{"id":"dbcd5f19-a29f-44d0-baeb-50624e262e92","shortId":"Wwh6rU","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 19) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint probed — `/api/v1/transactions/19/receipt` — returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage project showcasing x402 micropayments across many endpoint categories, but without substantive documentation it is difficult to assess the quality or completeness of the underlying services.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","transaction-receipt","micropayment","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific resource 'transactions/19/receipt' is opaque — no description of what the receipt contains","The platform lists many endpoint categories but it is unclear whether they all function or are placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/19/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/19/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 valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples of actual response payloads. The docs/pricing/README pages are all empty wallet-connect stubs. 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":"2026-04-19T12:37:41.437Z","embedding":[-0.03274536,-0.034698486,0.032440186,0.0022125244,-0.0008635521,-0.012481689,-0.019073486,0.025817871,0.053344727,-0.067993164,0.035308838,-0.037384033,-0.030899048,-0.025268555,-0.015167236,0.011734009,0.007194519,0.02545166,-0.049438477,0.044067383,0.029769897,-0.033233643,-0.017456055,0.019821167,-0.008125305,-0.027511597,-0.017807007,0.0058784485,-0.038482666,-0.025848389,0.0395813,-0.021392822,-0.022491455,0.0059928894,-0.016235352,0.019226074,-0.0066184998,0.01878357,0.03439331,-0.025817871,-0.008560181,-0.04446411,0.0029277802,-0.009971619,-0.036102295,0.013519287,-0.0005121231,-0.018508911,0.012207031,-0.005428314,-0.051361084,-0.00440979,-0.0066375732,0.02027893,-0.001991272,0.009376526,-0.012298584,-0.0015354156,0.02142334,0.0060157776,-0.009513855,-0.06323242,-0.011520386,-0.013595581,-0.0012264252,0.053222656,-0.014251709,0.05480957,0.017913818,0.07745361,0.027694702,0.050476074,0.043121338,0.011161804,0.014976501,-0.0076522827,-0.0011844635,0.025421143,-0.034088135,-0.01802063,-0.0007748604,-0.031280518,-0.082336426,-0.0033569336,-0.02217102,-0.056854248,-0.02670288,0.0073661804,-0.011802673,0.03189087,-0.064819336,0.002023697,0.0075912476,0.032409668,-0.0076179504,-0.032928467,-0.042175293,-0.0036411285,-0.004043579,0.00365448,0.000726223,-0.038269043,0.043792725,-0.010887146,0.040100098,0.02545166,-0.00982666,0.015258789,-0.0014457703,0.0012025833,-0.010185242,0.029205322,0.02281189,-0.028182983,0.028015137,-0.0050697327,-0.020126343,0.014160156,-0.027389526,0.036499023,-0.05090332,0.06549072,-0.0022525787,-0.014846802,0.006931305,-0.055603027,-0.022628784,0.0025520325,-0.02861023,0.003835678,0.052215576,0.021026611,-0.00082445145,-0.021316528,-0.017547607,0.003156662,-0.009117126,-0.015258789,-0.03781128,-0.019348145,0.027389526,-0.03515625,-0.00055122375,0.03643799,-0.07873535,0.0073890686,-0.053955078,0.011688232,-0.018554688,-0.011520386,0.00894165,0.0023498535,-0.024398804,-0.01890564,-0.020996094,-0.033966064,-0.0070495605,0.058013916,0.00073719025,0.012779236,-0.030059814,0.031402588,0.02319336,0.01637268,0.013259888,0.019180298,-0.0033073425,-0.0715332,-0.08300781,-0.006614685,0.0075683594,-0.023956299,-0.047698