x402basequality 0.35

x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/collections/28

What it does

lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and general utilities. Every endpoint costs $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/collections/28` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). It accepts POST requests and responds with `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the x402 "exact" scheme.

Documentation is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The site's landing page lists sibling endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure) but provides no detail on what `/api/v1/collections/28` specifically returns or what input it expects. Without further documentation it is unclear whether this is a bundle/collection endpoint or a standalone resource.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apino-api-keypost-method

Use cases

  • —Programmatic access to a bundled API collection via a single x402 payment
  • —Agent-driven workflows that need keyless, per-call billing on Base
  • —Testing x402 payment flows against a low-cost live endpoint

Fit

Best for

  • —Developers experimenting with x402 protocol integrations
  • —AI agents that need frictionless pay-per-use API access without credentials
  • —Low-volume consumers who want no subscription overhead

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-throughput production workloads requiring predictable latency and uptime guarantees
  • —Anyone who cannot settle payments in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/collections/28 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/collections/28
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of '/collections/28' specifically is undocumented.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —All doc/pricing/README pages render only 'Connect wallet' with no content
  • —The specific function of /api/v1/collections/28 is unclear — it may be a meta-collection or a standalone resource
  • —No request body schema or response schema is documented anywhere

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 17:50:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/wmygwy
x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required. — Clawmart · Clawmart