{"id":"28b84a95-8a67-4d10-9fb9-5e37cca8e010","shortId":"tLWhHs","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/carts/97` is listed as \"Premium API Access\" and requires a payment of up to 20,000 units of USDC (asset 0x8335…2913, which has 6 decimals, so this equals $0.02) per request. Payment is made via an `X-PAYMENT` header using the x402 \"exact\" scheme, settling on-chain to address 0x1A2B…85F3.\n\nThe broader platform advertises four categories of APIs: 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint at `/api/v1/carts/97` is confirmed live (returns a proper 402 challenge), but what it actually returns upon successful payment is unknown. The \"carts/97\" path does not correspond to any of the advertised API categories, adding further ambiguity about this specific endpoint's purpose.","tags":[],"capabilities":["x402-payment-gating","usdc-on-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","402 payment required API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available","The endpoint path /api/v1/carts/97 does not correspond to any of the advertised API categories — its actual functionality is unknown","No request body schema or response schema documented; callers cannot know what to send or expect back","Platform appears to be a generic x402 demo or storefront; actual API functionality behind payment wall is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/97","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/carts/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific endpoint path '/api/v1/carts/97' does not match any of the advertised API categories, making its purpose unclear. Pricing is inferrable from the challenge but little else is verifiable.","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":"2026-04-18T19:53:17.157Z","embedding":[-0.03933716,-0.020202637,0.012680054,0.004348755,0.019897461,-0.02645874,-0.03994751,0.018554688,0.06384277,-0.074401855,0.04147339,-0.05114746,-0.02708435,-0.031082153,-0.014541626,0.002565384,-0.0064048767,-0.0013666153,-0.048706055,0.038604736,0.043670654,-0.017715454,-0.02468872,0.022277832,-0.011772156,-0.024139404,0.007572174,0.003894806,-0.0050964355,-0.040985107,0.023620605,-0.03503418,-0.010437012,0.0084991455,-0.009353638,0.00069761276,0.0051841736,0.030715942,0.03390503,-0.011138916,-0.0067214966,-0.03942871,0.007369995,-0.024154663,-0.044921875,-0.008369446,0.014266968,-0.032562256,-0.021072388,-0.00983429,-0.035186768,-0.006713867,-0.021987915,0.018997192,0.000056028366,0.02355957,-0.029159546,-0.012397766,0.029388428,0.0048446655,-0.01965332,-0.046020508,-0.007698059,-0.01991272,0.013801575,0.058044434,-0.0062332153,0.036834717,0.0012845993,0.070251465,0.0395813,0.040985107,0.028198242,-0.008323669,0.012023926,-0.021591187,-0.013008118,0.06933594,-0.022888184,-0.022277832,-0.01701355,-0.005958557,-0.055023193,-0.028427124,-0.014663696,-0.07891846,-0.011489868,0.023880005,-0.03173828,0.03302002,-0.09259033,0.0031414032,-0.024353027,0.006427765,-0.0016336441,-0.0012874603,-0.007843018,0.015327454,-0.002336502,0.0011758804,-0.007