{"id":"45726ebc-73af-488e-bd88-0112ba428ffe","shortId":"3Dkzme","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/240` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount required of 20,000 base units — which, at 6 decimals for USDC, equals $0.02 per request. No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header to each request.\n\nThe broader platform advertises 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 listed endpoints are priced at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/240`) does not clearly map to any of those named services — its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what it actually does beyond accepting payment is unknown from the available sources.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-gated endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet' with no content","The endpoint path /api/v1/charges/240 does not correspond to any of the named API services listed on the homepage","No request or response schema is available; it is unknown what this endpoint returns","No OpenAPI specification or examples found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/240","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/240","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what the endpoint actually returns. The docs pages are all blank 'Connect wallet' stubs. The endpoint path '/api/v1/charges/240' doesn't match any of the named services on the homepage.","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":"2026-04-19T03:34:58.472Z","embedding":[-0.020141602,-0.022491455,0.040283203,0.017990112,0.013824463,-0.037078857,-0.027938843,0.03326416,0.07305908,-0.078308105,0.035705566,-0.04550171,-0.033477783,-0.022232056,-0.043701172,0.0024433136,-0.022323608,0.013031006,-0.059143066,0.042236328,0.028762817,-0.013252258,-0.01626587,0.03982544,-0.0046157837,-0.01625061,0.00089263916,-0.022781372,-0.0129470825,-0.023132324,0.028411865,-0.026138306,-0.004611969,0.015640259,-0.00072193146,-0.02015686,-0.005092621,0.052734375,0.030136108,-0.00712204,0.0008568764,-0.0501709,-0.009994507,-0.006706238,-0.060394287,-0.006416321,0.00920105,-0.01966858,-0.016967773,0.007499695,-0.035339355,-0.0053215027,-0.020935059,0.011077881,0.014907837,0.015541077,-0.019454956,-0.01335144,0.0068092346,-0.0018568039,-0.0042800903,-0.07067871,-0.013450623,0.0045166016,-0.0040359497,0.0473938,-0.0124053955,0.04763794,0.017456055,0.05331421,0.04434204,0.04425049,0.03955078,0.0055389404,-0.002960205,-0.008430481,0.0066108704,0.06274414,-0.015258789,0.0015888214,-0.022537231,-0.0052986145,-0.047576904,-0.006385803,-0.02154541,-0.045684814,-0.018249512,0.012336731,-0.019729614,0.025527954,-0.074279785,0.0027828217,-0.017684937,0.013931274,0.009719849,-0.0048446655,-0.009918213,0.02394104,-0.014503479,0.023788452,0.012863159,-0.038604736,0.012939453,0.019851685,0.064331055,0.038726807,0.018692017,0.03640747,0.0031261444,-0.028564453,-0.02130127,0.0075416565,-0.022262573,-0.012908936,0.002111435,0.00881958,-0.019378662,0.0178833,-0.02268982,0.016479492,-0.059783936,0.056915283,0.04034424,-0.019699097,0.018463135,-0.035003662,-0.020492554,-0.00060272217,-0.031311035,-0.009765625,0.020690918,0.007980347,0.039794922,-0.033569336,-0.029510498,-0.002117157,-0.017715454,-0.026626587,-0.05340576,-0.029190063,0.035491943,-0.025161743,0.030471802,0.02960205,-0.103271484,-0.011955261,-0.050323486,0.013198853,-0.045318604,-0.0010538101,-0.011512756,0.029388