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Research Paper & DOI Lookup (Crossref)

MCP server MCP

pcp183 · github.com/pcp183 · Search & Research

not indexed Provider site ↗

Verify a DOI or find papers via Crossref metadata. $0.005/call via x402.

Price — no price published

Calls · 30d — not reported by any source

Buyers · 30d — Observed sending wallets · Base USDC · partial sender history · purchases unverified

Volume · 30d — Observed Base USDC inflows · not attributable or not measured

Inflow growth · 7d — not comparable (baseline under $1 or window incomplete)

Trx · 30d — Observed transfers · not attributable or not measured

Provider

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Observed inflows · last 30 days

No inflow observed in this window

No payout address is published, so nothing can be observed.

Observed inflows by window for Research Paper & DOI Lookup (Crossref).
Window	Observed	Transfers
Last complete day (2026-11-11)	—	—
Last 7 days	—	—
Last 30 days	—	—
Growth, 7d against the 7 before	not comparable

Source: on-chain transfer scan (USDC on Base) Window: 2026-10-13 → 2026-11-11 Scanned: 30/30 days Sample: 0 days with a measurement First seen: never Last update: 2026-11-11

Daily history →. Observed transfers show value arriving at the payout address; they do not establish service revenue.

Competitors & category benchmark

Rank the whole category →

Closest competitors Search & Research

Exa 12,469 calls · 0.007 USDC per call —
Pocket Network 6,805 calls · 0.005 USDC per call $600.20
glim.sh 6,092 calls · 0.005 USDC per call —
Search 4,737 calls · 0.006 USDC per call —
Search 3,122 calls · 0.001 USDC per call —

Sorted by source-measured calls, not by our opinion. The right-hand figure is observed inflow, which stays empty for peers whose address is shared.

Category benchmark 19,723 services in this category

With a measured call count	10,829 (54.9 %)
With a published price	12,390 (62.8 %)
With attributable inflows	126 (0.6 %)
Observed inflows · 30d	$1,533.13
Median measured calls	2
Median price per call	$0.01