{"id":"5ee566ae-d94f-4396-b7fb-2566bccc16e1","shortId":"JWFHvd","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site offers a broad catalog of pay-per-call APIs spanning 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 priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/apikeys/49` is listed as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind this particular endpoint path (`/apikeys/49`) is unclear; it may provision or retrieve an API key, but this is speculative. Users should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","api-key-management","data-analytics","ai-inference","finance-data","web3-data","geocoding","utility-services"],"categories":["api-marketplace","crypto","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content.","No OpenAPI or schema definition found for any endpoint.","The specific functionality of /api/v1/apikeys/49 ('Premium API Access') is unclear — it may provision API keys or serve as a generic premium endpoint, but this is unconfirmed.","The broader catalog of endpoints (AI, analytics, finance, utils) listed on the homepage could not be individually verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/49","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/apikeys/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/apikeys/49 is ambiguous. 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":"2026-04-19T15:15:18.410Z","embedding":[-0.014045715,-0.022094727,0.044830322,0.01322937,0.021713257,-0.047668457,-0.031707764,0.058685303,0.057373047,-0.07165527,0.028717041,-0.04623413,-0.027069092,-0.041290283,-0.034851074,0.015548706,-0.02772522,0.011306763,-0.053741455,0.035949707,0.043792725,-0.02166748,-0.009597778,0.044555664,0.0005431175,-0.021240234,-0.0154800415,-0.019058228,0.00044751167,-0.04434204,0.036468506,-0.025375366,-0.004562378,0.030075073,-0.023239136,-0.021972656,0.0009675026,0.035308838,0.038970947,-0.013916016,-0.0032196045,-0.07312012,-0.008270264,0.018295288,-0.039093018,0.00062417984,-0.007972717,-0.025817871,-0.006385803,-0.0037174225,-0.030334473,-0.0044441223,-0.026870728,-0.0047340393,0.0090789795,0.016479492,-0.025909424,-0.030517578,0.0098724365,0.0071029663,0.01625061,-0.047454834,-0.011909485,0.015533447,0.015106201,0.053527832,0.006362915,0.055664062,0.01701355,0.03945923,0.055664062,0.053253174,0.011299133,0.01802063,0.0009636879,0.0022773743,-0.011138916,0.078552246,-0.0058784485,-0.010169983,-0.014526367,-0.0026779175,-0.029006958,-0.006755829,-0.024795532,-0.059265137,-0.014152527,0.0011949539,-0.008850098,0.027023315,-0.07598877,-0.021957397,-0.009094238,0.01878357,0.011291504,0.009468079,-0.026351929,0.026245117,-0.019104004,0.022018433,0.011856079,-0.032440186,0.008453369,0.017623901,0.054504395,0.04498291,0.014175415,0.02835083,-0.006965637,-0.027542114,-0.043640137,0.0032596588,-0.023666382,-0.023361206,0.014579773,0.010116577,-0.014266968,0.0027217865,-0.020874023,0.0063972473,-0.05984497,0.044067383,0.03781128,-0.022277832,0.01235199,-0.06021118,-0.006286621,0.0046577454,-0.025482178,-0.016830444,0.017440796,0.016143799,0.034301758,-0.01373291,-0.029296875,0.0011520386,-0.008239746,-0.027359009,-0.042663574,-0.024383545,0.023712158,-0.0262146,0.042175293,0.033325195,-0.09716797,-0.021743774,-0.05706787,0.0023937225,-0.03527832,-0.011077881,0.007774353,0.0072517395,-0.026565552,-0.0067367554,-0.006931305,-0.014701843,-0.006629944,0.03277588,-0.016067505,0.029525757,-