{"id":"e3f3cf7d-85ca-4afb-b5f8-15c3cd168b68","shortId":"MqV8BF","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/222` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing. However, the probed endpoint `/api/v1/payments/222` does not clearly map to any of these named services, and its actual response payload is undocumented.\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 beyond the x402 challenge's outputSchema stub, and no examples of what the endpoint actually returns. Callers should expect a JSON response (mimeType is application/json) but the structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint path /api/v1/payments/222 does not match any of the named services listed on the homepage","Actual functionality and response payload are completely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/222","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/payments/222","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 with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the specific endpoint path '/api/v1/payments/222' doesn't correspond to any named service on the landing page. The actual functionality behind this endpoint is 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'/api/v1/payments/222':58,175 '/docs':198 '/pricing':200 '/readme':202 '/request':169 '0.02':12,28,89,168 '000':84 '0x8335':74 '20':83 '2913':75 '6':94 'Base network API' 'USDC API' 'accept':65 'access':7,23,44,63 'across':126 'actual':188,238 'advertis':124 'ai':136 'amount':81 'analysi':140 'analyt':130 'api':6,22,42,62,97 'application/json':248 'attach':108 'base':9,25,52,77,85 'base-network' 'beyond':224 'broader':121 'call':4,20,91 'caller':106,240 'categori':128 'challeng':227 'classif':143 'clear':178 'collect':36 'commit':103 'connect':208 'contract':73 'convers':160 'crypto-paid endpoint' 'data':129,133 'decim':95 'detail':215 'document':193 'embed':144 'endpoint':43,56,125,164,174,237 'equal':88 'estim':154 'exampl':233 'exchang':149 'expect':242 'export':134 'extrem':195 'feed':148 'financ':145 'four':127 'gas':153 'generat':161 'geocod':158 'header':113 'host':34 'howev':171 'infrastructur':156 'insight':135 'json':244 'json-response' 'key':98 'label':60 'learn':138 'limit':100 'list':163 'lowpaymentfee' 'lowpaymentfee.com':33,122 'machin':137 'map':179 'maximum':80 'metric':131 'micropayment API' 'mimetyp':246 'name':184 'network':53 'no-api-key' 'openapi':219 'outputschema':229 'page':203 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call' 'pay-per-request':38 'payload':190 'payment':48,68,112,118 'per':3,13,19,29,40,90 'platform':123 'post':66 'post-method' 'premium':5,21,61 'premium API access' 'price':147,170 'probe':173 'prompt':210 'proof':119 'protocol':49 'quot':152 'rate':99,150 'render':205 'report':132 'request':14,30,41,67 'request/response':222 'requir':105 'respons':189,245 'return':239 'schema':223 'sentiment':139 'servic':185 'settl':70 'share':165 'simpli':107 'spars':196 'spec':220 'specif':55 'structur':251 'stub':230 'summar':142 'technic':214 'text':141 'token':151 'undocu':192 'unit':86 'unknown':253 'upfront':102 'usdc':16,32,72,92 'usdc-settlement' 'use':93 'util':157 'valid':116,159 'via':10,26,45 'wallet':209 'web3':146 'x':111 'x-payment':110 'x402':11,27,47,117,226 'x402 API' 'x402-payment'","prices":[{"id":"ab27cc54-69be-4d44-a00d-895fa6ec25ba","listingId":"e3f3cf7d-85ca-4afb-b5f8-15c3cd168b68","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/payments/222","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:53.524Z"}],"sources":[{"listingId":"e3f3cf7d-85ca-4afb-b5f8-15c3cd168b68","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/222","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:53.524Z","lastSeenAt":"2026-04-23T16:07:16.587Z"}],"details":{"listingId":"e3f3cf7d-85ca-4afb-b5f8-15c3cd168b68","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/222 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/222"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/222"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without signing up for an account or obtaining API keys","Making one-off paid API calls settled instantly in USDC on Base","Integrating pay-per-request services into autonomous agent workflows"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.664Z"},"updatedAt":"2026-04-23T16:07:16.587Z"}}