{"id":"97ed0160-76cf-4bd6-82bf-840f6124a6a7","shortId":"HCnqt7","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/charges/278` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain to the specified wallet address with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific endpoint `/api/v1/charges/278` is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages on the site returned only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI schema, example responses, or detailed documentation, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","on-chain API payment"],"warnings":["No documentation available — docs, pricing, and API pages return only a 'Connect wallet' prompt","The specific functionality of /api/v1/charges/278 ('Premium API Access') is not described anywhere","No OpenAPI schema or example responses provided","No information on what request body this POST endpoint expects"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/278","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/278","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 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no example request/response, and no documentation beyond a generic label. The docs/pricing/API pages all returned only 'Connect wallet' with no useful content. The actual functionality behind this specific charge ID is unknown.","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":"2026-04-19T03:37:25.670Z","embedding":[-0.023086548,-0.03604126,0.04144287,0.029205322,0.019378662,-0.027252197,-0.033050537,0.028060913,0.07763672,-0.07098389,0.028884888,-0.03479004,-0.033203125,-0.03439331,-0.034057617,-0.0043258667,-0.021469116,0.004016876,-0.04055786,0.02999878,0.026870728,-0.028015137,-0.02041626,0.031921387,0.005634308,-0.03289795,-0.010940552,-0.01663208,-0.014007568,-0.02998352,0.029220581,-0.027389526,-0.0107421875,0.0095825195,-0.020629883,-0.019943237,-0.010139465,0.029586792,0.035949707,-0.008514404,-0.010948181,-0.05255127,-0.0039634705,-0.004055023,-0.04824829,-0.001285553,-0.006996155,-0.018295288,-0.0039596558,0.0066337585,-0.028625488,-0.01876831,-0.0059432983,0.005672455,0.019546509,0.016967773,0.0064582825,-0.0072288513,0.008155823,0.012573242,-0.0067749023,-0.07299805,-0.010818481,-0.006008148,-0.009971619,0.05545044,-0.010566711,0.04446411,0.0050239563,0.050933838,0.046173096,0.051849365,0.031433105,0.023864746,0.0034751892,0.0044898987,0.0069389343,0.06439209,-0.020828247,-0.0076446533,-0.015106201,-0.0010251999,-0.052703857,0.0074310303,-0.010604858,-0.027389526,-0.013313293,0.014144897,-0.016098022,0.019943237,-0.07342529,0.0016155243,-0.007904053,0.0013771057,0.018600464,0.0018815994,-0.0029144287,0.03050232,-0.017410278,0.017944336,0.010643005,-0.041107178,0.007820129,0.013015747,0.036621094,0.03945923,0.024398804,0.035491943,0.0074501038,-0.013702393,-0.009231567,0.02532959,-0.027328491,-0.018432617,0.01473999,0.0101623535,-0.022125244,0.02142334,-0.02947998,0.019897461,-0.04144287,0.041748047,0.02381897,-0.015182495,0.023086548,-0.04248047,-0.01600647,0.020339966,-0.028182983,-0.012023926,0.025848389,0.00932312,0.029769897,-0.02130127,-0.026809692,-0.0022335052,-0.016479492,-0.026916504,-0.05343628,-0.039276123,0.05178833,-0.034729004,0.021881104,0.030319214,-0.107177734,-0.002368927,-0.04562378,0.0010108948,-0.040618896,-0.012138367,-0.018341064,0.027130127,-0