975,-0.004802704,-0.03451538,-0.07733154,-0.01991272,0.009216309,0.016113281,-0.04928589,-0.0053215027,-0.025848389,0.009109497,-0.030975342,-0.03717041,-0.030303955,-0.035980225,0.06008911,0.019622803,0.03555298,0.008430481,0.008377075,0.04309082,0.015235901,-0.00088977814,-0.023132324,0.004837036,-0.013183594,0.03604126,-0.0049095154,0.0066490173,-0.0143585205,0.0211792,0.080322266,-0.008705139,-0.057922363,0.008224487,-0.04373169,-0.023071289,-0.019699097,0.028335571,0.023117065,-0.022506714,0.03237915,-0.048797607,-0.0035800934,0.024902344,0.024337769,0.014022827,0.060791016,0.01727295,-0.0033721924,0.01878357,0.017730713,-0.026382446,0.064697266,0.028152466,0.024856567,-0.019180298,-0.056396484,0.018035889,0.039764404,-0.025985718,-0.0025367737,-0.008071899,0.03390503,0.0014181137,-0.021636963,0.033721924,-0.012207031,-0.022140503,-0.007537842,0.011711121,0.028259277,0.017410278,-0.02532959,-0.058898926,-0.0847168,0.0793457,0.04699707,0.02458191,0.008590698,-0.009109497,-0.017791748,-0.011505127,-0.07775879,0.036590576,0.06347656,-0.006942749,-0.036895752,0.0390625,-0.015274048,-0.042236328,-0.0047912598,-0.017059326,-0.01763916,-0.010253906,0.009292603,-0.030578613,0.01751709,-0.0068511963,0.0132751465,0.056854248,0.012039185,-0.051635742,-0.013717651,-0.010749817,0.015808105,-0.038604736,-0.01209259,0.0051727295,0.01398468,0.012039185,0.01828003,-0.00029945374,0.03829956,0.01247406,-0.024520874,0.0085372925,-0.0025043488,-0.028717041,0.01449585,0.0026550293,-0.05404663,0.009536743,-0.00705719,0.06262207,-0.06896973,0.03881836,-0.02508545,-0.0026569366,0.07067871,-0.011581421,-0.054718018,0.0012512207,0.030395508,0.022521973,0.030960083,0.027053833,0.008743286,-0.021575928,0.060546875,-0.03237915,-0.00012254715,0.012031555,0.015129089,0.040771484,-0.012527466,-0.05630493,-0.05319214,0.018218994,-0.0345459,0.029708862,-0.016937256,0.04776001,-0.00699234,0.0003876686,-0.03717041,-0.00092840195,-0.020736694,0.0037212372,-0.025253296,0.0011863708,-0.030654907,-0.027832031,0.029144287,0.009101868,-0.017532349,0.0115356445,0.06567383,0.012191772,-0.01802063,-0.027877808,-0.025115967,-0.020385742,-0.00869751,0.030258179,0.005859375,0.02003479,0.038635254,-0.03161621,0.013465881,0.020935059,-0.014854431,0.037078857,-0.0018558502,0.003353119,-0.058685303,-0.036590576,-0.013336182,-0.060028076,0.03717041,0.018325806,0.0044288635,0.054351807,0.019454956,-0.027633667,-0.017822266,0.030761719,-0.04598999,0.015670776,0.03982544,-0.019714355,-0.010826111,-0.0065231323,0.012252808,0.011932373,0.034576416,0.01751709,0.017593384,0.06262207,0.036895752,0.0012779236,0.022506714,0.019241333,0.027374268,0.00015282631,-0.014587402,-0.02418518,-0.028533936,0.035491943,-0.037353516,-0.031799316,-0.06567383,0.04953003,0.040100098,0.06561279,0.027862549,0.025177002,0.031585693,0.022857666,0.013793945,-0.008476257,-0.030471802,-0.04736328,-0.020385742,0.033966064,-0.015655518,-0.010154724,-0.010650635,0.020446777,0.011550903,0.0076560974,-0.025741577,0.040100098,-0.022918701,-0.009498596,0.01979065,0.034484863,0.041015625,0.040771484,-0.029144287,-0.0009446144,0.02720642,-0.034118652,0.019470215,0.026535034,-0.004901886,0.00032615662,-0.05758667,-0.03173828,-0.0057868958,-0.024093628,-0.05303955,0.0014371872,-0.0028038025,0.029418945,0.028259277,-0.03640747,-0.03656006,0.022888184,-0.022445679,-0.030761719,0.008644104,-0.057861328,0.017623901,0.02822876,-0.039123535,0