Assay

Every paid API on Algorand, tested rather than listed.

861 x402 endpoints from 39 merchants across 46 hosts — each one called on a schedule to check it answers, that its 402 challenge parses, and that it charges what it advertises.

Endpoints live
773
Open defects
85
Overcharging
8
Paid calls
28,684
Last sweep
19h ago · 100% covered
Buyer reviews
none yet
8 endpoints charge more than they advertiseworst: api.micropay.website/api/v1/images/generations lists $0.01, demands $0.50 (50×)

17 merchants · 769 endpoints · 85 with an open defect, listed below each merchant

api.syraa.fun

Markets & trading12 endpoints2 hosts1 loopback host

Cross-asset market pulse with latest Pyth oracle prices for SOL/USD, BTC/USD, and ETH/USD including confidence intervals and publish times. Use when an agent needs a quick multi-asset price snapshot from authoritative feeds

50%live16,858paid calls15payers
  • Unreachable host/insights/defi-tvlthe host did not answer
  • Unreachable host/insights/gas-oraclethe host did not answer
  • Unreachable host/insights/market-pulsethe host did not answer
  • Unreachable host/insights/network-healththe host did not answer
  • Unreachable host/insights/token-metricsthe host did not answer
  • Unreachable host/insights/volatility-indexthe host did not answer
$0.0005 – $0.10
USDC
Degraded6 of 12 failing · 19h ago

agent402.tools

Utilities514 endpoints

Cryptographic hash of a text string. Algorithms: sha256 (default), sha512, sha1, md5. Returns hex and base64 digests

98%live2,089paid calls4payers
  • Pays elsewhere/api/route/executethe 402 asks for W4GZHN36…B67UOE, not the listed payout address
  • Pays elsewhere/api/route/execute-maxthe 402 asks for W4GZHN36…B67UOE, not the listed payout address
  • Price mismatch/api/answerlisted $0.03 · charges $0.08 (2.7×)
  • Price mismatch/api/skill/article-digestlisted $0.08 · charges $0.10 (1.3×)
  • Price mismatch/api/skill/company-dossierlisted $0.50 · charges $0.12
  • Price mismatch/api/skill/crypto-dossierlisted $0.30 · charges $0.12
  • Price mismatch/api/skill/domain-intellisted $0.25 · charges $0.075
  • Price mismatch/api/stock-quotelisted $0.01 · charges $0.003
$0.001 – $1.50
USDC
Pays elsewhere2 rerouted · 19h ago2 above list8 of 514 failing

127.0.0.1:4021

Chain data133 endpoints2 hosts1 loopback host

Algorand Foundation–related holder wallets snapshot for ALGO (full list in one response; not paged)

69%live230paid calls2payers
  • Unreachable host/x402/algo/nodesthe host did not answer
  • Unreachable host/x402/asa/0/activitythe host did not answer
  • Unreachable host/x402/asa/0/top-holdersthe host did not answer
  • Unreachable host/x402/asa/0/top-holders-previouslythe host did not answer
  • Price mismatch/x402/algo/foundation-total-historylisted $0.02 · charges $0.10 (5.0×)
  • Price mismatch/x402/algo/nodes-historylisted $0.02 · charges $0.10 (5.0×)
  • No schema published/x402/algo/nodes-bucket-historyno input or output schema in the listing
  • No schema published/x402/algo/nodes-wallet-historyno input or output schema in the listing
  • No schema published/x402/app-unique-sendersno input or output schema in the listing
  • No schema published/x402/asa/0/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1138500612/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/1138500612/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1138500612/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1284444444/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/1284444444/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1284444444/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2200000000/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/2200000000/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2200000000/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2726252423/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/2726252423/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2726252423/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2994233666/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/2994233666/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2994233666/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3160000000/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/3160000000/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3160000000/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3203964481/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/3203964481/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3203964481/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/393537671/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/393537671/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/393537671/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/700965019/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/700965019/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/gora/validator-stake-historyno input or output schema in the listing
  • No schema published/x402/gora/wallet-stake-historyno input or output schema in the listing
  • No schema published/x402/hay/wallet-stake-historyno input or output schema in the listing
  • No schema published/x402/tinyman/wallet-stake-historyno input or output schema in the listing
$0.01 – $0.50
USDC
Overcharges2 above list · 19h ago40 of 133 failing

head-hive.fly.dev

Utilities6 endpoints

Quick Answer — Single expert agent answers a question directly. Cheapest tier, no team fan-out

0%live207paid calls2payers
  • No 402 challenge/api/analyzeanswered without a 402 challenge
  • No 402 challenge/api/askanswered without a 402 challenge
  • No 402 challenge/api/extractanswered without a 402 challenge
  • No 402 challenge/api/memory/recallanswered without a 402 challenge
  • No 402 challenge/api/memory/storeanswered without a 402 challenge
  • No 402 challenge/api/plananswered without a 402 challenge
$0.002 – $0.10
USDC
Broken6 of 6 failing · 19h ago

api.scrape402.site

Chain data2 endpoints2 hosts1 loopback host

Extract clean, markdown-formatted text from any given URL, bypassing common web blocks

50%live176paid calls172payers
  • Unreachable host/scrapethe host did not answer
$0.10
USDC
Degraded1 of 2 failing · 19h ago

