x402basequality 0.30

Pay-per-call lab results endpoint on Base via x402, settled in USDC at $0.02/request.

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

What it does

This endpoint at lowpaymentfee.com provides premium API access to lab results data (resource path `/api/v1/lab/results/3`) using the x402 payment protocol. It is live and returns a 402 challenge requiring USDC payment on the Base network. The price per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 "exact" scheme to the specified wallet address, with no API keys or rate limits required.

The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, this specific listing covers only the `/api/v1/lab/results/3` endpoint, which is described generically as "Premium API Access" without further documentation on what "lab results" data it returns.

The endpoint accepts HTTP POST requests and returns `application/json` responses. No OpenAPI schema, request body schema, or response examples are provided by the site, so the exact input parameters and output format are unknown. The x402 challenge specifies a maximum timeout of 300 seconds and uses USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.

Capabilities

x402-paymentusdc-basepay-per-calljson-responsehttp-postno-api-key

Use cases

  • —Retrieving lab results data on a per-call payment basis without needing an API key
  • —Integrating pay-per-use data access into autonomous agent workflows
  • —Testing x402 payment protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing keyless, pay-per-call data access on Base
  • —Low-volume or sporadic API consumers who prefer no subscriptions

Not for

  • —Users who need detailed documentation or well-defined schemas before integration
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-compatible USDC wallet

Quick start

# 1. Probe the endpoint to get the 402 challenge
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/3
# Returns 402 with x402 payment challenge
# 2. Construct X-PAYMENT header with signed USDC payment (20000 base units = $0.02)
#    and re-send the POST request with the header attached.

Endpoint

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

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation on what 'lab results' data is returned, no request/response schema, and no examples. The description is entirely generic ('Premium API Access'). The crawled pages provide no additional detail about this specific endpoint.

Warnings

  • —No documentation exists for what data /api/v1/lab/results/3 actually returns
  • —No request body schema or response schema available
  • —The endpoint name 'lab results' is unexplained — unclear if this is test/demo data or a real service
  • —No OpenAPI spec, no README content, and ancillary pages only show 'Connect wallet'

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:22:20Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/P5uWBK
Pay-per-call lab results endpoint on Base via x402, settled in USDC at $0.02/request. — Clawmart · Clawmart