{"id":"9c436620-28d7-43b8-8d01-afba2d817d63","shortId":"9z4fss","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/invoices/11` is labeled \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.\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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/invoices/11` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond the label itself.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API access","serverless API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","The specific purpose of /api/v1/invoices/11 ('Premium API Access') is undocumented — unclear what it returns","No request or response examples available anywhere on the site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/11","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/invoices/11","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 pricing and network. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs ('Connect wallet'). The purpose of the specific /api/v1/invoices/11 endpoint is unclear beyond its label. 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":"2026-04-18T22:45:55.445Z","embedding":[-0.024841309,-0.029220581,0.035858154,-0.0076522827,0.027816772,-0.030639648,-0.035491943,0.034057617,0.072021484,-0.07684326,0.024047852,-0.05392456,-0.03186035,-0.035858154,-0.015625,0.021911621,-0.001871109,0.01210022,-0.043395996,0.042114258,0.025344849,-0.0033454895,-0.041503906,0.027648926,-0.008003235,-0.021591187,-0.018188477,-0.00793457,-0.01360321,-0.048034668,0.03265381,-0.034057617,0.009742737,0.011352539,-0.0049476624,-0.015556335,0.0032749176,0.044647217,0.025909424,-0.0047416687,-0.008270264,-0.04699707,0.002571106,-0.012886047,-0.05065918,-0.004589081,0.01638794,-0.01701355,-0.0059890747,0.001958847,-0.050994873,0.01285553,-0.005317688,-0.007320404,0.013755798,0.016479492,-0.00541687,-0.0050354004,0.0009264946,0.00095415115,0.015914917,-0.052368164,-0.026626587,-0.0019302368,-0.0031967163,0.063964844,-0.01725769,0.052764893,0.020721436,0.050109863,0.030776978,0.06036377,0.024032593,0.014930725,0.0035190582,-0.011520386,-0.007671356,0.06414795,-0.013999939,-0.0076789856,-0.012275696,0.006137848,-0.047546387,-0.006629944,-0.016296387,-0.05291748,-0.030685425,0.005027771,-0.028869629,0.022964478,-0.07537842,0.001657486,-0.011497498,-0.008895874,0.01966858,0.0000069737434,-0.008178711,0.024963379,-0.023925781,0.02418518,0.0073661804,-0.035858154,0.005973816,0.01713562,0.03616333,0.05319214,0.021911621,0.016159058,0.0047912598,-0.0236969,-0.043701172,0.0071907043,-0.020004272,-0.026245117,-0.015640259,0.011390686,-0.042053223,0.0025367737,-0.018478394,-0.0023212433,-0.051727295,0.05795288,0.01991272,-0.006000519,0.0041389465,-0.052703857,-0.019241333,0.010871887,-0.017578125,-0.005771637,0.02571106,0.021606445,0.038116455,-0.020233154,-0.030456543,0.009490967,-0.011299133,-0.014595032,-0.04348755,-0.041381836,0.03918457,-0.017791748,0.021514893,0.019943237,-0.103637695,-0.0065345764,-0.04953003,0.0001603365,-0.034088135,-0.0023727417,-0.021911621,0.033477783,-0.036987305,-0.027435303,-0.026687622,-0.010528564,-0.00006908178,0.031311035,-0.01638794,0.053619385,-0.018951416,0.024215698,0.019165039,0.005168915,0.020050049,0.024658203,-0.0019893646,-0.08203125,-0.0770874,-0.027282715,-0.0052986145,-0.0077209473,-0.023757935,0.0042152405,0.