This is exactly the requested first-party Keryx Engineering article 'How Keryx pays cited creators', with full text (3473 bytes) and a documented revision hash. Its preview explicitly names access tolls, citation rewards, exact-quote evidence checks, contribution weights and settlement limits, which directly map to all three targets: whether paying to read guarantees a citation (0), how the toll differs from a qualified citation reward (1), and what happens to a settled toll when no final citation is supported (2). Already cached, so reuse is free and well within budget. — selected for the claim-aware evidence portfolio (targets claims 1, 2, 3; 0 fetch USDC, 1 attention slot).

Keryx engineering doc on citation rewards whose snippet directly states a paid read does not guarantee a citation reward and separates access toll from citation reward — squarely on targets 0-2; free read of the original page. - free public original-page READ selection (not a cache hit); no purchase or creator reward. — selected for the claim-aware evidence portfolio (targets claims 1, 2, 3; 0 fetch USDC, 1 attention slot).

arXiv rate-limit policy is unrelated to Keryx Engineering's citation-payment article; no target worth investigating. - free public feed reference; no purchase or creator reward.

BIS gold-price research has no bearing on Keryx tolls vs citation rewards. - free public feed reference; no purchase or creator reward.

Open-source AI tool survey is a different subject from Keryx payment mechanics. - free public feed reference; no purchase or creator reward.

Cloudflare module registry engineering post does not address Keryx citation payouts. - free public feed reference; no purchase or creator reward.

CC heritage roundtable touches open access but not Keryx's toll/citation distinction. - free public feed reference; no purchase or creator reward.

Private AI compute memory announcement is unrelated to the requested Keryx article. - free public feed reference; no purchase or creator reward.

DOAJ library-publishing toolkit post concerns OA journals, not Keryx citation rewards. - free public feed reference; no purchase or creator reward.

Docker ecosystem event post is unrelated to Keryx payment policy. - free public feed reference; no purchase or creator reward.

DuckDB view-only database article has no relevance to citation tolls. - free public feed reference; no purchase or creator reward.

RecSys/LLM talk notes do not cover Keryx source-access or citation payments. - free public feed reference; no purchase or creator reward.

Go inliner blog is a different subject entirely. - free public feed reference; no purchase or creator reward.

ToolGrad dataset-generation abstract is unrelated to Keryx payment mechanics. - free public feed reference; no purchase or creator reward.

LLM agent survey does not discuss Keryx tolls or citation rewards. - free public feed reference; no purchase or creator reward.

MSR Asia Singapore lab recap is unrelated to the requested Keryx article. - free public feed reference; no purchase or creator reward.

Netlify/Cursor deployment post has no bearing on citation payment policy. - free public feed reference; no purchase or creator reward.

Ollama decision-model announcement is a different subject. - free public feed reference; no purchase or creator reward.

OpenAI Developers plugin guide does not address Keryx payment flows. - free public feed reference; no purchase or creator reward.

OpenAlex software-citation post is about scholarly credit for code, not Keryx's toll vs qualified citation reward rules. - free public feed reference; no purchase or creator reward.

PostgreSQL Dasha dashboard news is unrelated to the requested targets. - free public feed reference; no purchase or creator reward.

PyTorchCon academic-project post does not cover Keryx citation payouts. - free public feed reference; no purchase or creator reward.

Rust release announcement is a different subject. - free public feed reference; no purchase or creator reward.

MiMo architecture notes are unrelated to Keryx payment policy. - free public feed reference; no purchase or creator reward.

Bayesian A/B testing post has no relevance to citation tolls or rewards. - free public feed reference; no purchase or creator reward.

Stripe OUSD stablecoin post concerns payments generally but not the Keryx Engineering first-party article on tolls vs citation rewards; no target worth investigating. - free public feed reference; no purchase or creator reward.

Supabase product blog about Postgres/MCP servers; unrelated to Keryx citation tolls or rewards. - free public feed reference; no purchase or creator reward.

Tailscale networking/PAM content; no bearing on Keryx access tolls vs citation rewards. - free public feed reference; no purchase or creator reward.

NASA engineering excellence essay; different subject from Keryx payment mechanics. - free public feed reference; no purchase or creator reward.

vLLM disaggregated serving guide; unrelated to Keryx citation economics. - free public feed reference; no purchase or creator reward.

Wikimedia community story about a Baoulé Wikipedia; not about Keryx tolls or citation rewards. - free public feed reference; no purchase or creator reward.

x402 Foundation launch covers the HTTP payment protocol generally, not Keryx's specific toll-vs-citation-reward rules. - free public feed reference; no purchase or creator reward.

Keryx archive answer page explicitly discussing access tolls versus citation rewards with a recorded creator reward; plausibly relevant to targets 0-2, though it is a derived answer rather than the named article. - free public original-page READ selection (not a cache hit); no purchase or creator reward. — the claim-aware portfolio chose a stronger, less redundant set inside the 2-source attention and $0.025000 fetch-budget caps, so this proposal stays unspent.

Keryx PLAN.md is a build roadmap/status file, not the article on tolls vs citation rewards; low chance of answering targets 0-2. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Release-announcement tweet about test counts and a proof dossier; does not document toll-vs-reward rules. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Glama MCP listing describing Keryx's origin and roadmap; no detail on access tolls versus citation rewards. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Keryx homepage describing the decide/cite/settle flow and creator access pricing; may clarify the toll-vs-reward distinction for targets 0-2, though it is marketing rather than the named article. - free public original-page READ selection (not a cache hit); no purchase or creator reward. — the claim-aware portfolio chose a stronger, less redundant set inside the 2-source attention and $0.025000 fetch-budget caps, so this proposal stays unspent.

Third-party YouTube overview of Keryx paying per citation; not the first-party article and unlikely to state the toll/reward rules precisely. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Personal portfolio page summarizing Keryx; no substantive treatment of access tolls versus citation rewards. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

LinkedIn post on Keryx buying sources; brief promotional framing, not the documented article on tolls vs rewards. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Retraction Watch piece on a journal paying cash for citations; different subject from Keryx mechanics. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Generic influencer compensation methods article; unrelated to Keryx tolls or citation rewards. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Facebook discussion about paying for academic citations; different subject and no Keryx documentation. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Creator-hub marketing page about writing payouts; unrelated to Keryx access tolls vs citation rewards. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Influencer invoicing/tax payout process article; different subject from Keryx citation economics. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Short video about content creation as a paid skill; no relevance to Keryx tolls or rewards. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Medium listicle on paid book reviewing; unrelated to Keryx payment mechanics. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Publisher-side AI citation revenue overview; generic and not the Keryx first-party article on tolls vs citation rewards. - free public original-page READ selection (not a cache hit); no purchase or creator reward.

Release notes for Keryx v0.27.10 (a client/MCP SDK changelog) do not address how access tolls, citation rewards, or unsettled-toll handling work; the preview covers unrelated research-inspection and security-pin changes. Memory context also shows this first-party release-notes source was read but never cited on this subject. No target is worth investigating here.