{"id":"c2a398b0-552a-41eb-9d24-bf58671adaec","shortId":"4DJ9ng","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site offers a broad catalog of pay-per-call 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 Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/158` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no examples available. It is unclear what specific data or functionality the `/api/v1/charges/158` endpoint returns, as the site's landing page lists many different API categories but does not map charge IDs to specific services. The endpoint is confirmed live (402 challenge captured successfully).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","pay-per-call"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","USDC API access","Base network API","pay-per-call API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found","The specific functionality of /api/v1/charges/158 ('Premium API Access') is not described anywhere","Cannot determine what request body to send or what response to expect"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/158","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/158","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 wallet-connect prompt, and the specific function of /api/v1/charges/158 is undefined. This is effectively a stub listing.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T03:22:21.618Z","embedding":[-0.010505676,-0.033081055,0.041137695,0.014503479,0.014060974,-0.031707764,-0.028503418,0.033721924,0.057556152,-0.064941406,0.04550171,-0.03515625,-0.03857422,-0.0256958,-0.022750854,0.008331299,-0.00843811,0.011245728,-0.056640625,0.048095703,0.036621094,-0.028640747,-0.001420021,0.034423828,-0.010848999,-0.02330017,-0.00077295303,-0.014457703,-0.013252258,-0.017715454,0.017288208,-0.019714355,-0.004852295,0.012466431,0.0021324158,-0.014854431,-0.026489258,0.052825928,0.031433105,-0.0076408386,0.0060310364,-0.06640625,-0.004875183,-0.0067100525,-0.05407715,-0.00982666,0.021713257,-0.01939392,-0.010177612,0.005882263,-0.03741455,0.0044403076,-0.013328552,-0.0030498505,0.0067977905,0.0041923523,-0.007080078,0.0034675598,0.00031900406,0.003332138,-0.003063202,-0.07348633,-0.014030457,-0.0014219284,0.010139465,0.051879883,-0.0049476624,0.05911255,0.004798889,0.05734253,0.03656006,0.05343628,0.04849243,0.0006017685,0.006576538,-0.012306213,0.003271103,0.05206299,-0.014266968,0.0055503845,-0.033447266,-0.013725281,-0.05645752,-0.018798828,-0.011810303,-0.050048828,-0.0287323,0.016677856,-0.03982544,0.0211792,-0.064941406,0.0029945374,-0.013557434,0.010253906,0.004398346,-0.00050735474,-0.015296936,0.019805908,-0.004760742,0.013801575,0.022735596,-0.04269409,0.014640808,0.020019531,0.05996704,0.039733887,0.032440186,0.031585693,-0.011581421,-0.03540039,-0.01701355,0.014503479,-0.01133728,-0.018661499,0.024398804,0.010620117,-0.021972656,0.020935059,-0.023223877,0.011207581,-0.05166626,0.049957275,0.043426514,-0.027877808,0.035827637,-0.031829834,-0.0015802383,0.0018930435,-0.03567505,-0.018417358,0.015991211,0.020950317,0.03463745,-0.021194458,-0.02507019,-0.0039520264,-0.011642456,-0.023208618,-0.04727173,-0.020721436,0.03225708,-0.02520752,0.038238525,0.04449463,-0.08691406,-0.006198883,-0.03479004,0.020385742,-0.030807495,-0.009460449,-0.008132935,0.029296875,-0.013656616,-0.015319824,-0.009063721,-0.019119263,-0.0074424744,0.035064697,-0.018