{"id":"55eb5da6-d438-4822-b6ec-0a9bba894350","shortId":"jGK2r4","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad suite of 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/keys/42` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required — callers simply attach an X-PAYMENT header to each request. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the \"Premium API Access\" label at `/api/v1/keys/42` is unclear — it may be an API-key generation or management endpoint, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","no-auth api","web3 api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The exact purpose of /api/v1/keys/42 is unclear; 'Premium API Access' could mean API key generation or something else entirely","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content","No examples, error codes, or rate-limit information documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/42","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/keys/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/keys/42 ('Premium API Access') 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":"2026-04-21T22:27:53.147Z","embedding":[-0.012245178,-0.021118164,0.04425049,0.008735657,0.017364502,-0.027618408,-0.022491455,0.044006348,0.06304932,-0.06945801,0.028015137,-0.0501709,-0.026306152,-0.04156494,-0.022537231,0.004825592,-0.014312744,0.0028476715,-0.04348755,0.025299072,0.022079468,-0.025726318,-0.01486969,0.030593872,0.0036582947,-0.015914917,-0.0027065277,-0.020584106,-0.01184082,-0.036590576,0.053375244,-0.027389526,-0.008087158,0.012924194,-0.015319824,-0.01234436,-0.007183075,0.021392822,0.031066895,-0.0067214966,-0.0065307617,-0.060058594,-0.0013055801,-0.0057029724,-0.051239014,-0.00579834,0.009300232,-0.01461792,-0.00365448,0.011497498,-0.037231445,-0.011054993,-0.00730896,0.0074157715,0.005542755,0.013191223,-0.010772705,-0.0045433044,0.009170532,0.0038833618,0.004306793,-0.04333496,-0.026016235,0.0062713623,-0.0050964355,0.053131104,-0.017501831,0.053131104,0.0069732666,0.05090332,0.045898438,0.051086426,0.019989014,0.015106201,0.00086069107,0.002456665,-0.011711121,0.06311035,-0.012069702,-0.0211792,-0.016860962,-0.009086609,-0.036834717,-0.003627777,-0.0154418945,-0.053009033,-0.019210815,0.0154418945,-0.021331787,0.03274536,-0.0680542,-0.02142334,-0.020111084,0.010795593,0.0075263977,0.0107803345,-0.0031108856,0.01977539,-0.02659607,0.019317627,-0.006866455,-0.041412354,0.007335663,0.007156372,0.043182373,0.04623413,0.007575989,0.01637268,0.010826111,-0.0211792,-0.06213379,0.010177612,-0.020812988,-0.011230469,0.012252808,0.0020961761,-0.017807007,0.0052757263,-0.032684326,-0.0014104843,-0.05718994,0.04711914,0.025894165,0.006214142,0.0030231476,-0.05783081,-0.012275696,0.0032043457,-0.028396606,-0.030029297,0.0014448166,0.01889038,0.022125244,-0.021331787,-0.033233643,0.0132751465,-0.010391235,-0.027023315,-0.043701172,-0.033813477,0.03756714,-0.036102295,0.03540039,0.03277588,-0.107788086,-0.028015137,-0.04940796,0.0020198822,-0.034210205,0.0010261536,0.0031108856,0.027938843,-0.022415161,-0.012397766,-0.012176514,-0.013809204,0.006023407,0.022766113,-0.01586914,0.046417236,-0.01878357,0.041656494,0.018875122,0.008033752,0.022354126,0.029693604,0.005241394,-0.08862305,-0.08343506,-0.029663086,-0.007835388,-0.029449463,-0.023864746,0.016784668,-0.0104599,-0.058380127,-0.017166138,-0.0026378632,-0.004173279,-0.046325684,-0.008644104,-0.022979736,0.009391785,-0.0029945374,-0.05593872,-0.0128479,-0.016723633,0.06726074,0.014831543,0.018875122,0.032318115,-0.012397766,0.06542969,0.021377563,-0.015777588,-0.033203125,0.011688232,-0.020111084,0.019256592,0.0008845329,-0.00081539154,-0.037872314,0.03933716,0.058898926,0.017303467,-0.010391235,-0.00945282,-0.05154419,-0.046203613,-0.034851074,0.019302368,0.0066871643,0.006111145,0.046905518,-0.043762207,-0.03314209,-0.008384705,0.008071899,0.019607544,0.075927734,-0.0026226044,-0.011352539,0.0206604,0.018539429,-0.039154053,0.038360596,0.034576416,0.017074585,-0.02619934,-0.017623901,0.035736084,0.024337769,-0.017929077,0.0043029785,-0.028121948,0.033843994,0.00932312,0.0038490295,0.023788452,-0.019485474,-0.01663208,-0.029403687,-0.026931763,0.03543091,-0.0033245087,-0.013015747,-0.039215088,-0.082336426,0.050811768,0.01965332,0.04928589,-0.018127441,0.0024261475,-0.0211792,-0.0046310425,-0.067993164,0.058746338,0.08111572,0.015449524,-0.014595032,0.0093307495,-0.004501343,-0.030853271,-0.0002989769,-0.007820129,-0.033477783,-0.015670776,0.013008118,-0.04928589,-0.017059326,0.026992798,0.028121948,0.064331055,-0.015899658,-0.03656006,-0.024993896,-0.0016937256,0.0006713867,-0.03161621,0.00012564659,-0.004421234,0.00674057,0.03363037,-0.0072364807,0.023345947,-0.002193451,0.0041770935,-0.007118225,-0.0129470825,-0.023986816,-0.022857666,0.012794495,0.009468079,-0.051239014,0.016860962,-0.00074338913,0.06213379,-0.03717041,0.03111267,-0.0070228577,0.010185242,0.03829956,-0.0023708344,-0.04916382,0.009902954,0.027648926,0.022445679,0.059783936,0.008872986,-0.036743164,-0.006286621,0.07550049,-0.007881165,-0.007785797,0.001115799,0.0035953522,0.033203125,-0.02180481,-0.05859375,-0.03363037,-0.012176514,-0.031066895,0.013290405,-0.023956299,0.023773193,-0.010902405,-0.0020961761,-0.01676941,0.016464233,-0.036010742,0.03237915,-0.02468872,-0.0008120537,-0.0063552856,-0.035064697,-0.0014734268,0.02279663,-0.011917114,-0.0010757446,0.028869629,0.0209198,-0.01033783,-0.042022705,-0.024276733,-0.012290955,-0.0073509216,0.026657104,0.030090332,0.014404297,0.05380249,-0.024459839,0.005821228,0.028869629,0.025131226,0.02619934,-0.02041626,0.004787445,-0.07043457,-0.049560547,-0.024932861,-0.03677368,0.020996094,0.01626587,-0.0027980804,0.04852295,-0.0009832382,-0.025863647,-0.05444336,0.02796936,-0.035064697,-0.005672455,0.029373169,-0.014274597,-0.04244995,-0.0035152435,0.0014066696,0.011993408,0.03955078,0.007522583,0.011894226,0.066467285,0.042541504,-0.0041503906,0.021621704,0.005355835,0.027359009,0.022628784,-0.018463135,-0.034973145,0.0016441345,0.030822754,-0.021759033,-0.023757935,-0.07672119,0.072387695,0.045318604,0.06903076,0.016616821,0.015296936,0.04095459,-0.016281128,0.009521484,-0.016326904,-0.016540527,-0.017059326,-0.038391113,0.04257202,-0.015792847,0.000065386295,-0.025894165,0.046447754,-0.005634308,0.024765015,-0.037750244,0.05508423,-0.0057640076,0.0011110306,0.000094890594,0.0046310425,0.047668457,0.06530762,-0.05899048,0.02458191,0.019622803,-0.042907715,0.009559631,0.05239868,-0.013664246,-0.0052375793,-0.064941406,-0.025421143,-0.007835388,-0.0067863464,-0.052124023,-0.0020256042,0.009712219,0.011520386,0.045959473,-0.037963867,-0.01424408,-0.0016336441,-0.026977539,-0.059173584,-0.0013246536,-0.047821045,0.0005168915,0.040252686,-0.03640747,-0.030426025,0.0055389404,-0.01007843,-0.0043945312,0.010467529,0.0340271,-0.005897522,-0.042755127,0.03717041,0.007987976,0.014343262,0.010734558,0.035949707,0.020645142,0.016738892,0.046569824,0.007282257,-0.021331787,-0.057617188,0.032287598,-0.05480957,0.008583069,0.022201538,-0.012184143,-0.004245758,-0.0071487427,-0.038482666,-0.038024902,0.01235199,-0.026931763,0.0061798096,0.024002075,-0.037902832,-0.018310547,-0.057403564,-0.009170532,-0.0045433044,0.0736084,0.024291992,-0.007282257,-0.048583984,-0.0017709732,0.013847351,-0.00094270706,0.044525146,-0.014961243,-0.0088272095,-0.006122589,-0.027282715,-0.009277344,-0.023651123,0.024124146,-0.005809784,-0.011077881,0.018569946,0.0209198,0.004383087,0.01020813,0.008872986,0.016540527,-0.037353516,-0.008735657,-0.015136719,0.028045654,0.009780884,-0.0018358231,-0.037261963,0.040802002,0.0231781,0.02999878,-0.02508545,-0.009124756,0.0016937256,0.015029907,0.021148682,-0.011100769,-0.015914917,-0.011054993,-0.05609131,-0.05230713,0.03604126,-0.025787354,0.017730713,0.017562866,0.011054993,0.020080566,-0.02243042,0.013534546,0.024810791,-0.03213501,-0.009422302,-0.026733398,-0.030593872,-0.017364502,0.013824463,-0.0287323,0.018981934,-0.013557434,0.0021915436,-0.0027885437,-0.027496338,0.027893066,0.016281128,-0.013755798,0.016921997,0.002948761,0.025054932,0.051361084,0.002494812,-0.03967285,0.021087646,-0.0049438477,0.018157959,-0.004207611,0.048034668,0.039154053,-0.013969421,-0.0041923523,0.009841919,-0.019851685,-0.0090408325,-0.0028839111,0.0032672882,0.018707275,-0.009994507,-0.04626465,0.012649536,0.013969421,-0.024887085,-0.020187378,0.022399902,0.015106201,-0.03326416,0.028762817,0.022598267,0.051452637,-0.022766113,0.0043525696,0.014450073,0.023925781,0.02923584,0.0047187805,-0.01234436,0.009887695,-0.018203735,0.007434845,-0.016738892,0.013420105,0.0256958,-0.00945282,0.011917114,0.036376953,0.016967773,-0.027297974,-0.032287598,0.006965637,-0.026397705,-0.02204895,0.011871338,0.024383545,0.01751709,-0.029449463,0.021865845,0.008987427,-0.01424408,-0.009422302,-0.013893127,0.039611816,-0.0128479,-0.011985779,0.01701355,-0.0076942444,0.020965576,-0.045898438,-0.0072631836,0.017623901,0.021438599,-0.036254883,-0.054656982,-0.04296875,0.006500244,0.038085938,0.008888245,0.024139404,0.03579712,0.004650116,-0.0011901855,0.021713257,0.0014247894,-0.024215698,-0.005355835,-0.029953003,-0.02456665,-0.0034370422,0.007083893,-0.028869629,0.015350342,-0.0020198822,-0.033081055,0.007171631,-0.0002872944,-0.012680054,-0.003293991,0.008712769,0.04296875,0.0032157898,0.020370483,-0.020187378,-0.029296875,0.00007098913,0.0030918121,0.018341064,-0.055023193,0.025100708,-0.012130737,-0.022842407,-0.0090789795,0.011047363,0.016418457,0.032989502,0.017837524,0.026489258,-0.05581665,0.049224854,-0.04437256,0.019195557,-0.004283905,-0.034576416,-0.003982544,-0.033294678,-0.017364502,0.04067993,-0.020523071,-0.0069236755,-0.03552246,-0.027999878,-0.0052223206,-0.053771973,0.0181427,0.042541504,0.04257202,-0.027679443,0.0032081604,-0.0008969307,0.003736496,-0.01838684,-0.000045120716,0.0015869141,0.02558899,0.017684937,0.00076436996,-0.021316528,-0.023727417,-0.024673462,-0.017440796,-0.049713135,-0.062561035,-0.007686615,0.011009216,-0.0063095093,-0.012840271,-0.033172607,-0.039733887,0.00655365,-0.04220581,0.007904053,-0.00033450127,0.009841919,0.0039138794,-0.017990112,0.013877869,0.03201294,-0.027038574,0.033691406,-0.0023841858,-0.005428314,-0.030059814,0.013336182,0.0309906,0.015670776,0.005