736206,-0.047058105,0.033203125,0.012702942,0.06210327,0.05218506,0.0124053955,0.024291992,0.0042419434,-0.035247803,-0.026794434,0.00049495697,-0.041107178,0.001783371,0.018508911,0.016799927,-0.018554688,0.021957397,-0.032073975,0.021240234,-0.059570312,0.044830322,0.030883789,-0.009719849,-0.007045746,-0.046325684,-0.029159546,-0.0065612793,-0.007183075,-0.016937256,0.009529114,-0.0022239685,0.022003174,-0.026535034,-0.029556274,0.0026168823,-0.013626099,-0.026947021,-0.047668457,0.0012569427,0.048797607,-0.04067993,0.023666382,0.030578613,-0.085632324,-0.0029144287,-0.042999268,0.012336731,-0.035583496,-0.011016846,-0.00041341782,0.028198242,-0.008308411,-0.03591919,-0.012062073,-0.02079773,-0.0151901245,0.03604126,0.0021686554,0.031341553,-0.022216797,0.012062073,0.00056028366,0.012741089,0.0032176971,0.03869629,-0.018569946,-0.07879639,-0.07720947,-0.018814087,-0.0035858154,-0.011253357,-0.03704834,-0.0005736351,-0.00023555756,-0.068847656,-0.028396606,-0.024230957,-0.000030755997,-0.04260254,-0.019317627,-0.021850586,0.0008711815,-0.0077438354,-0.057037354,-0.007587433,-0.008552551,0.05429077,0.013702393,0.01638794,0.0129776,0.0054893494,0.05883789,0.033843994,-0.011550903,-0.025146484,0.008895874,-0.025527954,0.047027588,0.0046653748,0.017196655,-0.027908325,0.058502197,0.064941406,-0.01083374,-0.021118164,-0.0009994507,-0.05130005,-0.040771484,-0.025497437,0.00390625,-0.0024108887,-0.034698486,0.055603027,-0.034698486,-0.037750244,0.004840851,0.009147644,0.017349243,0.079956055,0.0022735596,0.025772095,0.009254456,0.021942139,-0.04699707,0.051879883,0.033416748,0.0129852295,-0.018630981,-0.024368286,0.041534424,0.05166626,-0.035614014,0.011436462,-0.017074585,0.018295288,-0.0055770874,-0.0010871887,0.026535034,-0.022506714,-0.028915405,-0.023452759,-0.018035889,0.012336731,0.0012025833,-0.036071777,-0.030380249,-0.095581055,0.04220581,0.03363037,0.018829346,0.017700195,-0.00094127655,-0.019424438,-0.009605408,-0.06921387,0.04095459,0.05545044,-0.00598526,-0.009750366,0.039367676,-0.008850098,-0.03857422,-0.0023651123,0.0031795502,-0.026107788,-0.020385742,0.018997192,-0.05038452,0.0044822693,0.03277588,0.03842163,0.05480957,-0.021453857,-0.049835205,-0.021957397,-0.011276245,-0.007881165,-0.03491211,-0.007873535,-0.014152527,0.011886597,0.038360596,0.015396118,0.017578125,0.0049743652,0.02142334,0.011268616,-0.0058135986,-0.019607544,-0.010627747,0.021118164,0.012138367,-0.08770752,0.010673523,-0.0063095093,0.076416016,-0.043182373,0.031799316,-0.024627686,0.028305054,0.03567505,-0.014945984,-0.029846191,0.0025081635,0.03479004,0.03555298,0.027755737,0.013969421,0.008918762,-0.01171875,0.06512451,-0.020446777,-0.006626129,-0.0069351196,0.02128601,0.029388428,-0.012878418,-0.030380249,-0.051452637,-0.00995636,-0.0524292,0.026657104,-0.024398804,0.031951904,-0.014831543,0.015510559,-0.013717651,0.009971619,-0.039520264,-0.00040721893,-0.000074505806,0.0061683655,-0.008132935,-0.035369873,0.015716553,0.026428223,-0.02784729,0.0026836395,0.029815674,0.024871826,-0.009147644,-0.035888672,-0.046203613,-0.014945984,-0.00060