{"id":"68e514d4-4d49-404b-9787-0176fbf64039","shortId":"Q66EQv","kind":"x402","title":"Pay-per-request API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/invoices/25) is described as \"Premium API Access\" and returned a live 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscription commitments required. The platform accepts payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a 300-second payment timeout.\n\nDocumentation is extremely sparse — 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 usage examples available from the crawl. The exact functionality behind the /api/v1/invoices/25 endpoint specifically is unclear, as it does not appear in the homepage catalog. Users should expect to experiment or contact the provider for details on individual endpoint behavior.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","data-export","analytics"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api gateway","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definitions found","The /api/v1/invoices/25 endpoint is not listed in the homepage API catalog; its specific function is unknown","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/25","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/invoices/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent (all doc pages show only 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and the specific /api/v1/invoices/25 endpoint is not listed in the homepage catalog, making its purpose unclear.","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":"2026-04-18T20:00:43.940Z","embedding":[-0.02178955,-0.023330688,0.032409668,0.00831604,0.005241394,-0.020889282,-0.038970947,0.023406982,0.062561035,-0.0657959,0.020065308,-0.059570312,-0.024093628,-0.053009033,0.0055885315,0.030792236,0.013656616,0.007575989,-0.047546387,0.044921875,0.03869629,-0.0047035217,-0.034576416,0.025177002,-0.019546509,-0.018234253,-0.010902405,0.0040359497,-0.004940033,-0.051574707,0.029327393,-0.031829834,-0.01133728,-0.0049057007,-0.009422302,-0.001200676,-0.015113831,0.049072266,0.019195557,-0.008720398,-0.02281189,-0.05621338,0.009300232,-0.00793457,-0.04046631,0.008705139,0.017532349,-0.015052795,-0.012023926,0.006866455,-0.045654297,0.016342163,-0.0023841858,-0.0028076172,0.018203735,0.019378662,-0.0126571655,0.0033454895,0.010261536,0.0004992485,0.020233154,-0.049041748,-0.04309082,-0.007671356,-0.009422302,0.057281494,-0.018875122,0.04852295,0.0021266937,0.056274414,0.03527832,0.0748291,0.03829956,0.011154175,0.0074653625,-0.022109985,0.011169434,0.05026245,-0.021148682,-0.024902344,-0.015365601,-0.018081665,-0.05871582,-0.015258789,-0.01890564,-0.055480957,-0.030578613,0.017425537,-0.021514893,0.017364502,-0.06652832,-0.0019817352,-0.02508545,0.0027942657,0.0038070679,-0.02633667,-0.012077332,0.011177063,-0.01939392,0.023803711,-0.0062789917,-0.04220581,0.007045746,0.0104522705,0.048614502,0.064208984,0.019866943,0.013328552,-0.000770092,-0.011619568,-0.042053223,0.017410278,-0.019226074,-0.022918701,0.0061302185,0.012542725,-0.026107788,0.012321472,-0.030838013,0.0035057068,-0.05996704,0.056274414,-0.0053634644,0.0040016174,0.0060272217,-0.05706787,-0.030517578,0.0002875328,-0.02154541,-0.012107849,0.015609741,0.01687622,0.023010254,-0.017120361,-0.025177002,0.014297485,-0.0072898865,-0.0011472702,-0.0395813,-0.0423584,0.030731201,-0.018478394,0.02368164,0.036956787,-0.10784912,-0.024047852,-0.052856445,0.00756073,-0.03353882,-0.018493652,-0.0035