814087,0.030319214,-0.007297516,0.019882202,0.0074005127,0.0060272217,0.03515625,0.038238525,-0.0034179688,-0.072021484,-0.08105469,-0.038635254,-0.019470215,-0.01675415,-0.04537964,-0.017044067,-0.0035877228,-0.08648682,-0.030532837,-0.0008749962,-0.0012569427,-0.042419434,-0.0077438354,-0.0236969,0.017959595,-0.022369385,-0.070007324,-0.01576233,-0.0129852295,0.07507324,0.014419556,0.0077285767,0.030914307,-0.016418457,0.058654785,0.012199402,-0.04043579,-0.036010742,0.028121948,-0.008659363,0.03704834,0.0071258545,0.010795593,-0.028839111,0.043060303,0.050964355,0.026779175,-0.028366089,0.0058288574,-0.04928589,-0.042755127,-0.04827881,0.0068740845,0.005302429,-0.0014915466,0.022201538,-0.028320312,-0.033569336,-0.0062446594,-0.0038852692,0.02003479,0.04748535,0.016098022,0.00466156,-0.00082445145,0.010978699,-0.034088135,0.038726807,0.026290894,0.018539429,-0.019714355,-0.02470398,0.025466919,0.021484375,-0.04208374,-0.0061302185,-0.025344849,0.019561768,0.016494751,0.01713562,0.023406982,-0.008926392,-0.034576416,-0.017730713,0.0026760101,0.020065308,0.015213013,-0.03668213,-0.056396484,-0.076293945,0.045043945,0.04748535,0.02583313,0.0015697479,0.009811401,-0.020965576,-0.01637268,-0.077697754,0.060424805,0.08496094,-0.009506226,-0.017349243,0.02067566,-0.011512756,-0.031707764,-0.023849487,-0.00869751,-0.02519226,-0.01626587,0.014663696,-0.035369873,0.0049324036,0.007949829,0.033294678,0.068725586,-0.016845703,-0.061401367,-0.035125732,0.0022945404,0.012550354,-0.014511108,-0.0018024445,-0.010025024,0.027648926,0.029327393,-0.0032176971,0.028366089,0.011566162,0.024124146,-0.008758545,-0.0023555756,-0.020858765,-0.008148193,0.013801575,-0.010223389,-0.07122803,0.015037537,-0.00283432,0.04107666,-0.04446411,0.053771973,-0.005458832,0.0069389343,0.068481445,-0.008850098,-0.048980713,0.007217407,0.022521973,0.04650879,0.041900635,0.0033168793,-0.012275696,-0.013534546,0.070617676,-0.014144897,-0.0046081543,0.004962921,0.0074157715,0.0211792,0.013969421,-0.07067871,-0.03829956,-0.010284424,-0.0056419373,0.027114868,-0.024108887,0.026550293,-0.025466919,0.018005371,-0.013763428,0.0047340393,-0.041503906,0.006290436,-0.0126953125,0.008590698,-0.024642944,-0.020812988,0.019714355,0.016555786,-0.029296875,0.014434814,0.043060303,0.028289795,-0.018463135,-0.027816772,-0.014884949,-0.015991211,0.005432129,0.026153564,0.017105103,0.022750854,0.03579712,-0.037078857,0.028366089,0.026885986,0.009475708,0.04208374,-0.018310547,0.0129776,-0.052947998,-0.046295166,-0.016540527,-0.040374756,0.03744507,0.013435364,0.007381439,0.049835205,0.0050201416,-0.018005371,-0.02609253,0.027908325,-0.046691895,-0.003206253,0.036895752,0.0016498566,-0.044708252,-0.0076065063,0.01008606,0.0021648407,0.03543091,0.015312195,-0.0035934448,0.061950684,0.02444458,0.004081726,0.020950317,0.027954102,0.017120361,-0.0024662018,-0.04031372,-0.012962341,-0.0075912476,0.017349243,-0.014816284,-0.019104004,-0.068725586,0.05090332,0.032196045,0.07470703,0.021469116,0.014625549,0.039520264,-0.013168335,0.004196167,-0.042755127,-0.02998352,-0.02180481,-0.04638672,0.025817871,-0.020629883,-0.009506226,-0.03237915,0.03250122,0.015960693,0.016448975,-0.04324341,0.06365967,0.00894928,-0.008865356,0.022079468,0.00045323372,0.04776001,0.055603027,-0.049957275,0.019805908,0.020263672,-0.037841797,-0.0032444,0.05316162,0.00092601776,-0.012260437,-0.066711426,-0.029418945