0.0061531067,0.051757812,-0.0014858246,0.006958008,0.033996582,0.046020508,0.006099701,-0.075805664,-0.08746338,-0.041992188,-0.011741638,-0.025970459,-0.030960083,0.011566162,-0.012550354,-0.06427002,-0.023025513,-0.009674072,-0.0143585205,-0.041137695,-0.016998291,-0.013328552,0.0031585693,0.00010788441,-0.051483154,-0.0051994324,-0.026016235,0.06591797,0.008811951,0.007217407,0.0390625,-0.012886047,0.043792725,0.009239197,-0.015022278,-0.04248047,0.010986328,-0.022369385,0.035186768,0.023803711,-0.009864807,-0.037200928,0.03326416,0.062194824,0.031433105,-0.014213562,0.010154724,-0.043792725,-0.030395508,-0.02305603,-0.0031147003,0.0038375854,0.008918762,0.0368042,-0.044128418,-0.030075073,-0.0038414001,0.00014686584,0.0143585205,0.07244873,-0.00945282,-0.012161255,0.007663727,0.021499634,-0.027709961,0.041748047,0.039367676,0.023010254,-0.027709961,-0.010192871,0.012771606,0.02973938,-0.040985107,0.00472641,-0.025375366,0.026794434,0.0025405884,0.017593384,0.026168823,-0.019897461,-0.009147644,-0.030334473,-0.009880066,0.040008545,0.0050315857,-0.018417358,-0.048034668,-0.07019043,0.029266357,0.023422241,0.041900635,-0.008644104,0.012329102,-0.021484375,0.0017414093,-0.054840088,0.045898438,0.08117676,-0.029190063,-0.009231567,0.011947632,-0.019210815,-0.03125,-0.019332886,0.00868988,-0.02583313,-0.012802124,0.013153076,-0.038635254,-0.0071029663,0.011558533,0.026229858,0.055145264,-0.016998291,-0.024002075,-0.031143188,0.01121521,0.005847931,-0.04425049,-0.006996155,0.00013506413,0.005619049,0.046722412,-0.018539429,0.04095459,-0.001080513,0.019699097,0.0006890297,-0.028717041,-0.03842163,-0.01966858,0.02078247,0.012817383,-0.05596924,0.024353027,-0.007041931,0.05041504,-0.037078857,0.029052734,-0.01399231,0.020431519,0.03665161,-0.004032135,-0.05307007,0.008781433,0.02355957,0.032165527,0.039978027,0.011833191,-0.01725769,0.0014982224,0.07531738,-0.013893127,-0.0027446747,0.008117676,0.014022827,0.024032593,-0.018051147,-0.047729492,-0.03289795,-0.041229248,-0.02973938,0.0077934265,-0.027648926,0.028961182,-0.009117126,-0.011520386,-0.013313293,0.002002716,-0.039611816,0.030029297,-0.0357666,0.0072898865,-0.008636475,-0.020690918,0.001619339,0.03363037,-0.02357483,-0.0038280487,0.04840088,0.02015686,-0.016540527,-0.030807495,-0.019012451,-0.0099105835,0.009185791,0.028167725,0.03253174,0.012634277,0.04147339,-0.032104492,0.018341064,0.018341064,0.013801575,0.046020508,-0.016326904,0.010169983,-0.051513672,-0.051605225,-0.023666382,-0.038635254,0.032073975,0.005519867,-0.00422287,0.04119873,-0.005592346,-0.008506775,-0.045928955,0.019058228,-0.03753662,-0.006500244,0.03439331,-0.0008983612,-0.046203613,-0.006259918,0.0126571655,0.0002014637,0.033233643,0.008811951,0.006839752,0.064331055,0.0390625,-0.003583908,0.016342163,0.011779785,0.018341064,-0.004447937,-0.02305603,-0.03475952,0.018218994,0.017562866,-0.0154418945,-0.012001038,-0.08166504,0.068603516,0.04006958,0.05630493,0.0056915283,0.016326904,0.04559326,-0.016860962,0.0043678284,-0.01373291,-0.009666443,-0.022323608,-0.0385437,0.03353882,-0.016448975,-0.015609741,-0.030227661,0.03466797,-0.002298355,0.0154800415,-0.046295166,0.06915283,0.009559631,0.0040283203,0.01184845,0.008239746,0.03277588,0.04837036,-0.04058838,0.015609741,0.014945984,-0.039794922,0.010261536,0.054260254,-0.0037651062,-0.019317627,-0.064453125,-0.031982422,-0.0038928986,-0.011764526,-0.048736572,-0.008201599,0.0071411133,0.015075684,0.03