877228,0.022109985,-0.039886475,-0.026000977,-0.023620605,-0.019897461,-0.010307312,0.010246277,-0.012893677,0.036346436,-0.033996582,0.02418518,0.024551392,-0.017501831,0.01713562,0.035095215,-0.012519836,-0.08239746,-0.07385254,-0.028808594,-0.018493652,-0.028167725,-0.019226074,-0.00982666,0.00086545944,-0.05899048,-0.011795044,-0.016540527,0.012329102,-0.04373169,-0.0141067505,-0.009613037,0.010765076,-0.008071899,-0.041900635,-0.027938843,-0.039123535,0.072143555,0.026046753,0.03878784,0.034820557,-0.011756897,0.068115234,0.018585205,-0.010017395,-0.027832031,0.009048462,-0.0231781,0.010902405,-0.0006804466,0.013381958,-0.019439697,0.042114258,0.06793213,-0.009094238,-0.0074539185,-0.0042800903,-0.04135132,-0.04144287,-0.03378296,0.025741577,0.01878357,-0.0024337769,0.031585693,-0.04449463,-0.037231445,-0.016067505,0.021987915,0.024963379,0.058532715,0.020431519,-0.004016876,0.015472412,0.020858765,-0.031677246,0.05319214,0.021713257,0.0067977905,-0.029846191,-0.0340271,0.043395996,0.02571106,-0.020889282,0.022064209,-0.011428833,0.028457642,0.0047798157,0.0049057007,0.015586853,0.0017414093,-0.01878357,-0.013374329,-0.00724411,0.022155762,0.025100708,-0.014976501,-0.03253174,-0.0592041,0.057678223,0.030700684,0.037017822,-0.0039520264,-0.00015759468,-0.031082153,-0.021072388,-0.07745361,0.04397583,0.07293701,0.008514404,-0.016479492,0.01826477,0.009231567,-0.03857422,0.009140015,0.0013961792,-0.026489258,-0.00592041,0.01713562,-0.048339844,0.006664276,0.019134521,0.023040771,0.055511475,-0.014053345,-0.048919678,-0.014503479,0.017669678,-0.011817932,-0.035980225,0.015594482,-0.00856781,0.009651184,0.022399902,0.021820068,0.02331543,0.019439697,0.014892578,-0.01676941,0.0075149536,-0.012557983,-0.018005371,0.004322052,0.015777588,-0.05810547,0.030822754,-0.008972168,0.0703125,-0.056854248,0.04953003,-0.0048332214,0.014923096,0.038513184,-0.002407074,-0.041748047,0.012825012,0.04611206,0.0035305023,0.06640625,0.01889038,-0.027252197,0.0045700073,0.07092285,-0.02218628,0.012550354,0.014297485,0.004337311,0.046936035,-0.01739502,-0.040100098,-0.049591064,-0.0022258759,-0.03086853,0.044403076,-0.005859375,0.034118652,-0.0049591064,0.005859375,-0.010017395,-0.007904053,-0.03363037,0.011001587,-0.012786865,0.004722595,-0.006587982,-0.046569824,-0.0035362244,0.016845703,-0.005882263,0.009414673,0.04019165,0.01612854,-0.021942139,-0.026229858,-0.03866577,-0.020446777,-0.011749268,0.016540527,0.034454346,0.02583313,0.047576904,-0.03125,0.0049705505,0.02796936,0.008308411,0.037231445,0.0041923523,0.0048446655,-0.0692749,-0.043823242,-0.029571533,-0.044006348,0.03387451,0.01828003,-0.0025348663,0.05041504,0.008026123,-0.01374054,-0.03930664,0.030029297,-0.04776001,0.005367279,0.024642944,-0.01586914,-0.02999878,0.0020103455,-0.0021400452,0.004524231,0.032348633,0.0018205643,0.024887085,0.06774902,0.035186768,-0.002248764,0.016403198,0.025497437,0.03463745,0.016281128,-0.013946533,-0.019683838,0.002658844,0.03845215,-0.032348633,-0.035095215,-0.06933594,0.0574646,0.02494812,0.07104492,0.013999939,0.0074272156,0.039154053,-0.0077438354,0.0026416779,-0.016036987,-0.0043525696,-0.03451538,-0.029052734,0.034240723,-0.024154663,0.005252838,-0.026031494,0.038238525,-0.03048706,0.005012512,-0.019439697,0.036590576,-0.027359009,0.004386902,0.010688782,0.009765625,0.046081543,0.03262329,-0.0440979,-0.009475708,0.000992775,-0.048217773,-0.010185242,0.046081543,-0.011642456,-0.010055542,-0.045196533,-0.030899048,-0.022460938