x402basequality 0.35

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/87

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at /api/v1/payments/87 is labeled "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises multiple API categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text 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, the specific functionality behind the /api/v1/payments/87 endpoint is not documented beyond its "Premium API Access" label, and the docs, pricing, and README pages returned only a wallet-connect prompt with no substantive content.

The endpoint is live and returns a well-formed x402 challenge (HTTP 402) with scheme "exact" on the Base network, paying to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The input method is POST and the endpoint is marked discoverable. No OpenAPI schema, request/response examples, or detailed documentation were found.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Integrating pay-as-you-go API calls into agent workflows without API key management
  • —Testing x402 protocol payment flows against a live endpoint

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-call API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Projects needing low-cost ($0.02) per-request pricing with no rate limits

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —Applications requiring non-crypto payment methods
  • —High-volume use cases where subscription pricing would be more economical

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/87 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/87
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but the actual functionality behind "Premium API Access" is undocumented. No OpenAPI schema, no request/response examples, and all doc pages return only a wallet-connect stub. The listing is essentially a stub with pricing info only.

Warnings

  • —The specific functionality of /api/v1/payments/87 ('Premium API Access') is not documented — it is unclear what data or service it returns.
  • —All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' prompt with no substantive content.
  • —No OpenAPI schema or request/response examples are available.
  • —The platform lists many API categories (AI, finance, data, infrastructure) but none have documented schemas or sample payloads.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:19:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/ZGc5S4
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart