{"id":"0fd7f349-0746-4072-b4b5-b1b4a80089e7","shortId":"fkVpFG","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/inbox/52` is listed as \"Premium API Access\" and returns a valid x402 402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The purpose of the `/inbox/52` path specifically (as opposed to the named category endpoints) is unclear; it may be a generic or catch-all premium endpoint. Agents should be aware that without input/output schemas, integration requires experimentation or out-of-band documentation.","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-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no content","The specific purpose and expected input of /api/v1/inbox/52 ('Premium API Access') is unclear — it does not match any of the named category endpoints on the landing page","No example request or response payloads are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/52","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/inbox/52","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no example payloads, and the specific purpose of /api/v1/inbox/52 is undocumented. The landing page lists many endpoints but provides no technical integration details beyond pricing.","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":"2026-04-21T21:46:46.541Z","embedding":[-0.02168274,-0.023162842,0.03692627,0.01852417,0.015342712,-0.033599854,-0.014930725,0.047058105,0.064086914,-0.066711426,0.017700195,-0.044158936,-0.018310547,-0.04043579,-0.0074043274,0.015853882,0.018371582,-0.006576538,-0.04827881,0.035583496,0.015594482,-0.015419006,-0.017028809,0.042907715,-0.005744934,-0.03152466,-0.017089844,-0.0062446594,-0.0046958923,-0.044128418,0.04675293,-0.025466919,0.005016327,0.008911133,-0.021072388,0.0039787292,-0.0043945312,0.047210693,0.019927979,-0.0146865845,-0.014915466,-0.032226562,0.025360107,-0.01864624,-0.058654785,0.0005950928,0.011024475,-0.00982666,0.0077667236,0.012138367,-0.03817749,-0.0004377365,-0.0014181137,0.007331848,0.021942139,0.02319336,-0.0034751892,0.0062942505,0.01361084,0.020141602,-0.0017051697,-0.057922363,-0.03302002,-0.009735107,-0.0061836243,0.04458618,-0.009407043,0.051696777,-0.0009279251,0.074157715,0.035614014,0.04824829,0.012145996,0.00082826614,0.009521484,-0.020965576,0.0021514893,0.058807373,-0.016464233,-0.022415161,-0.018569946,-0.020599365,-0.050933838,-0.017791748,-0.020233154,-0.04626465,-0.0155181885,0.024124146,-0.047027588,0.028884888,-0.08093262,-0.02456665,-0.02418518,0.0052337646,0.010223389,-0.011260986,-0.0040512085,0.012245178,-0.014984131,0.03048706,-0.0041656494,-0.04776001,0.0054740906,-0.004386902,0.05126953,0.041992188,0.025115967,0.021392822,0.012992859,-0.0110321045,-0.05581665,0.014183044,-0.028457642,-0.020507812,-0.0026874542,0.009689331,-0.0073013306,0.019546509,-0.034851074,0.014541626,-0.03527832,0.042175293,0.003545761,0.0155181885,-0.002401352,-0.06427002,-0.010047913,-0.0024604797,-0.030273438,-0.014091492,0.021026611,0.008590698,0.02885437,-0.022644043,-0.050079346,-0.0012722015,-0.016555786,-0.01335144,-0.040252686,-0.03564453,0.041046143,-0.030700684,0.023239136,0.030319214,-0.08557129,-0.024642944,-0.038879395,-0.012001038,-0.010787964,-0.01260376,0.000014066696,0.031082153,-0.026031494,-0.02418518,-0.016998291,-0.021072388,0.010116577,0.023544312,-0.018203735,0.03805542,-0.012741089,0.011169434,0.011245728,-0.017089844,0.007369995,0.02659607,0.0067100525,-0.09692383,-0.07659