,-0.008331299,-0.0625,-0.007255554,-0.006565094,0.02218628,0.030059814,-0.012145996,-0.006313324,0.004184723,-0.023345947,-0.044799805,0.006000519,-0.051635742,0.0030670166,0.03366089,-0.009025574,-0.009841919,-0.009353638,-0.008834839,-0.0039520264,0.003648758,0.01776123,0.0020217896,-0.05038452,0.04650879,0.012054443,0.0034484863,0.018325806,0.040405273,0.040374756,0.021194458,0.0597229,0.009246826,-0.032318115,-0.05368042,0.023422241,-0.04852295,0.002111435,0.0026607513,-0.020751953,0.0046958923,-0.01008606,-0.025863647,-0.037872314,0.014839172,-0.000050127506,0.0024986267,0.020614624,-0.027862549,-0.028808594,-0.07098389,-0.018234253,-0.0056610107,0.08068848,0.0063705444,-0.014457703,-0.04425049,-0.0075683594,0.027069092,-0.0051460266,0.033935547,-0.015853882,-0.013534546,-0.007575989,-0.042755127,-0.0067634583,-0.024246216,0.03137207,0.0030403137,-0.010345459,0.020568848,0.0015077591,0.018112183,0.005268097,0.0030078888,0.01020813,-0.032836914,0.00060653687,-0.0151901245,0.032318115,0.0124435425,-0.0033740997,-0.026550293,0.051361084,-0.0022506714,0.026931763,-0.02911377,0.002483368,-0.0032634735,0.011360168,0.030822754,-0.022583008,-0.009796143,-0.020126343,-0.050109863,-0.068481445,0.03744507,-0.010795593,0.02230835,0.020385742,0.02178955,0.02041626,-0.021026611,0.019805908,0.013580322,-0.027633667,-0.006717682,-0.018966675,-0.034332275,-0.020126343,-0.0051002502,-0.019927979,0.022949219,-0.015556335,0.020217896,-0.0066986084,-0.039245605,0.033325195,0.0039978027,-0.003458023,0.019226074,0.01499939,0.024765015,0.044708252,0.018203735,-0.043823242,0.021896362,-0.0045928955,0.01576233,-0.01576233,0.044128418,0.022140503,-0.01725769,0.0062217712,-0.0029449463,-0.017318726,-0.015136719,0.009757996,0.012535095,0.027893066,0.00356102,-0.04928589,0.010360718,0.00019133091,-0.012565613,-0.024108887,0.010765076,0.014633179,-0.04525757,0.01348114,0.02835083,0.049072266,-0.009010315,0.02192688,0.00040626526,0.043029785,0.0501709,-0.008300781,-0.016799927,0.02368164,-0.005115509,0.0058670044,-0.005958557,-0.0077056885,0.009773254,-0.0033435822,0.009216309,0.037353516,0.015823364,-0.033691406,-0.028274536,0.01197052,-0.02835083,-0.019042969,0.026489258,0.018692017,0.02267456,-0.028274536,0.016189575,0.0103302,-0.022949219,-0.021408081,-0.0146102905,0.038238525,-0.019958496,-0.008132935,0.009208679,0.015823364,0.028320312,-0.050476074,-0.0055351257,0.008377075,0.007068634,-0.023880005,-0.04852295,-0.04397583,-0.012672424,0.03717041,0.00274086,0.02305603,0.032836914,-0.007282257,0.0107803345,0.02204895,0.0069007874,-0.015541077,-0.01197052,-0.053741455,-0.020980835,0.00894165,0.006919861,-0.031677246,0.026107788,-0.011749268,-0.024978638,0.0027618408,-0.01007843,-0.019561768,-0.009628296,0.0068511963,0.039642334,0.0037441254,0.02027893,-0.014564514,-0.040527344,-0.007972717,0.008506775,0.029846191,-0.045715332,0.015808105,-0.00756073,-0.01436615,-0.0046157837,0.011413574,0.012374878,0.02772522,0.015014648,0.04324341,-0.03768921,0.04714966,-0.030944824,0.01826477,-0.0025482178,-0.032348633,-0.012748718,-0.039245605,-0.0002539158,0.040985107,-0.0209198,-0.012054443,-0.016067505,-0.042510986,-0.014839172,-0.05609131,0.02230835,0.024642944,0.04727173,-0.02645874,0.010765076,0.007858276,0.010803223,-0.015792847,-0.006160736,-0.0062217712,0.012626648,0.01852417,0.014472961,-0.011260986,-0.028778076,-0.029403687,0.0082092285,-0.05697632,-0.044433594,-0.008911133,0.010871887,-0.0026435852,-0.01776123,-0.023269653,-0.04724