{"id":"de5d75f2-399e-4a0f-8a57-03a6ca9b4635","shortId":"j7CUuV","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 site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/charges/319` is listed as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme, settling to the specified wallet address. The endpoint accepts HTTP POST requests and returns application/json responses.\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 description of what this particular endpoint returns or what parameters it accepts. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what data or functionality \"Premium API Access\" specifically provides versus the other named endpoints on the platform.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API"],"warnings":["No documentation available — all doc/API/pricing/README pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/charges/319' specifically (vs. other named endpoints) is unclear","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/319","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/319","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, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. It is unclear what this specific endpoint actually returns or what inputs it expects.","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":"2026-04-19T03:45:17.601Z","embedding":[-0.025512695,-0.032165527,0.041900635,0.011734009,0.017990112,-0.026428223,-0.022445679,0.0418396,0.06329346,-0.072753906,0.028900146,-0.041534424,-0.028747559,-0.035247803,-0.027633667,0.009429932,-0.0067710876,0.00831604,-0.043792725,0.03463745,0.03050232,-0.030517578,-0.018356323,0.036834717,0.0008893013,-0.03213501,-0.0146484375,-0.010719299,-0.018157959,-0.026504517,0.036315918,-0.020828247,-0.0019044876,0.017089844,-0.013343811,-0.017959595,-0.009101868,0.03982544,0.033233643,-0.008323669,-0.0014820099,-0.058135986,-0.005317688,-0.0017709732,-0.05529785,-0.0076904297,0.009216309,-0.01939392,-0.00969696,0.008018494,-0.04269409,-0.0065574646,-0.0048179626,-0.012481689,0.010345459,0.006801605,-0.0076904297,-0.0057525635,-0.0012693405,0.008377075,-0.00045323372,-0.06463623,-0.017623901,-0.008102417,-0.005252838,0.055877686,-0.008224487,0.053588867,0.002456665,0.047851562,0.045776367,0.05203247,0.036590576,0.0040626526,0.0072402954,0.0007305145,-0.0032672882,0.05895996,-0.011566162,-0.005821228,-0.027862549,-0.0025081635,-0.05328369,-0.004070282,-0.019348145,-0.0357666,-0.018630981,0.01914978,-0.025527954,0.01991272,-0.05911255,0.0011701584,-0.016860962,0.004749298,0.0079193115,0.000042796135,-0.011291504,0.032562256,-0.019577026,0.022338867,0.012176514,-0.03945923,0.021438599,0.0064048767,0.042510986,0.049957275,0.025436401,0.03173828,-0.0037002563,-0.026443481,-0.015205383,0.015533447,-0.006790161,-0.012550354,0.012237549,0.015068054,-0.015960693,0.009796143,-0.026977539,0.014595032,-0.050048828,0.045898438,0.027420044,-0.02418518,0.02468872,-0.036346436,-0.003993988,0.01411438,-0.034484863,-0.0032978058,0.028640747,0.018798828,0.03515625,-0.023010254,-0.028274536,0.0026626587,-0.02468872,-0.028549194,-0.04449463,-0.0335083,0.029159546,-0.029327393,0.029434204,0.035339355,-0.092285156,-0.015853882,-0.045715332,0.006389618,-0.030334473,-0.00434494,-0.015403748,0.03050232,-0.0137786865,-0.010131836,-0.023651123,-0.015808105,0.0018444061,0.035247803,-0.030593872,0.043395996,-0.00020444393,0.025634766,0.010856628,0.004722595,0.039093018,0.034179688,0.002702713,-0.0692749,-0.087524414,-0.030395508,-0.0033187866,-0.023788452,-0.04159546,-0.010101318,0.0060157776,-0.06890869,-0.014717102,0.0009841919,-0.0056037903,-0.033569336,-0.011131287,-0.02708435,0.024642944,-0.00035214424,-0.06933594,-0.024261475,-0.024368286,0.072753906,0.026504517,0.005947113,0.036468506,-0.010131836,0.057800293,0.019927979,-0.028747559,-0.027709961,0.024032593,-0.009300232,0.022964478,0.0044555664,-0.003189087,-0.029434204,0.031204224,0.058288574,0.029663086,-0.023742676,0.0016222,-0.053131104,-0.044158936,-0.042236328,0.007381439,0.0035705566,0.008636475,0.04220581,-0.032287598,-0.034851074,-0.0036849976,0.0065727234,0.0146865845,0.05230713,0.008850098,-0.006111145,0.011062622,0.010864258,-0.038726807,0.0345459,0.028549194,0.010856628,-0.022232056,-0.030227661,0.022216797,0.026412964,-0.028045654,0.005493164,-0.018600464,0.026428223,0.015914917,0.029769897,0.033416748,-0.019348145,-0.023529053,-0.026687622,-0.005683899,0.03237915,0.012237549,-0.037