,0.013587952,-0.015312195,-0.074157715,-0.006839752,0.012367249,0.021011353,0.023513794,-0.0049324036,-0.04168701,0.006587982,-0.030090332,-0.049468994,-0.003583908,-0.04171753,0.010551453,0.045684814,-0.04171753,0.008773804,0.005268097,-0.0027103424,-0.01852417,0.016464233,0.009490967,-0.0026359558,-0.054748535,0.034179688,0.009849548,0.011138916,0.011924744,0.029800415,0.04446411,0.008079529,0.052978516,0.012550354,-0.012176514,-0.05230713,0.021850586,-0.040252686,0.0019035339,0.005268097,-0.010871887,-0.007331848,-0.01876831,-0.026763916,-0.029846191,-0.006198883,-0.013282776,0.0067749023,0.004550934,-0.04559326,-0.029022217,-0.045410156,-0.012298584,-0.0017194748,0.07293701,0.030776978,-0.009231567,-0.056640625,-0.015312195,0.03213501,0.01260376,-0.005756378,-0.016647339,-0.02166748,-0.012634277,-0.033416748,-0.014503479,-0.022659302,0.02507019,-0.005657196,-0.022949219,0.03289795,-0.0072517395,0.005809784,-0.01977539,0.006248474,0.04498291,-0.025360107,0.0046577454,-0.04849243,0.010299683,-0.0002425909,-0.009994507,-0.052947998,0.042297363,0.015625,0.04272461,-0.027374268,0.020050049,0.0008120537,0.016235352,0.017486572,-0.0062675476,-0.010887146,0.0002450943,-0.03918457,-0.08001709,0.021194458,-0.015319824,0.023101807,0.0054092407,0.0047912598,0.037597656,-0.01171875,0.016036987,0.022735596,-0.023361206,-0.0012617111,-0.026763916,-0.039001465,-0.004928589,-0.0014848709,-0.005382538,0.01966858,-0.010070801,0.016357422,-0.011375427,-0.017837524,0.026947021,0.012741089,0.0017709732,0.0184021,0.0011587143,0.010719299,0.051940918,0.008415222,-0.039611816,0.01914978,-0.0042686462,0.000151515,-0.016860962,0.04473877,0.022918701,-0.018829346,-0.010925293,-0.0059051514,-0.013282776,-0.020141602,-0.013145447,0.0146484375,0.03503418,0.0019950867,-0.04458618,0.031677246,0.012084961,-0.026947021,-0.00026154518,0.01838684,0.034118652,-0.032287598,0.03050232,0.01335144,0.060699463,-0.020492554,-0.008163452,0.016921997,0.026428223,0.02116394,0.016845703,-0.012084961,0.013923645,-0.00037622452,0.01576233,-0.013130188,-0.0031471252,0.0124053955,-0.007320404,0.009796143,0.01285553,0.018310547,-0.01739502,-0.020431519,0.013633728,-0.011817932,-0.014831543,0.018310547,0.015914917,0.013008118,-0.022018433,0.021896362,0.010238647,-0.03704834,-0.020645142,0.005344391,0.04562378,-0.026397705,0.001329422,0.012535095,0.0016527176,0.028640747,-0.06100464,-0.0020179749,0.016052246,0.010871887,-0.01991272,-0.05569458,-0.028366089,0.014762878,0.03451538,-0.0045776367,0.005695343,0.033477783,0.0052871704,0.00491333,0.015159607,0.0046157837,-0.011024475,-0.008903503,-0.04486084,-0.0024375916,-0.0071868896,0.0031814575,-0.022445679,0.011009216,-0.022750854,-0.038330078,0.00894928,-0.013786316,-0.0040016174,-0.0025157928,0.029052734,0.039245605,-0.0051193237,0.00080919266,-0.017440796,-0.020523071,0.005455017,-0.011375427,0.027145386,-0.044433594,0.011558533,-0.024459839,-0.0022850037,-0.012062073,-0.0026721954,0.02067566,0.013923645,-0.005115509,0.021209717,-0.04534912,0.04147339,-0.02519226,0.009643555,0.011734009,-0.044525146,-0.005710602,-0.029907227,-0.014801025,0.022613525,-0.0024051666,-0.0023708344,-0.029083252,-0.022201538,-0.0062294006,-0.055877686,0.01687622,0.030899048,0.032989502,-0.021606445,-0.0020637512,0.014762878,-0.010665894,-0.011756897,0.0038719177,-0.018493652,0.026306152,0.017990112,0.0138549805,-0.029434204,-0.0206604,-0.013160706