{"id":"ecc41f4a-481f-4d0d-84e2-11afdacbb63a","shortId":"ePhps8","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment challenge. The provider operates a broad suite of pay-per-call 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/generate/resource/123` is listed under the \"Premium API Access\" label. The x402 challenge confirms it accepts POST requests, settles in USDC (contract 0x8335…2913) on Base via the \"exact\" payment scheme, and requires a maximum of 20,000 units (which at 6 USDC decimals equals $0.02). The response MIME type is application/json. A 300-second payment timeout is configured.\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, and no usage examples available. The exact functionality behind the `/api/v1/generate/resource/123` path is unclear; the name suggests a generation or resource-creation endpoint, but no input parameters or output fields are documented.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-request-billing","json-response","post-method","no-api-key","no-rate-limit"],"categories":["infrastructure","api-gateway"],"synonyms":["pay-per-call API","x402 API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only a wallet-connect prompt","No OpenAPI or JSON schema describing request parameters or response format","The exact functionality of /api/v1/generate/resource/123 is unknown; 'Premium API Access' is a generic label","The provider site lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/123","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/generate/resource/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC payments on Base. However, documentation is effectively absent — all doc pages show only 'Connect wallet' — and there is no OpenAPI spec, no input/output schema, and no explanation of what this specific resource endpoint actually does. The listing is largely a 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'/api/v1/generate/resource/123':110,209 '/docs':173 '/pricing':175 '/readme':177 '0.02':86,154 '000':146 '0x8335':131 '20':145 '2913':132 '300':162 '6':150 'Base network API' 'USDC API' 'accept':124 'access':6,20,36,117 'ai/ml':57 'analysi':60 'analyt':56 'api':5,19,35,53,98,116 'application/json':160 'avail':203 'base':8,22,94,134 'behind':37,207 'broad':46 'call':52 'challeng':41,121 'classif':62 'commit':106 'configur':167 'confirm':122 'connect':183 'contract':130 'convers':79 'creation':221 'crypto-paid API' 'data':55 'decim':152 'detail':190 'document':168,231 'embed':63 'endpoint':30,82,109,222 'equal':153 'estim':73 'exact':137,205 'exampl':202 'exchang':68 'extrem':170 'feed':67 'field':229 'financ':64 'function':206 'gas':72 'gate':3,17 'generat':80,217 'geocod':77 'infer':58 'infrastructur':75 'input':225 'json-response' 'key':99 'label':118 'limit':102 'list':112 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':143 'micropayment API' 'mime':157 'minimum':105 'name':214 'network':95 'no-api-key' 'no-rate-limit' 'openapi':194 'oper':44 'output':228 'page':178 'paid':9,23 'paramet':226 'path':210 'pay':50 'pay-per-cal':49 'pay-per-call API' 'payabl':89 'payment':40,138,164 'per':11,25,51,87 'per-request':10,24 'per-request-billing' 'post':125 'post-method' 'premium':4,18,34,115 'premium API access' 'price':66,84 'prompt':185 'provid':33,43 'quot':71 'rate':69,101 'render':180 'request':12,26,88,126 'request/response':197 'requir':141 'resourc':220 'resource-cr':219 'respons':156 'schema':198 'scheme':139 'second':163 'sentiment':59 'settl':127 'span':54 'spars':171 'spec':195 'specif':108 'suggest':215 'suit':47 'summar':61 'technic':189 'timeout':165 'token':70 'type':158 'unclear':212 'unit':147 'usag':201 'usdc':14,28,91,129,151 'usdc-on-base' 'util':76 'valid':78 'via':135 'wallet':184 'web3':65 'x402':2,16,39,120 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e90006f8-89bb-418e-8e63-08cd0743f8a1","listingId":"ecc41f4a-481f-4d0d-84e2-11afdacbb63a","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/generate/resource/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:02.716Z"}],"sources":[{"listingId":"ecc41f4a-481f-4d0d-84e2-11afdacbb63a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:02.716Z","lastSeenAt":"2026-04-23T20:01:20.257Z"}],"details":{"listingId":"ecc41f4a-481f-4d0d-84e2-11afdacbb63a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/123 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/123","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 v1 challenge, accepting USDC on Base via exact scheme with maxAmountRequired of 20000 (≈$0.02)","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/123"},{"claim":"Provider lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all priced 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":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a generation/resource endpoint with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API key management","Integrating pay-as-you-go API calls into Web3 workflows on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-friction API access without rate limits or subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring fiat-only payment rails with no crypto involvement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:18:28.656Z"},"updatedAt":"2026-04-23T20:01:20.257Z"}}