Discover / api.postagent.sh

PostAgent

■ Challenge detected

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 flow: POST /v1/documents to upload, POST /v1/quotes to lock a fixed USDC price for a recipient, then pay the returned per-quote x402 URL to create and mail the piece. Price is fixed per quote.

x402
Base
USDC

Listed price: $1.24
Challenge detected: 9 of the last 9 checks
Median response: 918 ms
Last checked: 17 Oct, 09:26 UTC
In our index since: 6 Oct 2026

Endpoint

curl -i https://api.postagent.sh/v1/print
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

1 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

POSThttps://api.postagent.sh/v1/print$1.24Print 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 flow: POST /v1/documents to upload, POST /v1/quotes to lock a fixed USDC price for a recipient, then pay the returned per-quote x402 URL to create and mail the piece. Price is fixed per quote.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 1 of 1 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/api.postagent.sh

Recent checks

6 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.17 Oct 2026

All 9 checks

When (UTC)	Result	HTTP	Response
17 Oct, 09:26 UTC	Challenge detected	402	591ms
16 Oct, 11:31 UTC	Challenge detected	402	963ms
14 Oct, 23:56 UTC	Challenge detected	402	918ms
13 Oct, 10:39 UTC	Challenge detected	402	912ms
11 Oct, 10:02 UTC	Challenge detected	402	911ms
10 Oct, 00:46 UTC	Challenge detected	402	1096ms
8 Oct, 21:32 UTC	Challenge detected	402	973ms
7 Oct, 18:39 UTC	Challenge detected	402	866ms
6 Oct, 15:34 UTC	Challenge detected	402	1172ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 17 Oct, 09:26 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for PostAgent?

Its listed price is $1.24.

What payment terms does PostAgent advertise?

The listing advertises x402, Base and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is PostAgent listed?

In x402 Bazaar. Superstables first indexed it on 6 Oct 2026.

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