0058403015,-0.0690918,-0.016937256,-0.01789856,0.0061073303,-0.042419434,-0.0016269684,-0.021011353,-0.0010690689,-0.007835388,-0.049224854,-0.022201538,-0.028137207,0.058807373,0.02407837,0.034729004,0.03274536,-0.01713562,0.052001953,0.038116455,-0.015357971,-0.025039673,0.0032672882,-0.005847931,0.015235901,-0.00086069107,0.0050735474,-0.03277588,0.0473938,0.06378174,0.013702393,-0.019226074,-0.007926941,-0.055419922,-0.051116943,-0.028869629,0.024261475,0.024719238,0.0009741783,0.03515625,-0.03768921,-0.044769287,-0.00012177229,0.009353638,0.024017334,0.06915283,0.0158844,0.00024104118,0.012924194,0.02029419,-0.029510498,0.03729248,0.032470703,0.0143585205,-0.029464722,-0.034820557,0.018463135,0.04458618,-0.029724121,0.020950317,-0.02279663,0.019821167,-0.0069274902,0.010040283,0.021087646,-0.0012760162,-0.023284912,-0.02961731,-0.026519775,0.036224365,0.020004272,-0.022323608,-0.036590576,-0.062683105,0.045013428,0.035858154,0.04159546,-0.009475708,0.008354187,-0.021957397,-0.015159607,-0.08428955,0.042053223,0.07318115,-0.01826477,-0.0019369125,0.021087646,-0.002811432,-0.029067993,0.020126343,-0.0047302246,-0.022323608,-0.016937256,0.014930725,-0.045288086,0.0015993118,0.009635925,0.041870117,0.063964844,-0.012207031,-0.054870605,-0.021057129,0.0011777878,-0.0046844482,-0.025741577,0.015731812,-0.008201599,0.010498047,0.030181885,0.010734558,0.023590088,-0.00016605854,0.017791748,0.000500679,-0.0010213852,-0.015808105,-0.029403687,0.017593384,0.006504059,-0.068603516,0.015777588,-0.011024475,0.06958008,-0.054595947,0.043792725,-0.006088257,0.03390503,0.03781128,-0.007160187,-0.030883789,0.015304565,0.037017822,0.0020313263,0.046447754,0.010635376,-0.016738892,0.0053710938,0.068481445,-0.02482605,-0.004951477,0.016403198,0.02053833,0.039398193,-0.0118255615,-0.041107178,-0.037109375,-0.01108551,-0.02670288,0.028427124,-0.015281677,0.025344849,-0.014755249,0.010887146,-0.020462036,-0.012878418,-0.02230835,0.025878906,-0.013786316,-0.008102417,-0.012802124,-0.025436401,0.011001587,0.016845703,-0.0038528442,-0.0046844482,0.041503906,0.02279663,-0.026062012,-0.0501709,-0.027893066,-0.014518738,0.010520935,0.02230835,0.027053833,0.021102905,0.055877686,-0.029830933,0.009628296,0.022628784,0.016326904,0.03152466,0.0025978088,0.019256592,-0.06616211,-0.05178833,-0.027786255,-0.054351807,0.025848389,0.019119263,0.0046195984,0.049316406,0.0031738281,-0.010375977,-0.029754639,0.011909485,-0.0435791,0.015197754,0.04852295,-0.008644104,-0.029754639,-0.0068588257,-0.008453369,-0.008895874,0.037628174,0.011405945,0.012916565,0.06677246,0.037475586,-0.0030097961,0.021591187,0.030929565,0.02760315,0.0082092285,-0.016143799,-0.018478394,0.008407593,0.028762817,-0.027297974,-0.029388428,-0.068603516,0.052978516,0.031066895,0.062561035,0.009307861,0.010475159,0.040527344,-0.0029354095,0.023391724,-0.025604248,-0.016067505,-0.034484863,-0.03878784,0.039642334,-0.020629883,0.0025978088,-0.023864746,0.037017822,-0.008934021,0.011276245,-0.020889282,0.04272461,-0.009651184,0.014198303,0.02709961,-0.004184723,0.05722046,0.04699707,-0.0418396,0.025405884,0.012756348,-0.036010742,0.007484436,0.045410156,-0.023406982,-0.02508545,-0.070739746,-0.036132812,-0.0078125,-0.0031433105,-0.057922363,-0.0059318542,-0.006954193,0.015335083,0.026519775,-0.003660202,-0.015335083,0.013717651,-0.031585693,-0.06750488