x402basequality 0.30

x402-gated API key endpoint on Base, paying $0.02 in USDC per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/apikeys/3

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 suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.

The specific endpoint `/api/v1/apikeys/3` accepts POST requests and returns JSON. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys required, no rate limits, and instant access.

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 usage examples available. The exact functionality behind the "Premium API Access" label at this particular path (`/apikeys/3`) is unclear; it may provision or return an API key, but this is not documented. The endpoint is confirmed live via a valid 402 challenge response.

Capabilities

x402-paymentusdc-basemicropaymentpay-per-requestjson-apipost-method

Use cases

  • —Acquiring API keys or premium access tokens via a single micropayment
  • —Agent-driven programmatic access to gated API resources without traditional subscriptions
  • —Integrating pay-per-use API access into automated workflows

Fit

Best for

  • —Developers wanting subscription-free, pay-per-call API access
  • —AI agents that need to autonomously purchase API credentials
  • —Users who prefer crypto micropayments over traditional billing

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Anyone without a Base-compatible USDC wallet
  • —High-volume consumers who would benefit from bulk pricing or subscriptions

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/3 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/3
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation, no request/response schema, and no examples. The exact purpose of the /apikeys/3 path is undocumented. This is effectively a stub listing.

Warnings

  • —No OpenAPI spec or schema documentation available
  • —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
  • —The exact functionality of /api/v1/apikeys/3 ('Premium API Access') is not documented — it is unclear what this endpoint returns
  • —No request body schema or response schema is provided

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:16:13Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/xFJFHX
x402-gated API key endpoint on Base, paying $0.02 in USDC per request. — Clawmart · Clawmart