{"id":"7866edca-d690-4662-8073-eaa3714a8297","shortId":"R2uHLg","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 exposes a broad collection 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/inbox/150` is listed as \"Premium API Access\" and returns a valid 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 or rate limits required. The platform advertises instant access with a pure pay-per-use model and no minimum commitments.\n\nDocumentation is extremely sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/inbox/150` path specifically (as opposed to the other named endpoints) is unclear; it may be a messaging or notification inbox endpoint, but this is not confirmed by any available 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":["ai","finance","data","utility"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation, OpenAPI spec, or request/response schemas available","The specific endpoint /api/v1/inbox/150 ('Premium API Access') has no description beyond its title — its function is unknown","All secondary pages (/api, /pricing, /README) return only a wallet-connect prompt with no useful content","No examples of expected input or output for any endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/150","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/150","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 documentation, no examples, and the specific purpose of /api/v1/inbox/150 is undocumented. The /api, /pricing, and /README pages are empty wallet-connect stubs.","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":"2026-04-21T21:40:05.175Z","embedding":[-0.023391724,-0.016189575,0.035583496,0.022750854,0.022476196,-0.03488159,-0.016082764,0.036499023,0.06964111,-0.06994629,0.02418518,-0.04788208,-0.020263672,-0.04421997,-0.011306763,0.018463135,-0.002916336,0.009002686,-0.048858643,0.032073975,0.020645142,-0.006034851,-0.024093628,0.038146973,-0.008682251,-0.02909851,-0.012413025,-0.011146545,-0.005744934,-0.048461914,0.05215454,-0.02986145,0.001958847,0.011230469,-0.012680054,-0.0048217773,-0.0025405884,0.037719727,0.020126343,-0.0062332153,-0.022354126,-0.0546875,0.015808105,-0.01637268,-0.056762695,-0.00088119507,0.016311646,-0.0014810562,0.0015134811,0.008895874,-0.029464722,0.0077934265,-0.0010318756,0.002910614,0.021316528,0.011413574,-0.0008711815,0.008163452,0.01826477,0.019439697,0.008018494,-0.052734375,-0.03463745,-0.005744934,-0.0018501282,0.043884277,-0.0036239624,0.052947998,0.0029506683,0.07397461,0.035461426,0.049560547,0.012748718,0.004776001,0.019424438,-0.029418945,-0.0021915436,0.05999756,-0.021148682,-0.0138549805,-0.011054993,-0.00774765,-0.0552063,-0.005935669,-0.023910522,-0.053710938,-0.016723633,0.03387451,-0.03756714,0.019042969,-0.07946777,-0.018692017,-0.022323608,-0.0010509491,0.0003862381,-0.01675415,-0.000096678734,0.010063171,-0.011177063,0.0317688,-0.0054130554,-0.043304443,0.008621216,0.0013446808,0.04559326,0.043823242,0.01687622,0.009994507,0.013473511,-0.0053520203,-0.049865723,0.013671875,-0.025299072,-0.022644043,-0.005306244,0.001367569,-0.0054855347,0.02243042,-0.03250122,0.022262573,-0.03817749,0.049316406,0.0010213852,0.014732361,0.0012969971,-0.07342529,-0.0028877258,-0.0017671585,-0.033966064,-0.004020691,0.016693115,0.017211914,0.022872925,-0.01687622,-0.04928589,-0.0039520264,-0.026977539,-0.006038666,-0.042419434,-0.037109375,0.0309906,-0.033599854,0.016723633,0.032165527,-0.088134766,-0.026168823,-0.