{"id":"bd2dd8e9-23e2-49f3-9d28-f13bc4c30f7a","shortId":"RymsaT","kind":"x402","title":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/collections/1` appears to be a collections-level entry point described as \"Premium API Access.\" The broader 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).\n\nAll endpoints are priced at $0.02 per request, settled in USDC on the Base network. The x402 challenge for this endpoint shows a maxAmountRequired of 20000 base units of USDC (0x8335…2913), which equals $0.02 given USDC's 6 decimals. The platform advertises no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any individual endpoint. The actual behavior and response format of `/api/v1/collections/1` is unknown — it may return a listing of available collections or serve as a gateway. Without documentation or example responses, integrators will need to experiment to understand what this endpoint returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per request api","micropayment api","base network api","usdc api","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","Unknown response format — no example responses or output schema details","The specific behavior of /api/v1/collections/1 is unclear; it may be a meta-endpoint listing collections rather than a functional API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/1","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/collections/1","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 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet.' There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint actually returns. The listing is effectively a stub with pricing 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'learn':94 'level':69 'limit':166 'list':234 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':93 'maxamountrequir':141 'may':231 'metric':87 'micropayment api' 'minimum':168 'need':250 'network':58,132 'offer':40 'openapi':207 'page':192 'pay':2,21,45 'pay per request api' 'pay-per-request':1,20,44 'payment':53,177 'per':3,22,46,124 'per-request-billing' 'platform':79,159 'point':71 'premium':74 'price':103,121,189 'prompt':199 'protocol':54 'quot':108 'rate':106,165 'readm':191 'report':88 'request':4,23,47,125,181 'request/response':210 'respons':224,247 'return':194,232,258 'schema':208 'sentiment':95 'sentiment-analysis' 'serv':239 'settl':126 'show':139 'simpli':173 'spars':185 'specif':60 'substant':202 'suit':42 'summar':98 'text':97 'text-summarization' 'token':107 'understand':254 'unit':145 'unknown':229 'usdc':128,147,154 'usdc api' 'usdc-settlement' 'util':15,34,113 'utility-apis' 'valid':115 'via':9,28,50 'wallet':198 'web3':102 'without':243 'x402':10,29,52,134,176 'x402 api' 'x402-payment'","prices":[{"id":"aa88ad04-7a02-4d33-b01d-ab35cf953377","listingId":"bd2dd8e9-23e2-49f3-9d28-f13bc4c30f7a","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/collections/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:51.771Z"}],"sources":[{"listingId":"bd2dd8e9-23e2-49f3-9d28-f13bc4c30f7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:51.771Z","lastSeenAt":"2026-04-22T05:31:54.519Z"}],"details":{"listingId":"bd2dd8e9-23e2-49f3-9d28-f13bc4c30f7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/1"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with micropayment-based access","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Agents or developers who want instant, keyless API access via crypto micropayments","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions","x402-compatible AI agents operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.708Z"},"updatedAt":"2026-04-22T05:31:54.519Z"}}