{"id":"25d7093a-3339-4dd4-b0a4-88ab0424fb10","shortId":"M5vWp9","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/crypto, and utility services. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with each request.\n\nThe specific endpoint at `/api/v1/charges/20` is listed as \"Premium API Access\" and charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. The platform advertises categories including 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 per-request pricing.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto pay api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request/response formats for any endpoint","Actual functionality behind listed endpoints (AI, analytics, finance, etc.) cannot be verified from crawl data","The specific endpoint /api/v1/charges/20 labeled 'Premium API Access' has no description of what it actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/20","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The actual functionality behind the endpoints is unverifiable from available material.","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":"2026-04-19T03:32:09.119Z","embedding":[-0.02003479,-0.042266846,0.037628174,0.008270264,0.020141602,-0.028015137,-0.03189087,0.025497437,0.06866455,-0.057525635,0.026245117,-0.045440674,-0.033416748,-0.039733887,-0.014434814,0.014266968,-0.00687027,0.004295349,-0.043395996,0.035186768,0.014404297,-0.0056762695,-0.019805908,0.02029419,-0.0036563873,-0.020614624,-0.0008325577,-0.008132935,-0.015487671,-0.048736572,0.034332275,-0.025909424,-0.011695862,0.0027046204,-0.015975952,-0.011627197,-0.015602112,0.027923584,0.032684326,-0.0075416565,-0.0074806213,-0.066833496,0.008926392,-0.021255493,-0.06390381,-0.00856781,0.015083313,-0.013038635,0.018310547,0.004508972,-0.040893555,-0.000052452087,-0.011779785,-0.0045776367,0.0046081543,0.021881104,-0.00021648407,0.0053253174,0.00819397,0.0082473755,-0.008079529,-0.0725708,-0.014160156,0.0043754578,-0.0058021545,0.05895996,-0.004306793,0.04031372,0.0076828003,0.06274414,0.030563354,0.05316162,0.032684326,0.0010738373,0.003200531,-0.014816284,-0.008674622,0.05178833,-0.0104599,-0.024215698,-0.02067566,-0.011398315,-0.03857422,-0.00092458725,-0.013252258,-0.050750732,-0.028808594,0.0236969,-0.030715942,0.032806396,-0.068603516,-0.0050201416,-0.020202637,-0.012428284,0.019485474,-0.005718231,-0.0027637482,0.021728516,-0.00223732,0.017974854,-0.0030136108,-0.046295166,0.007575989,0.019744873,0.03186035,0.05557251,0.024475098,0.016647339,0.006942749,-0.0011911392,-0.041015625,0.020309448,-0.020812988,-0.027709961,0.008270264,0.0067214966,-0.014137268,0.015457153,-0.041748047,0.0030117035,-0.056915283,0.049224854,0.034179688,0.017547607,0.011024475,-0.046661377,-0.02178955,0.004962921,-0.022109985,-0.012397766,0.013946533,0.01876831,0.035736084,-0.013366699,-0.028411865,0.0072631836,-0.031021118,-0.007843018,-0.056762695,-0.034210205,0.050445557,-0.02758789,0.017990112,0.045440674,-0.09436035,-0.0066337585,-0.042388916,0.006137848,-0.0309906,-0.008705139,0.003643036,0.019500732,-0.023727417,-0.016555786,-0.021514893,-0.02267456,-0.0079193115,0.034240723,-0.004398346,0.0335083,-0.02645874,0.038330078,0.008422852,-0.0048980713,0.007030487,0.033813477,-0.007499695,-0.076049805,-0.0793457,-0.024230957,-0.011909485,-0.027557373,-0.025863647,0.0039253235,-0.007850647,-0.079956055,-0.023635864,-0.008834839,-0.0039024353