.027389526,-0.0030174255,-0.0005311966,-0.014343262,0.003484726,-0.008056641,-0.009811401,-0.0340271,0.037963867,0.004459381,0.0006098747,0.00022017956,0.030761719,0.029037476,0.035461426,0.04550171,0.012992859,-0.013847351,-0.059417725,0.030899048,-0.03390503,0.0026302338,0.028533936,-0.030395508,0.0033817291,-0.0027637482,-0.023513794,-0.024291992,0.003921509,-0.01939392,0.006713867,0.019302368,-0.041931152,-0.021316528,-0.05734253,-0.03213501,-0.013412476,0.058624268,-0.0013942719,0.0057792664,-0.06378174,-0.006374359,0.023895264,0.0050849915,0.011116028,-0.01576233,-0.023406982,-0.009033203,-0.017425537,-0.028579712,-0.018325806,0.03427124,0.00021326542,-0.007091522,0.014709473,0.0154800415,0.004508972,0.019226074,-0.008544922,0.02268982,0.0034008026,-0.014587402,0.0015563965,0.023605347,0.0116119385,-0.033233643,-0.042022705,0.04244995,-0.020446777,0.038208008,-0.04248047,-0.004638672,0.005039215,0.012611389,0.008644104,-0.011688232,0.0007572174,0.009269714,-0.02558899,-0.06573486,0.037506104,-0.015220642,0.033599854,0.024139404,0.020721436,0.031463623,-0.018615723,0.023422241,0.0024204254,-0.042236328,-0.02748108,-0.03060913,-0.03656006,-0.024017334,-0.0023078918,-0.036956787,0.013656616,-0.0076522827,0.0001538992,-0.010444641,-0.028259277,0.04763794,-0.0039024353,0.00843811,0.012481689,0.0037117004,0.009544373,0.023391724,0.021102905,-0.05581665,0.03656006,-0.015556335,0.0048675537,-0.0073623657,0.02218628,0.02583313,-0.033203125,0.012527466,-0.015274048,0.0003118515,-0.014572144,-0.009239197,0.0025520325,0.012229919,0.014640808,-0.041259766,0.025375366,0.008514404,-0.022964478,-0.030578613,0.022262573,0.024169922,-0.032562256,0.01890564,0.031311035,0.04095459,-0.004436493,0.004299164,0.003982544,0.037750244,0.038726807,0.012435913,-0.0029201508,0.028121948,-0.014953613,0.03652954,-0.002565384,-0.0052490234,0.005519867,0.0062332153,0.022460938,0.024124146,0.015029907,-0.015914917,-0.049194336,-0.0064468384,0.010070801,-0.013771057,0.03591919,0.0074005127,0.034423828,-0.020874023,0.01763916,0.028335571,-0.03466797,-0.0103302,0.0018062592,0.047821045,-0.0077590942,0.0007019043,0.014038086,0.022949219,0.019439697,-0.0680542,-0.004322052,-0.0035896301,0.019042969,0.0010890961,-0.054107666,-0.026016235,-0.017318726,0.03845215,0.0011873245,0.008895874,0.04156494,0.004299164,-0.0025691986,0.023330688,0.006046295,-0.0063591003,-0.00623703,-0.044677734,-0.012802124,-0.014831543,0.00843811,-0.02368164,0.026229858,-0.008377075,-0.008163452,0.0061416626,-0.03274536,0.0005874634,-0.016311646,0.0009665489,0.038757324,-0.0025463104,0.0071258545,-0.003704071,-0.027282715,0.0074157715,0.006099701,0.016036987,-0.01828003,0.03036499,-0.010314941,-0.005126953,-0.014274597,0.005329132,0.013511658,0.0077781677,0.0078125,0.026977539,-0.040649414,0.049591064,-0.016860962,0.0132369995,0.0024051666,-0.022781372,-0.023391724,-0.042785645,-0.016448975,0.03274536,-0.0036735535,-0.0010538101,-0.023971558,-0.053375244,-0.019378662,-0.051452637,0.016677856,0.012588501,0.046569824,-0.021591187,0.00894928,-0.014389038,0.009391785,0.011405945,0.009613037,-0.010284424,0.042266846,0.017211914,0.018829346,-0.011009216,-0.01751709,-0.023513794,0.0010814667,-0.06555176,-0.04232788,-0.008216858,0.021270752,-0.0023536682,-0.010528564,-0.030197144,-0.02281189,-0.005126953,-0.021728516,0.010673523,-0.009254456,0.012107849,0.008010864,-0.007247925,0.0054130554,0.014762878,-0.021194458