043914795,-0.018203735,-0.012611389,-0.010520935,-0.0010194778,0.033203125,-0.026947021,-0.03793335,-0.009925842,-0.013763428,0.008651733,0.027709961,-0.013336182,0.03894043,-0.011550903,0.01008606,0.011367798,-0.016448975,0.0035381317,0.031341553,0.0068626404,-0.09613037,-0.07647705,-0.022033691,0.017623901,-0.02482605,-0.02607727,-0.0017633438,0.0018415451,-0.054260254,-0.025878906,-0.0052452087,0.0016355515,-0.05227661,0.008087158,-0.018463135,0.01689148,-0.015052795,-0.04083252,-0.009841919,-0.013412476,0.05230713,0.017623901,0.031829834,0.031982422,-0.014404297,0.06756592,0.048065186,-0.02532959,-0.030456543,0.022949219,-0.02456665,0.02633667,0.0015974045,0.014587402,-0.028518677,0.030532837,0.07165527,-0.015357971,-0.009353638,-0.0072402954,-0.038024902,-0.048461914,-0.025421143,0.025039673,0.01146698,-0.0030651093,0.039215088,-0.04559326,-0.054779053,-0.025115967,-0.0028076172,0.016479492,0.0597229,0.019195557,0.030929565,0.012680054,0.020812988,-0.030563354,0.03930664,0.02748108,-0.002910614,-0.027496338,-0.014572144,0.026184082,0.029815674,-0.014984131,0.0058174133,-0.000248909,0.03567505,-0.0047416687,0.007255554,0.0236969,-0.006954193,-0.02067566,-0.018859863,-0.013977051,0.019577026,0.008857727,-0.01626587,-0.035583496,-0.07122803,0.034820557,0.035339355,0.052001953,0.0049095154,-0.007160187,-0.027313232,-0.01184082,-0.05267334,0.048675537,0.06573486,0.0014400482,-0.015823364,0.025650024,-0.018554688,-0.02923584,0.0211792,0.0023670197,-0.035003662,-0.00022876263,0.0031414032,-0.053955078,-0.016662598,0.0033931732,0.015571594,0.057617188,-0.0031433105,-0.036987305,-0.02142334,0.0037994385,-0.020339966,-0.024414062,0.007320404,-0.025924683,0.008308411,0.017211914,-0.0065994263,0.020217896,0.0061798096,0.028640747,-0.015014648,0.004135132,-0.024108887,-0.024093628,0.010643005,0.008094788,-0.042999268,0.015701294,-0.01537323,0.07165527,-0.04348755,0.03970337,-0.010406494,0.019866943,0.019210815,0.018310547,-0.05834961,0.007835388,0.027923584,0.028411865,0.060699463,0.017181396,-0.0317688,-0.012260437,0.06939697,-0.019241333,-0.0016565323,0.01374054,-0.008857727,0.020523071,-0.008178711,-0.042755127,-0.041503906,-0.01309967,-0.026535034,0.036102295,-0.018966675,0.02809143,-0.009521484,0.01424408,-0.008041382,-0.003627777,-0.029571533,0.027740479,-0.03387451,0.0047416687,-0.005317688,-0.035339355,0.018585205,0.007247925,-0.00073719025,-0.006439209,0.036499023,0.024276733,-0.0014486313,-0.039886475,-0.028808594,-0.0184021,-0.015609741,0.01940918,0.033813477,0.01914978,0.043914795,-0.033813477,-0.0034942627,0.04360962,0.011245728,0.041381836,0.00022923946,-0.010055542,-0.08215332,-0.05368042,-0.020462036,-0.052764893,0.017196655,0.027191162,0.0017900467,0.041107178,-0.0012493134,-0.033843994,-0.061431885,0.030212402,-0.052703857,0.012466431,0.037902832,-0.014442444,-0.040008545,-0.0033226013,0.005317688,0.012786865,0.031219482,0.0053863525,0.030075073,0.07824707,0.045318604,-0.009521484,0.019760132,0.02330017,0.017654419,0.0102005005,-0.014816284,-0.022888184,0.00033903122,0.033599854,-0.023742676,-0.025848389,-0.06976318,0.06048584,0.03414917,0.07556152,0.021728516,0.02180481,0.031707764,-0.0064353943,-0.0035305023,-0.023590088,-0.027267456,-0.041229248,-0.039855957,0.039367676,-0.019134521,0.007030487,-0.023086548,0.044311523,-0.030426025,0.013885498,-0.020584106,0.041259766,-0.013366699,0.00057029724,0.0155181885,0.00818634,0.061645508,0.058258057,-0.052581787,0.01701355,0.025100708,-0.0259552,0.02078247,0.045318604,-0.016555786,-0.0036373138,-0.066101074,-0.036499023,-0.018875122,-0.010253906,-0.048461914,0.011192322,-0.0068740845,0.013015747,0.041015625,-0.020812988,-0.0030269623,-0.0013217926,-0.024047852,-0.06970215,-0.0009493828,-0.0496521,0.015991211,0.037872314,-0.020965576,-0.019989014,-0.0023822784,-0.005947113,-0.009651184,0.0075531006,0.033813477,-0.0118255615,-0.051483154,0.036071777,-0.0019330978,0.0093307495,0.027877808,0.03994751,0.012283325,0.017349243,0.056854248,0.01322937,-0.021530151,-0.049621582,0.030822754,-0.050323486,0.0093688965,0.012672424,-0.025558472,0.0134887695,0.0051078796,-0.0473938,-0.03173828,0.013420105,-0.012084961,-0.005908966,0.01612854,-0.0236969,-0.031677246,-0.051849365,-0.008308411,-0.0025959015,0.070739746,0.016738892,-0.008666992,-0.048309326,-0.008277893,0.010826111,0.0075798035,0.03390503,-0.014984131,-0.011360168,-0.011795044,-0.029251099,-0.0209198,-0.016433716,0.027557373,0.006668091,-0.0014791489,0.027114868,0.011680603,0.01940918,0.0036811829,-0.0030326843,0.02708435,-0.039642334,-0.009689331,-0.0154418945,0.044128418,0.0062294006,-0.005367279,-0.03451538,0.038085938,0.023132324,0.041259766,-0.018188477,-0.0057029724,-0.0022239685,0.021148682,0.014892578,-0.018585205,-0.0035800934,-0.0018472672,-0.05682373,-0.08569336,0.03692627,-0.017532349,0.01234436,0.017120361,0.011764526,0.017837524,-0.024612427,0.021118164,0.0115356445,-0.023757935,-0.00554657,-0.026229858,-0.01171875,-0.0006365776,-0.011917114,-0.010765076,0.0181427,-0.0059509277,-0.0007343292,-0.0030651093,-0.013412476,0.03555298,0.00018036366,-0.013977051,0.029632568,-0.0038528442,0.02848816,0.036315918,0.009735107,-0.048309326,0.03237915,-0.010757446,0.028518677,-0.012191772,0.05441284,0.039123535,0.011169434,-0.014602661,-0.00440979,-0.023742676,-0.020767212,0.004009247,-0.00035738945,0.024276733,-0.0138549805,-0.057861328,0.019378662,-0.0007991791,-0.037628174,-0.025924683,0.016296387,0.012634277,-0.041931152,0.014724731,0.015777588,0.04800415,-0.022949219,0.020019531,0.008743286,0.03869629,0.04144287,0.0029907227,-0.008605957,0.014266968,0.006427765,0.0061836243,-0.020629883,-0.0012931824,0.02217102,-0.0027275085,0.023849487,0.037261963,0.016616821,-0.025650024,-0.02619934,0.003042221,-0.0138168335,-0.0128479,0.00969696,0.028533936,0.01902771,-0.036895752,0.01007843,0.006801605,-0.020339966,-0.014801025,-0.023895264,0.036224365,0.0013170242,0.0071754456,0.023010254,0.0056610107,0.014297485,-0.037200928,-0.012069702,0.006855011,0.0021820068,-0.018325806,-0.060638428,-0.050872803,0.0029716492,0.017425537,0.007347107,0.02444458,0.031555176,-0.006828308,-0.005756378,0.021392822,0.008621216,-0.023590088,-0.007587433,-0.03338623,-0.014572144,-0.0107803345,0.009490967,-0.03692627,0.02607727,-0.0009784698,-0.028167725,-0.0045814514,-0.008010864,-0.0029525757,-0.010665894,0.006664276,0.045928955,0.0062408447,0.020431519,-0.010353088,-0.02670288,-0.011550903,0.0037708282,0.025344849,-0.043884277,0.02835083,-0.0007481575,-0.003435135,-0.0031280518,0.0042800903,0.008094788,0.018249512,0.014801025,0.027694702,-0.037109375,0.044708252,-0.022155762,0.01928711,0.0010442734,-0.025680542,-0.002714157,-0.02708435,-0.009338379,0.038970947,-0.033172607,-0.031982422,-0.026184082,-0.02885437,-0.010955811,-0.041870117,0.025894165,0.0395813,0.038238525,-0.030776978,0.012191772,0.011329651,0.004753113,-0.008514404,-0.0023059845,0.0012512207,0.0259552,0.019897461,0.008300781,-0.017578125,-0.019226074,-0.022567749,-0.008087158,-0.052612305,-0.05706787,-0.0021400452,0.012275696,-0.0034675598,-0.017150879,-0.031341553,-0.040924072,0.0075187683,-0.040008545,0.015945435,-0.0045700073,0.013870239,0.0040283203,-0.03314209,0.004047394,0.019165039,-0.0072288513,0.028884888,-0.0027179718,-0.004337311,-0.031921387,0.012321472,0.027191162,0.004940033,0.003194809,-0.01864624,-0.0025596619,-0.0340271,-0.058044434,-0.007827759,-0.017730713,-0.0064849854,-0.014419556,0.010627747,-0.054595947,0.005744934,-0.006916046,-0.0075683594,0.020584106,0.011238098,-0.018005371,-0.026473999,0.012771606,-0.006385803,-0.014564514,-0.025939941,0.0070610046,0.011367798,0.007106781,0.03668213,0.05404663,-0.0031166077,-0.026351929,0.027297974,0.004169464,0.008903503,-0.01826477,0.0020771027,-0.027908325,0.0036945343,-0.022323608,-0.013389587,-0.043426514,-0.007949829,0.070617676,0.004173279,0.00078868866,-0.014640808,-0.016906738,0.0021648407,0.028137207,-0.033233643,0.001124382,-0.019760132,0.011581421,-0.026138306,0.02708435,0.003929138,0.031219482,-0.017364502,-0.03945923,-0.0055389404,0.00018429756,-0.00095653534,-0.06591797,-0.02142334,-0.06262207,0.016845703,-0.011695862,-0.03491211,-0.0016765594,0.0082473755,-0.011604309,-0.08648682,0.003042221,0.04864502,-0.0021133423,0.032928467,-0.00667572,0.015960693,0.013221741,-0.01776123,0.004924774,0.018692017,-0.034301758,-0.019180298,-0.010307312,0.027954102,0.006252289,-0.013389587,0.011711121,0.0059280396,0.02130127,-0.016189575,0.020614624,-0.004863739,0.025268555,-0.030685425,0.01486969,-0.016937256,-0.016235352,0.03366089,-0.05718994,0.021636963,0.012413025,-0.009994507,-0.007446289,0.022354126,0.044677734,-0.026443481,-0.029891968,0.0046691895,-0.004283905,0.018875122,-0.020111084,0.051208496,0.0031375885,-0.016403198,0.01687622,-0.001914978,-0.008972168,-0.029556274,-0.034332275,0.018234253,-0.009933472,0.0074539185,-0.0017652512,-0.00687027,0.010749817,-0.0042877197,0.007080078,-0.0078125,-0.021224976,-0.014678955,-0.0061798096,-0.0030059814,0.008934021,0.006477356,0.025177002,0.036743164,0.025054932,-0.00014901161,-0.01474762,-0.00027537346,0.030563354,-0.00052928925,0.008041382,0.02633667,0.02583313,0.015068054,0.011253357,0.0075416565,-0.037902832,-0.0025691986,-0.01637268,-0.018478394,0.0060310364,-0.024093628,-0.006175995,0.0003466606,-0.001584053,-0.014778137,-0.030960083,0.0044441223,-0.031463623,-0.02116394,-0.0059547424,-0.003364563,0.022720337,-0.004737854,-0.00066041946,0.013038635,-0.0044937134,0.036102295,-0.009094238,-0.029067993,0.02470398,0.025665283,0.023040771,-0.041107178,-0.017745972,0.0023269653,0.0005893707,0.0015735626,-0.03201294,0.007472992,0.038909912,-0.009666443,0.017211914,-0.017425537,0.0385437,-0.011856079,0.017242432,-0.016174316,0.017608643,-0.014511108,0.015014648,-0.0362854,0.026473999,0.031707764,0.009498596,-0.015037537,-0.027557373,-0.029144287,0.02986145,0.0065460205,-0.013687134,0.05026245,0.0044937134,0.025726318,-0.02470398,-0.026275635,-0.0077056885,-0.037841797,-0.021087646,0.026641846,0.0056419373,0.010513306,0.013504028,-0.020202637,0.02444458,-0.031036377,0.008361816,0.0035209656,0.0018587112,-0.0072135925,-0.009735107,-0.0056610107,0.013130188,-0.02909851,-0.009643555,-0.005088806,0.05883789,0.024002075,0.043304443,0.033355713,0.0014095306,-0.0012197495,-0.049102783,-0.026123047,0.006008148,-0.026473999,0.019805908,-0.01626587,0.05618286,0.053466797,-0.0028743744,0.030899048,0.044769287,0.041229248,-0.013450623,0.019897461,-0.018661499,0.010543823,-0.011741638,0.027145386,-0.0055656433,0.040771484,-0.032440186,0.024856567,0.0362854,0.012329102,-0.021743774,0.031555176,0.06262207,0.01727295,0.009521484,0.008918762,-0.0051116943,-0.0068359375,-0.0019283295,-0.027770996,0.04562378,0.008705139,0.06652832,0.037261963,0.003458023,-0.00894928,0.0231781,-0.030456543,-0.014694214,0.053771973,0.0121536255,-0.01876831,-0.0099105835,0.0045204163,-0.0013217926,-0.030136108,-0.032958984,0.027313232,-0.008094788,0.0077590942,-0.014480591,0.0012359619,-0.020004272,0.009269714,0.012664795,0.005809784,-0.0043563843,0.0234375,0.02067566,0.011512756,0.03363037,0.0015592575,0.030822754,-0.02154541,-0.023330688,0.020507812,0.009407043,-0.0056419373,0.0005264282,0.029312134,0.003730774,0.03527832,0.034698486,-0.019699097,0.004589081,0.017959595,0.006084442,0.0010404587,0.0791626,0.027923584,0.0096206665,0.028839111,0.028671265,0.02960205,-0.028244019,0.032684326,0.0066604614,0.009605408,-0.0074005127,-0.022659302,-0.004878998,-0.0016736984,0.021850586,-0.0047073364,-0.013725281,-0.00021612644,0.026535034,0.00053453445,-0.0103302,-0.0043792725,0.0059928894,-0.013084412,-0.009132385,0.017181396,-0.021835327,0.02607727,0.0035152435,0.02331543,-0.020706177,0.005180359,-0.0014743805,-0.0137786865,-0.0042877197,0.03125,-0.03414917,0.007827759,0.002035141,-0.009506226,-0.045318604,0.0115356445,0.016448975,-0.018966675,0.025375366,0.01247406,-0.022216797,0.0076141357,0.018875122,0.00014340878,0.012901306,-0.008079529,-0.025848389,0.019958496,0.03866577,0.00440979,0.00484848,-0.03338623,-0.00831604,0.0023956299,-0.013328552,-0.019607544,-0.0031490326,-0.010879517,-0.03945923,0.008712769,0.027389526,0.02607727,0.042144775,-0.017303467,-0.01676941,0.003660202,0.032928467,0.000521183,0.00944519,0.0035514832,0.017044067,-0.01927185,0.04574585,0.05331421,0.012557983,0.041015625,-0.0024795532,0.0026664734,0.0024795532,-0.017105103,0.015449524,-0.038085938,-0.005153656,-0.0028076172,0.026153564,-0.010017395,-0.027954102,0.018676758,-0.014160156,-0.029067993,-0.0064697266,0.015083313,0.0044136047,0.037261963,0.044036865,0.021850586,-0.03604126,0.062683105,-0.017715454,0.042633057,0.0005698204,-0.019714355,0.052825928,0.041229248,0.02571106,0.008743286,0.01499939,-0.04449463,0.0096206665,0.040924072,0.025665283,0.022705078,-0.0070877075,-0.015235901,0.031280518,-0.0068359375,0.01939392,0.0014162064,0.0022029877,0.011352539,-0.011634827,-0.0049858093,-0.0107803345,0.0010309219,-0.0032787323,0.03866577,-0.01625061,-0.009498596,-0.032989502,-0.0132369995,0.03277588,-0.0062294006,-0.009895325,-0.012176514,-0.019744873,0.010543823,-0.02217102,-0.024215698,0.013671875,0.01878357,-0.057037354,-0.008666992,0.016296387,0.0061531067,-0.017852783,0.039794922,0.021530151,-0.010406494,0.016906738,0.033599854,-0.01184082,0.008926392,-0.022781372,0.03286743,0.041534424,0.011177063,-0.015335083,-0.009155273,0.011405945,-0.0104904175,0.011077881,0.03414917,0.008911133,0.0017337799,-0.007408142,-0.008872986,-0.0010480881,0.0021018982,-0.00894928,0.0016746521,-0.012504578,-0.003993988,0.005897522,0.013069153,0.0057640076,0.016708374,-0.022644043,-0.014564514,0.012107849,0.05807495,0.035064697,-0.034698486,-0.006500244,0.0019607544,0.0033740997,-0.018966675,-0.002872467,-0.013801575,-0.03137207,0.013069153,0.023071289,0.008323669,0.019638062,-0.025604248,-0.0029411316,0.024261475,-0.00018322468,0.009292603,0.0044517517,-0.018569946,0.002910614,-0.01737976,-0