109375,-0.04260254,-0.0791626,0.050323486,0.040283203,0.048980713,-0.0044059753,0.0128479,-0.026428223,-0.015716553,-0.082214355,0.058746338,0.08319092,-0.016647339,-0.018341064,0.010810852,-0.011405945,-0.031341553,-0.012527466,-0.013145447,-0.031402588,-0.024780273,0.011650085,-0.045196533,0.00957489,0.0046463013,0.02420044,0.06549072,-0.013412476,-0.053344727,-0.030517578,0.0068244934,0.0078048706,-0.01940918,0.0007853508,-0.012969971,0.0231781,0.02532959,-0.0082473755,0.028381348,0.0022392273,0.023208618,-0.010536194,-0.008590698,-0.02192688,-0.02760315,0.0024051666,-0.013633728,-0.0690918,0.0099487305,0.002506256,0.06512451,-0.052124023,0.051971436,-0.0040512085,0.0025501251,0.062805176,-0.0038223267,-0.0491333,0.019836426,0.026504517,0.025344849,0.045135498,-0.0016222,-0.037384033,-0.011962891,0.07867432,-0.020828247,-0.011161804,0.011688232,0.008453369,0.030288696,0.008522034,-0.068237305,-0.030136108,-0.009750366,-0.029449463,0.022094727,-0.024154663,0.019744873,-0.017318726,0.0032463074,-0.018066406,-0.0024108887,-0.03164673,0.010620117,-0.028961182,0.018173218,-0.025009155,-0.017028809,0.03253174,0.016555786,-0.017700195,0.0143585205,0.042510986,0.030761719,-0.011428833,-0.044036865,-0.015197754,-0.0019989014,0.0006637573,0.025665283,0.02368164,0.017974854,0.04949951,-0.037353516,0.025726318,0.038085938,0.015289307,0.035247803,-0.003206253,0.0073509216,-0.061553955,-0.05609131,-0.027297974,-0.040802002,0.030075073,0.013694763,-0.0021572113,0.048706055,0.0041236877,-0.016967773,-0.036010742,0.022354126,-0.05142212,-0.014892578,0.03656006,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'/request':13,28 '0.02':12,27,88,141 '000':130 '0x8335':135 '20':129 '2913':136 '402':216 'Base network API' 'USDC pay-per-call' 'accept':158,210 'access':7,22,38,118,231 'address':155 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,117,172,230 'application/json':164 'base':9,24,96,131,138 'broad':48 'call':4,19 'captur':218 'catalog':49 'challeng':124,217 'classif':64 'commit':108 'confirm':214 'connect':181 'content':187 'convers':81 'data':57,226 'descript':199 'detail':198 'doc':171 'document':166,221 'embed':65 'endpoint':32,84,111,157,204,212,238 'equal':140 'estim':75 'exact':148 'exampl':195 'exchang':70 'extrem':168 'feed':69 'financ':66 'function':228 'gas':74 'generat':82 'geocod':79 'host':46 'http':159 'http-post' 'infer':60 'infrastructur':77 'json-response' 'key':101 'limit':104 'list':114 'live':215 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':144 'maxamountrequir':127 'micropayment API' 'minimum':107 'name':237 'network':97 'no-api-key' 'openapi':191 'page':176 'paramet':208 'particular':203 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-request':51 'payabl':91 'payment':42,142 'per':3,18,53,89 'platform':241 'post':160 'premium':5,20,36,116,229 'price':68,86,173 'prompt':183 'protocol':43 'provid':35,233 'quot':73 'rate':71,103 'readm':175 'render':178 'request':54,90,161 'request/response':194 'respons':165 'return':120,163,205 'schema':192 'scheme':149 'sentiment':61 'settl':150 'site':45 'span':56 'spars':169 'specif':110,232 'specifi':153 'standard':122 'summar':63 'token':72 'unclear':224 'unit':132 'usdc':15,30,93,134 'usdc-base' 'util':78 'valid':80 'versus':234 'via':10,25,39,145 'wallet':154,182 'web3':67 'without':220 'x402':11,26,41,123,147 'x402 API' 'x402-payment'","prices":[{"id":"2fdb048c-700c-45ce-a437-b50fa347d6e3","listingId":"de5d75f2-399e-4a0f-8a57-03a6ca9b4635","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/319","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:54.449Z"}],"sources":[{"listingId":"de5d75f2-399e-4a0f-8a57-03a6ca9b4635","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/319","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:54.449Z","lastSeenAt":"2026-04-22T09:01:01.230Z"}],"details":{"listingId":"de5d75f2-399e-4a0f-8a57-03a6ca9b4635","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/319 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/319"},{"claim":"Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol with minimal cost per call","AI agents that need keyless, pay-as-you-go API access","Crypto-native applications already operating on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput batch processing where per-call pricing is impractical","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.116Z"},"updatedAt":"2026-04-22T09:01:01.230Z"}}