121,0.008705139,-0.038024902,0.019683838,-0.008079529,0.016494751,0.010681152,-0.02482605,0.012184143,0.011833191,-0.011619568,0.023864746,-0.003610611,-0.022109985,-0.020568848,0.005115509,0.018234253,0.0029907227,0.007858276,-0.019256592,0.000110030174,-0.029785156,-0.04888916,-0.00030088425,-0.010795593,-0.009880066,-0.015487671,0.015029907,-0.061584473,-0.007865906,-0.031982422,-0.0041770935,0.017425537,0.032073975,-0.010940552,-0.015220642,-0.00022828579,-0.011009216,-0.010223389,-0.038848877,0.012535095,0.011764526,0.01499176,0.027053833,0.04824829,-0.01084137,-0.023605347,0.0127334595,0.017532349,0.016723633,-0.012283325,0.00044298172,-0.023284912,0.020019531,-0.011222839,-0.001288414,-0.040283203,0.017852783,0.076660156,0.00008678436,-0.006542206,-0.018249512,-0.020767212,0.015686035,0.03491211,-0.040283203,0.003774643,-0.01878357,0.012840271,-0.011886597,0.020233154,0.0032215118,0.012992859,-0.022979736,-0.04812622,-0.00071430206,-0.0011234283,-0.024383545,-0.0637207,-0.018676758,-0.06964111,0.009460449,-0.009277344,-0.03741455,-0.0006227493,0.01914978,-0.01727295,-0.086242676,0.0088272095,0.049865723,-0.00749588,0.021881104,0.00039243698,0.029708862,0.021942139,-0.025253296,-0.0030651093,0.02746582,-0.038360596,-0.030441284,-0.027450562,0.033599854,-0.00033521652,-0.015296936,0.010429382,0.008201599,0.0231781,-0.008026123,0.0011663437,-0.01939392,0.016174316,-0.005622864,0.007965088,-0.015411377,-0.016540527,0.04272461,-0.059509277,0.013175964,-0.00434494,-0.01171875,-0.0015630722,0.047332764,0.030136108,-0.040130615,-0.027175903,0.010635376,0.0041046143,0.020141602,-0.018478394,0.048858643,0.011192322,-0.020858765,0.00023400784,0.00008493662,-0.012168884,-0.03741455,-0.032592773,0.018600464,0.007411957,0.018463135,-0.019760132,-0.0025043488,0.022583008,0.0005130768,-0.0011844635,-0.02406311,-0.022720337,-0.017501831,0.0043945312,-0.0028152466,0.012710571,-0.0047073364,0.023361206,0.023971558,0.0340271,-0.0041542053,-0.00894165,0.0033226013,0.028030396,-0.015151978,0.00078725815,0.017684937,0.009208679,0.020721436,0.014137268,0.012031555,-0.046783447,-0.0074539185,-0.015823364,-0.01940918,-0.0048828125,-0.014053345,-0.003129959,0.011894226,-0.008796692,-0.025390625,-0.017990112,0.013114929,-0.04977417,-0.023468018,-0.0060768127,-0.0020179749,0.02268982,0.0023040771,-0.0012235641,0.010551453,-0.00497818,0.051574707,0.0036697388,-0.020248413,0.020431519,0.041107178,0.0051498413,-0.022155762,-0.0076904297,0.003036499,-0.0025157928,0.004673004,-0.039031982,0.024871826,0.039916992,-0.011253357,0.026031494,0.0022277832,0.03692627,-0.00667572,0.013130188,-0.011306763,0.014472961,-0.015098572,0.04269409,-0.04840088,0.010284424,0.007522583,0.007797241,-0.008529663,-0.017181396,-0.030441284,0.023162842,0.0077438354,-0.019424438,0.05328369,-0.005947113,0.03488159,-0.015609741,-0.021392822,-0.004070282,-0.019622803,-0.021453857,0.02116394,-0.010238647,0.0058784485,0.017333984,-0.020645142,0.018157959,-0.027618408,0.010726929,-0.0026111603,-0.00074243546,-0.003490448,-0.0066833496,-0.0020198822,0.010299683,-0.022354126,-0.009811401,-0.002166748,0.05178833,0.025497437,0.02558899,0.03656006,0.01285553,0.001499176,-0.03567505,-0.029922485,-0.0077934265,-0.026687622,0.014266968,-0.010192871,0.04550171,0.041656494,0.013793945,0.043121338,0.033325195,0.03366089,-0.012634277,0.02722168,-0.026992798,0.0028800964,-0.024108887,0.023742676,-0.0062561035,0.039611816,-0.0287323,0.00969696,0.02998352,0.013870239,-0.013343