x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/collections/14

What it does

lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.

The specific endpoint `/api/v1/collections/14` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.

Documentation is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. It is unclear what data or functionality the `/collections/14` endpoint specifically returns. The broader site advertises categories like metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation, but none of these map directly to the `/collections/14` path.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networkno-api-keyjson-responsepost-method

Use cases

  • —Accessing paid API endpoints without creating accounts or managing API keys
  • —Making one-off data or utility requests with per-call USDC micropayments
  • —Integrating x402-compatible agents with low-friction paid endpoints

Fit

Best for

  • —Developers wanting zero-signup API access via crypto micropayments
  • —AI agents using x402 protocol for autonomous API consumption
  • —Users who prefer pay-as-you-go with no rate limits or commitments

Not for

  • —Users who need detailed API documentation or schemas before integrating
  • —High-volume consumers who want bulk pricing or subscription discounts
  • —Developers who cannot settle payments in USDC on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/collections/14 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/collections/14
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what /collections/14 actually returns. The listing is effectively a stub.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format for /collections/14
  • —It is unclear what data or functionality the /collections/14 endpoint provides
  • —The broader site lists many endpoint categories but /collections/14 does not map to any named endpoint

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 17:53:41Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-19
Last seen2026-04-22

Agent access

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