,0.03201294,0.010429382,0.00015246868,-0.03753662,0.017745972,0.018188477,0.008911133,-0.014801025,-0.03829956,0.004497528,-0.023117065,-0.047973633,0.014671326,-0.009941101,-0.00687027,-0.022735596,0.022720337,-0.049346924,-0.0021457672,-0.046447754,-0.015029907,0.011352539,0.009101868,0.011856079,-0.0036907196,0.003698349,-0.008735657,-0.0039749146,-0.04562378,0.0093307495,0.011543274,0.0045051575,0.013931274,0.05706787,0.00072717667,-0.01763916,0.0016117096,-0.014266968,0.008560181,-0.014907837,0.035614014,-0.017593384,0.012184143,-0.00005042553,-0.0019817352,-0.040252686,0.014778137,0.058929443,-0.0010519028,-0.004573822,-0.016662598,-0.0005364418,0.02293396,0.032958984,-0.041534424,0.0033817291,-0.016601562,0.016662598,-0.01737976,0.013404846,-0.0051841736,0.020385742,-0.023406982,-0.052734375,0.0011873245,-0.016098022,0.0016765594,-0.0602417,-0.028533936,-0.04812622,-0.000116825104,0.0057258606,-0.026367188,0.0059432983,0.018203735,-0.024139404,-0.09277344,0.006214142,0.052612305,0.0051841736,0.023483276,0.011764526,0.024627686,0.026138306,-0.011520386,-0.01940918,-0.001332283,-0.021484375,-0.012466431,-0.034576416,0.025253296,-0.014160156,-0.021118164,0.015434265,0.023223877,0.013221741,-0.0078125,-0.005634308,-0.025253296,0.005153656,0.0007429123,0.006252289,-0.020965576,-0.009613037,0.03366089,-0.06008911,0.043518066,0.010818481,0.006324768,-0.00605011,0.03878784,0.0395813,-0.035888672,0.0008211136,0.02609253,0.01676941,0.054779053,-0.028900146,0.027008057,0.007698059,0.008666992,-0.0063934326,-0.0070724487,-0.006877899,-0.026367188,-0.020736694,0.021194458,0.007320404,-0.009277344,-0.019622803,-0.0073547363,0.017486572,0.027664185,-0.0055274963,-0.017242432,-0.023376465,-0.039154053,0.01171875,0.005531311,-0.00894165,-0.0056648254,0.014465332,0.036987305,0.046081543,0.009460449,-0.017074585,0.015541077,0.027053833,-0.010314941,-0.01550293,0.013870239,0.014953613,0.018203735,0.012748718,0.016571045,-0.031433105,-0.027877808,-0.014091492,-0.015235901,0.007926941,-0.012145996,0.013381958,0.014572144,0.007030487,-0.0020313263,-0.018692017,0.013244629,-0.03652954,-0.04486084,-0.008644104,-0.011398315,0.03100586,0.005344391,-0.014923096,0.020507812,-0.00762558,0.055023193,-0.002817154,-0.027740479,0.0211792,0.041046143,0.021835327,-0.026245117,-0.006641388,-0.0043029785,-0.017807007,-0.006931305,-0.028961182,0.03387451,0.007282257,-0.0096206665,0.0055007935,-0.0059318542,0.021560669,-0.018814087,0.02130127,-0.008926392,0.007408142,-0.005962372,0.05758667,-0.047851562,0.025680542,0.025802612,-0.010063171,0.0014286041,-0.010368347,-0.0259552,0.03451538,0.018829346,-0.019241333,0.0413208,0.00093460083,0.045928955,-0.013519287,-0.028549194,-0.004535675,-0.019699097,-0.033599854,0.006702423,-0.018966675,-0.013198853,0.012611389,-0.023910522,0.033325195,-0.025787354,0.009124756,-0.0034885406,-0.0023269653,-0.01550293,-0.014465332,-0.0076789856,-0.00945282,-0.020050049,-0.0033817291,-0.0055351257,0.054229736,0.030853271,0.022155762,0.031402588,0.031677246,0.020233154,-0.04559326,-0.031311035,-0.0034008026,-0.008934021,0.0031433105,-0.012519836,0.047210693,0.050628662,-0.0021972656,0.051361084,0.021972656,0.026519775,-0.0038261414,0.024124146,-0.018753052,0.016342163,-0.018188477,0.027038574,-0.010871887,0.038360596,-0.020233154,0.017791748,0.013137817,0.019882202,-0.016418457,0.019729614,0.08428955,0.01826477,-0.011375427,0.027420044,0.0019741058,-0.