{"id":"e8f36eb4-4831-4f7a-b01e-46590cac8bdb","shortId":"xQBkPT","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource path `/api/v1/transactions/298/receipt`) behind an x402 paywall. The site advertises itself as a platform hosting multiple pay-per-call API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint probed returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) sent to address 0x1A2B…85F3. The payment timeout is 300 seconds. The endpoint accepts HTTP POST and returns `application/json`. However, the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" stub with no further technical detail, so the actual response schema, request parameters, and the nature of the \"receipt\" data are unknown.\n\nThe broader lowpaymentfee.com platform lists 16 endpoints across analytics, AI inference (sentiment, summarization, classification, embeddings), finance (price feeds, exchange rates, token quotes, gas estimates), and utilities (geocoding, validation, conversion, generation), all at the same $0.02/request price point. No OpenAPI spec, no detailed docs, and no example payloads were found during the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paywall endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' stub with no usable content.","No OpenAPI or schema available — request parameters and response format are completely unknown.","The specific resource '/api/v1/transactions/298/receipt' appears to be a single hardcoded transaction ID; unclear if this generalizes to other transaction IDs.","The platform lists 16 endpoints across diverse categories but provides zero technical documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/298/receipt","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/transactions/298/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a well-formed x402 challenge with clear pricing, but there is no OpenAPI spec, no documentation beyond stubs, no request/response schema, and the purpose of the 'transaction receipt' data is unexplained. The broader site lists many endpoints but provides no technical detail for any of them.","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":"2026-04-19T13:08:34.697Z","embedding":[-0.041107178,-0.032714844,0.04144287,0.008773804,0.0087509155,-0.019165039,-0.0151901245,0.031799316,0.058288574,-0.07019043,0.022537231,-0.039855957,-0.02809143,-0.030349731,-0.016052246,0.01939392,0.007686615,0.019622803,-0.05441284,0.038482666,0.03250122,-0.047027588,-0.030151367,0.025482178,-0.0096588135,-0.006149292,-0.01272583,-0.012680054,-0.045440674,-0.031402588,0.03567505,-0.021087646,-0.03289795,0.0013151169,-0.009399414,0.019012451,-0.011169434,0.022827148,0.042053223,-0.019592285,-0.012069702,-0.05130005,0.013916016,-0.010475159,-0.038513184,-0.007019043,0.0015277863,-0.021331787,0.005924225,-0.0046958923,-0.044555664,-0.012634277,-0.012741089,0.011680603,0.0076141357,0.009681702,0.012466431,0.010643005,0.02217102,0.0028572083,-0.005744934,-0.06878662,-0.0032749176,-0.014457703,0.012802124,0.059387207,-0.0066452026,0.04434204,0.017929077,0.06793213,0.03475952,0.056030273,0.05166626,0.01737976,0.019714355,-0.016220093,-0.00023710728,0.020202637,-0.044799805,-0.018234253,0.015571594,-0.025726318,-0.07659912,-0.0056419373,-0.022033691,-0.06518555,-0.023803711,0.014823914,-0.024673462,0.046447754,-0.08288574,-0.0026016235,0.013893127,0.026123047,-0.0047721863,-0.029754639,-0.03668213,-0.012107849,-0.003293991,0.0051002502,-0.0020656586,-0.04949951,0.039245605,-0.0031204224,0.04324341,0.025665283,0.009796143,0.01235