,0.008094788,-0.0602417,-0.051696777,-0.019119263,0.02355957,-0.011039734,-0.0002849102,-0.017593384,-0.016281128,-0.001791954,-0.04244995,0.01335144,0.0052986145,0.031707764,0.008895874,-0.008575439,-0.0044441223,0.016021729,-0.017929077,0.034179688,0.001824379,-0.009033203,-0.03164673,-0.015823364,0.0501709,0.023483276,-0.004348755,-0.010536194,-0.0027427673,-0.020751953,-0.042816162,-0.0071487427,-0.002729416,-0.0028572083,-0.0028858185,0.01222229,-0.051483154,-0.010498047,-0.031707764,-0.0152282715,0.026824951,0.014640808,0.023406982,0.0027770996,-0.0062217712,-0.00066041946,-0.018493652,-0.031463623,0.019546509,0.0119018555,0.0022506714,0.011169434,0.03439331,0.0062179565,-0.0045814514,-0.0043296814,-0.0002732277,0.014816284,-0.032592773,0.012367249,-0.009170532,0.016479492,-0.009399414,-0.0048561096,-0.026229858,-0.011047363,0.08477783,0.004432678,-0.008392334,-0.0077590942,-0.015853882,0.012313843,0.013221741,-0.067871094,-0.008033752,-0.044647217,0.024414062,-0.024108887,0.01586914,0.006378174,0.011184692,-0.036193848,-0.06652832,-0.010734558,0.017440796,-0.015197754,-0.053619385,-0.009933472,-0.052642822,-0.016738892,-0.008323669,-0.017288208,0.008010864,0.010009766,-0.019348145,-0.08746338,0.018569946,0.053527832,0.0040740967,0.008308411,-0.022659302,0.014297485,0.0181427,-0.022750854,-0.0063819885,0.031829834,-0.013252258,-0.017623901,-0.012428284,0.021194458,-0.016113281,-0.015686035,0.028457642,0.013969421,0.0046539307,-0.009185791,0.009819031,-0.01335907,0.012306213,-0.002986908,0.011177063,-0.0057907104,-0.018707275,0.03503418,-0.050109863,0.030776978,0.030075073,0.011665344,-0.0003733635,0.031173706,0.029800415,-0.04244995,-0.015525818,0.034088135,-0.0059814453,0.036743164,-0.032165527,0.043914795,0.021392822,-0.005760193,0.01574707,-0.023208618,-0.037322998,-0.03527832,-0.039520264,0.020309448,0.02104187,0.01108551,-0.00042247772,0.0006804466,0.022354126,-0.0079574585,0.0016727448,-0.011123657,-0.016021729,0.0029125214,0.015838623,0.002714157,0.0012044907,-0.007091522,0.029830933,0.016311646,0.04837036,-0.0032157898,0.0006546974,-0.0050468445,0.022064209,-0.014282227,0.0098724365,0.018478394,0.024124146,0.022094727,0.008132935,0.0075645447,-0.03866577,-0.013755798,-0.00982666,0.0060195923,0.01083374,-0.004432678,0.0007815361,-0.0008511543,-0.0072631836,0.002231598,-0.038116455,0.009933472,-0.039794922,-0.019226074,0.008354187,-0.00374794,0.006275177,0.015350342,-0.005039215,0.012702942,0.008506775,0.057769775,-0.001452446,0.0056915283,0.020690918,0.0362854,0.013786316,-0.031677246,-0.00844574,-0.005744934,-0.005596161,0.004306793,-0.010765076,0.018630981,0.04611206,-0.0074005127,0.024246216,-0.024841309,0.02116394,0.0013036728,0.018295288,-0.016799927,0.013389587,-0.010238647,0.03149414,-0.03741455,0.014419556,0.033111572,-0.002368927,-0.014434814,-0.029663086,-0.015609741,0.018600464,0.013549805,-0.0021743774,0.044433594,-0.002210617,0.025939941,-0.022491455,-0.016937256,0.006958008,-0.032684326,-0.020568848,0.026321411,-0.007484436,-0.0013933182,0.015625,-0.028366089,0.028198242,-0.04034424,0.017456055,0.0018758774,-0.0043792725,-0.012428284,-0.015525818,-0.025482178,-0.0128479,-0.0127334595,0.020553589,0.0005583763,0.040222168,0.022979736,0.036712646,0.037261963,0.015365601,0.0076560974,-0.041900635,-0.023223877,-0.010528564,-0.037719727,0.016311646,-0.008003235,0.03918457,0.03857422,-0.002319336,0.034332