.016357422,-0.01210022,-0.015670776,-0.01373291,0.01071167,0.025558472,-0.029129028,0.05404663,-0.014350891,0.038391113,0.010955811,0.006603241,0.028289795,0.025939941,-0.008506775,-0.07067871,-0.08862305,-0.021957397,-0.013679504,-0.020980835,-0.041046143,-0.008605957,-0.0016269684,-0.0713501,-0.021514893,-0.013313293,-0.005748749,-0.029846191,-0.007926941,-0.02230835,0.016616821,-0.005470276,-0.07287598,-0.019729614,-0.021026611,0.07513428,0.024246216,0.016357422,0.028396606,-0.024383545,0.06567383,0.024856567,-0.025039673,-0.026321411,0.026870728,-0.008773804,0.02041626,-0.009300232,0.0061416626,-0.0463562,0.040130615,0.062408447,0.019058228,-0.016403198,0.00088739395,-0.048431396,-0.024307251,-0.041534424,0.002735138,0.006839752,0.000831604,0.04748535,-0.040893555,-0.041503906,-0.008460999,0.014053345,0.005996704,0.04525757,0.023162842,-0.009918213,0.006385803,0.016555786,-0.036590576,0.027435303,0.02507019,0.0047569275,-0.018859863,-0.022094727,0.025039673,0.029693604,-0.019012451,0.009300232,-0.012161255,0.019470215,0.002840042,0.021240234,0.03036499,-0.018615723,-0.023269653,-0.022155762,-0.014122009,0.02835083,0.0012264252,-0.031585693,-0.036071777,-0.078552246,0.04989624,0.027435303,0.041870117,0.0012111664,0.011413574,-0.019210815,-0.007896423,-0.07476807,0.059143066,0.07763672,-0.0048103333,-0.013366699,0.007843018,-0.011604309,-0.022857666,-0.01084137,-0.0009589195,-0.037597656,-0.029205322,0.014312744,-0.053955078,0.0072631836,0.011428833,0.022415161,0.06951904,-0.0074424744,-0.04711914,-0.023895264,-0.00381279,-0.0043411255,-0.014640808,-0.0044555664,-0.021774292,0.006439209,0.016845703,-0.0041160583,0.026794434,-0.0023708344,0.008354187,-0.0067825317,-0.008705139,-0.019363403,-0.026916504,0.0045661926,-0.024139404,-0.05947876,0.0011138916,0.004638672,0.06549072,-0.044006348,0.03543091,-0.005443573,-0.0027694702,0.057617188,-0.010345459,-0.05154419,0.014755249,0.02619934,0.026367188,0.047332764,0.001613617,-0.046325684,-0.014923096,0.07141113,-0.009941101,-0.017120361,0.008338928,0.014312744,0.019744873,0.00096702576,-0.06933594,-0.031341553,-0.014137268,-0.039733887,0.018981934,-0.03717041,0.021942139,-0.011116028,0.0066719055,-0.013366699,-0.005317688,-0.026794434,0.026153564,-0.018753052,0.013008118,-0.024749756,-0.01373291,0.028442383,0.004917145,-0.0078125,0.005340576,0.044525146,0.036010742,-0.003698349,-0.035308838,-0.008354187,-0.007209778,0.0047950745,0.024414062,0.02507019,0.021759033,0.05142212,-0.03540039,0.02772522,0.037261963,0.0143966675,0.031799316,-0.007144928,0.0141067505,-0.06286621,-0.04586792,-0.028808594,-0.037902832,0.037109375,0.01965332,-0.004436493,0.039154053,0.0021038055,-0.02772522,-0.037109375,0.020767212,-0.04800415,0.004463196,0.04019165,-0.0048179626,-0.03060913,-0.011665344,0.0025119781,0.000910759,0.033935547,0.012794495,0.0070877075,0.06021118,0.038085938,0.0029315948,0.02180481,0.013397217,0.031707764,-0.0014829636,-0.038360596,-0.02432251,-0.0027503967,0.019729614,-0.008239746,-0.0149383545,-0.068603516,0.04650879,0.04711914,0.08441162,0.027572632,-0.000025868416,0.024627686,0.0008149147,0.008598328,-0.0335083,-0.008323669,-0.026367188,-0.04876709,0.03060913,-0.01776123,-0.0056037903,-0.018722534,0.04385376,-0.0008969307,0.01676941,-0.026321411,0.0579834,0.002325058,-0.015510559,0.022354126,0.013694763,0.0335083,0.068115234,-0.04321289,0.036499023,0