912,-0.027328491,0.00072813034,-0.031143188,-0.023834229,0.0032157898,0.0011558533,-0.05734253,-0.021392822,-0.0018091202,-0.004207611,-0.041290283,-0.002231598,-0.025802612,0.012130737,-0.017456055,-0.0501709,-0.01663208,-0.0020523071,0.05593872,0.016052246,0.029342651,0.035705566,-0.022598267,0.07019043,0.041625977,-0.026885986,-0.03564453,0.022994995,-0.022262573,0.022262573,0.013954163,0.004386902,-0.036743164,0.03604126,0.076660156,-0.0151901245,-0.0023117065,-0.004928589,-0.0335083,-0.04095459,-0.025466919,0.027297974,-0.0047187805,-0.0009689331,0.031829834,-0.04458618,-0.045318604,-0.02659607,0.0027008057,0.006046295,0.060699463,0.008338928,0.02180481,0.015556335,0.013969421,-0.023422241,0.04647827,0.03881836,-0.0009288788,-0.029891968,-0.016937256,0.03363037,0.026626587,-0.010787964,-0.0014762878,0.00036668777,0.044281006,-0.007019043,0.008026123,0.016906738,-0.0019874573,-0.024795532,-0.032165527,-0.014060974,0.012992859,0.003458023,-0.012123108,-0.03237915,-0.07489014,0.043670654,0.037384033,0.057769775,0.0021686554,-0.0024528503,-0.026168823,-0.00097084045,-0.05319214,0.05496216,0.06378174,0.0007801056,-0.028503418,0.014862061,-0.018737793,-0.022949219,0.028076172,-0.009544373,-0.04147339,-0.009765625,0.013366699,-0.055419922,-0.017791748,0.008491516,0.023971558,0.061401367,-0.008293152,-0.04840088,-0.023132324,0.004272461,-0.016906738,-0.020690918,0.00090169907,-0.026504517,0.008430481,0.020614624,-0.008918762,0.023635864,-0.004299164,0.017074585,-0.018539429,0.01133728,-0.023010254,-0.019439697,0.023803711,0.007987976,-0.04949951,0.0074882507,-0.020736694,0.062347412,-0.039123535,0.035308838,0.0018796921,0.017028809,0.03375244,0.014915466,-0.054656982,0.011009216,0.021896362,0.025650024,0.058685303,0.008071899,-0.034851074,-0.02267456,0.074035645,-0.020523071,-0.0044021606,0.0095825195,-0.003753662,0.021514893,-0.017623901,-0.040740967,-0.029266357,-0.007083893,-0.01965332,0.02923584,-0.02293396,0.028747559,0.0042381287,0.018600464,-0.01007843,0.00041484833,-0.02255249,0.027832031,-0.041290283,-0.0015115738,-0.013442993,-0.020446777,0.022338867,0.0066184998,-0.010818481,-0.0062332153,0.038635254,0.019821167,-0.0184021,-0.04849243,-0.03552246,-0.023132324,-0.014701843,0.021011353,0.04244995,0.016616821,0.050476074,-0.043640137,0.0034503937,0.044769287,0.01386261,0.03729248,0.004322052,-0.00096035004,-0.090026855,-0.051208496,-0.025360107,-0.047546387,0.008262634,0.03503418,-0.00055742264,0.049987793,0.00018310547,-0.03668213,-0.06756592,0.028839111,-0.04925537,0.02494812,0.033203125,-0.009864807,-0.03286743,-0.0030002594,0.0017642975,0.011894226,0.034423828,0.009971619,0.012413025,0.08331299,0.053955078,-0.009277344,0.016143799,0.020233154,0.025314331,0.0053253174,-0.0101623535,-0.022384644,0.0007891655,0.030761719,-0.02684021,-0.024047852,-0.06866455,0.05831909,0.027557373,0.07281494,0.021896362,0.016555786,0.029693604,-0.005153656,-0.006679535,-0.018997192,-0.021759033,-0.039855957,-0.034973145,0.041870117,-0.018569946,0.0033912659,-0.02458191,0.03326416,-0.02822876,0.02557373,-0.023345947,0.03100586,-0.00051784515,0.0036144257,0.018920898,0.0007638931,0.0501709,0.06323242,-0.043273926,0.024047852,0.025817871,-0.03793335,0.00491333,0.05117798,-0.018295288,-0.007797241,-0.06500244,-0.02796936,-0.010612488,-0.007091522,-0.04916382,-0.00014138222,-0.004886627,0.015686035,0.036102295,-0.016921997,-0.0061035156,-0.009185791,-0.026763916,-0.06323242,-0.0032424927,-0.04