428,-0.021438599,-0.01789856,-0.013511658,-0.0034484863,-0.009460449,0.039520264,-0.009178162,0.043029785,-0.009048462,0.031311035,0.012916565,0.0035266876,0.023330688,0.027786255,-0.0027751923,-0.0793457,-0.082458496,-0.024902344,-0.0021476746,-0.011299133,-0.04498291,0.007167816,-0.008964539,-0.08654785,-0.031341553,-0.0047187805,-0.0049934387,-0.033477783,-0.010505676,-0.022644043,0.013435364,-0.019851685,-0.07183838,-0.020614624,-0.019592285,0.0715332,0.012046814,0.006980896,0.017974854,-0.01374054,0.06317139,0.02734375,-0.032318115,-0.042022705,0.018951416,-0.010864258,0.034210205,0.009284973,0.005897522,-0.045562744,0.04071045,0.04525757,0.021881104,-0.02204895,0.008766174,-0.05758667,-0.04119873,-0.04107666,0.007888794,0.0013837814,-0.010368347,0.03250122,-0.026046753,-0.036468506,-0.0013008118,-0.0028247833,0.02720642,0.066101074,0.005756378,-0.004749298,-0.009162903,0.021652222,-0.039001465,0.044921875,0.030410767,0.02407837,-0.03086853,-0.00881958,0.013420105,0.034332275,-0.044952393,-0.0029582977,-0.019546509,0.009765625,0.011672974,-0.000092089176,0.04537964,-0.01751709,-0.029220581,-0.027526855,-0.016998291,0.028076172,0.0112838745,-0.039276123,-0.045837402,-0.07489014,0.033996582,0.046722412,0.023971558,0.0033779144,0.011230469,-0.02507019,-0.013572693,-0.08148193,0.053131104,0.07171631,-0.025985718,-0.017028809,0.028900146,-0.014511108,-0.02658081,-0.011924744,-0.0049743652,-0.025619507,-0.023345947,0.006023407,-0.03286743,-0.0018072128,0.020126343,0.030273438,0.05947876,-0.014450073,-0.061584473,-0.042816162,-0.003194809,-0.0015325546,-0.015609741,-0.00032520294,-0.011947632,0.009140015,0.032348633,-0.0018463135,0.029083252,0.0034332275,0.02067566,-0.01084137,-0.008560181,-0.022842407,-0.009544373,0.01751709,-0.009788513,-0.072387695,0.014556885,-0.0047035217,0.062805176,-0.03515625,0.0463562,-0.011749268,0.014701843,0.06384277,-0.023895264,-0.03955078,0.0010986328,0.029006958,0.02986145,0.035461426,0.012489319,-0.015609741,-0.009918213,0.058654785,-0.011199951,-0.002357483,-0.001458168,0.022354126,0.0395813,0.0032863617,-0.07684326,-0.044830322,-0.011810303,-0.031036377,0.022888184,-0.033966064,0.028900146,-0.010787964,0.009223938,-0.022659302,0.01234436,-0.037994385,0.012390137,-0.027511597,0.0004911423,-0.018997192,-0.020446777,0.024856567,0.01977539,-0.01852417,-0.0065460205,0.03463745,0.025604248,-0.009155273,-0.028869629,-0.01285553,-0.024520874,0.0075263977,0.012374878,0.031982422,0.025161743,0.03768921,-0.03729248,0.0178833,0.019927979,0.023651123,0.04650879,-0.014633179,0.01109314,-0.048797607,-0.052764893,-0.017120361,-0.04159546,0.030975342,0.008148193,0.014122009,0.041809082,0.004650116,-0.018447876,-0.03137207,0.02458191,-0.038604736,-0.0023822784,0.034729004,-0.009864807,-0.040740967,0.000017046928,-0.000916481,0.010314941,0.03149414,0.0146102905,-0.0082092285,0.064575195,0.037384033,0.012077332,0.016571045,0.013671875,0.026229858,-0.012252808,-0.032989502,-0.022750854,-0.008140564,0.0140686035,-0.014945984,-0.02796936,-0.061584473,0.03945923,0.026275635,0.075683594,0.0022392273,0.013542175,0.031982422,-0.0057907104,0.020111084,-0.029571533,-0.021362305,-0.022964478,-0.052246094,0.03793335,-0.006351471,-0.010269165,-0.026885986,0.039001465,0.0104904175,0.011932373,-0.035705566,0.05899048,-0.002357483,-0.019165039,0.02545166,0.010383606,0.05697632,0.060668945,-0.04852295,0.013549805,0.025344849,-0.043670654,-0.010795593,0.039794922,-0.00843811,-0.015113831,-0.06011963,-0