,0.010231018,-0.047027588,0.0026855469,0.033233643,-0.022201538,-0.003490448,-0.004753113,-0.0061836243,0.002111435,-0.0012102127,0.017623901,0.003616333,-0.052947998,0.03164673,0.012321472,0.00121212,0.00818634,0.019058228,0.022659302,0.008262634,0.061584473,0.015625,-0.027542114,-0.06439209,0.01007843,-0.04989624,-0.00027799606,-0.0014238358,-0.029922485,0.0051574707,-0.007358551,-0.034118652,-0.02772522,0.006149292,-0.022872925,0.004081726,0.024551392,-0.025268555,-0.028457642,-0.053497314,-0.016799927,-0.0044136047,0.06628418,0.019058228,-0.012008667,-0.060424805,-0.005844116,0.013404846,0.005531311,0.027236938,-0.015266418,-0.0060272217,-0.0099487305,-0.03451538,-0.0011177063,-0.01625061,0.02204895,-0.002790451,-0.01637268,0.039123535,0.0024852753,0.014625549,0.007106781,0.01008606,0.024490356,-0.026351929,-0.012504578,-0.0104522705,0.04336548,0.01007843,-0.006526947,-0.05166626,0.05908203,0.016235352,0.03942871,-0.039276123,-0.016357422,-0.009002686,0.0056419373,0.017623901,-0.016799927,-0.00076150894,-0.0107803345,-0.055145264,-0.052703857,0.028793335,-0.016403198,0.03186035,0.0079193115,0.007259369,0.020187378,-0.006504059,0.013999939,0.025100708,-0.027709961,-0.00415802,-0.014595032,-0.03274536,-0.00774765,-0.002462387,-0.01423645,0.026657104,-0.022018433,0.015357971,-0.0104599,-0.031097412,0.036102295,0.008483887,0.0033283234,0.03164673,0.0054359436,0.016342163,0.044769287,0.012306213,-0.0385437,0.030853271,-0.002286911,0.022583008,-0.010414124,0.036590576,0.023284912,-0.0143966675,0.00009590387,-0.0005083084,-0.02180481,-0.013465881,-0.0014343262,0.011444092,0.022781372,0.0020637512,-0.049713135,0.027709961,0.009155273,-0.007686615,-0.027938843,0.009216309,0.013458252,-0.042938232,0.013504028,0.017440796,0.06982422,-0.023086548,0.018951416,0.011146545,0.037902832,0.03164673,0.016662598,-0.014503479,0.021102905,-0.0030555725,0.00094509125,-0.0026741028,-0.010513306,0.020477295,-0.00071907043,0.03111267,0.034332275,0.0141067505,-0.01737976,-0.023162842,0.00831604,-0.019561768,-0.008155823,0.027542114,0.033111572,0.024368286,-0.034332275,0.0209198,0.015670776,-0.012054443,-0.021469116,-0.01727295,0.043701172,-0.025482178,-0.016845703,0.009986877,0.012237549,0.031280518,-0.05899048,-0.011489868,0.009902954,0.013008118,-0.01689148,-0.032196045,-0.04537964,0.0035495758,0.030136108,0.0074539185,0.032196045,0.03717041,0.005622864,0.005344391,0.023498535,0.0041770935,-0.011909485,-0.010559082,-0.047943115,-0.024368286,0.007118225,0.004501343,-0.03475952,0.020950317,-0.014678955,-0.028747559,0.007980347,-0.013702393,-0.007888794,-0.015991211,0.010475159,0.025390625,0.0011119843,0.01638794,-0.006259918,-0.027832031,0.0006246567,0.007598877,0.027038574,-0.04574585,0.0105896,-0.009010315,-0.0025367737,-0.009025574,0.00868988,0.019470215,0.028900146,0.010108948,0.04232788,-0.0446167,0.04650879,-0.027755737,0.018432617,0.008552551,-0.02861023,-0.011245728,-0.023742676,-0.007865906,0.04257202,-0.019897461,-0.01550293,-0.023727417,-0.02571106,-0.0184021,-0.050231934,0.01828003,0.033843994,0.048614502,-0.024673462,0.005645752,0.009315491,0.010765076,-0.028900146,-0.0026569366,-0.012573242,0.011665344,0.031280518,0.0040245056,-0.015197754,-0.030426025,-0.012870789,0.007801056,-0.038085938,-0.047546387,-0.006980896,0.0018911362,-0.003660202,-0.013694763,-0.030929565,-0.04296875,0.011405945