275,0.04727173,0.03768921,0.0031147003,0.023269653,-0.016906738,0.005836487,-0.006477356,0.03515625,-0.001241684,0.037078857,-0.018539429,0.016921997,0.0019950867,0.03326416,-0.027130127,0.017074585,0.07312012,0.023590088,-0.011154175,0.042266846,-0.00044584274,-0.02281189,-0.020721436,-0.016799927,0.05279541,0.031555176,0.0390625,0.053771973,0.013259888,-0.022399902,0.018081665,-0.032562256,-0.042785645,0.06945801,0.020736694,-0.029327393,-0.01675415,-0.007537842,0.018417358,-0.051849365,-0.018356323,0.01235199,-0.00289917,0.019241333,-0.017532349,-0.00409317,-0.014556885,0.015960693,0.020858765,0.0184021,-0.018417358,0.02507019,0.012283325,0.019348145,0.025314331,0.015777588,0.014968872,-0.037597656,-0.0058135986,0.0055274963,0.021499634,-0.013252258,-0.003025055,0.029663086,0.013015747,0.054595947,0.024627686,-0.0027427673,-0.00036883354,0.031799316,0.029434204,-0.008720398,0.043060303,0.03225708,0.019363403,0.03186035,0.03930664,0.018814087,-0.037353516,0.015281677,-0.0023422241,0.021072388,0.0048675537,-0.014038086,0.00843811,-0.0037956238,0.0146102905,-0.0037593842,-0.016189575,0.02293396,0.026306152,-0.0021858215,-0.008728027,-0.0029678345,0.006790161,-0.0036697388,0.0023593903,0.00004374981,-0.016235352,0.01576233,0.0051956177,0.03265381,-0.023727417,0.020370483,-0.007926941,-0.027069092,-0.011352539,0.013763428,-0.046966553,0.0015363693,0.003063202,-0.010131836,-0.027542114,0.0057907104,0.020050049,0.000005185604,0.023101807,0.015586853,0.00041294098,0.0018434525,0.018295288,0.019744873,0.0034122467,-0.016952515,-0.012313843,0.030532837,0.045532227,-0.0022773743,0.013420105,-0.019424438,-0.010292053,0.0070724487,-0.0034751892,-0.0031795502,-0.0058288574,-0.0178833,-0.03012085,0.018493652,0.036346436,0.019836426,0.030838013,-0.006916046,-0.025131226,0.002998352,0.025054932,0.007118225,0.00548172,-0.018096924,0.02357483,-0.007423401,0.05303955,0.028030396,-0.0007786751,0.036865234,-0.01852417,-0.009796143,0.0077781677,-0.023071289,0.031280518,-0.015701294,0.00047659874,-0.022399902,0.023849487,-0.020309448,-0.028839111,-0.0006489754,-0.01626587,-0.008621216,-0.032226562,-0.0053977966,0.0181427,0.013618469,0.032318115,0.01109314,-0.02973938,0.074157715,-0.008216858,0.057769775,-0.012680054,0.0008625984,0.043426514,0.04360962,0.039001465,0.022842407,0.008644104,-0.032104492,0.010643005,0.034301758,0.03237915,0.0037174225,-0.0012016296,-0.010429382,0.030456543,-0.004840851,0.02267456,-0.013191223,0.000055015087,0.0073051453,-0.010055542,-0.007320404,0.006313324,-0.00007253885,0.011871338,0.049102783,-0.025924683,-0.011184692,-0.029708862,-0.0132369995,0.032348633,0.01171875,-0.00060272217,-0.0031337738,-0.0046806335,0.01146698,-0.030181885,-0.016784668,0.0149002075,0.031311035,-0.045684814,-0.019256592,0.0032577515,0.016616821,-0.022445679,0.03274536,0.027694702,-0.014678955,0.011421204,0.05206299,-0.01210022,0.032287598,-0.0010147095,0.026535034,0.02822876,-0.0018386841,-0.019088745,0.010246277,0.0064735413,-0.014816284,0.013656616,0.0357666,-0.0062294006,0.004940033,-0.0043678284,-0.01991272,0.0022850037,0.0014381409,-0.026428223,0.005962372,-0.006340027,-0.011703491,0.0065078735,0.0077705383,0.0013885498,0.0025615692,-0.019424438,-0.0069351196,0.0013895035,0.029953003,0.011528015,-0.051239014,0.0019702911,0.012260437,0.0044898987,-0.032440186,-0.027404785,-0.00932312,-0.02432251,0.01776123,0.02142334,0.008239746,0.0