375244,-0.04348755,-0.038604736,0.009986877,-0.038238525,-0.053253174,-0.0066833496,-0.044067383,0.010894775,0.04107666,-0.036193848,-0.016021729,0.007850647,0.0040740967,-0.012046814,0.01600647,0.015945435,-0.005191803,-0.053833008,0.028747559,0.013000488,0.014656067,0.016479492,0.015327454,0.034423828,0.0045661926,0.05014038,0.009849548,-0.020614624,-0.045166016,0.022857666,-0.050567627,0.012123108,0.010986328,-0.019958496,-0.016464233,-0.011428833,-0.025314331,-0.03201294,0.009857178,-0.02357483,0.016433716,0.036102295,-0.042541504,-0.023422241,-0.07232666,-0.006198883,-0.008277893,0.062194824,0.026535034,-0.0015077591,-0.04751587,-0.017425537,0.011672974,0.002418518,0.012039185,-0.014427185,-0.0034732819,0.00047683716,-0.014190674,-0.008903503,-0.030227661,0.03225708,0.006702423,-0.014801025,0.02532959,0.020385742,-0.007419586,0.006336212,0.009498596,0.03591919,-0.024383545,-0.0010328293,-0.027526855,0.01876831,-0.0017995834,-0.0073890686,-0.05038452,0.042999268,0.015235901,0.03692627,-0.024383545,-0.0075569153,0.0040245056,0.014045715,0.011756897,0.0040740967,-0.010566711,0.00030255318,-0.05404663,-0.0625,0.02357483,-0.025238037,0.025390625,0.007598877,0.007598877,0.023605347,-0.015510559,-0.0015487671,0.034240723,-0.020065308,-0.0070610046,-0.037597656,-0.022979736,-0.0031604767,0.015167236,-0.027023315,0.009178162,-0.014778137,-0.0011768341,-0.009407043,-0.02330017,0.023483276,0.008033752,-0.007637024,0.019165039,0.003736496,0.018859863,0.049591064,0.0058555603,-0.027313232,0.030410767,0.002937317,0.003917694,-0.0052719116,0.044403076,0.029922485,-0.024627686,-0.0024871826,0.009498596,-0.01411438,-0.014793396,-0.013244629,0.012321472,0.027023315,0.000995636,-0.0446167,0.024612427,0.016693115,-0.032073975,-0.007537842,0.017684937,0.025466919,-0.030670166,0.044403076,0.03062439,0.057647705,-0.008598328,0.0020179749,0.008605957,0.024246216,0.027435303,0.013336182,-0.018585205,0.00484848,-0.014656067,0.008476257,-0.0129470825,0.008331299,0.02960205,-0.015419006,0.011451721,0.025634766,0.019927979,-0.025283813,-0.023483276,-0.0018606186,-0.0042762756,-0.007003784,0.018432617,0.028457642,0.020080566,-0.029785156,0.02168274,0.01335144,-0.031799316,-0.019088745,-0.015548706,0.042816162,-0.0061187744,-0.001625061,0.007499695,-0.003929138,0.01977539,-0.049957275,-0.002773285,0.017364502,0.015022278,-0.030075073,-0.050567627,-0.035583496,0.0028686523,0.03729248,0.016525269,0.024383545,0.02949524,0.006374359,-0.011650085,0.02772522,0.003768921,-0.010749817,-0.010932922,-0.026168823,-0.0028018951,0.006855011,-0.0079193115,-0.016937256,0.01953125,-0.0154953,-0.02848816,0.0065231323,-0.00039219856,-0.015808105,-0.0064697266,0.018676758,0.022857666,0.00579834,0.013168335,-0.019073486,-0.013038635,0.0073051453,0.008049011,0.004096985,-0.04083252,0.019073486,-0.017623901,-0.0061073303,-0.00869751,0.013534546,0.023971558,0.022094727,0.0041007996,0.03186035,-0.03765869,0.036193848,-0.05154419,0.018249512,0.002998352,-0.024291992,0.005634308,-0.02796936,-0.022766113,0.032409668,-0.015777588,-0.011741638,-0.026184082,-0.017623901,0.0015296936,-0.04724121,0.02746582,0.038513184,0.037017822,-0.03515625,0.0077285767,-0.00032806396,-0.0032176971,-0.022857666,0.0011978149,0.0023231506,0.024871826,0.006538391,0.00091314316,-0.040527344,-0.020736694,-0.001282692,-0.007873535,-0.036193848,-0.047454834,-0.0103302,0.025863647,-0.0015487671,0.0071411133,-0.031097412,-0.0262146,0.0060272217,-0.054