Discover / paper-lookup-production-56b0.up.railway.app

paper-lookup-production-56b0.up.railway.app

■ Challenge detected

Scholarly works metadata from Crossref (150M+ records): resolve a DOI, or search by keywords, author or title with year and type filters. Returns title, authors with ORCID, journal or publisher, publication date, type, ISSN/ISBN, citation count, references count, licence and full-text links, funders. Abstracts are excluded. Use when an agent must verify a citation or DOI, find papers on a topic, or get a paper's authors, journal, date, citation count and links.

x402
Base
USDC

Listed price: $0.005
Challenge detected: 1 of the last check
Median response: 144 ms
Last checked: 16 Oct, 21:16 UTC
In our index since: 16 Oct 2026

Endpoint

curl -i https://paper-lookup-production-56b0.up.railway.app/v1/papers/search
# 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.

GEThttps://paper-lookup-production-56b0.up.railway.app/v1/papers/search$0.005Scholarly works metadata from Crossref (150M+ records): resolve a DOI, or search by keywords, author or title with year and type filters. Returns title, authors with ORCID, journal or publisher, publication date, type, ISSN/ISBN, citation count, references count, licence and full-text links, funders. Abstracts are excluded. Use when an agent must verify a citation or DOI, find papers on a topic, or get a paper's authors, journal, date, citation count and links.

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/paper-lookup-production-56b0.up.railway.app

Recent checks

16 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.16 Oct 2026

All 1 checks

When (UTC)	Result	HTTP	Response
16 Oct, 21:16 UTC	Challenge detected	402	144ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 21:16 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 paper-lookup-production-56b0.up.railway.app?

Its listed price is $0.005.

What payment terms does paper-lookup-production-56b0.up.railway.app 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 paper-lookup-production-56b0.up.railway.app listed?

In x402 Bazaar. Superstables first indexed it on 16 Oct 2026.

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