811,0.025009155,0.068115234,0.020339966,0.0055732727,0.025802612,-0.000770092,-0.0020008087,-0.0025939941,-0.02960205,0.05126953,0.02029419,0.054138184,0.023010254,0.0075149536,-0.0070877075,0.030273438,-0.032440186,-0.021102905,0.046813965,0.014892578,-0.016647339,-0.015052795,-0.009712219,0.009361267,-0.046173096,-0.018859863,0.020080566,0.01033783,0.0017137527,-0.012512207,-0.013580322,-0.013595581,-0.005382538,0.009605408,0.009780884,-0.017181396,0.020812988,0.02619934,0.015640259,0.025817871,-0.006160736,0.03741455,-0.03010559,-0.014877319,0.007610321,0.019973755,-0.016159058,-0.005580902,0.023712158,-0.0049743652,0.036346436,0.03265381,-0.01524353,-0.0067214966,0.024551392,0.010696411,0.0041046143,0.054138184,0.033294678,0.008171082,0.033477783,0.03152466,0.030899048,-0.036132812,0.026794434,-0.005748749,0.017318726,-0.019515991,-0.019989014,0.00077295303,-0.013061523,0.006576538,-0.010848999,-0.013702393,0.012496948,0.039855957,-0.010505676,-0.01071167,-0.013412476,0.00035715103,-0.019805908,-0.02204895,0.0234375,-0.020401001,0.019515991,0.01398468,0.03137207,-0.024887085,0.021606445,-0.012046814,-0.025619507,0.00983429,0.027740479,-0.03665161,0.0023384094,-0.012901306,0.004283905,-0.041503906,-0.0025672913,0.032043457,-0.015914917,0.015464783,0.01550293,-0.0013561249,-0.009635925,0.02848816,0.012496948,-0.007843018,-0.008132935,-0.029129028,0.027893066,0.04067993,-0.0032672882,0.008071899,-0.012626648,0.009284973,-0.0025348663,-0.01171875,0.007972717,0.009498596,-0.01928711,-0.009803772,0.0040664673,0.03475952,0.019592285,0.046875,-0.016677856,-0.017837524,0.008781433,0.036254883,0.0019779205,-0.009788513,0.002998352,0.030166626,-0.019500732,0.02609253,0.039489746,0.012619019,0.017837524,-0.0007119179,-0.0029888153,0.016418457,-0.024414062,0.02204895,-0.025756836,-0.0128479,-0.005203247,0.03552246,-0.009124756,-0.045532227,0.009597778,-0.011077881,-0.020645142,-0.017715454,0.008018494,-0.0023651123,0.025527954,0.03668213,0.026672363,-0.037231445,0.061309814,-0.017562866,0.040649414,-0.0041923523,-0.01486969,0.04324341,0.031951904,0.041046143,0.011779785,0.015960693,-0.029083252,0.0060653687,0.037078857,0.03564453,0.011047363,0.0020523071,-0.012145996,0.03353882,0.00085544586,0.03475952,-0.010772705,0.013191223,0.011459351,-0.0067100525,-0.0042152405,-0.0031490326,-0.012466431,0.0032405853,0.05822754,-0.015052795,-0.0024852753,-0.020614624,-0.008682251,0.03062439,-0.010192871,0.0024528503,-0.0048103333,-0.028869629,0.010719299,-0.013252258,-0.018814087,0.018737793,0.021636963,-0.042266846,-0.01576233,0.014877319,0.012290955,-0.021865845,0.03475952,0.025878906,-0.003993988,0.016708374,0.038757324,-0.0041999817,0.022598267,-0.009025574,0.024291992,0.03881836,0.0025672913,-0.012145996,0.0049324036,0.017852783,-0.011924744,0.006866455,0.035858154,0.0010213852,-0.0051193237,0.0007286072,0.00043582916,-0.0055274963,-0.0062942505,-0.006072998,0.0006747246,-0.010719299,0.006980896,0.008590698,0.013549805,0.00856781,0.020935059,-0.008384705,-0.019729614,0.008018494,0.044708252,0.028671265,-0.027893066,-0.00024354458,-0.0017414093,0.007751465,-0.021652222,-0.01763916,-0.0051002502,-0.032287598,0.01209259,0.02671814,0.005760193,0.01008606,-0.027557373,-0.0024280548,0.029159546,0.0039138794,0.0058059692,-0.0049057007,-0.01247406,0.011405945,-0.012374878,-0.0063934326,-0.007873535,-0.009117126,0.00012135506,0.018661499,0.0024490356,-0.028045654,0.017990112,0.0030708313,0.0020542145,-0.007133484,-0.0005660057,0.02