749054,0.010650635,0.022964478,0.026138306,0.043914795,-0.040161133,-0.005329132,0.019989014,0.02671814,0.018615723,0.006965637,-0.011924744,-0.053466797,-0.046020508,-0.018417358,-0.031555176,0.032836914,0.0287323,0.0041122437,0.048614502,0.014762878,-0.019195557,-0.050109863,0.01979065,-0.035949707,0.007671356,0.034210205,-0.020217896,-0.066223145,0.016540527,0.012046814,0.0032844543,0.041412354,0.018508911,0.01222229,0.07293701,0.028198242,0.020492554,0.0075569153,0.03463745,0.036468506,0.007896423,-0.020370483,-0.025436401,-0.012634277,0.015312195,-0.054229736,-0.03640747,-0.067871094,0.04727173,0.014762878,0.09106445,-0.0062332153,0.012939453,0.037231445,0.00004351139,0.018051147,-0.031555176,-0.019195557,-0.040405273,-0.02609253,0.040039062,-0.0018177032,-0.0129852295,-0.0067863464,0.043518066,-0.0022964478,0.021911621,-0.023498535,0.053466797,-0.01576233,0.007511139,0.017440796,0.0051460266,0.046020508,0.068725586,-0.056640625,0.016921997,0.019454956,-0.033355713,0.00044107437,0.034454346,-0.009811401,-0.023895264,-0.058563232,-0.007587433,-0.004951477,-0.013282776,-0.049194336,0.0016002655,0.0005068779,0.039001465,0.0143585205,-0.01259613,-0.023956299,-0.010635376,-0.015075684,-0.03817749,-0.016281128,-0.050079346,0.0077705383,0.044128418,-0.035949707,-0.00026512146,-0.017456055,-0.019561768,-0.015792847,0.005859375,0.021270752,-0.026138306,-0.023956299,0.030227661,-0.011199951,0.0053863525,0.025268555,0.04498291,0.045135498,0.007472992,0.05090332,0.02420044,-0.01890564,-0.061584473,0.012298584,-0.034301758,0.011398315,0.014427185,-0.037475586,0.005142212,-0.011436462,-0.02017212,-0.016357422,0.011199951,-0.013900757,-0.007270813,0.021362305,-0.03387451,-0.030456543,-0.067993164,-0.028121948,0.0042800903,0.06750488,0.008705139,0.0033607483,-0.048553467,-0.009338379,0.012069702,0.009094238,0.019485474,-0.017105103,-0.012290955,-0.0041618347,-0.03286743,-0.01965332,-0.02708435,0.037322998,-0.006668091,-0.021606445,0.028274536,0.0039138794,0.018585205,-0.001408577,-0.003211975,0.018585205,-0.020629883,-0.01889038,-0.023742676,0.026535034,0.0033073425,-0.0048065186,-0.03250122,0.049987793,0.009269714,0.03945923,-0.045684814,-0.0035743713,-0.02029419,0.011444092,0.025741577,-0.021896362,-0.0047035217,0.0062026978,-0.031402588,-0.07232666,0.01689148,-0.013999939,0.019226074,0.008132935,0.009819031,0.029785156,-0.0064315796,0.017959595,0.013015747,-0.016738892,0.0017728806,-0.040374756,-0.029815674,-0.0362854,-0.00069475174,-0.020584106,0.02166748,-0.015625,0.008323669,-0.01890564,-0.017715454,0.05227661,0.014778137,-0.0066375732,0.031311035,0.017211914,0.01638794,0.050689697,0.018692017,-0.046051025,0.012252808,0.008483887,-0.009857178,0.011024475,0.059326172,0.022094727,-0.022644043,-0.00042366982,-0.008415222,-0.010650635,-0.022384644,-0.015357971,-0.001420021,0.029296875,-0.0031280518,-0.029327393,0.016571045,0.019073486,-0.03286743,-0.010566711,0.0054740906,0.020065308,-0.049316406,0.024627686,0.02748108,0.050109863,-0.039001465,0.017608643,0.005432129,0.032562256,0.018463135,0.006454468,-0.011650085,0.008255005,-0.015