,0.021957397,-0.031173706,0.0023975372,-0.043670654,-0.03466797,0.005027771,-0.030258179,0.026367188,0.0137786865,-0.0047073364,0.0051193237,-0.0068969727,-0.0034313202,-0.011528015,0.023330688,-0.013328552,-0.0051193237,0.034423828,0.013198853,-0.022109985,0.01852417,-0.01259613,-0.0023975372,0.023834229,-0.008987427,0.010871887,-0.022598267,0.036315918,-0.012710571,-0.0056152344,0.03942871,-0.010154724,0.009681702,-0.03656006,0.0029468536,0.002008438,-0.000934124,0.041625977,-0.03237915,-0.024887085,0.006175995,-0.029556274,-0.026306152,0.0028381348,0.01838684,0.03894043,-0.0129776,0.04473877,-0.015701294,-0.008926392,0.018203735,0.010818481,-0.015090942,0.0005917549,0.027069092,0.0068626404,-0.008110046,-0.0055274963,-0.014328003,-0.02798462,-0.010810852,0.02003479,-0.004989624,-0.009765625,0.022445679,0.0071983337,0.04171753,0.002998352,0.013648987,0.013259888,0.00894165,0.029373169,0.0030403137,0.050750732,-0.009407043,-0.03225708,0.0035095215,0.008476257,-0.022003174,0.0005683899,-0.0077209473,-0.00048184395,-0.03540039,0.015914917,-0.01007843,0.03074646,-0.024307251,0.011909485,-0.023834229,-0.005722046,-0.043914795,-0.012794495,-0.020828247,0.007133484,0.029525757,0.0039253235,0.022399902,0.0039138794,-0.01576233,0.023544312,0.04876709,-0.010856628,-0.021148682,-0.013244629,0.0015964508,0.0025558472,0.010292053,0.010826111,-0.021270752,-0.009429932,0.0028057098,-0.02810669,0.0054855347,-0.008621216,0.015426636,0.0074653625,-0.0044174194,-0.009384155,0.030807495,-0.006416321,-0.010620117,0.008804321,0.006916046,0.04421997,0.029449463,-0.010620117,0.015914917,0.021072388,-0.04031372,0.054534912,0.0056877136,0.02357483,-0.0178833,0.0024147034,-0.036071777,-0.022598267,-0.014823914,0.0010309219],"createdAt":"2026-04-18T18:49:32.921Z","updatedAt":"2026-04-23T17:31:47.633Z","lastSeenAt":"2026-04-23T17:31:47.633Z","tsv":"'/api/v1/payments/146':61,162 '/request':13,30,153 '0.02':12,29,78,152 '000':72 '20':71 '402':209 '6':82 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,171 'actual':217 'addit':198 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,15,22,32,42,65,87,109,170,187 'base':8,25,55,73 'behind':160 'beyond':167 'broader':105 'call':4,21,85 'categori':110 'chain':103 'challeng':210 'charg':68 'classif':126 'commit':93 'confirm':203 'connect':193 'content':199 'convers':143 'crawl':183 'crypto-paid API' 'data':112,116,213 'decim':83 'doc':184 'document':166 'embed':127 'endpoint':59,146,163,201 'estim':137 'exampl':180 'exchang':132 'export':117 'feed':131 'financ':128 'function':159 'gas':136 'generat':144 'geocod':141 'given':79 'howev':156 'i.e':77 'includ':111 'individu':99 'infrastructur':139 'insight':118 'key':16,33,88 'label':63,172 'learn':121 'limit':90 'list':148 'live':204 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'metric':114 'multipl':108 'network':56 'no-api-key' 'on-chain':101 'on-chain-settlement' 'openapi':176 'page':188 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,221 'per':3,20,40,84 'platform':6,23,43,106 'point':155 'premium':64,169 'premium API access' 'price':130,154,185 'prompt':195 'protocol':48 'quot':135 'rate':89,133 'report':115 'request':41,97 'request/response':179 'requir':17,34,95 'return':190,205,218 'schema':177 'sentiment':122 'servic':215 'settl':100 'specif':58,158 'success':220 'summar':125 'text':124 'token':134 'unit':74 'unknown':223 'upfront':92 'upon':219 'usdc':9,26,51,76,80 'usdc-base' 'use':45 'util':140 'valid':142,207 'via':10,27 'wallet':194 'web3':129 'x402':11,28,47,208 'x402 API' 'x402-payment'","prices":[{"id":"25def18f-e0c4-45f6-ba65-7186070dfb6d","listingId":"bbe52513-111c-4a2f-880d-ab3030f0e700","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/payments/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:32.921Z"}],"sources":[{"listingId":"bbe52513-111c-4a2f-880d-ab3030f0e700","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:32.921Z","lastSeenAt":"2026-04-23T17:31:47.633Z"}],"details":{"listingId":"bbe52513-111c-4a2f-880d-ab3030f0e700","quickStartSnippet":"# The endpoint returns HTTP 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/146 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with accepts[].maxAmountRequired = 20000 (USDC, 6 decimals = $0.02)\n# Attach a valid X-PAYMENT header to complete the transaction.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/146"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/146"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating on-chain USDC micropayments into agent workflows","Accessing various utility, AI, or data endpoints with instant crypto settlement"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","Use cases requiring on-chain payment receipts for each API call","Low-volume or sporadic API consumers who want to avoid subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.526Z"},"updatedAt":"2026-04-23T17:31:47.633Z"}}