,-0.037719727,0.021408081,0.0079956055,0.025390625,0.010848999,-0.017471313,0.0017433167,0.014930725,-0.015792847,0.032806396,0.0051651,-0.0039482117,-0.026443481,0.0007362366,0.030349731,0.014984131,0.0032958984,-0.008895874,-0.011741638,-0.011878967,-0.05206299,-0.00018429756,-0.0005135536,-0.0088272095,-0.013580322,0.0090789795,-0.056640625,-0.0053520203,-0.028869629,-0.0085372925,0.0368042,0.029037476,0.0004477501,-0.0087890625,0.0025634766,-0.00089263916,-0.017211914,-0.038208008,0.020874023,0.011161804,0.002620697,0.027496338,0.045715332,-0.0022258759,-0.019378662,-0.0043945312,0.01222229,0.025512695,-0.018920898,0.006462097,-0.019454956,0.015235901,-0.004398346,-0.013008118,-0.040893555,0.0032539368,0.080322266,0.000014543533,-0.009986877,-0.015960693,-0.013999939,0.013641357,0.034576416,-0.039154053,-0.002023697,-0.03173828,0.025039673,-0.017211914,0.024734497,0.0011396408,0.018661499,-0.032104492,-0.052886963,-0.010215759,0.0005617142,-0.020095825,-0.068603516,-0.01977539,-0.07293701,-0.0054779053,-0.007965088,-0.031341553,0.0038757324,0.01234436,-0.017669678,-0.080200195,0.017578125,0.053009033,-0.0045280457,0.029724121,-0.0075645447,0.022994995,0.036224365,-0.032104492,-0.008560181,0.034240723,-0.030883789,-0.01914978,-0.019454956,0.022903442,-0.0116119385,-0.014839172,0.027328491,0.011192322,0.022277832,-0.0073127747,0.01058197,-0.014411926,0.01852417,-0.018188477,0.022247314,-0.00919342,-0.01713562,0.04727173,-0.064819336,0.019012451,0.0035533905,0.0022773743,0.002696991,0.041992188,0.042663574,-0.036010742,-0.021713257,0.03149414,0.017990112,0.031555176,-0.025421143,0.044006348,0.018859863,-0.023773193,0.019729614,0.0009918213,-0.01625061,-0.040893555,-0.025360107,0.029571533,0.0042304993,0.012718201,-0.014282227,-0.002483368,0.016357422,0.00003325939,0.00605011,-0.02482605,-0.01940918,-0.016723633,-0.00067710876,0.0045547485,0.006187439,0.0012168884,0.02796936,0.029464722,0.032073975,0.0076675415,-0.015335083,0.018112183,0.026687622,-0.015823364,0.0008149147,0.024368286,0.0032978058,0.020645142,0.017059326,0.004764557,-0.037841797,0.0017280579,-0.03225708,-0.008468628,-0.0015745163,-0.0107421875,-0.0017967224,-0.003932953,-0.0030155182,-0.011421204,-0.02633667,0.011909485,-0.03186035,-0.028640747,-0.008872986,0.004737854,0.02519226,0.0018062592,0.009788513,0.01789856,0.0033855438,0.0552063,0.0031414032,0.0013113022,0.029174805,0.03451538,0.020568848,-0.028869629,-0.0054512024,-0.0053749084,0.0016736984,-0.000097453594,-0.042541504,0.014785767,0.04815674,-0.009101868,0.0037555695,-0.00447464,0.019714355,-0.0140686035,0.005973816,-0.008102417,0.015625,-0.014640808,0.030288696,-0.028213501,0.0040130615,0.013717651,0.010238647,0.0048332214,-0.018005371,-0.034301758,0.01574707,0.0030174255,0.0006957054,0.050811768,-0.0065345764,0.027038574,-0.032196045,-0.016967773,0.0023460388,-0.031402588,-0.026031494,0.024047852,-0.0074005127,-0.0008740425,0.0069274902,-0.025177002,0.027435303,-0.030471802,0.02243042,-0.0015611649,0.0073661804,-0.01373291,-0.01474762,-0.025314331,0.004753113,-0.011978149,-0.0023021698,-0.0030174255,0.050567627,0.016098022,0.033691406,0.039276123,0.0124053955,-0.0035305023,-0.03881836,-0.035858154,-0.004764557,-0.017913818,0.014266968,-0.017028809,0.051635742,0.03387451,0.012466431,0.037261963,0.033996582,0.033691406,-0.009613037,0.014823914,-0.022323608