.027435303,0.014701843,-0.010696411,-0.07006836,-0.0010175705,0.016204834,0.022262573,0.0046195984,-0.013114929,-0.025482178,-0.008743286,-0.02859497,-0.050933838,-0.010002136,-0.047332764,0.00749588,0.037872314,-0.034088135,0.009391785,-0.0009889603,0.011260986,-0.006313324,0.030761719,0.000541687,-0.015701294,-0.057128906,0.031707764,0.020736694,-0.00042390823,0.011207581,0.026306152,0.034057617,0.016983032,0.050354004,0.009307861,-0.02178955,-0.06506348,0.017425537,-0.0362854,0.004497528,-0.0018091202,-0.017211914,-0.004432678,-0.020599365,-0.019866943,-0.022872925,-0.0036830902,-0.03186035,0.0067596436,0.020248413,-0.035339355,-0.029708862,-0.060668945,-0.015914917,0.00579834,0.07330322,0.017745972,-0.0107803345,-0.06109619,-0.012672424,0.018173218,0.004135132,0.0072021484,-0.015930176,-0.016418457,-0.0090408325,-0.035491943,-0.025619507,-0.02078247,0.024414062,-0.013366699,-0.017959595,0.027526855,-0.02017212,0.011604309,-0.0021572113,-0.0015420914,0.030761719,-0.03062439,-0.01574707,-0.029815674,0.017044067,-0.007835388,-0.0006942749,-0.04776001,0.045288086,0.018447876,0.040527344,-0.039489746,0.006839752,-0.0066871643,0.014404297,0.019622803,-0.016418457,-0.010238647,0.009376526,-0.04196167,-0.055664062,0.02558899,-0.015235901,0.017333984,-0.00048065186,-0.0012216568,0.03010559,-0.004852295,0.008338928,0.024398804,-0.024383545,0.005126953,-0.02722168,-0.04537964,-0.0119018555,0.008415222,-0.010421753,0.026260376,-0.026855469,0.02204895,-0.014190674,-0.021377563,0.039611816,0.00894165,-0.010688782,0.025482178,0.012588501,0.012435913,0.05419922,0.011390686,-0.024093628,0.027832031,0.0016450882,0.006088257,-0.0071640015,0.044006348,0.008010864,-0.020126343,-0.005634308,-0.010009766,-0.006362915,-0.01939392,-0.016921997,0.008377075,0.03353882,0.007446289,-0.042877197,0.034973145,0.020126343,-0.025924683,-0.009613037,0.018615723,0.018997192,-0.031707764,0.029815674,0.029815674,0.062438965,-0.030929565,0.00289917,0.008262634,0.034118652,0.025405884,0.01977539,-0.010757446,0.0078125,-0.014945984,0.0043678284,0.001791954,-0.010658264,0.013031006,-0.009399414,0.015327454,0.026123047,0.027755737,-0.01876831,-0.028244019,0.0034637451,-0.013999939,-0.012817383,0.011566162,0.017242432,0.008224487,-0.020187378,0.030166626,0.022903442,-0.028945923,-0.020904541,-0.00031399727,0.03933716,-0.021697998,-0.011932373,0.017242432,0.006793976,0.043518066,-0.054107666,-0.006614685,0.013153076,0.016448975,-0.014801025,-0.038330078,-0.04147339,0.0041046143,0.040252686,0.00756073,0.008255005,0.035980225,0.0050964355,0.007419586,0.02571106,0.0007944107,-0.024612427,-0.012413025,-0.046447754,-0.0054244995,-0.007575989,-0.002380371,-0.022857666,0.013504028,-0.025115967,-0.039489746,0.0045928955,-0.011474609,-0.008926392,-0.003982544,0.015029907,0.034484863,0.0007100105,0.014419556,-0.014190674,-0.020217896,0.0082092285,-0.0015516281,0.029266357,-0.040008545,0.013381958,-0.017654419,0.0014724731,-0.010719299,0.0013027191,0.021530151,0.019226074,0.0022029877,0.028564453,-0.038970947,0.044677734,-0.037872314,0.010627747,0.0070266724,-0.035095215,-0.010284424,-0.031555176,-0.01991272,0.038909912,-0.023101807,-0.0006327629,-0.02999878,-0.013130188,-0.0051078796,-0.044830322,0.02468872,0.03378296,0.04019165,-0.025177002,-0.0008583069,0.012283325,0.0008468628,-0.021331787,0.00233078,-0.013374329,0.008865356,0.020828247,0.013786316,-0.024276733,-0.02520752,-0.00894165,0.0026512146,-0.051116943,-0.042907715,-0.01676941,0.02192688