049438477,-0.022583008,-0.0051956177,0.030670166,0.00057411194,0.023849487,0.012046814,-0.008026123,0.007709503,-0.023910522,0.0010194778,-0.0029277802,-0.00011819601,0.003627777,0.0027599335,0.001250267,-0.019729614,0.02758789,0.0006260872,0.016174316,-0.0024032593,-0.019104004,0.029556274,-0.015670776,-0.014266968,0.00749588,0.0234375,-0.016799927,-0.009819031,-0.022491455,0.024383545,0.058044434,0.004585266,-0.0056381226,0.015838623,0.019119263,0.020904541,0.035095215,0.028366089,0.04071045,0.023025513,-0.0206604,-0.007133484,0.013885498,-0.008460999,-0.026306152,0.01651001,-0.0062828064,-0.004295349,0.011810303,0.018676758,-0.009407043,-0.024261475,-0.020721436,-0.014251709,-0.018081665,0.012031555,-0.012992859,0.012542725,-0.032470703,-0.016403198,0.011177063,-0.008781433,-0.041625977,-0.03479004,-0.009101868,-0.023468018,-0.04071045,0.009651184,-0.027633667,0.009346008,-0.010650635,0.0024814606,-0.009819031,0.030975342,-0.011924744,0.0014562607,0.008163452,0.023101807,0.016189575,0.018676758,0.025497437,-0.03479004,-0.036010742,-0.014442444,-0.0056648254,-0.019943237,0.02267456,0.0029354095,0.028640747,0.014732361,-0.0036144257,0.0017938614,-0.015060425,-0.0008239746,0.008270264,-0.039215088,-0.009140015,0.020141602,0.020446777,-0.011642456,-0.016983032,0.035858154,-0.027511597,-0.011978149,0.014678955,0.043060303,0.011474609,0.03201294,-0.01637268,0.0061836243,-0.021148682,-0.005332947,-0.015060425,-0.0027580261,0.0049743652,0.0028915405,-0.008987427,0.004650116,0.011566162,-0.009361267,-0.008934021,0.02003479,0.007820129,-0.026000977,0.026565552,0.006965637,0.015716553,-0.0018310547,-0.014976501,0.01600647,0.038970947,0.006538391,0.005340576,-0.00030732155,0.01474762,-0.0032577515,0.008796692,0.021972656,-0.025512695,-0.0362854,-0.01751709,-0.02444458,0.01890564,0.010635376,0.022216797,-0.000705719,0.010726929,-0.01637268,-0.032562256,-0.02520752,0.014266968,-0.0075035095,-0.006832123,-0.01586914,0.0014638901,0.024917603,-0.031280518,0.0015096664,-0.031951904,-0.023010254,-0.016921997,-0.021118164,0.015960693,0.003528595,-0.016342163,0.010696411,-0.0032863617,-0.007221222,0.011482239,0.035308838,-0.018005371,-0.0038852692,0.015380859,0.014183044,-0.029327393,0.0054130554,-0.007911682,-0.01914978,0.013511658,-0.013168335,0.013427734,-0.015319824,0.033294678,0.009300232,0.0017223358,0.032562256,-0.0019168854,0.011985779,-0.011833191,-0.0028953552,-0.001616478,-0.002626419,0.03869629,-0.0033302307,-0.015159607,0.010879517,-0.017227173,-0.033569336,0.0034008026,0.03048706,0.041412354,-0.007648468,0.04260254,-0.026397705,-0.017181396,0.003862381,0.010406494,-0.020736694,0.0071487427,0.026641846,0.013618469,-0.008285522,-0.0029067993,-0.016342163,-0.032348633,-0.010475159,0.025741577,-0.0052757263,-0.00881958,0.010864258,0.0038852692,0.04473877,0.004432678,0.019515991,0.021438599,-0.003917694,0.024002075,0.002696991,0.042541504,-0.010292053,-0.03656006,0.015197754,-0.001080513,-0.023254395,-0.009994507,-0.005256653,0.008049011,-0.03338623,0.025680542,-0.015174866,0.038757324,-0.012329102,0.003604889,-0.021606445,0.008796692,-0.027664185,-0.0010232925,-0.032196045,0.014320374,0.034301758,0.01210022,0.008735657,0.005355835,-0.024490356,0.026016235,0.050628662,-0.017913818,-0.032226562,-0.008010864,0.02330017,0.0044174194,0.012496948,0.01940918,-0.025299072,-0.021026611,-0.007987976,-0.023406982,0.008232117,-0.015670776,0.016464233,0.008850098,-0.0047798157,-0.0027694702,0.031082153,0.010719299,0.0039863586,0.006427765,0.0009531975,0.034118652,0.03579712,-0.014419556,0.022888184,0.022216797,-0.034362793,0.05279541,-0.006389618,0.029769897,-0.020721436,-0.0020122528,-0.03152466,-0.021347046,-0.005115509,0.006980896],"createdAt":"2026-04-18T18:44:26.057Z","updatedAt":"2026-04-24T04:03:33.114Z","lastSeenAt":"2026-04-24T04:03:33.114Z","tsv":"'/api':179 '/api/v1/charges/158':112,216 '/docs':178 '/pricing':180 '/readme':182 '0.02':10,24,90,142 '000':129 '0x8335':134 '20':128 '2913':135 '402':244 '6':138 'Base network API' 'USDC API access' 'accept':167 'access':6,20,36,117 'address':164 'advertis':124 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,100,116,228 'application/json':172 'attach':151 'avail':206 'base':8,22,43,97,130,137 'base-network' 'behind':37 'broad':49 'call':55 'caller':150 'captur':246 'catalog':50 'categori':229 'challeng':121,123,245 'charg':234 'classif':66 'commit':107 'confirm':242 'connect':188 'content':194 'convers':83 'data':58,212 'decim':139 'differ':227 'document':173 'embed':67 'endpoint':30,86,111,166,217,240 'equal':141 'estim':77 'exact':148 'exampl':205 'exchang':72 'extrem':175 'feed':71 'financ':68 'function':214 'gas':76 'gate':3,17 'generat':84 'geocod':81 'header':156 'id':235 'infrastructur':79 'json-response' 'key':101 'label':114 'land':223 'learn':62 'limit':104 'list':225 'live':243 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'mani':226 'map':233 'maxamountrequir':126 'micropayment API' 'network':44 'no-api-key' 'offer':47 'openapi':198 'page':183,224 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':143,155,160 'payto':163 'paywal':40 'per':11,25,54,91 'post':168 'post-method' 'premium':4,18,34,115 'price':70,88 'prompt':190 'provid':33 'quot':75 'rate':73,103 'render':185 'request':12,26,92,169 'request/response':201 'requir':108 'return':171,218 'schema':202 'scheme':149 'sentiment':63 'servic':238 'settl':93 'sign':159 'site':46,221 'span':57 'spars':176 'spec':199 'specif':110,211,237 'success':247 'summar':65 'token':74 'unclear':209 'unit':131 'usdc':14,28,95,133 'usdc-settlement' 'util':80 'valid':82 'via':145 'wallet':189 'web3':69 'x':154 'x-payment':153 'x402':2,16,39,120,147 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"924a86ff-e37d-4c04-8228-b02c6cf82741","listingId":"c2a398b0-552a-41eb-9d24-bf58671adaec","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/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:26.057Z"}],"sources":[{"listingId":"c2a398b0-552a-41eb-9d24-bf58671adaec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:26.057Z","lastSeenAt":"2026-04-24T04:03:33.114Z"}],"details":{"listingId":"c2a398b0-552a-41eb-9d24-bf58671adaec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/158 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/158"},{"claim":"Site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without needing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows with a low-cost endpoint"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402 protocol integrators looking for a live test endpoint","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","Anyone requiring non-crypto payment methods","Production workloads that need guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.426Z"},"updatedAt":"2026-04-24T04:03:33.114Z"}}