,0.0043258667,-0.007873535,0.024307251,0.003004074,0.035369873,-0.020935059,0.022018433,0.016342163,0.033050537,-0.02494812,0.040161133,0.06500244,0.018539429,-0.003168106,0.02142334,0.0025691986,-0.013595581,-0.015342712,-0.019058228,0.072265625,0.027191162,0.053375244,0.04751587,0.0032310486,-0.0027332306,0.020965576,-0.03137207,-0.02583313,0.07232666,0.019973755,-0.024673462,-0.0115737915,-0.0005030632,0.00034832954,-0.05886841,-0.0155181885,0.017562866,0.012809753,0.008964539,-0.007217407,-0.0068740845,-0.010108948,0.010475159,0.020477295,0.0045814514,-0.014801025,0.02532959,0.023925781,0.0032787323,0.023254395,-0.004714966,0.030929565,-0.041503906,-0.022338867,0.0024681091,0.01739502,-0.008094788,-0.0013771057,0.01763916,-0.005378723,0.04257202,0.042999268,-0.018463135,0.0026283264,0.032348633,0.010169983,0.016052246,0.059143066,0.025177002,0.01260376,0.042144775,0.034057617,0.025604248,-0.0473938,0.019546509,0.003522873,0.0060806274,-0.007633209,-0.021133423,-0.0038089752,-0.017684937,0.01586914,-0.0009021759,-0.013038635,0.020935059,0.031555176,0.0013580322,0.00083971024,-0.005722046,0.003370285,-0.012062073,-0.017974854,0.014373779,-0.008514404,0.025604248,0.013221741,0.029815674,-0.020584106,0.022949219,-0.014732361,-0.016342163,-0.0011053085,0.027938843,-0.036834717,0.0044670105,-0.006893158,-0.0008955002,-0.050079346,0.0071144104,0.031341553,-0.0040283203,0.024353027,0.017562866,0.0038967133,-0.0076522827,0.026275635,0.014785767,-0.0006418228,-0.011428833,-0.027008057,0.03302002,0.054534912,0.007911682,0.02168274,-0.017242432,0.007511139,-0.000053942204,0.00006657839,-0.0008749962,-0.0010480881,-0.016235352,-0.013221741,0.009529114,0.036376953,0.010475159,0.04949951,-0.008369446,-0.024963379,0.0087890625,0.02949524,0.01525116,0.004928589,0.010635376,0.01991272,-0.008705139,0.031173706,0.0395813,0.008575439,0.02116394,-0.013397217,-0.008468628,0.010070801,-0.013618469,0.029296875,-0.017822266,0.010475159,-0.010765076,0.027786255,-0.010543823,-0.044403076,0.007457733,-0.020889282,-0.017166138,-0.026473999,0.016204834,-0.005947113,0.021148682,0.03201294,0.01386261,-0.0395813,0.062927246,-0.019577026,0.05328369,-0.003955841,-0.0077056885,0.05142212,0.03475952,0.03543091,0.018966675,0.017349243,-0.033294678,0.019180298,0.049926758,0.023468018,0.009391785,0.0035095215,-0.02331543,0.034179688,-0.0047454834,0.026611328,-0.01361084,0.0023956299,0.012840271,-0.0054626465,-0.0014219284,-0.0033779144,-0.0041770935,0.009902954,0.053497314,-0.029083252,-0.016067505,-0.016555786,-0.0075263977,0.028244019,-0.009231567,0.007820129,-0.004261017,-0.032226562,0.0119018555,-0.025466919,-0.025390625,0.0074653625,0.026870728,-0.03845215,-0.022033691,0.005039215,0.018478394,-0.026733398,0.023757935,0.015586853,-0.013557434,0.016174316,0.036315918,-0.0043640137,0.021484375,-0.015655518,0.016571045,0.0368042,-0.0038089752,-0.0112838745,-0.008544922,0.005958557,-0.008583069,0.0059509277,0.030578613,-0.009788513,-0.0010890961,0.010368347,-0.013702393,-0.0033721924,0.009643555,-0.00009602308,0.0049476624,-0.004508972,-0.0016832352,0.0035266876,0.008842468,0.0019741058,0.007911682,-0.011665344,-0.010528564,0.012062073,0.03262329,0.027648926,-0.030426025,-0.00049972534,0.0073661804,0.0037498474,-0.020339966,-0.016921997,-0.012481689,-0.02810669,0.02015686,0.014587402,0.009017944,0.020233154,-0.025772095