168915,-0.008850098,-0.008041382,-0.02142334,-0.046447754,-0.012039185,-0.009613037,-0.014167786,-0.012336731,0.0024223328,-0.05480957,-0.008056641,-0.022705078,-0.010948181,0.03765869,0.028869629,0.005973816,-0.011985779,0.014038086,-0.00042653084,-0.010803223,-0.033416748,0.009941101,0.011161804,-0.0007276535,0.021011353,0.046966553,0.0061073303,-0.020767212,0.01802063,0.013771057,0.029891968,-0.014007568,-0.0074539185,-0.025985718,0.010810852,-0.010925293,-0.011810303,-0.035583496,-0.008415222,0.083984375,0.0067481995,-0.009178162,-0.011108398,-0.013023376,0.016326904,0.023605347,-0.05581665,0.0020256042,-0.029083252,0.015777588,-0.023284912,0.024230957,0.00024557114,0.01499176,-0.013496399,-0.05303955,-0.007949829,0.009140015,-0.007659912,-0.06750488,-0.019577026,-0.04788208,0.0010280609,-0.0035743713,-0.025772095,-0.0049819946,0.008583069,-0.013244629,-0.083496094,0.011657715,0.050964355,0.00831604,0.017974854,-0.0067749023,0.01159668,0.016235352,-0.023513794,-0.012367249,0.031433105,-0.03164673,-0.02558899,-0.01424408,0.020889282,-0.011711121,-0.011756897,0.015350342,-0.0035095215,0.02999878,0.002336502,0.0056648254,-0.020339966,0.021987915,-0.030563354,0.01499176,-0.00089788437,-0.007472992,0.029129028,-0.049591064,0.018798828,0.014434814,-0.0071640015,0.0062561035,0.028701782,0.042755127,-0.04168701,-0.025894165,0.029052734,-0.0006670952,0.030822754,-0.026184082,0.0446167,0.014976501,-0.020874023,0.01828003,-0.0068969727,-0.01322937,-0.045898438,-0.03933716,0.025009155,0.0026435852,0.012802124,-0.014205933,-0.002910614,0.03567505,-0.009109497,0.012565613,-0.016174316,-0.025390625,-0.027359009,-0.0011463165,-0.0004184246,0.0077209473,0.0049972534,0.029586792,0.019882202,0.0345459,0.0087890625,-0.0053100586,0.014183044,0.024383545,-0.013473511,-0.0014982224,0.01838684,0.007888794,0.0085372925,0.02192688,0.0032901764,-0.04156494,0.008148193,-0.02998352,-0.0236969,0.010009766,-0.0054359436,-0.024291992,-0.0073280334,0.008171082,-0.00390625,-0.035705566,0.013496399,-0.03668213,-0.022323608,0.0006337166,-0.007843018,0.018325806,0.012145996,0.0069503784,0.009788513,0.0017309189,0.05960083,0.00063991547,-0.010635376,0.020874023,0.024963379,0.020980835,-0.03515625,-0.0037879944,-0.01084137,0.007881165,0.0020103455,-0.04071045,0.014312744,0.037628174,-0.022781372,0.009643555,0.01134491,0.02709961,-0.026763916,-0.0018491745,-0.0025577545,0.02218628,-0.021347046,0.030426025,-0.043914795,0.01727295,0.019180298,0.01309967,-0.011909485,-0.025482178,-0.02470398,0.01928711,0.0050315857,-0.0206604,0.052642822,0.00067710876,0.026290894,-0.011245728,-0.020492554,0.006072998,-0.037841797,-0.02192688,0.02859497,-0.007396698,-0.00178051,0.018615723,-0.019729614,0.0317688,-0.041229248,0.012001038,0.010795593,-0.002773285,-0.008003235,-0.002910614,-0.015670776,0.0069770813,-0.018600464,-0.006965637,0.0010385513,0.054382324,0.0340271,0.028701782,0.04324341,0.0056419373,0.004497528,-0.036071777,-0.01953125,0.0010986328,-0.02368164,0.017974854,-0.007686615,0.045959473,0.041290283,0.001666069,0.031341553,0.03869629,0.024765015,-0.0041046143,0.009552002,-0.01448822,0.014801025,-0.004814148,0.027618408,0.0054969788,0.03717041,-0.03866577,0.01576233,0.01826477,0.01725769,-0.02355957,0.034942627,0.058898926,0.027694702,-0.010940552,0.030273438,0.0030612946,-0.0030937195,-0.01474762,-0.023971558,0.048797607,0.018920898,0.047790527,0.043945312,0.0054512024,0.010467529,0.024520874,-0.