,-0.035827637,-0.004261017,-0.034820557,0.018447876,-0.012214661,-0.06304932,-0.013320923,-0.02192688,0.060302734,0.03543091,0.0357666,0.017318726,-0.009231567,0.0625,0.040008545,-0.024902344,-0.017654419,0.026428223,-0.012802124,0.0262146,-0.007865906,0.014945984,-0.031982422,0.046173096,0.064086914,0.01158905,-0.02758789,-0.0075302124,-0.063964844,-0.050231934,-0.045318604,0.024536133,0.012748718,-0.0051078796,0.03173828,-0.043914795,-0.031280518,-0.0038490295,0.020202637,0.015037537,0.06274414,0.011383057,-0.012290955,0.035003662,0.00869751,-0.060699463,0.041259766,0.024963379,0.0052719116,-0.022140503,-0.02571106,0.039031982,0.032470703,-0.035125732,0.01838684,-0.012481689,0.016296387,-0.0020980835,0.011146545,0.017211914,-0.0051460266,-0.031555176,-0.020385742,-0.02406311,0.024475098,0.0013790131,-0.026641846,-0.032470703,-0.08068848,0.053375244,0.024459839,0.026885986,-0.0022850037,0.02015686,-0.02217102,-0.008407593,-0.07904053,0.056549072,0.070373535,0.00793457,-0.02519226,0.023483276,-0.009490967,-0.034698486,0.008514404,-0.009727478,-0.030273438,-0.026397705,0.03265381,-0.040252686,-0.014343262,0.03338623,0.014282227,0.05697632,-0.024398804,-0.04937744,-0.017105103,-0.0031356812,0.0039367676,-0.0345459,-0.0079956055,-0.0056533813,0.02519226,0.026687622,0.0070877075,0.011947632,0.0013742447,0.0028247833,-0.009056091,0.009887695,-0.01184082,-0.027069092,0.00819397,-0.0059814453,-0.056488037,-0.0011739731,0.0012130737,0.06768799,-0.043518066,0.03933716,-0.0025367737,0.017822266,0.05239868,-0.008552551,-0.04736328,0.006252289,0.03164673,0.004169464,0.047302246,0.030914307,-0.029205322,-0.009132385,0.072509766,-0.0074920654,-0.0057373047,0.0049057007,0.005710602,0.031555176,-0.01612854,-0.061828613,-0.048065186,0.0059432983,-0.021194458,0.02986145,-0.021102905,0.026168823,-0.0076446533,0.017608643,-0.021270752,0.007972717,-0.03579712,0.012359619,-0.005973816,0.010421753,-0.010856628,-0.025405884,0.014663696,0.01525116,-0.02003479,0.0025577545,0.033477783,0.023712158,-0.0050354004,-0.03540039,-0.04006958,-0.010826111,-0.008308411,0.025558472,0.02645874,0.02406311,0.034698486,-0.041046143,0.0078125,0.021972656,0.008979797,0.026382446,-0.0021705627,-0.018127441,-0.0692749,-0.06488037,-0.034362793,-0.036956787,0.035217285,0.034240723,-0.00381279,0.049682617,-0.0002989769,-0.022628784,-0.030456543,0.017959595,-0.03918457,-0.004261017,0.044036865,-0.014060974,-0.033172607,0.007575989,-0.006843567,0.008903503,0.034118652,0.019241333,0.019714355,0.058410645,0.034576416,0.007972717,0.015716553,0.0054779053,0.028884888,0.011413574,-0.027633667,-0.024887085,-0.005718231,0.042938232,-0.034088135,-0.024536133,-0.05307007,0.05480957,0.03314209,0.0927124,0.02973938,0.008110046,0.039031982,-0.021560669,0.017807007,-0.02357483,-0.026992798,-0.027359009,-0.0423584,0.033966064,-0.013587952,-0.0095825195,-0.019515991,0.044158936,0.0059776306,0.011772156,-0.035186768,0.04058838,-0.008705139,-0.0121154785,0.018951416,0.01739502,0.050872803,0.06744385,-0.049438477,0.017196655,0.016021729,-0.040771484,-0.014472961,0.046173096,-0.0056610107,0.0008172989,-0.0703125,-0.025360107,-0.007701874,-0.003868103,-0.059387207,0.0038166046,0.0042533875,0.0152282715,0.025634766,-0.01411438,-0.009147644,-0.018508911,-0.025527954,-0.04333496,-0.003112793,-0.043518066,-0.0015277863,0.03765869,-0.026809692,-0.008613586,0.0042495728,-0.010238647,-0.015655518,0.015167236,0.035888672,-