AssayChain Mineral Intelligence

On-chain critical mineral intelligence API. Returns USGS commodity benchmarks, mining district profiles, and grounded RAG answers synthesized from 195 EAS-attested files (Base mainnet). Every response includes IPFS CIDs and EAS attestation UIDs for verifiable provenance. Core USGS benchmark and price-snapshot endpoints are free (rate-limited); advanced endpoints use x402 micropayments (from $0.10 USDC per call, Base network) — no API keys required.

Paid verification

How it works

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B+ 68.2 / 100

Availability 20.0 / 20

Endpoint responded (HTTP 200)

Payability 14.0 / 15

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✗ Price declared

Demand 12.2 / 35

6 distinct payers, 488 USDC transfers in the last 30 days; discounted because most transfers come from few payers

Performance 10.0 / 10

Last probe answered in 94 ms (full marks at 200 ms or less)

Readiness 12.0 / 15

Agent readiness 80/100

Owner verified 0.0 / 5

Nobody has claimed this listing yet

Endpoint last checked 18 h ago. On-chain activity last read 3 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

B · 80/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B+, 68.2/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements	9/10	Findings: missing: price declared. missing: price declared
Live 402 challenge	20/25	Endpoint reachable; its 402 challenge was seen earlier (94 ms).
x402 version	n/a	x402 version not observed yet.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	32/32 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 12 paid resource(s).
Verified identity	5/10	Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags	1/5	not seen in a source for over 30 days; declares x402.
Security declaration	n/a	Payment is the access control for an x402 resource.

Applicable criteria total 75 points, scaled to 100.

Responsiveness: Responsive (94 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest. Qualifies the payment claim; adds no points.

Measured 2026-11-11.

Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

Compared with peers

Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.

Readiness: Higher than 55% of peers; This listing 80 · peer median 78
Latency: Faster than 90% of peers; This listing 94 ms · peer median 205 ms

Where it loses the most points, and how to win them back

Live 402 challenge −5 — Answer the paid path with a valid 402 challenge.
Now: Endpoint reachable; its 402 challenge was seen earlier (94 ms).
Verified identity −5 — Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags −4 — Keep the listing current in the registry or source it comes from.
Now: not seen in a source for over 30 days; declares x402.

How many agent tools actually work · All statistics

Paid endpoints

12 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

GET https://assaychain.com/api/benchmark/gold

USGS gold benchmark: mine production by country, reserves, pricing history, CO2e per tonne, EAS attestation UID on Base.

GET https://assaychain.com/api/benchmark/silver

USGS silver benchmark: industrial demand breakdown, mine output by country, reserves, EAS attestation UID.

GET https://assaychain.com/api/benchmark/copper

USGS copper benchmark: energy-transition demand projections, mine production by country, reserves, EAS attestation UID.

GET https://assaychain.com/api/benchmark/lithium

USGS lithium benchmark: EV battery demand, hard-rock vs brine supply breakdown, reserves by country, EAS attestation UID.

GET https://assaychain.com/api/benchmark/cobalt

USGS cobalt benchmark: DRC supply share, battery vs superalloy demand split, reserves by country, EAS attestation UID.

GET https://assaychain.com/api/benchmark/nickel

USGS nickel benchmark: Indonesian supply dominance, sulfide vs laterite ore split, reserves by country, EAS attestation UID.

GET https://assaychain.com/api/benchmark/manganese

USGS manganese benchmark: steelmaking vs LMFP battery demand split, reserves by country, EAS attestation UID.

GET https://assaychain.com/api/benchmark/graphite

USGS graphite benchmark: natural vs synthetic anode share, China supply concentration, reserves by country, EAS attestation UID.

GET https://assaychain.com/api/price-snapshot/copper

Daily market context bundle for any of the 20 critical minerals: spot price, Baltic Dry Index, WTI, EUR/USD FX rate, LME stock. Free (rate-limited); attested in weekly batches.

GET https://assaychain.com/api/benchmark/research/mineral-processing/thixotropic-elutriation-v1

First-party empirical run logs from active field season: tray geometry, feed weight, yield, concentrate grade, ultrasound settings, phase. IPFS-pinned, EAS-attested on Base.

POST https://assaychain.com/api/extract/run

Structured mineral assay extraction from PDF, image, or CSV. AI-powered extraction. Dynamic pricing based on page count.

GET https://assaychain.com/api/health

API status, version, uptime. Free.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://assaychain.com/api  # expect HTTP 402 Payment Required (price advertised in the 402 response)

/.well-known/x402.json

https://assaychain.com/.well-known/x402

Listed in

Directories this entry was found in.

a2a since 2026-10-03