x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/apikeys/54

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints on the lowpaymentfee.com platform, which offers a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind per-request x402 micropayments settled in USDC on the Base network.

The specific endpoint `/api/v1/apikeys/54` is listed as "Premium API Access" and costs $0.02 per call (the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC, which at 6 decimals equals $0.02). Payment is made via the x402 exact scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests and returns `application/json`.

The platform advertises a simple pricing model: $0.02 per request across all endpoints, with no API keys required, no rate limits, and instant access. However, the exact functionality of this particular endpoint (`/api/v1/apikeys/54`) is unclear — the name suggests it may generate or retrieve an API key, but no documentation or schema details are available beyond the x402 challenge metadata. The docs, pricing, and README pages all rendered only a "Connect wallet" prompt with no substantive content.

Capabilities

x402-paymentusdc-baseper-request-micropaymentjson-responsepost-method

Use cases

  • —Acquiring an API key or premium access token via a single micropayment
  • —Programmatic pay-per-use access without traditional subscription or signup
  • —Agent-driven API key provisioning on the Base network

Fit

Best for

  • —Developers wanting no-signup, pay-per-call API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over traditional billing

Not for

  • —Users who need detailed API documentation before purchasing
  • —Anyone without a Base-network USDC wallet
  • —High-volume consumers who need bulk pricing or rate-limit guarantees

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/54 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/54
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages only show a wallet-connect prompt. The actual functionality of this specific endpoint is ambiguous.

Warnings

  • —No documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content.
  • —The exact purpose of /api/v1/apikeys/54 is unclear; the name suggests API key provisioning but no schema or description confirms this.
  • —No request body schema or response schema is provided.
  • —No OpenAPI spec or ai-plugin manifest found.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:18:06Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/MjvzW9
x402-gated API key endpoint on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart