{"id":"18c2e6d1-94f4-4293-ae26-d258c466801e","shortId":"FQZ3Yb","kind":"x402","title":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints secured via the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/3` is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's advertised flat pricing.\n\nThe broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The `/api/v1/charges/3` endpoint itself does not clearly map to any of the named API categories on the landing page, so its actual functionality is unknown beyond the \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","search","geo","finance"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","premium api access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content.","No OpenAPI or request/response schema provided for any endpoint.","The endpoint path /api/v1/charges/3 does not correspond to any named API on the landing page; its actual functionality is unknown.","Cannot verify that the advertised AI, analytics, finance, or utility endpoints are actually functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/3","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/charges/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The specific function of /api/v1/charges/3 is unclear. This is 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":"2026-04-19T03:45:44.412Z","embedding":[-0.016174316,-0.03869629,0.048980713,-0.00088596344,0.023117065,-0.01928711,-0.030303955,0.026000977,0.068603516,-0.06726074,0.037200928,-0.05706787,-0.027389526,-0.02961731,-0.020339966,0.013893127,-0.005458832,0.0055885315,-0.055511475,0.041656494,0.024673462,-0.005458832,-0.012397766,0.026306152,-0.008216858,-0.02406311,-0.0026988983,-0.0041236877,-0.018081665,-0.03652954,0.028320312,-0.027877808,-0.0018787384,0.0034179688,-0.009811401,-0.015823364,-0.015296936,0.038848877,0.032989502,-0.013336182,-0.0003015995,-0.049835205,0.009063721,-0.009719849,-0.056030273,-0.018188477,0.022628784,-0.020492554,-0.006298065,0.008102417,-0.03100586,0.003982544,-0.014785767,0.013328552,0.0019683838,0.0184021,-0.012130737,-0.013542175,0.010025024,-0.01159668,-0.0049743652,-0.06549072,-0.02281189,0.012435913,-0.0016260147,0.06298828,-0.013381958,0.05130005,0.002609253,0.05203247,0.030578613,0.052459717,0.040985107,-0.0016880035,0.014862061,-0.015380859,-0.014389038,0.05130005,-0.018478394,-0.015541077,-0.01890564,0.0027618408,-0.058685303,-0.0090408325,-0.013076782,-0.059570312,-0.018249512,0.027008057,-0.04135132,0.021392822,-0.076171875,-0.008903503,-0.015556335,-0.006084442,0.0006952286,0.01247406,-0.006893158,0.012878418,-0.006679535,0.012565613,-0.0071144104,-0.036346436,0.014457703,0.023605347,0.03152466,0.04638672,0.029266357,0.025512695,-0.005050659,-0.02357483,-0.033172607,0.0104599,-0.02041626,-0.013938904,0.005958557,0.014793396,-0.02557373,0.03161621,-0.031143188,0.0067825317,-0.04837036,0.05718994,0.03555298,-0.0040740967,0.013313293,-0.049926758,-0.022476196,0.001748085,-0.039611816,-0.017578125,0.021881104,0.011657715,0.03466797,-0.039215088,-0.020401001,-0.0068626404,-0.00944519,-0.019744873,-0.052642822,-0.019592285,0.041137695,-0.022506714,0.034362793,0.030334473,-0.099121094,-0.004760742,-0.031463623,0.0023326874,-0.02607727,-0.0072746277,-0.00233078,0.023635864,-0.03137207,-0.024246216,-0.013656616,-0.024047852,-0.0070533752,0.032104492,-0.0024719238,0.033996582,-0.020950317,0.014457703,-0.0019760132,-0.0036182404,0.016906738,0.021347046,0.0026760101,-0.0848999,-0.08129883,-0.03729248,-0.02331543,-0.016845703,-0.027328491,-0.015701294,0.007709503,-0.08294678,-0.011436462,-0.0063591003,-0.0013036728,-0.03010559,0.00011074543,-0.025146484,0.011680603,-0.009681702,-0.054229736,-0.010246277,-0.018539429,0.064208984,0.027069092,0.03567505,0.026138306,0.0012130737,0.06137085,0.021347046,-0.024490356,-0.020385742,0.018157959,-0.0061302185,0.03527832,-0.005027771,0.013008118,-0.020111084,0.060913086,0.06512451,0.005077362,-0.02229309,-0.007736206,-0.06335449,-0.047546387,-0.046875,0.012535095,0.007965088,-0.010864258,0.05130005,-0.039367676,-0.03591919,-0.014633179,0.0020484924,0.010528564,0.06213379,0.020858765,-0.0010299683,0.018722534,0.003610611,-0.045013428,0.039001465,0.032714844,0.010276794,-0.021102905,-0.02986145,0.035461426,0.023880005,-0.033843994,0.017074585,-0.026885986,0.013511658,0.00069761276,0.013557434,0.02494812,-0.0074272156,-0.025848389,-0.016098022,-0.015411377,0.024261475,0.01512146,-0.03237915,-0.03781128,-0.07458496,0.045898438,0.030273438,0.035125732,-0.0033016205,0.015960693,-0.01600647,-0.013427734,-0.0713501,0.056915283,0.082092285,0.0035266876,-0.02720642,0.018096924,0.0011062622,-0.030685425,0.0034370422,-0.0030078888,-0.0234375,-0.010169983,0.017166138,-0.03930664,0.010238647,0.023239136,0.029342651,0.06286621,-0.023086548,-0.062286377,-0.02368164,0.00071668625,-0.00029492378,-0.026931763,0.0095825195,-0.011482239,0.029083252,0.032714844,0.007865906,0.02520752,0.0011978149,0.014404297,-0.00018310547,-0.0051841736,-0.01689148,-0.022857666,0.010429382,-0.008468628,-0.07305908,0.021133423,-0.0035877228,0.06347656,-0.04989624,0.039978027,-0.0041275024,0.012298584,0.054229736,-0.009719849,-0.043701172,0.012435913,0.02545166,0.026641846,0.03665161,0.01436615,-0.01360321,0.0004043579,0.07171631,-0.00029039383,-0.0022659302,-0.0033912659,0.010772705,0.036254883,-0.007972717,-0.05770874,-0.0418396,-0.01436615,-0.031585693,0.027374268,-0.028808594,0.01689148,-0.013137817,0.013755798,-0.0064735413,-0.0017766953,-0.039978027,0.007751465,-0.017715454,0.011077881,-0.018157959,-0.033325195,0.008056641,0.023712158,-0.019332886,0.0024986267,0.045776367,0.018997192,-0.029510498,-0.04156494,-0.025466919,-0.013633728,-0.0044174194,0.015312195,0.012550354,0.021408081,0.048980713,-0.034362793,0.004878998,0.015838623,0.0096206665,0.034942627,-0.009246826,-0.012107849,-0.058532715,-0.04272461,-0.025436401,-0.032470703,0.026260376,0.032592773,0.0031166077,0.048095703,-0.0050964355,-0.026611328,-0.025604248,0.018875122,-0.04031372,0.011688232,0.030685425,-0.010154724,-0.056030273,-0.0050315857,-0.0055389404,0.0033130646,0.04208374,0.013221741,0.003396988,0.06201172,0.026748657,0.008636475,0.01550293,0.020874023,0.023071289,0.0018005371,-0.023712158,-0.016540527,-0.0054512024,0.030685425,-0.02909851,-0.032714844,-0.064697266,0.048858643,0.021835327,0.068359375,0.009925842,0.013931274,0.033477783,-0.0095825195,0.022201538,-0.023025513,-0.020767212,-0.030838013,-0.027023315,0.041381836,-0.01701355,-0.009048462,-0.034484863,0.052368164,-0.0025291443,0.011413574,-0.034820557,0.054748535,-0.012290955,-0.00017344952,0.010810852,0.01008606,0.05392456,0.06365967,-0.058441162,0.022399902,0.026153564,-0.028839111,0.0053367615,0.053863525,-0.014732361,-0.017501831,-0.07434082,-0.02357483,0.009407043,-0.01360321,-0.05529785,0.0041923523,0.0052108765,0.022338867,0.022384644,-0.0076560974,-0.023345947,0.0050315857,-0.026519775,-0.055023193,-0.0032539368,-0.049346924,-0.001572609,0.031402588,-0.035095215,0.0014419556,-0.011932373,-0.007335663,-0.013130188,0.0057258606,0.027252197,-0.0063171387,-0.05609131,0.045440674,0.0051193237,0.010635376,0.02229309,0.04159546,0.049346924,0.013702393,0.05419922,0.0047798157,-0.028259277,-0.05227661,0.022140503,-0.040740967,0.0040740967,0.014320374,-0.023086548,-0.00111866,-0.011665344,-0.034332275,-0.027618408,-0.0002667904,-0.03503418,0.0044403076,0.012176514,-0.040283203,-0.034484863,-0.056030273,-0.012649536,-0.00459671,0.082214355,0.020751953,0.000075280666,-0.055023193,-0.0067863464,0.02331543,0.0032367706,0.024429321,-0.015838623,-0.022201538,-0.006965637,-0.04699707,-0.006008148,-0.021316528,0.029785156,-0.0049476624,-0.022598267,0.026428223,-0.0024662018,0.005756378,-0.010101318,0.0028686523,0.02822876,-0.028457642,-0.0087890625,-0.026824951,0.016647339,0.0066337585,0.0003194809,-0.0491333,0.050842285,0.022354126,0.044799805,-0.03262329,0.0023841858,-0.008522034,0.005207062,0.030029297,-0.017440796,-0.00007909536,-0.013664246,-0.044525146,-0.050811768,0.025238037,-0.024673462,0.032104492,0.0019607544,-0.0035533905,0.033569336,-0.023010254,0.020629883,0.020767212,-0.025909424,0.004863739,-0.018600464,-0.028152466,-0.011619568,-0.00071907043,-0.022827148,0.026672363,-0.017318726,0.010009766,-0.014183044,-0.023422241,0.034301758,0.016830444,0.0015964508,0.027252197,-0.003353119,0.01612854,0.05557251,0.0102005005,-0.04071045,0.030548096,-0.005138397,0.008872986,-0.012527466,0.043914795,0.03579712,-0.010116577,-0.010482788,-0.00630188,-0.014732361,-0.021102905,-0.00818634,0.016799927,0.018203735,-0.001074791,-0.045196533,0.012451172,0.012161255,-0.020614624,-0.007972717,0.012825012,0.021881104,-0.038757324,0.020401001,0.023834229,0.060394287,-0.0317688,-0.001449585,0.017578125,0.034240723,0.027252197,0.016479492,-0.014175415,0.009254456,-0.010185242,0.0046424866,-0.021072388,-0.0073432922,0.015434265,-0.0065574646,0.021499634,0.0234375,0.017669678,-0.026412964,-0.018508911,0.01424408,-0.015342712,-0.019943237,0.027740479,0.015396118,0.01058197,-0.021896362,0.02407837,0.01701355,-0.020950317,-0.017349243,-0.0014953613,0.037994385,-0.01436615,-0.009552002,0.022964478,0.008277893,0.021896362,-0.061462402,-0.003868103,0.012649536,0.014427185,-0.016418457,-0.046051025,-0.044647217,0.014183044,0.029220581,0.0024719238,0.021072388,0.033569336,0.00031495094,0.007358551,0.016052246,-0.0016231537,-0.012191772,-0.0077171326,-0.047424316,-0.017211914,-0.0129852295,0.008331299,-0.030166626,0.019882202,-0.019943237,-0.047576904,0.00024330616,-0.0066490173,-0.009635925,0.002412796,0.018951416,0.039611816,0.008399963,0.01260376,-0.014038086,-0.025283813,0.00504303,-0.0063438416,0.030838013,-0.045684814,0.016052246,-0.0032157898,-0.0141067505,0.0030117035,0.005241394,0.021453857,0.018875122,0.013244629,0.041168213,-0.045166016,0.05230713,-0.032073975,0.027755737,0.015205383,-0.05001831,-0.017211914,-0.03125,-0.012825012,0.032348633,-0.0146865845,-0.0069389343,-0.022766113,-0.020965576,-0.0050697327,-0.05130005,0.018508911,0.030654907,0.044281006,-0.017959595,0.00092840195,0.015174866,0.003774643,-0.028289795,-0.002281189,-0.011222839,0.016098022,0.026611328,0.008552551,-0.003320694,-0.026123047,-0.00894928,0.0076141357,-0.061584473,-0.055023193,-0.015205383,0.0077171326,-0.0048713684,-0.011756897,-0.012969971,-0.030685425,0.006752014,-0.041992188,0.011657715,0.0073928833,0.026489