Developer builds accountless AI agent storage service paid via x402 crypto protocol

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A developer created a file and JSON storage service for AI agents that requires no account, API key, or credit card, instead charging $0.01 in USDC per call using the x402 payment protocol. Agents pay autonomously by signing an EIP-3009 transfer, with a Coinbase facilitator handling verification, settlement, and gas fees. Building the service surfaced several technical issues, including a flaky public testnet facilitator causing intermittent payment failures, a Cloudflare Workers limit on password-hashing iterations that only triggered in production, and a request-body stream being consumed before retry attempts. The developer resolved these through defensive patterns such as treating failed settlements as no-ops, cloning request bodies before first use, and caching only fully initialized objects. Two full end-to-end mainnet test runs across 10 settlements each confirmed that no funds moved on failed transactions, and the service is now publicly accessible on testnet.

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