.032226562,-0.03881836,0.00869751,0.052856445,-0.017181396,-0.011672974,-0.059661865,-0.01852417,0.0071258545,-0.016448975,-0.052978516,0.0025634766,0.018234253,0.014640808,0.022750854,-0.012130737,-0.03173828,-0.0051345825,-0.012321472,-0.054779053,-0.011802673,-0.033233643,0.0010385513,0.04257202,-0.0259552,-0.0022125244,0.0071105957,-0.012718201,0.0024032593,0.0068855286,0.024841309,-0.010147095,-0.048980713,0.030258179,0.009025574,0.0062294006,0.008079529,0.03918457,0.016082764,0.03253174,0.048095703,0.011734009,-0.022064209,-0.05996704,0.03149414,-0.04385376,0.0020561218,0.026153564,-0.021499634,-0.011711121,-0.012863159,-0.021118164,-0.02079773,0.007774353,-0.029907227,0.004459381,0.0154800415,-0.024612427,-0.030181885,-0.054473877,-0.010101318,-0.0026340485,0.058624268,0.028182983,0.009132385,-0.0713501,-0.010658264,0.026977539,0.010673523,0.026763916,-0.014350891,-0.016479492,-0.009170532,-0.042999268,-0.004306793,-0.013511658,0.009628296,-0.007865906,-0.018585205,0.038024902,-0.0028324127,0.025146484,-0.0030708313,0.020324707,0.037750244,-0.039123535,-0.0045700073,-0.018234253,0.031829834,-0.0031108856,-0.015991211,-0.047332764,0.036010742,0.01876831,0.026657104,-0.027130127,-0.004016876,-0.0013599396,0.017059326,0.023757935,-0.008613586,-0.012893677,-0.0051231384,-0.0491333,-0.04159546,0.036621094,-0.030914307,0.030807495,0.012763977,0.0076446533,0.018325806,-0.006549835,0.004386902,0.023757935,-0.022918701,-0.009483337,-0.019927979,-0.03427124,-0.012321472,-0.00037002563,-0.011955261,0.017913818,-0.020706177,0.02407837,0.00075149536,-0.017318726,0.027435303,-0.0012426376,-0.0012960434,0.024215698,-0.0049476624,0.02619934,0.03982544,0.015258789,-0.041503906,0.022918701,-0.0029830933,0.013748169,-0.020767212,0.037384033,0.031204224,-0.0060768127,-0.0021476746,-0.0112838745,-0.013664246,-0.020202637,-0.0046310425,0.013916016,0.030319214,-0.0018005371,-0.03894043,0.029586792,0.014183044,-0.03515625,-0.013252258,0.018417358,0.0107421875,-0.03237915,0.03640747,0.03982544,0.05895996,-0.01876831,0.0021266937,0.015106201,0.026184082,0.033355713,0.020904541,-0.013015747,0.018218994,-0.011520386,0.016784668,-0.015602112,0.0032730103,0.01399231,-0.00095796585,0.027664185,0.02720642,0.0095825195,-0.014915466,-0.03591919,0.015052795,-0.0076179504,-0.015388489,0.013069153,0.02407837,0.013404846,-0.020111084,0.023162842,0.013938904,-0.03149414,-0.022155762,0.008872986,0.036315918,-0.032043457,-0.021606445,0.018493652,0.009277344,0.043426514,-0.0619812,0.0031585693,0.007911682,0.022994995,-0.027252197,-0.035705566,-0.041870117,0.02305603,0.027770996,0.007434845,0.020065308,0.032714844,0.0022697449,0.0062675476,0.02230835,0.006526947,-0.018417358,-0.009597778,-0.043762207,-0.009506226,-0.010910034,-0.0087509155,-0.038330078,0.008239746,-0.013938904,-0.0440979,0.010253906,-0.013664246,0.00020563602,0.008613586,0.014976501,0.034088135,-0.0032424927,0.008102417,-0.019546509,-0.033569336,0.0061035156,-0.010643005,0.023422241,-0.052734375,0.0073394775,-0.015472412,-0.001991272,0.0041542053,0.007522583,0.0287323,0.027908325,0.0052337646,0.030136108,-0.045440674,0.047454834,-0.03970337,0.021591187,0.010276794,-0.045166016,-0.0037899017,-0.020599365,-0.015258789,0.04647827,-0.019989014,-0.011421204,-0.023345947,-0.025543213,-0.0093688965,-0.048614502,0.012916565,0.032714844,0.03237915,-0.024124146,0.00017404556,-0.004