258,0.012496948,-0.023590088,-0.003545761,0.016052246,-0.02519226,0.030075073,-0.0062942505,-0.0066566467,-0.03213501,-0.002878189,0.027191162,0.008308411,-0.0014505386,-0.017105103,-0.011054993,-0.01802063,-0.044799805,0.0051841736,-0.000057458878,-0.0028095245,-0.0073661804,0.003982544,-0.050750732,-0.00038957596,-0.024276733,-0.02130127,0.032592773,0.0031490326,0.0050315857,-0.008644104,0.006385803,-0.002155304,-0.013206482,-0.027618408,0.017440796,0.011894226,-0.0070648193,0.011993408,0.03729248,-0.00579834,-0.012702942,-0.00027489662,0.0128479,0.020385742,-0.024368286,0.0069351196,-0.018966675,0.014633179,-0.014053345,-0.00818634,-0.03225708,-0.0025291443,0.064697266,-0.00041341782,-0.009643555,-0.0071525574,-0.019073486,0.0063285828,0.034057617,-0.047821045,-0.0041618347,-0.034362793,0.019897461,-0.026779175,0.01576233,0.0010509491,0.020263672,-0.024047852,-0.061523438,-0.0019874573,0.013320923,-0.013320923,-0.05810547,-0.018508911,-0.07220459,-0.0052757263,-0.013404846,-0.022994995,0.00039076805,0.0031280518,-0.019744873,-0.07611084,0.010551453,0.05203247,-0.00447464,0.02281189,-0.0017232895,0.016403198,0.039489746,-0.022827148,-0.0028476715,0.031707764,-0.023498535,-0.013679504,-0.008399963,0.015052795,-0.010658264,-0.008979797,0.023605347,0.018432617,0.01096344,0.0027275085,0.022094727,-0.008239746,0.02067566,-0.011154175,0.014320374,-0.012207031,-0.013046265,0.04156494,-0.055877686,0.029159546,0.011871338,0.00048828125,0.003036499,0.03741455,0.04559326,-0.042175293,-0.02357483,0.041107178,0.0070533752,0.03137207,-0.036132812,0.048034668,0.013496399,-0.016616821,0.0132751465,-0.015380859,-0.021591187,-0.0362854,-0.04446411,0.0289917,0.005092621,0.0023231506,-0.014564514,-0.0066223145,0.013595581,-0.00233078,-0.0003681183,-0.01739502,-0.015731812,-0.015930176,0.0011577606,-0.0041122437,0.009887695,-0.005718231,0.027664185,0.010063171,0.03616333,-0.000013947487,-0.0018396378,0.005508423,0.026016235,-0.014930725,0.004711151,0.018676758,0.017166138,0.017929077,0.023986816,0.011909485,-0.043518066,-0.00274086,-0.017745972,-0.0038318634,0.00031781197,-0.02079773,-0.0006685257,-0.005218506,0.003408432,-0.01512146,-0.042022705,-0.002243042,-0.028152466,-0.019500732,0.004043579,0.001285553,0.026733398,0.010734558,0.0011396408,0.009429932,0.0020389557,0.05859375,-0.00491333,-0.0045318604,0.02772522,0.027511597,0.012535095,-0.03955078,-0.008346558,-0.0107803345,-0.0070533752,-0.0028076172,-0.028259277,0.018310547,0.042877197,-0.01259613,0.007858276,-0.008621216,0.01838684,0.0025253296,0.005088806,-0.012397766,0.019180298,-0.017181396,0.030654907,-0.039916992,0.02041626,0.014892578,0.0017719269,-0.009315491,-0.03225708,-0.022415161,0.01374054,-0.0016698837,0.002822876,0.044708252,-0.0006494522,0.029724121,-0.02330017,-0.015586853,0.0103302,-0.029541016,-0.018630981,0.027328491,-0.0023078918,0.013824463,0.008026123,-0.026046753,0.025039673,-0.0423584,0.015205383,0.00071287155,0.0044555664,-0.00969696,-0.0058021545,-0.024642944,-0.008529663,-0.010421753,0.006385803,0.0029773712,0.04421997,0.021591187,0.033233643,0.04248047,0.020629883,0.0076446533,-0.044158936,-0.031173706,-0.0060272217,-0.027267456,0.018081665,-0.0047569275,0.03048706,0.036376953,0.009529114,0.034332275,0.033355713,0.035308838,-0.0030899048,0.01927185,-0.024963379,0.01448822,-0.01134491,0.028213501,0.005012512,0.03543091,-0.018539429,0.01473999,0.0023784637,0.03427124,-0.023208618,0.028808594,0.06781006,0.023010254,-0