258789,0.011924744,-0.007820129,-0.005683899,0.009994507,0.0075302124,0.016983032,0.02885437,0.021820068,-0.040740967,-0.024169922,0.0146102905,-0.027557373,-0.022842407,0.027740479,0.029449463,0.017181396,-0.016937256,0.026626587,0.014762878,-0.016677856,-0.021835327,-0.015396118,0.032958984,-0.02357483,-0.012611389,0.021392822,-0.0016889572,0.024765015,-0.05328369,-0.0037822723,0.0035095215,0.0073547363,-0.011886597,-0.030914307,-0.039245605,-0.008132935,0.036376953,0.020217896,0.01309967,0.01499176,0.0048446655,0.007537842,0.00970459,-0.017456055,-0.009597778,-0.007858276,-0.038208008,-0.010284424,-0.008743286,0.018737793,-0.031280518,0.013381958,-0.007247925,-0.027877808,0.0034122467,-0.018096924,0.0039520264,-0.008407593,0.0014104843,0.023956299,0.001660347,0.022827148,-0.017852783,-0.03265381,0.009292603,0.005672455,0.024841309,-0.045928955,0.02658081,-0.010192871,-0.008804321,0.003944397,0.020629883,0.023406982,0.028121948,0.02180481,0.033935547,-0.037872314,0.043792725,-0.02420044,0.018539429,0.001707077,-0.021591187,-0.0178833,-0.021911621,-0.0206604,0.045776367,-0.024627686,-0.0021686554,-0.021484375,-0.028152466,-0.0029468536,-0.044830322,0.033447266,0.044921875,0.048187256,-0.026687622,0.0029315948,0.015525818,0.017227173,-0.015625,-0.013069153,-0.005405426,0.01889038,0.018600464,-0.00058460236,-0.033111572,-0.019485474,0.010406494,0.014930725,-0.06237793,-0.05050659,-0.00409317,0.00982666,-0.0076789856,-0.01222229,-0.006626129,-0.040740967,0.001704216,-0.03692627,0.007381439,-0.0024356842,0.008674622,0.02218628,-0.040740967,0.00020110607,0.008232117,-0.021865845,0.029281616,-0.012321472,-0.016860962,-0.044006348,0.004470825,0.011978149,0.0104522705,-0.009811401,-0.014862061,-0.0023403168,-0.027938843,-0.05126953,-0.0038986206,-0.018493652,-0.0048713684,-0.00071811676,0.00083971024,-0.048950195,-0.00011610985,-0.03164673,-0.0031089783,0.011161804,-0.0010414124,0.0060424805,-0.0070877075,0.008399963,-0.023254395,-0.01651001,-0.035858154,0.015510559,0.013305664,0.0062675476,0.024032593,0.034698486,-0.009902954,-0.010253906,0.0035381317,0.006916046,0.029251099,-0.010345459,0.014381409,-0.03515625,0.01675415,-0.0006656647,-0.0073547363,-0.029052734,-0.004611969,0.056427002,0.013809204,0.0039024353,0.002445221,-0.012680054,0.014945984,0.032989502,-0.040222168,-0.0051994324,-0.039733887,0.035980225,-0.017120361,0.012504578,-0.0030059814,0.00774765,-0.016296387,-0.04144287,-0.003080368,0.008323669,-0.0012626648,-0.0703125,-0.01838684,-0.05657959,-0.0047073364,-0.0211792,-0.035614014,-0.01977539,0.016082764,-0.0015516281,-0.097839355,-0.0021800995,0.056915283,0.00023162365,0.033294678,-0.010017395,0.020126343,0.033355713,-0.0287323,0.0028438568,0.021148682,-0.017059326,-0.031280518,-0.008705139,0.029327393,-0.00011599064,-0.026611328,0.0062561035,0.015357971,0.031188965,-0.0062065125,0.025756836,-0.0072631836,0.013626099,-0.00036144257,0.017837524,-0.01713562,-0.0027065277,0.047790527,-0.05731201,0.027023315,0.003917694,0.005592346,0.006450653,0.03012085,0.040985107,-0.038269043,-0.0044403076,0.048553467,0.013587952,0.038