199,0.010467529,0.0051841736,-0.00248909,0.024047852,0.0019569397,-0.018798828,0.030670166,-0.012283325,-0.022201538,0.035858154,-0.028549194,0.038116455,-0.053833008,0.06286621,-0.0037517548,-0.01285553,-0.0011968613,-0.044433594,-0.019348145,0.008201599,-0.030731201,-0.0135650635,0.03753662,0.023330688,-0.008544922,-0.014945984,-0.013114929,0.0050468445,-0.008491516,-0.019638062,-0.03555298,-0.018936157,0.029327393,-0.043945312,0.011657715,0.045776367,-0.07434082,0.0024051666,-0.053619385,0.008872986,-0.026031494,-0.020385742,0.018737793,0.010818481,-0.016143799,-0.024612427,-0.015319824,-0.029205322,-0.00466156,0.045410156,-0.017364502,0.015823364,-0.02822876,0.033416748,0.022537231,0.019042969,0.019500732,0.03652954,-0.015136719,-0.07397461,-0.091918945,0.0028305054,0.010986328,-0.025009155,-0.031173706,-0.005306244,-0.03326416,-0.079589844,-0.022384644,0.004623413,0.010650635,-0.04815674,-0.0069122314,-0.03616333,0.01209259,-0.019470215,-0.040008545,-0.025299072,-0.028945923,0.061035156,0.031951904,0.039886475,0.011680603,0.0032730103,0.052703857,0.02557373,-0.009880066,-0.03250122,0.01600647,-0.02494812,0.040649414,-0.002029419,0.010314941,-0.024887085,0.023635864,0.07299805,-0.010185242,-0.026611328,0.008514404,-0.03881836,-0.036499023,-0.020721436,0.027252197,0.019058228,-0.011268616,0.018096924,-0.049316406,-0.013076782,0.009552002,0.015571594,0.018096924,0.052886963,0.017837524,0.013198853,0.014045715,0.030700684,-0.032836914,0.049346924,0.030883789,0.011016846,-0.018310547,-0.04373169,0.030700684,0.03125,-0.026489258,0.010498047,-0.007209778,0.037475586,0.0026283264,0.008460999,0.020355225,-0.013290405,-0.0284729,-0.01991272,0.011604309,0.01725769,0.006439209,-0.014533997,-0.059814453,-0.085876465,0.059295654,0.050933838,0.014808655,0.0032291412,-0.00881958,-0.026229858,-0.015045166,-0.07513428,0.043762207,0.06530762,-0.0054473877,-0.027786255,0.04269409,-0.009506226,-0.04168701,-0.0026416779,-0.012374878,-0.027359009,0.0029621124,-0.0028305054,-0.039611816,0.013420105,-0.0062217712,0.0129776,0.05130005,-0.009254456,-0.046020508,-0.012214661,-0.012107849,0.019180298,-0.03540039,-0.010978699,0.006225586,0.019577026,0.012542725,0.026168823,-0.0060310364,0.021316528,0.007331848,-0.018554688,0.005378723,-0.012214661,-0.030166626,0.007293701,-0.0001770258,-0.049926758,-0.000084757805,-0.00043201447,0.056671143,-0.054351807,0.030593872,-0.03164673,0.013824463,0.049316406,0.004184723,-0.060455322,0.015098572,0.033691406,0.019607544,0.040771484,0.03012085,0.008323669,-0.028411865,0.06695557,-0.015914917,0.00007081032,0.0075035095,0.014839172,0.04058838,-0.007549286,-0.044067383,-0.056518555,0.016784668,-0.0234375,0.0345459,-0.010375977,0.04510498,-0.006095886,0.017501831,-0.0309906,-0.0010766983,-0.02696228,0.00774765,0.0003619194,0.0029506683,-0.031066895,-0.033966064,0.019729614,0.000729084,-0.009391785,0.0074501038,0.057922363,0.0054397583,-0.015609741,-0.025665283,-0.021057129,-0.02468872,-0.0076828003,0.030380249,0.022399902,0.011199951,0.044311523,-0.028915405,0.018798828,0.028915405,-0.003501892,0.031021118,0.007282257,0.0037841797,-0.05883789,-0.03604126,-0.009391785,-0.041107178,0.03338623,0.032684326,0.002822876,0.06677246,0.012260437,-0.032714844,-0.028289795,0.04296875,-0.041107178,0.014533997,0.040008545,-0.008300781,-0.031143188,-0.009391785,0.0033416748,0.0029888153,0.038970947,0.021743774,0.029312134,0.06677246,0.039916992,0.008705139,0.009506226,0.019577026,0.031921387,-0.005016327,-0.004146576,-0.032714844,-0.034179688,0.026153564,-0.04421997,-0.0289917,-0.06958008,0.048339844,0.038726807,0.07720947,0.006462097,0.013801575,0.042633057,0.0039024353,0.01360321,-0.014442444,-0.01651001,-0.044281006,-0.020996094,0.026992798,-0.011520386,0.006755829,-0.01713562,0.012924194,0.014167786,0.0069007874,-0.03604126,0.053497314,-0.019500732,-0.017532349,0.024673462,0.026885986,0.039245605,0.044891357,-0.02470398,0.004135132,0.03326416,-0.036193848,0.020477295,0.025909424,-0.009338379,-0.004852295,-0.05026245,-0.03250122,-0.0019931793,-0.012878418,-0.05618286,0.0073280334,-0.0022392273,0.027313232,0.033477783,-0.035003662,-0.04055786,0.0049057007,-0.012229919,-0.035247803,0.00920105,-0.043304443,0.010917664,0.030639648,-0.036346436,0.022888184,-0.0115356445,0.0059509277,-0.021697998,0.0054244995,0.009490967,-0.01071167,-0.031921387,0.03503418,-0.00434494,0.009223938,0.004131317,0.033966064,0.013946533,0.03552246,0.033294678,0.022064209,-0.01802063,-0.048095703,0.04067993,-0.04006958,-0.0017557144,0.03491211,-0.021896362,-0.0048065186,-0.00005441904,-0.02519226,-0.0289917,0.0181427,-0.019042969,0.00029826164,0.01789856,-0.032836914,-0.02053833,-0.055419922,-0.031311035,-0.0058898926,0.064941406,0.0062561035,0.0017642975,-0.05645752,-0.010108948,0.0390625,0.0041389465,0.02104187,-0.014862061,-0.019821167,-0.005306244,-0.02407837,-0.02494812,-0.030227661,0.036621094,-0.005962372,-0.00434494,0.0037841797,0.014862061,0.000074625015,0.0069084167,-0.016235352,0.025039673,-0.011550903,-0.020874023,-0.0071487427,0.02671814,0.004295349,-0.022247314,-0.032348633,0.03970337,-0.010154724,0.035125732,-0.03604126,-0.004714966,0.0013046265,0.014442444,0.0018434525,-0.011184692,-0.0049743652,0.0024547577,-0.029785156,-0.066345215,0.0435791,-0.018798828,0.03677368,0.032104492,0.018127441,0.03149414,-0.02357483,0.008766174,0.0038661957,-0.038848877,-0.031799316,-0.035980225,-0.027313232,-0.022827148,-0.0061073303,-0.024398804,0.010696411,-0.0058135986,0.0074386597,-0.019348145,-0.027542114,0.03591919,0.0012979507,-0.0024375916,0.020141602,0.003660202,0.016601562,0.028305054,0.01776123,-0.05267334,0.026489258,-0.015716553,0.005748749,-0.009880066,0.03753662,0.028076172,-0.032073975,0.009391785,-0.0035324097,0.000957489,-0.01965332,-0.0037460327,0.0035648346,0.011299133,0.010566711,-0.047943115,0.025756836,0.009117126,-0.029571533,-0.03201294,0.025558472,0.011581421,-0.037353516,0.026519775,0.03982544,0.042510986,-0.005760193,0.00712204,0.012168884,0.049804688,0.04135132,0.0069732666,-0.0064926147,0.027496338,-0.011947632,0.023010254,-0.0005340576,-0.006011963,0.014060974,0.012908936,0.016799927,0.031921387,0.013122559,-0.0071640015,-0.04067993,0.003124237,0.015045166,-0.019897461,0.036376953,0.009887695,0.032989502,-0.022354126,0.014076233,0.02619934,-0.033416748,-0.013381958,0.0036468506,0.04849243,-0.009811401,-0.0048599243,0.018356323,0.014732361,0.024536133,-0.05731201,0.0012769699,-0.0019950867,0.001991272,-0.010650635,-0.06304932,-0.022323608,-0.008972168,0.029693604,-0.00020503998,0.0005173683,0.022521973,-0.0052375793,-0.0088272095,0.019165039,0.002193451,0.00056648254,-0.0066452026,-0.043029785,-0.021255493,-0.01701355,0.0058403015,-0.035125732,0.020050049,-0.004688263,-0.009162903,-0.006515503,-0.037017822,-0.00012910366,-0.009056091,-0.0019369125,0.041107178,-0.00014591217,0.0048980713,-0.006767273,-0.033416748,0.0016498566,-0.0001951456,0.015274048,-0.03173828,0.025100708,-0.0039901733,-0.0070114136,-0.014694214,0.007587433,0.0184021,0.021270752,0.008262634,0.031433105,-0.034088135,0.035491943,-0.015281677,0.01864624,-0.0028457642,-0.023529053,-0.016906738,-0.0345459