724121,0.01725769,0.03955078,-0.030792236,-0.016693115,-0.009941101,-0.019683838,-0.011604309,0.005191803,0.035125732,-0.01512146,-0.05291748,0.035614014,0.006160736,0.008666992,0.024246216,0.039886475,0.013442993,0.02708435,0.046691895,0.000875473,-0.015792847,-0.048614502,0.026107788,-0.05432129,0.017944336,0.026809692,-0.024169922,0.0076026917,-0.0041122437,-0.042053223,-0.035369873,0.011505127,-0.012672424,-0.009269714,0.0155181885,-0.018066406,-0.02281189,-0.048461914,-0.017700195,0.0046081543,0.070495605,0.016296387,-0.015716553,-0.050750732,-0.008285522,0.016738892,0.00982666,0.027435303,-0.015777588,-0.013053894,-0.010322571,-0.03164673,-0.02168274,-0.0096206665,0.028213501,0.0075416565,-0.011947632,0.03805542,0.011924744,0.022369385,0.008720398,0.0014381409,0.020736694,-0.037841797,-0.01108551,-0.011512756,0.036346436,0.008651733,-0.011749268,-0.044036865,0.03540039,0.019241333,0.042663574,-0.020706177,-0.011039734,-0.0030078888,0.021148682,0.015350342,-0.018737793,-0.011207581,0.001537323,-0.05630493,-0.07763672,0.029434204,-0.024368286,0.021881104,0.011131287,0.0051841736,0.01600647,-0.018463135,0.016418457,0.010513306,-0.027236938,-0.0076560974,-0.031463623,-0.02947998,-0.0046463013,-0.010215759,-0.018569946,0.020889282,-0.011070251,0.0158844,0.0013380051,-0.01928711,0.025878906,-0.0020103455,-0.0032444,0.03387451,-0.004852295,0.026565552,0.036132812,0.008026123,-0.04284668,0.028503418,-0.010414124,0.016601562,-0.012863159,0.04824829,0.037475586,0.013404846,-0.017089844,-0.005935669,-0.018539429,-0.02368164,0.00756073,-0.0013971329,0.016845703,-0.014724731,-0.05630493,0.0115356445,0.005378723,-0.03677368,-0.03857422,0.010147095,0.016174316,-0.044525146,0.012672424,0.016342163,0.04751587,-0.024505615,0.022262573,0.012390137,0.03390503,0.04534912,0.00085783005,-0.01399231,0.0076904297,0.006904602,0.013549805,-0.010169983,0.0014047623,0.013725281,0.00016498566,0.026977539,0.040405273,0.01638794,-0.020309448,-0.028457642,0.0071525574,-0.018539429,-0.0116119385,0.011940002,0.028961182,0.020767212,-0.032043457,0.013175964,0.004886627,-0.012588501,-0.019104004,-0.01953125,0.030349731,-0.004047394,-0.0057792664,0.024047852,0.004085541,0.015312195,-0.034454346,-0.006038666,0.008460999,0.0018138885,-0.016403198,-0.04849243,-0.052215576,0.0024490356,0.017028809,0.010131836,0.02330017,0.020767212,-0.008148193,-0.009048462,0.014160156,0.0095825195,-0.028366089,-0.006652832,-0.04034424,-0.012062073,-0.0088272095,0.009971619,-0.035949707,0.015960693,0.0030899048,-0.02798462,-0.006385803,-0.0021591187,-0.00020647049,-0.012138367,0.0016956329,0.048797607,0.0026817322,0.022262573,-0.013214111,-0.026977539,-0.007331848,-0.000036001205,0.025115967,-0.054382324,0.019302368,-0.0023040771,-0.0034236908,0.0016860962,0.015571594,0.008178711,0.024597168,0.014183044,0.02659607,-0.042053223,0.0519104,-0.019515991,0.020492554,0.0029754639,-0.030975342,-0.010032654,-0.021911621,-0.007843018,0.040802002,-0.028366089,-0.035064697,-0.024368286,-0.031188965,-0.005466461,-0.044189453,0.028213501,0.034301758,0.036254883,-0.031799316,0.011810303,0.011695862,0.0070228577,-0.017211914,-0.011604309,0.0068626404,0.018203735,0.027709961,0.0039901733,-0.02418518,-0.015106201,-0.025375366,-0.004573822,-0.055114746,-0.05895996,-0.013381958,0.0069351196,0.002784729,-0.011787415,-0.035247803,-0.039245605,0.007972717,-0.04248047,0.015472412,-0.0138168335,0.016098022,0.005718231,-0.02772522,-0.003921509,0.01512146