0.014724731,-0.051086426,0.046813965,0.010612488,-0.0029945374,0.008232117,0.03869629,0.034484863,0.023254395,0.04660034,0.009773254,-0.020843506,-0.06774902,0.027023315,-0.03640747,0.009353638,0.015838623,-0.020004272,-0.016098022,-0.013328552,-0.034820557,-0.041992188,0.013832092,-0.018951416,-0.0013217926,0.013160706,-0.025436401,-0.026870728,-0.056243896,-0.01335907,-0.0073432922,0.058135986,0.019058228,-0.00497818,-0.05859375,-0.00064992905,0.016479492,0.00982666,0.03390503,-0.014038086,-0.01020813,-0.007041931,-0.030883789,0.003042221,-0.009880066,0.01902771,-0.013000488,0.014038086,0.020141602,0.013801575,0.020065308,0.0039901733,0.0118637085,0.026565552,-0.023956299,-0.008430481,-0.012275696,0.027435303,0.014625549,-0.00014173985,-0.040863037,0.037078857,0.012336731,0.035949707,-0.040985107,0.0052108765,-0.007499695,0.0046691895,0.023117065,-0.012191772,-0.0072746277,-0.00869751,-0.04559326,-0.057922363,0.031143188,-0.021118164,0.028045654,0.022140503,0.002840042,0.029403687,-0.027709961,0.0037784576,0.016967773,-0.017959595,-0.010169983,-0.008056641,-0.03527832,-0.01222229,-0.010505676,-0.02255249,0.028656006,-0.013793945,0.023071289,-0.006095886,-0.02319336,0.019744873,0.00680542,-0.012069702,0.026062012,0.0034160614,0.025802612,0.045318604,0.008590698,-0.038726807,0.022720337,-0.005493164,0.0070495605,-0.012710571,0.043121338,0.025039673,-0.0047416687,-0.017913818,-0.009513855,-0.0184021,-0.019363403,0.009170532,0.008621216,0.0088272095,-0.003868103,-0.03378296,0.016647339,0.011932373,-0.024887085,-0.014404297,0.0065956116,0.008804321,-0.038635254,0.025146484,0.027328491,0.056030273,-0.01737976,0.0059394836,-0.0010080338,0.036621094,0.032318115,0.020141602,-0.0070762634,0.016479492,-0.013244629,0.0027599335,-0.008155823,-0.010437012,0.022521973,0.0054130554,0.018447876,0.021362305,0.0061798096,-0.015289307,-0.029693604,0.01777649,-0.02722168,-0.03314209,0.025039673,0.0104522705,0.017990112,-0.034118652,0.018463135,0.012023926,-0.008796692,-0.013832092,0.0035533905,0.04208374,-0.008300781,-0.006034851,0.022949219,0.013038635,0.027786255,-0.060302734,-0.0060424805,0.012077332,0.0053863525,-0.021850586,-0.045715332,-0.0362854,0.00844574,0.041809082,0.007904053,0.029205322,0.032989502,0.005218506,0.015853882,0.018096924,-0.0042648315,-0.016082764,-0.011329651,-0.056549072,-0.017425537,-0.015548706,-0.0016679764,-0.026351929,0.008995056,0.0014629364,-0.03591919,0.007835388,-0.0010957718,-0.00040769577,-0.008666992,0.008636475,0.04864502,0.0031051636,0.015655518,-0.023498535,-0.02999878,-0.010986328,-0.0038166046,0.024765015,-0.042877197,0.0027256012,-0.017166138,-0.0034923553,0.004436493,0.008659363,0.01486969,0.022994995,0.019882202,0.03567505,-0.04711914,0.059326172,-0.040496826,0.02507019,0.0044822693,-0.046875,-0.010681152,-0.02796936,-0.004501343,0.03643799,-0.03250122,-0.002960205,-0.026107788,-0.03930664,0.0014543533,-0.05810547,0.015022278,0.032562256,0.041290283,-0.023132324,-0.0015792847,0.0042381287,-0.0031394958,-0.020874023,0.0073890686,-0.021774292,0.017105103,0.019744873,0.0068130493,-0.024795532,-0.032928467,-0.011398315,0.0029563904,-0.047851562,-0.058746338,-0.013137817,0.0019016266,-0.01927185,-0.017486572,-0.018508911,-0.04071045,-0.006954193,-0.0395813,0.016204834,0.00090932846,0.024215698,0.008712769,-0.020645142,-0.0046310425,0.0046463013,-0.018630981,0.034973145,-0.0008325577,-0.004924774,-0.040008545,0.00002014637,0