Task

Letters

2 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.

PostAgent x402 REST usage

Print and mail physical US letters (PDF, HTML, Markdown, DOCX, or image) and postcards via USPS, paid in USDC — with certified/registered proof options and standalone address verification at POST /v1/verify. Integration...

api.postagent.sh Crypto & Payments 1 calls / 30d checked 2026-10-26

1.24 USDC per call per call

free-audiobooks-letters x402 REST

Free Letters audiobooks: public-domain recordings in LibriVox's "Letters" genre (61 titles) with runtime, language and mp3 zip / RSS / archive.org links. Add words to narrow. $0.01 per page of 20.

library.intel.rallylive.ca Media & Creative checked 2026-10-26

no price published

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