027191162,-0.02696228,0.07092285,0.020965576,-0.015464783,-0.010215759,-0.009819031,0.010879517,-0.045135498,-0.033325195,0.0178833,-0.0036640167,0.00073480606,-0.020904541,-0.008911133,-0.011627197,0.00006842613,0.014511108,0.008087158,-0.012367249,0.02709961,0.021194458,0.0042037964,0.029296875,-0.005332947,0.03857422,-0.028900146,-0.026382446,0.016052246,0.017456055,-0.009475708,-0.00043082237,0.020477295,0.011886597,0.042755127,0.03729248,-0.016464233,0.011703491,0.029663086,0.014564514,0.013008118,0.06359863,0.034362793,0.0109939575,0.030273438,0.035308838,0.029205322,-0.03955078,0.006965637,0.009208679,0.0019683838,-0.016296387,-0.024765015,-0.0021839142,-0.009063721,0.018157959,-0.00699234,-0.015853882,0.025985718,0.021728516,-0.0019483566,-0.0050468445,-0.0064926147,0.007434845,-0.01637268,-0.002231598,0.018218994,-0.018310547,0.032440186,0.011726379,0.022979736,-0.024520874,0.021316528,0.0020160675,-0.020141602,-0.0076141357,0.026000977,-0.037261963,0.011192322,-0.0009918213,-0.005973816,-0.04812622,0.0072898865,0.025924683,-0.0056991577,0.03515625,0.012748718,-0.005207062,-0.0035953522,0.008346558,0.00642395,-0.0062217712,-0.010498047,-0.025497437,0.026870728,0.03540039,-0.0021343231,0.022583008,-0.009933472,-0.005207062,0.00039172173,-0.014205933,0.0065994263,-0.013900757,-0.02130127,-0.030639648,0.01071167,0.039520264,0.024673462,0.046173096,-0.009109497,-0.017242432,0.013900757,0.033691406,0.005748749,0.013549805,-0.0032444,0.026733398,-0.01512146,0.044006348,0.03881836,0.018310547,0.03756714,-0.019500732,-0.004386902,0.01878357,-0.005870819,0.023162842,-0.018676758,0.005344391,-0.0025634766,0.02583313,-0.0154418945,-0.04135132,0.020584106,-0.019683838,-0.015930176,-0.017562866,0.001329422,0.00844574,0.030456543,0.043273926,0.023849487,-0.037109375,0.06048584,-0.015388489,0.05117798,-0.016601562,-0.029449463,0.0362854,0.03314209,0.02293396,0.0079574585,0.023239136,-0.034301758,0.010650635,0.042938232,0.03152466,0.000025749207,-0.0008740425,-0.015609741,0.033569336,0.0029792786,0.026351929,-0.006175995,0.005241394,0.01084137,-0.009254456,-0.007030487,-0.002916336,-0.005519867,-0.008361816,0.037872314,-0.033203125,-0.014144897,-0.02609253,-0.021987915,0.024993896,-0.012145996,0.0021381378,-0.00793457,-0.026947021,0.011413574,-0.028198242,-0.019256592,0.0058937073,0.024627686,-0.04244995,-0.014923096,0.0013256073,0.01676941,-0.023620605,0.02267456,0.02116394,-0.009857178,0.007621765,0.0463562,-0.012763977,0.026657104,-0.009994507,0.020004272,0.0418396,0.0047454834,-0.01828003,0.00055503845,0.011512756,-0.01612854,0.024383545,0.030929565,-0.010986328,-0.0007920265,-0.002752304,-0.005004883,-0.0077400208,-0.0043296814,-0.0016441345,0.0033359528,-0.0068473816,-0.0027389526,0.0013170242,0.011894226,0.006580353,0.008369446,-0.016952515,-0.022613525,0.017562866,0.037994385,0.014549255,-0.032928467,-0.01259613,0.0026988983,0.010864258,-0.009971619,-0.00907135,-0.015914917,-0.039978027,0.012245178,0.026306152,0.009124756,0.012207031,-0.028686523,-0.0020866394,0.012817383,-0.0042800903,0.013191223,0.0044822693,-0.021987915,0.0034923553,-0.0135269165,-0.018508911,-0.012329102,-0.014038086,0.010871887,0.02330017,0.002090454,-0.027435303,0.02166748,-0.0015277863,0.016937256,-0.00028252602,-0.009674072,0.022201538,-0.009666443,-0.0118637085,-0.0016746521,0.024459839,-0.01449585,-0.009742737,-0.014450073,0.037902832,0.04324341,-0.016296387,-0.015609741,0.015586853