.015563965,0.016464233,-0.014587402,-0.013801575,-0.008071899,-0.015777588,-0.05404663,0.008087158,-0.008468628,-0.00919342,-0.010910034,0.010406494,-0.054504395,-0.005558014,-0.025604248,0.0008249283,0.021987915,0.013687134,0.011581421,-0.006088257,0.011291504,-0.0084991455,-0.014152527,-0.021194458,0.012062073,0.009933472,0.012031555,0.030715942,0.03375244,-0.003206253,-0.024383545,0.0061187744,0.017349243,0.013320923,-0.0287323,0.0066833496,-0.02078247,0.014160156,-0.016967773,0.0023517609,-0.02458191,-0.0068626404,0.077819824,0.0013360977,-0.01739502,-0.0044555664,-0.020568848,0.009780884,0.023757935,-0.055877686,-0.007408142,-0.030578613,0.014434814,-0.029067993,0.006954193,-0.0027160645,0.01940918,-0.020553589,-0.059387207,-0.01651001,-0.00982666,-0.017196655,-0.06555176,-0.022583008,-0.07373047,0.017242432,-0.01436615,-0.013534546,0.00029873848,0.0045776367,-0.016433716,-0.082092285,0.0050811768,0.054656982,-0.0033607483,0.02067566,-0.009567261,0.01739502,0.03225708,-0.025360107,0.0032196045,0.022415161,-0.029129028,-0.023757935,-0.02017212,0.02079773,-0.008682251,-0.004425049,0.015533447,0.0075302124,0.006362915,-0.009338379,0.015525818,-0.0033035278,0.030227661,-0.015205383,0.015571594,-0.00945282,-0.0066070557,0.03866577,-0.042144775,0.028076172,0.012641907,0.0010881424,0.005542755,0.026794434,0.047180176,-0.030563354,-0.020690918,0.023132324,-0.0014953613,0.032562256,-0.028656006,0.046966553,0.012001038,-0.010253906,0.0054626465,-0.011436462,-0.016067505,-0.021957397,-0.034698486,0.03378296,0.011558533,0.006702423,-0.008277893,0.008659363,0.021972656,0.0018453598,0.007434845,-0.0028591156,-0.017822266,-0.010032654,0.008956909,-0.002521515,0.0040740967,-0.0006246567,0.032714844,0.018707275,0.03451538,0.0011959076,-0.016723633,0.0012969971,0.031173706,-0.009269714,0.008430481,0.028076172,0.0046463013,0.0234375,0.016677856,0.004966736,-0.046844482,-0.016433716,-0.023757935,-0.01927185,0.0011444092,-0.015037537,-0.007663727,-0.0032615662,0.010040283,-0.01789856,-0.027069092,-0.0036811829,-0.032928467,-0.014266968,0.0016403198,-0.010917664,0.023040771,-0.0011739731,0.0012693405,-0.0011110306,-0.008178711,0.04711914,-0.011116028,-0.008636475,0.04156494,0.030944824,0.018981934,-0.028686523,-0.012199402,-0.015213013,-0.011817932,0.007041931,-0.043884277,0.008178711,0.05557251,-0.0151901245,0.002664566,-0.0036506653,0.023452759,0.0025367737,0.003780365,-0.008712769,0.008369446,-0.0011291504,0.03274536,-0.04638672,0.02357483,0.0072021484,-0.004611969,-0.02545166,-0.02104187,-0.019561768,0.016860962,0.0014333725,0.00080537796,0.050720215,0.0050315857,0.018493652,-0.015991211,-0.012664795,0.016998291,-0.028808594,-0.024993896,0.02255249,-0.007095337,0.0071411133,0.008735657,-0.021499634,0.036621094,-0.032714844,0.015571594,0.0003592968,0.009346008,-0.0012598038,-0.016143799,-0.016159058,-0.009223938,-0.0037593842,0.009819031,-0.012817383,0.039276123,0.023345947,0.032226562,0.05480957,0.02357483,-0.008453369,-0.043762207,-0.017501831,-0.005470276,-0.017913818,0.010124207,-0.0038414001,0.047943115,0.029296875,0.011116028,0.02368164,0.029663086,0.038391113,0.010322571,0.007926941,-0.016464233,0.007583618,-0.002105713,0.03262329,-0.0070228577,0.036987305,-0.03817749,0.019302368,0.01852417,0.024673462,-0.026351929,0.028320312,0.064331055,0.013175964,-0.0041275024,0.04562378,-0.0044136047,-0.0034160614,-0.008369446,-0.019104004,0.052124023,0.016052246,0.