585266,-0.005016327,-0.01259613,0.0070877075,-0.020324707,0.020690918,0.008552551,0.012313843,-0.015777588,-0.022750854,-0.028274536,-0.003929138,-0.04763794,-0.049072266,-0.018188477,0.0088272095,-0.012336731,-0.014015198,-0.019439697,-0.014755249,0.005428314,-0.048614502,0.0134887695,0.013366699,0.02571106,-0.005039215,-0.017105103,0.006591797,0.019470215,-0.010681152,0.042144775,0.015571594,-0.011756897,-0.02381897,0.002840042,0.028686523,0.026977539,0.004627228,-0.006313324,-0.018600464,-0.021713257,-0.05441284,-0.011505127,-0.0065841675,-0.012954712,0.00023162365,0.010009766,-0.042877197,-0.0058135986,-0.018035889,0.005214691,0.024520874,0.0049362183,0.018341064,-0.008766174,0.006931305,-0.0009570122,-0.008857727,-0.031829834,0.02784729,0.010253906,-0.000323534,0.016708374,0.039001465,0.0038146973,-0.011947632,-0.002620697,0.0023670197,0.009025574,-0.022827148,0.0042877197,-0.012992859,0.005191803,-0.016601562,-0.010368347,-0.038482666,-0.00868988,0.09100342,-0.0060691833,-0.013442993,-0.001414299,-0.01965332,0.01586914,0.015144348,-0.042144775,-0.010505676,-0.040252686,0.01210022,-0.028945923,0.030258179,0.0069885254,0.015289307,-0.026657104,-0.06274414,-0.016189575,0.016616821,-0.015274048,-0.063964844,-0.012077332,-0.056030273,-0.00088977814,-0.0034046173,-0.023880005,0.0061149597,0.018951416,-0.011390686,-0.08337402,0.015716553,0.037475586,0.013954163,0.025909424,-0.0154418945,0.022384644,0.023117065,-0.03201294,-0.003604889,0.037384033,-0.020462036,-0.010597229,-0.020553589,0.01184845,-0.014549255,-0.029022217,0.0284729,0.010025024,0.021530151,-0.0068511963,0.009597778,-0.017959595,0.013366699,-0.010406494,0.024475098,-0.010429382,-0.0015354156,0.03186035,-0.042541504,0.028503418,0.029312134,0.0013656616,-0.0013980865,0.022216797,0.037384033,-0.039276123,-0.009422302,0.02381897,0.0010976791,0.041503906,-0.03390503,0.038604736,0.029388428,-0.015159607,0.025314331,-0.0031986237,-0.021697998,-0.03387451,-0.02279663,0.03010559,0.003479004,0.021011353,-0.021255493,0.013290405,0.011314392,-0.021621704,0.018005371,-0.0057258606,-0.019088745,-0.011314392,0.005859375,-0.010375977,-0.00046730042,-0.0090408325,0.023468018,0.012298584,0.04348755,0.008171082,-0.0016937256,-0.0020370483,0.0234375,-0.013420105,0.0038776398,0.018371582,0.004776001,0.027648926,0.014511108,0.008621216,-0.03579712,-0.0134887695,-0.02746582,-0.0022277832,0.0042495728,-0.00819397,-0.016616821,-0.0050697327,0.0016050339,-0.01020813,-0.032073975,0.0060653687,-0.023025513,-0.025146484,-0.009643555,-0.017684937,0.01007843,0.0028381348,0.005405426,0.023452759,0.0030574799,0.05657959,0.0054626465,-0.004421234,0.013420105,0.03692627,0.008842468,-0.035705566,-0.011672974,-0.015602112,0.00029921532,0.0037994385,-0.021972656,0.010627747,0.039642334,-0.012779236,0.011070251,0.0044136047,0.022567749,-0.007255554,0.009185791,-0.01713562,0.021057129,-0.010292053,0.029922485,-0.04437256,0.026321411,0.018936157,-0.0013933182,-0.004737854,-0.016723633,-0.034057617,0.010894775,0.0058250427,-0.011436462,0.05480957,0.0031337738,0.021270752,-0.024810791,-0.012802124,0.024276733,-0.033233643,-0.01574707,0.042510986,0.005470276,0.001033783,0.0109939575,-0.030517578,0.03149414,-0.02758789,0.023544312,-0.013618469,0.006916046,-0.0077934265,-0.017822266,-0.023834229,-0.014755249,-0.01637268,0.0072402954,0.009269714,0.044189453,0.010253906,0.042022705,0