107666,-0.0007171631,0.0053253174,0.005329132,0.0069503784,-0.0047950745,0.0034179688,0.036193848,-0.031463623,0.038879395,-0.007270813,-0.002439499,-0.03314209,-0.001121521,0.05593872,0.022979736,0.011695862,-0.013549805,-0.009140015,-0.015335083,-0.04724121,-0.017715454,-0.0034694672,0.00063943863,0.018127441,0.00010728836,-0.05316162,-0.019210815,-0.02053833,-0.011039734,0.032409668,0.036468506,0.019561768,-0.0076904297,-0.00023889542,-0.0085372925,-0.007575989,-0.04333496,0.010437012,0.010658264,0.0015506744,0.025436401,0.042907715,0.015701294,-0.0057029724,0.013717651,-0.004295349,0.023757935,-0.014228821,0.004386902,-0.028869629,0.017471313,0.0009698868,-0.022232056,-0.030776978,-0.009178162,0.085632324,0.0011148453,-0.0027122498,0.0037403107,-0.021331787,0.016082764,0.02458191,-0.06951904,0.002708435,-0.024642944,0.014320374,-0.019195557,0.024383545,0.004611969,-0.00061511993,-0.015335083,-0.05706787,-0.0129852295,0.008369446,-0.014434814,-0.06329346,-0.020523071,-0.04559326,-0.020355225,-0.004135132,-0.01727295,-0.0062179565,0.004714966,-0.016189575,-0.085632324,0.013679504,0.041168213,0.01411438,0.025726318,-0.025680542,-0.00070667267,0.02355957,-0.039367676,-0.015075684,0.036956787,-0.030044556,-0.0206604,-0.024032593,0.030731201,-0.022354126,-0.016937256,0.029083252,0.0050201416,0.041259766,-0.006160736,0.013587952,-0.01637268,0.0095825195,-0.016342163,0.010765076,-0.0026664734,-0.0022945404,0.019470215,-0.048583984,0.01399231,0.023498535,0.007850647,0.0049934387,0.024887085,0.027069092,-0.040100098,-0.018798828,0.020950317,-0.0047340393,0.03527832,-0.030181885,0.045959473,0.016738892,-0.020584106,0.025665283,-0.003982544,-0.02015686,-0.051483154,-0.03363037,0.016830444,0.01398468,0.029968262,-0.008201599,-0.0019550323,0.03201294,-0.011756897,0.01600647,-0.02545166,-0.01134491,-0.01576233,-0.004547119,0.0049095154,-0.001950264,0.004547119,0.033325195,0.013618469,0.03982544,0.013267517,-0.008224487,0.013717651,0.014259338,-0.019851685,-0.0038871765,0.011993408,0.007663727,0.0022621155,0.017913818,0.004142761,-0.038330078,-0.007003784,-0.039978027,-0.0069770813,0.01399231,-0.011146545,-0.01473999,-0.01309967,-0.0023117065,0.008872986,-0.042541504,0.024673462,-0.03817749,-0.021896362,-0.0032615662,-0.008918762,0.015609741,0.014541626,0.0105896,0.009536743,0.016784668,0.0692749,0.014122009,0.0077209473,0.026184082,0.041381836,0.016983032,-0.031097412,-0.010215759,0.0010385513,0.01474762,0.006965637,-0.024383545,0.017822266,0.035705566,-0.023895264,0.012535095,0.010932922,0.031829834,-0.029846191,-0.002155304,-0.00020563602,0.02142334,-0.022583008,0.02645874,-0.038330078,0.003622055,0.013000488,0.004005432,0.0043907166,-0.03326416,-0.025619507,0.0055351257,-0.0010185242,-0.024887085,0.044708252,-0.0035533905,0.029083252,-0.012672424,-0.022415161,0.0039024353,-0.045166016,-0.018692017,0.03479004,-0.009590149,-0.012840271,0.025009155,-0.027832031,0.03555298,-0.031463623,0.012382507,0.012306213,-0.0031356812,-0.016677856,0.0051956177,-0.028167725,0.00028204918,-0.007171631,-0.012237549,-0.0011997223,0.05758667,0.03277588,0.027618408,0.04144287,0.0073509216,0.0011615753,-0.043182373,-0.02204895,-0.0029449463,-0.017028809,0.01751709,-0.00039339066,0.054473877,0.034210205,-0.007335663,0.02885437,0.040374756,0.02067566,-0.010856628,0.011604309,-0.008728027,0.023406982,-0.0040512085,0.030227661,0.009269714,0.037475586,-0.037017822,-0.0037326813,0.01084137,0.015335083,-0.02