042053223,0.052703857,0.013832092,-0.012397766,0.020477295,-0.03112793,-0.029067993,0.072021484,0.0289917,-0.027175903,-0.024673462,-0.008796692,0.009056091,-0.049926758,-0.022872925,0.02053833,-0.007286072,0.0050315857,-0.01083374,-0.020935059,-0.024658203,0.0018873215,0.018310547,0.011199951,-0.019088745,0.02999878,0.022399902,0.0033130646,0.031341553,0.00015473366,0.022583008,-0.021270752,-0.029281616,0.012893677,0.022003174,-0.014122009,-0.0099105835,0.021194458,0.0074539185,0.037139893,0.04046631,-0.02078247,0.011634827,0.025299072,0.019546509,-0.0059127808,0.051513672,0.04159546,0.009353638,0.03213501,0.030685425,0.038269043,-0.0395813,0.018859863,0.009963989,0.013366699,0.0035305023,-0.0077171326,0.0062446594,-0.014572144,0.013931274,-0.013511658,-0.019989014,0.024002075,0.02381897,-0.011329651,-0.007068634,-0.0010290146,0.01184082,-0.01838684,-0.0026340485,0.012268066,-0.020477295,0.031585693,0.01184845,0.034484863,-0.025238037,0.020019531,-0.0016565323,-0.015151978,-0.0006198883,0.013549805,-0.04119873,0.00014722347,-0.0061149597,-0.00024032593,-0.041900635,0.0056419373,0.026611328,-0.01739502,0.026763916,0.0073432922,0.0020751953,-0.0050697327,0.022537231,0.010810852,0.0015439987,-0.006011963,-0.02217102,0.028762817,0.03793335,-0.004348755,0.0059890747,-0.026885986,0.0010719299,-0.0001386404,-0.004535675,0.0050849915,-0.007701874,-0.030227661,-0.008171082,0.016357422,0.028533936,0.028564453,0.0413208,-0.022491455,-0.027069092,0.005138397,0.03540039,0.008453369,0.0022449493,-0.00020992756,0.026733398,-0.015899658,0.03869629,0.03765869,0.011276245,0.035095215,0.004211426,-0.012054443,0.017608643,-0.0128479,0.02822876,-0.015022278,0.0064086914,-0.0072021484,0.029846191,-0.008506775,-0.024871826,0.010276794,-0.015655518,-0.026321411,-0.023727417,0.0118255615,0.0026931763,0.02381897,0.035369873,0.024475098,-0.026428223,0.0619812,-0.0060272217,0.043548584,0.0029850006,-0.016098022,0.045806885,0.01927185,0.037597656,0.022369385,0.0072669983,-0.033203125,0.012397766,0.043518066,0.030761719,0.010566711,0.0077667236,-0.01197052,0.035095215,-0.00058221817,0.028198242,-0.0073242188,0.0024299622,0.0066223145,0.0026779175,-0.0075187683,-0.00006431341,-0.009918213,0.00016188622,0.049102783,-0.016738892,-0.0040512085,-0.026687622,-0.008552551,0.027374268,-0.005130768,0.002412796,-0.012962341,-0.01625061,0.00983429,-0.023803711,-0.034362793,0.0068893433,0.029663086,-0.0463562,-0.017745972,0.0016870499,0.031677246,-0.025024414,0.032928467,0.026245117,-0.0045166016,-0.001420021,0.04397583,-0.011398315,0.022491455,-0.0034923553,0.030975342,0.029525757,0.013832092,-0.0181427,-0.006916046,-0.002981186,-0.0045318604,0.018493652,0.026733398,-0.021697998,0.005558014,-0.0059127808,-0.0017433167,-0.0034294128,0.001750946,-0.01260376,0.01651001,-0.008842468,-0.008071899,0.00422287,0.0068588257,0.0079574585,0.0010509491,-0.010108948,-0.014160156,0.0082092285,0.027923584,0.022476196,-0.029129028,-0.0026187897,0.007873535,0.010238647,-0.023956299,-0.0049858093,-0.0023174286,-0.030273438,0.018203735,0.017669678,0.007331848,0.019973755,-0.02468872,-0.001329422,0.025421143,0.0041656494,0.020217896,0.0014228821,-0.008270264,0.005176544,-0.006919861,-0.017623901,-0.0074157715,-0.011047363,0.005332947,0.024963379,0.003604889,-0.025848389,0.029174805,0.0066986084,0.01864624,0.0060768127,-0.017089844,0.022720337,-0.009895325,-0.0036182404,0.00920105,0.014404297,-0.012374878,