Add AgentPay Web Extract

[noah-silver]

Adds one service entry to directory/apis.md (## Web & Geospatial).

The 402 lives at the endpoint itself (unpaid GET returns an x402 v2 PAYMENT-REQUIRED challenge, Base eip155:8453 and Algorand), and at the /.well-known/x402 manifest linked in the entry.

Example:

GET https://agentpay-extract.agentpay-apis.workers.dev/extract/v1/page?url=https://example.com

Docs: https://github.com/noah-silver/agentpay

[github-actions]

Gold-402 Verification: PASSED

URL checked: https://agentpay-extract.agentpay-apis.workers.dev/extract/v1/page?url=https://example.com (first url that is not a package, repo or social link)
Rule applied: service -- must answer HTTP 402
Result: endpoint returned HTTP 402 -- x402 compliant

This PR has been approved for merge. A maintainer will review and merge shortly.

---

Verified by Gold-402. Verification confirms x402 technical compliance only. It does not constitute endorsement of the service.

[github-actions]

Gold-402 Verification: PASSED

URL checked: https://agentpay-extract.agentpay-apis.workers.dev/extract/v1/page?url=https://example.com (first url that is not a package, repo or social link)
Rule applied: service -- must answer HTTP 402
Result: endpoint returned HTTP 402 -- x402 compliant

This PR has been approved for merge. A maintainer will review and merge shortly.

---

Verified by Gold-402. Verification confirms x402 technical compliance only. It does not constitute endorsement of the service.

[Haustorium12]

Knocked live 2026-10-04: GET /extract/v1/page → 402, x402 v2 exact, $0.005 USDC on Base with Algorand alongside. Merging as written. One question for all three of your AgentPay PRs: our shelf already has several entries named "AgentPay …" (Summarize, Token Safety, Insurance Lead Analysis). Are those related to yours? If not, a distinguishing name would help readers.