.005493164,0.033721924,-0.002035141,-0.020095825,-0.008934021,-0.019073486,0.06390381,0.021072388,0.05029297,0.045532227,0.018478394,-0.010551453,0.01864624,-0.029708862,-0.026855469,0.0736084,0.03253174,-0.026245117,-0.018310547,-0.0040512085,0.014472961,-0.051849365,-0.024505615,0.01777649,0.0053215027,0.00088500977,-0.010383606,-0.013435364,-0.014373779,0.010215759,0.0126571655,0.012420654,-0.017150879,0.019332886,0.020324707,0.012397766,0.025787354,-0.002620697,0.033691406,-0.027145386,-0.013595581,0.009841919,0.020355225,-0.0077667236,0.0021152496,0.026763916,0.01033783,0.04095459,0.035491943,-0.0178833,-0.006286621,0.024505615,0.019256592,0.002298355,0.048614502,0.041229248,0.0146102905,0.03086853,0.035247803,0.030456543,-0.03741455,0.013122559,0.00091362,0.012550354,0.00390625,-0.012451172,0.0116119385,-0.011657715,0.02015686,-0.0027751923,-0.013473511,0.029373169,0.029708862,-0.007896423,-0.007980347,-0.0043411255,0.013267517,-0.005970001,-0.0061912537,0.0030231476,-0.008918762,0.019470215,0.020385742,0.031036377,-0.0262146,0.022918701,-0.003227234,-0.021377563,-0.010696411,0.024383545,-0.03881836,-0.000045597553,-0.0021877289,-0.010429382,-0.037872314,0.010604858,0.018493652,-0.013549805,0.018005371,0.017852783,-0.004043579,-0.00881958,0.02406311,0.024414062,-0.012329102,-0.0068130493,-0.017333984,0.031433105,0.04043579,0.001909256,0.006958008,-0.016052246,-0.008460999,0.010116577,0.00466156,0.0041236877,0.0053710938,-0.012519836,-0.016738892,0.014717102,0.036224365,0.017715454,0.033966064,-0.009857178,-0.0289917,0.006614685,0.03225708,0.010749817,0.004501343,-0.003709793,0.018981934,-0.015686035,0.041412354,0.03289795,0.0066566467,0.03062439,-0.007888794,-0.0036964417,0.011352539,-0.022079468,0.03491211,-0.019592285,0.010429382,-0.0110321045,0.01953125,-0.015083313,-0.030380249,0.008071899,-0.021636963,-0.02835083,-0.031951904,0.009536743,0.000248909,0.02330017,0.0289917,0.0138168335,-0.027786255,0.06213379,-0.010620117,0.050231934,-0.004219055,-0.0059890747,0.04486084,0.030410767,0.031341553,0.02243042,0.009170532,-0.035614014,0.018188477,0.036376953,0.027328491,0.00409317,0.0076141357,-0.011123657,0.031143188,-0.010932922,0.02986145,-0.009681702,0.0102005005,0.012008667,-0.010604858,-0.013473511,0.0020122528,-0.006790161,0.007472992,0.05130005,-0.016967773,-0.015777588,-0.027450562,-0.0052871704,0.02331543,0.0052757263,0.0020065308,-0.007637024,-0.021575928,0.009803772,-0.0317688,-0.028778076,0.0211792,0.030029297,-0.044891357,-0.01612854,0.013694763,0.025054932,-0.021118164,0.02848816,0.021835327,-0.012512207,0.014007568,0.04006958,-0.00674057,0.024490356,-0.006088257,0.029129028,0.03982544,0.00995636,-0.019332886,-0.003993988,0.009429932,-0.0055351257,0.01171875,0.03125,-0.0034980774,0.013572693,-0.004371643,-0.011451721,-0.0069007874,0.011932373,-0.0146484375,0.014526367,-0.011795044,-0.0034065247,0.012260437,0.012954712,-0.002313614,0.009864807,-0.02368164,-0.009651184,0.0023918152,0.026428223,0.017807007,-0.030197144,-0.002872467,0.011756897,0.0113220215,-0.024841309,-0.015106201,-0.011390686,-0.029541016,0.016815186,0.021224976,0.011833191,0.017532349,-0.025268555,0.0020198822,0.03677368,-0.006843567,0.0234375,0.0032577515,-0.0184021,0.00056934357,-0.022598267,-0.008834839,-0.006603241,-0.017868042,0.014915466,0.017150879,0.0038452148,-0.02645874,0.02519226,-0.0024528503,0.020690918,-0.0077667236,-0.015411377,0.007247925,-0.018966675,-0.012168884,0.0028057098,0.012