.056884766,0.017166138,0.006385803,-0.03479004,-0.026412964,0.00013124943,-0.030471802,0.018081665,-0.0062332153,0.04321289,0.045318604,-0.0056915283,0.035736084,0.037506104,0.029434204,0.006298065,0.009780884,-0.019714355,0.0069770813,0.0015516281,0.030319214,0.009185791,0.03652954,-0.013473511,0.014640808,0.008705139,0.040222168,-0.041870117,0.021209717,0.07507324,0.014183044,-0.017684937,0.039794922,0.0019044876,-0.01902771,-0.0124435425,-0.014823914,0.066711426,0.00793457,0.060577393,0.059326172,0.021774292,-0.0028858185,0.018478394,-0.03994751,-0.023086548,0.07519531,0.02746582,-0.017868042,-0.02619934,-0.015838623,0.000043690205,-0.046936035,-0.036865234,0.012023926,-0.0149002075,0.01133728,-0.013053894,-0.008651733,-0.012962341,0.01626587,0.02558899,0.018692017,-0.020492554,0.01322937,0.031982422,0.008850098,0.016174316,-0.016693115,0.024765015,-0.022354126,-0.02104187,0.00894928,0.014831543,-0.012664795,-0.011360168,0.025421143,0.0039749146,0.049591064,0.039489746,-0.013198853,0.012619019,0.031707764,0.015419006,-0.015220642,0.0446167,0.04977417,0.01914978,0.039978027,0.03427124,0.033355713,-0.028701782,0.032073975,-0.00030064583,0.0065612793,0.002298355,-0.0036201477,0.008102417,-0.017333984,0.018859863,0.0041923523,-0.020385742,0.019119263,0.03289795,-0.0037899017,-0.0030727386,-0.018722534,-0.00080013275,-0.016036987,0.0017166138,0.008361816,-0.019729614,0.027832031,0.01058197,0.026763916,-0.030838013,0.014266968,-0.00995636,-0.023910522,-0.007835388,0.014717102,-0.035095215,0.0029735565,-0.0041503906,0.0048828125,-0.03970337,0.014472961,0.018585205,-0.01651001,0.03289795,0.0067367554,0.003578186,0.0071983337,0.013442993,0.0027446747,-0.004711151,-0.014198303,-0.018081665,0.042266846,0.04385376,0.001709938,0.018341064,-0.024261475,-0.012001038,0.0055274963,-0.004928589,-0.0095825195,-0.008575439,-0.01737976,-0.027770996,0.0076446533,0.034576416,0.028915405,0.0418396,-0.0104599,-0.0256958,0.00869751,0.024368286,0.004020691,-0.0048675537,-0.0047073364,0.012817383,-0.0053215027,0.04208374,0.027801514,0.007850647,0.030136108,-0.016708374,-0.017364502,0.012084961,-0.013069153,0.03515625,-0.016098022,0.013717651,-0.003314972,0.022399902,-0.018997192,-0.028701782,0.017990112,-0.01399231,-0.019241333,-0.02720642,-0.0076293945,0.009796143,0.023254395,0.033477783,0.019592285,-0.0134887695,0.06762695,-0.013092041,0.05368042,-0.005290985,-0.0036640167,0.050079346,0.03591919,0.036590576,0.015899658,0.0074882507,-0.038757324,0.012741089,0.053100586,0.02557373,0.0074310303,0.0030708313,-0.012268066,0.03390503,-0.0004453659,0.021652222,-0.02017212,-0.004798889,0.012283325,-0.001572609,-0.007347107,0.0039138794,-0.0024986267,0.009864807,0.04284668,-0.028808594,-0.0040664673,-0.026107788,-0.015930176,0.029220581,-0.0206604,0.0023212433,0.006801605,-0.019470215,0.017425537,-0.025772095,-0.024902344,0.00504303,0.02684021,-0.042388916,-0.024887085,0.00032258034,0.009643555,-0.009132385,0.029281616,0.027954102,0.000027656555,0.004650116,0.04095459,-0.015380859,0.034454346,-0.005706787,0.020095825,0.023529053,0.003414154,-0.027542114,-0.0040740967,0.001531601,-0.01222229,0.0077400208,0.044128418,-0.009498596,0.008834839,-0.008132935,-0.013900757,0.0074768066,0.0044136047,-0.0090408325,0.0009484291,-0.006416321,-0.02017212,-0.0069618225,0.005138397,-0.006477356,0.008399963,-0.023757935,-0.012481689,-0.0048179626,0