482666,-0.017837524,0.038879395,-0.00026512146,-0.003358841,0.011375427,-0.019104004,-0.017562866,-0.04284668,-0.03540039,0.027297974,0.004196167,0.013366699,-0.015174866,-0.015060425,0.024993896,0.0022659302,0.0025405884,-0.02053833,-0.0206604,-0.029663086,0.0024356842,0.017303467,-0.0000910759,0.0076942444,0.026855469,0.016281128,0.0335083,0.013343811,-0.0009841919,0.0007581711,0.030578613,-0.01020813,0.0034770966,0.01977539,0.019073486,0.008682251,0.01826477,0.00983429,-0.04019165,-0.013534546,-0.023132324,-0.03439331,-0.0053215027,-0.018417358,-0.007789612,-0.0025100708,0.0107803345,-0.018417358,-0.03744507,0.0006380081,-0.02722168,-0.011001587,-0.0031776428,-0.006160736,0.027526855,0.018447876,0.0076293945,0.00598526,-0.0066070557,0.051879883,0.0035877228,-0.0067253113,0.024795532,0.021575928,0.009757996,-0.0181427,-0.015731812,-0.00012153387,-0.021209717,0.0048179626,-0.023071289,0.0032920837,0.032165527,-0.009315491,-0.0023555756,0.000007867813,0.032684326,0.0076141357,0.0040016174,-0.0040283203,0.013687134,-0.030090332,0.040771484,-0.051849365,0.012214661,0.010612488,0.0062217712,0.006664276,-0.017562866,-0.03125,0.012237549,-0.0011548996,0.00052785873,0.045318604,-0.0065345764,0.027145386,-0.023849487,-0.045440674,0.00072431564,-0.016204834,-0.016586304,0.019485474,-0.0064849854,0.005050659,0.016159058,-0.038909912,0.030975342,-0.040924072,0.0021133423,-0.0072402954,-0.0055389404,0.002620697,-0.017532349,-0.00868988,-0.006187439,-0.023498535,0.00047945976,-0.00091552734,0.03982544,0.038360596,0.032562256,0.027145386,0.020599365,0.008140564,-0.04574585,-0.024627686,-0.00065612793,-0.022994995,0.017150879,-0.011253357,0.049591064,0.03878784,0.013252258,0.03074646,0.02709961,0.04800415,-0.009811401,0.013465881,-0.018249512,0.02406311,-0.0151901245,0.016464233,0.0051841736,0.03869629,-0.040527344,0.019561768,0.0016450882,0.014183044,-0.01638794,0.026351929,0.07556152,0.026794434,0.013092041,0.022369385,-0.012741089,-0.0138549805,-0.0143966675,-0.02178955,0.054382324,0.007587433,0.050109863,0.035705566,0.011192322,-0.009780884,0.015129089,-0.02003479,-0.020935059,0.036193848,0.023895264,-0.015541077,-0.00579834,-0.011672974,0.014137268,-0.04373169,-0.013549805,0.0069503784,0.019866943,0.014480591,-0.009979248,-0.009254456,-0.017715454,-0.006034851,0.0032844543,0.014724731,-0.014122009,0.011817932,0.013191223,0.00048160553,0.024032593,-0.01033783,0.033294678,-0.022644043,-0.02418518,0.012275696,0.010032654,-0.00062799454,0.0054130554,0.029663086,0.003232956,0.038269043,0.035491943,-0.026885986,-0.016281128,0.016738892,0.014564514,-0.00096940994,0.04537964,0.029190063,0.023773193,0.032318115,0.033447266,0.027236938,-0.03125,0.020858765,0.004501343,0.009796143,-0.0040740967,-0.017120361,0.0070266724,-0.011146545,0.0025367737,0.007347107,-0.021957397,0.020584106,0.012626648,-0.011199951,0.0002105236,0.0017166138,0.020309448,0.0024433136,-0.0017185211,0.004558563,-0.0045394897,0.014480591,0.010299683,0.024215698,-0.017669678,0.024841309,-0.00012397766,-0.03164673,-0.0033779144,0.017166138,-0.022735596,0.0013666153,-0.009506226