482605,0.045074463,0.0758667,0.02545166,-0.0025596619,0.027618408,-0.002506256,-0.015380859,-0.021240234,-0.012817383,0.061676025,0.013458252,0.049835205,0.042999268,0.0042304993,0.005908966,0.018676758,-0.031463623,-0.0335083,0.06854248,0.01713562,-0.025863647,-0.009407043,-0.0075912476,0.002708435,-0.04800415,-0.03668213,0.0073890686,0.0035896301,-0.007461548,-0.0143966675,0.0022010803,-0.011497498,0.013320923,0.01259613,0.0022506714,-0.017974854,0.031219482,0.022094727,0.010169983,0.020874023,0.0030136108,0.03829956,-0.036254883,-0.018188477,0.017288208,0.020874023,-0.0051612854,-0.0055656433,0.012641907,0.01701355,0.057556152,0.041015625,-0.023040771,0.010070801,0.027420044,0.02229309,0.010498047,0.052001953,0.022949219,0.0069389343,0.03189087,0.037719727,0.02015686,-0.0335083,0.0034179688,0.0060310364,0.003396988,-0.012588501,-0.030807495,-0.004348755,-0.01889038,0.013366699,-0.0049743652,-0.015090942,0.032592773,0.016952515,-0.0009675026,-0.00038194656,-0.007785797,0.003818512,-0.008140564,0.00085020065,0.0146102905,-0.01121521,0.030029297,0.009803772,0.013435364,-0.033691406,0.017730713,-0.0003941059,-0.008987427,-0.003446579,0.019729614,-0.045898438,-0.002855301,-0.00046944618,-0.00466156,-0.035217285,0.0118637085,0.025268555,0.003534317,0.04498291,0.020614624,-0.012672424,0.002040863,0.013839722,0.010002136,-0.0043296814,-0.007041931,-0.03387451,0.016464233,0.0317688,-0.0034599304,0.034820557,-0.022079468,0.0011892319,0.0010690689,-0.017669678,0.006378174,-0.0002901554,-0.035980225,-0.02720642,0.018753052,0.04147339,0.025024414,0.028457642,-0.0020141602,-0.0262146,0.0051879883,0.026123047,0.013435364,0.017669678,-0.0051231384,0.020889282,-0.005870819,0.051940918,0.02986145,0.0021648407,0.016464233,-0.025512695,-0.024795532,0.01084137,-0.020004272,0.024276733,-0.01424408,0.010360718,-0.0054969788,0.024642944,-0.014526367,-0.028533936,0.01084137,-0.016479492,-0.0032310486,-0.028640747,0.0020942688,0.012191772,0.028335571,0.05331421,0.024108887,-0.026870728,0.062194824,-0.011367798,0.049316406,-0.02230835,-0.010353088,0.043914795,0.036376953,0.033935547,0.0033092499,0.012748718,-0.020706177,0.010932922,0.052947998,0.029785156,-0.0027561188,-0.01007843,-0.027359009,0.024246216,0.016998291,0.03289795,-0.008010864,-0.009719849,0.0035076141,-0.012329102,-0.00970459,0.0046958923,-0.009895325,-0.0041999817,0.044921875,-0.03567505,-0.02142334,-0.018051147,-0.020950317,0.019744873,-0.0035572052,0.007194519,-0.0040779114,-0.025222778,0.019210815,-0.026870728,0.0001654625,0.0011425018,0.028060913,-0.042297363,-0.0231781,0.002040863,0.023040771,-0.02420044,0.021316528,0.03479004,-0.012252808,0.015167236,0.0362854,-0.00390625,0.039642334,-0.00016653538,0.02796936,0.051635742,-0.0024585724,-0.01084137,0.015388489,0.015625,-0.017456055,0.011253357,0.03756714,-0.0118637085,0.007335663,-0.002363205,-0.023208618,0.00060653687,0.0058135986,0.0073623657,-0.00831604,-0.0029907227,-0.0012607574,-0.007160187,0.017166138,0.005443573,0.009117126,-0.014518738,-0.009178162,0.028533936,0.032440186,0.0048065186,-0.036468506,-0.009162903,0.014320374,0.012702942,-0.0049858093,-0.019882202,-0.025878906,-0.04135132,0.003047943,0.023925781,0.0087890625,0.002861023,-0.020233154,-0.0012655258,0.018035889,0.01890564,0.006248474,0.005290985,-0.010620117,0.0014781952,-0.023040771,-0.008308411,-0.013076782,-0.014709473,0.012641907,0.027877808,-0.007205963,-0.025131226,0.016921997,0.0063209534,0.0070762634