,-0.014045715,0.04537964,-0.004600525,0.00024485588,-0.02357483,-0.060180664,-0.01007843,-0.060180664,0.011833191,0.015350342,0.040039062,-0.02041626,0.007820129,-0.0040664673,0.003276825,-0.005558014,-0.003578186,-0.007926941,0.0390625,0.011558533,0.004562378,-0.00806427,-0.018676758,-0.03137207,-0.0018100739,-0.05392456,-0.047180176,-0.0118637085,0.015960693,-0.008087158,-0.0064582825,-0.022201538,-0.018737793,-0.0087509155,-0.028808594,0.013748169,-0.000097215176,0.010284424,0.008743286,-0.013290405,0.0038471222,0.01687622,-0.01423645,0.020736694,0.019058228,-0.016799927,-0.03604126,0.011177063,0.016983032,0.01322937,-0.00737381,-0.0440979,0.010749817,-0.029693604,-0.05731201,0.002872467,-0.017623901,-0.008354187,-0.016708374,0.012023926,-0.03503418,0.0011749268,-0.034454346,-0.014038086,0.018112183,0.009300232,0.003194809,0.0025291443,0.013908386,-0.0042686462,-0.0029067993,-0.04019165,0.010940552,0.010787964,0.00178051,0.011230469,0.04724121,0.0034732819,-0.0119018555,-0.0019664764,-0.009483337,0.009017944,-0.018463135,0.022109985,-0.016159058,0.015220642,-0.0031967163,-0.011955261,-0.04055786,0.010421753,0.05392456,0.003124237,0.00028681755,-0.015777588,-0.004005432,0.021560669,0.035491943,-0.03756714,0.005405426,-0.023117065,0.012771606,-0.013046265,0.018692017,0.0012683868,0.02027893,-0.022323608,-0.042755127,0.0037021637,-0.006122589,-0.0010118484,-0.064208984,-0.03579712,-0.051605225,0.0061302185,0.005962372,-0.027908325,0.005542755,0.013679504,-0.023757935,-0.09460449,0.010421753,0.04095459,-0.0018434525,0.026992798,0.009216309,0.02848816,0.026687622,-0.023208618,-0.010902405,0.015609741,-0.022033691,-0.017837524,-0.032348633,0.019638062,-0.004764557,-0.018692017,0.016525269,0.018341064,0.0158844,-0.007675171,0.0013895035,-0.016418457,-0.0010004044,-0.00007110834,0.01586914,-0.011314392,-0.011039734,0.033416748,-0.06402588,0.03656006,0.016433716,0.00699234,0.0014858246,0.03439331,0.04208374,-0.04232788,0.016784668,0.02619934,0.0289917,0.045196533,-0.025650024,0.025604248,0.0119018555,0.00333786,0.0012903214,-0.01826477,-0.021209717,-0.035217285,-0.026657104,0.02357483,0.00030303,-0.00491333,-0.02998352,-0.0043678284,0.024871826,0.03152466,-0.008460999,-0.010887146,-0.016326904,-0.039276123,0.014678955,-0.004119873,-0.007331848,0.0013084412,0.019226074,0.034851074,0.047943115,0.01386261,-0.0132369995,-0.0009536743,0.022354126,-0.010604858,-0.014846802,0.019561768,0.011978149,0.014533997,0.026275635,0.01876831,-0.028335571,-0.020095825,-0.019897461,-0.01586914,0.011810303,-0.011802673,0.0015611649,0.0109939575,0.00894165,-0.003528595,-0.021697998,0.0034561157,-0.041168213,-0.04623413,-0.0020523071,-0.020492554,0.0340271,0.0107040405,-0.0077590942,0.0138168335,-0.0024223328,0.051940918,-0.0033473969,-0.02986145,0.031555176,0.040100098,0.015060425,-0.03274536,-0.00032114983,-0.0054244995,-0.015960693,-0.013000488,-0.016433716,0.023406982,0.025466919,-0.013008118,-0.00019705296,-0.011306763,0.02432251,-0.013061523,0.018585205,-0.006362915,0.008590698,-0.008003235,0.051849365,-0.055725098,0.028259277,0.022659302,-0.011627197,-0.0073127747,-0.008331299,-0.024795532,0.029281616,0.018234253,-0.007774353,0.039978027,0.0015707016,0.041656494,-0.027130127,-0.027435303,0.00045967102,-0.018173218,-0.033416748,0.016067505,-0.022918701,-0.009101868,0.01109314,-0.02319336,0.017654419,-0.025772095,0.006416321,-0.009246826,-0.014694214,-0.01878357,-0.016815186,-0.011604309,-0.00076007843,-0.020751953,-0.00068092346,-0.0051994324,0.06109619,0.02645874,0.027130127,0.032073975,0.023956299,0.024398