,-0.01184845,-0.009277344,-0.028060913,-0.022537231,0.0035705566,-0.036895752,0.01335144,0.008430481,0.029022217,0.01586914,-0.015991211,-0.00066804886,0.018661499,-0.014457703,0.03668213,-0.009475708,-0.0040359497,-0.038024902,-0.00016701221,0.043701172,0.018341064,-0.0063476562,0.0005259514,-0.0023994446,-0.02482605,-0.044830322,-0.0017251968,-0.0110321045,0.009239197,0.004257202,0.0011138916,-0.05154419,-0.0060272217,-0.019134521,0.0018005371,0.021575928,0.016021729,0.020431519,-0.008453369,0.007637024,-0.011665344,-0.017730713,-0.033081055,0.016357422,0.011695862,-0.0042800903,0.007007599,0.03463745,0.012329102,-0.015686035,0.0018129349,-0.0022678375,0.01802063,-0.02986145,0.013442993,-0.020065308,0.011566162,-0.008911133,-0.0141067505,-0.034179688,-0.006904602,0.08087158,-0.003156662,-0.0048561096,-0.004470825,-0.0104904175,0.018814087,0.025146484,-0.05908203,-0.0071907043,-0.03878784,0.027420044,-0.02949524,0.013259888,-0.0007405281,0.01965332,-0.023712158,-0.066467285,-0.008781433,0.013465881,-0.0064735413,-0.05517578,-0.008262634,-0.05899048,-0.0070877075,-0.0032672882,-0.015487671,-0.005935669,0.009162903,-0.021743774,-0.09210205,0.010566711,0.051971436,0.011367798,0.011451721,-0.023132324,0.016159058,0.029541016,-0.015449524,-0.018096924,0.031143188,-0.023162842,-0.0134887695,-0.024353027,0.02796936,-0.015991211,-0.019515991,0.026794434,0.015670776,0.023986816,-0.009780884,0.0059547424,-0.0061798096,0.013092041,-0.009811401,0.005016327,0.00076436996,-0.0126953125,0.024749756,-0.046966553,0.040985107,0.016281128,0.005306244,-0.0011758804,0.020751953,0.030578613,-0.035186768,-0.019485474,0.04714966,0.00737381,0.050323486,-0.029541016,0.04815674,0.030899048,-0.017730713,0.021652222,-0.007507324,-0.022506714,-0.04031372,-0.029953003,0.013076782,0.018798828,0.0107803345,-0.010848999,-0.0012836456,0.023101807,-0.016433716,0.013130188,-0.021087646,-0.021270752,-0.0116119385,0.0103302,0.011253357,0.005836487,-0.0069274902,0.018966675,0.021820068,0.037872314,-0.00008839369,-0.008781433,0.006504059,0.022338867,-0.0151901245,0.013999939,0.006011963,0.01499939,0.021209717,0.02104187,0.009101868,-0.033447266,-0.020751953,-0.0146102905,-0.005683899,0.0014810562,0.008155823,-0.002380371,-0.0010652542,-0.0013027191,-0.0037708282,-0.041381836,0.013877869,-0.027755737,-0.024337769,-0.003063202,-0.0029830933,0.011375427,-0.00014185905,-0.0036754608,0.01776123,0.005455017,0.055023193,-0.0059127808,0.0035381317,0.021621704,0.036468506,0.012466431,-0.030822754,-0.012886047,-0.016311646,-0.0076179504,0.0060539246,-0.015113831,0.017532349,0.039093018,-0.00982666,0.014770508,-0.0072631836,0.015327454,0.0079956055,0.0057525635,-0.011627197,0.006290436,-0.021011353,0.032440186,-0.040649414,0.008621216,0.02116394,0.009597778,-0.0031833649,-0.014083862,-0.029632568,0.0074539185,0.01272583,-0.007549286,0.053741455,-0.00944519,0.023910522,-0.021636963,-0.022750854,0.013076782,-0.03314209,-0.023956299,0.033447266,-0.0151901245,0.000084757805,0.014274597,-0.03149414,0.028457642,-0.04031372,0.01638794,-0.003730774,-0.0031795502,-0.010482788,-0.02041626,-0.015670776,-0.017913818,-0.026626587,0.014160156,-0.003255844,0.03955078,0.027114868,0.023986816,0.034210205,0.018341064,-0.0011062622,-0.038116455,-0.03100586,-0.004047394,-0.031677246,0.017425537,-0.01713562,0.03390503,0.043640137,-0.008033752,0.0362854,0.0390625,0.029785156,-0.006465912,0.010185242,-0.017837524,0.011192322,-0.009643555,0.029388428,0.0037002563,0.040496826,-0.028030396,0.017150879,0.0023460388,0.027709961,-0.024810791,0.02470398,0.075805664,0.026611328,-0.0076828003,0.032440186,-0.005783081,-0.008323669,-0.018417358,-0.013191223,0.06341553,0.020980835,0.048736572,0.04714966,0.011604309,-0.011734009,0.024673462,-0.024658203,-0.032958984,0.06512451,0.018127441,-0.02532959,-0.0051078796,-0.011016846,0.012619019,-0.04901123,-0.025161743,0.018218994,0.008621216,0.015808105,-0.012710571,-0.0054016113,-0.01977539,0.017456055,0.017684937,0.0138549805,-0.015586853,0.009521484,0.026657104,0.0077705383,0.022277832,0.0031280518,0.019989014,-0.02935791,-0.014663696,0.0044670105,0.016830444,-0.0090408325,0.0020999908,0.022781372,0.020751953,0.046844482,0.030761719,-0.020690918,-0.008460999,0.029571533,0.024353027,0.0006365776,0.046081543,0.03866577,0.021209717,0.038879395,0.0418396,0.020401001,-0.040924072,0.016448975,0.003730774,0.011581421,0.00579834,-0.010017395,0.0030231476,-0.010093689,0.01966858,0.0015010834,-0.013671875,0.03277588,0.027999878,-0.0031871796,0.0006933212,-0.003862381,0.0013217926,-0.007896423,0.00018954277,0.0068206787,-0.018157959,0.016738892,0.008308411,0.027130127,-0.023376465,0.026550293,-0.0038890839,-0.02243042,-0.0009822845,0.0063972473,-0.042175293,-0.003293991,-0.0064964294,-0.00340271,-0.033691406,0.010803223,0.022323608,-0.00022387505,0.030685425,0.012893677,0.00054597855,-0.00031375885,0.022659302,0.012001038,-0.0010480881,-0.015083313,-0.016418457,0.032806396,0.042022705,0.00097084045,0.0082092285,-0.021820068,0.0011997223,0.0076179504,-0.0049476624,0.002696991,-0.002664566,-0.018569946,-0.03173828,0.013916016,0.0368042,0.017364502,0.031433105,0.0006227493,-0.032226562,0.007347107,0.029541016,0.0041885376,0.010536194,-0.0095825195,0.026947021,-0.0069274902,0.048706055,0.027404785,-0.00060224533,0.021118164,-0.022888184,-0.012794495,0.010551453,-0.0128479,0.021270752,-0.015960693,0.0059890747,-0.021072388,0.015823364,-0.02583313,-0.043182373,0.008125305,-0.014717102,-0.020202637,-0.027923584,0.008216858,0.004878998,0.018371582,0.040039062,0.022323608,-0.030929565,0.06695557,-0.015312195,0.056365967,-0.008880615,-0.010215759,0.056640625,0.051574707,0.04159546,0.016143799,0.017501831,-0.023040771,0.010765076,0.04458618,0.027709961,0.011833191,-0.002840042,-0.015640259,0.027236938,-0.0098724365,0.014801025,-0.009017944,0.001748085,0.0048294067,-0.0034103394,-0.01828003,0.0022563934,-0.005996704,0.008758545,0.051239014,-0.030090332,-0.021148682,-0.026351929,-0.014854431,0.031066895,0.000022768974,0.0023002625,-0.0037612915,-0.021087646,0.0075416565,-0.030517578,-0.016586304,0.009086609,0.026473999,-0.045318604,-0.01725769,-0.0030555725,0.016281128,-0.028060913,0.026290894,0.016525269,-0.009521484,0.009719849,0.051727295,-0.0043258667,0.041229248,-0.0024261475,0.017929077,0.030197144,0.0076904297,-0.016555786,-0.0050697327,0.00680542,-0.005016327,0.011131287,0.035247803,-0.014434814,0.015274048,0.00434494,-0.024871826,0.007663727,0.009590149,-0.004459381,0.0058670044,-0.0031661987,-0.011459351,0.0039901733,0.00466156,0.009544373,0.006263733,-0.002298355,-0.0059776306,-0.0014219284,0.03375244,0.010284424,-0.04925537,0.0034599304,0.01889038,0.0064582825,-0.030975342,-0.02645874,-0.014877319,-0.029678345,0.013641357,0.022766113,0.0074806213,0.011039734,-0.026367188,0.0013875961,0.027755737,0.0039978027,0.018463135,0.0044822693,-0.008201599,0.008422852,-0.029815674,-0.006175995,-0.0051994324,0.0013036728,0.012176514,0.011329651,-0.007858