02142334,-0.019561768,-0.022155762,0.041503906,0.01878357,0.03390503,0.05203247,0.012893677,0.015151978,0.022338867,-0.012954712,-0.013366699,0.04815674,0.02192688,-0.003452301,-0.024215698,-0.024765015,0.016906738,-0.037384033,-0.006916046,-0.0008177757,-0.024414062,-0.0047836304,-0.0056381226,-0.007888794,-0.00061130524,0.020629883,0.006549835,0.018432617,-0.01210022,0.022354126,0.0067749023,-0.008018494,0.022445679,0.010437012,0.021987915,-0.023483276,-0.022323608,0.011932373,0.029922485,-0.017410278,-0.021224976,0.03137207,0.016342163,0.04534912,0.037384033,-0.025909424,-0.0010499954,0.025482178,0.0085372925,0.0021247864,0.048339844,0.0284729,0.007019043,0.036865234,0.037841797,0.03265381,-0.019363403,0.021697998,-0.011505127,0.0026187897,-0.017044067,-0.0037212372,0.019012451,-0.0055732727,0.040527344,-0.007888794,-0.012207031,0.010322571,0.026412964,0.004459381,-0.008010864,-0.014602661,0.0039405823,-0.015945435,-0.009628296,0.02418518,-0.008178711,0.025100708,-0.0014305115,0.033477783,-0.049224854,0.019851685,0.0016880035,-0.032928467,-0.013870239,0.014373779,-0.04397583,0.008766174,-0.006576538,-0.013656616,-0.04626465,0.004524231,0.017700195,-0.01739502,0.016845703,0.0067596436,0.004055023,-0.007259369,0.03552246,0.018096924,-0.0031719208,-0.007724762,-0.020019531,0.01763916,0.044067383,0.011428833,-0.016952515,-0.018508911,-0.005302429,0.0018558502,-0.014320374,-0.008583069,0.017944336,-0.024749756,-0.013885498,0.01876831,0.041778564,0.002922058,0.04837036,-0.02557373,-0.011665344,-0.00084352493,0.038970947,0.004196167,-0.031280518,-0.00983429,0.0181427,-0.024307251,0.04534912,0.029815674,0.001461029,0.03262329,0.00762558,-0.019699097,0.005748749,-0.029464722,0.026657104,-0.01550293,0.00027799606,-0.010063171,0.017211914,-0.0155181885,-0.020858765,-0.0024204254,-0.022323608,-0.017990112,0.005519867,0.01235199,0.0008406639,0.01828003,0.039215088,0.0079422,-0.020324707,0.06414795,-0.016647339,0.046020508,0.00043439865,-0.0138168335,0.050750732,0.027618408,0.055664062,0.014907837,0.0042495728,-0.031219482,0.032043457,0.030044556,0.027023315,0.012413025,0.005748749,-0.008087158,0.026672363,-0.012535095,0.033447266,0.0009536743,-0.013198853,0.024673462,-0.019195557,-0.009994507,-0.0018205643,-0.014022827,-0.0010385513,0.053344727,-0.029388428,-0.0018692017,-0.024353027,-0.008216858,0.02027893,-0.008239746,-0.0082092285,-0.0012598038,-0.011062622,0.012168884,-0.0178833,-0.003698349,0.01725769,0.037719727,-0.043884277,0.0012016296,0.022857666,0.0090789795,-0.012306213,0.026855469,0.036010742,0.006816864,0.0012369156,0.03552246,-0.018035889,0.042785645,0.0024166107,0.034179688,0.026168823,0.011047363,-0.016952515,0.011711121,0.009559631,-0.017745972,0.008972168,0.035949707,-0.018203735,-0.00064086914,-0.002450943,-0.01222229,0.0033569336,-0.004508972,-0.021881104,0.010253906,-0.007537842,-0.01902771,0.011749268,0.015205383,0.0028953552,0.007537842,0.01373291,-0.0006752014,0.015396118,0.024719238,0.029800415,-0.042175293,-0.0019626617,0.014022827,0.008758545,-0.017654419,-0.02243042,-0.00995636,-0.03933716,0.0015439987,0.014160156,0.006855011,0.0059394836,-0.023025513,-0.014801025,0.02255249,0.003074646,0.021575928,-0.0076446533,0.0023536682,0.018432617,-0.024353027,0.0046577454,-0.0096588135,-0.009506226,0.012863159,0.02557373,-0.021987915,-0.022567749,-0.00019741058,-0.014198303,0.018157959,-0.0082092285,0.010025024,0.027511597,-0.0049858093,-0