x402basequality 0.30

Premium API access endpoint on Base via x402 — pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/apikeys/40

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network.

The specific endpoint `/api/v1/apikeys/40` is labeled "Premium API Access" in the x402 challenge. Its exact functionality is not documented beyond that label — it may provide API key generation or management, but this is speculative based on the URL path. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout.

The platform advertises no API keys required, no rate limits, and instant access. Documentation pages (/docs, /pricing, /api, /README) all rendered only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas and usage guides are unavailable.

Capabilities

x402-paymentusdc-basepay-per-requestapi-key-managementpost-endpoint

Use cases

  • —Programmatically obtaining or managing API keys via a single paid request
  • —Agent-driven access to a premium API resource without pre-registration
  • —Demonstrating x402 micropayment integration on Base

Fit

Best for

  • —Developers exploring x402 pay-per-call patterns on Base
  • —AI agents that need to purchase API access on-the-fly without signup
  • —Projects needing low-cost, no-commitment API access

Not for

  • —Users who need detailed API documentation or OpenAPI schemas before integrating
  • —High-volume use cases where $0.02 per request adds up significantly
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/40 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/40
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/apikeys/40 is undocumented. All documentation pages render only 'Connect wallet' with no content. No request/response schema, no examples, and no explanation of what 'Premium API Access' actually returns. Pricing is clear ($0.02/request in USDC on Base).

Warnings

  • —The exact purpose and response format of /api/v1/apikeys/40 is unknown — 'Premium API Access' is the only description available.
  • —All documentation pages (/docs, /pricing, /api, /README) returned no substantive content, only a 'Connect wallet' prompt.
  • —No OpenAPI spec, no request/response schema, and no usage examples are available.
  • —The broader platform lists many endpoints (AI, finance, analytics, utils) but none have documented schemas either.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:05:44Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/FKHZjS
Premium API access endpoint on Base via x402 — pay $0.02 per request in USDC. — Clawmart · Clawmart