804,-0.041900635,-0.035125732,-0.0006804466,-0.018554688,0.02330017,-0.02217102,0.053710938,0.051727295,0.016586304,0.041168213,0.02355957,0.036010742,-0.0020999908,0.025802612,-0.023117065,0.015960693,-0.01876831,0.027679443,0.00056934357,0.03781128,-0.015022278,0.018112183,0.01713562,0.014457703,-0.023208618,0.015205383,0.08483887,0.01828003,-0.015960693,0.027160645,-0.0008568764,-0.019302368,-0.017074585,-0.021972656,0.041931152,0.0071411133,0.021514893,0.046447754,0.013679504,0.0038928986,0.021224976,-0.015388489,-0.017471313,0.043670654,0.0209198,-0.0031471252,-0.008010864,-0.029067993,0.009025574,-0.041809082,-0.011299133,0.0005350113,-0.016052246,0.000042259693,-0.010719299,-0.0010309219,-0.001288414,0.01789856,0.0076828003,0.025650024,-0.014152527,0.027816772,0.0067825317,0.002336502,0.024902344,0.0110321045,0.028335571,-0.0259552,-0.022140503,0.012496948,0.030227661,-0.01234436,-0.020950317,0.03793335,0.011886597,0.04574585,0.033569336,-0.025741577,0.0045166016,0.027130127,0.008575439,0.0023536682,0.054840088,0.042938232,0.0032596588,0.04135132,0.029800415,0.033416748,-0.01953125,0.010429382,-0.012763977,0.011886597,-0.015113831,0.0043907166,0.017807007,-0.0024642944,0.031585693,-0.0072288513,-0.012336731,0.0072746277,0.032470703,0.001821518,-0.01663208,-0.011886597,0.015960693,-0.017913818,-0.0035915375,0.019622803,-0.008834839,0.02104187,0.0017795563,0.036895752,-0.034973145,0.019439697,0.004009247,-0.036132812,-0.017929077,0.019515991,-0.041748047,0.0075950623,0.011299133,-0.009788513,-0.045440674,0.0076141357,0.016326904,-0.02255249,0.015083313,0.014549255,-0.005142212,-0.0075645447,0.034820557,0.018875122,-0.0029697418,-0.016143799,-0.01802063,0.010826111,0.053527832,0.012023926,-0.017456055,-0.01663208,-0.009735107,0.0058670044,-0.015205383,-0.012435913,0.01424408,-0.022949219,-0.024124146,0.016052246,0.04006958,0.010902405,0.053527832,-0.017913818,-0.010795593,0.0013160706,0.034698486,0.0063438416,-0.026397705,-0.014823914,0.02154541,-0.016464233,0.050231934,0.03265381,0.007801056,0.036834717,0.0009851456,-0.0151901245,0.0009050369,-0.022567749,0.025772095,-0.019439697,0.0040664673,-0.00080013275,0.021972656,-0.019607544,-0.029830933,0.00093984604,-0.016830444,-0.013969421,-0.0012969971,0.010223389,0.005870819,0.016723633,0.038482666,0.02330017,-0.019515991,0.059783936,-0.014472961,0.050994873,-0.00497818,-0.015274048,0.04562378,0.028335571,0.04812622,0.0152282715,0.0018396378,-0.030441284,0.029418945,0.037017822,0.022262573,0.009613037,0.0075569153,-0.006378174,0.027908325,-0.010551453,0.040863037,-0.009384155,-0.004589081,0.022766113,-0.016952515,-0.0038051605,-0.0004246235,-0.016113281,-0.00077581406,0.056610107,-0.016403198,0.002878189,-0.026947021,-0.0104599,0.030670166,-0.010597229,0.003528595,-0.0044784546,-0.016311646,0.012779236,-0.014587402,-0.005680084,0.013954163,0.02949524,-0.045532227,-0.004135132,0.023880005,0.008377075,-0.016525269,0.033325195,0.038482666,0.0076560974,0.006160736,0.03842163,-0.021011353,0.043395996,0.007259369,0.026885986,0.03765869,0.017654419,-0.009651184,0.014801025,0.0010957718,-0.014274597,0.015991211,0.038330078,-0.018615723,-0.0052604675,0.0011825562,-0.0031642914,-0.010894775,-0.0042037964,-0.025344849,0.00995636,-0.015426636,-0.017547607,0.011856079,0.015510559,0.002714157,0.008613586,-0.007156372,-0.00868988,0.016448975,0.024459839,0.023376465,-0.04385376,-0.00035881996,0.008117676,0.008926392,-0.021377563,-0.02319336,-0.0127334595,-0.048950195,0.0046043396,0.021575928,0.0033493042,0.013786316,-0.021972656,-0.0073013306,0.020431