,0.009643555,0.021835327,0.040374756,0.009025574,0.03970337,0.02267456,-0.015914917,-0.021621704,0.016937256,-0.003622055,-0.030319214,0.006046295,-0.0017976761,-0.024276733,0.029632568,0.0046691895,-0.0058937073,-0.035369873,-0.02116394,-0.006340027,-0.016098022,0.0178833,-0.004333496,0.016525269,-0.013771057,-0.012718201,-0.0015907288,-0.00598526,-0.05709839,-0.019577026,0.0013628006,-0.008712769,-0.060394287,0.0035991669,-0.036346436,0.009971619,-0.013076782,-0.012145996,-0.0043678284,0.03668213,-0.011192322,0.0040779114,0.0033740997,0.020996094,0.025344849,0.006919861,0.02067566,-0.017120361,-0.017837524,-0.027175903,0.019073486,-0.01637268,0.021697998,0.0050086975,0.038146973,0.015975952,-0.0061912537,0.00014781952,-0.009315491,-0.0003976822,-0.014091492,-0.017333984,-0.023757935,0.025360107,0.014144897,-0.003446579,-0.0033988953,0.03540039,-0.028182983,-0.0031547546,0.024276733,0.04827881,0.0020694733,0.028762817,-0.016494751,-0.0010223389,-0.0072631836,0.0015525818,-0.014022827,0.008964539,0.020599365,0.011917114,-0.010375977,0.008110046,0.010040283,-0.016479492,-0.0013523102,0.02268982,0.0046539307,-0.010192871,0.034851074,0.021026611,0.012367249,-0.008735657,-0.016784668,0.025039673,0.038146973,0.012145996,0.011001587,0.005432129,0.014831543,-0.019104004,0.008644104,-0.003364563,-0.025497437,-0.03253174,-0.02166748,-0.03491211,0.025100708,0.004676819,0.0087890625,-0.0015621185,0.011795044,-0.016159058,-0.03274536,-0.014045715,0.019195557,0.009254456,-0.020889282,-0.008102417,0.005264282,0.016418457,-0.027694702,-0.0029335022,-0.03768921,-0.035705566,-0.0011644363,-0.018173218,0.018295288,0.009307861,-0.0049743652,0.0014696121,-0.0030994415,0.004508972,-0.011642456,0.024841309,-0.0069999695,0.0003092289,0.010894775,0.008285522,-0.018981934,0.009407043,-0.008460999,0.0024356842,0.01586914,-0.011665344,0.01448822,-0.007926941,0.034088135,-0.006427765,-0.0033893585,0.03515625,0.0029277802,0.014038086,-0.028656006,0.0050582886,0.004020691,-0.0021591187,0.04623413,-0.01727295,-0.02255249,0.006778717,-0.01675415,-0.018173218,0.0034103394,0.022216797,0.031463623,-0.012763977,0.038208008,-0.0037212372,0.0029563904,0.018875122,0.015777588,-0.007598877,-0.0029315948,0.041992188,0.010749817,0.00027513504,-0.008888245,-0.009048462,-0.032592773,-0.01260376,0.023452759,-0.008239746,-0.005683899,0.019683838,0.002161026,0.03555298,-0.001490593,0.012886047,0.011077881,0.00017499924,0.026916504,0.0009088516,0.050567627,-0.012359619,-0.032165527,0.003774643,0.008422852,-0.024612427,0.0037403107,-0.0008254051,-0.0012292862,-0.037506104,0.025817871,-0.005836487,0.0256958,-0.021148682,0.016052246,-0.024276733,-0.013046265,-0.037750244,-0.014511108,-0.034057617,0.0016708374,0.03363037,0.005493164,0.023986816,0.0046195984,-0.025161743,0.038085938,0.050598145,0.0061531067,-0.020187378,-0.015335083,0.003396988,-0.000497818,0.0057907104,0.016098022,-0.025283813,-0.016021729,0.0039596558,-0.024810791,0.010406494,-0.010307312,0.013496399,0.0052108765,-0.005832672,0.000521183,0.026428223,-0.0005264282,0.00094747543,0.013717651,0.0012674332,0.045440674,0.016448975,-0.013549805,0.019104004,0.008956909,-0.03857422,0.05419922,-0.009094238,0.03024292,-0.013442993,0.011695862,-0.045959473,-0.018218994,-0.0020370483,0.003993988],"createdAt":"2026-04-21T18:32:23.863Z","updatedAt":"2026-04-22T01:02:19.297Z","lastSeenAt":"2026-04-22T01:02:19.297Z","tsv":"'/api':188 '/api/v1/keys/42':112,233 