276,-0.031463623,0.018005371,0.0046157837,0.017318726,0.010307312,-0.009773254,0.022277832,-0.015205383,-0.011062622,0.013496399,0.01763916,-0.015396118,-0.013916016,-0.027832031,0.024734497,0.055633545,-0.006980896,-0.0071640015,0.009498596,0.011161804,0.02848816,0.032348633,0.010940552,0.035095215,0.025543213,-0.009300232,-0.020004272,0.016860962,-0.0029964447,-0.03778076,0.022323608,-0.006641388,-0.009605408,0.019363403,0.011329651,-0.007534027,-0.026382446,-0.021743774,-0.005592346,-0.016220093,0.025894165,-0.019165039,0.013549805,-0.026260376,-0.013000488,0.011146545,-0.020462036,-0.041503906,-0.03466797,-0.010185242,-0.012016296,-0.048980713,0.014434814,-0.03475952,0.010795593,-0.016113281,0.008010864,-0.0005059242,0.036621094,-0.004180908,0.0056610107,0.0072631836,0.025131226,0.0054626465,0.019348145,0.017715454,-0.030517578,-0.033996582,-0.020339966,-0.0028858185,-0.011810303,0.009284973,-0.0022602081,0.032348633,0.0076026917,-0.011100769,0.00223732,-0.014526367,-0.000028014183,-0.0033912659,-0.037628174,-0.021057129,0.01864624,0.021774292,-0.016571045,-0.0074272156,0.04147339,-0.023773193,-0.013252258,0.014274597,0.041137695,0.01474762,0.037200928,-0.011558533,-0.0034618378,-0.01675415,-0.0028133392,-0.012649536,0.011444092,0.014892578,-0.0041122437,0.0016384125,0.0016946793,0.021270752,-0.016052246,-0.010543823,0.028060913,0.0045661926,-0.029083252,0.03805542,0.014328003,0.009284973,-0.006046295,-0.016540527,0.018829346,0.032836914,0.0025615692,0.008148193,-0.000039041042,0.008781433,-0.012710571,0.018844604,0.015594482,-0.020446777,-0.035491943,-0.020050049,-0.030899048,0.014335632,0.00061416626,0.021942139,0.0056915283,0.010284424,-0.023208618,-0.022613525,-0.02545166,0.023742676,-0.0045280457,-0.014770508,-0.014450073,0.010971069,0.023132324,-0.032806396,-0.005947113,-0.04562378,-0.018081665,-0.012763977,-0.032348633,0.01689148,0.0064315796,-0.007575989,0.012672424,-0.0068969727,-0.008522034,0.0039901733,0.034973145,-0.015327454,-0.0006313324,0.018554688,0.00983429,-0.024368286,0.015357971,-0.007858276,-0.010894775,0.01939392,-0.016342163,0.0073509216,-0.015808105,0.035369873,0.013519287,-0.004535675,0.034332275,-0.005634308,0.011978149,-0.011756897,-0.008651733,0.001367569,-0.008262634,0.038970947,-0.011268616,-0.029922485,0.010231018,-0.015609741,-0.034118652,0.009437561,0.028427124,0.03955078,-0.016159058,0.042236328,-0.016525269,-0.012550354,0.013290405,0.014312744,-0.018295288,-0.0012350082,0.032287598,0.012527466,-0.009719849,0.006565094,-0.013198853,-0.03955078,-0.009468079,0.020019531,-0.009780884,-0.009391785,0.009307861,0.014335632,0.042907715,0.002210617,0.014511108,0.02456665,0.00856781,0.026748657,-0.008422852,0.059417725,0.0011043549,-0.034576416,0.004245758,0.0055122375,-0.01689148,-0.014190674,-0.0036525726,0.0034446716,-0.034362793,0.00793457,-0.00187397,0.041809082,-0.018569946,0.00680542,-0.019958496,-0.005558014,-0.039916992,0.002407074,-0.029006958,0.015380859,0.03677368,0.011741638,0.0050239563,0.00440979,-0.020477295,0.029647827,0.04699707,-0.008346558,-0.026412964,-0.0077056885,0.016723633,-0.012611389,0.0012598038,0.010414124,-0.017364502,-0.003107071,-0.0050468445,-0.019744873,0.012687683,-0.016555786,0.012557983,-0.0019779205,-0.003583908,-0.0027313232,0.02178955,0.012329102,-0.009979248,0.0023288727,0.0016336441,0.036224365,0.037902832,-0.0051727295,0.014228821,0.020904541,-0.03111267,0.049041748,-0.004047394,0.02468872,-0.021316528,0.005065918,-0.033721924,-0.015151978,-0.011520386,-0.0005726814],"createdAt":"2026-04-18T18:44:44.762Z","updatedAt":"2026-04-24T02:32:12.629Z","lastSeenAt":"2026-04-24T02:32:12.629Z","tsv":"'/api':213 '/api/v1/charges/240':61,178 '/docs':212 '/pricing':214 '/readme':216 '0.02':10,28,97,168 '000':87 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':77 '20':86 '402':255 '6':92 'Base network API' 'USDC micropayment API' 'accept':68,264 'access':6,24,66,195 'across':126 'actual':261 'addit':227 'advertis':124 'ai':136 'amount':83 'analysi':140 'analyt':130 'api':5,17,23,35,46,65,101,194 'attach':112 'avail':242,270 'base':8,26,55,79,88 'base-network' 'beyond':263 'broader':122 'call':45 'caller':110 'categori':128 'challeng':257 'classif':143 'clear':181 'commit':107 'confirm':250 'connect':222 'content':229 'contract':76 'convers':160 'crawl':245 'crypto-gated endpoint' 'data':129,133,202 'decim':93 'descript':190 'document':199,207 'embed':144 'endpoint':47,59,125,164,174,248 'equal':96 'estim':154 'exampl':241 'exchang':149 'export':134 'extrem':209 'feed':148 'financ':145 'four':127 'function':204 'gas':153 'gate':3,21,48 'generat':161 'geocod':158 'header':117 'howev':171 'infrastructur':156 'insight':135 'key':18,36,102 'label':63 'learn':138 'limit':104 'list':163,176 'live':251 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':137 'map':182 'materi':246 'maximum':82 'metric':131 'name':187 'network':56 'no-api-key' 'offer':38 'openapi':233 'page':217 'pay':9,27,43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':71,116,265 'per':11,29,44,98,169 'platform':123 'post':69 'post-endpoint' 'premium':4,22,64,193 'premium API access' 'price':147,166 'prompt':224 'protocol':52 'quot':152 'rate':103,150 'render':219 'report':132 'request':12,30,70,99,120,170 'request/response':236 'requir':84,109 'return':206,252 'schema':237 'sentiment':139 'servic':188 'settl':73 'simpli':111,192 'sourc':271 'spars':210 'spec':234 'specif':58,173 'suit':40 'summar':142 'technic':228 'text':141 'token':151 'unit':89 'unknown':267 'upfront':106 'usag':240 'usdc':14,32,75,95 'usdc-settlement' 'util':157 'valid':159,254 'wallet':223 'web3':146 'x':115 'x-payment':114 'x402':2,20,51,256 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"0da9d84b-07b1-46b2-a1f2-30fc5e5a6e45","listingId":"45726ebc-73af-488e-bd88-0112ba428ffe","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/240","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:44.762Z"}],"sources":[{"listingId":"45726ebc-73af-488e-bd88-0112ba428ffe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/240","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:44.762Z","lastSeenAt":"2026-04-24T02:32:12.629Z"}],"details":{"listingId":"45726ebc-73af-488e-bd88-0112ba428ffe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/240 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/240"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/240"},{"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 lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per API call without needing API keys or subscriptions","Integrating x402-compatible agents with low-cost endpoints on Base","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-request API access","Low-cost micropayment API consumption on Base L2"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas","Anyone needing non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.549Z"},"updatedAt":"2026-04-24T02:32:12.629Z"}}