519,0.012313843,0.028808594,0.00035905838,-0.002040863,0.014335632,-0.023651123,0.009605408,-0.010292053,-0.01751709,0.013458252,0.028701782,-0.018463135,-0.0146102905,0.008865356,-0.015388489,0.0119018555,-0.004951477,0.014846802,0.035095215,-0.0043945312,0.00044441223,0.008300781,0.013298035,-0.014007568,-0.012199402,-0.0049934387,0.0034046173,0.04055786,-0.005844116,-0.007774353,0.012763977,0.029251099,0.02268982,0.03668213,0.012992859,0.049224854,0.026351929,-0.023284912,-0.01348114,0.015388489,-0.028671265,-0.023391724,0.015571594,-0.037994385,-0.010498047,0.009567261,0.0056152344,0.00415802,-0.02609253,0.0031356812,0.0017614365,-0.012062073,0.019836426,-0.013183594,0.03048706,-0.029312134,-0.0007996559,0.01876831,-0.03289795,-0.034973145,-0.018936157,-0.010467529,-0.017822266,-0.055145264,0.005722046,-0.02885437,0.010787964,-0.023345947,0.014404297,0.005783081,0.023284912,0.0046310425,-0.013839722,0.0027179718,0.04534912,0.014625549,0.008766174,0.018127441,-0.028442383,-0.022079468,-0.012802124,0.004825592,-0.0206604,0.034423828,-0.0060310364,0.033233643,0.015701294,-0.035858154,-0.0006556511,-0.0101623535,-0.02128601,-0.010650635,-0.018096924,-0.020706177,0.0118255615,0.024276733,0.020004272,-0.009674072,0.040130615,-0.01499176,-0.00008755922,0.019622803,0.03488159,-0.0009241104,0.044647217,-0.0056610107,0.0032081604,-0.029724121,0.006450653,-0.015274048,-0.0047836304,0.0064582825,0.018615723,-0.006511688,0.026779175,0.010658264,-0.021270752,0.004169464,0.028259277,0.008590698,0.0063323975,0.03363037,0.011314392,0.003528595,-0.022613525,-0.004360199,0.006965637,0.060516357,0.020080566,-0.00055360794,-0.021026611,0.0101623535,-0.021224976,0.0059432983,0.02407837,-0.024353027,-0.03717041,-0.011138916,-0.029220581,0.017562866,-0.011138916,0.0155181885,0.000828743,0.009773254,-0.0077400208,-0.027160645,-0.023956299,0.027252197,0.011985779,-0.02406311,-0.002450943,-0.0033912659,0.012306213,-0.024139404,-0.006175995,-0.04751587,-0.039276123,-0.002746582,-0.021133423,0.027252197,-0.011444092,-0.018096924,0.00010317564,-0.012962341,-0.01802063,0.009483337,0.016616821,-0.014060974,-0.0043678284,0.018356323,0.026947021,-0.017181396,0.017150879,-0.0135650635,0.008056641,0.014625549,-0.0060310364,0.022659302,-0.012908936,0.01878357,0.009712219,0.0038871765,0.033233643,-0.0014266968,0.02078247,-0.05090332,-0.009674072,0.0058250427,-0.002325058,0.03756714,-0.013641357,-0.033721924,0.004043579,-0.03677368,-0.044067383,0.008621216,0.002872467,0.01890564,-0.001408577,0.040618896,-0.007156372,-0.01727295,0.004638672,0.013641357,-0.029785156,0.011520386,0.008102417,-0.010169983,0.012229919,-0.0056648254,-0.0061416626,-0.020492554,-0.0060539246,0.00021648407,-0.0044403076,-0.0025234222,0.011642456,0.023071289,0.044891357,0.002456665,0.018997192,0.000467062,0.0024604797,0.037506104,0.008888245,0.030075073,-0.0061531067,-0.030349731,-0.0024795532,0.008224487,-0.024612427,0.010665894,-0.0025100708,-0.0021362305,-0.036834717,0.0064582825,-0.0010261536,0.028045654,-0.0071372986,0.009269714,-0.020706177,-0.00844574,-0.017837524,-0.009719849,-0.042266846,0.019424438,0.022277832,0.007293701,0.01802063,0.0016736984,-0.020446777,0.023223877,0.034179688,0.008392334,-0.037109375,-0.0184021,-0.0007786751,-0.0026760101,-0.0010080338,0.0151901245,-0.02178955,-0.016464233,0.0003900528,-0.0066108704,-0.005584717,-0.002538681,0.024154663,0.010536194,-0.0079956055,-0.011856079,0.019989014,-0.011405945,-0.010398865,-0.0046958923,0.0021820068,0.028762817,0.039123535,-0.011962891,-0.0055122375,0.02935791,-0.03869629,0.06384277,-0.013031006,0.02444458,-0.0071372986,0.011276245,-0.049713135,-0.022827148,-0.0040283203,-0.0001707077],"createdAt":"2026-04-18T19:25:56.172Z","updatedAt":"2026-04-24T10:33:27.769Z","lastSeenAt":"2026-04-24T10:33:27.769Z","tsv":"'/api':150 '/api/v1/transactions/298/receipt':41 '/docs':149 '/pricing':151 '/readme':152 '/request':216 '0.02':10,24,75,124,215 '000':113 '0x1a2b':128 '0x8335':118 '1':106 '16':186 '20':112 '2913':119 '300':134 '6':122 '85f3':129 'Base network API' 'USDC micropayment API' 'accept':138 'access':34 'across':188 'actual':167 'address':127 'advertis':48 'ai':64,190 'analyt':63,189 'api':59,87 'application/json':143 'base':8,22,83,114,121 'behind':42 'broader':182 'call':58 'categori':60 'challeng':104 'classif':194 'commit':94 'connect':157 'convers':209 'crawl':146,233 'data':62,178 'decim':123 'detail':164,223 'doc':224 'document':147 'embed':195 'endpoint':6,20,30,98,137,187 'estim':204 'exact':108 'exampl':227 'exchang':199 'feed':198 'financ':67,196 'found':230 'gas':203 'gate':3,17 'generat':210 'geocod':207 'host':53 'howev':144 'http':139 'includ':61 'infer':191 'infrastructur':70 'json-response' 'key':88 'learn':66 'limit':91 'list':185 'lowpaymentfee' 'lowpaymentfee.com':32,183 'machin':65 'multipl':54 'natur':174 'network':84 'openapi':220 'page':148 'paramet':171 'path':40 'pay':9,23,56 'pay-per-cal':55 'pay-per-call' 'pay-per-request API' 'payload':228 'payment':131 'paywal':45 'per':13,27,57,76 'platform':52,184 'point':218 'post':140 'price':73,197,217 'probe':99 'provid':33 'quot':202 'rate':90,200 'receipt':5,19,38,177 'request':14,28,77,109,170 'requir':95 'resourc':39 'respons':168 'return':100,142,154 'schema':169 'scheme':107 'second':135 'sent':125 'sentiment':192 'settl':78 'site':47 'spec':221 'specif':97 'stub':159 'summar':193 'technic':163 'timeout':132 'token':201 'transact':4,18,37 'transaction receipt API' 'transaction-receipt' 'unit':115 'unknown':180 'usdc':12,26,80,117 'usdc-base' 'util':71,206 'valid':102,208 'version':105 'wallet':158 'web3':68 'x402':2,16,44,103 'x402 paywall endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"585684ec-d676-4de9-968f-8fb1833c94d3","listingId":"e8f36eb4-4831-4f7a-b01e-46590cac8bdb","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/transactions/298/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:56.172Z"}],"sources":[{"listingId":"e8f36eb4-4831-4f7a-b01e-46590cac8bdb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/298/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:56.172Z","lastSeenAt":"2026-04-24T10:33:27.769Z"}],"details":{"listingId":"e8f36eb4-4831-4f7a-b01e-46590cac8bdb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/298/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to proceed.","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 requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/298/receipt"},{"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 site lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /docs, /api, /pricing, /README returned only 'Connect wallet' stubs","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt via a single micropayment","Demonstrating x402 payment-gated API access on Base","Programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Low-friction one-off data retrieval without subscriptions"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Use cases needing bulk or high-volume discounted pricing","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.377Z"},"updatedAt":"2026-04-24T10:33:27.769Z"}}