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,95,133 '000':128 '20':127 '402':122 '6':138 'accept':174 'access':118,230 'across':54 'addit':202 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,152,229,241 'api-key':240 'application/json':179 'attach':163 'avail':218 'base':8,27,103,129,141 'base usdc api' 'behind':226 'beyond':181 'broad':50 'call':4,23 'caller':161 'categori':56 'challeng':123 'cheap api access' 'classif':71 'classification' 'connect':197 'convers':88 'crawl':221 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':139 'detail':204 'document':180,213 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,173,246 'estim':82 'exact':148,224 'exampl':217 'exchang':77 'export':62 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':225 'gas':81 'generat':89,243 'geocod':86 'geocoding' 'header':168 'infrastructur':84 'insight':63 'key':153,242 'label':231 'land':183 'learn':66 'limit':156 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':144 'manag':245 'materi':222 'may':237 'metric':59 'micropayment api' 'network':104 'no-auth api' 'offer':10,29 'openapi':208 'page':184,192 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':142,167 'per':3,22,96 'platform':6,25,46 'post':175 'premium':116,228 'price':75,93 'prompt':199 'protocol':108 'provid':48 'quot':80 'rate':78,155 'report':60 'request':97,124,171,176 'request/response':211 'requir':160 'resolv':194 'return':120,178 'schema':212 'scheme':149 'sentiment':67 'sentiment-analysis' 'settl':98 'simpli':162 'sinc':135 'spars':186 'spec':209 'specif':110 'specul':250 'subscript':159 'suit':51 'summar':70 'technic':203 'text':69 'text-summarization' 'token':79 'unclear':235 'unit':130 'usag':216 'usd':134 'usdc':9,28,100,132,136 'usdc-base' 'use':137 'util':15,34,85 'utility-apis' 'valid':87 'via':105,145 'wallet':198 'web3':74 'web3 api' 'x':166 'x-payment':165 'x402':43,107,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4b91af37-4696-4498-be3e-ae40c4784a6d","listingId":"55eb5da6-d438-4822-b6ec-0a9bba894350","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/keys/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.863Z"}],"sources":[{"listingId":"55eb5da6-d438-4822-b6ec-0a9bba894350","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.863Z","lastSeenAt":"2026-04-22T01:02:19.297Z"}],"details":{"listingId":"55eb5da6-d438-4822-b6ec-0a9bba894350","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/42 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/42"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/42"},{"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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries (metrics, reports, insights) with micropayment settlement on Base","Using utility services like geocoding, validation, and data conversion without subscriptions"],"bestFor":["Agents or bots that need low-friction, keyless API access settled in crypto","Developers prototyping with multiple API categories at minimal per-call cost","Web3-native applications that already hold USDC on Base"],"notFor":["Users who need detailed API documentation, schemas, or SLAs before integrating","High-volume production workloads where $0.02/request adds up and bulk pricing is preferred","Teams that cannot or prefer not to settle payments in cryptocurrency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.146Z"},"updatedAt":"2026-04-22T01:02:19.297Z"}}