649536,-0.007949829,-0.011756897,-0.028289795,0.033355713,0.050567627,-0.0036754608,-0.0151901245,0.018463135,0.01939392,0.025924683,0.044189453,0.02420044,0.040374756,0.012161255,-0.020095825,-0.025268555,0.026519775,-0.0004041195,-0.03552246,0.015487671,-0.0057411194,-0.0032749176,0.012588501,0.01399231,-0.012130737,-0.024902344,-0.016921997,-0.016540527,-0.021987915,0.018508911,-0.0011949539,0.017684937,-0.031036377,-0.013931274,0.008590698,-0.03338623,-0.046966553,-0.02482605,0.0031147003,-0.008773804,-0.060546875,0.002729416,-0.031433105,0.007457733,-0.027557373,0.007080078,-0.015327454,0.024658203,-0.013412476,-0.0029525757,0.0061149597,0.019973755,0.01953125,0.0043296814,0.018218994,-0.033721924,-0.017852783,-0.017288208,0.020385742,-0.020324707,0.018066406,0.0070533752,0.037231445,0.02532959,-0.0124053955,0.0063209534,-0.019073486,0.00044894218,0.008171082,-0.03262329,-0.022491455,0.024505615,0.022827148,-0.009208679,-0.013397217,0.037017822,-0.023864746,-0.00015795231,0.017990112,0.043701172,0.009628296,0.027770996,-0.015037537,-0.00029873848,-0.024932861,-0.0015993118,-0.01109314,0.00806427,0.014511108,0.003332138,-0.0028419495,0.007587433,0.015792847,-0.009811401,-0.008361816,0.029708862,0.01361084,-0.02835083,0.032958984,0.023742676,0.013008118,-0.0014429092,-0.009399414,0.023513794,0.059448242,0.0010728836,0.012641907,-0.002374649,0.013870239,-0.004146576,0.009643555,0.020996094,-0.022094727,-0.041870117,-0.018066406,-0.020080566,0.027938843,0.0019006729,0.013496399,-0.010215759,0.013572693,-0.016601562,-0.03152466,-0.023605347,0.019073486,0.006713867,-0.019515991,-0.008766174,0.006668091,0.025482178,-0.02696228,-0.0013751984,-0.044036865,-0.025894165,-0.023361206,-0.020065308,0.022735596,0.008636475,-0.0039520264,0.008628845,0.00032019615,-0.0041999817,0.0029067993,0.02331543,-0.017028809,0.0035495758,0.01687622,0.017608643,-0.029342651,0.022994995,-0.0076560974,-0.008552551,0.0059432983,-0.0128479,0.016235352,-0.021102905,0.030792236,-0.00004529953,0.00919342,0.034362793,-0.00046491623,0.0146102905,-0.021072388,-0.0017881393,-0.0075149536,-0.0017080307,0.05078125,-0.014022827,-0.02230835,0.014930725,-0.015853882,-0.02368164,-0.000538826,0.023971558,0.033569336,-0.012886047,0.045837402,-0.02268982,-0.002105713,0.00037240982,0.009422302,-0.016845703,0.0040626526,0.029159546,0.012458801,0.002008438,0.0021324158,-0.01727295,-0.031555176,-0.011268616,0.02104187,-0.0019760132,-0.019378662,0.011703491,0.02015686,0.045715332,-0.0012960434,0.016204834,0.027236938,-0.0020370483,0.033813477,-0.0006747246,0.051208496,-0.005596161,-0.03656006,0.005203247,-0.008331299,-0.02468872,-0.002954483,0.008682251,0.0070724487,-0.03656006,0.010284424,-0.004245758,0.028289795,-0.010238647,0.014511108,-0.026107788,-0.00756073,-0.031036377,-0.005672455,-0.044281006,0.014305115,0.03829956,0.012702942,0.023803711,0.0025291443,-0.021728516,0.033935547,0.050323486,-0.0098724365,-0.032684326,-0.018218994,0.011383057,-0.00006508827,0.00818634,0.008926392,-0.013290405,-0.010131836,0.0038661957,-0.021102905,0.01335907,-0.012802124,0.012275696,0.005130768,-0.0048446655,-0.0007944107,0.022155762,-0.001531601,-0.0025463104,0.012107849,-0.007133484,0.04046631,0.031219482,-0.006904602,0.022415161,0.0071754456,-0.041107178,0.05267334,-0.01083374,0.042510986,-0.018112183,0.01374054,-0.031066895,-0.012191772,-0.009178162,0.019470215],"createdAt":"2026-04-18T18:44:54.485Z","updatedAt":"2026-04-22T12:03:40.145Z","lastSeenAt":"2026-04-22T12:03:40.145Z","tsv":"'/api':164 '/api/v1/charges/3':57,196 '/docs':163 '/pricing':165 '/readme':167 '/request':16,32 '0.02':15,31,86,143 '000':77 '20':76 '6':82 'accept':64 'access':62,224 'actual':216 'advertis':94,100 'ai':9,25,112 'ai-inference' 'analysi':116 'analyt':8,24,106 'api':4,20,42,61,148,208,223 'base':7,23,51,68,78 'base network api' 'beyond':220 'broader':98 'call':41 'categori':102,209 'challeng':71 'classif':119 'classification' 'clear':201 'collect':36 'commit':156 'connect':173 'consist':89 'content':179 'convers':136 'data':105,109 'data-analytics' 'decim':83 'detail':190 'document':158,191 'embed':120 'embeddings' 'endpoint':13,29,43,55,104,139,194,197 'equal':85 'estim':130 'exampl':187 'exchang':125 'export':110 'extrem':160 'feed':124 'financ':10,26,121 'finance-data' 'flat':95 'four':101 'function':217 'gas':129 'generat':137 'geocod':134 'geocoding' 'indic':72 'infrastructur':132 'insight':111 'key':149 'label':59,225 'land':212 'learn':114 'limit':152 'list':141 'low payment fee' 'lowpaymentfee.com':33 'machin':113 'map':202 'maxamountrequir':74 'metric':107 'micropayment api' 'minimum':155 'name':207 'network':52 'offer':34 'openapi':183 'page':168,213 'pay':39 'pay per call api' 'pay-per-cal':38 'pay-per-request' 'payabl':3,19 'payment':66 'per':40,87,144 'platform':99 'premium':60,222 'premium api access' 'price':96,123 'prompt':175 'protocol':48 'quot':128 'rate':126,151 'render':170 'report':108 'request':88,145 'request/response':186 'requir':157 'schema':184 'secur':44 'sentiment':115 'sentiment-analysis' 'site':92 'spars':161 'specif':54 'suit':5,21 'summar':118 'text':117 'text-summarization' 'token':127 'unit':79 'unknown':219 'usdc':65,81 'usdc api access' 'usdc-base' 'util':12,28,133 'utility-apis' 'valid':135 'via':45 'wallet':174 'web3':122 'x402':2,18,47,70 'x402 api' 'x402-payable':1,17 'x402-payment'","prices":[{"id":"ae2ba20a-d78f-4e2e-ad60-d8f8a9e5bd0d","listingId":"18c2e6d1-94f4-4293-ae26-d258c466801e","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/charges/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:54.485Z"}],"sources":[{"listingId":"18c2e6d1-94f4-4293-ae26-d258c466801e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:54.485Z","lastSeenAt":"2026-04-22T12:03:40.145Z"}],"details":{"listingId":"18c2e6d1-94f4-4293-ae26-d258c466801e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/3 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/3"},{"claim":"The site advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four categories of endpoints are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/3"}],"useCases":["Paying per-request for AI inference tasks like sentiment analysis or text summarization without needing an API key","Fetching real-time financial data such as token quotes, exchange rates, or gas estimates via micropayments","Running data analytics queries (metrics, reports, insights) on a pay-as-you-go basis","Using utility services like geocoding or data validation without subscription commitments"],"bestFor":["Agents or developers who want keyless, pay-per-call API access on Base","Low-volume or bursty workloads where subscription pricing is wasteful","x402-compatible clients that can settle USDC micropayments on Base"],"notFor":["High-volume production workloads requiring guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.076Z"},"updatedAt":"2026-04-22T12:03:40.145Z"}}