-0.0018825531,-0.015472412,0.039764404,0.05783081,-0.0035572052,-0.015945435,0.018844604,0.019866943,0.019760132,0.038330078,0.005218506,0.045806885,0.019805908,-0.013435364,-0.0137786865,0.020309448,-0.0015230179,-0.030731201,0.022003174,-0.012191772,-0.005420685,0.017105103,0.016403198,0.0031909943,-0.02758789,-0.011436462,-0.013755798,-0.0030498505,0.012199402,-0.007865906,0.019851685,-0.016311646,-0.007736206,0.009681702,-0.03326416,-0.055419922,-0.019012451,-0.0004682541,-0.011711121,-0.059417725,0.00043463707,-0.028839111,0.0073127747,-0.029525757,-0.007144928,-0.023422241,0.013343811,-0.020355225,-0.008987427,0.0032157898,0.01499939,0.023590088,-0.0039711,0.0154418945,-0.033843994,-0.0066223145,-0.019866943,0.012573242,-0.015007019,0.014480591,0.013839722,0.030380249,0.019638062,-0.013282776,-0.0017194748,-0.014678955,-0.008171082,-0.009666443,-0.015327454,-0.02645874,0.026229858,0.015022278,-0.014602661,-0.015434265,0.030410767,-0.029174805,-0.005214691,0.02519226,0.044921875,0.010673523,0.02545166,-0.013038635,-0.0021419525,-0.013999939,-0.0017852783,-0.016494751,0.00081157684,0.014587402,-0.0040245056,-0.0038642883,0.007911682,0.01473999,-0.007873535,-0.010261536,0.03338623,0.018112183,-0.019622803,0.034332275,0.012634277,0.007221222,-0.013679504,-0.013763428,0.0259552,0.05316162,0.009918213,0.013153076,-0.00060510635,0.0039520264,-0.005329132,0.015098572,0.018981934,-0.02255249,-0.057678223,-0.025772095,-0.036071777,0.020339966,0.0010576248,0.009796143,-0.0012197495,0.017150879,-0.021591187,-0.030014038,-0.017700195,0.03289795,0.017227173,-0.008987427,-0.013191223,0.012748718,0.025039673,-0.04196167,-0.0056533813,-0.039916992,-0.026245117,-0.008636475,-0.020614624,0.020370483,0.009918213,-0.004421234,0.004310608,-0.009521484,-0.00013422966,0.003419876,0.032043457,-0.011726379,0.003643036,0.028839111,0.020217896,-0.025283813,0.021194458,-0.011161804,-0.0039138794,0.009399414,-0.0065612793,0.015419006,-0.02078247,0.03616333,-0.016433716,0.01121521,0.034851074,-0.013458252,0.0043640137,-0.02619934,0.000034928322,0.0073509216,-0.010063171,0.036895752,-0.025848389,-0.013763428,0.0056915283,-0.008995056,-0.023101807,0.00043225288,0.019256592,0.03942871,-0.0037593842,0.053375244,-0.020233154,0.0018043518,0.01272583,0.0053977966,-0.020217896,0.012794495,0.02645874,0.006576538,0.006378174,-0.0030841827,-0.0034122467,-0.03744507,-0.0044021606,0.01977539,-0.003271103,-0.012702942,0.0368042,0.014793396,0.048706055,-0.0055007935,0.01776123,0.017837524,0.0040245056,0.024276733,-0.0069084167,0.054656982,-0.008682251,-0.02532959,0.0048561096,0.0037174225,-0.025787354,-0.0027713776,-0.0009212494,-0.0055007935,-0.042877197,0.0076789856,-0.015899658,0.02078247,-0.02796936,0.006385803,-0.023513794,-0.011878967,-0.03866577,-0.01348114,-0.026565552,0.008621216,0.033843994,0.00447464,0.03515625,0.0036087036,-0.021118164,0.027816772,0.049743652,0.0019874573,-0.025619507,-0.02458191,0.016235352,0.0008301735,0.010437012,0.004875183,-0.018508911,-0.009552002,-0.0067367554,-0.0084991455,0.014457703,-0.0075302124,0.019363403,0.0069274902,0.009109497,-0.007320404,0.019989014,-0.0045776367,-0.013931274,0.021011353,0.006641388,0.04019165,0.03930664,-0.021881104,0.02180481,0.008712769,-0.045776367,0.056549072,0.004611969,0.031341553,-0.01637268,0.012588501,-0.04046631,-0.030380249,-0.015853882,0.009307861],"createdAt":"2026-04-18T18:44:36.952Z","updatedAt":"2026-04-22T16:31:14.142Z","lastSeenAt":"2026-04-22T16:31:14.142Z","tsv":"'/api/v1/charges/20':104 '/request':13,30 '0.02':12,29,123,175 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':237 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':241 '20':116 '6':127 'accept':229 'access':110 'across':50 'address':236 'advertis':133 'ai':143 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':53 'analysi':147 'analyt':52,137 'api':5,15,22,32,41,80,109,186 'attach':91 'base':8,25,70,118,243 'base network api' 'broad':46 'call':4,21,130 'caller':89 'categori':134 'challeng':219 'charg':112 'classif':150 'commit':88 'confirm':226 'connect':195 'content':201 'contract':240 'convers':167 'conversion' 'crypto pay api' 'crypto-gas-estimates' 'data':51,136,140 'data-analytics' 'decim':128 'detail':212 'doc':185 'document':180,213 'embed':151 'enabl':40 'endpoint':49,60,102,171,216,228 'estim':161 'exampl':209 'exchang':156 'exchange-rates' 'export':141 'extrem':182 'feed':155 'financ':152 'finance-prices' 'finance/crypto':55 'form':225 'gas':160 'generat':168 'geocod':165 'geocoding' 'given':124 'header':96 'i.e':122 'includ':135 'infer':54 'infrastructur':163 'insight':142 'key':16,33,81 'learn':145 'limit':84 'list':106,170 'live':221 'low payment fee' 'lowpaymentfee.com':35 'machin':144 'maximum':114 'metric':138 'micropayment api' 'network':9,26,71 'no-auth api' 'offer':44 'openapi':205 'page':190 'pay':2,19,63 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':62 'payment':95,234 'per':3,20,64,129,177 'per-request':176 'platform':6,23,42,132 'post':230 'premium':108 'price':154,179,187 'prompt':197 'protocol':76 'quot':159 'rate':83,157 'readm':189 'render':192 'report':139 'request':65,99,178,231 'request/response':208 'requir':17,34 'schema':206 'sentiment':146 'servic':58 'set':47 'settl':72,233 'share':172 'simpli':90 'spars':183 'specif':101 'subscript':87 'summar':149 'text':148 'token':158 'unit':119 'usdc':67,121,125,239 'usdc api' 'usdc-base' 'use':66,238 'util':57,164 'valid':166 'validation' 'via':10,27,73 'wallet':196 'web3':153 'well':224 'well-form':223 'x':94 'x-payment':93 'x402':11,28,39,75,218 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"8cf5b463-76a7-43e9-a735-d599c15332c2","listingId":"25d7093a-3339-4dd4-b0a4-88ab0424fb10","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:36.952Z"}],"sources":[{"listingId":"25d7093a-3339-4dd4-b0a4-88ab0424fb10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:36.952Z","lastSeenAt":"2026-04-22T16:31:14.142Z"}],"details":{"listingId":"25d7093a-3339-4dd4-b0a4-88ab0424fb10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/20 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/20"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/20"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without managing API keys or subscriptions","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates via micropayments","Geocoding and data validation as utility microservices"],"bestFor":["AI agents that need keyless, pay-per-use API access","Developers prototyping with low-commitment, no-signup endpoints","Crypto-native applications already operating on Base network"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on Base network or unfamiliar with x402 payment protocol","Applications requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.883Z"},"updatedAt":"2026-04-22T16:31:14.142Z"}}