,-0.0004017353,-0.04208374,0.0029411316,0.0076446533,-0.0053138733,0.017669678,0.008140564,-0.0054092407,-0.011772156,0.018997192,0.018325806,-0.009384155,-0.008972168,-0.03149414,0.030227661,0.033843994,-0.0008068085,-0.004886627,-0.011779785,-0.0043296814,0.012329102,-0.014625549,0.003932953,0.0056152344,-0.011680603,-0.024993896,0.018875122,0.023803711,0.032836914,0.037750244,-0.020690918,-0.018325806,-0.0115737915,0.02709961,0.01914978,0.012992859,-0.0064964294,0.008628845,-0.010597229,0.048187256,0.019989014,0.01071167,0.024658203,-0.017562866,0.0027484894,0.0048217773,-0.016830444,0.026763916,-0.026290894,0.009376526,-0.007019043,0.021865845,-0.018600464,-0.04156494,0.02053833,-0.016113281,-0.03265381,-0.023529053,0.030044556,-0.011108398,0.013755798,0.017944336,0.036254883,-0.024215698,0.06896973,-0.01524353,0.05090332,0.002401352,-0.014808655,0.05618286,0.026184082,0.044067383,0.012008667,-0.0013399124,-0.018066406,-0.0012083054,0.035461426,0.02394104,0.011024475,-0.0027599335,-0.031311035,0.031799316,-0.011581421,0.03274536,-0.0044937134,0.0029640198,0.00869751,-0.009025574,-0.010108948,-0.0082092285,0.007133484,0.012840271,0.04824829,-0.005367279,-0.010787964,-0.021087646,-0.0259552,0.031463623,-0.0004785061,0.010604858,0.0022792816,-0.017990112,0.0082473755,-0.03543091,-0.015296936,0.01612854,0.02319336,-0.054595947,-0.0146484375,0.006160736,0.03152466,-0.035217285,0.032684326,0.014480591,-0.008178711,0.008972168,0.03552246,-0.011512756,0.029129028,-0.010093689,0.023345947,0.042510986,0.01776123,-0.025680542,-0.00198555,0.012672424,-0.0041885376,0.013168335,0.023757935,-0.009384155,0.0074882507,0.0005159378,-0.016403198,-0.0070762634,0.017578125,-0.0071144104,0.0024986267,-0.010826111,-0.014312744,0.0071258545,0.012550354,0.0063095093,0.0045547485,0.00299263,-0.014526367,-0.0026607513,0.044799805,0.0061836243,-0.04284668,0.001461029,0.016448975,0.016983032,-0.025054932,-0.009216309,-0.008811951,-0.04626465,0.02418518,0.025375366,0.010665894,0.0027256012,-0.03149414,0.008628845,0.020614624,0.008018494,0.02230835,0.010871887,-0.017593384,-0.0027008057,-0.019470215,-0.006252289,-0.011909485,-0.010383606,0.012588501,0.029953003,0.0032100677,-0.020462036,0.020080566,0.00080919266,-0.003074646,0.0033512115,-0.0031852722,0.01209259,-0.013595581,0.0006656647,-0.0045661926,0.0054397583,-0.014892578,-0.014175415,-0.028778076,0.037384033,0.054840088,-0.013244629,-0.02029419,0.008239746,0.020324707,0.030319214,0.04135132,0.006549835,0.0440979,0.023345947,-0.013305664,-0.024505615,0.017471313,-0.008476257,-0.012268066,0.014709473,-0.005718231,-0.02357483,0.02029419,0.008682251,-0.005622864,-0.027999878,-0.026947021,-0.0152282715,-0.022918701,0.011833191,0.008552551,0.0044174194,-0.030426025,-0.012374878,0.020721436,-0.03164673,-0.042266846,-0.013221741,-0.012763977,-0.013259888,-0.05923462,0.0036144257,-0.024215698,0.016281128,-0.026275635,0.016098022,-0.009979248,0.031799316,0.000114917755,-0.0016336441,0.016143799,0.02494812,0.024963379,0.006526947,0.025024414,-0.02418518,-0.017868042,-0.017959595,0.008346558,-0.021255493,0.0