,0.01878357,0.0335083,0.016860962,0.009216309,0.005218506,-0.010009766,0.010063171,-0.010765076,-0.005001068,0.00031256676,-0.007499695,0.0028152466,0.024887085,0.000015437603,-0.030395508,0.020645142,-0.005241394,0.018112183,-0.0005040169,-0.011581421,0.017578125,-0.0132369995,-0.008766174,-0.007896423,0.0016069412,-0.015960693,-0.014183044,-0.0143966675,0.032196045,0.05657959,-0.01285553,-0.015266418,0.0154418945,0.008399963,0.027175903,0.036712646,0.013893127,0.04034424,0.02027893,-0.025863647,-0.01576233,0.022094727,-0.012252808,-0.02394104,0.017456055,-0.017150879,-0.010658264,0.006652832,0.010269165,-0.005821228,-0.021652222,-0.013633728,-0.017745972,-0.0158844,0.019943237,-0.0040664673,0.022247314,-0.013618469,-0.0064430237,0.003873825,-0.031951904,-0.045288086,-0.030212402,0.0011777878,-0.013130188,-0.05987549,0.010375977,-0.025665283,0.018203735,-0.019104004,0.0066604614,-0.009521484,0.0256958,-0.021087646,0.007007599,-0.0006580353,0.02279663,0.012145996,0.01234436,0.020309448,-0.03137207,-0.023376465,-0.020263672,0.004096985,-0.0057907104,0.016738892,0.0085372925,0.045928955,0.015792847,-0.016830444,0.0049209595,-0.017532349,-0.0031719208,0.0022087097,-0.026016235,-0.019638062,0.02885437,0.0135650635,0.0013122559,-0.004463196,0.045074463,-0.01789856,-0.0155181885,0.006752014,0.04510498,0.0098724365,0.028640747,-0.010597229,-0.0036830902,-0.013877869,0.0037899017,-0.010734558,0.013839722,-0.00083732605,0.00022888184,-0.00060892105,0.0007185936,0.026138306,-0.01222229,0.0023956299,0.030639648,0.014556885,-0.011520386,0.031555176,0.030136108,0.006454468,-0.019866943,-0.0019197464,0.010513306,0.049926758,0.009277344,0.012390137,0.006378174,0.0074386597,-0.010108948,0.013328552,0.001458168,-0.020217896,-0.041015625,-0.015449524,-0.032409668,0.026382446,-0.0028972626,0.014228821,-0.008529663,0.024353027,-0.013755798,-0.030853271,-0.021560669,0.027938843,0.015289307,-0.016311646,-0.008262634,0.011787415,0.024047852,-0.02835083,0.005428314,-0.048187256,-0.0335083,-0.022201538,-0.018920898,0.024505615,0.008644104,-0.002866745,0.009407043,-0.00063848495,-0.0004644394,-0.0022716522,0.02619934,-0.011497498,-0.0045928955,0.017456055,0.0079193115,-0.02255249,0.018371582,0.01084137,-0.004131317,0.005580902,-0.006904602,0.012916565,-0.015602112,0.033294678,-0.006958008,-0.0025177002,0.03640747,0.009689331,0.0051879883,-0.026733398,0.010360718,0.00035905838,0.0012454987,0.046661377,-0.028076172,-0.021057129,0.008804321,-0.011428833,-0.019454956,-0.0043258667,0.01828003,0.028045654,-0.009536743,0.0368042,-0.02078247,0.003982544,0.0071525574,0.012687683,-0.015838623,0.0058631897,0.038360596,0.00047278404,-0.0011940002,0.0065727234,-0.009429932,-0.025817871,-0.011688232,0.014785767,-0.0035953522,-0.013328552,0.018371582,0.006629944,0.04034424,0.0023479462,0.008903503,0.024856567,0.011436462,0.024520874,0.0068511963,0.03829956,0.01499939,-0.024917603,0.004966736,-0.011680603,-0.02558899,0.0015249252,0.0031661987,-0.0021915436,-0.035583496,0.004890442,-0.0056877136,0.027572632,-0.011276245,0.016403198,-0.019088745,-0.008979797,-0.030883789,-0.00009006262,-0.037200928,0.012046814,0.03930664,0.0043678284,0.020751953,0.0075645447,-0.019622803,0.030258179,0.04949951,0.0045280457,-0.022140503,-0.022628784,0.0016469955,0.00069999695,0.014915466,0.0042686462,-0.016555786,-0.022247314,-0.00004118681,-0.013771057,0.0050201416,-0.0042877197,0.008735657,-0.006336212,-0.0021419525,-0.008056641,0.02015686,-0.012008667,0.0022239685,-0.00116539,-0.005378723,0.03237915,0.027923584,-0.0049209595,0.026641846,0.016525269,-0.03036499,0.057739258,-0.006793976,0.042297363,-0.015586853,0.015609741,-0.040374756,-0.023666382,-0.009246826,0.0059776306],"createdAt":"2026-04-18T18:36:49.313Z","updatedAt":"2026-04-23T15:00:46.019Z","lastSeenAt":"2026-04-23T15:00:46.019Z","tsv":"'/api/v1/invoices/11':65,190 '/call':19,38 '/request':152 '0.02':18,37,73,151 '000':77 '20':76 '402':201 '6':83 'Base network API' 'USDC API' 'access':70,215 'account':98 'actual':192 'advertis':107 'ai':12,31,119 'ai-inference' 'analysi':123 'analyt':113 'api':5,24,48,69,96,160,214 'base':8,27,57,78 'base-network' 'beyond':217 'broader':105 'call':75 'categori':109 'challeng':202 'classif':126 'collect':42 'connect':169 'content':175 'convers':143 'cost':72 'crypto API access' 'data':11,30,112,116,210 'data-analytics' 'decim':84 'descript':186 'doc':159 'document':154,205 'embed':127 'endpoint':16,35,49,63,111,147,191,195 'estim':137 'exampl':183 'exchang':132 'export':117 'extrem':156 'feed':131 'financ':13,32,128 'finance-data' 'four':108 'function':212 'gas':136 'generat':144 'geocod':141 'handl':87 'header':94 'infrastructur':139 'inlin':88 'insight':118 'key':97 'label':67,219 'learn':121 'limit':101 'list':146 'live':197 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':120 'metric':114 'micropayment API' 'network':58 'no-api-key' 'offer':40 'openapi':179 'page':164 'pay':2,21,45 'pay per call API' 'pay-per-request':1,20,44 'payment':85,93 'per':3,22,46,74 'platform':106 'premium':68,213 'price':130,153,161 'prompt':171 'protocol':54 'provid':216 'quot':135 'rate':100,133 'readm':163 'render':166 'report':115 'request':4,23,47 'request/response':182 'requir':103 'return':193,198 'schema':180 'sentiment':122 'serverless API' 'settl':50 'share':148 'spars':157 'specif':62 'substant':174 'suit':6,25 'summar':125 'text':124 'token':134 'unclear':208 'unit':79 'usdc':60,81 'usdc-settlement' 'use':59 'util':15,34,140 'utility-services' 'valid':142,200 'via':9,28,51,89 'wallet':170 'web3':129 'without':204 'x':92 'x-payment':91 'x402':10,29,53 'x402 API' 'x402-payment'","prices":[{"id":"8bdde2f1-2faf-4f02-a64c-c69014f8898f","listingId":"9c436620-28d7-43b8-8d01-afba2d817d63","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/invoices/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:49.313Z"}],"sources":[{"listingId":"9c436620-28d7-43b8-8d01-afba2d817d63","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:49.313Z","lastSeenAt":"2026-04-23T15:00:46.019Z"}],"details":{"listingId":"9c436620-28d7-43b8-8d01-afba2d817d63","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/11 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/11"},{"claim":"All listed 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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/invoices/11"}],"useCases":["Accessing data analytics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding, validation, and data conversion utilities"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","Agents that can settle x402 payments in USDC on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.642Z"},"updatedAt":"2026-04-23T15:00:46.019Z"}}