,-0.008712769,0.029449463,0.0020313263,-0.0018968582,-0.03479004,0.013694763,0.016448975,0.014785767,-0.0045776367,-0.019638062,-0.00020265579,-0.028045654,-0.057006836,-0.0073509216,-0.018875122,-0.008399963,-0.020523071,0.009315491,-0.054107666,0.005607605,-0.008491516,-0.01737976,0.019165039,0.005130768,-0.015083313,-0.023132324,0.018066406,-0.0042152405,-0.019561768,-0.018951416,0.016143799,0.012069702,0.006538391,0.030212402,0.05419922,0.0005326271,-0.030380249,0.021011353,0.008560181,0.012756348,-0.023361206,0.006515503,-0.02420044,0.008651733,-0.018218994,-0.013519287,-0.036254883,-0.00223732,0.07897949,0.009208679,0.0009279251,-0.023345947,-0.016952515,0.012512207,0.031799316,-0.04336548,-0.0035095215,-0.030212402,0.008720398,-0.0317688,0.027709961,0.0048179626,0.023986816,-0.015960693,-0.047546387,-0.008407593,-0.0037708282,-0.00274086,-0.058532715,-0.0107421875,-0.06463623,0.0119018555,-0.01776123,-0.040496826,-0.001786232,0.011833191,-0.015945435,-0.08795166,0.003063202,0.05078125,-0.0057411194,0.032470703,-0.014472961,0.011802673,0.014671326,-0.016937256,0.0053863525,0.024490356,-0.03555298,-0.01890564,-0.00894165,0.031982422,0.0010652542,-0.01222229,0.018325806,-0.0073928833,0.019119263,-0.011039734,0.022949219,-0.015029907,0.032562256,-0.023483276,0.0135269165,-0.013519287,-0.014167786,0.03237915,-0.05038452,0.020111084,0.014564514,-0.011199951,-0.00074243546,0.021636963,0.045013428,-0.02746582,-0.026229858,0.012069702,0.005935669,0.025726318,-0.017456055,0.044708252,0.004634857,-0.020935059,0.017669678,0.002664566,-0.008514404,-0.034088135,-0.03414917,0.022384644,-0.009300232,0.009086609,-0.016342163,-0.0011892319,0.014442444,-0.0036506653,0.017990112,-0.004207611,-0.02545166,-0.014305115,-0.004383087,0.0015468597,0.014289856,0.0019483566,0.03390503,0.023742676,0.026245117,-0.008972168,-0.01361084,-0.0018701553,0.02986145,0.0058898926,0.004714966,0.02947998,0.02268982,0.005256653,0.009223938,0.0010995865,-0.040924072,-0.0041542053,-0.018295288,-0.012245178,0.004322052,-0.02067566,-0.007446289,0.0011730194,0.0020637512,-0.02293396,-0.031143188,0.005783081,-0.030731201,-0.022399902,-0.007827759,0.00014138222,0.02885437,0.0060691833,0.007987976,0.0090789795,0.0010356903,0.03945923,0.0013055801,-0.025161743,0.020065308,0.02229309,0.01689148,-0.039276123,-0.016433716,0.0047683716,0.011558533,-0.002363205,-0.03161621,-0.000032544136,0.039611816,-0.016723633,0.009208679,-0.0066184998,0.037078857,-0.01235199,0.016677856,-0.009490967,0.0066490173,-0.008880615,0.011154175,-0.03265381,0.018814087,0.028945923,0.0011205673,-0.017242432,-0.022277832,-0.026367188,0.029891968,0.0079574585,-0.011512756,0.050323486,0.009689331,0.029266357,-0.019714355,-0.011383057,-0.0015821457,-0.03765869,-0.021636963,0.027389526,0.0033035278,0.0067977905,0.014724731,-0.024291992,0.02281189,-0.031677246,0.014167786,0.004371643,-0.0019483566,-0.009147644,-0.015098572,-0.011634827,0.011741638,-0.03010559,-0.005470276,-0.0024318695,0.06201172,0.020690918,0.048675537,0.037597656,-0.00063562393,-0.005393982,-0.04663086,-0.034088135,-0.0025806427,-0.015808105,0.009170532,-0.020126343,0.05203247,0.048706055,-0.007160187,0.024841309,0.049865723,0.042053223,-0.0079422,0.014717102,-0.0256958,0.0036315918,-0.0037441254,0.018600464,0.005405426,0.044128418,-0.032409668,0.020584106,0.03366089,0.015556335,-0.016159058,0.030059814,0.062805176,0.014472961,0.012710571,0.012557983,-0.0032520294,-0.008224487,0.0012