049591064,-0.01285553,0.0395813,0.010124207,-0.0033893585,0.0052948,-0.014709473,0.00090789795,-0.011291504,-0.03387451,-0.019317627,0.022323608,0.02986145,-0.005302429,-0.014961243,0.036071777,-0.027160645,0.00015985966,0.014709473,0.03201294,0.011856079,0.028778076,-0.003873825,-0.0034770966,-0.029953003,0.003396988,-0.009841919,0.009811401,0.007858276,-0.0005083084,0.010559082,0.017181396,0.011528015,-0.00831604,-0.017700195,0.027313232,0.026733398,-0.018737793,0.03567505,0.031311035,0.0023288727,-0.019577026,-0.012954712,0.024810791,0.05343628,-0.0034770966,0.019454956,-0.008735657,-0.0024929047,-0.008773804,0.012649536,0.011268616,-0.014381409,-0.041107178,-0.02168274,-0.025726318,0.030853271,-0.006072998,0.0033683777,0.004863739,0.021408081,-0.0082473755,-0.0357666,-0.025161743,0.02079773,-0.010139465,-0.0137786865,-0.012863159,0.0035991669,0.01965332,-0.024276733,-0.012489319,-0.059448242,-0.028045654,-0.017181396,-0.01878357,0.009254456,0.008865356,-0.017028809,0.010757446,-0.000065624714,0.00023269653,0.007949829,0.022705078,-0.018951416,0.0061569214,0.010063171,0.016799927,-0.02545166,0.027252197,-0.0119018555,-0.0039100647,0.019226074,-0.0036735535,-0.0032749176,-0.035705566,0.029846191,0.006351471,-0.0012559891,0.028686523,0.0077056885,0.012542725,-0.017456055,-0.014976501,-0.010932922,-0.0062561035,0.037963867,-0.014564514,-0.026565552,0.014678955,-0.016830444,-0.03125,0.0030670166,0.022415161,0.035827637,-0.009613037,0.045837402,-0.0022335052,0.0076789856,0.0154418945,0.007255554,-0.022842407,0.006248474,0.022323608,0.0044403076,0.015541077,-0.0028381348,-0.0069618225,-0.02784729,-0.004673004,0.017868042,-0.0032653809,-0.026351929,0.02281189,0.016571045,0.05218506,0.0019874573,0.010299683,0.029525757,-0.003112793,0.03829956,0.0022201538,0.03591919,0.0041389465,-0.025161743,-0.010139465,-0.0056915283,-0.012176514,0.004989624,-0.00017046928,-0.003967285,-0.031158447,0.001458168,0.0052452087,0.025390625,-0.012496948,0.009902954,-0.02053833,-0.008972168,-0.045074463,-0.0025539398,-0.023162842,0.0027694702,0.04727173,0.0236969,0.015510559,-0.005176544,-0.01826477,0.025634766,0.049926758,-0.0018825531,-0.030410767,-0.0066833496,-0.008232117,-0.012741089,-0.003364563,0.013343811,-0.027313232,-0.013412476,-0.0039024353,-0.015716553,0.008049011,-0.014709473,0.021072388,-0.0028972626,-0.0020103455,0.00034427643,0.012863159,0.0024108887,-0.010726929,0.0077056885,0.0051460266,0.029388428,0.037200928,-0.0209198,0.021194458,0.019622803,-0.038848877,0.041931152,-0.002614975,0.023239136,-0.017456055,0.017089844,-0.026046753,-0.010093689,-0.011940002,0.0062561035],"createdAt":"2026-04-18T18:32:15.882Z","updatedAt":"2026-04-23T23:01:54.994Z","lastSeenAt":"2026-04-23T23:01:54.994Z","tsv":"'/api':180 '/api/v1/carts/97':60,217 '/docs':179 '/pricing':181 '/readme':183 '/request':16,34 '0.02':15,33,89,160 '000':75 '0x1a2b':112 '0x8335':80 '20':74 '2913':81 '402':224 '402 payment required API' '6':84 '85f3':113 'Base network API' 'USDC API access' 'access':66 'actual':229 'ad':249 'address':111 'advertis':117,246 'ai':9,27,129 'ai-inference' 