x402basequality 0.35

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/41

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 variety of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.

The specific endpoint `/api/v1/apikeys/41` appears to be an API-key provisioning or management resource. The x402 challenge confirms it is live, accepting POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to the payee address 0x1A2B…85F3. The response MIME type is application/json. No OpenAPI schema, detailed documentation, or example payloads were found beyond the landing page listing; the /docs, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content.

The platform advertises no API keys required, no rate limits, and instant access — a pure pay-per-call model. However, the lack of documentation means the exact request body format and response schema for this particular endpoint are unknown. Agents should be prepared to experiment or rely on the generic x402 flow (attach an X-PAYMENT header with a signed USDC payment) and inspect the JSON response.

Capabilities

x402-paymentusdc-basepay-per-callapi-key-provisioningjson-response

Use cases

  • —Programmatically obtaining or managing API keys via a single paid request
  • —Integrating pay-per-call API access into agent workflows without subscription overhead
  • —Demonstrating x402 payment protocol usage on Base with USDC

Fit

Best for

  • —Agents needing on-demand API key provisioning without signup
  • —Developers exploring x402 payment-gated endpoints
  • —Low-volume, pay-as-you-go API consumers

Not for

  • —High-volume users who need bulk pricing or rate-limit guarantees
  • —Users who need detailed API documentation or SDKs before integrating
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/41 \
  -H "X-PAYMENT: <signed-x402-payment-header>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/41
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response payloads, and the /docs page is empty. The purpose of this specific endpoint (apikeys/41) is only vaguely described as 'Premium API Access' with no further detail.

Warnings

  • —No API documentation available — /docs, /pricing, and /README pages all return only a wallet-connect prompt with no content.
  • —The exact request body schema and response format for /api/v1/apikeys/41 are unknown.
  • —The purpose of 'apikeys/41' is unclear — it may be a demo or placeholder endpoint.
  • —No OpenAPI or ai-plugin manifest found.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:23:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/m9FNmS
x402-gated API key endpoint on Base, paying $0.02 in USDC per request. — Clawmart · Clawmart