.024337769,0.02104187,-0.043029785,-0.001203537,0.0082473755,0.017593384,-0.022766113,-0.023529053,-0.01007843,-0.031280518,0.017593384,0.012710571,0.00995636,0.014884949,-0.01928711,0.004009247,0.023925781,0.006439209,0.026107788,0.0016021729,-0.008300781,0.006248474,-0.014678955,-0.0059280396,-0.00762558,-0.015563965,0.014976501,0.010108948,0.003145218,-0.02293396,0.038085938,-0.009239197,0.022903442,0.0045928955,-0.01725769,0.013366699,-0.012924194,-0.0127334595,0.01802063,0.011871338,-0.012550354,-0.017807007,-0.01676941,0.024505615,0.05343628,-0.010108948,-0.00019013882,0.02772522,0.012191772,0.016525269,0.039276123,0.01902771,0.046783447,0.026611328,-0.015655518,-0.013130188,0.023956299,-0.006416321,-0.029067993,0.021011353,-0.0062065125,-0.018814087,0.018692017,0.016815186,-0.0039749146,-0.018249512,-0.012542725,-0.010673523,-0.021972656,0.021881104,-0.017501831,0.024765015,-0.028884888,-0.0036506653,-0.004547119,-0.02041626,-0.054260254,-0.022644043,0.00021076202,-0.0038261414,-0.050811768,0.00075674057,-0.034423828,0.012298584,-0.027908325,-0.02027893,-0.018432617,0.026260376,-0.026992798,-0.0032787323,0.004852295,0.022598267,0.020309448,0.015274048,0.017242432,-0.031433105,-0.035614014,-0.02583313,-0.0059280396,-0.01309967,0.017623901,0.008468628,0.033721924,0.020904541,-0.013023376,0.00053310394,-0.010726929,-0.0051994324,-0.004501343,-0.028686523,-0.012245178,0.01776123,0.021224976,-0.011222839,-0.020553589,0.037506104,-0.026794434,-0.012634277,0.033172607,0.04852295,0.0007452965,0.023773193,-0.023620605,-0.004623413,-0.0060806274,0.003873825,-0.017242432,0.0023956299,0.013328552,0.0023956299,-0.001329422,0.00016784668,0.022399902,-0.012687683,-0.02166748,0.021484375,-0.0023517609,-0.023147583,0.035827637,0.013114929,0.010772705,-0.0015735626,-0.009086609,0.02720642,0.038879395,0.01789856,0.009536743,0.0063476562,0.009086609,-0.010696411,0.011505127,0.017974854,-0.015457153,-0.040924072,-0.027389526,-0.025527954,0.009475708,0.009376526,0.018295288,-0.0021324158,0.022720337,-0.03062439,-0.030944824,-0.02507019,0.024536133,0.0043754578,-0.014678955,-0.023223877,0.0016088486,0.02508545,-0.025604248,0.005622864,-0.033843994,-0.025268555,0.0063972473,-0.023605347,0.019042969,0.006134033,-0.005302429,-0.003604889,-0.010940552,-0.015945435,-0.0029888153,0.039123535,-0.02017212,0.0008535385,0.021453857,0.013053894,-0.02809143,0.015655518,-0.012413025,-0.004070282,0.024429321,-0.015930176,0.015068054,-0.014961243,0.028945923,0.004673004,0.0037994385,0.038238525,-0.00522995,0.009376526,-0.028167725,0.005596161,0.0073661804,-0.0037117004,0.037261963,-0.021530151,-0.0129852295,0.015289307,-0.025054932,-0.030288696,-0.0012931824,0.019088745,0.047729492,-0.011978149,0.040527344,-0.013435364,-0.014419556,0.008956909,0.014251709,-0.02079773,-0.0050468445,0.028320312,0.010948181,-0.0036182404,-0.004219055,-0.014625549,-0.03201294,-0.016555786,0.023803711,-0.004322052,-0.0043563843,0.010322571,0.0124435425,0.055541992,0.0095825195,0.019638062,0.01335907,0.0062561035,0.02671814,0.0021800995,0.056640625,-0.0031852722,-0.029769897,0.007598877,-0.0057754517,-0.0149002075,-0.016357422,-0.0065956116,0.0014047623,-0.03652954,0.012413025,-0.006450653,0.044921875,-0.03149414,0.02128601,-0.028167725,-0.0053901672,-0.0357666,-0.015823364,-0.02357483,0.013252258,0.03656006,-0.004760742,0.017913818,0.0068969727,-0.014091