102127,-0.02861023,0.04055786,0.0070724487,0.064697266,0.037078857,0.011260986,-0.006111145,0.02671814,-0.031311035,-0.019302368,0.051086426,0.021011353,-0.018539429,-0.010475159,-0.003211975,0.0067100525,-0.049804688,-0.028121948,0.022766113,0.0008254051,0.0109939575,-0.009613037,-0.0014095306,-0.009925842,0.007835388,0.01423645,0.010360718,0.009384155,0.028213501,0.023361206,0.009254456,0.039398193,0.0041618347,0.034057617,-0.02734375,-0.030654907,0.022888184,0.012908936,-0.0023860931,-0.0035629272,0.030548096,0.00029945374,0.034423828,0.033935547,-0.023529053,0.008903503,0.018417358,0.0016555786,0.0078125,0.07647705,0.020706177,0.0076560974,0.027145386,0.033111572,0.033111572,-0.017990112,0.025238037,-0.002155304,0.01663208,-0.008026123,-0.025848389,0.0005888939,0.006832123,0.014945984,-0.0040130615,-0.021026611,-0.0013637543,0.018661499,-0.00009906292,-0.0062713623,-0.00522995,0.008987427,-0.014282227,-0.004009247,0.016052246,-0.01927185,0.03253174,0.0048828125,0.024398804,-0.010108948,0.009544373,-0.006259918,-0.021072388,-0.0046653748,0.03237915,-0.034576416,0.012229919,0.000027358532,-0.012367249,-0.050933838,0.016204834,0.018066406,-0.017364502,0.023208618,0.009307861,-0.022262573,0.013114929,0.018829346,0.0007901192,0.007736206,-0.000110924244,-0.024734497,0.031463623,0.046813965,0.00283432,0.013801575,-0.023590088,-0.008407593,0.0018291473,-0.0072746277,-0.010261536,-0.008522034,-0.011390686,-0.03543091,0.01689148,0.02645874,0.024383545,0.036834717,-0.017410278,-0.019744873,0.000746727,0.026168823,0.009689331,0.0072135925,-0.005519867,0.019729614,-0.01966858,0.03982544,0.052703857,0.015029907,0.04727173,-0.0051879883,0.0035095215,0.0060653687,-0.017364502,0.008392334,-0.03149414,0.0011014938,-0.008346558,0.030929565,-0.019958496,-0.032714844,0.013954163,-0.013648987,-0.03062439,-0.009185791,0.016784668,-0.0036411285,0.043884277,0.036376953,0.019729614,-0.0418396,0.06555176,-0.023071289,0.03857422,-0.000057041645,-0.010658264,0.050964355,0.03643799,0.026016235,0.01247406,0.013511658,-0.04055786,0.012489319,0.03857422,0.019378662,0.018737793,-0.0016975403,-0.011650085,0.034606934,-0.005214691,0.022155762,-0.008140564,-0.0013513565,0.00856781,-0.008712769,-0.0031852722,-0.004787445,0.003255844,-0.0023498535,0.033233643,-0.022232056,-0.009338379,-0.030349731,-0.015434265,0.040649414,-0.009056091,-0.014389038,-0.012771606,-0.02394104,0.0064888,-0.01828003,-0.017181396,0.014671326,0.015419006,-0.050231934,-0.016952515,0.018508911,0.007911682,-0.017959595,0.04598999,0.018600464,-0.010284424,0.011451721,0.035705566,-0.013893127,0.012664795,-0.028579712,0.027404785,0.052215576,0.014045715,-0.0049324036,-0.0040779114,0.0055656433,-0.011291504,0.014228821,0.031585693,0.006801605,0.0021133423,-0.011978149,-0.0052490234,-0.0015649796,0.0011692047,-0.007888794,0.00869751,-0.013755798,-0.010124207,0.009033203,0.016586304,0.003835678,0.015106201,-0.027877808,-0.016281128,0.009262085,0.05810547,0.026977539,-0.032470703,-0.009765625,-0.0010824203,0.009880066,-0.027709961,-0.0028934479,-0.0077323914,-0.03152466,0.022827148,0.023422241,0.0063934326,0.022094727,-0.017410278,-0.0030345917,0.024230957,0.0032196045,0.008323669,0.0041885376,-0.018203735,0.004360199,-0.011810303,-0.0024299622,-0.021759033,0.00042271614,-0.0014762878,0.014755249,-0.0018491745,-0.025115967,0.03277588,-0.009216309,0.013290405,-0.0047035217,0.0063476562,0.013671875,0.0016717911,-0.011962891,-0.0021705627,0.01928