,-0.0019273758,-0.013587952,0.026947021,-0.021453857,-0.017196655,-0.0057258606,0.018127441,-0.014411926,-0.020080566,-0.02003479,0.026565552,0.04849243,-0.013748169,-0.02029419,0.012489319,-0.0003809929,0.02142334,0.030441284,0.0031871796,0.04876709,0.025665283,-0.0074005127,-0.017562866,0.015548706,-0.02015686,-0.028793335,0.00617218,-0.0037994385,-0.018661499,0.02029419,0.0031032562,-0.014297485,-0.02835083,-0.025543213,-0.010231018,-0.020187378,0.023590088,-0.007873535,0.009613037,-0.025924683,-0.0059776306,-0.0059394836,-0.00012207031,-0.04269409,-0.017974854,-0.008460999,-0.02230835,-0.051483154,0.005760193,-0.030258179,0.0073890686,-0.017471313,-0.01007843,0.0066375732,0.04586792,-0.01626587,0.01260376,-0.0017251968,0.020599365,0.021224976,0.010353088,0.024612427,-0.014259338,-0.028427124,-0.027420044,0.004623413,-0.021575928,0.018585205,0.0050849915,0.043029785,0.009727478,-0.005138397,-0.0047416687,-0.008796692,-0.0003721714,-0.010192871,-0.023208618,-0.018844604,0.016067505,0.022079468,-0.005558014,-0.0071144104,0.043914795,-0.026428223,-0.008766174,0.014961243,0.05291748,-0.00045204163,0.038848877,-0.012680054,-0.014839172,-0.013435364,-0.0020046234,-0.02267456,0.012817383,0.018157959,0.01789856,-0.0020809174,-0.013694763,0.009086609,-0.022521973,0.00566864,0.016616821,-0.0054130554,-0.017288208,0.031066895,0.013916016,0.004749298,-0.013671875,-0.013916016,0.004524231,0.03378296,0.013420105,0.004032135,-0.000161767,0.0154800415,-0.018554688,0.0058021545,-0.000005185604,-0.020721436,-0.037261963,-0.021362305,-0.047210693,0.024490356,0.014762878,0.012954712,-0.00082063675,0.018341064,-0.019378662,-0.03994751,-0.0075645447,0.02104187,0.0076560974,-0.016845703,-0.009170532,-0.0039520264,0.017089844,-0.016693115,0.0021266937,-0.037353516,-0.028121948,-0.0069274902,-0.02482605,0.022949219,0.0049591064,-0.009292603,0.0058250427,0.0015821457,0.0121154785,0.0024757385,0.028671265,-0.0007624626,-0.0046195984,0.0017652512,0.0058135986,-0.021453857,0.012641907,-0.016296387,-0.007911682,0.026977539,-0.015014648,0.010986328,-0.011131287,0.019134521,-0.0018224716,-0.0067100525,0.034179688,0.0074653625,0.00957489,-0.030807495,0.0018129349,0.000995636,0.0029258728,0.030548096,-0.013748169,-0.014671326,0.013267517,-0.021865845,-0.031585693,-0.00041747093,0.034179688,0.036590576,-0.010665894,0.027389526,-0.007888794,-0.0016975403,0.022766113,-0.0009112358,-0.019699097,-0.009727478,0.057647705,-0.0027618408,-0.0026950836,-0.006351471,0.0063934326,-0.018722534,-0.011039734,0.015945435,-0.0018796921,-0.012069702,0.022384644,0.0006303787,0.032592773,0.00831604,0.013069153,0.013496399,0.0071792603,0.027160645,0.0035972595,0.04525757,-0.006187439,-0.03439331,0.0032024384,0.024093628,-0.0234375,-0.006717682,-0.0029697418,0.0074424744,-0.043640137,0.026565552,-0.007160187,0.03781128,-0.018600464,0.01638794,-0.026626587,-0.023529053,-0.019302368,-0.007217407,-0.039093018,0.009544373,0.048797607,0.008239746,0.011291504,0.0021343231,-0.03475952,0.041870117,0.056121826,0.0075569153,-0.025802612,-0.009544373,0.0093307495,-0.003643036,-0.00894165,0.008895874,-0.021057129,-0.019500732,0.0017671585,-0.024795532,0.017654419,0.00025606155,0.0063095093,0.004901886,-0.0075302124,0.0042381287,0.02330017,-0.0002194643,0.00085163116,-0.0040283203,-0.002658844,0.043884277,0.024612427,-0.00712204,0.03173828,0.016021729,-0.027160645,0.052337646,-0.013206482,0.016937256,-0.02017212,0.007499695,-0.03970337,-0.01991272,-0.01133728,0.0032958984],"createdAt":"2026-04-18T19:29:22.913Z","updatedAt":"2026-04-22T11:32:34.181Z","lastSeenAt":"2026-04-22T11:32:34.181Z","tsv":"'/api':175 '/api/v1/apikeys/49':116 '/apikeys/49':215 '/docs':173 '/pricing':174 '/readme':177 '0.02':9,22,92,144 '000':133 '0x8335':138 '20':132 '2913':139 '300':157 '6':142 'Base network API' 'USDC micropayment API' 'accept':162 'access':3,16,34,122 'actual':208 'ai':61 'ai-inference' 'analysi':65 'analyt':55 'api':2,15,33,52,104,121,224 'api-key-management' 'application/json':167 'avail':203 'base':8,21,100,134,141 'behind':210 'broad':45 'call':51,146 'catalog':46 'challeng':128 'classif':68 'commit':112 'connect':183 'contact':236 'content':189 'convers':85 'crawl':206 'crypto-paid API' 'data':54,58 'data-analytics' 'decim':143 'detail':240 'document':168,198 'embed':69 'endpoint':28,88,115,161,213 'estim':79 'exact':153 'exampl':202 'exchang':74 'expect':232 'experi':234 'export':59 'extrem':170 'feed':73 'financ':70 'finance-data' 'function':209 'gas':78 'gate':35 'generat':86 'geocod':83 'geocoding' 'http':163 'infrastructur':81 'insight':60 'key':105,225 'learn':63 'limit':108 'list':118 'live':126 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':149 'may':219 'metric':56 'micropay':6,19 'micropayment' 'minimum':111 'network':101 'offer':43 'openapi':193 'page':178 'particular':212 'path':214 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':39,147 'per':10,23,50,93,145 'post':164 'premium':1,14,32,120 'premium API access' 'price':72,90 'prompt':185 'protocol':40 'provid':31,238 'provis':220 'quot':77 'rate':75,107 'render':180 'report':57 'request':11,24,94,129 'request/response':196 'retriev':222 'return':124,166 'schema':197 'scheme':154 'second':158 'sentiment':64 'settl':95 'site':42 'span':53 'spars':171 'spec':194 'specif':114 'specul':229 'summar':67 'text':66 'timeout':159 'token':76 'unclear':217 'unit':135 'usag':201 'usdc':13,26,97,137 'usdc-base' 'user':230 'util':82 'utility-services' 'valid':84 'via':4,17,150 'wallet':184 'web3':71 'web3-data' 'x402':5,18,38,127,152 'x402 API' 'x402-payment'","prices":[{"id":"37df09e1-9da9-4961-9f10-59a183ff6381","listingId":"5ee566ae-d94f-4396-b7fb-2566bccc16e1","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/apikeys/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:22.913Z"}],"sources":[{"listingId":"5ee566ae-d94f-4396-b7fb-2566bccc16e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:22.913Z","lastSeenAt":"2026-04-22T11:32:34.181Z"}],"details":{"listingId":"5ee566ae-d94f-4396-b7fb-2566bccc16e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/49 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/apikeys/49"},{"claim":"Endpoint accepts HTTP POST and returns application/json with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/apikeys/49"},{"claim":"Site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without traditional API key signup or subscription","Paying per-request for AI inference, analytics, or financial data via USDC on Base","Integrating pay-as-you-go API calls into autonomous agent workflows"],"bestFor":["Developers who want zero-commitment, pay-per-call API access","AI agents that can settle x402 micropayments on Base","Projects needing quick access to diverse utility APIs without onboarding friction"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.518Z"},"updatedAt":"2026-04-22T11:32:34.181Z"}}