Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/v1/customers/45` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform lists additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point.
Documentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the `/api/v1/customers/45` endpoint expects or what response it returns.
Capabilities
Use cases
- —Accessing premium data or customer records on a per-call basis without subscriptions
- —Running AI inference (sentiment, summarization, classification, embeddings) with crypto micropayments
- —Fetching financial data like token quotes, exchange rates, and gas estimates
- —Performing utility operations like geocoding, validation, and data conversion
Fit
Best for
- —Developers who want instant API access without signup or API key management
- —Agents and bots that can settle payments in USDC on Base via x402
- —Projects needing low-cost, pay-as-you-go access to a variety of utility endpoints
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/45 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The purpose of the specific /api/v1/customers/45 endpoint is unclear beyond its generic 'Premium API Access' label.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request/response formats for any endpoint
- —The purpose and expected input of /api/v1/customers/45 is undocumented and unclear
- —The broad catalog of endpoints (AI, finance, utilities) is listed but none have verifiable documentation
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/customers/45
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/customers/45