711,-0.012069702,-0.010116577,-0.024490356,0.015991211,0.04675293,-0.010116577,-0.005203247,0.027160645,0.023513794,0.03326416,0.047943115,0.0015926361,0.044891357,0.018630981,-0.023422241,-0.026809692,0.012825012,-0.005092621,-0.025894165,0.017181396,-0.004951477,-0.023071289,0.017837524,0.009346008,0.001627922,-0.02268982,-0.01361084,-0.028152466,-0.033691406,0.013938904,-0.0032520294,0.01550293,-0.00970459,-0.007221222,0.005859375,-0.02758789,-0.05038452,-0.008224487,0.004322052,-0.0104904175,-0.07098389,0.00083875656,-0.03765869,0.015029907,-0.012306213,-0.005367279,-0.027267456,0.025878906,-0.008300781,-0.0059280396,-0.0021705627,0.017196655,0.023864746,0.016143799,0.022659302,-0.033477783,-0.034820557,-0.018920898,0.008056641,-0.014160156,0.018417358,0.0022411346,0.030654907,0.0061302185,-0.009788513,0.008255005,-0.011749268,0.0012617111,-0.016235352,-0.029953003,-0.028457642,0.021942139,0.014846802,-0.004837036,0.0054969788,0.035583496,-0.012062073,0.0015325546,0.014633179,0.031311035,0.0052948,0.016799927,-0.016662598,-0.0039520264,-0.019714355,0.000026524067,-0.018447876,0.0104599,0.0011463165,0.0069503784,-0.019104004,0.013755798,0.03945923,-0.00491333,-0.0055503845,0.02217102,0.0035896301,-0.016433716,0.027114868,0.011627197,-0.00434494,-0.01953125,-0.010154724,0.022659302,0.059570312,0.019470215,0.010284424,-0.0059165955,0.007911682,-0.010978699,-0.0060768127,0.0075950623,-0.03527832,-0.030075073,-0.015686035,-0.023223877,0.012863159,0.0034561157,0.009361267,-0.0046920776,0.020126343,-0.008682251,-0.027374268,-0.018997192,0.025558472,-0.0052833557,-0.0012044907,0.0011758804,0.0068206787,0.016494751,-0.021209717,-0.010810852,-0.036468506,-0.05142212,-0.007926941,-0.008094788,0.021621704,0.013183594,-0.017303467,0.006095886,-0.0011816025,0.006969452,-0.013694763,0.020614624,-0.022140503,0.002073288,0.015258789,0.010871887,-0.020111084,0.027313232,-0.018936157,-0.01373291,0.011100769,-0.0015535355,0.015327454,-0.008392334,0.042938232,0.002937317,0.0029182434,0.033813477,0.00039243698,0.007297516,-0.02758789,0.015052795,-0.0036754608,-0.010444641,0.03955078,-0.01020813,-0.015098572,-0.008178711,-0.010269165,-0.017608643,0.015838623,0.01914978,0.022583008,-0.00605011,0.049316406,-0.018539429,0.002254486,0.022903442,0.018447876,-0.028564453,0.008682251,0.032562256,0.0025424957,0.00062704086,-0.008918762,-0.0031394958,-0.034851074,-0.0028953552,0.007446289,0.004135132,-0.003446579,0.029434204,0.0022716522,0.040130615,-0.000626564,0.002784729,0.0155181885,0.01007843,0.03213501,0.009376526,0.031219482,-0.011054993,-0.021636963,-0.006134033,0.0012578964,-0.02609253,-0.0024471283,-0.0009756088,0.0039749146,-0.046020508,0.014526367,-0.0011663437,0.032348633,-0.011581421,0.018554688,-0.031066895,0.005466461,-0.0446167,-0.014579773,-0.036193848,-0.000027954578,0.03253174,-0.0008497238,0.029678345,-0.006954193,-0.0259552,0.027618408,0.04031372,0.013114929,-0.029922485,-0.017242432,0.0050201416,-0.0042686462,0.011856079,0.000934124,-0.01965332,-0.026138306,-0.0014724731,-0.018661499,0.005756378,-0.0098724365,0.009765625,0.012214661,0.0027828217,-0.007980347,0.016555786,-0.0071411133,-0.009689331,0.008239746,0.0015106201,0.025878906,0.023025513,-0.0146865845,0.019607544,0.027297974,-0.04284668,0.05819702,-0.0034370422,0.035491943,-0.013114929,0.021026611,-0.03805542,-0.033172607,-0.0129776,-0.0029239655],"createdAt":"2026-04-21T18:32:21.998Z","updatedAt":"2026-04-22T05:32:10.430Z","lastSeenAt":"2026-04-22T05:32:10.430Z","tsv":"'/api':184 '/api/v1/inbox/52':123 '/inbox/52':220 '/pricing':185 '/readme':187 '/request':19,38 '0.02':18,37,95,152 '000':142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '0x8335':147 '20':141 '402':135 '402 payment api' '6':156 'accept':170 'access':129 'across':54 'addit':199 'address':162 'agent':243 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,128 'application/json':175 'avail':215 'awar':246 'band':258 'base':8,27,103,143,149 'base network api' 'beyond':177 'broad':50 'call':4,23 'catch':239 'catch-al':238 'categori':56,228 'challeng':136 'cheap api' 'classif':71 'classification' 'commit':118 'connect':195 'convers':88 'cover':10,29 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':157 'detail':201 'document':176,210,259 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,169,229,242 'equal':151 'estim':82 'exact':166 'exampl':213 'exchang':77 'experiment':253 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'generic':236 'geocod':86 'geocoding' 'given':153 'http':171 'infrastructur':84 'input/output':249 'insight':63 'integr':251 'key':111 'land':179 'learn':66 'limit':114 'list':125 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'marketplac':46 'maxamountrequir':139 'may':233 'metric':59 'micropayment api' 'name':227 'network':104 'openapi':205 'oppos':224 'out-of-band':255 'page':180 'path':221 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payload':214 'payment':158 'per':3,22,96 'platform':6,25 'post':172 'premium':127,241 'price':75,93 'prompt':196 'protocol':108 'purpos':217 'quot':80 'rate':78,113 'report':60 'request':97 'request/response':208 'requir':252 'resolv':190 'return':131,174 'rout':188 'schema':209,250 'scheme':167 'sent':160 'sentiment':67 'sentiment-analysis' 'set':51 'spars':182 'spec':206 'specif':120,222 'summar':70 'technic':200 'text':69 'text-summarization' 'token':79 'unclear':231 'unit':144 'upfront':117 'usdc':9,28,100,146,154 'usdc api' 'usdc-base' 'use':164 'util':15,34,85 'utility-apis' 'valid':87,133 'via':105 'wallet':194 'wallet-connect':193 'web3':74 'without':248 'x402':43,107,134 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"852f6f8f-71c1-4032-9c08-6f973f8ffc71","listingId":"0fd7f349-0746-4072-b4b5-b1b4a80089e7","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/inbox/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.998Z"}],"sources":[{"listingId":"0fd7f349-0746-4072-b4b5-b1b4a80089e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.998Z","lastSeenAt":"2026-04-22T05:32:10.430Z"}],"details":{"listingId":"0fd7f349-0746-4072-b4b5-b1b4a80089e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/52 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/52 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/52"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding and data validation as a utility service with no subscription","Exporting analytics data or generating reports on a per-request basis","Web3-native applications that want to pay for API calls in USDC on Base"],"bestFor":["AI agents that need keyless, pay-as-you-go access to diverse API categories","Developers prototyping with low-cost, no-commitment API calls","Web3 applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integration","Teams that cannot transact in USDC on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.036Z"},"updatedAt":"2026-04-22T05:32:10.430Z"}}