.0020980835,-0.011810303,-0.0056419373,0.0020713806,0.012916565,0.0068244934,-0.025848389,0.024108887,-0.0040664673,0.013633728,-0.0039634705,0.009063721,0.02319336,0.0027828217,-0.008354187,-0.001783371,0.014854431,-0.011833191,-0.010398865,-0.03010559,0.022659302,0.045959473,-0.0118637085,-0.0031929016,0.02420044,0.020339966,0.02645874,0.050811768,-0.0061531067,0.045715332,0.022232056,-0.016311646,-0.023635864,0.014007568,-0.015174866,-0.028671265,0.022644043,-0.01663208,-0.018753052,0.016448975,0.0016765594,0.0026111603,-0.026565552,-0.010322571,-0.024917603,-0.032806396,0.01838684,-0.0067749023,0.021072388,-0.011497498,-0.007209778,0.0076942444,-0.02180481,-0.057403564,-0.012496948,-0.005214691,-0.008148193,-0.070495605,0.0031013489,-0.03491211,0.013595581,-0.011795044,-0.005027771,-0.023284912,0.029312134,-0.015396118,-0.005012512,0.0010528564,0.020095825,0.030532837,0.012260437,0.022338867,-0.036712646,-0.028884888,-0.01928711,0.016494751,-0.0047073364,0.018035889,0.011329651,0.03488159,-0.001042366,-0.0126571655,0.0073661804,-0.014389038,0.0026416779,-0.02142334,-0.035247803,-0.031173706,0.021331787,0.017532349,-0.0069236755,0.0074386597,0.037506104,-0.021087646,-0.005256653,0.015106201,0.03555298,0.0045318604,0.024337769,-0.020767212,-0.00014340878,-0.024307251,-0.0013198853,-0.02166748,0.0042495728,0.0033035278,0.013328552,-0.025482178,0.02468872,0.03237915,-0.0069007874,-0.006855011,0.019683838,0.0024909973,-0.019073486,0.02885437,0.01058197,0.0027370453,-0.0107421875,-0.0050239563,0.017944336,0.060638428,0.014694214,0.008300781,-0.0001360178,0.007896423,-0.013145447,-0.006439209,0.00009775162,-0.033599854,-0.034332275,-0.014190674,-0.024551392,0.020812988,-0.0026664734,0.0064888,-0.0020198822,0.019515991,-0.0158844,-0.027313232,-0.018051147,0.03111267,-0.004043579,-0.006134033,0.002500534,0.0068969727,0.016189575,-0.018829346,-0.011619568,-0.037994385,-0.048614502,-0.015792847,-0.014564514,0.03704834,0.009742737,-0.019256592,0.0011320114,-0.00233078,0.0059280396,-0.010368347,0.020614624,-0.01751709,0.0021457672,0.008972168,0.013977051,-0.025863647,0.025421143,-0.023086548,-0.005844116,0.0064849854,-0.010307312,0.018295288,-0.0115737915,0.036346436,0.0019664764,-0.0006752014,0.03857422,0.00025057793,0.016525269,-0.027633667,0.010612488,-0.0010251999,-0.019378662,0.038879395,-0.0135269165,-0.011833191,-0.010818481,-0.008651733,-0.0062942505,0.014419556,0.015777588,0.018692017,0.0036334991,0.038269043,-0.019042969,0.003709793,0.023971558,0.014373779,-0.028930664,0.007160187,0.030685425,0.009719849,0.0051002502,-0.006061554,-0.0032577515,-0.029449463,-0.0055389404,0.0039978027,0.0027561188,-0.008346558,0.01537323,-0.0034942627,0.035339355,-0.0012264252,0.001420021,0.016799927,0.017150879,0.040496826,0.010101318,0.027191162,-0.0050811768,-0.020095825,-0.009727478,-0.00087451935,-0.02053833,-0.0019741058,-0.0041236877,0.00052022934,-0.034423828,0.014656067,-0.0061798096,0.026168823,-0.0054016113,0.013900757,-0.030822754,-0.00856781,-0.042175293,-0.0068969727,-0.04711914,0.0054969788,0.032470703,-0.004890442,0.026748657,-0.0036830902,-0.02230835,0.039093018,0.045135498,0.006427765,-0.03265381,-0.021636963,0.00002092123,-0.0039367676,0.010299683,0.0064735413,-0.022003174,-0.021148682,0.0004930496,-0.02999878,0.011047363,-0.019805908,0.018417358,0.010925293,0.0043678284,-0.0034046173,0.015197754,-0.0051460266,-0.013671875,0.0058403015,0.00085783005,0.026367188,0.031677246,-0.0025463104,0.021118164,0.026535034,-0.045776367,0.061584473,-0.0030517578,0.029922485,-0.008262634,0.017181396,-0.03186035,-0.030471802,-0.0065727234,0.002046585],"createdAt":"2026-04-21T18:32:20.306Z","updatedAt":"2026-04-22T02:31:59.159Z","lastSeenAt":"2026-04-22T02:31:59.159Z","tsv":"'/api':181 '/api/v1/inbox/150':112,220 '/pricing':182 '/readme':184 '/request':19,38 '0.02':18,37,95,134 '000':129 '20':128 '402':123 '402 payment api' '6':139 'access':118,163 'across':54 'addit':196 'advertis':161 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,153 'avail':211,248 'base':8,27,103,130,142 'base network api' 'broad':50 'call':4,23 'categori':56 'challeng':124 'classif':71 'classification' 'collect':51 'commit':175 'confirm':245 'connect':192 'content':197 'convers':88 'crawl':214 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':140 'document':176,206,249 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,229,240 'estim':82 'exact':149 'exampl':210 'exchang':77 'export':62 'expos':48 'extrem':178 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'inbox':239 'infrastructur':84 'insight':63 'instant':162 'key':154 'learn':66 'limit':157 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':145 'materi':215 'may':233 'messag':236 'metric':59 'micropayment api' 'minimum':174 'model':171 'name':228 'network':104 'notif':238 'offer':10,29 'openapi':201 'oppos':224 'page':185 'path':221 'pay':2,21,168 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'pay-per-us':167 'payment':143 'per':3,22,96,169 'platform':6,25,46,160 'premium':116 'price':75,93 'prompt':193 'protocol':108 'pure':166 'purpos':217 'quot':80 'rate':78,156 'report':60 'request':97,125 'request/response':204 'requir':158 'resolv':187 'return':120 'schema':205 'scheme':150 'sentiment':67 'sentiment-analysis' 'settl':98 'sinc':136 'spars':179 'spec':202 'specif':110,222 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':231 'unit':131 'usag':209 'usd':135 'usdc':9,28,100,133,137 'usdc api' 'usdc-base' 'use':138,170 'util':15,34,85 'utility-apis' 'valid':87,122 'via':105,146 'wallet':191 'wallet-connect':190 'web3':74 'x402':43,107,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e1570b0d-8068-4554-84d1-ab6c649d3b6f","listingId":"7866edca-d690-4662-8073-eaa3714a8297","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.306Z"}],"sources":[{"listingId":"7866edca-d690-4662-8073-eaa3714a8297","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.306Z","lastSeenAt":"2026-04-22T02:31:59.159Z"}],"details":{"listingId":"7866edca-d690-4662-8073-eaa3714a8297","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/150 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, no minimums, settled on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/inbox/150 endpoint returns a 402 challenge requesting up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/150"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or developers who want zero-signup, pay-per-use API access","Use cases requiring low-cost micropayments settled on Base L2","Projects that need diverse API capabilities (AI, finance, data, utilities) from a single provider"],"notFor":["Users who need detailed API documentation, schemas, or SLAs before integrating","High-volume production workloads where per-request pricing may not be cost-effective compared to subscription APIs","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.274Z"},"updatedAt":"2026-04-22T02:31:59.159Z"}}