LN745UCD…PZN3YY

Markets & trading1 endpoint

Key findings summary for Pacific Tuna Stock Assessment — PDC Demo (Synthetic). Returns stock status by species, coverage statistics, and 3 key findings. SYNTHETIC DEMO DATA

0%live101paid calls1payer
  • Unreachable hostnull/summarythe host did not answer
$0.01
USDC
Broken1 of 1 failing · 19h ago

algo.netintel.dev

Chain data73 endpoints

DNS lookup / nslookup / dig API — resolve the common DNS record types (A, AAAA, MX, TXT, NS, CNAME, SOA, PTR) for a domain. Parses SPF/DMARC from TXT plus DKIM at the default._domainkey selector, and cross-checks A records across Google/Cloudflare/Quad9 resolvers for propagation consistency

97%live76paid calls1payer
  • Price mismatch/schema-parse/extractlisted $0.10 · charges $0.05
  • Price mismatch/sentiment/analyzelisted $0.03 · charges $0.002
$0.002 – $0.25
USDC
Degraded2 of 73 failing · 19h ago

dashboard.frynetworks.com

Chain data2 endpoints2 hosts

Live Fry Networks DePIN device-staking pool telemetry (aggregated)

50%live67paid calls20payers
  • No 402 challenge/x402/depin/my-devicesanswered without a 402 challenge
$0.005 – $0.01
USDC
Degraded1 of 2 failing · 19h ago

api.micropay.website

AI & inference7 endpoints4 hosts

OpenAI-compatible chat completion from qwen3.6-plus, returning assistant messages with optional SSE token streaming

0%live39paid calls3payers
  • Price mismatch/api/v1/chat/completionslisted $0.01 · charges $0.10 (10×)
  • Price mismatch/api/v1/images/generationslisted $0.01 · charges $0.50 (50×)
  • Rejected the call/api/v1/chat/completionsrefused the request outright
  • Rejected the call/api/v1/ide/agentrefused the request outright
  • Rejected the call/api/v1/chat/completionsrefused the request outright
  • Rejected the call/api/v1/ide/agentrefused the request outright
  • Rejected the call/api/v1/images/generationsrefused the request outright
$0.01 – $0.10
USDC
Broken7 of 7 failing · 19h ago2 above list

Upload one file as a Base64-encoded JSON payload

0%live34paid calls1payer
  • Rejected the call/api/v1/pinrefused the request outright
  • Rejected the call/api/v1/pinrefused the request outright
$0.010328
USDC
Broken2 of 2 failing · 19h ago

second-opinion-production.up.railway.app

Utilities8 endpoints2 hosts

Second Opinion quick: an independent reasoning-only check (no web research) of your claim's logic and consistency with established knowledge. Honest 'inconclusive' when the claim needs live research

37%live23paid calls3payers
  • Price mismatch/v1/verifylisted $0.05 · charges $0.20 (4.0×)
  • Price mismatch/v1/verify/gptlisted $0.25 · charges $0.20
  • Price mismatch/v1/verify/panellisted $0.25 · charges $0.75 (3.0×)
  • Price mismatch/v1/verify/quicklisted $0.05 · charges $0.03
  • Rejected the call/v1/verifyrefused the request outright
$0.03 – $0.25
USDC
Broken5 of 8 failing · 19h ago2 above list

civitas-api.civitasv.workers.dev

Chain data2 endpoints2 hosts1 loopback host

Send an end-to-end encrypted message on Algorand: returns the unsigned 0-ALGO payment transaction whose note carries the sealed ciphertext, for the sender to sign and submit

50%live19paid calls2payers
  • Unreachable host/x402-empty-config-probethe host did not answer
$0.01 – $0.10
USDC
Degraded1 of 2 failing · 19h ago

Consensa clearance: consented, attributed use of OSS knowledge

0%live15paid calls2payers
  • Rejected the call/v1/clearancerefused the request outright
$0.01
USDC
Broken1 of 1 failing · 19h ago

localhost:3000

Markets & trading3 endpoints2 hosts1 loopback host

Minimal paid health check confirming Syra API is up and x402 settlement works. Use when an agent or monitor verifies connectivity before batch calls. No inputs. Returns ok, status, service, message, timestamp

0%live6paid calls3payers
  • Unreachable host/newsthe host did not answer
$0.0001 – $0.005
USDC
Broken1 of 3 failing · 19h ago

localhost:4022

Chain data1 endpointloopback host — unreachable from the internet

Extract clean, markdown-formatted text from any given URL, bypassing common web blocks

0%live3paid calls3payers
  • Unreachable host/scrapethe host did not answer
$0.10
USDC
Broken1 of 1 failing · 19h ago

nexus-zero.xyz

Security & risk1 endpoint

Fast pre-trade safety gate: verdict, risk score, safeToTrade boolean, and kill-flags (rugged, honeypot, malicious creator/hook, mint/freeze authority)

0%live1paid calls1payer
  • Unreachable host/v1/safetythe host did not answer
$0.005
USDC
Broken1 of 1 failing · 19h ago

localhost:3002

Markets & trading1 endpointloopback host — unreachable from the internet

A cryptographically-signed, on-chain-anchored Peter Lynch decision proof for a stock (?symbol=AAPL)

0%live1paid calls1payer
  • Unreachable host/v1/proofthe host did not answer
$0.01
USDC
Broken1 of 1 failing · 19h ago