492,0.018432617,0.045013428,-0.014122009,-0.017562866,-0.0052490234,0.01777649,0.0010824203,0.012237549,0.015403748,-0.0062217712,-0.01878357,0.010391235,-0.026794434,0.014526367,-0.0014247894,0.008178711,0.0019073486,-0.003080368,-0.007286072,0.023635864,0.0011453629,-0.012763977,0.004211426,0.017807007,0.037261963,0.032836914,-0.015777588,0.025146484,0.02281189,-0.030029297,0.059326172,-0.0031089783,0.021621704,-0.021270752,0.00008684397,-0.030517578,-0.0211792,-0.007835388,0.01159668],"createdAt":"2026-04-18T18:44:41.169Z","updatedAt":"2026-04-24T02:32:12.532Z","lastSeenAt":"2026-04-24T02:32:12.532Z","tsv":"'/api/v1/charges/278':48,162 '/request':13,28 '0.02':12,27,70,143 '000':57 '0x8335':62 '20':56 '2913':63 '300':90 '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,157,169 'actual':210 'addit':198 'address':87 'advertis':97 'ai':114 'analysi':118 'analyt':108 'api':6,21,37,105,150,168,185 'base':9,24,58,66 'behavior':211 'broader':94 'call':4,19,104 'chain':82 'charg':53 'classif':121 'connect':193 'content':199 'convers':138 'crypto-paid API' 'data':107,111,176 'decim':76 'detail':207 'doc':182 'document':173,208 'embed':122 'emphas':148 'endpoint':32,161,214 'equal':69 'estim':132 'exampl':204 'exchang':127 'export':112 'feed':126 'financ':123 'function':178 'gas':131 'generat':139 'geocod':136 'howev':158 'infrastructur':134 'insight':113 'instant':156 'key':151 'label':164 'learn':116 'limit':154 'lowpaymentfee' 'lowpaymentfee.com':34,95 'machin':115 'metric':109 'network':67 'no-api-key' 'on-chain':80 'on-chain API payment' 'openapi':202 'page':186 'pay':2,17,102 'pay-per-cal':1,16,101 'pay-per-call' 'pay-per-request API' 'payment':42,77 'per':3,18,71,103,144 'platform':96,147 'post':50 'post-endpoint' 'premium':5,20,36,167 'price':125,141,183 'prompt':195 'protocol':43 'provid':35 'quot':130 'rate':128,153 'remain':215 'report':110 'request':51,72,145 'resourc':46 'respons':205 'return':180,190 'schema':203 'second':91 'sentiment':117 'settl':79 'site':189 'span':106 'specif':45,160 'specifi':85 'suit':99 'summar':120 'text':119 'timeout':92 'token':129 'unclear':216 'unit':59 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':135 'valid':137 'via':10,25,39 'wallet':86,194 'web3':124 'without':200 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"e569aa6c-3a20-462c-aa88-253f781bb932","listingId":"97ed0160-76cf-4bd6-82bf-840f6124a6a7","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/278","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:41.169Z"}],"sources":[{"listingId":"97ed0160-76cf-4bd6-82bf-840f6124a6a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/278","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:41.169Z","lastSeenAt":"2026-04-24T02:32:12.532Z"}],"details":{"listingId":"97ed0160-76cf-4bd6-82bf-840f6124a6a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/278 \\\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":"The endpoint returns a 402 challenge requesting up to 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/278"},{"claim":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/278"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-API-key access to paid endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Applications requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.661Z"},"updatedAt":"2026-04-24T02:32:12.532Z"}}