'ambigu':251 'analysi':133 'analyt':8,26,123 'api':4,22,46,65,121,165,247 'asset':79 'avail':210 'base':7,25,55 'broader':115 'call':45 'carts/97':237 'categori':119,248 'chain':109 'challeng':225 'classif':136 'classification' 'collect':40 'commit':173 'confirm':219 'connect':189 'convers':153 'correspond':241 'crawl':213 'crypto-quotes' 'data':122,126 'data-analytics' 'decim':85 'detail':196 'document':174,205 'embed':137 'embeddings' 'endpoint':13,31,47,59,156,215,255 'equal':88 'estim':147 'exact':104 'exampl':209 'exchang':142 'export':127 'extrem':176 'feed':141 'financ':10,28,138 'finance-data' 'four':118 'gas':146 'gate':3,21,48 'generat':154 'geocod':151 'geocoding' 'header':100 'host':38 'infrastructur':149 'insight':128 'key':166 'learn':131 'limit':169 'list':62,158 'live':220 'low payment fee API' 'lowpaymentfee.com':37 'machin':130 'made':94 'metric':124 'micropayment API' 'minimum':172 'network':56 'on-chain':107 'openapi':200 'page':184 'path':238 'pay':43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':70,92,99,233 'per':44,90,161 'platform':116 'premium':64 'price':140 'prompt':191 'proper':223 'protocol':52 'purpos':257 'quot':145 'rate':143,168 'render':186 'report':125 'request':91,162 'request/response':203 'requir':68 'return':221,230 'schema':204 'scheme':105 'sentiment':132 'sentiment-analysis' 'settl':106 'spars':177 'spec':201 'specif':58,254 'success':232 'suit':5,23 'summar':135 'technic':195 'text':134 'text-summarization' 'token':144 'unit':76 'unknown':235 'upon':231 'usag':208 'usdc':18,36,78 'usdc-on-base' 'use':101 'util':12,30,150 'utility-apis' 'valid':152 'via':17,35,95 'wallet':190 'web3':139 'x':98 'x-payment':97 'x402':2,20,51,103 'x402 API' 'x402-gated':1,19 'x402-payment-gating'","prices":[{"id":"f231428e-386f-4eb0-a7c7-8086084a9b56","listingId":"28b84a95-8a67-4d10-9fb9-5e37cca8e010","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/carts/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:15.882Z"}],"sources":[{"listingId":"28b84a95-8a67-4d10-9fb9-5e37cca8e010","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:15.882Z","lastSeenAt":"2026-04-23T23:01:54.994Z"}],"details":{"listingId":"28b84a95-8a67-4d10-9fb9-5e37cca8e010","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/97 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/97"},{"claim":"Platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/97"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting reports with per-request USDC micropayments","Using utility services like geocoding and data validation via crypto-native pay-per-use"],"bestFor":["Agents or developers who want keyless, pay-per-call API access settled in USDC on Base","Crypto-native applications that prefer on-chain micropayments over subscription billing","Quick prototyping where avoiding API key signup and rate limits is valuable"],"notFor":["High-volume production workloads where $0.02/request adds up and bulk pricing is needed","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.162Z"},"updatedAt":"2026-04-23T23:01:54.994Z"}}