494812,0.0043525696,0.00299263,-0.013763428,0.013557434,-0.012794495,-0.0049705505,-0.007904053,0.040222168,0.046783447,-0.013725281,-0.02017212,0.021316528,0.026550293,0.02810669,0.039855957,0.010253906,0.04458618,0.019454956,-0.01713562,-0.021469116,0.016693115,-0.0105896,-0.037231445,0.013809204,-0.016937256,-0.014633179,0.01499939,0.008361816,-0.0034866333,-0.028701782,-0.019195557,-0.006252289,-0.018829346,0.014404297,-0.0015602112,0.020004272,-0.010749817,0.0061683655,0.012207031,-0.023590088,-0.05038452,-0.012840271,0.0016736984,-0.010559082,-0.06573486,0.004432678,-0.026382446,0.018585205,-0.015930176,0.0030555725,-0.017181396,0.021011353,-0.021621704,-0.00869751,-0.0030727386,0.022781372,0.012359619,0.007217407,0.009216309,-0.013298035,-0.007499695,-0.025680542,-0.0030498505,-0.029190063,0.013618469,0.0046310425,0.04574585,0.006336212,-0.01335144,0.0049705505,-0.022079468,-0.006919861,-0.0056114197,-0.032684326,-0.03111267,0.03503418,0.019165039,0.01448822,0.0017518997,0.031036377,-0.024627686,-0.0076560974,0.013534546,0.03491211,0.0095825195,0.02482605,-0.017364502,0.0034561157,-0.03289795,-0.013877869,-0.015899658,0.00071287155,0.0019426346,0.0054473877,-0.011405945,0.023925781,0.024490356,-0.012809753,-0.0018749237,0.031463623,0.020751953,-0.010055542,0.04623413,0.027191162,0.0074653625,-0.0096206665,-0.007160187,0.01499939,0.05697632,0.008140564,0.021118164,0.0074882507,0.005970001,-0.0209198,0.007183075,0.0066108704,-0.021820068,-0.036376953,-0.010635376,-0.024398804,0.03314209,0.000001013279,0.012176514,-0.0061149597,0.01424408,-0.011985779,-0.034973145,-0.014160156,0.024902344,0.008026123,-0.019302368,0.0035305023,0.010475159,0.014770508,-0.02949524,0.0030059814,-0.042144775,-0.04248047,-0.02545166,-0.01802063,0.036712646,0.013259888,-0.006629944,0.0024471283,0.0025043488,-0.0020713806,-0.005191803,0.017745972,-0.006629944,-0.005432129,0.014083862,0.012809753,-0.018875122,0.017532349,-0.011985779,-0.0046157837,0.005756378,-0.006641388,0.025634766,-0.0119018555,0.04257202,0.0003914833,-0.0074043274,0.0390625,0.011650085,0.025390625,-0.026824951,0.0050315857,0.0065231323,-0.009513855,0.043060303,-0.012008667,-0.019500732,0.013839722,-0.018981934,-0.018951416,0.011634827,0.013969421,0.02053833,-0.0001450777,0.035827637,-0.02911377,-0.012924194,-0.0067367554,0.017608643,-0.015312195,0.007358551,0.028762817,0.010505676,0.0030727386,-0.00422287,-0.009185791,-0.029129028,-0.011779785,0.008857727,-0.002811432,-0.017669678,0.016952515,0.012626648,0.04827881,-0.004131317,0.0038108826,0.019500732,0.0011920929,0.037719727,0.010871887,0.035614014,-0.0013360977,-0.02859497,-0.0057373047,-0.005104065,-0.028030396,0.008987427,0.0017499924,0.003156662,-0.04397583,0.015365601,-0.0066452026,0.027801514,-0.014633179,0.016677856,-0.012550354,-0.0046157837,-0.030761719,-0.0044174194,-0.044830322,0.015350342,0.027801514,-0.004600525,0.0211792,0.00995636,-0.017120361,0.036865234,0.052246094,0.009719849,-0.03768921,-0.018539429,0.0069122314,-0.00374794,0.011383057,0.0026988983,-0.020706177,-0.026229858,-0.0037841797,-0.01576233,-0.007858276,-0.013397217,0.027740479,0.011116028,-0.0029010773,-0.004776001,0.025344849,-0.015327454,0.00472641,0.015701294,-0.0003695488,0.032989502,0.02017212,-0.01689148,0.025817871,0.011177063,-0.04977417,0.05343628,-0.0037612915,0.029708862,-0.016616821,0.008300781,-0.041931152,-0.030731201,-0.003112793,-0.0044822693],"createdAt":"2026-04-18T18:32:20.727Z","updatedAt":"2026-04-23T23:01:55.259Z","lastSeenAt":"2026-04-23T23:01:55.259Z","tsv":"'/api':181 '/api/v1/invoices/25':111,218 '/docs':179 '/pricing':180 '/readme':183 '0.02':93,134 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':167 '20':127 '300':170 '402':122 '402 payment api' 'accept':159 'access':117 'across':52 'address':162 'ai':12,28,62 'analysi':66 'analyt':56 'analytics' 'api':5,21,39,116,147 'appear':227 'avail':209 'base':8,24,101,129,136 'base usdc api' 'behavior':246 'behind':216 'broad':44 'catalog':45,231 'categori':54 'challeng':123 'classif':69 'commit':155 'connect':189 'contact':238 'content':195 'contract':166 'convers':86 'cover':10,26 'crawl':212 'crypto api gateway' 'data':11,27,55,59 'data-export' 'describ':113 'detail':242 'document':174,204 'embed':70 'embeddings' 'enabl':38 'endpoint':16,32,51,89,109,219,245 'estim':80 'exact':143,214 'exampl':208 'exchang':75 'exchange-rates' 'expect':234 'experi':236 'export':60 'extrem':176 'feed':74 'financ':13,29,71 'four':53 'function':215 'gas':79 'gas-estimates' 'generat':87 'geocod':84 'geocoding' 'homepag':230 'i.e':133 'individu':244 'infrastructur':82 'insight':61 'key':148 'learn':64 'limit':151 'live':121 'low payment fee' 'lowpaymentfee.com':33 'machin':63 'made':139 'metric':57 'micropayment api' 'network':102 'offer':42 'openapi':199 'page':184 'paid':96 'pay':2,18,48 'pay per call api' 'pay-per-request':1,17,47 'payment':137,160,172 'per':3,19,49,94 'platform':6,22,40,158 'premium':115 'price':73,91 'price-feeds' 'probe':110 'prompt':191 'protocol':106 'provid':240 'quot':78 'rate':76,150 'render':186 'report':58 'request':4,20,50,95,124 'request/response':202 'requir':156 'return':119 'schema':203 'scheme':144 'second':171 'sentiment':65 'sentiment-analysis' 'spars':177 'spec':200 'specif':108,220 'subscript':154 'summar':68 'text':67 'text-classification' 'text-summarization' 'timeout':173 'token':77 'unclear':222 'unit':130 'usag':207 'usdc':9,25,98,132,165 'usdc-base' 'use':164 'user':232 'util':15,31,83 'valid':85 'via':103,140 'wallet':190 'web3':72 'x402':37,105,142 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"44ec3ed0-163a-407f-9e34-fe6fd5df8009","listingId":"68e514d4-4d49-404b-9787-0176fbf64039","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/invoices/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:20.727Z"}],"sources":[{"listingId":"68e514d4-4d49-404b-9787-0176fbf64039","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:20.727Z","lastSeenAt":"2026-04-23T23:01:55.259Z"}],"details":{"listingId":"68e514d4-4d49-404b-9787-0176fbf64039","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/25 \\\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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all 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":"x402 challenge returns maxAmountRequired of 20000 base units USDC ($0.02) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/invoices/25"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/25"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a utility service paid per call","Exporting analytics data or generating reports with no subscription overhead"],"bestFor":["AI agents that need keyless, pay-per-use API access","Developers prototyping with low-cost micropayment endpoints on Base","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on the Base network or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.929Z"},"updatedAt":"2026-04-23T23:01:55.259Z"}}