Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog 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). Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint `/api/v1/wire/178` is listed as "Premium API Access" and accepts HTTP POST requests. Payment is settled on-chain via the x402 exact-payment scheme: the caller attaches an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) to the payTo address on Base. The response MIME type is application/json. The x402 challenge was captured live and confirms the endpoint is operational.
Documentation 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 spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The name "Premium API Access" and the path `/api/v1/wire/178` do not clearly indicate what data or functionality this specific endpoint provides, making it difficult to determine its exact purpose without making a paid request.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to various data and utility endpoints
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Users needing detailed API documentation or schemas before purchasing
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible wallet or USDC balance
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/178 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The x402 challenge is live and confirms the endpoint is operational with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/wire/178 is unclear. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No OpenAPI or schema documentation available — endpoint purpose is unclear
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The specific functionality of /api/v1/wire/178 ('Premium API Access') is not described anywhere
- —No request body schema or response schema documented
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/wire/178
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/178