.00062704086,-0.001001358,0.020858765,-0.02017212,-0.006046295,-0.0075645447,0.01638794,0.04788208,-0.006011963,-0.0021190643,0.0075912476,0.033233643,0.023757935,0.034698486,0.021209717,0.045196533,0.028640747,-0.02053833,-0.014762878,0.0129776,-0.010154724,-0.027877808,0.016418457,-0.033203125,-0.00762558,0.0014295578,0.009712219,-0.0032539368,-0.031982422,-0.0014982224,-0.00573349,-0.0017766953,0.026138306,-0.013214111,0.022567749,-0.021820068,-0.0018959045,0.031173706,-0.032592773,-0.030517578,-0.027496338,-0.025344849,-0.015686035,-0.056793213,0.01486969,-0.0284729,0.014762878,-0.019348145,0.0063934326,0.00699234,0.016479492,0.011581421,-0.02053833,-0.00095558167,0.04168701,0.010261536,0.022384644,0.009147644,-0.027740479,-0.011695862,-0.010246277,-0.003616333,-0.024673462,0.036315918,-0.002746582,0.03390503,0.011024475,-0.040100098,-0.002714157,-0.0055160522,-0.01033783,-0.0079574585,-0.017120361,-0.017364502,0.0063972473,0.024032593,0.018310547,-0.012367249,0.030166626,-0.0289917,-0.0049705505,0.021087646,0.024398804,0.006416321,0.04071045,-0.013763428,-0.0030403137,-0.0368042,-0.0021591187,-0.008552551,0.0060157776,-0.003458023,0.022247314,-0.00381279,0.03353882,0.013511658,-0.014656067,0.01197052,0.030960083,0.013305664,0.00831604,0.021774292,0.009094238,0.004962921,-0.014427185,-0.0015478134,0.0067634583,0.053710938,0.023483276,-0.00044441223,-0.012840271,0.018157959,-0.026245117,0.007259369,0.027160645,-0.025848389,-0.02998352,-0.020370483,-0.040985107,0.012428284,-0.0061149597,0.017562866,-0.00086307526,0.016021729,-0.010627747,-0.025787354,-0.024719238,0.02798462,0.014884949,-0.026367188,0.0022335052,-0.008407593,0.009796143,-0.030685425,-0.005126953,-0.039398193,-0.039245605,-0.0029830933,-0.021881104,0.03781128,-0.001332283,-0.005332947,-0.01209259,-0.011657715,-0.0102005005,0.021774292,0.009651184,-0.003929138,-0.00381279,0.014778137,0.031951904,-0.010505676,0.022705078,-0.008415222,0.019241333,0.01134491,-0.006542206,0.029037476,-0.009841919,0.01878357,0.010437012,0.010978699,0.016723633,-0.0015420914,0.015686035,-0.04660034,-0.0032901764,0.008621216,-0.0029697418,0.03100586,-0.00073194504,-0.033111572,-0.0033054352,-0.027435303,-0.036010742,0.004032135,0.008918762,0.018859863,-0.0027885437,0.042785645,-0.0076904297,-0.019699097,0.0051994324,0.008613586,-0.01966858,0.01574707,0.020202637,-0.024398804,0.002368927,-0.00390625,-0.009162903,-0.0037403107,-0.016357422,-0.0017271042,-0.0076828003,0.0016345978,0.0042419434,0.025161743,0.028335571,0.010322571,0.027511597,-0.00074005127,0.010536194,0.03375244,0.013618469,0.04537964,-0.006210327,-0.027404785,-0.006965637,0.008956909,-0.027633667,0.019714355,0.006084442,-0.00037002563,-0.042510986,0.009468079,0.0051612854,0.02268982,-0.0037441254,0.014801025,-0.012008667,-0.017578125,-0.011299133,0.0028686523,-0.037109375,0.016738892,0.021362305,0.00605011,0.026275635,-0.004436493,-0.024642944,0.017547607,0.03967285,0.002292633,-0.033447266,-0.017532349,0.008728027,-0.0035972595,-0.0016841888,0.009429932,-0.030960083,-0.013916016,-0.003774643,-0.008590698,-0.01550293,-0.010040283,0.02053833,0.0104522705,-0.01033783,-0.010986328,0.016662598,-0.0064468384,-0.005039215,-0.0016489029,-0.00084114075,0.020889282,0.027664185,-0.00920105,-0.0055274963,0.03100586,-0.040924072,0.06384277,-0.015670776,0.020965576,-0.019500732,0.014442444,-0.05517578,-0.009315491,-0.0014648438,-0.00995636],"createdAt":"2026-04-18T18:59:10.256Z","updatedAt":"2026-04-24T18:33:04.576Z","lastSeenAt":"2026-04-24T18:33:04.576Z","tsv":"'/api':183 '/api/v1/transactions/19/receipt':116 '/docs':181 '/pricing':182 '/readme':185 '0.02':91,147 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':162 '0x8335':135 '1':123 '19':40 '20':129 '2913':136 '300':165 '402 payment required' '6':142 'Base network API' 'USDC pay-per-call' 'accept':170 'across':232 'actual':215 'address':161 'advertis':49,155 'ai':61 'analysi':65 'analyt':60 'api':57,103 'appear':219 'application/json':175 'assess':244 'base':8,22,99,131,138 'behind':41 'broader':46 'call':12,26,149 'categori':235 'challeng':121 'classif':67 'commit':110 'complet':248 'connect':191 'consist':150 'contain':216 'content':197 'convers':84 'crypto payment API' 'data':59 'decim':143 'demonstr':223 'difficult':242 'document':176,206,239 'earli':226 'early-stag':225 'embed':68 'endpoint':6,20,30,87,114,169,234 'estim':78 'exact':125 'exampl':209 'exchang':73 'extrem':178 'feed':72 'financ':69 'gas':77 'gate':3,17 'generat':85 'geocod':82 'id':39 'infrastructur':80 'json-response' 'key':104 'learn':63 'limit':107 'lowpaymentfee' 'lowpaymentfee.com':32,47 'machin':62 'mani':233 'micropay':231 'micropayment' 'network':100 'openapi':201 'page':186 'paid':9,23 'pay':54 'pay-per-request':53 'payload':214 'payment':157 'paywal':44 'per':11,25,55,92,148 'per-cal':10,24 'per-request-pricing' 'platform':48,218 'post':171 'price':71,89,156 'probe':115 'project':228 'prompt':193 'provid':33 'qualiti':246 'quot':76 'rate':74,106 'receipt':5,19,36,213 'render':188 'request':56,93,126,172 'request/response':204 'requir':111 'resourc':37 'return':117,174 'schema':205 'scheme':124 'second':166 'sent':159 'sentiment':64 'servic':252 'settl':94 'showcas':229 'sinc':139 'site':153 'span':58 'spec':202 'specif':113 'stage':227 'substant':238 'suit':51 'summar':66 'thin':179 'timeout':167 'token':75 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'translat':145 'under':251 'unit':132 'usdc':14,28,96,134,140 'usdc-base' 'use':141 'util':81 'valid':83,119 'version':122 'wallet':192 'web3':70 'without':237 'x402':2,16,43,120,230 'x402 micropayment' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e40c6171-0227-428a-9d57-94ff23d3762e","listingId":"dbcd5f19-a29f-44d0-baeb-50624e262e92","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/19/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":"2026-04-18T18:59:10.256Z"}],"sources":[{"listingId":"dbcd5f19-a29f-44d0-baeb-50624e262e92","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/19/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:10.256Z","lastSeenAt":"2026-04-24T18:33:04.576Z"}],"details":{"listingId":"dbcd5f19-a29f-44d0-baeb-50624e262e92","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/19/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/19/receipt"},{"claim":"Platform advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction ID 19 via a single micropayment","Demonstrating x402 protocol payment flows on Base with USDC","Integrating pay-per-request APIs without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Testing micropayment-gated endpoint integrations"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","High-throughput batch processing where per-call fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.063Z"},"updatedAt":"2026-04-24T18:33:04.576Z"}}